An Introduction To Intrusion Detection Systems :: Computer Network Security

I decided to write my paper on Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) because professor mentioned these devices several times in class and I am interested in network security therefore it was a good opportunity for me to learn more about these security systems. An intrusion detection system (IDS) generally detects unwanted manipulations to computer systems, mainly through the Internet. The manipulations may take the form of attacks by crackers. An intrusion detection system is used to detect many types of malicious network traffic and computer usage that can't be detected by a conventional firewall. This includes network attacks against vulnerable services, data driver attacks on applications, host based attacks such as privilege escalation, unwanted logins and access to sensitive files, and malware (viruses, Trojan horses, and worms). Intrusion detection is the process of monitoring the events occurring in a computer system or network and analyzing them for signs of possible incidents, which are violations or imminent threats of violation of computer security policies, acceptable use policies, or standard security practices. Intrusion prevention is the process of performing intrusion detection and attempting to stop detected possible incidents. Intrusion detection and prevention systems (IDPS) are primarily focused on identifying possible incidents, logging information about them, attempting to stop them, and reporting them to security administrators. In addition, organizations use IDPSs for other purposes, such as identifying problems with security policies, documenting existing threats, and deterring individuals from violating security policies. IDPSs have become a necessary addition to the security infrastructure of nearly every organization. An IDS is composed of several components: Sensors which generat e security events, a Console to monitor events and alerts and control the sensors, and a central Engine that records events logged by the sensors in a database and uses a system of rules to generate alerts from security events received. There are several ways to categorize an IDS depending on the type and location of the sensors and the methodology used by the engine to generate alerts. In many simple IDS implementations all three components are combined in a single device or appliance. In a network-based intrusion-detection system (NIDS), the sensors are located at choke points in the network to be monitored, often in the demilitarized zone (DMZ) or at network borders. The sensor captures all network traffic and analyzes the content of individual packets for malicious traffic.

Pump Characteristics :: essays papers

Pump Characteristics INTRODUCTION In industry, the performance specifications for a particular pump may be known, but the tests are usually based on water as the pumping medium. For liquids of significantly higher viscosity than water, these performance curves may only be accurate at certain flow rates, or they might not be valid at all, and it might be necessary to recalibrate the specifications for higher viscosity liquids. The purpose of this experiment is to examine the performance and characteristics of a centrifugal pump, its motor, and the corresponding piping system, used to pump an ethylene glycol solution. The pump used in this experiment has a performance curve based on water, so pump performance curves, as well as motor performance curves, will be developed over a wide range of flow rates to determine the effect that the liquid viscosity and density have on the performance of this pump. Also, the pressure drop of the piping system will be examined to determine the extent of, if any, fouling in the pipes. OBJECTIVES Â · Develop pump performance curves over a wide range of flow rates. This involves relating total head, horsepower input, efficiency, and NPSH as a function of pumping capacity (in gpm), similar to Figure 3-36A (Lab Manual). Â · Develop motor performance curves over a wide range of flow rates. This involves relating the current supplied to the motor, motor shaft rotational speed, motor efficiency, and the power factor as a function of the load of the motor, similar to the figure on page 21 of the Lab Manual. Â · Develop the friction factor chart for the piping system. This chart shows the relationship between the fanning friction factor and the Reynolds number over a wide range of flow rates, from which the roughness parameter (e/D) for the piping system can be estimated. Â · Determine the optimal flow rate delivered by the pump. This value is estimated by neglecting all of the friction head losses outside the loop of the piping system. Â · Examine the effectiveness of the pump. The performance curves based on the ethylene glycol solution will be compared to those developed using water as the base to examine the effect, if any, the viscosity and density of the liquid has on the pump. EXPERIMENTAL SET-UP A process flow diagram of the pump system is shown in Figure 1. The main components of the system are a centrifugal pump with a 4Â ½-inch impeller, a 2-horsepower motor, a piping system with an effective length of about 285 feet, a rotameter for low liquid flow rates (0-2 gpm), a magnetic flow meter for high liquid flow rates (0-90 gpm), and a tank.

