Network Simulator Essay Example for Free

Network Simulator Essay INTRODUCTION IEEE 802.11 is the de facto standard for WLANs. It specifies both the medium access control (MAC) and the physical (PHY) layers for WLANs. The MAC layer operates on top of one of several physical layers. Medium access is performed using Carrier Sense Multiple Access with Collision Avoidance. However, simple CSMA is susceptible to the hidden node problem, especially in so called ad hoc networks where a node may communicate directly with every other node in range or using intermediate nodes as relays otherwise. Hidden nodes cause costly packet collisions and thus significantly affect network performance. In order to combat the hidden node problem, a mechanism known as Request to Send/Clear to Send (RTS/CTS) handshake is often used. RTS/CTS mechanism is supported in the IEEE 802.11 family of standards. The RTS/CTS mechanism was initially proposed in a protocol called Multiple- Access with Collision Avoidance (MACA). From a network point of view, one of the primary reasons for using the RTS/CTS mechanism is to avoid network congestion resulting from frequent packet collisions. Figure 1 depicts a conceptual â€Å"throughput versus Packet Size† curve for a network. In the presence of congestion, the throughput goes to zero as the Packet Size is increased beyond a certain value. A properly designed network, on the other hand, maintains the maximum throughput as the Packet Size goes to infinity. LITERATURE REVIEW The IEEE 802.11 standard includes an optional feature of the RTS/CTS (Request to Send/Clear to Send) function to control station access to the medium when collisions occur due to the hidden node. This option is also known as virtual carrier sensing. Through the proper use of RTS/CTS, you can fine-tune the operation of your wireless LAN since it solves the hidden node problem and provides additional protection against collisions. If you enable RTS/CTS on a particular station, it will refrain from sending a data frame until the station completes a RTS/CTS handshake with another station, such as an access point. A station initiates the process by sending a RTS frame. The access point (AP) or another station receives the RTS and responds with a CTS frame. The station must receive a CTS frame before sending the data frame. The CTS also contains a time value that alerts other stations to hold off from accessing the medium while the station initiating the RTS transmits  its data. Thus, the use of RTS/CTS reduces collisions and improves the performance of the network if hidden nodes are present. SIMULATION ENVIRONMENT We use Ns-3 as simulation tool. NS-3 is built using C++ and Python and scripting is available with both languages. The ns-3 library is wrapped to python thanks to the pybindgen library which delegates the parsing of the ns-3 C++ headers to gccxml and pygccxml to generate automatically the corresponding C++ binding glue. These automatically-generated C++ files are finally compiled into the ns-3 python module to allow users to interact with the C++ ns-3 models and core through python scripts. Graphical visualization of raw or processed data collected in a simulation is graphed using Gnuplot tool. Our experimental done in Ubuntu 11.10 with installation of all needed tools. Simulation environment based on the command below, sudo apt-get install build-essential g++ python mercurial NS-3 is available in (linux, osx, cygwin, mingw) and we deploy Development version: http://code.nsnam.org/ns-3-dev. The development version is usually stable; a lot of people use it for daily work. RESULT ANALYSIS The results analysis are based on the following factors * Enabling and disabling RTS/CTS * Protocol bases, either UDP or TCP * WLAN standards which are IEEE 802.11a, IEEE 802.11b, IEEE 802.11g * Variation of Throughput, Packet Loss Ratio, Delay with Packet Size and Wifi Nodes. From the graphs below result obtained through the following * Disabling and enabling RTS/CTS * UDP protocol used * IEEE 802.11b standard used * Variation of Packet Size (500-2200) Considering the second result with use of TcpTahoe, TcpNewReno, TcpReno and UDP transport protocols with the following * Disabling and enabling RTS/CTS * UDP protocol used * IEEE 802.11b standard used * Variation of Packet Size Fig. Tahoe 1 Fig. Tahoe 2 Fig. Tahoe 3 Fig. Reno 1 Fig. Reno 2 Fig. Reno 3 Fig. Newreno 1 Fig. Newreno 2 Fig. Newreno 3 Considering the third result for different IEEE802.11 standards (802.11a, 802.11b and 802.11g). * Disabling and enabling RTS/CTS * TCP protocol used * IEEE 802.11a/ IEEE 802.11b/ IEEE 802.11g standard used * Variation of Wifi Nodes Fig. 802.11a (i) Fig. 802.11a (ii) Fig. 802.11a (iii) Fig. 802.11b (i) Fig. 802.11b (ii) Fig. 802.11b (iii) Fig. 802.11g (i) Fig. 802.11g (ii) Fig. 802.11g (iii) CONCLUSION From the result analysis obtained above, it is clearly seen that IEEE 802.11a has better performance compared to other wireless standards due to the following reasons; * Provides maximum data rate of about 54 Mbps. * It operates in 5GHz ISM band. * It is not subjected to interference from other products designed , * It is characterized with higher throughput * It is suited for connectivity provision over densely populated user environment Also from the result analysis above, TCP Tahoe is the best TCP variant due to the following facts; * It is characterized by fast retransmit. * It is characterized by fast recovery. * Reduce congestion window REFERENCES 1. E. Ayanoglu, S. Paul, T. F. LaPorta, K. K. Sabnani, and R. D.Gitlin, â€Å"AIRMAIL: A link-layer protocol for wireless networks,† ACMACM/Baltzer Wireless Networks J., vol. 1, pp. 47–60, Feb. 1995. 