The financial ratios of Rolls Royce and its major competitors Essay

The financial ratios of Rolls Royce and its major competitors - Essay Example According to the research findings every business, no matter small or large, constantly evaluates its company’s performance by comparing it with competitors, industry and its own past performance. In order to do so, businesses not only look at the figures of sales, profit and costs but also prepare other criterion for measuring performance which helps in reading between the lines of financial statements. The most widely known and reliable approach of evaluating a firm’s performance is by calculating and comparing its financial ratios. The basic reason for doing so is because this information is understandable for every person who has some level of knowledge of financial concepts. By comparing the ratios with the competitor of the firm or with its past performance, a clear idea can be obtained. For this purpose, the company which has been chosen is Roll Royce. It is a diversified company having its operations in the field of aerospace, nuclear market, civil defense and m arine and energy. It was founded in 1971 and has its headquarters in London, United Kingdom. Activity Ratio also called as Liquidity Ratio helps a firm in determining the ability of a firm to meet its current liabilities. Activity Ratio is that investment or cash which is used to pay off the short term debts as well as expenses. Current Ratio is determines whether the firm has enough liquidity to pay off its expenses and short term debt. Theoretically, if current ratio is around 2.00 then it is considered as the most preferable. This ratio possesses huge consideration because if this ratio is declining it means that the cash position of the company is getting eroded. For that reason, the quickest way which can increase cash is increasing the amount of sales. Quick Ratio This ratio is also known as Acid Test Ratio. This ratio determines that if inventories are excluded, then is the firm able to pay off its short term expenses? Quick ratio is usually preferable if it is 1 or near to 1 . If this number is decreasing, then it means that enough sales are not being generated to pay off the short term debt or day to day expenses. In order to improve such situation, intervention regarding Quick Cash Management is required. Net Working Capital to Sales This ratio determines the company’s performance in relation to its sales, after meeting the short term obligations or liabilities, Efficiency Ratio Efficiency ratio determines the efficiency of a business or in other words, how well the business operations are conducted. These ratios determine how well and quickly the company collects its accounts receivables, how quickly the inventory moves and how much sales are generated by the company’s assets. Efficiency ratios include: Inventory Turnover Receivable Turnover Payable Turnover Days Inventory in hand Debtors Collection Period Creditors Payment Period Inventory Turnover Inventory turnover ratio determines the total turnovers of inventory. This ratio determi nes the efficiency of inventory management. If inventory turnover ratio is higher, then it means that firm is really efficient in rolling over its inventory. However, in some cases high inventory turnover ratio also means that firm doesn’t have enough inventories on its hand and therefore losing its sales.

Activation Of T Lymphocytes Essay Example for Free

Activation Of T Lymphocytes Essay Different types of T lymphocytes exist and each type performs a specialized function.   Helper T cells, also known as TH cells, serve as messengers of the immune system.   When helper T cells are activated, these cells proliferate and produce cytokines, which are small proteins that control the extent of immune response that a biological organism will express.   Several types of cytokines exist and each cytokine triggers the maturation of helper T cells into specific subtypes such as helper T cell subtype 1, 2 and 17 (Balandina et al. , 2005). Another type of T lymphocyte is the cytotoxic T cell (CTL), which is also known as the TC cell.   Cytotoxic T cells are responsible for the destruction of cells that were infected by viruses, as well as for the annihilation of tumor cells.   These cells also play a major role in determining whether a cell is normally part of the system or a foreign cell.   Cytotoxic T cells are known to be the first in line to react and reject if an organ transplanted into a recipient is not compatible in terms of tissue compatibility. The cytotoxic T cells that are associated with tissue rejection are designated at CD8+ T cells, based on the idea that these cytotoxic T cells produce a specific CD8 glycoprotein that is displayed on its cell membrane.   These CD8 glycoproteins interact with helper T lymphocytes, of which may trigger its transformation into regulatory T cells.   The major role of regulatory T cells is to inhibit the onset of an autoimmune disorder within the system of the organism. Another type of T lymphocyte is the memory T cell which is produced as soon as an infection occurs in an individual.   These specific T cells continue to circulate in the blood system for several months even when the infection has been stopped.   Memory T cells further differentiate into effector T cells when they find the same antigen that was associated with the previous infection, hence the term memory is appropriate to apply to this type of function.   Two general types of memory T cells include the central and effector cells.  Ã‚   Memory T cells are known to carry either the CD4 or the CD8 glycoprotein on its plasma membrane (Wildin et al., 2001). Regulatory T cells are another type of T lymphocytes that play a crucial role in sustaining the tolerance of the immune system (Khattri et al., 2003).   