How Lady Macbeth(TM)s language reveals changes in her role and mental condition Essay

Q: By close reference to the text, show how Lady Macbeth’s language reveals changes in her role and mental condition. In William Shakespeare’s Macbeth, the language of Lady Macbeth clearly reflects changes in her role and mental condition throughout the play. At the beginning, Lady Macbeth’s language is confident and controlled. However, by Act 5 Scene 1, she has undergone a complete transformation of character and is in a pitiful, pathetic condition. Shakespeare uses a variety of literary techniques such as iambic pentameter (or the lack of it), rhetorical devices, powerful imagery and varied sentence lengths to reveal Lady Macbeth’s disposition at different stages in the play. During Act 1, Lady Macbeth’s character is imposing and authoritative. This can clearly be seen by analysing her language and speech patterns. Shakespeare highlights the determination and control of her speech through the use of iambic pentameter. Iambic pentameter is a poetic device, wherein each line has 10 syllables with the emphasis on each even syllable. It is used to create a rhythmic quality and to reflect ordinary speech patterns. In addition, iambic pentameter is also a technique of indicating the control and dignity of a character. In the early part of the play, nearly all of Lady Macbeth’s lines are written in strict iambic pentameter. The lines: † (He that’s coming) Must be provided for, and you shall put This night’s great business into my dispatch, Which shall to all our nights and days to come Give solely sovereign sway and masterdom.†1 illustrate the fact that Lady Macbeth is a cunning, shrewd woman, who is in complete control of her mind. The iambic pentameter, coupled with what she actually says, establishes the fact that she is strong and capable character. Shakespeare leads the readers to come to the conclusion that she has the dominant role in the relationship, as she gracefully takes charge of all the decision-making. This is borne out by the content of the lines as well as the sophisticated vocabulary used. These distinctive character traits of Lady Macbeth may well have been inspired by Shakespeare’s contemporary Queen Elizabeth I, who was also a very commanding and influential entity. Shakespeare also makes use of rhetorical devices to establish Lady Macbeth’s domineering personality. Rhetorical questions, in particular, are heavily used. These are a speech technique used to persuade someone and sway their mentality. In Act 1 Scene 7, Lady Macbeth uses a ton of rhetorical questions to convince Macbeth to commit the regicide of Duncan. Questions such as: â€Å"Was the hope drunk/ Wherein you dressed yourself?†2, â€Å"Art thou afeard / To be the same in act and valour / As thou art in desire?†3, and â€Å"What cannot you and I perform upon / Th’unguarded Duncan?†4 are used to incite Macbeth and make him feel guilty. She is overly vituperative and malicious; accusing him of cowardice by saying things like he’s not a man, or that he doesn’t truly love her because he isn’t keeping his promise to her. The result is that she successfully manipulates Macbeth into doing something that she wants. This confirms the fact that she is an intelligent, influential woman. Another literary device that shows Lady Macbeth’s evil persona is the strong imagery used in her speech. Imagery is a technique used in literature to make the reader visualise a picture in their minds. The lines: â€Å"look like th’innocent flower/ But be the serpent under’t†5 creates a distinct image of trickery and deceit, and gives a clear reflection of Lady Macbeth’s character. Another piece of effective imagery is the lines: † I have given suck and know How tender ’tis to love the babe that milks me: I would, while it was smiling in my face, Have plucked my nipple from his boneless gums And dashed the brains out, had I so sworn.†6 The above lines form a rather disturbing image in our minds, and give us a terrifying indication of Lady Macbeth’s mental strength. It highlights the malevolence that is inherent in her personality, in addition to her determination and her willingness to make sacrifices. However, the nature of such a statement does provoke one to think seriously about Lady Macbeth’s sanity. No person in their right mind would kill a child with the brutality that was described, especially not the child’s own mother. The lines shown above are one of many subtle hints of flaws in Lady Macbeth’s character which Shakespeare intelligently incorporates. These serve as inklings towards the total collapse in her character and mental state that is about to follow. In Act 3 Scene 4, the rapid decline of Lady Macbeth begins to take shape. In contrast to the early scenes of the play, her sentences become very short and she seems emotionally exhausted. Earlier, she would make long, influential speeches, which boasted of control and supremacy. This is not the case any more, although she does regain some composure by continuing to speak in iambic pentameter. She is now content to let Macbeth do the bulk of the talking. This indicates a reversal of roles where Lady Macbeth is no longer the dominant partner in the relationship. She is excluded from decision-making, as shown by Macbeth’s killing of Banquo without even bothering to consult his â€Å"dearest partner of greatness.