521 research outputs found
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
Secure Document Access Architecture based on Distributed Firewall and Proxy Technologies
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Multi-Layered Security Framework for Document Access Control
No full text由於網路技術的快速發展，企業組織所建立的內部網路其所及範圍與複雜度都日趨增加。同時隨著病毒與木馬後門等惡意程式的攻擊型態產生， 以往被視為安全可信賴的內部網路環境，其安全性問題受到極大的威脅。新型的木馬後門程式利用網路穿隧技術，透過標準的網路服務通訊埠，輕易地穿透企業防火牆進行內外的溝通與監視。而另一方面，透過內部網路進行文件的分享與存取，已成為各企業組織運作不可缺少的部分，文件安全性的問題尤其關係整個企業組織的發展，如何才能確保其安全，避免遭受可能的網路攻擊，便成為主要的研究課題。在本論文中，我們以企業組織的內部網路為範圍，研究提出S.P.A.C多層次的安全性架構，來提供安全的文件存取控制。在此架構下，我們同時可以與其他安全性機制(如IPsec, SSL)相結合，以發揮最大弁遄C另外在設計考量方面也以具彈性、低成本為目標，來減少企業組織實際應用的困難。相關研究的安全性機制包括各種個人防火牆技術與設計：以代理伺服器作為應用層面的控制、以動態封包過濾之個人防火牆作為網路底層的安全、以分散式防火牆來對使用端同時進行保護與控制、以動態密碼認證來作為整合的存取控制。With the highly advanced network technology, the Intranet of the organization has become more complicated and widely applicable. At the same time, new attack models of the malicious software, such as virus and Trojan horse, have also been developed. The Intranet environment, which used to be considered as safe and reliable in the past, suffers tremendous threats. Those novel viruses and Trojan attacks make use of the tunneling technique to bypass the firewall via standard service ports, such as port 80. On the other hand, the sharing of documents in Intranet is essential for present organization, and its security problem has been a threat to development of the organization. The ways to secure the document access and protect Intranet from attacks have become an important issue. In this dissertation, we focus on the security problem for document access control in Intranet, and propose the S.P.A.C. multi-layered security framework to secure it. Within the framework, some present security mechanisms such as IPSec, and SSL can also be integrated to provide more security. We also consider the flexibility and cost in the design to reduce the potential difficulties of physical deployment in the organization. A compete security framework comprises the proxy server technique for application level access control, the dynamic packet filter personal firewall technique for stopping the illegal network packets, the distributed firewall technique for controlling and protecting the client machines, and the dynamic id/password authentication for integration of document access control.Contents
1 Introduction 1
1.1 Background 1
1.1.1 Motivation 1
1.1.2 Security Categories 4
1.2 Security Target 6
1.2.1 Security Environment 6
1.2.2 Assumptions 10
1.2.3 Threats 10
1.2.4 Objectives 11
1.3 Organization of the Dissertation 12
2 Related Work 14
2.1 Network Security 14
2.1.1 Internet Layer 14
2.1.2 Transport Layer 15
2.1.3 Application Layer 15
2.2 Threat Models 16
2.3 Network Attacks 17
2.3.1 Port Scanning 18
2.3.2 Packet Sniffing 19
2.3.3 Man-in-the-Middle Attacks 19
2.3.4 Denial of Service Attacks 20
2.3.5 Trojan/Backdoor 21
2.3.6 Other Attacks 21
2.4 Firewalls 22
2.4.1 Firewall 22
2.4.2 Proxy 24
3 Designing the Framework 25
3.1 S.P.A.C. Framework 25
3.1.1 #S (Web Server) 28
3.1.2 #C (Client) 30
3.1.3 #P (Proxy Server) 33
3.1.4 #A (Authentication Server) 36
3.2 Integrated Access Control 37
4 Security Mechanisms 43
4.1 Dynamic Password Authentication 43
4.1.1 User Authentication 43
4.1.2 Protocol Design 45
4.1.3 Analysis 47
4.1.4 Deployment and Implementation 48
4.2 Dynamic Packet Filter Personal Firewall 49
4.2.1 Against the Attacks 49
4.2.2 XML-based Firewall Ruleset 49
4.2.3 Implementation 51
4.3 Distributed Firewall 52
4.3.1 Login Authentication 53
4.3.2 Protocol Design 56
