• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 284
  • 67
  • 28
  • 23
  • 20
  • 17
  • 13
  • 11
  • 10
  • 9
  • 8
  • 6
  • 6
  • 6
  • 4
  • Tagged with
  • 591
  • 93
  • 84
  • 83
  • 78
  • 63
  • 57
  • 52
  • 41
  • 40
  • 39
  • 37
  • 37
  • 35
  • 32
  • 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.
251

台灣地區大學排名指標建構之研究

湯家偉 Unknown Date (has links)
本研究旨在建構台灣地區大學排名指標,並藉以評估大學辦學品質。研究方法部分,先以文獻分析歸納出大學排名指標之九大構面與六十八項指標,再以專家問卷以及模糊德菲術問卷進行調查。模糊德菲術調查樣本為二十位高等教育學者與行政首長,本研究透過三角模糊數整合專家對指標重要性之看法並篩選指標項目,最後以歸一化之方式求得各構面以及各項指標權重,完成台灣大學排名指標體系。根據研究之結果與分析,歸納主要結論如下: 一、本研究建構之台灣地區大學排名指標,含九大構面共29項指標。 指標九大構面依權重高低依序為: 教師素質(12.7%)、學校課程與教學 品質(12.5%)、研究表現(11.7%)、大學聲望(11.6%)、學生素質(11.5%)、 學生與畢業校友表現(11.5%)、學校資源(10.0%)、國際化(9.7%)、校園弱勢關懷(8.8%)。 二、教師素質構面共包含三項指標:具博士學位之專任教師比例(4.4%)、專 任教師中教授所佔比例(4.2%)、專任教師比率(4.1%) 三、學校課程與教學品質構面共包含兩項指標:師生比(6.5%)、大學生對大學課程的評價(6.0%) 四、研究表現構面共包含八項指標:全體教師平均獲得研究獎助數(1.5%)、曾獲國家層級學術獎項之教師比率(1.5%)、具全國性專業學會院士成員身分之教師比例(1.5%)、全體教師在Nature、Science刊物,SCI、SSCI、TSSCI、EI以及A&HCI收錄期刊之論文發表平均數(1.4%)、全體教師在Nature、Science刊物,SCI、SSCI、TSSCI、EI以及A&HCI收錄期刊之論文平均被引用次數(1.5%)、全體教師刊載於國內有外審制度期刊與研討會之論文平均數(1.4%)、全體教師發表於國際研討會之論文平均數(1.5%)、全體教師教師專書出版之平均數(1.4%) 五、大學聲望構面共包含三項指標:國內學術同儕聲望調查(4.0%)、雇主對畢業生之滿意度評價(3.8%)、畢業生對母校評價(3.9%) 六、學生素質構面共包含兩項指標:新生甄選入學接受率(4.9%)、以考試分發入學新生之學科測驗平均成績(6.6%) 七、學生與畢業校友表現構面共包含三項指標:五年內學生贏得全國性學術獎項數(3.7%)、該年度畢業生就業(畢業六個月內覓得全職工作)及繼續唸研究所的比例(4.1%)、學以致用率(3.7%) 八、學校資源構面共包含兩項指標:每生之學校年度經費總額平均(4.8%)、每生平均年度學校圖書設備經費(5.2%) 九、國際化構面共包含三項指標:以華文以外領域為主修之國際學生比率(3.2%)、國際教師比率 (3.0%)、全校國際合作計畫件數(3.5%) 十、校園弱勢關懷構面共包含三項指標:招收弱勢學生(2.8%)、大學生平均在校工讀時數(2.7%)、學校年度經費作為清寒學生補助之比例(3.3%) 最後,本研究依研究結果分別提出以下建議: 一、對高等教育主管機關之建議 二、對進行、發布大學排名者之建議 三、對排名資料使用者之建議 四、對未來研究之建議 / The purpose of this study is to construct the Taiwan university ranking indicators which aim to evaluate the education quality of universities. As for research methods, by means of literature review, 68 indicators within 9 main dimensions had been organized as a raw model of Taiwan university ranking indicators based on which the Fuzzy Delphi questionnaire was developed and the survey was conducted with the sample size of 20 higher education experts. Symmetric triangular fuzzy number then was used to analyze experts’ opinion on the importance of each indicator and to help indicator selection. At last stage, normalization of fuzzy number’s total score determined the weight of each dimensions and indicators; accordingly, the Taiwan university ranking indicator system was constructed. The main conclusions are as follows: 1.The Taiwan university ranking indicator system consists with 9 dimensions and 29 indicators in total. The 9 dimensions are: faculty quality(12.7%), curriculum and teaching(12.5%), research(11.7%),reputation(11.6%), student selectivity(11.5%), performance of students and graduates (11.5%), financial resources(10.0%), internationalization(9.7%), inclusiveness(8.8%). 