†7 This scene is quite a significant one, as it marks the turning point of the deterioration in Lady Macbeth’s role and mental state. By Act 5 Scene 1, the language of Lady Macbeth has completely disintegrated. She is ridden with guilt and remorse, and this clearly affects her conscience immensely. Her psychological weakness at this point is illustrated by the use of prose, as opposed to iambic pentameter. This implies that Lady Macbeth has thoroughly lost all control and power which was typical of her in the first few scenes of the play. Her speech, which now mainly consists of incoherent phrases like: â€Å"Out, damned spot! Out I say! One, two. Why then ’tis time to do’t. Hell is murky†8, lacks the equanimity that she possessed in Act 1. She also uses a lot of imperatives and exclamations like â€Å"O, O, O,†9 which show that she is uneasy and deeply distressed. She dwells over the murders committed by herself and Macbeth, making it obvious that these incidents have been haunting her and causing her much disquiet. All the stress that had been bottled up in her mind is released while she is sleepwalking, and by the end of the scene, she is in a dismal condition, muttering a whole lot of useless drivel. It is no surprise that she later decides to do away with herself, as her body and mind have both crumbled to bits. Lady Macbeth’s language visibly reflects her role and mental state at different parts of the play. At the start, she is shown to be powerful and domineering which is demonstrated by uses of iambic pentameter, rhetorical devices and strong imagery. She undergoes a steady deterioration and by the end, she is weak and depleted, as reflected by the breakdown of her language. The stark contrast between her mental state at the start and end of the play is clearly demonstrated by comparing two sentences spoken by her at these times: â€Å"A little water clears us of this deed†10 when her hands are covered in blood after the killing of King Duncan, and â€Å"Here is the smell of blood still, all the perfumes of Arabia will not sweeten this hand†11 while she is sleepwalking. The remarkable fall from grace of Lady Macbeth is wonderfully presented by Shakespeare, and plays a big part in the play as whole. Since it was Lady Macbeth’s ideas and persuasive techniques which led Macbeth to the throne, and set the foundations of his reign; her weakening, and subsequent death, is one of many indicators of Macbeth’s imminent downfall. Shakespeare’s use of various literary devices was excellent, and he is able to successfully draw attention to the decline of Lady Macbeth, and its overall significance. 1 Act 1 Scene 5 – lines 64-68 2 Act 1 Scene 7 – lines 35-36 3 Act 1 Scene 7 – lines 39-41 4 Act 1 Scene 7 – lines 69-70 5 Act 1 Scene 5 – lines 63-64 6 Act 1 Scene 7 – lines 54-59 7 Act 1 Scene 5 – lines 9-10 8 Act 5 Scene 1 – lines 30-31 9 Act 5 Scene 1 – line 43 10 Act 2 Scene 2 – line 70 11 Act 5 Scene 1 – lines 42-43

Average ACT Score - which one matters to you

Average ACT Score - which one matters to you SAT / ACT Prep Online Guides and Tips You're probably curious about how you stack up against average ACT scores. But how many types of averages are there, and which averages are important for you? How about the national average ACT score? Or ACT score averages by gender and by ethnicity? We'll discuss official results for all these questions and tell you which ACT average actually matters for your future. What is the ACT average score? That depends on which group of students you're looking at.We'll look at national averages, averages by gender, and averages by ethnicity. Then we'll discuss which average ACT scores actually matter to you. National Average ACT Score The national average for the ACT stays roughly the same from year to year. For the graduating class of 2014, the ACT reported 1,845,787 total test takers. These were the average scores by section, and as a composite score: Composite: 20 English: 19-20 Math: 19-20 Reading: 20-21 Science: 20-21 All scores reported are the 50th-percentile score, meaning half the students scored above this number, and half scored below. If you scored the national average of 20 composite, you have a decent selection of schools that you have a great chance of getting into. If you raise your score by just a few points, this can make a huge difference in the schools that you're likely to get into. Now a few more ACT average scores for curiosity: Average ACT Scores by Gender Students Percent English Mathematics Reading Science Composite Males 856,651 46 20.0 21.4 21.1 21.2 21.1 Females 977,127 53 20.7 20.5 21.5 20.5 20.9 Interestingly, just like the SAT, boys tend to score higher in mathematics and science, while girls score higher in English and reading. Of course, these are national averages - just because you're a particular gender has little influence on the score you'll receive. It's much more up to the individual - if you stay motivated and prep for the ACT, you can earn a high score. Average ACT Scores by Ethnicity When registering for the ACT, the College Board allows students the option to specify their