Postcolonialism

Postcolonial is that which questions, overturns, and / or critically refracts colonial authority-its epistemology and forms of violence, its claims to superiority. Postcolonial therefore refers to those theories, texts, political strategies, and modes of activism that engage in such questioning, that aim to challenge structural inequalities and bring about social Justice. It is helpful to view postcolonial in a comparative frame alongside feminism.Both these approaches arrived at points of critical self-awareness in definitive periods of civil rights protests. This conjunction ay be partly explained by the fact that both approaches champion resistance to entrenched singular forms of authority (patriarchy, empire) from below or from positions of so called weakness. Both too seek the politicians of areas conventionally considered as non political: the domestic space, education, sport, the street, who may walk where, who may sit where, and how.Some of the central critical concepts of po stcolonial developed out of nationalist struggles for independence in the early half of the twentieth century. The political and cultural reforms proposed y anti-colonial movements in such countries as India, Egypt, Algeria, Ghana, Kenya and in the Caribbean, formed the fountainhead of what we now call postcolonial. At first, these movements advocated a politics of assimilation of ‘natives' or the colonized into colonial society for them to obtain self representation.They began with limited demands for piecemeal constitutional reforms but it became rapidly clear that the colonial authorities were not ready to dismantle the social, economic and political hierarchies on which their control rested. After the end of World War II, anti colonial nationalist movements took a more confrontational, no-compromise attitude. The demand was for complete independence. This demand extended not only to the liberation of political structures but also to the obliteration of the colonization of the psyche.The sass marked a period of growing militancy in movements across the colonized world. Alongside came the retrieval and animation of indigenous culture as an important vehicle of national self expression and thus of resistance to the colonial exclusion of the native as uncouth, uncivilized inarticulate and irrational. The nationalist leaders and intellectuals like Gandhi and Nehru in India, fanons in Algeria and Came Markham in Ghana, helped define the major ideologies of postcolonial liberation.They shaped some of the definitive concepts of postcolonial studies, as later interpreted in the works of Edward Said. They understood the anti-colonial struggle as a Mechanical, or binary, conflict of us against them, of self versus ‘other'. The binary between the so-called rational, superior colonial self and the barbarism and irrationality indicated by everything that was not-self or ‘other' was to be repudiated wholesale. It was not Just to be turned upside down, b ut also destroyed. The chains of oppression were to be obliterated and not simply filed down.If natives or others were always seen as secondary figures, imperfect replicas of the colonizer, wearers of borrowed cultural rags; if native society was invariably represented as disorderly or ethically degenerate; it was important that they remake themselves from scratch. It was essential that they reconstitute their identity on their own terms, that they Initialized, Africanize, or Caribbean themselves. They effectively needed to give birth to a new identity, to peak in a language that was chosen, not imposed. The liberation struggle involved a tripartite process.It led from attempted cultural assimilation with the colonizers, the first stage, through attempts at political reform, sometimes of an intensively radical kind, as in demands for self -help and self-representation, the second stage. But if the colonial state proved intransigent, as it so often did, from this phase of forceful se lf-assertion developed a possible third stage; outright militant resistance. As Robbing wrote , conditions could arise where ‘national life' had to become ‘perforce a national assault'.