These T cells were earlier called suppressor T cells and their primary role is to prevent immunity that is caused by other T cells during the later stages of an immune response (Fontenot et al., 2003).   Regulatory T cells are also responsible for inhibiting the immune reaction towards other cells of the body or self cells because this is important in maintaining the stability of the entire immunological system. Specific conditions result in the immune response towards self cells and this is usually observed when the thymus experiences difficulty in distinguishing self cells from non-self or foreign cells.   There are two major types of CD4+ regulatory T cells that have been characterized.   Naturally occurring regulatory T cells originate from the thymus and are sometimes referred to as CD4/CD25/ForP3 T regulatory cells. The other major type of CD4+ regulatory T cell is the adaptive T regulatory cell which is produced when an innate immune response occurs.   This type of cell is also called Tr1 or Th3 cell (Hori et al., 2003).   A distinguishing feature that facilitates is the differentiation of naturally occurring T regulatory cells from the rest of types of T lymphocytes is the occurrence of the FoxP3 molecule that is situated within the cytoplasm.   Research has shown that mutations incurred in the FOXP3 gene results in the inability of regulatory T cells to differentiate, which in turn influences the onset of the lethal condition of autoimmunity. Another type of T lymphocyte is the natural killer T cell which is serves as the communicator between the adaptive and the innate immune systems.   Different from the standard T lymphocyte that identifies protein antigens that are harbored by the major histocompatibility complex (MHC), the natural killer T lymphocytes distinguish glycolipid antigens that are shown by the protein molecule CD1d.   The natural killer T lymphocyte is then activated and subsequently acquires the ability to execute specific functions that are related to Th and Tc cells, including the secretion of cytokines and the expression of cytolytic molecules that are responsible for the destruction of foreign cells that have invaded the body. Gamma-delta T lymphocytes represent a small subtype of T cells that carry a unique receptor on their plasma membrane.   Most of the T lymphocytes carry a receptor that is comprised by two strings of alpha and beta glycoproteins.   In gamma-delta T lymphocytes, the receptor is composed of a gamma and a delta glycoprotein string.   Gamma-delta T lymphocytes are quite rare, comprising only approximately 5% of the entire T lymphocyte population but are found in high concentrations in the epithelial lining of the stomach, as part of population of intraepithelial lymphocytes. Protein antigens that trigger a response from gamma-delta T cells have still yet to be determined.   It is interesting to know that gamma-delta T lymphocytes are not exclusively assigned to carry major histocompatibility complex molecules and are actually capable of identifying entire proteins than simply perceiving short protein chains carried by the major histocompatibility complex molecules on lymphocytes that harbor antigens. There are particular gamma-delta T cells that have the capacity to identify a specific type of major histocompatibility complex molecules, specifically class IB.   In the human immune system, the Vgamma9/Vdelta2 T lymphocyte makes up the majority of the gamma-delta T lymphocyte population that is circulating in the bloodstream.   These specific T lymphocytes have the function of quickly reacting to a tiny metabolite that originates from microorganisms, known as the isopentenyl pyrophosphate precursor.   Another type of T lymphocyte is the autoaggressive T cell which is highly specialized based on its ability to secrete the CD40 protein molecule (Miura et al., 2004).   CD40 is generally linked to T lymphocytes that present fragments of an antigen and this protein molecule is commonly produced by a subtype of T helper lymphocytes. Th40 cells are present in all human beings but the levels of this specific type of cells quickly increase during conditions of autoimmunity.   In patients diagnosed with type 1 diabetes mellitus, the Th40 cells usually react to self-antigens.   In the case of patients diagnosed with non-autoimmune individuals, the Th40 lymphocytes do not react with these antigens.   An important function of the CD40 protein molecule on T lymphocytes is to trigger the recombinase proteins RAG1 and RAG2 in directing the receptor of a T lymphocyte. The receptor of a T lymphocyte serves as the route through which a T lymphocyte is able to identify a specific antigen.   It has been determined that the two recombinase proteins be produced exclusively in the thymus during the development of T lymphocytes.   It was, however, observed that the RAG proteins were secreted again by the T lymphocytes that were circulating in the bloodstream.   In addition, it was also observed that the CD40 protein associated with Th40 lymphocytes, resulting in the production of RAG proteins.   Subsequent to the expression of the RAG proteins, modifications in the receptor of the T cells take place, suggesting that the Th40 lymphocytes carry the ability to adapt for the entire duration of an individual’s life. The procedure of modifying the expression of the receptors of T cells that are circulating in the bloodstream has been names as TDR revision.   Research has reported that TCR revision influences the expansion of the repertoire of T lymphocytes, as well as generates T lymphocytes that are autoaggressive.   