ethnicity. Most students do share their ethnicity, and the ACT has reported average scores across ethnicity: Ethnicity Students Percent English Mathematics Reading Science Composite All Students 1,845,787 20.3 20.9 21.3 20.8 21.0 Black/African American 241,678 13% 15.8 17.2 17.3 17.0 17.0 American Indian/Alaska Native 14,263 0.8% 16.6 18.1 18.4 18.3 18.0 White 1,038,435 56% 22.0 22.0 22.8 22.1 22.3 Hispanic/Latino 281,216 15% 17.7 19.2 19.1 18.8 18.8 Asian 80,370 4% 22.8 24.9 22.8 23.2 23.5 Native Hawaiian/Pacific Islander 5,676 0.3% 17.5 19.2 18.7 18.6 18.6 Two or more races 70,013 4% 20.6 20.9 21.7 21.0 21.2 No response 4,136 6% 20.0 20.7 21.1 20.5 20.7 Once again, take this information with a huge grain of salt. While there are score differences by ethnicity, these are very rough metrics that may not apply to you. Because these are national averages, it ignores the ability of you as an individual to exceeds the average. Just by searching for this information, you're already outperforming doing more than what most students do to learn about the ACT. Now we get to the real question - which average ACT scores actually matter for you? The answer is: Average ACT Scores for Your Target Colleges The average ACT score that you should care about is the average ACT score at the colleges you're planning to apply to. If you're applying to selective colleges like those in the Ivy League, you'll need to score much higher than the national ACT score average of 20. Likewise, if you're applying to local community colleges, you may not need to score as high as 20 on the ACT. Your score target is unique to you, based on the schools you're interested in. We're going to take you through an easy process to figure out what ACT score you need to aim for, based on just 10 minutes of work. Step 1: Download this Worksheet To work through the following steps, we'll be filling out a worksheet for all the schools you're planning to apply to. Click here to download it, or click the image below. I recommend you print it out so that you can write on paper and keep it next to your work space. Step 2: Fill in the schools you want to get into in the first column. Include your reach schools (or schools that you have a smaller chance of getting into). Don't include your "safety schools," or schools that you're 90% sure you'll get into (because you're likely already scoring well enough to get into those schools). If you don't know what schools you're aiming for yet, feel free to use ones that have been suggested to you, or schools that your friends are interested in. I recommend that you take the time to research schools first, though, so that we have a realistic target score. Step 3: For each school, Google for "[name of school] average ACT". For example, if I'm interested in U Alabama, I'll do the following search: Most schools will have an about.com link or the school website, as shown here. Either page will usually list the25th/75th percentile scoresfor current U Alabama students. As a reminder of what this means: 25th percentile means that 25% of the students attending have a score at or below that number (this is below average). 75th percentile means that 75% of students have a score at or below that number. In essence, this covers the middle 50% of all students admitted to U Alabama. If you score at the 75th percentile for any school,you have a great chance at getting in. If you're at the 25th percentile, you'll need to have a strong application to boost your odds of getting in. Fill out the worksheet this way for all the schools on your list. Step 4: Calculate your Final ACT Target Score Finally, take the average of both columns - 25th percentile, and 75th percentile. I recommend that youuse the 75th percentile average as your target score.If you achieve this score through hard work, you'll have a very strong shot at getting into many of the schools on your list. For you, this is what your "Average ACT score" should be. It's unique to you - not the nation at large, and not your state or gender average score. Finally, you should set a target for your score for each section. My suggestion would be to use the composite score for each section. If you're applying to engineering schools or as a science major, your math and science scores can be higher than your other sections. Similarly, if you're applying to liberal arts programs or as a humanities major, your English and Reading scores can be higher. Step 5: Share Your Target Score As a last step, I suggest that you do two things with your score target: Share it with your parents. This will be a helpful conversation around your personal goals and how you want to achieve your target ACT score. Tape it to your wall. This will keep your goal in mind so that you can guide your studying powerfully. What to Do Next: Is the ACT easier than the SAT? Read to learn the details. Get a free guide to improving 4+ ACT points. Find out the best ACT test dates and build your personal testing schedule. Check out our online ACT prep program.We have a 4 point improvement guarantee - if you don't improve your score by 4 points, you get every penny of your money back. Plus, you get a 5-day free trial, so if you don't feel that it's helping you, you can cancel at any time.

