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검색결과 497건 처리시간 0.026초

광경화성 수지의 온도 제어에 의한 광조형물의 형상 정밀도 향상 (Progress of the StereoLithography Product's Shape Accuracy by Temperature Control of the Resin)

  • 김성환;이은덕;백인환
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 춘계학술대회 논문집
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    • pp.808-811
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    • 2000
  • The product of stereolithography is consist of gathering the single strand. Therefore the accuracy of the shape is related to the linear shrinkage of the single strand. The resin temperature change affect on curing properties. This article will propose the interaction between material temperature and shape accuracy by resin temperature control. The main concern of this article is related to the improvement of end product's shape accuracy by the persuit for the filles curing criterion.

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The Effect of Network Position on the Efficiency of Open Collaboration: A Study of Wikipedia Featured Article Edits

  • Naveed Khan;Jongwoo Kim;Hong Joo Lee
    • Asia pacific journal of information systems
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    • 제29권1호
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    • pp.50-64
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    • 2019
  • The success of Wikipedia is due to the large number of volunteers collaborating to provide content to Wikipedia articles. In this paper, we study the effect of network position on the promotion of an article to a featured article. We focus on the edits of featured Wikipedia articles to study the effects of the centrality of editors and centrality of articles on the promotion of featured articles. Considering the editing precedence among editors within an article, editor collaboration networks for a single article are generated using the total English-written featured articles on Wikipedia. In addition, based on the affiliation network of editors and articles, an article-to-article network and an editor-to-editor collaboration network are constructed. Based on the investigation of the networks, we find that article centrality in an article-to-article network has a negative effect on the promotion of an article, and editor centrality in an article-to-article networks has a positive effect on promotion. In addition, editor centrality in an editor-to-editor network has a negative effect on promotion. Some theoretical and managerial implications are provided in view of these results.

Recent Progress of Spray-Wall Interaction Research

  • Lee Sang-Yong;Ryu Sung-Uk
    • Journal of Mechanical Science and Technology
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    • 제20권8호
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    • pp.1101-1117
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    • 2006
  • In the present article, recent progress of spray-wall interaction research has been reviewed. Studies on the spray-wall interaction phenomena can be categorized mainly into three groups: experiments on single drop impact and spray (multiple-drop) impingement, and development of comprehensive models. The criteria of wall-impingement regimes (i.e., stick, rebound, spread, splash, boiling induced breakup, breakup, and rebound with breakup) and the post-impingement characteristics (mostly for splash and rebound) are the main subjects of the single-drop impingement studies. Experimental studies on spray-wall impingement phenomena cover examination of the outline shape and internal structure of a spray after the wall impact. Various prediction models for the spray-wall impingement phenomena have been developed based on the experiments on the single drop impact and the spray impingement. In the present article, details on the wall-impingement criteria and post-impingement characteristics of single drops, external and internal structures of the spray after the wall impact, and their prediction models are reviewed.

One Hundred Scopus Citations to a Non-Scopus Indexed Article: A Case Study

  • Bakthavachalam Elango
    • Journal of Information Science Theory and Practice
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    • 제11권4호
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    • pp.82-91
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    • 2023
  • Receiving 100 citations from indexed journals is not a common occurrence, although it does happen very rarely, and it is even more uncommon for a non-indexed article. Given this, the purpose of this present study is to perform a bibliometric analysis of 100 cited Scopus articles to a non-Scopus indexed article, using a case study of the article titled "Authorship trends and collaboration pattern in the marine sciences literature: A scientometric study" which was published by Elango and Rajendran in the International Journal of Information Dissemination and Technology in 2012. On October 15, 2022, the Scopus database was searched with the article title in the references field, and the resulting bibliographic data was exported as a comma-separated values file. The tools utilized for this analysis were ScientoPy, the Bibliometrix R Package, and VOSviewer. Based on the findings, most of the cited articles were published within the last three years, and international researchers have given more recognition compared to Indian researchers. The most popular topics were found to be bibliometrics, bibliometric analysis, and bibliometrix. The fact that all 100 cited articles were published across various subject disciplines used by Scopus to categorise sources demonstrates how well-established the citing article is within the scientific community.

한국에서의 의료보험조합 통합일원화 논의의 정치 : 정책 네트워크, 옹호연합, 그리고 보건의료 정책형성의 동태성 (The Political Dynamics of Policy Networks and Advocacy Coalitions in South Korea's Healthcare Policymaking : The 20 Years of Debates to Inaugurate a Single-Payer System)

  • 김순양
    • 사회복지연구
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    • 제42권4호
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    • pp.61-102
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    • 2011
  • 본 연구는 정책네트워크모형과 옹호연합모형을 결합하는 통합적 분석틀을 통하여 의료보험조합 통합일원화 논쟁의 정치적 동태성을 분석하고자 하는 것이다. 이를 위하여 본 연구는 환경적 맥락, 정책 네트워크, 옹호연합, 그리고 정책산출로 이어지는 체계적이고 과정지향적인 관점에 입각하여 분석틀을 구축하였다. 연구범위는 1980년대 초부터 촉발되어 20년 이상에 걸쳐서 진행된 통합일원화 논쟁의 전 과정이다. 그리고 본 연구에서는 논쟁의 과정을 1980년대 초반의 제1차 의보통합논쟁, 1980년대 후반의 국민의료보험법 제정, 1990년대 중반 김영삼 정부하의 의료보험조합 부분통합, 그리고 1990년대 말 이후 김대중 정부 하에서 종결된 의료보험조합의 완전통합이라는 네 단계로 구분하고, 각 단계별로 정책형성의 동태성을 비교 분석하였다.

