Implementation of User-Pairing Algorithm for OFDMA

Implementation of User-Pairing Algorithm for OFDMA Table of Contents (Jump to) Introduction Literature Survey Problem Formulation References CHAPTER 1:  INTRODUCTION Introduction Orthogonal frequency division multiple access (OFDMA) is an encouraging technology that supports high data rate transmission. The blend of OFDMA with the relay technology has expanded a large extend of potential to develop the overall network performance, and therefore has received a lot of intension in the recent years. Network resources that may include bandwidth and transmission power are limited; hence how to efficiently and fairly allocate these resources to users with guaranteed quality of service is a key issue. The models used while dealing with the partnering problem usually involve some form of orthogonality across the user pairs, so that the pairs can cooperate without causing interference to each other. OFDMA, has a lot of essential properties due to which it has gained a lot of acceptance and popularity in the recent years, and because of its orthogonal structure it is considered as a good candidate for realizing practical cooperation. As we already know that huge amount of research is done on sub-channel and power allocation schemes for OFDMA. Yet, encoding techniques, and resource allocation for mutually cooperative OFDMA systems, have not been investigated much until rather recently. For cooperative OFDMA systems containing only two users, achievable rates based on mutual cooperation across sub-channels were characterized in [3], and for such systems, optimal power allocation algorithms are used. Relay-assisted cooperative communication Relay-assisted cooperative communication has turn out to be very effective in several wireless systems [1]. This communication system is capable to enhance the overall system performance that includes spectral efficiency, network lifetime and coverage area. Efficient wireless resource allocation is critical to fully realize these benefits in cooperative communication systems. Resource allocation in orthogonal frequency division multiplexing (OFDM) based relay communication systems involve even more technical challenges. Single-hop OFDM or OFDMA which are traditional systems when compared then we must carefully and accurately coordinate the power and subcarrier allocations across different hops resulting from multiple relays. Compared with single-carrier relay systems, in this we are able to assign multiple orthogonal subcarriers in every single hop, which not only gives more design freedoms but also typically higher design complexity or intricacy. In this paper, we will take a close look on the power control problem, joint relay selection, and subcarrier assignment for a cooperative two-hop multi-relay OFDM system using the protocol called amplify-and-forward. The main aim is to make the most of the transmission rate subject to an individual power constraint of each transmit node. Recently, a number of results have been described on relay selection in two-hop multi-relay systems. A common selection strategy is to choose the relay with the best equivalent end-to-end channel gain. Similar strategy can be used in OFDM systems, where a relay is selected based on the channel condition of the whole OFDM symbol. However, such symbol based relay selection may not be efficient as the differences of channel conditions amongst diverse subcarriers are not completely utilized. The subcarrier-based relay selection, which selects one best relay for each subcarrier, was then proposed to exploit both frequency diversity and node diversity. [2] Two-way relay network In this type of network, two users or operators communicate with each other via one or multiple relays. There are three two-way relaying protocols which differ in the number of required phases. The first protocol is called as the simple four phase protocol consisting two one-way relaying protocols. The second protocol is named as the time-division broadcast (TDBC) protocol which consists of three phases. The third protocol is the multiple-access broadcast (MABC) protocol which consists of two phases. The MABC protocol is more bandwidth efficient compared with the other two protocols. Orthogonal frequency division multiple access (OFDMA) is one of efficient techniques to mitigate the problems of frequency selective fading. In an OFDMA network, a complete obtainable bandwidth is separated into a number of orthogonal subcarriers and multiple users transmit their information simultaneously using the different subcarriers without inter-user interference. Generally, it is assumed that the bandwidth of each subcarrier is much smaller than the coherence bandwidth of the channel, and so the channel of each subcarrier has a flat fading. In addition, the OFDMA network uses the method of adaptive resource allocation and thus delivers improved performance [4]-[5]. In a two-way OFDM relay network having a single user pair and a single relay, the sum capacity for both users over all subcarriers is maximized by power allocation and tone permutation. In resource allocation for a multiuser two-way OFDMA relay network is investigated to support two-way communication between the base station and each of multiple users. In several relay selection policies for a MABC DF two-way relay network are proposed. The subcarrier based relay selection usually assumes that signals received over one subcarrier is amplified (or