CRM Essay Example | Topics and Well Written Essays - 1250 words

CRM - Essay Example On the other hand, with the customer centric view, it is possible to develop or emphasis on the customers through better communication. Moreover, in order to be efficient, organisations are needed to improve the existing and newly emerged strategies as well as the technologies in order to satisfy customers with better quality products at affordable prices (Sumathi & Sivanandam, 2006). There are apparently ten critical success factors that can be evidently observed and can be considered as significant while initiating a CRM program which includes the establishment of measurable business goals, alignment of the operations of business and information technology. Another factor which can be identified includes receiving support from the executives along with driving the objectives of the business with support from the functional point of view. Another crucial factor is reducing the aspects of customisation by leveraging unnecessary aspects, using trained and experienced employees for CRM, ensuring active involvement in designing and receiving solution by the end users. The other crucial factor which is observed entail investment in training process for empowering employees, usage of phased rolled out schedules and measuring as well as tracking the performances of the employees while conducting a CRM program. The description of the above mentioned factors has been ela borated in the context below: The driving force of CRM can be identified as technology. If the emerging effective advancements of technology are incorporated in the business activity, the business can be operated smoothly with greater productivity along with customer satisfaction. In order to attain customer satisfaction by a considerable extent, it is the responsibility of the organisation to inject technical employees in order to effectively carry out the process of

Hospital Administartion Essay Example | Topics and Well Written Essays - 750 words

Hospital Administartion - Essay Example Within the context of what was previously mentioned, Sentara offers a variety of services, for patients ranging from newborn to elderly, and in almost every field. Sentara has also focused on providing first aid, as it pioneered the first air ambulance service in the region called Nightingale, as well as implementing new protocols in 2000 that dramatically improved the survival rate and lowered the effects of stroke. Also, in 2006, it implemented the 12-Lead EKG system that enabled doctors in Sentara hospitals to receive EKG's from paramedics on route to the hospital. While providing both inpatient and outpatient services, it should be mentioned that Sentara has focused the past years on several fields, improving their methods and technology. These fields include oncology, cardiology and urology. Oncology is an ever developing field, and Sentara managed to develop their methods and expand the scope of their treatments to provide the best care for its customers. In 2000, it implemented a computer-aided detection system for breast cancer, revealing cancers earlier, and therefore improving the effectiveness of treatments. It also implemented several systems in 2002 for a better effectiveness of radiation treatments, such as stereotactic radio surgery, Intensity Modulated Radiation Therapy and brain wafers, all with the purpose of effectively delivering chemotherapy and radiation treatments to tumors without damaging surrounding tissue. In addition, in 2005 it is the first healthcare network in the region to use the recently approved FDA chemotherapy ViaCirqO method for treating abdominal cancers. Sentara also implemented certain revolutionary surgical techniques in treating cancers. In 2002, the Zeus surgical robot was used to treat prostate cancer, making small incisions and m inimizing scars. From 2004-2007 has been implementing the Da Vinci surgical robotic system that has been implemented in several aspects of thoracic, urinary and oncologic surgery, reaching the number of 500 surgeries performed in 2007 since its implementation. As cardiovascular diseases are the leading cause of death in the United States, Sentara has also focused on perfecting the procedures and machinery involved in treatment of such diseases. Procedures like transmyocardial revacscularization that increases the blood flow to the heart is beating-heart bypass surgery is one of the many techniques utilized by the physicians. In 2002, Sentara performed the first adult congenital atrial septal defect interventional repair. In 2004, this procedure was improved even further, by pioneering a new transcatheter technique, reducing patient's recovery time from 6 weeks to 2-3 days. It also pioneered several new devices in the region, such as the HeartMate II, which is a device assisting in transplants in 2005, and a latest in CT and MRI technology in 2007 in order to better detect cardiac tumors, septal defects and the percent of damage after a heart attack. Urology is also one of the more prominent areas of healthcare that Sentara focuses on. They provide the InterStim therapy, which is a rare procedure throughout the hospitals in US, and just recently made available for patients. It is also the healthcare

