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研究生：	周智倫 Chou, Chih-Lun
論文名稱：	在行動環境之智慧型多媒體分享與推薦系統 Intelligent Multimedia Content Sharing and Recommendation System in Mobile Environments
指導教授：	鄭憲宗 Cheng, Sheng-Tzong
學位類別：	博士 Doctor
系所名稱：	電機資訊學院 - 資訊工程學系 Department of Computer Science and Information Engineering
論文出版年：	2012
畢業學年度：	100
語文別：	英文
論文頁數：	97
中文關鍵詞：	行動環境、多媒體分享、推薦
外文關鍵詞：	Mobile Environments, Recommendation System
相關次數：	點閱：123 下載：0
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本論文提出了一創新的方法來將行動環境下的使用者依照興趣群組分類，透過此方法可以延長興趣群組的存活時間與增加行動環境下使用者間的交流量。另外本論文發展了於興趣區間中的細胞自動機之興趣本體論機制來將行動環境下的使用者依照興趣群組分類，各個使用者的興趣依據著我們所設計的細胞自動機規則來加以分類群組。而根據提出的方法所做的實驗結果顯示，本方法能延長興趣群組的存活時間與增加行動環境下使用者間的交流量。
IEEE 802.16 WiMax是近年來備受矚目的無線網路傳輸機制，其中分為PMP(Point-to-multipoint)以及Mesh兩種模式。Mesh是FBWA(Fixed broadband wireless access)的系統，被視為下一代的無線都會網路的解決方案，採用的是TDMA排程方法，其中排程又分為集中式(centralized mode)以及分散式(distributed mode) ，集中式是由BS來掌控所有資源並且決定SS之間的傳輸排程。
本論文提出了一個在WiMax Mesh 內部的多播串流機制，透過二階段式的方法，建立有效率的multicast tree。第一階段先利用我們提出的Priority-Based Algorithm來建立 multicast sub-trees，第二階段再利用Interference-Aware Steiner Tree的方法，建立Source node到所有 multicast sub-trees的串流路徑。實驗結果顯示，我們提出的兩階段式建樹方法，不管是在 multicast sub-tree的建立上面，還是減少multicast tree對整體網路interference 影響上面，都能夠有很大的提升。

推薦系統在日常生活中處處可見，諸如電子商務、線上購物、數位學習等等。推薦系統不僅提供身處在資訊爆炸時代的我們在選擇事物參考指標，也提升了在大量資料裡搜尋相關資訊的能力。近年來，推薦系統的發展已引起各領域學者的興趣與關注，在各種不同領域的大量數位內容中取得對貼近所求，也是多數研究鑽研的目標。
本論文之目的在於提出一套適用於各種領域的個人化推薦機制，結合本體論的技術可使得應用領域更有彈性。
從使用者過去對某些項目的評分，系統可分析出使用者的喜好，而透過不同領域定義好的語意，系統可以推論出在這眾多資料中還有哪些是使用者也會有興趣的項目。因此在本研究中，除了找出相關項目的推薦機制是研究重點之外，對使用者的喜好分析也是探索的目標之一。從使用者過去對選擇項目的評分，推論出使用者對於某些分類的關注值與喜好值，進而產生出推薦名單以供使用者做決策參考。
本論文主要採用的方式是以使用者過去評分記錄為分析對象，分析得之使用者對該領域的各分類關切度，並以基於知識系統的推薦技術為基準，透過本體論定義的屬性序列尋找相關項目，並在尋得項目時以使用者關切度計算出對該項目的喜好度。而在個人化模組訓練方面則是採用基因演算法使得架構模式具有學習能力，在訓練的過程中試圖找出最符合該使用者的參數值，藉以達到個人化的最終結果。

This thesis proposes a novel approach to clustering the interests of mobile users, increasing the lifetime of interest groups, and increasing the throughput in mobile user-to-mobile user (M2M) environments for mobile IPTV (MOTV) societies. This thesis develops an interest ontology of cellular automata (CA) clustering using the zone of interest (ZOI) for mobicast communications in mobile ad hoc network (MANET) environments. The key to the proposed method is to integrate CA clustering with the ontology of users’ interests. This thesis proposes that both an interest profile (ontology) of users and information about mobile devices can help form a group of MANET-related interests. The current study evaluates the performance of the approach by conducting computer simulations. Simulation results reveal the strengths of the proposed CA-clustering algorithm in terms of increased group lifetime and increased ZOI throughput for MANETs.
IEEE 802.16 WiMAX is a rapidly developing technology for broadband wireless access systems. The IEEE 802.16 MAC layer defines two operational modes, point-to-multipoint (PMP) mode and mesh mode. In the centralized protocol, all resources are controlled by base station (BS). In this thesis, we propose a novel two-stage scheme for constructing an effective multicast tree. The first stage applies a significance-based algorithm to find suitable multicast points and construct effective multicast sub-trees. The second stage applies an interference-aware Steiner tree to connect the source to each multicast sub-tree. Finally, an algorithm generates the final multicast tree topology. Simulation results reveal that the proposed approach outperforms others in the construction of a multicast tree and significantly reduces the interference of a mesh network.
Recommender systems provide strategies that help users search or make decisions within the overwhelming information spaces nowadays. They have played an important role in various areas such as e-commerce and e-learning. In this thesis, we propose a hybrid recommendation strategy of content-based and knowledge-based methods that are flexible for any field to apply. By analyzing the past rating records of every user, the system learns the user’s preferences. After acquiring users’ preferences, the semantic search-and-discovery procedure takes place starting from a highly rated item. For every found item, the system evaluates the Interest Intensity indicating to what degree the user might like it. Recommender systems train a personalized estimating module using a genetic algorithm for each user, and the personalized estimating model helps improve the precision of the estimated scores. With the recommendation strategies and personalization strategies, users may have better recommendations that are closer to their preferences. In the latter part of this thesis, a real-world case, a movie-recommender system adopting proposed recommendation strategies, is implemented.