2. A. Bakre and B. R. Badrinath, â€Å"Handoff and system support for indirectTCP/IP,† in Proc. 2nd Usenix Symp. Mobile and Location-IndependentComputing, Apr. 1995. 3. S. Keshav, â€Å"REAL: A Network Simulator,† University of California at * Berkeley, Berkeley, CA, USA, Tech. Rep., 1988. * 4. V. Naoumov and A. Gross, â€Å"Simulation of Large Ad Hoc Networks,† In Proceedings of the 6th ACM Workshop on Modeling, Analysis, and * Simulation of Wireless and Mobile Systems, 2003.

Searching in Schools Essay examples -- Education Students Search Illeg

Searching in Schools The U.S. Supreme Court and state courts have very gently both bestowed and limited Fourth Amendment rights upon public school students in a series of cases over several decades. Recent cases may indicate that the delicate balance between student rights and school safety procedures is strongly leaning towards the rights of school authorities to actively isolate and reduce perceived causes of school violence. Starting in 1968 and culminating in 1984, the law of the land concerning the status of students compared to school authorities shifted to a more constitutional basis. Prior to that time, student rights in school were defined by the common law doctrine of in loco parentis, which for centuries posited that school officials were given the right, duty, and responsibility to act in the place of a parent. Their right to act included the power to search students for illegal items, or for items merely considered to be prohibited under state or local law or school district policies, withou t the warrant or probable cause conditions mandated for all other citizens under the Fourth Amendment. State laws, as upheld by their state courts, permitted such school action when, for example, student searches were deemed to be in the best educational interests of all the students. Any search based upon the much lower and non-constitutional standard of right problem was found to be in accord with the doctrine of in loco parentis; it was accepted by the courts as necessary and reasonable in light of public necessity to maintain school discipline and order and the longstanding social concept of the parental powers of school authorities. The searching of students produces a sense of security and safety in schools. Student ... ...ice-type school violence prevention strategies. Law-related education is a fresh approach to reducing the causes of school violence early and continually throughout a students education. It is a generic, interdisciplinary direction to education combining particular kinds of content related to rules, laws, and legal systems with active instruction, flexible to any grade level and intended to continue through all grade level. Its aim is strictly to instill non-aggressive social problem-solving abilities, while also helping students become good citizens. Its method is to integrate into all curricula illustrations of common, student-relevant issues in the context of legal rights and responsibilities. Bibliography: Brownfield, Currie, Margid, McKelvey, Norris, Wade. Rights & Privileges Opposing View Points Green haven Press Inc. San Diego, CA 1990

Coffee and Starbucks

1 A. What is Starbucks’ â€Å"product† †¢Starbucks’ product is a casual experience in a comfortable atmosphere where the customer can enjoy a premium cup of coffee and a newspaper or relaxing conversation with friends. B. What is their â€Å"core product† and what are the â€Å"auxiliary features† and benefits? †¢The core product is a premium cup of coffee. The auxiliary features include the well-educated baristas that can help select the right cup of coffee and help customers learn how to reproduce the experience at home or the office with fresh coffee bean or grounds they can purchase in store. Along with the coffees available there are also Tazo teas, hand crafted espresso and blended drinks a little something for every taste. To go with the drink of your choice you can also enjoy a fresh pastry or a sandwich while listening to music or utilizing the free Wi-Fi to complete the experience. C. What is their â€Å"unique selling proposition† and how do consumers view it now? †¢Starbucks’ unique selling position was offering a high quality coffee for a premium price, while providing a place to relax other than work, home or going to the bar. With their comfortable seating areas and internet access they branded themselves as your â€Å"third place†. Customers bought into it but now that they have started to get more streamlined their stock is falling because they are losing a little bit of that selling position. As the stores get a little less comfortable and become a little more like an assembly line, customers are starting to see it more like a commodity rather than something special. 