Eclipse 是目前最廣受歡迎的軟體工具整合平台，其可擴充的架構，允許第三方撰寫名為 Plug-in 的擴充套件將既有的或是新開發的工具程式整合至此平台。然而隨著 Eclipse 的普及以及可用工具套件的增加，衍生的困擾則是幾乎每一套 Eclipse 平台都會裝載過多的工具。雖然 Eclipse 的架構提供了諸如 Plug-in 的延遲載入（Lazy-Loading）、快速裝載與更新等功能，讓 Eclipse 平台具有相當高度的可延展性（Scalability），但整體效能還是會因為裝載過多的工具程式而下滑。 為了解決上述問題，本研究提出一套名為 Remote Plug-in 的解決方案，允許使用者或是廠商將原生（Native）或非原生的工具發布到遠端站台，並透過本研究提供的開發工具快速產生包裝程式，讓標的工具能以 Web Services 的型式發布到站台上供使用者叫用。另一方面，需要使用這些工具服務的 Eclipse 平台則可以透過本研究提供的輔助 Plug-in 提供之功能，直接叫用這些工具服務，效果則有如使用安裝於相同電腦的 Plug-in 一樣。 此作法除了能降低 Plug-in 的安裝數量，進而改善 Eclipse 平台的整體效能外，也能減少許多不常使用工具的裝卸。此外，Remote Plug-in 架構的其他優點在於讓用戶得以使用在其平台無法安裝執行的工具程式，軟體商亦可經由發布 Remote Plug-in 加強對軟體的記錄控管。 / Since its inception in 2001, Eclipse has quickly become the most popular platform for software development, partly thanks to its extensible architecture, which allows third parties to easily integrate their software tools into the platform in the form of plug-ins. As the quick increase and abundance of free or cheap Eclipse plug-ins available to the public, coming up also is the problem that most users install too many plug-ins than tolerable in a platform. Although the designers of Eclipse have develped mechanisms such as Lazy-Loading [42], and quick installation and update subsystem to make Eclipse scalable, the overall performance is inevitably degraded for the installation of too many plug-ins. In order to overcome this problem, we propose in this thesis a method called remote plug-ins which can enable the distribution and sharing of plug-ins in remote sites. Users or ISVs (independent software vendors) can deploy their tools on remote sites and use the tool we have developed to wrap them as web services accepting requests from Eclipse platforms. On the other hand, users needing services of remote plug-ins could install in their local Eclipse the proxy plug-in which we developed for requesting services of remote plug-ins. With the help of the proxy, remote plug-ins can be invoked as if they were local ones. By moving unnecessary plug-ins outside of local Eclipse installation, not only can our method improve the overall performance of the platform, but it can also diminish the waste of time on tedious installation and uninstallation of plug-ins which are seldom used. Other advantages of our method include the feasibility of invoking remote plug-ins which are either hard or unable to be installed in local Eclipse, as well as more complete control of vendors to client's access to their tools deployed as remote plug-ins.

Peer-to-Peer(P2P)架構讓社群內的使用者收集分散在網路各處之資源，其中最為風行的P2P系統當屬P2P檔案分享系統。P2P檔案分享系統之架構可分為集中式及分散式，而分散式架構又可細分為結構化及非結構化兩種。採用分散式且非結構化之BitTorrent-like架構，因其可擴張性較佳而廣為風行。在經驗中發現，BitTorrent-like架構在非對稱網路之下雖擁有寬裕的下行頻寬，但是其頻寬使用率卻不高，我們分析其成因如下：(1) Fractional Upward Bandwidth (FUB) 、 (2)Blockage of Acknowledgement (BoA) 與 (3)Long Physical Paths 等。而其中的Blockage of ACK問題，現今尚未有研究學者提出完整解決方案。本研究之目的，即要針對此Blockage of ACK的問題，改良網路協定中的傳輸層 (Transport Layer) 協定以提昇P2P檔案分享系統之效能。我們改用UDP作為傳輸層協定，並在應用層加入自動重建遺失之封包、決定基本傳輸單位大小及決定資料傳送速率等機制，以彌補UDP之缺陷。文中並提供了傳輸協定運作時所需參數的估計法，並且也與其它傳輸協定做效能之比較。實驗結果發現，我們設計的傳輸協定確可改善P2P檔案共享系統的運作效能。 / Peer-to-Peer (P2P) architectures let participants gather resources form network and make participants acquire more computation resources than they could offer. One of the most prominent P2P systems is P2P file sharing system. P2P file sharing system could be classified into to 2 categories: centralized and decentralized model. BitTorrent-like (BT-like) model can be classified as decentralized and unstructured model. BT-like model is quit popular nowadays due to its scalability. Unfortunately, BT-like model has several shortcomings on performance over asymmetric networks, because of some problems, such as Fractional Upward Bandwidth (FUB), Blockage of Acknowledgement (BoA) and long physical paths. No complete solution is available yet to solve the BoA problem. We propose a new UDP-based protocol to alleviate this problem. Since UDP protocol is not able to guarantee the data-integrity nor to determine the proper transmission rate by itself. To offer a complete solution, we have to enhance UDP, to add extra capabilities such as packet loss recovery, segment size determination and data rate determination mechanisms. Experiments show that our proposed protocol has good improvement on performance.