Neighborhood research assignment Ozone Park Queens Essay

Neighborhood research assignment Ozone Park Queens - Essay Example Later on it was developed by music publisher and developer Benjamin W. Hitchcock and his partner Charles C. Delton. The called the region â€Å"Ozone Park,† because the gentle, fresh air current blew continuously from Jamaica Bay and Atlantic Ocean. The inhabitants are from various ethnic groups such as German, Irish, Eastern European as well as immigrants from Caribbean and Latin America. When the transportation was developed in the region the population started increasing and between the year of 1921 and 1930. As per the data collected in 2010, the population of Ozone Park is 37,087 people. If considered the population growth of this region, it is 3.90 percentages. The average age of the population, is 33.68 years. Population density in Ozone Park, Queens is 33,453/sq.mtr. The population in gender is divided in following way: According to the jobs 74% people are involved in white collar jobs whereas 25% people are involved in blue collar job. In Ozone Park 30% of people are in the age group between 0 and 17, 30% of the population is between 18 and 44 age group and 5% population consists of the people who have crossed the age of 65. The following chart shows the population of various groups of people staying in Ozone Park. The population of Ozone Park, Queens is growing rapidly. ... South border is South Conduit Avenue while the east is 108 Street. Ethnicity of Ozone Park The population of Ozone Park consists of many immigrant groups. The contribution of German and Irish people is substantial in this region. These ethnic groups occupied Ozone Park in the late 19th century and early 20th century. By 1910 Italian people were supposed to be one of the largest ethnic groups in the neighbourhood. They started migrating from New York to Ozone Park. Since the beginning, Ozone Park is captured by the immigrants. At first the Italian people came and settled down there. Ozone Park is known as Little Italy, it is because of its remarkable Italian population. Though the Italians are dominant, in the past few years the other people also are coming and settling down in this region. Among them some immigrants are from South Asia, South America, and West Indies. All of them have brought their cultures with them and thus the land has become cosmopolitan and multi-cultured. Such diversity in culture has made Ozone Park one of the fastest growing as well as ethnically diverse lands in New York City. The African American group also has spread all over the neighbourhood. While describing the ethnic diversity, Jerome Krase and Ray Hutchison say, â€Å"Richmond Hill is the residential and commercial center of a vibrant and expanding Indo-Guyanese and Indo-Trinidadian community concentrated in South Central Queens including neighbouring Ozone Park, South Ozone Park, and Jamaica. Indo Caribbean are descendents of Indian migrants who lived in the Caribbean nations of Guyana, Trinidad and Tobago, for well over 100 years.† (Jerome Krase and Ray Hutchison, 2004) Here in this region one can find the

Change Theory Assignment Example | Topics and Well Written Essays - 500 words

Change Theory - Assignment Example Some of those steps include; unfreezing, refreezing and changing. Based on the nature of change that needs implementation, I believe it is an ideal theory, which can enable the changes to be effectively implemented. Thus, to ensure that the new technique of reporting is effectively implemented with positive results, I settled for a participative leadership style to steer the team to embrace the change in question efficiently. The reason why this leadership style stood out from the rest in ensuring the said changes are implemented is because it is involves the whole team thus denoting a democratic notion whereby each member feels his/her opinions are respected. This style requires all the team members to participate actively in decision making by airing out their views, before the final decision is communicate by the participative leader (Burke, 2010). Therefore, this will tend to boost the morale of the team members in ensuring the new changes are successfully fully implemented since they will be part of the decision-making body. In addition, the participants will develop a sense of contentment since they will view the democratic nature of this leadership style being ideal as each and every opinion that they propose will be considered hence forming a portion of the final decision that will be implemented. That notwithstanding the participative leadership style will ensure a positive response to changes by the team members as they will not reject those changes since they are part of the team that came up with the decisions thus it will be their obligation to embrace them since it is their own making. Thus, this having been said it is prudent to say that the changes will be positively implemented successfully since it will be a common initiative of the whole team rather than an individual’s making (Burke, 2010). The Kurt Lewin theory of change is ideal in implementing this