decoded) and forwarded by a relay over the same subcarrier in the next hop. However this is not optimal in terms of system performance. An improved performance can be attained if subcarriers in the first and second hops are paired according to the conditions of their channel. Such a subcarrier pairing approach was proposed in [1]. AF-based two-hop multi-relay OFDM system An AF-based two-hop multi-relay OFDM system in which we optimally and mutually assign the three types of resources: subcarriers, relay nodes, and power. Such joint optimization hasn’t been well thought of or considered in the literature as far as we know. We formulate it as a joint relay power allocation problem, subcarrier pairing, and selection with an objective of exploiting the transmission rate under specific power constraints. A dual nature can be used for solving the optimization problem in three phases. First, we find the optimal power allocation for any given strategy of subcarrier pairing and relay assignment. In the second phase, we determine the optimal relay assignment when subcarrier pairing is given. And in the last or third phase, we obtain the optimal subcarrier paring by means of the Hungarian method. The overall complexity of the optimal algorithm is polynomial in the number of subcarriers and relay nodes. Based on the intuition derived from the optimal algo rithm, we further propose two suboptimal algorithms that have lower complexity but can achieve close to optimal performances. PRACTICAL SUBOPTIMAL PAIRING ALGORITHMS In our model, the locations of the users, and their distances to each other are the major factors that affect their transmission rates. The impacts of Rayleigh fading and noise variances on the rates are negligible in comparison to path loss. This forces the power allocation and partner selection to be mostly dependent on the topology of the network, which means that a suboptimal but fast algorithm can be derived based only on user locations as an alternative to the maximum weighted matching algorithm. But then, the weights of the graph will not be needed to match the users, and this will decrease the time consumed by the matching algorithm drastically. We will be dealing with 5 algorithms as following:- Select Nearest to Receiver algorithm:- The two users nearest to the receiver get matched. These users are removed from the pool, and the algorithm repeatedly matches the rest of users with the same method until every user is matched. Select Farthest from Receiver algorithm:- The two users farthest from the receiver get matched. These users are removed from the pool, and the algorithm repeatedly matches the rest of users with the same method until every user is matched. Maximum Matching on Nearest Four to Receiver algorithm:- The user nearest to the receiver is selected. Then, three users which are nearest to it are selected. Maximum weighted matching algorithm runs on those users and the users get matched. The algorithm repeatedly matches the rest of users with the same method until every user is matched. Maximum Matching on Farthest Four from Receiver algorithm:- The user farthest from the receiver is selected. Then, three users which are nearest to it are selected. Maximum weighted matching algorithm runs on those users and the users get matched. The algorithm repeatedly matches the rest of users with the same method until every user is matched. Select Nearest and Farthest to Receiver algorithm:- The user farthest to the receiver gets matched with the nearest to the receiver. These users are removed from the pool, and the algorithm repeatedly matches the rest of users with the same method until every user is matched. The performance comparisons of the above algorithms are presented in this section. CHAPTER 2:  LITERATURE SURVEY In 2010, N. Balasubramanian, A. Carroll and G. Heiser et al, proposed that:- A rich body of literature has been dedicated to measuring the power consumption of cellular and WiFi interfaces for mobile users. Although a variety of power consumption models have been proposed and studied, one general conclusion is that, in spite of comparable power consumption (typically around 1 W), WiFi is much more power efficient in sending/receiving the same amount of data because of the higher data rates (e.g., a few Mbps for 3G while ten or more Mbps for 802.11n) [6]–[7]. Assuming that the wireless link is experiencing path loss as well as Rayleigh fading during the process is totally unacceptable. Note that, the data rate of the wireless link varies for different distances as well as channel realizations. In 2005, L. Shao and S. Roy, T. Thanabalasingham, S. Hanly, L. Andrew et al, proposed:- Resource allocation and interference management of multi-cell downlink OFDMA systems were presented. A key focus of these works is on interference management among multiple cells. Our general formulation includes the case where resource coordination leads to no interference among different cells/sectors/sites. In our model, this is achieved by dynamically partitioning the sub channels across the different cells/sectors/sites. In addition to being easier to implement, the interference free operation assumed in our model allows us to optimize over a large class of achievable rate regions for this problem. If the interference strength is of the order of the signal strength, as would be typical in the broadband wireless setting, then this partitioning approach could also be the better option in information theoretic