18,096 research outputs found
Research Data: High-Dimensional Codebook Design for the SCMA Down Link
No full textThis is the dataset of the accepted paper (1 Aug 2018): L. Li, P. Z. Fan and L. Hanzo, "Research Data: High-Dimensional Codebook Design for the SCMA Down Link"</span
Distributed Markov-based Primary User Protection Framework for Cognitive Radio
No full text近年來，由於無線技術的進步，在日常生活中有越來越多的無線設備和基地台架設，像是無線都會網路、無線區域網路、以及無線個人網路。這些無線網路系統必須佔用部分頻段，隨著越來越多無線標準的提出、運作，可用的無線頻譜也就越來越珍貴。
然而研究顯示出頻帶的使用情形極度不平衡。針對這樣的問題，在1999年提出了感知無線電，感知無線電是一種有智慧的通訊系統，
它可以察覺周遭環境變化，並從中學習，進而調整內部參數設定，做出最佳決定。
這篇論文基於感知無線電的理論，提出一種在無線網路(802.11)架構下，保證優先使用者資料傳輸的機制，這個機制保證優先使用者和感知無線電使用者共存的情形下，感知無線電使用者的資料傳輸將會被限制以達到保證優先使用者的傳送資料不會受到感知無線電使用者的影響。我們使用馬可夫模型分析了在優先使用者傳輸未達到飽和狀態
以及感知無線電使用者傳輸已達飽和狀態下，優先使用者的資料傳送量與感知無線電使用者的傳送參數的關連性，藉由這個關連性，我們可以找出最佳的傳輸參數設定以保障優先使用者的資料傳輸。
我們透過網路模擬器的實驗來驗證我們提出的模型，此外，我們也利用模樣測試來證明我們提出的演算法表現良好。In recent years, with wireless technologies advanced, there are more and more wireless devices and base stations deployment. These wireless systems must occupy some frequency bands. As a result, with more and more wireless standards released and implemented frequency spectrum is getting treasurable. Although frequency spectrum exhibits scarcity, research shows that spectrum is inefficiently and unbalanced utilized. The idea of cognitive radio was proposed in 1999 by Joseph Mitola to efficiently utilized the unused frequency spectrum and increase overall utilization. It is defined as an intelligent wireless system that is aware of it surrounding environment and learns from it to adapt its internal parameters in realtime.
Based on the concept of cognitive radio, we propose "Markov-based Primary User Protection" in 802.11 environment. This scheme addresses the coexistence of primary users and cognitive radio users and guarantees the transmission of primary users will not be affected by cognitive radio users. At the same time, cognitive radio users can maximize their traffic to efficiently utilized the available channel resources. We first analyze the non-saturation Markov model of primary user as well as saturation Markov model of cognitive radio user. Combining two models together, we find out the relationship between current load of primary users and the optimal transmission parameter setting that can guarantee the usage of primary users.
We validate our model by comparing the calculation yielded by the model and the results of simulation. In addition, we also verify our proposed algorithm behaves well through simulations.Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
中文摘要. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
Table of Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Cognitive Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Research Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 Our Contribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Related Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Ongoing Research on CR . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Channel Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Distributed Markov-based Primary User Protection Framework . . . . . . 9
3.1 Channel Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Decision Making . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.1 Spectrum Information Collection . . . . . . . . . . . . . . . . 11
3.2.2 Markov-based Analytical Model . . . . . . . . . . . . . . . . . 13
3.2.3 Dynamic Adaption . . . . . . . . . . . . . . . . . . . . . . . . 26
4 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.1 Model Validation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.2 Performance Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.2.1 Performance Metrics . . . . . . . . . . . . . . . . . . . . . . . 32
4.2.2 Simulation Settings . . . . . . . . . . . . . . . . . . . . . . . . 32
4.2.3 Simulation Results . . . . . . . . . . . . . . . . . . . . . . . . 33
5 Conclusion and Future Work . . . . . . . . . . . . . . . . . . . . . . . . . 39
Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
The politics of fashion: perceptions of power in female clothing and ornamentation as reflected in the sixteenth-century Chinese novel Jin Ping Mei
