Basic Memory Management Without Swapping Computer Science Essay

Basic Memory Management Without Swapping Computer Science Essay Program execution is the main propose of computer system .During execution programs are together with the data they access with in main memory. To keep track of what memory is in use and what memory is free is called memory management. Allocate the free memory to the process when any process needed the free space and de-allocates it when they don’t need the free space. Ideally, programmers want memory that is Fast Large Nonvolatile There are two classes of memory management systems, those that transfer processes to and from disk during execution are the swapping or paging .And those that don’t are the simple and might find this scheme in embedded device, phone, smart card, or PDA. Basic Memory Management without Swapping or Paging There are three simple ways of organizing memory, operating system with one user process. How to divide memory Two approaches are one divide the memory into fix equal partitions and the other is partition size can be loaded into any other par tition. Equal-sized partitions Any unused space in the partition is wasted called internal fragmentation. And process which is larger than partition cannot be run. Fixed size partitions In fixed partition processes are in queues that are fits in it, but some partitions may be idle because jobs are available in small partitions and only the large partition free. Memory management in Operating systems Linux Memory Management: There are two main component of Linux memory management. The first one component is to assign and freeing the space, after using the physical memory. The second component deals with virtual memory. Physical memory management Linux divide its physical memory into three different parts because it has different hardware characteristics. These three parts are the following: Zone DMA Zone NORMAL Zone HIGHMEM. Page allocator is the primary physical memory manger in Linux. For every zone separate allocator is exist which allocate and freeing the space for the zone. The allocator uses the Buddy system to keep all records about physical pages which is available at the time in memory. Memory splitting into Buddy system Virtual memory management There are many types of virtual memory regions in Linux. Backing store for the region is the first property of this memory. Which describe the pages region that from where it is to come. Mostly region is back by nothing which represents the demand-zero memory. Windows Memory Management: The window provide many ways to the application for using memory like virtual memory, heaps, memory mapped files and thread local storage. Virtual memory VirtualAlloc() is the method which is used to allocate the virtual memory and virtualFree() method is use to de-allocate the space into virtual memory. The virtual address in which the memory is allocated through these functions applications are enable. They operate on multiple pages which are in memory and the starting address must be greater than 0*10000. Heaps Applications used the memory space also through heap. In this environment address space is already reserve. When API process is start (also called initialized) it creates the 1-MB default heap.

Wreiter choice Research Paper Example | Topics and Well Written Essays - 2000 words

Wreiter choice - Research Paper Example The effects of media are felt differently in various parameters but there are common effects that will be critically analyzed in this article. The evaluation will therefore incorporate more knowledge into the reader of the article on the absolute effects of media in the society. This article will highlight appropriate issues that an individual should know in the matter of effects of mass media to the society. The influence of media in our lives thus the society as a whole is greatly related to the degree in which an individual interacts with the elements of media on a daily basis. Books are always highly influential because they came first before articles such as magazines, newspapers, and radio. In the 20th century, the television and radio were very influential as they were used in advertisements, marketing and many more. By the 21st century the great influence was from the internet through the worldwide website inform of blogs, social networks, and wikis. First, there should be a distinction between the effects and effectiveness of the mass media. In the capacity to achieve certain objectives whether attracting large audiences or influencing opinion and behavior of individuals. Both of these matters are paramount though there are a different set of consideration relating to each other. The second issue is whether individuals are concerned with the future or past thus this will facilitate their interaction with media to be often due to the search of particular important information. The last point is to know if the effects occur on an individual, group, culture, institution, or the society. In this case the major focus is on the effects and influence on the society (Perse & Elizabeth, 51). The effects of media on the society are always difficult to recognize because they take long to happen and they are always evolving on a daily