sense [9][7]. In 2004, A. Nosratinia, G. Tsoulos et al proposed that:- A. Nosratinia, G. Tsoulos et al proposed MIMO systems because in recent years, MIMO systems [10] have been widely accepted as the ultimate approach to fulfilling the high performance demands of current and future generation of wireless systems. Using multiple antennas at the transmitter or/and receiver dramatically increases the spectral eà ¯Ã‚ ¬Ã†â€™ciency and enables the system to achieve very high data rates. It is also widely accepted that the majority of multi-antenna spatial diversity techniques are mainly applicable in downlink transmissions due to the size and complexity constraints that limit their implementation in small mobile units [11]. However, to achieve spatial diversity on the uplink without the need to have more than one antenna per mobile unit, cooperative transmission is the answer. In this case, the mobile units help each other to emulate a multiple transmit antenna system. In 2006, Yang and Belfiore proposed that:- Yang and Belfiore present a near optimal AF scheme which in certain conditions is able to achieve the diversity multiplexing trade-off (DMT) upper bound introduced. In [13], cooperative diversity protocols which are based on DF relaying are developed. The relay nodes that can fully decode the received transmission relay to the destination using a space time code. The idea of cooperative diversity under asynchronous channel conditions was suggested. The authors in [12] proposed a simple DF relay technique in a Code Division Multiple Access (CDMA) system where the relay nodes detect and forward the transmission regardless of whether successful decoding has occurred or not. In [13] a 2 hop asynchronous cooperative diversity technique is introduced where the authors propose two different protocols to determine the participating nodes. In this technique, the set of participating relays that receive the packet without errors is the only set of nodes involved in the relaying process. In 2004, Sendonaris et al proposed that:- The second type of uplink cooperation, which will be the main focus of this chapter, is based on pairing each user with a neighboring user, a â€Å"partner†, to create a MIMO-like effect on the uplink transmission. This was first suggested by Sendonaris et al. [14] in a synchronous full-duplex CDMA system utilizing orthogonal spreading codes. The technique was for a two user system where at the first transmission instance both users transmit their symbol to the other user and the base station. The symbol is then received and processed by the other user and in the following transmission instance the users transmit a composite signal consisting of their own symbol and a detected estimate of their partner’s symbol, each spread with its user’s spreading code, to the base station. In 2003, A. J. Jahromi, et. Al proposed that:- In this case at each transmitting instance, each user transmits a composite signal of both his new symbol along with a detected estimate of his partner’s previous symbol. In this method, to maintain the total transmit power constant, the joint transmit-power is manipulated such that at the base station, the average received power and the received power per user remains constant. In [15], the authors propose a new multiuser uplink pairing CDMA technique in which each user transmits its own signal to the base station and follows that by relaying a processed estimate of his partner’s information. At the receiving end, an algorithm is utilized to achieve near optimum ML performance with reduced complexity. CHAPTER 3:  PROBLEM FORMULATION 3. Problem formulation Scheduling and resource allocation are essential components of wireless data systems. Here by scheduling we refer the problem of determining which user will be active in a given time-slot; resource allocation refers to the problem of allocating physical layer resources such as bandwidth and power among these active users. In modern wireless data systems, frequent channel quality feedback is available enabling both the scheduled users and the allocation of physical layer resources to be dynamically adapted based on the users channel conditions and quality of service (QoS) requirements. This has led to a great deal of interest both in practice and in the research community on various channel aware scheduling and resource allocation algorithms. Many of these algorithms can be viewed as gradient-based algorithms, which select the transmission rate vector that maximizes the projection onto the gradient of the systems total utility. REFERENCES [1] A. Nosratinia, T. E. Hunter, and A. Hedayat, â€Å"Cooperative communication in wireless networks,† IEEE Comm. Magazine, vol. 42, no. 10, pp. 74–80, Oct. 2004. [2] A. Bletsas, A. Khisti, D. P. Reed, and A. Lippman, â€Å"A simple cooperative diversity method based on network path selection,† IEEE Journal on Selected Areas in Comm., vol. 24, no. 3, pp. 659–672, March 2006. [3] S. BakÄ ±m and O. Kaya. â€Å"Cooperative Strategies and Achievable Rates for Two User OFDMA Channels.