This observation therefore shows that the revision of the receptors of T cells is another method of T lymphocyte tolerance. THE DEVELOPMENT OF T LYMPHOCYTES IN THE THYMUS T lymphocytes are developed from the stem cells of the hematopoietic system which is located in the bone marrow.   These stem cells migrate from the bone marrow to the thymus, where they are expected to proliferate through the process of cell division and generate immature thymocytes.   Young thymocytes generally do not secrete any CD4 or CD8 proteins hence these cells have been described as CD4-CD8- cells. During their course of development, the young thymocytes acquire the capability of secreting CD4 and CD8 molecules and these thymocytes are now classified as CD4+CD8+ (Sakaguchi, 2000).   Further maturation of these cells involves the specific secretion of only one protein, either the CD4 or the CD8 molecule.   Once this has been determined in each thymocytes, these cells are then expelled by the thymus in order for them to circulate to the rest of the body.   Approximately 98% of the thymocytes produced by the thymus are expected to disintegrate during its maturation, resulting in only 2% of the thymocytes reaching maturity and categorically expelled by the thymus as immunocompetent T lymphocytes. Immature thymocytes that harbor the two types of antigens, CD4 and CD8, migrate into the core of the thymus in order to associate with antigens that are generated by the T lymphocyte.   These thymocytes interact with the major histocompatibility complex molecules that are present of the plasma membrane of the cells of the epithelium.   Only a specific fraction of thymocytes will be able to completely bind with the major histocompatibility complex molecules thus resulting in a signal that indicates the survival of the thymocyte. The rest of the thymocytes that were not able to achieve a complete association with the major histocompatibility complex molecules are thus classified as incapable of performing immune functions or even illicit an immune response.   This specific group of thymocytes thus undergoes the process of apoptosis, which involved the disintegration of the nucleus which eventually leads to cell death.   The cellular debris that results from the apoptotic pathway are enveloped and eaten by macrophages.   The entire process of differentiating immuno-competent from immuno-incompetent thymocytes based on the ability to illicit an immune reaction is known as positive selection. Thymocytes that endure positive selection travel towards the perimeter of the cortical and middle regions of the thymus. While situated in the middle region of the thymus, the thymocytes are presented with an antigen of its self in association with the major histocompatibility complex molecules on antigen-presenting cells (APCs), including the dendritic cells and macrophages.   Thymocytes that intensely associate with the antigen are sent a signal that induces their programmed death and the rest of the thymocytes that were first generated are trigger to disintegrate during this selection process in the thymus. A small fraction of the cells that survived is induced to develop regulatory T cells.   The other cells subsequently depart the thymus as differentiation naive T lymphocytes.   This mechanism is designated as negative selection, an essential process of immunological tolerance that controls the development of T lymphocytes that react to self cells and are able of to cause an autoimmune disease in the body of an individual (Shevach, 2000). Although the specific mechanisms of activation vary slightly between different types of T cells, the two-signal model in CD4+ T cells holds true for most. Activation of CD4+ T cells occurs through the engagement of both the T cell receptor and CD28 on the T cell by the Major histocompatibility complex peptide and B7 family members on the APC respectively. Both are required for production of an effective immune response; in the absence of CD28 co-stimulation, T cell receptor signalling alone results in anergy. The signalling pathways downstream from both CD28 and the T cell receptor involve many proteins. The first signal is provided by binding of the T cell receptor to a short peptide presented by the major histocompatibility complex (MHC) on another cell. This ensures that only a T cell with a TCR specific to that peptide is activated. The partner cell is usually a professional antigen presenting cell (APC), usually a dendritic cell in the case of naà ¯ve responses, although B cells and macrophages can be important APCs. The peptides presented to CD8+ T cells by MHC class I molecules are 8-9 amino acids in length; the peptides presented to CD4+ cells by MHC class II molecules are longer, as the ends of the binding cleft of the MHC class II molecule are open. The second signal comes from co-stimulation, in which surface receptors on the APC are induced by a relatively small number of stimuli, usually products of pathogens, but sometimes breakdown products of cells, such as necrotic-bodies or heat-shock proteins (Brunkow et al., 2001). The only co-stimulatory receptor expressed constitutively by naà ¯ve T cells is CD28, so co-stimulation for these cells comes from the CD80 and CD86 proteins on the APC. Other receptors are expressed upon activation of the T cell, such as OX40 and ICOS, but these largely depend upon CD28 for their expression. The second signal licenses the T cell to respond to an antigen. Without it, the T cell becomes anergic and it becomes more difficult for it to activate in future. This mechanism prevents inappropriate responses to self, as self-peptides will not usually be presented with suitable co-stimulation. The T cell receptor exists as a complex of several proteins. The actual T cell receptor is composed