Impact of Telephone Technology on Society Research Paper

Impact of Telephone Technology on Society - Research Paper Example Specifically, the upsurge in 3G connections, sustained by the production of the current data-enabled devices which permit mobile internet connectivity, caused a huge growth in mobile data use. Currently, an examination of the economic influence of this technological transformation has been restricted by data availability. However, Van (2012) used VNI Index data of Cisco for 14 nations to investigate this concern and he found a strong relationship existed between economic growth and mobile data usage per 3G connection. Van also asserts that doubling the use of mobile data causes the GDP per capita to increase by 0.5 percentage points. Although the effects of telephone have fully been realized in developed markets, telephone technology continues to offer strongly assist developing markets. Issa, Isaias & Kommers (2013) who measured the influence of ‘simple’ telephone penetration on Total Factor Productivity of a nation – a parameter of economic productivity which al ways reflects the technological dynamism of an economy – found out that an increase of 10% in telephone penetration upsurges Total Factor Productivity by 4.2% in long run. Telephone technologies add considerably to GDP growth. It is projected that the technology will occasion a 1.8% GDP growth in UK and 24.9% GDP growth in Egypt across 2010-2020. Again, Issa, Isaias & Kommers (2013) claim that the impact will be great in developing nations. They claim that the impact of increasing phone subscriptions, across 10 nations.

System Security Essay Example | Topics and Well Written Essays - 500 words

System Security - Essay Example The virus attack can only be possible to a system via removable storage devices (zip drive, jazz drive, and floppy drive) which mean a system can be protected from such attacks if the external removable devices are pre-scanned before its usage. During the current era of globalization, every LAN is connected to the biggest LAN i.e., internet one way or the other. Nearly all the financial institutions and government bodies have connected their systems over the internet to give their authorized users an ease of access from any part of the world. On one hand this has alleviated the boundaries between different countries and made communication possible in real-time between two ends of the world but on the other hand it has given an edge to the cyber criminals to breach through the complex systems by finding its loopholes. Due to the threat of hacking, none of the national security and financial data is safe from these cyber criminals unless well protected by using different pro-active techniques such as: 1) Data encryption 2) Firewalls 3) Identifying the loopholes in the current system and creating a patch for it. The encryption technique has been successfully used for data transfer between two ends over the internet because even if the data is tapped by a hacker, he cannot decrypt it since he is inaccessible to the public key for decryption. The firewall softwares are used to guard against the brute force attacks and access from an invalid domain but due to the loopholes which exist in the current operating systems these firewall softwares occasionally fail. Up till now the hackers are usually focusing on financial institutions for the monetary benefits, but in the future these hackers could also be used to manipulate the national security data and the personal ids to wage any degree of chaos as desired. This situation is expected only because we have created the space for this threat by ourselves by storing every personal data and

Stems Cells Research Paper Example | Topics and Well Written Essays - 1000 words

Stems Cells - Research Paper Example Stem cells refer to undifferentiated cells that have the capacity to differentiate and form specialized types of cells; these cells also have the ability for self regeneration. The potential of stem cells to differentiate encompasses the ability to develop and form other cell types. For instance, a totipotent stem cell such as a fertilized egg can develop into cell types such as embryonic membranes. In addition, a pleuripotent stem cell can advance and develop into cell types, which may emanate from all three germinal layers. Self-regeneration entails how stem cells divide, leading to the production of other stem cells. The division takes place symmetrically during the early stages of development. This means that each cell undergoes division, resulting to daughter cells that have the same potential (Panno 1). Later on, asymmetrical division takes place with one of the daughter cells produced during symmetrical division, leading to the production of a stem cell and another cell that has more differentiation. Stem cells tend to occur in most multi-cellular organisms. They have the ability to undergo mitotic cell division and renew themselves. As a result, they may differentiate into numerous specialized cell types Panno 10). There are two main sources of stem cells; these include embryos that may be formed during embryological development (embryonic stem cells) and adult tissue, which can also be referred as adult stem cells. Adult stem cells can also be referred as somatic stem cells; after the development of the embryo, they can be found all over the body. Embryonic stem cells emanate from a human embryo, which can be four or five days in the development phase known as a blastocyst Panno 12). Cloning refers to the process whereby there is the production of multiple offspring that tend to be identical. It entails the asexual production of a copy that looks exactly like the original. For instance, cloning can be used in the production of