Understanding radiation effects in SRAM-based field programmable gate arrays for implementing instrumentation and control systems of nuclear power plants

  • Nidhin, T.S.;Bhattacharyya, Anindya;Behera, R.P.;Jayanthi, T.;Velusamy, K.
    • Nuclear Engineering and Technology
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    • 제49권8호
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    • pp.1589-1599
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    • 2017
  • Field programmable gate arrays (FPGAs) are getting more attention in safety-related and safety-critical application development of nuclear power plant instrumentation and control systems. The high logic density and advancements in architectural features make static random access memory (SRAM)-based FPGAs suitable for complex design implementations. Devices deployed in the nuclear environment face radiation particle strike that causes transient and permanent failures. The major reasons for failures are total ionization dose effects, displacement damage dose effects, and single event effects. Different from the case of space applications, soft errors are the major concern in terrestrial applications. In this article, a review of radiation effects on FPGAs is presented, especially soft errors in SRAM-based FPGAs. Single event upset (SEU) shows a high probability of error in the dependable application development in FPGAs. This survey covers the main sources of radiation and its effects on FPGAs, with emphasis on SEUs as well as on the measurement of radiation upset sensitivity and irradiation experimental results at various facilities. This article also presents a comparison between the major SEU mitigation techniques in the configuration memory and user logics of SRAM-based FPGAs.

편모가족의 가족자원, 대처와 스트레스 (Single Mother Family's Family Resources, Coping and Stress)

  • 김경신
    • 대한가정학회지
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    • 제35권4호
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    • pp.211-228
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    • 1997
  • The purposes of this article were to find the general trends of single mothers and their children's stress family resources and coping to estimate the correlation among variables and to analyze the effects of related variables family resources influencing coping and stress. The data were analyzed from the 566 single mothers and their children living in Kwang-ju. The major findings were as follow; 1. Scores of single mothers' and their children's stress family resources were lower than median. But scores of single mothers' coping were higher than median. Their problem-solving coping were higher than emotional coping. 2. Widowed single mothers' stress were related to family resources and emotional coping. Divorced single mothers' stress were related to emotional coping. Children's stress were related to emotional coping. Single mother's stress coping were related to stress of children. 3. Single mothers' coping were influenced by financial well-being family strength I and family strength II. Children's coping were influenced by number of friend. Single mothers' stress were influenced by education financial well-being. Children's stress were influenced by their mothers' education friendship satisfaction and school achievement satisfaction.

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에너지 절약형 주택단지 설계기법에 관한 연구 (II) (A Study on an Energy-Effective Site Planning for a Residential Environment(II))

  • 양병이;김기호
    • 한국조경학회지
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    • 제13권1호
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    • pp.25-42
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    • 1985
  • The objective of this article is to develop residential site planning techniques for the energy conservation by focusing on energy conscious site design process, influencing natural factors for energy conservation and suggestion of multi - family housing Prototypes. This article is the second part of the article titled "A Study on an Energy - Effective Site Planning for a Residential Environment"which is published in the previous issue (Vol. 12, No. 2) of this journal. The first part of the article dealt with how to make best use of energy conserving effect of natural forces such as sun, wind and water, and the selection techniques of suitable residential site for achieving energy conservation. The second part proposes the energy conscious design process of residential site development and suggests building forms of single family and multi -family housings. The three multi - family housing prototypes haute been developed which are most energy -effective ; the linear type, the cut -de -sac type and the atrium type. In the process of creating the prototypes, energy conserving design criteria have been also developed. These criteria can be used to develop some other alternative prototypes.

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A hollow definitive obturator fabrication technique for management of partial maxillectomy

  • Patil, Pravinkumar Gajanan;Patil, Smita Pravinkumar
    • The Journal of Advanced Prosthodontics
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    • 제4권4호
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    • pp.248-253
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    • 2012
  • Maxillary obturator prosthesis is the most frequent treatment option for management of partial or total maxillectomy. Heavy weight of the obturators is often a dislocating factor. Hollowing the prosthesis to reduce its weight is the well established fact. The alternate technique to hollow-out the prosthesis has been described in this article which is a variation of previously described processing techniques. A pre-shaped wax-bolus was incorporated inside the flasks during packing of the heat-polymerized acrylic resin to automatically create the hollow space. The processing technique described is a single step flasking procedure to construct a closed-hollow-obturator prosthesis as a single unit. To best understand the technique, this article describes management of a patient who had undergone partial maxillectomy secondary to squamous cell carcinoma rehabilitated with a hollow-obturator prosthesis.

편모의 스트레스와 심리적 복지 (Single Mothers' Stress and Psychological Well-being)

  • 김경신
    • 대한가정학회지
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    • 제36권2호
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    • pp.19-34
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    • 1998
  • The purposes of this article were to find the general trends of single mothers' stressor, self-esteem, family resources, coping, stress and psychological well-being, and to test a causal model of family resources, coping and stress influencing on psychological well-being. The data were analyzed from the 283 single mothers living in Kwang-ju. The major findings were as follows; 1. Scores of single mothers' stress, family resources were lower than median. But scores of single mothers' stressor, self-esteem, coping, life satisfaction and depression were higher than median. Their problem-focused coping scores were higher than emotion-focused coping. 2. Single mothers' life satisfaction were directly affected by self-esteem, family resources, problem-focused coping and stress, and were indirectly affected by stressor, emotion-focused coping. Single mothers' depression were directly influenced by self-esteem, family resources, emotion-focused coping, problem-focused coping and stress, and were indirectly influenced by stressor.

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