Analysis the Motorbike Market in Vietnam

Vietnam by motorbike take 61% of the total and by 4 times comparing with people who use car as main vehicle. Thus, motorbike market is an important part of Vietnam economy and considerable contribution to economic growth in recent years of Vietnam. Therefore, in this report are going to analyze the Motorbike market in Vietnam in both aspects: microeconomic and macroeconomic and bring out some conclusion about this market. Microeconomics: In this section, it will be analyzed into three elements such as demand, supply and price. Demand of consumer: In recent years, the demand of motorbike always grows up.According to the Vietnam Registry Department, until a half of 2011 Vietnam has about 17 million registration motorbikes and became one of countries has the ratio of people who use motorbike highest on the world. Table 2: Number of motorbike was registered Source: Vietnam Registry Department, 2010 Following above table, it can be seen that number of registered motorbike is increasing dr amatically year by year. In 2006, Vietnam had 1. 5 million of motorbikes but 5 year later this figure increased twice with 3 million motorbikes in 2010.These figures are shown that demand of Vietnamese people in buying motorbike very large ND this Is a complex market for Investors to Invest their capital as well as extend production. The main reason leaded to growing up of motorbike is reduced price of this product. For example, 10 years ago, a Honda dream motorbike was 30 million VEND (equivalent 2,000 USED at the same time), however after 5 year Honda was opened a industry in Vietnam and now price of a Honda motorbike is just from 10 million VEND (equivalent KUDUS at the present time). Price of produce changes, therefore demand of consumers change too.On the other hand, the second factor making demand of consumer raise Is national Income. According to General Statistics Offer, average per capita income in 2010 was approximately 1000 SAID, increasing 2. 5 times compare with income in 2004. Slogan (2010) is mentioned that to normal goods when income increases, the demand about it increases. Motorbike is a normal goods. This is sigh to show that when income of people increases, their demand increase too and they will spend more money for necessary goods, such as Vietnam is one of countries where is the most of using motorbike in the world.Thus, Vietnam is a large market and more potential for motorbike brands. Honda is brand which has most of market share in motorbike market because Honda is leader of this market when they were the first production at Vietnam over 10 years ago and they are always on the top of choice of consumers. According to General Statistics Offer, until 2009 there are two industries of Honda in Vietnam and the total of productivity of those is 1. 5 million produces per year.However, in 2010 Honda has invested 70 million USED to expend these industries, and improvement productivity to 2 million produces each year. Look back on the table 2, the number of registered motorbike in 010 was 3 million produces. Therefore, Honda was taken over a half of share market of motorbike market in Vietnam. Yamaha, Suzuki, SUM, Pigging†¦ Are the rest of brands in the motorbike market. In these brands, Yamaha is the most competitor of Honda with productivity each year is 1 million produces.In first years when motorbike has Just come to Vietnam, motorbike brands have set a high price because at that time demand of consumer was increasing highly and the main reason that time was taste. In recent years, with expanding on industries of old brands and setting up new brands of domestic production makes competition violently in motorbike market. As a result, reduce price is the optimal choice of producers. Domestic brands have exposed new produces with lower price, conformity with people who have low income.Therefore, other brands must to reduce price of their produce to competitive if they do not want to lose share market. Producers emul ate reducing price make demand of consumer increasing significantly. However, at this present, the supply of producers is over than demand of consumer, making surplus through the years, so in the future the price of produce will be continue reduce. On the other hand, producers must be kept productivity stability and in next some years reduce productivity to avoid surplus by yearly.

A Pulse Oximeter

This article is therefore intended for the occasional user of pulse oximetry. * Pulse oximeters. Measure the arterial oxygen saturation of haemoglobin. The technology involved is complicated but there are two basic physical principles. First, the absorption of light at two different wavelengths by hemoglobin differs depending on the degree of oxygenation of hemoglobin. Second, the light signal following transmission through the tissues has a pulsatile component, resulting from the changing volume of arterial blood with each pulse beat. This can be distinguished by the microprocessor from the non-pulsatile component resulting from venous, capillary and tissue light absorption. Function of a Pulse Oximeter * The function of a pulse oximeter is affected by many variables, including: ambient light; shivering; abnormal hemoglobins; pulse rate and rhythm; vasoconstriction and cardiac function. A pulse oximeter gives no indication of a patients ventilation, only of their oxygenation, and thus can give a false sense of security if supplemental oxygen is being given. In addition, there may be a delay between the occurrence of a potentially hypoxic event such as respiratory obstruction and a pulse oximeter detecting low oxygen saturation. However, oximetry is a useful non-invasive monitor of a patients cardio-respiratory system, which has undoubtedly improved patient safety in many circumstances.   Pulse Oximeter as part of an anesthetic machine * A portable desktop unit * A finger/mobile pulse Oximeter Indications COPD disease pulse oximetry is useful in stable patients with severe and in patients with worsening symptoms or other signs of an acute exacerbation, as a tool for patients to use at home to assist with their management * Asthma pulse oximetry complements peak flow meters in assessing the severity of asthma attacks/exacerbations and response to a treatment. * Acute respiratory infection pulse oximetry is useful in evaluating the severity of the illness and, in conjunction with other criteria, determining whether and how to refer pa tients for further treatment. What does a Pulse Oximeter Give? Nursing Responsibilities * Pulse oximetry offers an easy and non-invasive measurement of oxygen saturation, but has limitations and practice considerations that every nurse should be aware of. * Oxygen saturation (SpO2) is a measurement of the percentage of hemoglobin molecules carrying a full load of oxygen. Oxygenated hemoglobin (HbO2) absorbs more infrared light than red light, while deoxygenated hemoglobin (Hb) absorbs more red light. By comparing the relative amounts of different light absorbed, the oxygen saturation (SpO2) can be determined. However, there are some possible causes of erroneous readings: †¢Ã‚  Motion artifact: Movement (shivering or tremors) or improper fit of the sensor can cause erroneously low readings. †¢Ã‚  Hypotension (due to cardiac arrhythmias, blood loss or peripheral vascular disease) and peripheral vasoconstriction (caused by hypothermia, smoking or sickle cell disease) can alter readings. Smoke inhalation or carbon monoxide poisoning can cause high levels of arboxyhemoglobin and also skew pulse oximetry readings.   Response delay: A technical limitation that requires additional time to detect hypoxemia (SpO2  less than 90 percent). The length of delay can be affected by poor sensor site perfusion and vasoactive drugs. * Sensors are sized according to weight and it is important to select the correct size to avoid reading errors.