2. A. Are McDonald’s and Starbucks direct competitors? Yes. While they don’t offer the same quality of food or coffee, McDonalds has put a lot of emphasis on the quality of their coffee and have been able to increase their sales and profits. With the introduction of their McCafe line of coffee drinks McDonalds is looking to take a share of the market from Starbucks. B. What advantages does McDonald’s have in competing with Starbucks for coffee sales? †¢McDonald’s coffee has a very good reputation as a good cup of coffee. While it is not on par with the gourmet coffee and specialties that Starbucks has to offer it is a much cheaper alternative and with the large selection of menu items it can market to a much broader base of customers. For example parents with small children will be drawn to McDonald’s for their coffee because of what they can offer the children that Starbucks can’t. Another advantage is the speed at which McDonald’s can serve customers. Since the coffee and food they serve is less customized they are able to get people in and out at a much faster pace even with the implementation of the drive thru at Starbucks. . A. What changes in society (at the time of the case) helped Starbucks to be successful? †¢There was a steady increase in the number of coffee drinkers in the US in the mid-90s. That combined with the trend of consumers to drink more and more coffee out of the home has increased sales in the entire market. While a large increase of this coffee consum ption was among those that drink coffee at work, the benefit to Starbucks is that they are getting the coffee from somewhere other than the workplace. Along with the increase in consumption consumers have trended to being more and more environmentally conscious. So the focuses on environmentally friendly ways of doing business have helped to keep them in favor with the customers. B. How are these changes related to their target market? †¢Coffee drinkers ranging from 25-29 increased their out of home coffee consumption from 42% to 66% while in the same year 30-59 years old increased from 33 to 46%. 4. A. What are the â€Å"strategic marketing factors† that help to account for Starbucks’ long-term success in developing brand equity? The environment that they offered was one of the big factors that lead to their ongoing success. While there are more and more cafe styled coffee houses coming into the market at this time the idea was very unique and helped to differentiate them in the market. The high quality product and unique sizing of their products also set them apart. Rather than using the standard small med and large names they used unique identifies that helped make their products stand out in memory. Before they came around your options for coffee outside the home were very limited and the ability to get such high quality even at a premium price was a welcome feature in the market place. For the longest time they were really the only player in the space and that niche afforded them very rapid growth and early successes that help fuel even more growth as they expanded worldwide. 5. A. What are the advantages of the Starbucks Card to the company? †¢The most obvious advantage of the card to Starbucks is the guaranteed income. Once people load money on the card it can only be spent at a Starbucks location. It also makes tracking customer purchasing habits and preferences readily available. Then there is the case of the forgotten or lost cards that never get used that equate to pure profit. One last advantage is that with the card they have also created a secondary market for sales by placing the cards in stores like Giant Eagle where people that wouldn’t come into the stores can buy the cards as a gift. B. What are the advantages of the Starbucks Card to the customers? The consumer can control their spending with the card. By loading the card with the amount they allocate for coffee they can track their spending more effectively than before when just purchasing with cash or a random card. While there is no discount associated with the card it does give the consumer some protection when they register the card online. If the card is ever lost or stolen they can report it and a new card will be issued with the same balance and the existing card voided. 