在無線傳輸網路環境日益普遍的今日，以往各類型只在固定網路傳輸上的應用都紛紛的套用在具移動性要求的無線傳輸網路上。然而無線網路的傳輸環境比固定網路有更多使用上的條件限制以及需克服技術上的問題，像是與基地台傳輸距離的限制而產生對傳輸連線上換手( Handover )的需求，以及因為換手而導致傳輸時各種時間上的延遲( Delay )和抖動( Jitter )，若是多媒體 (Multimedia) 的多點傳輸( Multicasting )需求，則更要對傳輸內容的特性和傳輸協定的可靠性、可擴展性及穩定性加以考量。再者因為在無線傳輸環境中接收端和發送端都可能是處於移動的狀態，所以整個傳輸架構的健全性 ( Robustness )也十分重要。基於這些需求，本論文提出利用跨層(Cross Layer)設計來匯集較低網層協定在傳輸速率(Throughput)上的優勢，以及由較高網層協定提供之針對傳輸內容不同需求的應用彈性，降低協定在既有網路中實現的困難度，以期Wireless網路提供多點傳輸時在滿足穩定性及可靠性的要求下，達到最佳的傳輸速率表現。 / Applications of wireless mobile network are prevalent in recent years. Many applications inherited or developed from wired network have been proposed to enable mobile nodes to connect to wireless mobile network to access resources/services from Internet using multicasting protocol. However, wireless mobile networks have difficulty in forwarding information due to its inherent dynamism and frequent topology changes. To multicast multimedia data stream, we have to consider not only the issues of reliability, robustness, scalability and stability of routing protocol, but also the content of transmission. Besides, when handover occurs frequently during transmission, the throughput decreases rapidly due to severe jitter and delay. This thesis presents a hybrid multicasting policy for wireless mobile network to build a multicasting architecture using cross layer design of network layer and application layer to manage quality transmission according to flexible requirements. In summary, our goal is to optimize throughput in order to fulfill the requirement of reliability and stability of multicasting in wireless mobile network.

網路使用率逐漸普及、傳輸技術的進步以及通訊網路蓬勃發展，提供人們許多生活上的便利，無線網路已經成為現代通訊市場上的新寵兒。其中，IEEE於1999年開始制定與修正WiMAX，此協定在無線網路的應用視為解決”最後一哩”接取問題的利器。然而，無線網路仍舊會遇到傳送訊號耗弱、通訊死角或是氣候干擾等種種原因造成傳輸失敗的問題。 MPEG-4編碼上，考慮影音封包具有不同重要性的意義，針對影音封包需制定不同的重傳機制，本研究先行改善WiMAX中ARQ（Auto Repeat Request）的流程，再利用跨層設計使得MAC層可以辨識影音封包資訊，確保GOP-tree中之＂骨幹＂節點穩定的抵達率，再利用Lagrange’s Method of Multiplier方法，針對GOP-tree中非骨幹部分提出合適的trade-off客製化。最後本研究藉由網路模擬器NS-2(Network Simulater ver. 2)與myEvalvid-NT的實驗架構，做不同效能的評比，並以PSNR值評估所提出之方法的有效性。 / The growing of network popularity, progressing of trasmission technology and development of communication network have facilitated our daily life these years. Wireless network has become a new favor at modern communication market. Among of them, IEEE has started to design and modify specification of WiMAX since 1999, which has been thought to be the solution toward “last mile”. But, there still exist problems such as Doppler effect, blind corner of communication and obstruction of weather condition, which cause the failure of communication. MPEG-4 coding would concern the different significances of distinct types of packets, we should define retransmission strategies for different multimedia packets, respectively. Firstly, we improve the process of ARQ(Auto Repeat reQuest). Secondly, we use MAC-centric design to distinguish multimedia packets and guarantee the arrival rate of packets in the “backbone nodes” of a group of pictures tree. Thirdly, Lagrange’s Method of Multiplier is used to customize the trade-off of “non-backbone node”. In the end, we have performance evaluations by NS-2(Network Simulator ver. 2) and myEvalvid-NT, to verify the efficiency of the proposed method using Peak Signal to Noise Ratio.