† IEEE Trans. Wireless Commun., 10(12): 4029–4034, Dec. 2011. [4] C. Y. Wong, R. S. Cheng, K. B. Letaief, and R. D. Murch, â€Å"Multiuser OFDM with adaptive subcarrier, bit, and power allocation,† IEEE J. Sel. Areas Commun., vol. 17, no. 10, pp. 1747-1758, Oct. 1999. [5] Z. Shen, J. G. Andrews, and B. L. Evans, â€Å"Adaptive resource allocation in multiuser OFDM systems with proportional rate constraints,† IEEE Trans. Wireless Commun., vol. 4, no. 6, pp. 2726-2737, Nov. 2005. [6] A. Carroll and G. Heiser, â€Å"An analysis of power consumption in a smartphone,† in Proc. USENIX, June 2010. [7] N. Balasubramanian, A. Balasubramanian, and A. Venkataramani, â€Å"Energy consumption in mobile phones: a measurement study and implications for network applications,† in Proc. IMC, Nov. 2010. [8] L. Shao and S. Roy, Downlink multicell MIMO-OFDM: an architecture for next generation wireless networks, IEEE WCNC, vol. 2, pp. 1120 { 1125 Vol. 2, Feb 2005. [9] T. Thanabalasingham, S. Hanly, L. Andrew, and J. Papandriopoulos, Joint allocation of subcarriers and transmit powers in a multiuser OFDM cellular network, IEEE ICC, vol. 1, pp. 269 { 274, Jun 2006. [10] G. Tsoulos, 2006. MIMO System Technology for Wireless Communications. Boca Raton: Taylor Francis Group [11] A. Nosratinia, T. E. Hunter and A. Hedayat, Cooperative communication in wireless networks , IEEE Commun. Magazine, vol. 42, no. 10, pp. 74—80, Oct. 2004 [12] K. Vardhe and D. Reynolds, The Performance of Multi-User Cooperative Diversity in an Asynchronous CDMA Uplink, IEEE Trans. Wireless Commun., vol. 7, no. 5, pp. 1930—1940, May 2008. [13] S. Wei, D. L. Goeckel and M. C. Valenti, Asynchronous Cooperative Diversity, IEEE Trans. Wireless Commun., vol. 5, no. 6, pp. 1930—1940, Jun. 2006. [14] A. Sendonaris, E. Erkip, and B. Aazhang, User cooperation diversity — Part I: System description, IEEE Trans. Commun., vol. 51, pp. 1927 — 1938, Nov. 2003. [15] A. J. Jahromi, et. al., On multi-user detection in CDMA based cooperative networks, IEEE Sarnoff Symposium, 2009, SARNOFF ’09, 30 Mar. 1 Apr. 2009

Observing Toddlers Essay

Introduction   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   There are a number of places where toddlers could be observed unobtrusively—at the park, the playground, the mall, and the daycare center. For the purpose of this study, however, I chose to go to the park and observe parents and their toddlers play together. This way, I could easily observe unobtrusively as people would think I was simply there to write or to write down my thoughts.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Another benefit that the park has to offer is the lack of formal structures and relationships such as those found at daycare centers. At the park, parents and toddlers could interact easily and in a relax manner. That way, the true nature of the relationship between the parents and the toddlers will be easily observed and analyzed and the understanding of the interactions between parents and children will be better understood. This paper then seeks to look at such a relationship by presenting direct observations from families and toddlers that visit the park in our community. I had a small notebook with me and it is where I wrote down my observations, as well as the communication that went on between the parents and the children.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚     The toddlers that I observed were approximately between 16 to 30 months old and appeared to be pampered by care by their parents. One the toddlers belong to an Asian-American racial stock while the other one to an American family. Although the parents brought strollers with them, the toddlers were walking and occasionally carried by their parents. Both of the families of the toddlers seem to belong to the middle class. Notably, the second toddler belongs to a mother without a father. Although the author could not exactly know whether she is a single parent or not, at least based on the observation at the park, the mother does not have any other company in visiting the park.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Both toddlers appear to be enamored with their surroundings. They do notice the colors in the park and usually exclaim in delight when they see a butterfly or a bird. Apparently, they are already starting to recognize some of the features of the environment and their understanding of what they are is already being formed in the minds of the young kids. Toddler 1 The first toddler I observed is male. He displayed curiosity in his surroundings. While they were walking in the park, to the way where the family will sit down for an afternoon snack, the toddler was picking up sticks and leaves on the ground. He raised them to his eyes and offered them to his parents. The mother accepted the offer from the toddler and said that it was a leaf. She explained further that the leaf grows on the branch, which the toddler dutifully picked up and offered to her mother again. When the mother pronounced â€Å"leaf† and â€Å"branch†, the toddler also spoke up and attempted to pronounce the same words. A child is very much curious and interested in his surroundings. As part of his cognitive development, he notices the shapes, colors, and different sensations and wonders he encounter in his world. Even at such a young age, he is also being initiated into the process of socialization where he learns the views of his parents and of the larger society where he is located (Turner, 1991). The child, according to Piaget’s theory actively uses his senses to explore his environment and learn about them. Through the use of his senses, he is able to discern relationships among the actions he take and the behavior of the objects that he is viewing (Turner, 1991). Both the component of nature and nurture are at work in this seemingly simple process that the child is going through. He uses his eyes, his ears, his