Auditing Essay Example | Topics and Well Written Essays - 1750 words

Auditing - Essay Example However, globalisation is also associated with different business and financial risks. Globalisation can have varied effects on different economies in the world. Various forces like investors, borrowers, financial institutions, etc. are having an impounding effect on increased levels of financial globalisation (Schmukler, Zoido & Halac, n.d., p.1). With globalisation and associated risks, accounting and auditing procedures are also encountering significant changes worldwide. In this report the effects of globalisation on auditing mechanisms and various developments of auditing procedures have been studied. Globalisation Globalisation can be defined as the process of increasing association of the markets worldwide and the interdependence between the business processes followed by different organisations all over the world. Recent years have encountered a rapid increase in such phenomenon. Globalisation describes the spread and interconnectivities of new advanced technologies, communic ation systems and production all over the world (Smith & Doyle, 2002). The two important driving factors towards globalisation are: a) Advancements in infrastructure of telecommunications and b) the increasing use and advancement of internet. The economies of the world are getting connected and resulting in increased opportunities for business concerns as well as rising competitions amongst themselves. There is a development of sharing of international cultures as well. The expansion of trade worldwide and globalisation have brought about significant benefits for different economies all over the world. However the recent Global Financial Crisis has somewhat put a hold on the globalisation process (International Monetary Fund, n.d.). Various benefits to citizens of a country as a result of globalisation includes admittance to increased varieties of products and services at lower costs, increased number of job opportunities, higher standard of living, etc (International Monetary Fund, February 2008). Effects of Globalisation on Accounting and Auditing The number of business organisations operating globally is vast and it is increasing at an increasing rate. This puts emphasis on the development of accounting language which is common to all the countries in the world. Globalisation has brought about significant changes in the accounting and auditing procedures all over the world. There had been profound changes in reporting standards of financial statements of organisations as a result of globalisation. This is quite evident from instances like the convergence agreement that has been signed between International Accounting Standards Board (IASB) and Financial Accounting Standards Board (FASB) in the year 2002 and the adoption of International Accounting Standards (IAS) or International Financial Reporting Standards (IFRS) by the European Union (EU) in the year 2005 (Ding, Jeanjean & Stolowy, 2008, p.145). Globalisation is having a significant effect on the accoun ting profession itself. With the advancement of information technology and internet web based financial reporting systems are becoming more common and also mandatory for most of the business concerns. The accounting models used by different business organisations have changed. Globalisation has also brought about changes regarding the systems of communicating financial

Back to the Basics in the United States Military Essay

Back to the Basics in the United States Military - Essay Example We have not had time to focus on these topics as the stress and vital importance of war time action has directed our focus elsewhere. Accordingly, things such as daily uniform inspections, barracks inspections, drill and ceremonies, proper counseling, and many similar items have, at least to a certain extent, been disregarded in favor of more pressing needs and goals. However, these performance duties are referred to as â€Å"the basics† for a reason; as such, it is our duty to get back to them. Because of the lack of focus on these points over the past few years, our junior NCOs and Soldiers are suffering and we as senior NCOs are responsible for correcting these deficiencies. Emphasis should be placed on the importance of sitting down with junior NCOs and showing them the proper ways to lead soldiers. Perhaps one reason for the current lack of concern is the fact that many NCOs appear to be only interested in promotion. This fact coupled with the self interested notions of m aking more money has taken away from the prime directive of leading and protecting the soldiers under ones supervision. This lack of concern is illustrated in the fact that few SGTs really know where to take their Soldiers if they have pay issues, family issues, budget issues, etc.? There are many who would have no idea. This results from several reasons, not the least of which is the fact that as soon as the promotion board is complete, these soldiers often do a brain dump and purge their minds of all the information they accrued while studying for the board. Obviously, this should not be happening; soldiers must remember what they learned from studying and be able to take knowledgeable care of the soldiers under their charge. In order to get back to these basics, there are several steps that must first be implemented. First, we must recognize that the Soldiers standing in our