2.The dimension of faculty quality consists with: percent of full-time faculty with top terminal degree(4.4%), percent of full-time faculty as professor(4.2%), percent of full-time faculty(4.1%) 3.The dimension of curriculum and teaching consists with:staff:student ratio (6.5%), student evaluation of course(6.0%) 4.The dimension of research consists with:research grants per academic staff member(1.5%), percent of academic staff member with National Faculty Awards(1.5%), percent of academic staff member with Academy membership (1.5%), publications on Nature, Science, SCI, SSCI, TSSCI, EI and A&HCI per academic staff member (1.4%), citations per article on Nature, Science, SCI, SSCI, TSSCI, EI and A&HCI (1.5%), articles in peer-reviewed journals per academic staff member (1.4%), articles in international conferences per academic staff member (1.5%), publications of book per academic staff member(1.4%) 5.The dimension of student selectivity consists with:Acceptance Rate(4.9%), Entry score(6.6%) 6.The dimension of reputation consists with:peer assessment(4.0%), employer assessment(3.8%), graduate assessment(3.9%) 7.The dimension of performance of students and graduates consists with:the success of the student body at winning national academic awards within 5 years(3.7%), graduate employment(4.1%), correspondent (3.7%) 8.The dimension of financial resources consists with:revenue per student(4.8%), library spent per student 9.The dimension of internationalization consists with:percent of international students (excludes those who major in Chinese) (3.2%), percent of international academic staff member (3.0%), international cooperation projects(3.5%) 10.The dimension of internationalization consists with:attract students from underrepresented groups(2.8%), working hours at school per student (2.7%), expense as subvene for the poor students(3.3%) According to the conclusions, some suggestions had been proposed: 1.suggestions for higher education administrators 2.suggestions for those who are going to conduct university rankings 3.suggestions for university ranking information users 4.suggestions for further study.
252