of two separate peptide chains which are produced from the independent T cell receptor alpha and beta (TCR? and TCR?) genes. The other proteins in the complex are the CD3 proteins; CD3 and CD3 heterodimers and most importantly a CD3? homodimer which has a total of six ITAM motifs. The ITAM motifs on the CD3? can be phosphorylated by Lck and in turn recruit ZAP-70. Lck and/or ZAP-70 can also phosphorylate the tyrosines on many other molecules, not least CD28, Trim, LAT and SLP-76, which allows the aggregation of signalling complexes around these proteins. Phosphorylated LAT recruits SLP-76 to the membrane, where it can then bring in PLC?, VAV1, Itk and potentially PI3K. Both PLC? and PI3K act on PI(4,5)P2 on the inner leaflet of the membrane to create the active intermediaries di-acyl glycerol (DAG), inositol-1,4,5-trisphosphate (IP3) and phosphatidlyinositol-3,4,5-trisphosphate (PIP3). DAG binds and activates some PKCs, most importantly in T cells PKC?, which is important for activating the transcription factors NF-?B and AP-1. IP3 is released from the membrane by PLC? and diffuses rapidly to activate receptors on the ER which induce the release of calcium. The released calcium then activates calcineurin, and calcineurin activates NFAT, which then translocates to the nucleus. NFAT is a transcription factor which activates the transcription of a pleiotropic set of genes, most notably IL-2, a cytokine which promotes long term proliferation of activated T cells. Overview of interactions between T cells and APCs T cells are a subset of lymphocytes that play a large role in the cell-mediated immune response of adaptive immunity. T lymphocytes are divided into 2 major classes distinguished by the expression of the cell surface molecules CD4 or CD8. CD8 cytotoxic T lymphocytes (CTLs) primarily destroy virus-infected cells whereasCD4 helper T lymphocytes are involved in activating B cells and macrophages. The response of both classes of T lymphocytes is dependent on interactions through the T cell receptor (TCR) and coreceptors (CD4 or CD8) with target APCs that present peptides in the context of MHC class I or class II molecules. MHC class I and class II molecules are structurally similar but differ in their source of antigenic peptide and in the transport mechanisms for their peptides. Class I MHC molecules present self peptides or viral products from the cytosol to CD8 T lymphocytes, whereas MHC class II molecules present peptides from pathogens that either reside or were endocytosed into intracellular compartments (Fontenot and Rudensky, 2005). T cells are activated on encountering antigen, which results in either lysis of target cells by CD8 T lymphocytes or recruitment of other effector cells by CD4 cells.   Modulation of the plasma membrane alters the T cell Ca2+ response.   A series of studies from showedthat unsaturated free fatty acids (FFAs) could inhibit specific aspects of cytotoxic T cell function by perturbing membranes.   Initially, it was shown that short-term exposure of murine allogeneic effector T cells to low levels of unsaturated FFAs (10 mol/L), including PUFAs, inhibited lysis of target APCs. The change in lysis of target cells was a direct consequence of the FFA added to the CTLs, because lysis could be inhibited by extracting the unsaturated FFA with bovine serum albumin before CTL-target conjugation. Specific aspects of T cell function inhibited by unsaturated lipids included the initial rise in intracellular [Ca2+] on conjugate formation, protein phosphorylation events and subsequent CTL esterase release.   On the other hand, release of inositol phosphates and binding to target cells were unaffected. Because the inhibition in CTL calcium release linearly correlated with the decrease in membrane acyl chain order induced by the presence of increasing unsaturation in the plasma membrane , it was hypothesized that modulation of membrane structure affected T cell Ca2+ signaling. References Balandina A, Lecart S, Dartevelle P, Saoudi A and Berrih-Aknin S (2005):   Functional defect of regulatory CD4( )CD25 T cells in the thymus of patients with autoimmune myasthenia gravis. Blood   105:735–741. Brunkow ME, Jeffery EW, Hjerrild KA, Paeper B, Clark LB, Yasayko SA, Wilkinson JE, Galas D, Ziegler SF and Ramsdell F (2001):   Disruption of a new forkhead/winged-helix protein, scurfin, results in the fatal lymphoproliferative disorder of the scurfy mouse. Nat. Genet.   27:68–73. Fontenot JD, Gavin MA and Rudensky AY (2003):   Foxp3 programs the development and function of CD4-CD25 regulatory T cells. Nat. Immunol.   4:330–336. Fontenot JD and Rudensky AY (2005):   A well adapted regulatory contrivance:   Regulatory T cell development and the forkhead family transcription factor Foxp3. Nat. Immunol. 6:331–337. Hori S, Nomura T and Sakaguchi S (2003):   Control of regulatory T cell development by the transcription factor Foxp3. Science 299:1057–1061 Khattri R, Cox T, Yasayko SA and Ramsdell F (2003):   An essential role for Scurfin in CD4-CD25 T regulatory cells. Nat. Immunol.   4:337–342. Miura Y, Thoburn CJ, Bright EC, Phelps ML, Shin T, Matsui EC, Matsui WH, Arai S, Fuchs EJ and Vogelsang GB (2004):   Association of Foxp3 regulatory gene expression with graft-versus-host disease. Blood   104:2187–2193. Sakaguchi S (2000):   Regulatory T cells: key controllers of immunologic self-tolerance.   Cell 101:455–458. Shevach EM (2000): Regulatory T cells in autoimmmunity. Annu. Rev. Immunol.   18:423–449. Wildin RS, Ramsdell F, Peake J, Faravelli F, Casanova JL, Buist N, Levy-Lahad E, Mazzella M, Goulet O and Perroni L (2001): X-linked neonatal diabetes mellitus, enteropathy and endocrinopathy syndrome is the human equivalent of mouse scurfy. Nat. Genet.   27:18–20.