4.4 Personal Firewall Enhancement 58
4.4.1 Protection from ARP Spoofing 58
4.4.2 Network-Saver 60
5 Evaluation 63
5.1 Design Analysis 63
5.1.1 Port Scanning 64
5.1.2 Packet Sniffing 65
5.1.3 Man-in-the-Middle Attacks 66
5.1.4 Denial of Service Attacks 67
5.1.5 Trojan/Backdoor 67
5.2 Functional Test 68
5.2.1 Distributed Firewall 70
5.2.2 Dynamic Packet Filter Firewall 71
5.2.3 Anti-ARP Spoofing 71
5.3 Penetration Test 72
5.3.1 Port & Vulnerability Scanning 72
5.3.2 Denial of Services 73
6 Conclusions and Future Work 76
6.1 Conclusions 76
6.2 Future Work 77
7 Bibliography 7
Fabrication of Integrated Nebulizer Nozzle Plate Utlizing Micro-molding for FD- ESI Mass Spectrometry
No full textThis study presents a novel concept to integrated nebulizer nozzle plate for FD-ESI (Fused-droplet Electrospary Ionization Mass Spectrometry) using modified LIGA process. This fabrication technique can reduce the production cost of current nozzle plate. It comprises of multi-exposure and single develop (MESD) process, the extra-hard Ni-Co (Nickel-Cobalt) electroforming and thin-wall plastic microinjection molding. The template of nozzle plate is patterned using dry film and MESD process. Later, the template is transferred into metal Ni-Co mold by electroplating. In this study, the technique of extra-hard Ni-Co alloy electroplating process with Hardness of Vickers over (HV) 550 is developed. Then with the stiffness of Ni-Co mold, it can withstand high injection speed. Thin-wall microinjection molding process with short cycle time to fabricate nozzle plate can be finished. Liquid crystal polymer (LCP) is used for thin-wall microinjection molding process. In order to make efficiently atomization, we used ANSYS to optimize PZT actuator. Besides, the work of nebulizer with FD-ESI was demonstrated in this study. a novel design of nozzle plate
[[alternative]]A Study on Taipei Municipal High School Students' Satisfaction of Campus Sports Facilities
No full text[[abstract]]A Study on Taipei Municipal High Schools Students’ Satisfaction of Campus Sports Facilities
Abstract
The major purpose of this study was to understand the levels of junior high students’ satisfaction of campus sports facilities. Questionnaire were used in this study 1,428 junior high school students from second-grade and third-grade in Taipei City were selected as the subjects in this study. The research tool in this study is “Questionnaire on the Junior High Student’ Satisfaction of Campus Sports Facilities”. The data was analyzed by descriptive statistics, chi square statistics, one-way ANOVA, Scheffe' posterior comparison, Pearson production-moment correlation. The main findings were as follows:
Ⅰ.The usage of sports facilities
1.Students generally have lower cognition toward the rules and notice of sports facilities.
2.Over half of the students only used the sports facilities when they were in Physical Education extracurricular activities.
3. 52.9% students used the sports facilities less than one time in a week.
4.The time student spent on using sports facilities is within one hour.
5.Most students chose the classmates in the same class or extracurricular activities as their companion, then the neighbors or friends were their second choice.
6.Outdoor sports field and basketball courts are the major types that students used.
7.After using the sports facilities, 79% students were willing to exercise again.
Ⅱ. The students’ level of satisfaction of campus sports facilities
1. Toward the overall facilities
1) The level of overall satisfaction of campus sports facilities was average.