Survey on the WIFI Positioning Technology

Survey on the WIFI Positioning Technology A quick survey on the WIFI positioning technology Abstract Wireless location estimation technology is applied largely into many fields such as in the military communication, Internet of things and social networks. Meanwhile, with the growing need of WIFI technology, access points of WIFI networks have been deployed in large-scale department stores, cafes, schools and general hospitals. WIFI location positioning can not only offset the drawbacks of GPS especially in built-up area or indoors environment but also enlarge the location estimation services in the relevant industrials. Specifically, more accurate result is the main contribution of the WIFI positioning. Based on WIFI location estimation technology, this survey will present different kinds of approaches applied in WIFI positioning, give a comparison among them and discuss certain algorithms in fingerprint technology. Key words: WIFI technology, WIFI localization, location positioning algorithms 1 Introduction With the high development of Wireless Communication and the urgent need of Personal Communication Service, different kinds of wireless networks has emerged such as GSM, WCDMA, TDSCDMA based on Cellular Technology, Wi-Fi based on AP coverage, etc. Diverse wireless network has different features and can also bring about a wide variety of data services which can satisfy the user for their own communication need. Largely, it can offer us high quality of communication experience and alter our way of life. In the same time, the rapid growth of the wireless communication make the social networks popular among the young generations. Location estimation technology will also make a great contribution to it. In advertising services, as long as the detailed location coordinate of the mobile users is once determined, it will bring about enormous economic benefits to the surrounding business. Business owners could send advertisements to consumers nearby to make more profit. The positioning technology could make public security services more completed. For example, it can aid us to find lost articles, stolen bicycles and missing children or pets. Furthermore, for large manufactures, Location estimation technology could offer the detailed position information of each product components. As for tourists, it can provide travelling information, too. Even in museums, campus and large amusement parks, users could also take the advantage of this location services. With the WIFI technology being applied into many fields, access points of WIFI networks are covered in large commercial buildings, cafes, schools, grand hospitals, bus stops and metro. WIFI positioning technology could make up the limits in indoors environment of GPS. It can not only improve the accuracy of location estimation but also cut down the cost of coverage, which is significant to the society, 2. Different approaches applied in WIFI positioning In terms of positioning technology, the most popular one is GPS. However, the environment should be flat and open. As for indoors regions, GPS technology has a relative poor accuracy in location estimation due to the fact that influenced by the building walls and other subjects, the intensity of signal is attenuated largely. Therefore, WIFI position technology could be an optimized choice for indoors environment. 2.1 The definition of the WIFI positioning Localization is the process of estimating absolute or relative position of mobile objects, referring to the data of predefined spots’ position in restricted area. [1] In indoors environment, WLAN is the ideal option to localize the terminals. The access point just like the bases in wireless communication play a significant role in WIFI positioning. Therefore, WIFI could provide the larger coverage as well as make the localization more convenient. 2.2 The classification of the approaches in WIFI Localization Currently, the majority of WLAN is using the Radio Frequency to communicate with each other due to the fact that most Radio Waves could penetrate walls or obstacles in indoors environment. To be more specific, RSSI is the common localization technology to be applied in wireless environment. [2]The following gives a simple description of RSSI. RSSI (received signal strength indication): Research and experimental measurements show that wireless signal in propagation presents some rules as followed: Once the transmission power of AP is fixed, there is an inverse relationship between the receiver’s received signal strength and distance between sender and receiver.[3] Specifically, if the distance between them is closer, the stronger received signal strength we will get. By using the known radio propagation model, RSSI method could measure different RSSI of APs from mobile terminals. In most cases, we could get the positioning result through three different APs. Therefore, positioning approaches based on RSSI could be classified into two fields: one is trilateration positioning and the other is fingerprinting positioning. 