Roles Of The Operating System Computer Science Essay

Roles Of The Operating System Computer Science Essay All computers need some form of operating system so that communication between users applications and hardware. The OS also looks after the file system. With advancement in technology OS can now support more than one User, Task or Central Processing Unit (CPU). The OS controls the communication between applications and hardware. For the OS to communicate with these it installs device drivers for any hardware component that is inside the computer. the device driver is created by the hardware manufacturer and this is installed with the hardware software when installing. Thus allowing the OS to talk to the hardware its self. for example a wireless USB adapter (Fig1.1) would install a device driver as shown in (Fig1.2) Files and folders can be stored on the hard drive with the help of the OS creating a file structure on the hard disk its self enabling the data to be stored. Files are stored in a block of data that is treated as a single unit and is given a single name. Any files related to the same program are put in to folders so that the program is able to find all the data needed to run the program without needing to look all over the hard drive. Folders can also be stored inside other folders if they relate to a different part of the program or even an update folder or a uninstall program in the event you want to uninstall the program. These are call subfolders. (Fig 2.1) The structure in which files are stored on a hard drive are stored in a table called file allocation table. the table contains all the details of where each piece of data (such as blocks or clusters) is held that makes up the file on the hard drive. Depending on how the hard drive was formatted depends on the table format and cluster size. There are two different file structures which are: File Allocation Table 32-bit (FAT32) This can support partition sizes up to 2048GB (2TB) FAT32 can be used in Windows 95, Windows 98, Windows Me, Windows 2000 and Windows XP(Fig 2.2). New Technology File System (NTFS)This can support partitions sizes up to 16 Exabytes. 1 Exabyte is 260 bytes. With NTFS there is improved security features and extended attributes that the previous version used FAT32 (Fig 2.3). FIG 2.1Folders and Subfolders FIG 2.2 FAT32 FIG 2.3 NTFS User Interface Operating systems provide the user to interact with the software and the hardware by using two types of user interface called Command-line Interface (CLI) with this the user types commands in to the command prompt as shown in Fig 3.0 Graphical user interface with this the user interacts with menus, icons and applications as shown in Fig 3.1 Fig 3.0 Fig3.1 Applications Management Within the operating system one of the things it does is locates an application and loads it in to the RAM. Applications a software programs such as Microsoft Office word, Microsoft Office Excel, Microsoft Office PowerPoint, Games and many more. the OS will make sure that each application has enough system resources to run the program successfully. There is also a set of guidelines used by programmers to make sure that the application they are designing will work on an OS this is called Application Programming Interface (API) two examples of these are: Open Graphics Library (OpenGL) this is a cross-platform standard for multimedia graphics DirectX this is a collection of APIs for multimedia tasks for Microsoft Windows 1b. Within WindowsXP and Windows Vista Operating systems have the following features installed: Multitasking Multiuser Multiprocessing Multithreading Multiuser A multi-user operating system allows for multiple users to use the same computer at different times. So this mean that each user can have its own logon to windows where they can have their files can be secure so that only the user can see them. they can also set the computer display up however they want to such as picture backgrounds of the own choice and task bar settings changing the colour to their own choice. With the account been password protected and the files been stored on the same user logon this makes it secure. When logged on to the computer you can also switch users quickly what this does is keeps the first user logged on but just locks the account and takes you back to the user logon screen and enables you to log on as another user then once you have finished on that account you can just log of and then back at the logon screen you just click the first name again and type the password and you are right back in to it where you had left it so any programs that you had ope n are still open and you can carry on instead of waiting for the computer user settings to be applied making it much faster to change between users. Multitasking An operating system that is capable of allowing multiple software processes to run at the same time. So what this mean is that you can run many different programs at the same time. so you can be working on a document on Microsoft Office Word so the program will be loaded in to the RAM so that it can access it quicker when using the program. So your using the program then you need to use Microsoft Office Excel when you click open on the program it will also load it in to the RAM as well so that you can access the program data as well as the other program. This is multitasking. This would happen every time you opened a new program. Multiprocessing An operating system able of supporting and using more than one computer processor. Most modern computers support some form of multiprocessing. Multiprocessing doesnt require more than one physical CPU; it is simply the operating systems ability to run more than one  process  on the system. The operating system processes data one part at a time. Each process can execute a completely different program while most processes are completely independent. so if say you are running paint in windows and then open Microsoft office word even though it looks like it is doing them at the same time what it is doing is processing parts of the program one at a time. but because of the seep in what it processes them it gives the appearance that they are doing it at the same time. Multithreading Multithreading has many purposes one of these is to switch between different threads. However the main purpose is to increase the operation of a single core by monitoring and controlling the levels of threads. The tasks carried out by the user happen so frequently that the user does not actually see the threads and/or the tasks are running at the same time, with no fault. Another purpose of multithreading is used by the Operating System to break down a program in use into smaller, more manageable threads when it is required to carry out this specific task. Although it does allow individual programs to be multitasked. This is done because the hardware used for multithreading regularly operates alongside the software for multitasking. It is known for some CPUs to have more than one multithreading core; these are often referred to as processors. On multiprocessor, or multi- core systems, the tasks and threads generally run at the same time, with the support of each processor and/or core running a particular task on the Operating System. 