1,720,966 research outputs found
Development and Applications of Multi-Degree-of-Freedom Angular Error Measurement System
No full text線性運動平台在運動過程中因各種因素而有六個自由度誤差，其中角度誤差會因阿貝原理而放大，對精度影響尤其顯著。如欲改善機台精度，首要之務即是量取其角度誤差資訊。
一般市售之高精度角度感測器價格昂貴，無法裝設於機台做長期監控使用。本文主旨為利用市售之DVD讀寫頭及四象限感測器，配合自行製作之訊號處理電路，及適當的光學方法，製作小體積、低成本且高精度之感測器。
在DVD讀寫頭應用方面，開發出DVD自動視準儀以及一維、二維光電水平儀。另外，並利用兩個四象限感測器，配合光路系統及雷射光源，製作可量測二維直線度及滾動度誤差之感測器。最後，並將DVD自動視準儀及滾動度感測器整合為一套可同時量測二維直線度及三個偏角度之五自由度誤差量測系統。Since variant reasons, linear moving stage has six degree-of-freedom errors during moving process. Especially the angular error influences the positioning precision significantly due to the Abbé principle. Therefore to improve the precision of the stage, the most important job is to measure its angular error information.
In general, commercial high precision angular sensors are expensive so that cannot be installed on machine to do long-term monitoring. The purpose of this article is to develop small volume, low cost, and high-precision sensors based on commercialized DVD pick-up head, quadrant detector and self-made signal process circuits.
In the application of DVD pick-up head, DVD autocollimator, 1-D and 2-D optoelectronic level are developed. Moreover, by employing two quadrant detector, optical system and laser source, a sensor which can measure 2-D straightness and roll angular error is fabricated. Finally, the DVD autocollimator and the roll sensor are integrated into one 5-DOFs measurement system, which can measure 2-D straightness , pitch, yaw and roll angular error simultaneously
臺北市高中 (職) 學生休閒學習情況輿休閒教育需求之研究
No full text[[abstract]]本研究主要目的在膫解台北市高中 (職) 學生的休閑學習情況與休閑教育需求，並探
討此二者的相關性、預測變項、及其在各變項間的差異性，藉以提出推展出台北市高
中 (職) 學生休閑教育的具體建議，以供有關單位參考。
為達成上述目的，首先，透過文獻探討，研析休閑教育的概念、模式與相關研究，據
以建立本研究之架構；其次，採用問卷調查法，以自編之「台北市高中 (職) 學生休
閑學習與休閑教育需求調查問卷」，對七十九學年度就讀於台北市各公、私立高中 (
職) 的學生進行抽樣調查，共得1255個有效樣本。調查資料分別以平均數、t 考驗、
單因子變異數分析、多元逐步迴歸分析、皮爾遜積差相關等方法進行統計分析，獲得
下列之結論：
一、台北市高中 (職) 學生的休閑教育以「休閑技能」層面的指導最為迫切。
二、台北市高中 (職) 學生期望休閑教育提供切合其生活所需休閑知能的學習。
三、台北市高中 (職) 休閑教育應特別關注低社經地位的學生。
四、父母親採「高關懷低權威」的休閑教養方式，對高中 (職) 學生的休閑學習最為
有利。
五、「同輩朋友的休閑知能表現」對高中 (職) 學生的休閑學習頗具影響力量。
六、母親休閑教養方式對子女休閑的影響力大於父親。
非營利組織推展成人教育之研究-以社會大學為例
No full text[[abstract]]隨著經濟與社會快速變遷，民眾學習需求日增，如何利用民間資源來推展成人教育
，是值得研究的課題。
目前，有關非營利組織推展成人教育的情況，在國內尚未有深入的研究。因此本研
究以「非營利組織推展成人教育之研究--以社會大學為例」為題進行研究，採取質
化研究取向，以實地觀察和訪問做為研究方法 獲得下列結論和建議:
1 、非營利組織成立的過程是艱辛的: 社會大學在一無所有的情況下，以其獨特而
順應時代潮流的成人教育理念，贏得許多社會人士的支持，因而奠定了基礎。
2 、非營利組織重視目標確認: 社會大學以其組織目標及當前的成人教育需求，做
為發展課程之依據 但必須避免過多的課程變動，造成資源的浪費。
3 、非營利組織策辦活動有其原則: 社會大學以對組織的期許及創辦人對教育的理
想，形成其設計成教活動時的原則。
4.非營利組織的經營應有其策略: 不強調利潤的非營利組織，必須在為群眾謀取最
大福利，與維持組織基本營運之，取得一個平衡點。
5 、非營利組織的發展應不斷檢討與修正: 成人會隨時代變遷而有不同的教育需求
，因此成教機構應該不斷修正與改進，以提供學習者最佳的學習方式。
二、建議
[1] 對社會大學的建議
1 、落實教育資源的共享: 以便能充份運用社會資源。
2 、擴大經費籌措的來源: 以提升成教活動的品質。
3 、修正領導的策略: 以凝聚組織共識及增加團結力量
4 、調整人力的管理: 應充份運用專業人才及志工。
5 、開辦網路教學:多吸取相關資訊以免事倍功半。
[2] 對非營利組織的建議
1 、把握成立契機: 需各方面有利條件約充份配合。
2 、恪守組織宗旨: 是組織賴以生存和發展的依據。
3 、整合相關資源:以促使資源的有效運用。
4 、注意學術研究:以有效配合成人教育的發展趨勢。
[3] 對政府主管單位的建議
1 、訂定獎勵辦法: 以便能激勵文教基金會。
2 、協助人才培訓: 以解決民間組織專業人才的不足。
3 、辦理績效評鑑:以做為非營利機構改進的準則。
[4] 對後續研究的建議
1 、對社會大學各分部做區域性研究: 以了解成人教育的區域性差異。
2 、與國內其他文教基金會做比較研究: 以了解不同的非營利機構推展成人教育之
異同。
3 、與國外推行成人教育約基金會做對照研究: 對照國外的文教基金會以截長補短
。
4 、進行全國非營利組織推展成人教育之量化研究: 以便形成可以普遍推論的通則
。
總之，從社會大學推展成人教育的情況中，顯示非營利組織在推展成人教育方面，
已有相當堅實的基礎，只要能儘量突破各方面的限制與障礙，以及加強非營利組織
間的連繫，必定可以為成人教育開拓更多的管道，改善國內成人教育的整體環境。
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
- …