Get PDFThis thesis examines issues of female power and influence in sixteenth-century China focusing on how women and their roles were perceived in the changing social environment of the mid-late Ming dynasty. Using aspects of a New Historicist approach, information from contemporary literary and historical sources are analysed alongside each other. With its emphasis on the lives of women and preoccupation with the description of material objects, the late Ming novel Jin Ping Mei forms an important element in the thesis. China in the sixteenth century saw expanding urbanisation, the emergence of a new wealthy merchant class, increasing visibility of women and a questioning of traditional morality. Fashion consciousness, as one of the most conspicuous aspects of the new material culture, is a possible indicator of these trends. Traditional Western theories contend that fashion began in the particular context of Renaissance Europe. However, this study argues that a similar fashion awareness existed in China too, and was manifested in a competitive striving for social status, in this case specifically among women. In contrast to previous studies which downplayed the impact women had on defining traditional Chinese culture, this thesis demonstrates how women and their sartorial choices began to redefine the boundaries of material culture, influencing literati discourse which, in turn, re- influenced female behaviour
The political role of the people's liberation army 1949-1973
Get PDFThis thesis is to study the political role of the People's Liberation Army from the approach of structure and function. The framework of the thesis consists of three major parts, first, the influence of Chinese traditional political culture on, and the formation of, the political role of the PL A; second, the influence of domestic political struggles and external military conflicts on the development of the political role of the PLA; and the third, the analysis of the transition of the PLA's political role from the structure and personnel arrangements of the CCPCC Within the above-mentioned three scopes, this thesis make a thorough discussion on the following: (1) The relationship between the structure of the PRC and the formation of the PLA's political role; (2) How has ideology influenced the army's political role; (3) What is Mao's viewpoint and his influence on the development of the army's political role; (4) What is the link between the army and the party, and how has this developed; (6) What accounts for the expansion of the PLA's political functions; (7) What is the influence of political factional struggles on the PLA's political role; (8) Is it political institution or military institution that controls the recruitment of the military elite; (9) What are the disparities between the military elite in handling international conflicts and what are their political considerations; (10) What is the Party's position in the army; (11) How have the Party’s important meetings and personnel arrangements influenced the rise and fall of the PLA's political role
Prolixus Beard, Fan & Walter 2005
No full textGenus Prolixus Beard, Fan & Walter, 2005 Prolixus Beard, Fan & Walter, 2005: 164; Mesa et al., 2009: 111; Beard & Ochoa, 2011: 32; Xu & Zhang, 2014: 2; Xu et al., 2017b: 1522. Type species: Prolixus forsteri Beard, Fan & Walter, 2005.Published as part of Xu, Yun, Zhang, Fei-Ping & Zhang, Zhi-Qiang, 2018, Description of a new species of Prolixus (Acari: Trombidiformes: Tenuipalpidae from Austroderia splendens (Poaceae) in New Zealand, with discussion of its ontogenetic patterns in chaetotaxy, pp. 158-177 in Zootaxa 4540 (1) on page 159, DOI: 10.11646/zootaxa.4540.1.11, http://zenodo.org/record/261609
Taiwan’s democratic progressive party and its mainland china policy
Get PDFTaiwan has successfully changed its political system from dictatorship into a democracy since the end of 1980s. Some people do not like 'Taiwan's democracy' -some candidates get elected by bribery in election, parliamentary fighting., but the majority of the Taiwanese people really enjoy their freedom in their homeland. They do know, at least, they have the right to oppose the government, no one would be shot by the national military force in a demonstration. The political systems are totally different between Taiwan and Mainland China, one is democracy, another is communism. Even the majority of the Taiwanese people are Chinese in ethnic origin, but their life experience are different over the past 50 years, it is difficult for any side to persuade the other side which one is better. Some Chinese Taiwanese people believe that they can have a better life, if their homeland—Taiwan can be really independent in the international community. Taiwan’s political opposition built Taiwan's first opposition party— Democratic Progressive Party (DPP) 13 years ago, and with the dream of establishing a new independent country on Taiwan. The establishment of the DPP is the result of the political opposition movement in Taiwan. Most of the members of the DPP have a strong Taiwanese identity, which is very different from the ruling KMT in Taiwan and the ruling CCP in China. The DPP gains more influence in Taiwan, the uncertainty across the Taiwan Straits increase at the same time. The DPP waited and saw between being the ruling party and establishing an independent