COMPANY LAW Essay Example | Topics and Well Written Essays - 1500 words

COMPANY LAW - Essay Example The deregulatory claims are premised on the view that inside information fosters market efficiency and that granting the property rights to security managers is an efficient compensation scheme. Prohibition of insider trading in European Union is justified on the basis of equity and fairness to all market participants. Generally, both firms, shareholders and the society benefit from the accurate pricing of the securities since it leads to efficient allocation of capital and decreases the volatility of the prices in the market thus attracting the risk-averse investors. The firm will also benefit from the accurate pricing through increase investor confidence in the security and reduction in monitoring costs. According to the proponents of deregulation, insider trading will benefit the society since it moves the price to a level which it would be if the inside information was available to the public. Henry Manne, asserts that insider trading leads to price accuracy thus it is an efficie nt mechanism for compensating the security managers for the release of stock information2. The aim of the new EU rules was address the divergence of the member states in their approach to market abuse3. Variations in the national laws have allowed many security managers to escape prosecution for insider dealing. Some countries even lack the sanction powers while other countries do not have sanctions for certain market manipulation offences. For instance, Bulgaria does not have any criminal laws to govern insider trading while other countries impose only up to five years maximum imprisonment for inside trading related offences. Another problem to the effectiveness of the sanctions is the Bank secrecy laws in some countries. For instance, French authorities have faced challenges in tracing the persons who executed order in Paris Stock Exchange via the Swiss banks. Some of the problematic effectiveness of sanctions includes the gaps in regulation of commodity derivatives, lack of legal certainty of the market abuse directive, the gaps in regulating new markets, platforms and over the counter instruments in the emerging markets. EU Directive 2003/6/EC24 adopted in 2003 updated the legal framework on insider dealing and market manipulation behavior. However, several market, technological and legislative changes have led to changes in the financial landscape thus creating loopholes for insider dealing. The Market Abuse Directive (MAD) faced numerous challenges in curbing insider trading. For instance, Section 3.1.1 of the MAD covered limited financial instruments

An examination of the efficacy of Behavioral Finance Essay

An examination of the efficacy of Behavioral Finance - Essay Example 383) -The weak form hypothesis asserts that stock prices already reflect all information that can be derived by examining market trading data such as the history of past prices, trading volume, or short interest. Numerous papers have demonstrated that early identification of new information can provide substantial profits. Insiders who trade on the basis of privileged information can therefore make excess returns, violating the strong form of the efficient market hypothesis. Even the earliest studies by Cowles (1933,1944), however, make it clear that investment professionals do not beat the market. It has already been stated that an efficient market is one where the prices of securities fully reflect all available information, but then what are the sufficient conditions for capital market efficiency? In an idealized world, such conditions would be The debate about market efficiency has resulted in thousands of empirical studies and literature attempting to determine whether particular markets are in fact ‘efficient’, and if so to what degree. In fact, the majority of studies and researches of technical theories have gone to the result that it is difficult to predict prices. Moreover, the random walk theory indicates that price movements will not follow any trends and so by knowing the past price movements it’s not possible to predict the future price movements. All these state that markets are in fact efficient. However, researchers have also exposed many stock market anomalies that seem to be inconsistent with the efficient market hypothesis. Trading strategies seem to be widespread among fund managers and there is little evidence that they would generate excess returns in practice (Malkiel, 2003). Evidence proof that the use of trading strategies might be closely related to behavioural anomalies. It is impossible to consistently make abnormal returns using a