2) The level of overall satisfaction of campus sports facilities was significant due to different grades, gender, school districts, members of users, the time and frequency of use.
2.Toward each sports facility
1) The level of satisfaction of the indoor and outdoor sports facilities was between average and unsatisfied.
2) The top five factors that students feel unsatisfied with sports facilities were the poor equipments, opening hours, amount of equipments, poor air-condition and dirty equipments.
3) The level of satisfaction of each sports facility was significant due to different grades, gender, school districts, members of users, companion and the time, length, frequency of use.
4) Students’ level of satisfaction of sports facilities was correlated to their willingness to use again.
Ⅲ.The factors that affected students’ level of satisfaction of campus sports facilities
The factors that contribute to levels of students satisfaction with regard to the sports facilities included: gender, grades, school districts, members of users, the time of use, length of use , frequency of use , companion and the willingness to use again .
Key words: Taipei City, junior high school students, sports facilities, satisfaction.
A Study of Yu-chien Jo-fen
Get PDFYü-chien 玉澗, who is as famous as Mu-chi has always been praised till our time as a painter of the “transcendental mode” of the end of the Sung Period and there are fine examples of his works, such as the fragments of the “Scroll of the Eight Views of Hsiao-hsiang” and the fragments of the “View of Lu-shan.” But we have four painters crowned with the name of Yü-chien through the Sung and Yüan Periods, and it is problematical which is the artist of the works we have. Among these four, Mêng Yü-chien i 孟玉澗, who was not a monk and who lived in the latter half of the Yüan Period, can not be and naturally has not been regarded as the artist of these works. As for Pin Yü-chien 彬玉澗, another of the four, we find a poem for his painting in an anthology of a Ch'an monk. But we have not enough material to connect this with the existing “ Yü-chien” works.
The other two are Ying Yü-chien 瑩玉澗 and Yü-chien Jo-fên 玉澗若芬. The author earlier presented a hypothetical idea that the “ Yü-chien” we have is Ying Yü-chien, a poet priest in the circle of the famous Ch'an priest Ch'ih-chüeh Tao-ch'ung 癡絶道冲. The reasons were that he was considered to have been one of the pastime painters of the Ch'an Sect, who have been thought to have encouraged ink painting at the end of the Sung Period and that all of the existing works haye Yü-chien's own poems.
However, after that, the author found several materials which convinced him that the Yü-chien we have is not Ying Yü-chien but chien Jo-fên, and here presents his new theory. It is as follows. In the anthologies of such literati as Wu Shih-tao 呉師道, Chin Lũ-hsiang 金履祥 and Wang Po 王柏, who are from Chin-hua 金華 as well as Yü-chien Jo-fên, and who were active at the end of Sung and the beginning of Yüan, he found the name of Fên Yü-chien; and there he also found the facts that he was good at simple transcendental ink painting and that he always wrote his own poem on his painting. Not only that, he made it clear that the biography of Yü-chien Jo-fên in Sung-chai-mén-pú 松斎梅譜, written by Wu Tai-su 呉太素, is a rather precise record of Jo-fên and Jo-fên's paintings as he saw and heard of them. From these facts, WEM, the author judges it more reasonable to consider this priest of the Tien-t'ai Sect from Chin-hua of Chê-ching Province as the artist of the extant works than to connect Ying Yü-chien, the poet priest, and these works. This new idea rises a new question for the student of Sung and Yüan ink painting, who generally have tended to em phasize the relationship between the Sung and Yüan ink paintings and the church of the Ch'an sect : on the one hand, it proposes a question about artists' personal taste which may, more than the religious attitude of the Chan sect, have promoted this artistic trend, and also a question about the possible relationship of this trend to the tradition of ink painting in Chê-chiang Pro vince and to the prevalance of the transcendental style in the Sung Period.journal articl
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