country on Taiwan, finally it chose to complete the political aim of replacing the position of the KMT at present. The purpose of the study is to assess the DPP's policy-making in its Mainland China policy. I try to give a full picture of the policy-making process in the party. The most important factor in the formulation of the mainland China policy is the relationship between the factions within the DPP, therefore, I adopt the historical and document review approach on doing this study, and describe how the interaction between the factions worked and how they made the decisions on the policies? I found that the DPP will insist on its 'one Taiwan, one China' policy before becoming the ruling party in Taiwan. However, the DPP's insistence on the 'one China, one Taiwan' policy could bring conflicts across the Taiwan Straits and obstruct the possibility of replacing the ruling KMT's position. Hence the DPP tried to explain again the party's Taiwan independence platform, and to 'purify' the party’s ideology in order to achieve its present political aim. Because the cross-Straits relationship is still developing, the DPP's mainland policy would be affected by various factors across the Taiwan Straits. There is no final text of the DPP's mainland China policy at present. Therefore, I predict the future development of its China policy could tend in two ways. Firstly, if the cross-Straits exchanges increase, and Beijing reduces its hostility, the DPP's stand of 'one Taiwan, one China' will become more flexible, and it would keep on developing a more perfect China policy. Secondly, if the cross-Straits exchanges decrease, and Beijing increases the force of threatening to Taipei, the DPP's stand of 'one Taiwan, one China' policy will be more radical, even though it would not turn its back on the business affairs. At the end of this work, I suggest the DPP rethink its insistence on a Taiwanese independence position, this could not break Taiwan's isolation in international community, but could endanger Taiwan's security. As the factional fight has reduced the force of the DPP, to condense the powers of the party would be an important issue for the DPP
Application of the Symmetric Model to the Design Optimization of Fan Outlet Grills (SCI; 2017 JCR Science Edition; IF:2.143)Symmetry.
No full text[[abstract]]In this study, different designs of the opening pattern of computer fan grills were investigated. The objective of this study was to propose a simulation analysis and compare it to the experimental results for a set of optimized fan designs. The FLUENT computational fluid dynamics (CFD) simulation software was used to analyze the fan blade flow. The experimental results obtained by the simulation analysis of the optimized fan designs were analyzed and compared. The effect of different opening pattern designs on the resulting airflow rate was investigated. Six types of fans with different grills were analyzed. The airflow velocity distribution in the simulated flow channel indicated that the wind speed efficiency of the fan and its influence were comparable with the experimental model. The air was forced by the fan into the air duct. The flow path was separately measured by analog instruments. The three-dimensional flow field was determined by performing a wind speed comparison on nine planes containing the mainstream velocity vector. Moreover, the three-dimensional curved surface flow field at the outlet position and the highest fan rotation speed were investigated. The air velocity distribution at the inlet and the outlet of the fan indicated that among the air outlet opening designs, the honeycomb shaped air outlet displayed the optimal performance by investigating the fan characteristics and the estimated wind speed efficiency. These optimized designs were the most ideal configurations to compare these results. The air flow rate was evenly distributed at the fan inlet
The Poetry of Ping-Pong
No full textIn this chapter, the author looks at the poetry of Ping-Pong, his favorite sport. According to Marty Reisman, the game of Ping-Pong died in Bombay, India, in 1952. Reisman, nicknamed “The Needle,” was favored to win the World Table Tennis Championship that day. The author says he has always loved Ping-Pong because you can get into a rhythm, hit the ball back and forth across the net for hours, with any racquet, and simply talk. Ping-Pong, like poetry, is a players' sport, not ideal for spectators. Bob Mankoff, the cartoon editor of The New Yorker, claims that there is palpable humor in the game. With Ping-Pong, the author insists that we are all capable of attuning ourselves to the hidden life of sports, a relationship that is about kinesthesia and embodiment.</p
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