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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

從電子零組件產銷探討IC產業發展 / Explore IC industry development through the Production-Marketing of Electronic Parts and Components

葉自強 Unknown Date (has links)
隨著全球經濟逐漸復甦及國際原油價格逐漸下滑的條件下,全球各地區消費力也開始活絡,當消費市場再一次的被開啟的同時,3C產品將會再一次的席捲全球,而且將成為現代人必備的生活用品之一。尤其近年來,伴隨著雲端科技的進步及物聯網的普及,讓生活變的更便利。然而,在科技日新月異的時代環境變遷下,逐漸開啟的不只是民眾生活的便利而已,開啟的還有相關產業的永續發展,而IC產業便其中之一。 因此,為能深入的瞭解IC產業的發展,本研究考慮透過國內電子零組件的生產與銷售的現況與趨勢,據以判斷IC產業的未來發展的參考。另一方面,本研究同時也藉由電子零組件的生產量、生產值、銷售量、銷售值、存貨量、存貨值等資料,進行分析,其中電子零組件的產業類別區分積體電路、分離式元件、半導體封裝與測試等,並且茲將研究發現整理如下: 一、 積體電路之MOS DRAM與IC製造(不含MOS DRAM)的產銷量出現相互消長的現象; 二、 12吋及以上之晶圓代工是未來IC產業的主軸; 三、 積體電路的產銷值占電子零組件總產銷值之冠; 四、 電子零組件銷售值之長期預測為成長的趨勢。
2

以階層式動態編隊的方法計劃群體運動

周旭騏 Unknown Date (has links)
群體機器人運動的自動產生,可以應用在可移式機器人群的路徑規劃或電腦動畫中虛擬人群的模擬上。文獻上研究對此運動計劃問題,多以分離式或集中式的方法來解決。分離法是把群體的計劃,切割為多個個別機器人的連續計劃。本論文採優先順序的分離法依序解決個別機器人的計劃;而個別計畫的方法係採用位能場與A*搜尋法,我們並針對群體運動的特性提出改進方案。分離法的搜尋由於受到前面計劃結果的限制,因此缺乏計劃的完整性;相對而言,集中法同時考慮所有機器人的組態,因此可以完整地搜尋整個群體機器人的組態空間。我們首先採用的集中法是以位能場為基礎的隨機路徑計劃法。此法雖然具備完整性,但在機器人數量多時,機器人間的碰撞機會太高,所以計劃所需時間通常較長。因此,我們設計了一個採用階層式動態編隊方式的集中式計畫法。階層式動態編隊就是以球形樹組織機器人隊伍,依照搜尋時的狀況,動態地進行隊伍的分離或合併。同隊伍中的機器人會維持一致的運動方向,因此減少了機器人間發生碰撞的機會,因而改善了計劃的效率。我們實驗比較分離法、集中法、與動態編隊法,並分析各種情況下適合的計劃方法,以提出使用建議。我們並且設計了一個平滑化路徑的方法,將計劃出來的群體運動路徑調整平順,以應用在電腦動畫的製作過程中,自動產生擬真的虛擬人群運動。 / The automatic generation of crowd motions can be used in planning the path of many mobile robots and in simulating the motions of virtual humans in computer animation. In the literature, there exist two categories of approaches to this problem: decoupled and centralized approaches. The decoupled approach divides the planning problem into several sub-problems, each of which is for a robot. In this thesis we have used a prioritized planning approach with an artificial potential field and the A* search algorithm to solve each sub-problem in a given order. This decoupled approach usually is not complete because later planning must be under the constraint of previous planned results. On the other hand, the centralized approach considers the configurations of all robots and can be made complete by searching the composite configuration space. In this thesis, we use the randomized path planner (RPP) with a potential field as an example of the centralized approach. However, this planner is not very efficient for a large number of robots because of frequent inter-collisions between robots. Therefore we propose a hierarchical dynamic grouping method to improve the centralized RPP method. The robots are organized as groups enclosed by a sphere tree structure that can split or merge dynamically according to the environment. The robots in the same group always move with the same direction. Consequently the collisions between robots decrease significantly during the search and the planning efficiency is greatly improved. We have designed extensive experiments to compare the performance of the decoupled approach, the centralized approach and the dynamic grouping method. We also analyze these approaches in various scenarios in order to illustrate their tradeoffs. In addition, we have designed a path-smoothing method and apply the planning result to a production process of computer animation.

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