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Visitant: A Structured Agent-Based Peer-to-Peer System
No full text點對點系統連結成千上萬的使用者成為一個龐大的組織，並且協調網際網路規模般大量的資源來提供分享。由於空前的資源分享能力，使得點對點系統越來越普及。然而，現有的點對點系統只提供基本及簡單的服務，這並不能滿足使用者的需求。將行動代理人技術跟點對點系統整合的「以代理人為基礎的點對點系統」，其可用來設計跟發展分散式的客制化服務。使用者可以設計行動代理人，指派它到遠方的電腦來達成需要的任務。
目前的代理人為基礎的點對點系統即是採用上述觀點，把行動代理人視為是點對點系統中的應用程式。本研究認為，整合行動代理人與點對點系統應該可為互利。在本論文中，討論了如何利用結構化點對點系統的特點來解決在行動代理人系統中的問題，包括：代理人移動、代理人之間的溝通以及安全相關的議題。此外，我們實作了兩個應用系統情節，分別是影片擷取以及浮水印檢驗，來印證我們的系統的有效性。A Peer-to-Peer (P2P) system connects hundreds of thousands of users into a vast organization and coordinates huge, Internet-scale resources for sharing. With the unprecedented resource sharing power, P2P systems are becoming increasingly popular throughout the world. However, existing P2P systems only provide basic and simple services that cannot satisfy demand. An agent-based P2P system integrates the mobile agent technology into P2P systems for the design and development of distributed customized services. Users can develop mobile agents and dispatch agents to remote peers to extend functions.
Existing agent-based P2P systems adopt the above viewpoint and take mobile agents as applications of P2P systems. We believe that mobile agents and P2P systems could be mutually beneficial to each other. In this thesis, we design and implement a structured agent-based P2P system: Visitant. We discuss how to utilize characteristics of structured P2P system to solve challenging issues of mobile agent systems, including mobility, communication, and security issues. Furthermore, we implement two application scenarios: movie condensation and watermark examination to verify validity of our system.1 Introduction 1
1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Thesis Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Related Work 5
2.1 P2P Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1.1 Unstructured and structured P2P systems . . . . . . . . . . . . . . . 6
2.1.2 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Mobile Agent Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.1 Mobility Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2.2 Communication Issues . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.3 Security Issue: Clone Management . . . . . . . . . . . . . . . . . . . 15
2.2.4 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3 Agent-based P2P Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.3.1 Anthill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.3.2 A-peer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.3.3 Agent Development Kit (ADK) . . . . . . . . . . . . . . . . . . . . . 20
2.3.4 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.4 Summary of This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3 System Design 23
3.1 System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2 Structured P2P System Layer . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.3 Visitant System Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.3.1 Locating & Tracking Module . . . . . . . . . . . . . . . . . . . . . . . 25
3.3.2 Post O±ce Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.3.3 Immigration & Migration Module . . . . . . . . . . . . . . . . . . . . 29
3.3.4 Resources Discovery Module . . . . . . . . . . . . . . . . . . . . . . . 30
3.3.5 Security Control Module . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.3.6 GUI for Monitoring & Control . . . . . . . . . . . . . . . . . . . . . . 36
3.4 Visitant Agent Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.4.1 Mobile Agent Template . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.4.2 Mobile Agent Life-Cycle . . . . . . . . . . . . . . . . . . . . . . . . . 39
4 System Implementation 40
4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.2 Graphic User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.2.1 Resource Discovery Window . . . . . . . . . . . . . . . . . . . . . . . 41
4.2.2 Create Agent Window . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.3 Monitoring and Control Window . . . . . . . . . . . . . . . . . . . . 44
4.2.4 Messenger Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.3 Application Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
4.3.1 Scenario 1: Movie Condensation . . . . . . . . . . . . . . . . . . . . . 47
4.3.2 Scenario 2: Watermark Examination . . . . . . . . . . . . . . . . . . 49
5 Conclusions and Future Work 51
5.1 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.2 Future Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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