1c. In both Windows XP and Vista there are functions installed on an OS. These functions might be at different levels depending on the OS. These functions are:- Backup Facilities File Management Security Backup Facilities Many backup facilities are used here are a few examples: Daily Copy Normal Incremental Differential Daily A daily backup only saves files that have been modified on that day. This type of support does not modify the other files. Copy This type of support only copies the data and files chosen. For instance a word document is saved in one folder and you copy to another folder of the same OS. This backup can be found in all Windows software. Normal This type of support (full backup) is when the selected files and folders are to be stored and are archived to the hard disk drive. For example an Excel spreadsheet that is being saved for the very first time. Incremental This type of backup saves all folders and files that have been created or modified since the last normal backup. A benefit of this is that the backup times are faster as only the file needs to be saved. However, a drawback of this is that the recovery time of the file will be a lot longer as the data has to be restored from the last incremental backup and/or another backup device. Differential This backup saves all files a nd folders that are created or changed since either the last normal backup. These files are not archived, on the other hand they are copied at the starting point until the next incremental or full backup is complete. Making this type of backup is important as to restore the data you would only need the last full and differential backup. File Management File management is also very similar in Vista and Windows XP. Generally it is a lot easier to manage files and directories in Windows XP than it is in Vista because in Windows XP the graphical user interface I find is much more user friendly. There are options to make Vista act and look like Windows XP through; Start, Control Panel, Appearance and Personalization. Both XP and Vista use NTFS file management. However, in Windows Explorer the file management enforces/performs a hierarchical structure. Below is a broken down step by step of what happens when creating a file in a directory: The OS controls and creates the file structure and directories The hard drive allows data to be stored in this structure The file is then stored on to the hard drive and is given a name or commonly known as a single unit/name The directory programs and data files group all the files together and create the directory (Some directories can be stored in other directories these are commonly known as subdirectories) One last point about directories and subdirectories is that their commonly used name is now folders and subfolders, respectively. Security There are four main ways in which to protect computer systems, these are: Firewall This provides protection against any online threats. Anti-virus software which tries to protect the operating system from any malicious threats that could occur. Passwords is used to protect the contents of the operating system and is a method of controlling who access to it. Encryption is used to prevent people accessing documents they are not permitted to see. The main security feature for Windows XP is designed to continuously monitor the status of the computers security system settings and should a problem occur the operating system will provide a pop up to warn the user of the problem. This security system is referred to as the security centre. Windows Vista has a similar security feature called Windows Defender, however Windows Defender has a few additional features. These features include the removal of ActiveX applications and also support the use of SpyNet software. Also with Vista there is another few security features, one of them is the Parental controls. This allows the administrator to: Control content of which a child can and cannot view. Limiting time allowed on the Internet or computer. Monitor what the child does and track viewed websites and content they have previously looked up. However, on both Windows XP and Vista, they use one vital piece of security the Device Manager. This is used to allow users to view and control the hardware attached to the computer. A piece of hardware is attached is not working, this is highlighted to the user to deal with the hardware problem. The options that the user can deal with each piece of hardware is to supply drivers for the hardware keeping them up to date, enable or disable devices connected to the computer, ignore malfunctioning devices and to view other technical properties to do with the hardware connected.

Government :: essays research papers

  Ã‚  Ã‚  Ã‚  Ã‚   Marriage is a word where a man and a woman come together in the eyes of God and pronounce their love for one another and are joined together as one. This concept has been the ways of the world for hundreds of years. However, marriage back during the eighteenth (18th) and nineteenth (19th) century was completely different from the way it is in the twenty-first (21st) century. Woman of today have better equal right to the world where they are seen as equals to men than woman back in the day. Over the years ancient philosophers tried to dissect the concept of equality for woman back during the 18th and 19th century. One of those philosophers was John Stuart Mills who developed a writing called the Subjection of Women, which dealt with the women’s emancipation. He also made references of sexual equality in his other works (Utilitarianism, On Liberty) as well. The institute of marriage has been oppressive to woman why is that so? That is what we are going to explore and find out. The institute of marriage was a burden to women during the 18th and 19th century because they were not seen as equals. They were either forced into marriage by their parents by marriage arrangements or they married for survival in the world. The men during that time were seen as the breadwinners. Men work to support the family financially, where the women bared the children, kept the home clean and ensured that there was a meal on the table every day. Women were not allowed to vote, play a role in politics, nor could they earn an income to support their family. Whatever the husband voted or how he played a role in his career and politics was the wife’s position as well. John Stuart Mills was a philosopher who believed in utilitarianism, which is the greatest happiness of the greatest number of people. He believed this to be for both men and women. He advocated for women because he believed they needed to prosper in societies. He said that â€Å" women expressive power has been stifled and that if women fail to developed and if they are excluded from involvement, society as whole is impoverished if it denies itself their contributions † (Subjection of Women) He believes that women need to be out in the world doing the same things as men, and that they can contribute a lot to society.