nose, and his whole body to discover the world and learn how it works. His efforts, because they are yet insufficient, are supplemented by his parents, more particularly by his mother, who tells him the names of objects and how they are being referred to in the world. Through the explanation of the mother about the nature of the relationship between leaves and branches, the child is then able to look at the relationship of different objects in his environment albeit in an incomplete fashion. The explanation of the mother regarding the relationship of leaves and branches may not be sufficient for the child to understand the relationship because most of the knowledge of a child advances through his actions and his interpretation about the consequences of the actions he make (Franz & White, 1985). Notably, the toddler was now engaging in eye-to-eye contact with his parents and occasionally asks them for what he wants. His father brought out a ball that the toddler apparently loved playing with. The father and the child started playing with the ball—they played catch, and sometimes they would race together to get the ball first. The toddler was delighted with such play with his father. Although this is the case, the child would also look at his mother and he asked her to come and join them. This is consistent with the theory of Erikson, which holds that the child’s relationship with his mother is perhaps the most important one during this stage of development (Franz & White, 1985). The child continued to play with the ball and when he saw other children in the park, he also went to them and offered to play the ball with them. Apparently, toddler one has good socialization skills to the point that he can mingle with other kids even when his parents are around. This points to the good relationship that the child is enjoying with his parents. Both his parents encouraged him to play with other children and watched him with other kids. True enough, when the child has strong relationships with his parents, he tends to be more socially responsive and socially amiable. In accordance with Psychosocial theorists, the child is displaying good emotional and social skills because his own relationship with his parents are also good and secure. Otherwise, he might become a recluse and refuse the company of people (Charlesworth, 2003). When Toddler one was playing ball with another child, there was an instance in which the other child managed to grab the ball more quickly than toddler one, so what he did was to forcibly claim the ball from his playmate and withheld it from the latter. Through this, the other child looked as if he was about to cry. It is at this moment that the mother of Toddler one intervened. The mother reasoned out firmly with the toddler in regards to sharing toys so that others would also learn how to share. The tone of the mother appeared to be negotiating instead of imposing. This display of authority on the part of the mother is remarkable and shows the secure connection between her and the child (Charlesworth, 2003). Toddler Two When I felt that I have sufficiently observed toddler one, I decided to turn my attention to another toddler playing with a dog not very far from the first toddler. The only companion of the toddler in the park is his mother and their Labrador. I had the impression, although this is difficult to verify, that the mother was a single parent. The mother was silently looking after her child who was playing with the Labrador. Apart from the toy truck and the Frisbee that the child had, there were no other toys that the mother had for the child. The mother appeared to be preoccupied with her own thoughts. When toddler was not busy with his toy truck, he would play with the Frisbee and the dogs with the strength and the capability that he has. The dog seems to act as a guard to the toddler. He does not socialize with other kids very much and he appears content to play by himself. The toddler, it seems is spending most of the time by himself. Although at first glance, this may seem to be a display of autonomy, yet in closer examination of the child, he does not enjoy the benefits that interaction with other kids and with his parent brings. These circumstances will therefore bring forth negative consequences in the development of the social skills of the child and he might find it difficult to relate with other people when he grows up (Keenan, 2002). When the child attempts to play farther from his mother, the latter would come after him and tell him not to move around too much. The mother actually uses her authority over the child to forbid him from going somewhere else. Apparently, the mother wants to keep the child in her sight most of the time. This kind of attitude might breed negative feelings in the child and will contribute to the insecurity of their relationship. Since the relationship of the child with his mother is of utmost importance (Charlesworth, 2003), then his cognitive, emotional and social development will suffer as a consequence. The child also develops a kind of mistrust in the outside world and he will not view the outside world as a safe place. Instead, he might develop the attitude that he always needs his mother to look after him. Erikson warned against this over-protectiveness of parents as it prohibits children to explore and become curious of their environment. Hence, instead of developing self-confidence and self-esteem, toddler two will instead feel shame and doubt (Franz & White, 1985). Toddler two cried when his mother forbade him to wander into the park. When the child cried, the mother responded by being firmer and she almost shouted to toddler two to stop. Instead of stopping, however, toddler cried even louder and displayed tantrums. At this time, the mother punished toddler two by spanking him three times. After several minutes, toddler two stopped crying and remained where he was instead. This display of authority may become inimical to the overall development of the child over the long run as the initiative and the natural curiosity of the child will be dampened and what he will remember most will be the fear associated with the parent’s discipline (Charlesworth, 2003). Toddler two recovered from the spanking after several minutes by turning his attention to the dog and his Frisbee. By distracting himself, he forgot about the incident and started to enjoy himself again. His mother, however, still issued a warning for him â€Å"not to move out of her sight.† According to Erikson, if the urge of the child to explore is removed, then the result would be a lower level of self-esteem on the part of the child (Franz & White, 1985). Toddler two is very much attached to her mother, however, he is not sufficiently developing autonomy. Through the reprimands and the stern warnings of his mother, he becomes dependent on his mother and unable to explore his environment and his surroundings. Over the course of time as he discovers the world further, he may not have sufficient curiosity and initiative to move away from the familiar and instead, he would keep in sight of whoever is looking after him. Conclusion   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Observing the two toddlers was a good experience for me. It was as if the concepts and theories discussed by Piaget and Erikson were coming to life. Indeed the role of the parents is very crucial in ensuring that a child receives the appropriate socialization and training even while he is young. The strength of the attachment of a child with his parents is very important for him to develop the necessary skills for socialization and in relating with others in his environment. If the relationship of a child with his parents is good as demonstrated by the first toddler I observed, then the child will greatly benefit from it. If, however, the nature of the relationship borders on the dysfunctional, then the socialization skills of the child will be negatively affected. As he grows up, he will have struggles in relating with different kinds of people in his environment.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   By observing toddlers, numerous lessons can be gleaned and the nature of the relationship between child and parents will be assessed. Accordingly, intervention strategies could be arrived at so that the child will not suffer needlessly. Furthermore, parents, and everyone dealing with children, should be sensitive to the different levels of development of the child as demonstrated by Piaget and Erikson. By doing so, perhaps the manner of bringing up of children will be better and over the long run, the society will become a better one because of the good rearing of the children. Reference Charlesworth, R. (2003). Understanding Child Development: For Adults Who Work With Young Children. New York: Thomson Delmar Learning. Franz, C. E. & White, K. M. (1985). Individuation and attachment in personality development: Extending Erikson’s theory. Journal of Personality, 53 (2), 224-256. Keenan, T. (2002). An Introduction to Child Development. London: Sage Publications. Turner, P. J. (1991). Relations between Attachment, Gender, and Behavior with Peers in Preschool. Child Development, 62 (6), 1475-1488.

The Scarlet Letter By Nathaniel Hawthorne - 1083 Words

The Scarlet Letter Essay The inner workings of human nature are evident through the centuries of conflict between people: differences in opinion with an implausible mortality rate. The Civil War, one of the greatest dissensions in the United States’ history, was ultimately based on the Confederacy’s desire to have institutionalized superiority over African Americans, demonstrated by the humiliation and degradation of slaves. The Union’s challenge to this colossal racial injustice was taken by the South as an assault to their pride and entitlement to power, sparking a war that vastly altered the history of the United States. This concept dates much further back than the Civil War, demonstrated by Nathaniel Hawthorne’s profound novel, The Scarlet Letter. Hester Prynne’s infamous affair brought about the punishment that essentially led to a redistribution of power in the Puritan town. Though Hester was the only known perpetrator, the punishment given to her by the close-m inded townspeople was not the only instance. Dimmesdale’s weakness was primarily brought on by both himself and his unusual residence with Roger Chillingworth. Punishment ultimately induces the demise of one of the rivals involved. Confined by harsh judgement and strict norms, Hester’s indefinite donning of the Scarlet Letter was a source of empowerment for the townspeople. Throughout the intricate plot of the novel, Hester’s scandalous past was always lurking in the background. Very much aware of theShow MoreRelatedThe Scarlet Letter By Nathaniel Hawthorne1242 Words   |  5 PagesLYS PAUL Modern Literature Ms. Gordon The Scarlet Letter The scarlet letter is book written by Nathaniel Hawthorne who is known as one the most studied writers because of his use of allegory and symbolism. He was born on July 4, 1804 in the family of Nathaniel, his father, and Elizabeth Clark Hathorne his mother. 