2.2.1 Trilateration positioning technology Trilateration positioning technology means setting the 3 APs to be the center and the distance between AP and to be localized subject to be radius. Therefore, we get the 3 different circles and the focus among them. By using the above data, we could attain the equations to work out the distance of the solution. In WIFI networks, the distance between AP and user could be attained by two approaches. 1. TOA (time of arrival): TOA is measuring the one-way propagation time between the AP and mobile terminals or the round-trip propagation time. [4]The former needs to record the precise signal transmission time of the AP or mobile terminals.Fig.3-1 shows the basic idea of TOA positioning approach. Moreover, the receiver is highly depend on the clock, too; the latter don’t worry about the synchronization. However, there are still high demands on the clock. Fig.2-1 The schematic diagram of TOA approach Yet, TOA is highly depend on accurate time clock. During the localization, 1ms of the measuring error could result in the 300m positioning mistake. Therefore, for the AP and mobile terminal there are high demand on precise clock, which increased the localization hard ware costs. 2. TDOA (time difference of arrival): Different from TOA, TDOA is to detect the arrival time difference between the two APs other than the absolute arrival time for the target terminal localization[5]. Fig.3-2 describe the basic schematic diagram of TDOA approach. Obviously, via this approach, we can minimize the high demand of the synchronization between the sender and receiver. By using the three different AP, it is easy to measure two TDOA values. The mobile terminal is located on two hyperbolic intersection determined by the two TDOA. Fig.2-2 The schematic diagram of TDOA approach 2.2.2 Fingerprinting positioning technology Similar to the traditional fingerprint technology, fingerprint technology relies on characterizing the feature of the database to identify the target.Fig.3-3 gives a detailed description of the working principle in finger printing technology. [6]There are two stages in the localization: training stage and positioning stage. Training Stage: The target in this stage is to build a fingerprint database. First, we should adopt a reasonable reference point distribution for ensuring to provide enough information in the positioning stage. Then, It is important to measure the value of RSS in different reference points. [11]The location information of reference points and the corresponding MAC address are recorded in the database. Due to the environment factor, wireless signal strength is not stable. In order to overcome this disadvantage, generally, we take the average of multiple measurements at each reference point. Table2-1 below indicates the establishment of the fingerprint database. Table2-1 An example of the fingerprint database Positioning Stage: Once the database is settle down, according to the certain matching algorithms, the RSS value of the target point is compared with known information in the database. The common matching algorithm is Nearest Neighbor algorithm (NN) , k-Nearest Neighbor algorithm and so on. These approaches will be discussed thoroughly in the next part. At last, we could attain estimated user location. Fig.2-3 The schematic location positioning technology in fingerprint The above is some basic approaches in WLAN based indoor location estimation technology. The table 2-2 blow presents a brief comparison among them. Table 2-2 the comparison among the different approaches in WLAN based indoor environment 3. Location Algorithms in fingerprint technology In this section, we will introduce two classical positioning algorithms based on fingerprint technology: Nearest Neighbor (NN) algorithm and Naà ¯ve Bayesian algorithm. 3.1 The Nearest Neighbor algorithm (NN) NN could be regarded as a special case of KNN algorithm namely k=1. KNN approach is first introduced in early 1950s. Within the large amount of training set, it is computationally intensive. From then on, it is applied rapidly in the field of pattern recognition.[8] NN is based on analogical learning. To be more specific, we could attain the result by comparing the given test examples and resembled training samples. In the field of wireless location estimation, the test samples are fingerprint and the class label is the physical location corresponding to the fingerprint. [9]Supposed that if the number of fingerprint is l (denoted as ) in the localization area, there is a mapping relationship between each fingerprint and the corresponding physical location information}.In the real-time positioning stage, one RSS fingerprint example is denoted as S. It contains average RSS value from N different APs, namely .In the fingerprint database, each fingerprint is expressed as. is the fingerprint of No.i, which contains the average value of RSS in No.n AP. Therefore, the similarity between the fingerprint S of the real-time signal and the training samples in the database could be measured by the distance between them, for instance, the Euclidean distance. Just like the formula 3-1 below: Finally, for the fingerprint S of the real-time signal, the estimated result is the physical location corresponding to the fingerprint which is the nearest one from it. Shown as formula (3-2). 