基層警察人員裁量行為之認知研究 / The study of junior-ranking-police-officers’ discretionary behavior

葉正芊 Unknown Date (has links)
行政裁量議題研究一直為法學界與公共行政學界,討論公部門的研究核心重點之一,然法學界重其結果的影響性,公共行政學界重其組織中的運作。據此,無論官僚受到規則如何的嚴密監控,當工作授權下級,便會產生模糊的行使空間。因此,在公共行政的下的觀點,已非單純考量規則是否會造成侵害,更注重官僚本身行使時的價值及其限制性。 再者,本文以警察單位為研究對象,理由在於其依法行政時,面對社會事件,常考驗其判斷力與抉擇與人性面的挑戰,此一特色,與提供服務性質的公部門大不相同。但另一方面,為避免基層員警的裁量權使用不當,在取締告發、逮捕追緝等須受到法規與組織內部的約束。 本文視裁量權行使為決策行為的一種,對於影響個人裁量行為的問題,乃由工作面與個人行為約束面探討既有權限下對決策的影響力。從裁量執行的強度歸結出得過且過與執法不阿兩種行為類型。而影響行為選擇者,歸結出個人層面裡個人責任感、對工作的熟悉度;工作層面裡管理的嚴密度、行政課責及人情關係。統計結果發現,人口統計變項部分,裁量行為類型與專業類別、學歷及年紀的差異有關;而五個自變項對依變項均有顯著差異。 本文共計五章。第一章為諸論敘明研究動機、研究目的、研究方法與限制。第二章藉由分析現有研究而歸納出行政裁量研究之重點,整理出法制面、組織理論面與代理人理論面下不同的裁量觀。再者,由決策理論中檢視人類的行為研究,最後與警察人員作整合。第三章為研究設計。第四章以統計結果作變項間之關聯性探討,第五章整理出本文研究結果並提出政策建議。 本文由決策的描述面研究,在政策建議上較難提供完全有效的處方,但仍可由組織與個人兩方面著手思考相關配套。就組織面而言,管理者應對行政課責、管理技術作適當的調控;績效考核宜注重對工作熟悉度的正面義意;決策透明化與行政倫理的遵守,以化解人情的壓力;另外,養成教育過程中,除專業技能外,不能忽略行政倫理重要性;定期檢視法令變遷後,對程序的差異性。而在個人面,鼓勵成員對裁量困境的回饋;重視資深基層人員人力資源的經驗傳承;增進服務品質以提昇警察聲望。以期對基層員警運用於裁量行使的過程中,有助其豐富判斷力,得到較佳的結果。 / Discretion is a core issue in law, concerned with facts and consequences, while in public administration concerned with power operation in public organizations. In public administration aspect, discretion emphasizes on the values and limits in bureaucratic implementation rather than on the harm of rules. No matter how bureaucrats are strictly monitored by rules, the fact of blur in execution due to delegation of authority still exists. The object of this study focuses on the street-level bureaucrats, junior-ranking-police-officers. On the one hand, they often confront with social events in using discretionary power with their judgment. Sometimes they deal with the events and have to face the challenges on humanity side. On the other hand, in order to avoid the abuse of discretionary power, they are always restricted by rules and organizational norms in the execution of enforcement, informing violators and arresting suspects. This paper researches the issue of discretionary power in the aspects of job and individual. Dependent variables are consisted of soft enforcement and strict enforcement. Independent variables are those of the degree of strict management, the familiar of work, interaction of favoritism pressure, the responsibility of individual and administrative accountability. There are five chapters in this study. Chapter one is an introduction to study motives, purposes, research methods and limits et cetera. Chapter two is engaged to literature review reading the differences between discretion in law, organization and principal-agent aspects and the descriptive decision theory of heuristics in human daily life under uncertainty. Finally this study made effects to integrate them into the practices of junior-ranking-police-officers’ discretionary power. Chapter three is consisted of research design about research framework, hypotheses, questionnaire and its reliability and validity. Chapter four is discussed the statistical result. Chapter five is the conclusion and policy suggestion of this study. Because of applying descriptive approach, the finding of this study won’t provide for directly prescriptions for management, but they still could help us to understand real interactions in some way. For the management side, the balance art of management technology, administrative accountability, and job performance is important for managers. Secondly, better education makes better enforcement. Decision in transparent and administrative ethics could reduce improper outside pressure. Thirdly, an individual policeman should pay more attention on learning law enforcement. At last, policemen not only learn knowledge in ordinary time but give the dilemma feedback would be helpful for managers.
253

Filebos : En nyckel till Platons tankar omDet goda livet, belyst genom grottliknelsen?

Ringborg, Monika Margareta January 2015 (has links)
The purpose of this essay is to read Philebus based on three central themes – The Soul dialectic, the esoteric elements and some ethical problems, as well as to seek a comprehensive interpretation, rather than investigating, analyzing and interpreting individual concepts. Some questions that the essay aims to follow up are: 1) how can the dialogue on desire and rational knowledge highlighting Plato's ideas about the good life? 2) What are Plato’s real messages in the exposition of the good life? 3) Why are ethical questions related to esoteric elements of Plato's dialogues, and in general? The method is a reading between the lines; a hermeneutic interpretation process. Some patterns and contradictions were discovered during the reading, which shows an overall seemingly contradiction between ethics and metaphysics, but which with the the perspective of the dialectics be possible to reconcile. The final interpretation focuses on three concepts from Plato's own ranking of the good; beauty, proportion and truth. Together they constitute the good life in which pain plays an important role. Furthermore, it is possible to reach in Philebus about the good life, and the messages that one should always be true to oneself and to live modestly and always weigh reason to desire and choose wisdom. The ethical problems are both hidden in the shadows and elusive in Plato's dialogues, which can be a result of caution, but also a fear of losing oneself. Plato´s thinking is consistently dialectic, which is in this essay best illustrated by the allegory of the Cave.
254