本研究試圖將雙邊關係導入區域整合的解釋範疇，主要探討東南亞國家之間雙邊互動關係的解釋因素，以及東協對應成員國間衝突本質的制度建構，從而推進區域合作的進程。 從理論文獻與經驗事件，本研究運用「雙邊層次理論」（dyadic level theories）解釋東南亞國家間的互動現象，選擇「相對權力」、「軍事實力」、「政體類型」、「貿易互賴」、「經濟發展」作為開發中國家雙邊關係的解釋變數，用以理解東協成員國走向衝突與合作的選擇，並對「衝突－合作」的理論命題進行檢驗，據以提出適用於東協國家雙邊互動變異的解釋模式。本研究主張，開發中區域內雙邊關係受到國家屬性與相對特質的影響，爰須從個別國家互動交往的變遷軌跡予以觀察，其解釋變數將持續影響未來的整合道路。 在理論檢證的操作上，本研究參照「事件資料分析」（event-data analysis）方法，設計「雙邊互動的衝突—整合量表」（the Conflict-Integration Continuum, CIC），蒐集自1990年至2012年的「時間序列與橫斷面資料」（TSCS），並建置「東協成員國雙邊互動關係時間序列資料庫」（ASEAN-TSCS Data set）。透過資料庫分析和預測模型之建構，本研究釐清東協雙邊關係變異的解釋因素，並確認對於開發中國家間互動關係的影響關係。 為周延地理解東南亞次區域體系中單元層次（國家間互動）與整體層次（東協整合）的互動連結，本研究對東協歷年構建的安全制度與爭端解決機制進行文本分析，擇取區域內各組雙邊關係進行案例研究。透過對東協國家相對特質與互動事件的比較，進一步檢證次體系內國家間互動行為的關聯特徵，本研究期能為東南亞的整合研究提供一種理論啟示。 / This study aims to interpret regional integration through the lens of bilateral relations. It primarily addresses the factors in bilateral interactions between the Southeast Asian nations and delves into the process in which the ASEAN put forth an architecture to resolve the inherent conflicts between its member states to further promote regional cooperation. Based on theoretical literatures and historical events, this study uses dyadic-level theories to explain interactions among the Southeast Asian countries, chooses “Relative Power,” “Military Capability,” “Regime Types,” “Trade Interdependence,” and “Economic Development” as explanatory variables for bilateral relations between developing countries in this region for the purpose of understanding the choices made by the ASEAN member states towards either conflict or cooperation, and inspects the theoretical proposition of “conflict-cooperation” so as to put forth an explanatory model applicable for changes in the bilateral interactions between the ASEAN countries. The author argues that the bilateral relations in a developing region are not only influenced by the objective characteristics of each country, but also the relative relation to other countries. Therefore, observing the interactions between each individual country to others is required. The independent valuables are also dynamically influencing the approach of integration in the future. In terms of theoretical validation, a conflict-integration continuum (CIC) is designed for this paper with reference to event-data analysis approach, time-series cross-sectional (TSCS) data between 1990 and 2012 is collected, and an ASEAN-TSCS data set is established. By means of database analysis and construction of a prediction model, this research clarifies the explanatory factors for changes in bilateral relations between ASEAN countries and determines the effects that they have on interactions among developing countries. For the purpose of comprehensively understanding interactive linkages between the unit level (interactions amongst nations) and the overall level (ASEAN integration) in the Southeast Asia sub-regional system, this paper performs a text analysis on security regimes and dispute settlement mechanisms constructed by the ASEAN over the years and selects bilateral relations of pairs in the region as case studies. In addition to the data-driven analysis above, comprehensive knowledge of the interactive linkages between individual country and the overall ASEAN are also required. Therefore, a text analysis on security regimes and dispute settlement mechanisms constructed by the ASEAN is also conducted in this thesis. Several pairs of countries are used as case studies to investigate the bilateral relations in this region. By comparing relative qualities and interactional events of ASEAN countries, correlative features of interactions among the countries in the subsystem are further validated, as such, this paper aims to provide a theoretical revelation for research on the integration of Southeast Asia.