Regulation in Mass Media Essay

The responsibility of the FCC and their regulations are often questioned if they are necessary or not. By examining Horwitz’s â€Å"The Evolution of the American Telecommunication System and the Origin of Communication Regulation. ,† one could take the side that the regulation of media is necessary. Regulation of media is necessary to prevent a monopoly– which is one company controlling the entire market. If there was a monopoly on media then the company could charge and price whatever they want and only give service to those they wanted to. By having media regulations this is not able to happen. Natural monopolies in wired carriers, which are monopolies approved by the FCC, keep costs down and prevent a cluttering of wiring in the air or ripping up streets to install underground wiring. The first sign of natural monopoly was with AT&T and the telephone. According to Horowitz, it states: â€Å"Under the leadership of Theodor Vail, AT&T maintain the telephony constitution a natural monopoly. One policy, one system, and universal service’ was Vail’s ot-reapted slogan. † (Horowitz, Page 99) Vail argued that by having more then one provider there would be a waste of resources and if there was one provider pooling its resources they would be able to provide a better service to the customer. Though this might be true, unless there is regulation by the government this idea of natural monopoly would be horrible. Now the FCC regulates any kind of natural monopoly that exists within universal carriers of a med ia. The beginning of regulation began with the start of large scale communication, other then print, in 1835 when Samuel Morse proved a signal that could transmitted a message by wire. Morse used pulses of current to provide a written code on a strip of paper. This code became known as the Morse Code. Morse gave a public demonstration in 1838 to congress, but it took congress over five years to fund Morse’s experiment of the telegraph. Congress funded Morse $30,000 to construct a 40 mile experiment from Washington to Baltimore, using telegraph wire. It took six years before a message was sent and received over the telegraph wire. This was the first time a message had been transferred other then print or word of mouth. Western Union became the main provider of the telegraph service, and became a monopoly in 1867. The telegraph created the umbrella of commerce, which was the first time the government intervened with communications. According to Horwitz, a common carrier obligation was established for all carriers that provided service for the telegraph. Telegraph companies resemble railroad companies and other common carries, in that they are instruments of commerce and in that they exercise a public employment and are therefore bound to serve all customers alike without discriminations, they have doubtless a duty to the public to receive to the extent of there capacity all messages clearly and intelligible written and to transmit them upon reasonable terms but they are not common carriers, there duties are different and are perfo rmed in different ways and they are not subject the same liabilities. (Horowitz, Page 95, 96) What this law meant was that there could be no discrimination in who the provider wanted to extend service to. In 1895 the first radio message was transmitted by Marconi. Radio area waves were open to who ever could make a device to transmit messages to other people with the same device. Broadcasting became more and more popular. According to Horwitz, â€Å"broadcasting-the dissemination of electrical messages through the airwaves to an undifferentiated audience-may not have been contemplated, but it was inherited in the technology of radio. (Horowitz, Page 112) Radio became more and more popular and the government stepped in like they did with the telegraph and telephone and began regulating radio. The first major regulation was the Radio Act of 1912. Before this, radio waves were open to the public. The airwaves started to become too crowded and the U. S. government decided to take actio n. The Radio Act of 1912 established government control over the airwaves and created guidelines for issuing licenses and distributing radio airwaves. The Radio Act of 1927 was the second major act that was established to regulate the media industry. This act created the Federal Radio Communications (FRC), which was responsible for giving licenses to broadcasters. This act also made it so that the radio airwaves were a public resource. As a result, broadcasters were required to serve the public interest. The regulations of broadcasted media and the regulation of print media are different. The regulation of print deals with copyright laws. Anyone could publish anything they want but if some one uses someone else’s words without proper notation they could be sued. Print is regulated more when dealing with news print; for example the newspaper. Most print media would not use profanity or any kind of naked pictures. Print media is mostly written based on ethics. The writer tries not to take sides or out right seem bias towards one particular side. Broadcast media like radio have different kinds of regulations. In order to have air time on the radio one needs to have a license. Radio also must provide a public service toward the listener. Radio just like print media tends to stay away from profanity and over sexual connotations. Print media usually has a fee, whereas, radio is free to the public. Both of these media’s have regulations but have different kinds of regulations from the FCC. Overall, the world of mass media has many regulations that exist. These regulations are decided by the FCC, which is an independent government agency created under the Communications Act of 1934. At the beginning the FCC was responsible for regulating broadcast, telegraph, and telephone. Now the FCC has expanded its regulations to include new communication technologies such as: the satellite, microwave, cellular telephones, PCS service and private radio communications. As one could see, the responsibilities of the FCC are necessary in monitoring both the delivery system and the actual media itself. Overall, by using Horwitz’s â€Å"The Evolution of the American Telecommunication System and the Origin of Communication Regulation. ,† one could tell the history of regulation and how important it really is to the people.

Fiscal Policy in the 1960s and 1970s

Fiscal Policy in the 1960s and 1970s By the 1960s, policy-makers seemed wedded to Keynesian theories. But in retrospect, most Americans agree, the government then made a series of mistakes in the economic policy arena that eventually led to a reexamination of fiscal policy. After enacting a tax cut in 1964 to stimulate economic growth and reduce unemployment, President Lyndon B. Johnson (1963-1969) and Congress launched a series of expensive domestic spending programs designed to alleviate poverty. Johnson also increased military spending to pay for American involvement in the Vietnam War. These large government programs, combined with strong consumer spending, pushed the demand for goods and services beyond what the economy could produce. Wages and prices started rising. Soon, rising wages and prices fed each other in an ever-rising cycle. Such an overall increase in prices is known as inflation. Keynes had argued that during such periods of excess demand, the government should reduce spending or raise taxes to avert inflation. But anti-inflation fiscal policies are difficult to sell politically, and the government resisted shifting to them. Then, in the early 1970s, the nation was hit by a sharp rise in the international oil and food prices. This posed an acute dilemma for policy-makers. The conventional anti-inflation strategy would be to restrain demand by cutting federal spending or raising taxes. But this would have drained income from an economy already suffering from higher oil prices. The result would have been a sharp rise in unemployment. If policy-makers chose to counter the loss of income caused by rising oil prices, however, they would have had to increase spending or cut taxes. Since neither policy could increase the supply of oil or food, however, boosting demand without changing supply would merely mean higher prices. The President Carter Era President Jimmy Carter (1976 - 1980) sought to resolve the dilemma with a two-pronged strategy. He geared fiscal policy toward fighting unemployment, allowing the federal deficit to swell and establishing countercyclical jobs programs for the unemployed. To fight inflation, he established a program of voluntary wage and price controls. Neither element of this strategy worked well. By the end of the 1970s, the nation suffered both high unemployment and high inflation. While many Americans saw this stagflation as evidence that Keynesian economics did not work, another factor further reduced the governments ability to use fiscal policy to manage the economy. Deficits now seemed to be a permanent part of the fiscal scene. Deficits had emerged as a concern during the stagnant 1970s. Then, in the 1980s, they grew further as President Ronald Reagan (1981-1989) pursued a program of tax cuts and increased military spending. By 1986, the deficit had swelled to $221,000 million, or more than 22 percent of total federal spending. Now, even if the government wanted to pursue spending or tax policies to bolster demand, the deficit made such a strategy unthinkable. Note This article is adapted from the book Outline of the U.S. Economy by Conte and Carr and has been adapted with permission from the U.S. Department of State.