Wandering ideal point models for single or multi-attribute ranking data: a Bayesian approach

Leung, Hiu-lan., 梁曉蘭. January 2003 (has links)
published_or_final_version / abstract / toc / Statistics and Actuarial Science / Master / Master of Philosophy
255

Χρήση θεματικών ταξινομιών για την αυτόματη δημιουργία και οργάνωση εξατομικευμένων καταλόγων διαδικτύου : ένας πρότυπος αλγόριθμος ταξινόμησης / Usage of thematic taxonomy for the automatic creation and organization of specialized network catalogs

Κρίκος, Βλάσης 16 May 2007 (has links)
Οι εξατομικευμένοι κατάλογοι διαδικτύου εμφανίστηκαν σχεδόν ταυτόχρονα με την εμφάνιση των φυλλομετρητών διαδικτύων, και από τότε όλοι οι φυλλομετρητές ενσωματώνουν απλά συστήματα διαχείρισης των εξατομικευμένων καταλόγων. Με τον όρο εξατομικευμένοι κατάλογοι εννοούμε τις προσωπικές συλλογές από ιστοσελίδες που ένας χρήστης διαδικτύου αποθηκεύει κατά την ώρα της πλοήγησης στον Παγκόσμιο Ιστό. Οι εξατομικευμένοι κατάλογοι διαδικτύου χρησιμοποιούνται σαν «προσωπικός χώρος πληροφορίας του δικτύου» για να βοηθούν τους ανθρώπους να θυμούνται και να ανακτούν ενδιαφέρουσες ιστοσελίδες από το διαδίκτυο. Στην εργασία αυτή παρουσιάζουμε ένα πρότυπο σύστημα διαχείρισης εξατομικευμένων καταλόγων διαδικτύου ορίζοντας τις προϋποθέσεις που πρέπει να πληρεί ώστε να είναι εύχρηστο και αποτελεσματικό. Το σύστημα αυτό έχει όλες τις δυνατότητες που έχουν τα εμπορικά αλλά και τα πρότυπα συστήματα διαχείρισης bookmarks. Επιπλέον διαθέτει καινοτόμες λειτουργίες που το καθιστούν μοναδικό. Παράλληλα παρουσιάζουμε αναλυτικά έναν πρότυπο αλγόριθμο κατάταξης, τον αλγόριθμο κατάταξης με βάση την συνάφεια των σελίδων με τις κατηγορίες στις οποίες ανήκουν. Τον αλγόριθμο αυτόν τον συγκρίνουμε με τον δημοφιλή αλγόριθμος γενικής κατάταξης το PageRank. Από το πείραμα που κάναμε προκύπτει ότι ο αλγόριθμος που προτείνουμε είναι πιο κατάλληλος για την ταξινόμηση των σελίδων σε θεματικές κατηγορίες από το PageRank. / The individualised lists of internet were presented almost simultaneously with the appearance of browser internets, and from then all browser incorporate simple systems of management of individualised lists. With the term individualised lists we mean the personal collections from web pages that a user of internet stores at the hour of pilotage in the World Web. The individualised lists of internet are used as \"personal space of information of network\" in order to they help the persons to remember and to recover interesting web pages from the internet. In this work we present a model system of management of individualised lists of internet horizon the conditions that should plirej
256

Η χρήση σημασιολογικών δικτύων για τη διαχείριση του περιεχομένου του παγκόσμιου ιστού / Managing the web content through the use of semantic networks