6. A. Evaluate Chairman Schultz’ global strategy. Is it â€Å"good† or â€Å"bad? † †¢The global strategy is â€Å"good†. You can build a lot of customer loyalty by taking care of your employees. If your employees are happy and well trained they will provide a much better experience for the customer. Starbucks mission and direction has a solid base in the customer experience as much as the quality of the coffee. So making sure the employees are trained well and very knowledgeable about all things coffee enables them to take the experience past just when the customer is in the store. Educating the customer on how to get the best cup of coffee at home as well will provide you a regular customer for not only their coffee at the office but also the grounds for home. †¢In addition the image they are able to betray as a company that cares about the community and the environment will help build customer loyalty. The fact that they not only work to be environmentally conscious themselves but also work with partners and suppliers to share the information and work together to buy, sell and use environmentally friendly products. B. What recommendations do you have to improve Starbucks’ competitive position domestically? †¢Starbucks needs to stick to what got them here in the first place. Don’t try to become another fast food establishment. Customers that are coming to one of their stores will respect the time it takes to get a high quality cup of coffee. Take that time to cross sell the customer on coffee beans and other goods for the home. While offering food to the customer is a natural evolution for Starbucks it is important that they put as much time and effort into providing high quality food as they do coffee. If they keep the high quality of coffee but serve a lesser food the lesser image will be what is remembered. On the same lines make sure that if you are going to provide places for the customer to sit and enjoy their coffee stick with the comfortable seating that invites the customer to relax and stay awhile. You will not only bring them back time and time again you will encourage them to spend more time in the store every time they visit and therefore increase the opportunities to sell more products. Coffee and Starbucks 1 A. What is Starbucks’ â€Å"product† †¢Starbucks’ product is a casual experience in a comfortable atmosphere where the customer can enjoy a premium cup of coffee and a newspaper or relaxing conversation with friends. B. What is their â€Å"core product† and what are the â€Å"auxiliary features† and benefits? †¢The core product is a premium cup of coffee. The auxiliary features include the well-educated baristas that can help select the right cup of coffee and help customers learn how to reproduce the experience at home or the office with fresh coffee bean or grounds they can purchase in store. Along with the coffees available there are also Tazo teas, hand crafted espresso and blended drinks a little something for every taste. To go with the drink of your choice you can also enjoy a fresh pastry or a sandwich while listening to music or utilizing the free Wi-Fi to complete the experience. C. What is their â€Å"unique selling proposition† and how do consumers view it now? †¢Starbucks’ unique selling position was offering a high quality coffee for a premium price, while providing a place to relax other than work, home or going to the bar. With their comfortable seating areas and internet access they branded themselves as your â€Å"third place†. Customers bought into it but now that they have started to get more streamlined their stock is falling because they are losing a little bit of that selling position. As the stores get a little less comfortable and become a little more like an assembly line, customers are starting to see it more like a commodity rather than something special. 2. A. Are McDonald’s and Starbucks direct competitors? Yes. While they don’t offer the same quality of food or coffee, McDonalds has put a lot of emphasis on the quality of their coffee and have been able to increase their sales and profits. With the introduction of their McCafe line of coffee drinks McDonalds is looking to take a share of the market from Starbucks. B. What advantages does McDonald’s have in competing with Starbucks for coffee sales? †¢McDonald’s coffee has a very good reputation as a good cup of coffee. While it is not on par with the gourmet coffee and specialties that Starbucks has to offer it is a much cheaper alternative and with the large selection of menu items it can market to a much broader base of customers. For example parents with small children will be drawn to McDonald’s for their coffee because of what they can offer the children that Starbucks can’t. Another advantage is the speed at which McDonald’s can serve customers. Since the coffee and food they serve is less customized they are able to get people in and out at a much faster pace even with the implementation of the drive thru at Starbucks. . A. What changes in society (at the time of the case) helped Starbucks to be successful? †¢There was a steady increase in the number of coffee drinkers in the US in the mid-90s. That combined with the trend of consumers to drink more and more coffee out of the home has increased sales in the entire market. While a large increase of this coffee consum ption was among those that drink coffee at work, the benefit to Starbucks is that they are getting the coffee from somewhere other than the workplace. Along with the increase in consumption consumers have trended to being more and more environmentally conscious. So the focuses on environmentally friendly ways of doing business have helped to keep them in favor with the customers. B. How are these changes related to their target market? †¢Coffee drinkers ranging from 25-29 increased their out of home coffee consumption from 42% to 66% while in the same year 30-59 years old increased from 33 to 46%. 