How to Become a Paraprofessional

How to Become a Paraprofessional When you think of a classroom, you may think of one teacher at the head of the class, working with a group of students. What you may not consider is that many classrooms have another adult there, helping students learn- a paraprofessional, or teaching assistant.What Does a Paraprofessional Educator Do?Paraprofessionals are an essential part of the education system- think of them as classroom all-stars. They may work closely with teachers on general classroom lessons or tasks, or work one-on-one with students who have special needs or disabilities. Paraprofessionals can be found in elementary schools, secondary schools, or daycare facilities. Their tasks may include:Assisting teachers with lessons or classroom activitiesAssisting teachers with paperworkHelping teachers with lesson planningPreparing classroom equipment or technologyWorking with students who need individualized attention in the classroomSupplementing classroom lessons with additional guidance or activitiesTutoring stude nts who need extra helpMonitoring student behavior both in the classroom and at school activitiesAssisting students who have special physical needs (lifting, feeding, moving)Processing homeworkTaking classroom attendanceParaprofessionals may also choose to specialize. For example, some paraprofessionals work in school libraries/media centers. Some are assigned to specific classrooms. Some work exclusively with special education students. Paraprofessionals can be found in all types of schools, plus childcare facilities as well.What Skills Do Paraprofessional Educators Have?Paraprofessional educators need many of the same skill sets that any teacher would need, given that they work directly with students in an educational setting. These are some of the most crucial skills you’d need to have as a paraprofessional:They Like KIdsThis may seem like a no-brainer, but if you don’t like kids, or have trouble relating to them, this would be a very challenging career path. Patien ce is a major asset for anyone working with students.Theyre Team PlayersParaprofessionals are part of a squad of teachers, administrators, and support staff who help educate students. Knowing how to work as part of a team to maintain students’ best interests is essential.Theyre Great CommunicatorsParaprofessionals may be called upon to teach new concepts to kids, or translate information so that a student can learn and understand. Paraprofessionals may also be in the position of having to interpret what a student is trying to say, so listening skills are key as well. Because paraprofessionals will need to communicate with students, teachers, administrators, and possibly parents/guardians, the ability to communicate clearly and articulately is a major part of the job.Theyre OrganizedIf you’ve ever been in a classroom, you may have noticed that good organization can be the difference between a calm learning environment and chaos that distracts everyone from the tasks at hand. As a paraprofessional, you should have a good sense of organization when it comes to recordkeeping and classroom behavior.Theyre Good TeachersParaprofessionals are often assistants and helpers, but they are also educators. As an educator, you should have the ability to teach information to students of varying abilities and learning styles.What Education Do Paraprofessionals Need?Paraprofessionals can usually get started in the field without a four-year college degree, but it helps to have completed some college courses or an Associate’s degree, particularly in Education.Each state and school district has its own rules for paraprofessional certification, so you should see what your state requires. However, many require that paraprofessionals complete an aptitude test (like ETS’s ParaPro exam) to certify that these educators meet a minimum standard.How Much Do Paraprofessionals Get Paid?According to the U.S. Bureau of Labor Statistics, paraprofessionals earn a medi an salary of $25,410 per year. This can vary according to location, and paraprofessionals who are multilingual, or who specialize in areas like special needs or special education, can earn more as well.What’s the Outlook for Paraprofessionals?While education changes constantly, some parts of it never do- there will always be a need for qualified teaching professionals to assist in classrooms and work with students. The U.S. Bureau of Labor Statistics predicts that the field will grow by about 6% by 2024- about the average for all occupations.Becoming a paraprofessional is a great option if you’re just figuring out whether you want to work in education in the long term, or if you know you want to be an educator but just aren’t ready to complete the education and certification required of teachers. Being an educator is one of the most challenging and rewarding paths you can choose, and if you think it just might be your calling, becoming a paraprofessional could b e your ideal first step.