Στάμου, Σοφία 25 June 2007 (has links)
Η παρούσα διατριβή πραγματεύεται την ενσωμάτωση ενός σημασιολογικού δικτύου λημμάτων σ’ ένα σύνολο εφαρμογών Διαδικτύου για την αποτελεσματική διαχείριση του περιεχομένου του Παγκόσμιου Ιστού. Τα δίκτυα σημασιολογικά συσχετισμένων λημμάτων αποτελούν ένα είδος ηλεκτρονικών λεξικών στα οποία καταγράφεται σημασιολογική πληροφορία για τα λήμματα που περιλαμβάνουν, όπου τα τελευταία αποθηκεύονται σε μια δενδρική δομή δεδομένων. Ο τρόπος δόμησης του περιεχομένου των σημασιολογικών δικτύων παρουσιάζει αρκετές ομοιότητες με την οργάνωση που ακολουθούν οι ιστοσελίδες στον Παγκόσμιο Ιστό, με αποτέλεσμα τα σημασιολογικά δίκτυα να αποτελούν έναν σημασιολογικό πόρο άμεσα αξιοποιήσιμο από ένα πλήθος εφαρμογών Διαδικτύου που καλούνται να διαχειριστούν αποδοτικά το πλήθος των δεδομένων που διακινούνται στον Παγκόσμιο Ιστό. Μετά από επισκόπηση των τεχνικών που παρουσιάζονται στη διεθνή βιβλιογραφία για τη διαχείριση του περιεχομένου του Παγκόσμιου Ιστού, προτείνεται και υλοποιείται ένα πρότυπο μοντέλο διαχείρισης ιστοσελίδων, το οποίο κάνοντας εκτεταμένη χρήση ενός εμπλουτισμένου σημασιολογικού δικτύου λημμάτων, εντοπίζει εννοιολογικές ομοιότητες μεταξύ του περιεχομένου διαφορετικών ιστοσελίδων και με βάση αυτές επιχειρεί και κατορθώνει την αυτοματοποιημένη και αποδοτική δεικτοδότηση, κατηγοριοποίηση και ταξινόμηση του πλήθους των δεδομένων του Παγκόσμιου Ιστού. Για την επίδειξη του μοντέλου διαχείρισης ιστοσελίδων που παρουσιάζεται, υιοθετούμε το μοντέλο πλοήγησης στους θεματικούς καταλόγους του Παγκόσμιου Ιστού και καταδεικνύουμε πειραματικά τη συμβολή των σημασιολογικών δικτύων σε όλα τα στάδια της δημιουργίας θεματικών καταλόγων Διαδικτύου. Συγκεκριμένα, εξετάζεται η συνεισφορά των σημασιολογικών δικτύων: (i) στον ορισμό και εμπλουτισμό των θεματικών κατηγοριών των καταλόγων του Παγκόσμιου Ιστού, (ii) στην επεξεργασία και αποσαφήνιση του περιεχομένου των ιστοσελίδων, (iii) στον αυτόματο εμπλουτισμό των θεματικών κατηγοριών ενός δικτυακού καταλόγου, (iv) στην ταξινόμηση των ιστοσελίδων που έχουν δεικτοδοτηθεί στις αντίστοιχες θεματικές κατηγορίες ενός καταλόγου, (v) στη διαχείριση των περιεχομένων των θεματικών καταλόγων με τρόπο που να διασφαλίζει την παροχή χρήσιμων ιστοσελίδων προς τους χρήστες, και τέλος (vi) στην αναζήτηση πληροφορίας στους θεματικούς καταλόγους του Παγκόσμιου Ιστού. Η επιτυχία του προτεινόμενου μοντέλου επιβεβαιώνεται από τα αποτελέσματα ενός συνόλου πειραματικών εφαρμογών που διενεργήθηκαν στο πλαίσιο της παρούσας διατριβής, όπου καταδεικνύεται η συμβολή των σημασιολογικών δικτύων στην αποτελεσματική διαχείριση των πολυάριθμων και δυναμικά μεταβαλλόμενων ιστοσελίδων του Παγκόσμιου Ιστού. Η σπουδαιότητα του προτεινόμενου μοντέλου διαχείρισης ιστοσελίδων, έγκειται στο ότι, εκτός από αυτόνομο εργαλείο διαχείρισης και οργάνωσης ιστοσελίδων, συνιστά το πρώτο επίπεδο επεξεργασίας σε ευρύτερο πεδίο εφαρμογών, όπως είναι η εξαγωγή περιλήψεων, η εξόρυξη πληροφορίας, η θεματικά προσανατολισμένη προσκομιδή ιστοσελίδων, ο υπολογισμός του ρυθμού μεταβολής των δεδομένων του Παγκόσμιου Ιστού, η ανίχνευση ιστοσελίδων με παραποιημένο περιεχόμενο, κτλ. / This dissertation addresses the incorporation of a semantic network into a set of Web-based applications for the effective management of Web content. Semantic networks are a kind of machine readable dictionaries, which encode semantic information for the lemmas they contain, where the latter are stored in a tree structure. Semantic networks store their contents in a similar way to the organization that Web pages exhibit on the Web graph; a feature that makes semantic networks readily usable by several Web applications that aim at the efficient management of the proliferating and constantly changing Web data. After an overview of the techniques that have been employed for managing the Web content, we propose and implement a novel Web data management model, which relies on an enriched semantic network for locating semantic similarities in the context of distinct Web pages. Based on these similarities, our model attempts and successfully achieves the automatic and effective indexing, categorization and ranking of the numerous pages that are available on the Web. For demonstrating the potential of our Web data management model, we adopt the navigation model in Web thematic directories and we experimentally show the contribution of semantic networks throughout the construction of Web catalogs. More specifically, we study the contribution of semantic networks in: (i) determining and enriching the thematic categories of Web directories, (ii) processing and disambiguating the contents of Web pages, (iii) automatically improving the thematic categories of Web directories, (iv) ordering Web pages that have been assigned in the respective categories of a Web directory, (v) managing the contents of Web directories in a way that ensures the availability of useful Web data to the directories’ users, and (vi) searching for information in the contents of Web directories. The contribution of our model is certified by the experimental results that we obtained from a numerous of testing applications that we run in the framework of our study. Obtained results demonstrate the contribution of semantic networks in the effective management of the dynamically evolving Web content. The practical outcome of the research presented herein, besides offering a fully-fledge infrastructure for the efficient manipulation and organization of the Web data, it can play a key role in the development of numerous applications, such as text summarization, information extraction, topical-focused crawling, measuring the Web’s evolution, spam detection, and so forth.
257