4. A. What are the â€Å"strategic marketing factors† that help to account for Starbucks’ long-term success in developing brand equity? The environment that they offered was one of the big factors that lead to their ongoing success. While there are more and more cafe styled coffee houses coming into the market at this time the idea was very unique and helped to differentiate them in the market. The high quality product and unique sizing of their products also set them apart. Rather than using the standard small med and large names they used unique identifies that helped make their products stand out in memory. Before they came around your options for coffee outside the home were very limited and the ability to get such high quality even at a premium price was a welcome feature in the market place. For the longest time they were really the only player in the space and that niche afforded them very rapid growth and early successes that help fuel even more growth as they expanded worldwide. 5. A. What are the advantages of the Starbucks Card to the company? †¢The most obvious advantage of the card to Starbucks is the guaranteed income. Once people load money on the card it can only be spent at a Starbucks location. It also makes tracking customer purchasing habits and preferences readily available. Then there is the case of the forgotten or lost cards that never get used that equate to pure profit. One last advantage is that with the card they have also created a secondary market for sales by placing the cards in stores like Giant Eagle where people that wouldn’t come into the stores can buy the cards as a gift. B. What are the advantages of the Starbucks Card to the customers? The consumer can control their spending with the card. By loading the card with the amount they allocate for coffee they can track their spending more effectively than before when just purchasing with cash or a random card. While there is no discount associated with the card it does give the consumer some protection when they register the card online. If the card is ever lost or stolen they can report it and a new card will be issued with the same balance and the existing card voided. 6. A. Evaluate Chairman Schultz’ global strategy. Is it â€Å"good† or â€Å"bad? † †¢The global strategy is â€Å"good†. You can build a lot of customer loyalty by taking care of your employees. If your employees are happy and well trained they will provide a much better experience for the customer. Starbucks mission and direction has a solid base in the customer experience as much as the quality of the coffee. So making sure the employees are trained well and very knowledgeable about all things coffee enables them to take the experience past just when the customer is in the store. Educating the customer on how to get the best cup of coffee at home as well will provide you a regular customer for not only their coffee at the office but also the grounds for home. †¢In addition the image they are able to betray as a company that cares about the community and the environment will help build customer loyalty. The fact that they not only work to be environmentally conscious themselves but also work with partners and suppliers to share the information and work together to buy, sell and use environmentally friendly products. B. What recommendations do you have to improve Starbucks’ competitive position domestically? †¢Starbucks needs to stick to what got them here in the first place. Don’t try to become another fast food establishment. Customers that are coming to one of their stores will respect the time it takes to get a high quality cup of coffee. Take that time to cross sell the customer on coffee beans and other goods for the home. While offering food to the customer is a natural evolution for Starbucks it is important that they put as much time and effort into providing high quality food as they do coffee. If they keep the high quality of coffee but serve a lesser food the lesser image will be what is remembered. On the same lines make sure that if you are going to provide places for the customer to sit and enjoy their coffee stick with the comfortable seating that invites the customer to relax and stay awhile. You will not only bring them back time and time again you will encourage them to spend more time in the store every time they visit and therefore increase the opportunities to sell more products.