Table of Contents
摘  要	I
Abstract	III
List of Tables	ii
List of Figures	iii
List of Figures	iv
Chapter 1.	Introduction	1
Chapter 2.	Background and Related Work	8
2.1.	An MOTV Society in Mobile Ad-hoc Networks	8
2.2.	A Multicast Mechanism for Intra WiMAX Mesh Network	12
2.3.	The Adaptive Ontology-based Personalized Recommender System	14
Chapter 3.	Using Cellular Automata to Form an MOTV Society in Mobile Ad-hoc Networks	20
3.1.	System Model	20
3.2.	Performance Evaluation	33
Chapter 4.	A Multicast Mechanism Using Significance- Based and Interference-Aware Algorithm for Intra WiMAX Mesh Network	38
4.1.	Proposed Scheme	38
4.2.	Performance Analysis	48
4.3.	Simulation Results	51
Chapter 5.	The Adaptive Ontology-based Personalized Recommender System	54
5.1.	Adaptive Ontology-Based Personalized Recommender System	54
5.2.	Implementation of The Movie AOPRS	67
Chapter 6.	Conclusions	85
References			87
 
List of Tables
Table 1: Recommendation Techniques	17
Table 2: Simulation parameters and range of values	33
Table 3: The user ratings as a transaction table	58
Table 4: The 2x2 contingency table for X-->Y	58
Table 5: An example of a fragmented rating record	72
Table 6: An example of fragmented genre records	73
Table 7: Example of 2*2 contingency tables	73
Table 8: The GA controlling parameters in the Movie AOPRS	76
Table 9: The Enhancement of weighting vector training using GA	80
Table 10: Relationship between selected items and expected items	81


 
List of Figures
Figure 1: Channel zapping time	2
Figure 2: (a) Cellular like PMP mode; (b) Mesh mode.	4
Figure 3: Control tree rooted in BS.	5
Figure 4: Rules for the game of life	10
Figure 5: Cultural Portal Information in RDF	17
Figure 6: An interest-ontology service scenario	22
Figure 7: System structure diagram	22
Figure 8: The interest-item reordering.	24
Figure 9: Interest ontology for an MOTV society	25
Figure 10: IEEE802.11p channel distribution [44]	27
Figure 11: Multi-channel multi-group interest	28
Figure 12: Operations of mobicasting for ZOIs: (a) ZOI(t); (b) ZOI(t+1)	32
Figure 13: Network lifetime.	34
Figure 14: Average packet loss	35
Figure 15: Updated group-head cost rate	35
Figure 16: Dissemination success rate for communication range	36
Figure 17: The probability of collision relative to the number of mobile users	37
Figure 18: Build tree process	40
Figure 19: (a) B as multicast node; (b) node A and C as multicast node	41
Figure 20: Example of Significance-based algorithm	43
List of Figures
Figure 21: Interference-aware value	47
Figure 22: The decision of minimize multicast node model	50
Figure 23: Number of subtrees	52
Figure 24: Total interference of Steiner tree	52
Figure 25: Number of nodes in multicast tree.	53
Figure 26: The AOPRS Architecture	54
Figure 27: An example using SPARQL	61
Figure 28: The search-and-discovery process	62
Figure 29: Process of personalized weighting vector training using GA	66
Figure 30: The system architecture of the Movie AOPRS	68
Figure 31: The data-cleaning process	69
Figure 32: Part of the MMO classes and properties view	71
Figure 33: The mapping between MMO and user ratings.	72
Figure 34: An example of semantic search and discovery.	75
Figure 35: The fitness values average over all permutations	77
Figure 36: The RMSE predictive-accuracy metrics with and without GA training	80
Figure 37: Impact on recall from different cutoffs in randomly selected users	82
Figure 38: Impact on precision from different cutoffs in randomly selected users	82
Figure 39: The ROC curve of the Movie AOPRS.	84


                                    

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校內：2014-08-10公開
校外：不公開電子論文尚未授權公開，紙本請查館藏目錄

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