IT žinių portalo reitingavimo modelis / Internet news portal ranking model

Vanagas, Kęstutis 16 August 2007 (has links)
Straipsnyje analizuojami egzistuojantys internetinių svetainių reitingavimo metodai. Sudarytas naujas internetinės svetainės reitingavimo modelis lanksčiai skaičiuoja reitinguojamų vienetų, tokių kaip vartotojai, talpinami straipsniai, reitingus, leidžia sistemai dirbti su minimaliu administruojančio asmens įsikišimu bei turi galimybę prapl��sti reitinguojamų vienetų aibę. Reitingavimo sistemos modelis taikomas publikuojamų žinių svetainės struktūrai ir savo pagrindinę funkcinę darbo dalį atlieka autonomiškai. / In this article we analyze existence web portal ranking methods. New web portal ranking model suggested which calculates ratings for ranking units, such as users or placed articles. Also this method works without administrative user intervention but has possibility to extend ranking units set without changing data collection structure in data base. This ranking model applicable for news web portal and mainly all functional work performs by itself.
258

Application of Fast Marching Methods for Rapid Reservoir Forecast and Uncertainty Quantification

Olalotiti-Lawal, Feyisayo 16 December 2013 (has links)
Rapid economic evaluations of investment alternatives in the oil and gas industry are typically contingent on fast and credible evaluations of reservoir models to make future forecasts. It is often important to also quantify inherent risks and uncertainties in these evaluations. These ideally require several full-scale numerical simulations which is time consuming, impractical, if not impossible to do with conventional (Finite Difference) simulators in real life situations. In this research, the aim will be to improve on the efficiencies associated with these tasks. This involved exploring the applications of Fast Marching Methods (FMM) in both conventional and unconventional reservoir characterization problems. In this work, we first applied the FMM for rapidly ranking multiple equi-probable geologic models. We demonstrated the suitability of drainage volume, efficiently calculated using FMM, as a surrogate parameter for field-wide cumulative oil production (FOPT). The probability distribution function (PDF) of the surrogate parameter was point-discretized to obtain 3 representative models for full simulations. Using the results from the simulations, the PDF of the reservoir performance parameter was constructed. Also, we investigated the applicability of a higher-order-moment-preserving approach which resulted in better uncertainty quantification over the traditional model selection methods. Next we applied the FMM for a hydraulically fractured tight oil reservoir model calibration problem. We specifically applied the FMM geometric pressure approximation as a proxy for rapidly evaluating model proposals in a two-stage Markov Chain Monte Carlo (MCMC) algorithm. Here, we demonstrated the FMM-based proxy as a suitable proxy for evaluating model proposals. We obtained results showing a significant improvement in the efficiency compared to conventional single stage MCMC algorithm. Also in this work, we investigated the possibility of enhancing the computational efficiency for calculating the pressure field for both conventional and unconventional reservoirs using FMM. Good approximations of the steady state pressure distributions were obtained for homogeneous conventional waterflood systems. In unconventional system, we also recorded slight improvement in computational efficiency using FMM pressure approximations as initial guess in pressure solvers.
259