Self Perception - 800 Words

Application: Getting to Know Yourself Application: Getting to Know Yourself By: Meghan Robinson Walden University January 20, 2013 Professor Geidner Robinson 1 My life is influenced by many different attributes not just from cultural aspects. I have had it very rough in life growing up since childhood being raised in a low income town as the oldest girl of four of three other female children; I was forced to grow up fast in life. My mother gave birth to me and all of my sisters in Ansonia, CT which is a small town where just about everyone knows each other and knows your all of your business. My social status was low class but most of the families there were and very few were middle class, but we all attended schools†¦show more content†¦It was tough being eight years old and just wanting to fit in but you stuck out like a sore thumb. It was also hard because I was also exceptionally bright and received a lot of awards so a lot of the children didn’t like me because they said that they thought I was a nerd as well or that I thought I was better than them because I knew more than them. But this was not the case I just simpl y wanted what every child wanted to be liked, loved, and accepted. My teachers took a special interest in me and always gave me extra work and push me beyond the limits because they knew I had special abilities and what I was capable of, this is one the reasons that inspired me to become a teacher. When I was twelve I moved to West Haven, Ct a middle class town with my Grandparents because my mother was not competent enough to raise us. This town was a little better but I was still getting made fun of but this time it was the black kids making fun of me because they said I talked like a white girl. I was so confused about this because I couldn’t understand how you can talk like a color. That was how I was raised to not see color and still don’t till this day. It feels good to reflect on my identity, it makes me realize that I am the person who I am today because of it. I make sure today not judge children and or their families based on any attributes whatsoever, espec ially racial or cultural. I want to make all families feel as comfortable as possibleShow MoreRelatedSelf Perception Theory1700 Words   |  7 PagesSelf perception Table of contents Serial N ° | List of Contents | Page N ° | 01 | Executive summary | 03 | 02 | Theories | 04 | 03 | Techniques | 05 | 04 | Decision making | 06 | 05 | References | 08 | â€Å"Self perception theory† Executive summary:- Self-perception theory (SPT) is an account of attitude change developed by psychologist Daryl Bem. It asserts that people develop their attitudes by observing their behavior and concluding what attitudes must have caused them. 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It has been found that a discouraging familyRead MoreSelf Perception1068 Words   |  5 PagesCase Study 1 Self - perception Project 4 Case Study 2 1.Describe your perception of the situation: This situation has the potential to be awkward, but it is certainly salvageable. I think that mentioning Toya’s high level of responsibility and her ability to be a â€Å"self-starter† was a very good opening to this conversation about her first few weeks on the job. Making an interrogative statement about, â€Å"how Toya could improve her work† was a bit of a mistake in my opinion. It put ToyaRead MoreThe Perception Of Self Efficacy, Perception, And Perception2863 Words   |  12 PagesFrom early infancy, we look to others as a primary source of information about the world. This dependence is so powerful that we often re-evaluate our judgements of self-efficacy, perceptions, as well as comprehension judgements when they contradict others’ judgements, in fear of rejection. The knowledge, evaluation and control of one’s thought processes are often referred to as â€Å"metacognition†. Metacognition primarily pertains to the processes whereb y one estimates and reflect upon one’s awarenessRead MoreThe Perception Of Self Awareness1199 Words   |  5 PagesIn America, our self-image is undoubtedly one of the most important aspects of our daily lives. In an ever-changing world, we are constantly working in the lens of which we believe the world sees us. But is this true of all people? Disparities in self-perception between different groups of people can easily be detected through cultural psychology (Heine, Takemoto, Moskalenko, Lasaleta Henrich, 2008). Perception, especially self-perception, can vary vastly from one culture to another. One perspectiveRead MoreThe Perception Of Self Awareness1215 Words   |  5 PagesIn America, our self-image undoubtedly plays a significant role in our daily lives. In an ever-changing world, we are constantly working in the lens of which we believe the world sees us. But is this true of all people? â€Å"Disparities in self-perception between different groups of people can ea sily be detected through cultural psychology (Heine, Takemoto, Moskalenko, Lasaleta Henrich, 2008).† Perception, especially self-perception, can vary vastly from one culture to another. One perspective that