近十年來，由於無線網路的普及與人們對於影像串流服務的需求愈高，導致人們迫切需要更好的服務品質。但在IEEE 802.11無線網路中，本身的設計並非針對影像串流來設計，為讓影像串流能在無線網路更有效率，我們必須重新設計適合影像串流的無線網路。本研究首先探討IEEE 802.11 MAC層DCF (Distributed Coordination Function)與802.11e EDCA (Enhanced Distributed Channel Access)機制的潛在問題。由於DCF與EDCA並未特別對影像串流做設計，會導致具有時延(delay time)限制的影像封包等待過久造成失效，卻仍繼續傳送。本研究提出幾個有效方法，改善原本IEEE 802.11無線網路對影像串流傳輸效能不彰的現象。我們將利用跨層設計使MAC層能取得影像串流封包資訊，並改善DCF與EDCA的重傳(retransmission)機制，使用time limit與retry limit混和設計節省不必要的等待時間，並使用single-video multi-level queue改善傳輸效能。最後本研究將利用網路模擬器NS-2 (Network Simulater ver. 2)與影像串流測試實驗架構myEvalvid-NT作不同效能的驗證比較並評估我們所提出方法的有效性。 / Over the past decade, wireless network access and video streaming services have become more popular than ever. People are eager to have better quality of video streaming services over wireless network. However, IEEE 802.11 DCF and IEEE 802.11e EDCA are not specifically designed for video streaming. This leads to the problem of transmitting overdue video packets and thus degrades both the network performance and video quality. In this paper, we propose a hybrid design framework to improve the quality of video streaming. This framework consists of a MAC-centric cross-layer architecture to allow MAC-layer to retrieve video streaming packet information (slice type and transmission deadline), a retransmission mechanism of hybrid retransmission deadline and retry limit to save unnecessary packet waiting time, and a single-video multi-level queue to prioritize I/P/B slice delivery. Simulations show that the proposed methodology outperforms IEEE 802.11e, IEEE 802.11e Timebase and IEEE 802.11e MultiQ in packet loss rate, invalid packet ratio, lost and invalid packet ratio, delay time, jitter, and PSNR.

本研究主要目在於針對教師組織公民行為構念的界定作進一步的釐清並結合社會交換理論、人格理論、工作內在動機、印象管理動機、以及組織文化等觀點，提出以校長與教師交換關係、教師自我監控與工作投入為個人層次預測變項，個人/集體主義為團體層次預測變項之教師組織公民行為前置因素之跨層次模式，再透過階層線性模式方法分析以探討這些前置變項對教師組織公民行為之影響以及他們之間的關係。研究採用調查研究法，以台北市37所公立國民中學教師為對象，發出925 份問卷，最後回收736份有效問卷，有效問卷回收率則為79.57％。本研究主要研究發現為: (一)教師組織公民行為應視為一個聚合模式多層面構念；(二)教師工作投入為相對最重要教師組織公民行為前置因素；(三)人格特質對教師組織公民行為的影響主要是間接透過工作投入的中介效果；(四)不同類型組織公民行為的前置因素以及效果互有差異。 / The main purpose of current study was to revisit the construct validity issues of organisational citizenship behavior and to investigate the dynamics of teachers’ organizational citizenship behavior antecedents. Based on theories of social exchange, personality, job intrinsic motivation, impression management and organizational culture, a multi-level model of teahers’ organizational citizenship behavior antecedents was proposed where leader-member exchange, self-monitering and job involvement serve as individual level antecedents, individualistic/collectivism as school level antecedent and teachers’ organizational behavior as outcome variable at individual level. Valid data was collected from 34 public junior higher schools and 736 teachers in Taipei city. The main findings can be summarised as follows: (1) teacher organizational citizenship behavior should be treated as a aggregated model multidimensional construct; (2) Relatively teachers’ job involvement is the strongest antecedent for three dimensions of OCB; (3) the effect of teachers’ conscientiousness on OCB is mediated by teachers’ job involvement; (4) the antecedents included in current study have varied significant or insignificant effects on three dimensions of teachers’ OCB.