3.2The Naive Bayesian Algorithm The naà ¯ve Bayesian algorithm is based on the probability method deriving from classification in statistics.[10] Bayesian classification could predict the likelihood of the class members, for instance the given sample belongs to a particular class. The main idea of Bayesian classification is that in many applications, the relationship between the samples and class labels is not determined. In other words, though the test samples are very similar to some training samples, we couldn’t predict the class label clearly. The noise leads to this situation or other confounders which affected the classification didn’t be contained in analysis. Different from KNN, Bayesian classification gives the probability of test samples belonging to the certain class other than the exact class label of test samples. Based on Bayes Theorem, Bayesian classification is a statistic principle which combines the prior knowledge and new evidence gathered from the new data set. Naive Bayes is the impletion of the Bayesian classification. The localization based on naive Bayesian is as followed: First, supposed that there are l fingerprints in the localization area, denoted as , there is a mapping relationship between the each fingerprint and the corresponding group of location information. In the real-time positing stage, a RSS fingerprint sample is denoted as S and it contains average RSSI value from n different APs,Then, naà ¯ve Bayesian algorithm is to attain the posteriori probability of real-time RSS fingerprint samples S in the positioning area, it could be described as below: In the formula (3-1),with the known location,is the conditional probability of real-time RSS fingerprint sample S.is the prior probability of Li in the localization area. Generally, users could appear on any position of the location area. So we consider is subject to the uniform distribution. The key assumption of Naive Bayesian is that the impact of each attribute value for a given class is independent of the other property values. In other words, in certain location, the RSSI value from different APs is independent and unrelated. Therefore, the calculation of is simplified as We could use Gaussian probability distribution to approximate the RSSI in certain location, the formula is as below. Eventually, by using the MAP, we estimate the use’s location, described as formula(3-3). 4. Conclusion and Future prospects Based on WIFI positioning technology, this survey analyze the needs of wireless localization, classify and compare the different approaches implemented in indoor environment and present two classical algorithms in fingerprint technology. With the high development of WLAN, the technology based on RSSI, especially fingerprint attracts more and more attention. On the basis of the more accurate estimated result, the future research goal is to improve the ease of use in the positioning system and make the location-based services more convenient and more practical. Here are some tips towards the future research fields: The fingerprint technology algorithm its self has the drawbacks of enormous complicated preparation works. By using the propagation model, we could reduce the large amount of working preparations. Most people study or work in indoors environment. So, how to use other people’s information to improve the user’s own localization accuracy is an interesting issue and many researcher has put emphasis on it. Recently, most algorithms are just in theoretical research or basic test scene lacking of practical application consideration. Therefore, how to implement these algorithms into public paces is another urgent issue, too. References N0HA S, LEE W J, YOUNG J. Comparison of the mechanisms of the Zigbees indoor localization algorithm[C], Ninth ACIS International Conference on Software Engineering, Artificial Intelligence, Networking, and Parallel Distributed Computing. Phuket, [S.l.]: [s.n.], 2008: 13-18. ZHUMinghui,ZHANG Huiqing. Research on model of indoor distance measurement based on receiving signal strength[C].2010 International Conference on Computer Design and Appliations. Qinhuangdao, [s.l.]:[s.n.], 2010: 54-58. K.C.Ho,Y.T.Chan.Geolocation of a known altitude object from TDOA and FDOA measurements[J]. IEEE Transactions on Aerospace and Electronic Systems, 2007’ 33(3): 770-783. Binghao Li, Yufei Wang, Hyung Keun Lee,ect.A New Method of Yielding a Database of Location Fingerprints in WLAN,IEEE Proceedings Communications. 2005. pp.580-586. Bahl P, Padmanabhan VN. Enhancements of the RADAR User Location and Tracking System. Technical Report MSR-TR-2000-12, 2000. Yongliang Sun;,Yubin Xu, Lin Ma, Zhian Deng, KNN-FCM hybrid algorithm for indoor location in WLAN , Power Electronics and Intelligent Transportation System (PEITS), 2009.pp.251-254dd. Roos T, Myllymaki P, Tirri H, et al. A Probabilistic Approach to WLAN User Location Estimation. International Journal of Wireless Information Networks, 2002, 9, 155-16.