J-model : an open and social ensemble learning architecture for classification

Kim, Jinhan January 2012 (has links)
Ensemble learning is a promising direction of research in machine learning, in which an ensemble classifier gives better predictive and more robust performance for classification problems by combining other learners. Meanwhile agent-based systems provide frameworks to share knowledge from multiple agents in an open context. This thesis combines multi-agent knowledge sharing with ensemble methods to produce a new style of learning system for open environments. We now are surrounded by many smart objects such as wireless sensors, ambient communication devices, mobile medical devices and even information supplied via other humans. When we coordinate smart objects properly, we can produce a form of collective intelligence from their collaboration. Traditional ensemble methods and agent-based systems have complementary advantages and disadvantages in this context. Traditional ensemble methods show better classification performance, while agent-based systems might not guarantee their performance for classification. Traditional ensemble methods work as closed and centralised systems (so they cannot handle classifiers in an open context), while agent-based systems are natural vehicles for classifiers in an open context. We designed an open and social ensemble learning architecture, named J-model, to merge the conflicting benefits of the two research domains. The J-model architecture is based on a service choreography approach for coordinating classifiers. Coordination protocols are defined by interaction models that describe how classifiers will interact with one another in a peer-to-peer manner. The peer ranking algorithm recommends more appropriate classifiers to participate in an interaction model to boost the success rate of results of their interactions. Coordinated participant classifiers who are recommended by the peer ranking algorithm become an ensemble classifier within J-model. We evaluated J-model’s classification performance with 13 UCI machine learning benchmark data sets and a virtual screening problem as a realistic classification problem. J-model showed better performance of accuracy, for 9 benchmark sets out of 13 data sets, than 8 other representative traditional ensemble methods. J-model gave better results of specificity for 7 benchmark sets. In the virtual screening problem, J-model gave better results for 12 out of 16 bioassays than already published results. We defined different interaction models for each specific classification task and the peer ranking algorithm was used across all the interaction models. Our research contributions to knowledge are as follows. First, we showed that service choreography can be an effective ensemble coordination method for classifiers in an open context. Second, we used interaction models that implement task specific coordinations of classifiers to solve a variety of representative classification problems. Third, we designed the peer ranking algorithm which is generally and independently applicable to the task of recommending appropriate member classifiers from a classifier pool based on an open pool of interaction models and classifiers.
260

A Global Ranking of Political Science and Public Administration Journals

Liu, Peilun 01 January 2015 (has links)
This paper conducts rankings on political science and public administration journals based on a database of citations for all articles within a set of 200 journals, during 2010-2013. This paper contributes to prior literature within the realm of Political Science, by tabulating journal rankings through non-traditional means. While rankings of political science and public administration journals have traditionally been dominated by a survey-based approach, recent advancements in technology have allowed researchers to conduct more subjective rankings based upon a bibliometric approach. However, the majority of these citational rankings utilize obscure metrics, which do not correspond directly to the number of citations a potential author can expect. This paper attempts to provide readers with more concrete metrics, which translate directly to how many citations an author can expect. This study tabulates journals based on three main metrics: Median Number of Citations, Citation Percentage, and 90th Percentile of Citations. This study identifies Transportation Research Part B, American Political Science Review, International Organization, American Journal of Political Science and Transportation Research Part A, as the top five journals within the set of 200 political science and public administration journals.

Page generated in 0.0516 seconds