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The time frame of the puritans resulted in Hawthorne eventually thinkingRead MoreThe Scarlet Letter By Nathaniel Hawthorne999 Words   |  4 Pages Nathaniel Hawthorne is the author of the prodigious book entitled The Scarlet Letter. In The Scarlet Letter, Hester Prynne commits adultery with Reverend Arthur Dimmesdale. Her husband, Roger Chillingworth, soon finds out about the incident after it becomes clear that she is pregnant. The whole town finds out and Hester is tried and punished. Meanwhile, Roger Chillingworth goes out then on a mission to get revenge by becoming a doctor and misprescribing Dimmesdale. He does this to torture DimmesdaleRead MoreThe Scarlet Letter, by Nathaniel Hawthorne1037 Words   |  5 Pagesthat human nature knows right from wrong, but is naturally evil and that no man is entirely â€Å"good†. Nathaniel Hawthorne, author of the classic novel The Scarlet Letter, believes that every man is innately good and Hawthorne shows that everyone has a natural good side by Hester’s complex character, Chillingworth’s actions and Dimmesdale’s selfless personality. At the beginning of the Scarlet Letter Hester Prynne is labeled as the â€Å"bad guy†. The townspeople demand the other adulterer’s name, butRead MoreThe Scarlet Letter By Nathaniel Hawthorne1517 Words   |  7 PagesNathaniel Hawthorne composes Pearl as a powerful character even though she is not the main one. Her actions not only represent what she is as a person, but what other characters are and what their actions are. Hawthorne makes Pearl the character that helps readers understand what the other characters are. She fits perfectly into every scene she is mentioned in because of the way her identity and personality is. Pearl grows throughout the book, which in the end, help the readers better understandRead MoreThe Scarlet Letter, By Nathaniel Hawthorne1488 Words   |  6 Pages In Nathaniel Hawthorne’s novel The Scarlet Letter, the main character, Hester Prynne, is a true contemporary of the modern era, being cast into 17th century Puritan Boston, Massachusetts. The Scarlet Letter is a revolutionary novel by Nathaniel Hawthorne examining the ugliness, complexity, and strength of the human spirit and character that shares new ideas about independence and the struggles women faced in 17th century America. Throughout the novel, Hester’s refusal to remove the scarlet letterRead MoreThe Scarlet Letter By Nathaniel Hawthorne1319 Words   |  6 PagesPrynne and Arthur Dimmesdale are subject to this very notion in Nathaniel Hawthorne s The Scarlet Letter. Hester simply accepted that what she had done was wrong, whereas Dimmesdale, being a man of high regard, did not want to accept the reality of what he did. Similar to Hester and Dimmesdale, Roger Chillingworth allows his emotions to influence his life; however, his influence came as the result of hi s anger. Throughout the book, Hawthorne documents how Dimmesdale and Hester s different ways of dealingRead MoreThe Scarlet Letter By Nathaniel Hawthorne1714 Words   |  7 PagesSome two hundred years following the course of events in the infamous and rigid Puritan Massachusetts Colony in the 1600s, Nathaniel Hawthorne, descendant of a Puritan magistrate, in the 19th century, published The Scarlet Letter. Wherein such work, Hawthorne offered a social critique against 17th Massachusetts through the use of complex and dynamic characters and literary Romanticism to shed light on said society’s inherent contradiction to natural order and natural law. In his conclusive statements

The Death Of The Car - 984 Words

Whoop! Whoop! Was the sound that transformed one evening for a group of classmates, causing them to fear for their lives and freedom. Four friends attended an afternoon conference, and decided to stop to get their hair cut on the way back to campus. Shortly, after leaving the barbershop, the driver noticed everything around the car illuminated in pulsing lights of red and blue. They were being pulled over. As one officer approached the driver-side, two others approached the passenger-side of their car. One officer demanded the driver’s identification, while the other two demanded everyone else put their hands out of the windows. Behind them the two patrol cars had turned into five, which turned into eight. Officers now had the car surrounded, as one officer demanded that the driver step-out of the vehicle, some of the other officers pulled the passengers from the car at gunpoint, placed them in handcuffs, and immediately began searching them. The driver tried to explain to the officers that they were students, when he was questioned what they were doing in the area, but it fell onto deaf ears. Once all of their records came back clean, the scene calmed, and as the students were being released from their handcuffs the officer explained, â€Å"We have had a lot of robberies around here lately, and one of the passengers fit his description. Simple misunderstanding. You all have a good day.† In the United States, to be black is to be a problem because to be black means that you areShow MoreRelatedThe Death Of A Car1206 Words   |  5 Pagessentence for a person convicted of involuntary vehicular manslaughter in result of death. Intentional or not, many ordinary people land themselves in prison for one foolish mistake. One glance at a text, one drink too many, or one decision to not put on a seatbelt can turn a person s life upside down. Many times, especially in a college atmosphere, teens make poor and naive decisions when faced with driving a car. One mistake can lead to life-altering consequences for the rest of a teen’s life.Read MoreThe Death Of A Car935 Words   |  4 PagesMariah West saw before her car struck a bridge and spiraled into oncoming traffic. She was ejected from the car, and then slid down the roadway causing her face to get disfigured and her skull to get crushed. Unfortunately, Mariah died on May 21st, 2009. When you step into a car you don’t expect anything life-threatening to happen. Safety is taken for granted as soon as one steps into an automobile. Most people in the world don’t have a single doubt about hopping in a car to get from Point A to PointRead MoreThe Death Of The Car811 Words   |  4 Pageswas a warm summer’s night when I pulled up in my blue Corvette convertible to pick up my boyfriend, Colton. To my surprise, he was already standing outside, dressed to kill, as usual, but there was a string of cars lined up along the curb. Colton motioned for me to pull in front of the cars; seemingly, trying to prevent me from seeing what was going on. I’ve heard a lot of talk about Colton being a pimp and drug dealer, but he has a regular 9 to 5 so I am convinced these rumors are nothing but jealousRead MoreThe Death Of The Car849 Words   |  4 PagesWe were in the car singing as loud as we could with the music. the phone rang and my mom picked up you could hear the worry in her voice. Me and my sisters didn’t know what was going on but we knew it was bad. the car was silent. my sisters and i wanted to know what was going on. the silence was broken up by a horn that was followed by phone signal to my mom. once she was off the phone the car was silent again. my mom explained what happened. I heard that my dad was in the hospital. I tunedRead MoreThe Death Of A Car Accident993 Words   |  4 PagesYou were on your way home when you died. It was a car accident. Nothing particularly remarkable, but fatal nonetheless. You left behind a wife and two children. It was a painless death. The EMT s tried their best to save you, but to no avail. Your body was so utterly shattered you were better of, trust me. And that s when you met me. What... what happened? you asked. Where am I? You died, I said, matter-of-factly. No point in mincing words. There was a... a truck and it was skiddingRead MoreThe Death Of The Cattle Cars1610 Words   |  7 Pageswould actually be doing this and at first still had hope. After being forced on the train they lost some of that hope they had, and because they didn t think of what would happen and had no idea what to expect as a result. â€Å"Life in the cattle cars was the death of my adolescence. How quickly I aged. As a child I loved the unexpected: a visitor from afar, an unforeseen event a marriage, a storm, even a disaster. Anything was preferable to routine. Now it was just the opposite. Anything preferable toRead MoreEssay on Death of a Salesman and Street Car Named Desire4007 Words   |  17 PagesBiff: â€Å"will you take that phony dream and burn it before something happens† Compare how the authors of Death of a salesman and â€Å"street car named desire explore the conflict between truth and illusion Truth and illusion are utilized in Tennessee Williams â€Å"Streetcar Named Desire† and Arthur Millers â€Å"Death of a salesman† through the use of the character; to lead the reader to a possible conclusion on the beliefs that went into the American dream that prompted people to work hard was that americaRead MoreDo you know that one of the leading causes of the death of many teenagers is car accidents?500 Words   |  2 PagesDo you know that one of the leading causes of the death of many teenagers is car accidents? National Teen Driving Statistics showed that 16-year-old teenagers are three times more likely to die in car accidents than the average of all drivers. More teenage drivers are involved in car crashes every year than any age group and are more likely to die. Many states grant 16 year olds unsupervised driving privileges, which many safety advocates argue it too soon. Many argue that teenagers are emotionallyRead MoreHow F1 Cars Have Drastically Limited Fo r Safety Since 1994 Essay1748 Words   |  7 Pagesperhaps the most intense, skillful, challenging motor sport in the world. This racing consists of car companies ranging from Toyota to Ferrari all competing for one title of fastest in the world. F1 cars are the fastest cars in the world as of today around all tracks reaching corning speeds of 180-mph. However, there can be and have been faster f1 cars in the past. All Performance aspects of f1 cars have been drastically limited for safety since 1994. I would propose that these laws and regulationsRead More Cars as a Symbol in The Great Gatsby Essay1036 Words   |  5 PagesCars as a Symbol in The Great Gatsby Cars play a very important part in the telling of The Great Gatsby. The Great Gatsby is a very dark, unhappy book, and the cars really exemplify this. à ¢Ã¢â€š ¬Ã‚ ¦cars change their meaning and become a symbol of death (Dexheimer). Cars also give the reader insight into some of the different characters in the book. One of the most important jobs of cars in this book is to foreshadow upcoming events. Throughout the book, there are many devastating and dark