• 제목/요약/키워드: Design theory

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평행링크 매니퓰레이터의 강인한 QFT(Quantitative Feedback Theory)제어기 설계 (Robust QFT(Quantitative Feedback Theory) Controller Design of Parallel Link)

  • 강민구;변기식
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 D
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    • pp.2249-2251
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    • 2001
  • This paper proposes that it minimizes interference between link at high speed trajectory tracking of 2-degree parallel link manipulator and QFT(Quantitative Feedback Theory) controller which robust structure uncertainty and disturbance of plant. And using ICD(Individual Channel Design), it separates two channel from multivariable system, parallel link manipulator and designs robust controller with applying MISO QFT to each channel. Finally, we make sure of robustness and excellence of QFT controller through simulation and experiment.

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최적설계법을 응용한 가스계 소화설비의 약제방출량 산출 (Application of Optimal Design Method to Agent Discharge Flow Calculation of Gaseous Fire Extinguishing Systems)

  • 이동명
    • 한국화재소방학회논문지
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    • 제29권5호
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    • pp.51-56
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    • 2015
  • 본 연구에서는 설계프로그램의 공학적 분석의 수단 또는 가치공학 측면에서 원가절감 등의 목적으로 최적설계 이론과 공학적 이론을 접목시킨 최적설계법을 가스계 소화설비 중 청정소화약제 소화설비의 약제방출량 산출에 응용하였다. 청정소화약제 소화설비의 설계이론과 최적설계 이론을 바탕으로 약제방출량을 최적화시킬 수 있는 최적설계인자를 도출하였고, 이를 설계인자로 구축된 소화설비의 소화성능시험으로 최적설계법의 적합성 여부를 검증함으로써 다른 소화설비에도 최적설계법을 접목할 수 있는 기틀을 마련하였다. 방출헤드의 약제방출량 최적화는 방출헤드 및 배관의 내경, 약제도달시간, 유량과 압력변화 등의 소화약제 유동특성에 대한 제한조건에 의해 결정됨을 확인하였고, 방출헤드의 방출압력과 약제도달시간의 편차는 배관의 압력변화만큼 발생되고 상관관계가 있음을 알 수 있었다.

정보체계 탐구.평가의 철학적 분석 모델과 그 방법론적 활용: 비판 실재론적 접근 (A Study on the Philosophical Analysis Model and its Methodological Application of Information Systems Research.Evaluation - A Critical Realist Approach -)

  • 고창택
    • 한국정보시스템학회지:정보시스템연구
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    • 제16권4호
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    • pp.131-155
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    • 2007
  • The purpose of this thesis is to study on the philosophical analysis model and its methodological application of information systems research evaluation from critical realist perspective. Fist of all, I examine ontological epistemological methodological assertions of critical realism. Because the philosophy of critical realism is an opportunity for information systems study. I examine Dobson and Mutch's critical realist perspective on actors-structure model. I suggest a critical realist actors-praxis-structure model. This model provides the potential for a new approach to social investigations in its provision of an ontology for the analytical separation of structure and agency. Of most importance might be the incorporation of non-humans into the analysis of social interaction and of technology into the elaboration of structures. I also examine Tsoukas's critical realistic meta-theory of management. I suggest a critical realist IS management model. This model elucidate the nature of management and delineate the scope of applicability of various perspectives on management. The causal powers of management reside in the real domain and, taken together, their logics are contradictory, the effects of their contradictory composition are contingent upon prevailing contingencies. I analyze Carlsson's theory of design knowledge. His framework builds on that the aim of IS design science research is to develop practical knowledge for the design and realization of different classes of IS initiatives, where IS are viewed as socio-technical systems and not just IT artefacts. The framework proposes that the output of IS design science research is practical IS design knowledge in the form of field-tested and grounded technological rules. The IS design knowledge is developed through an IS design science research cycle. In conclusion, I think that IS actors-praxis-structure model, meta-theoretical IS management model, and IS design knowledge model according to critical realistic approach are very useful for IS research evaluation. Nevertheless, important problems are left not resolved.

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효과적인 실험 교육을 위한 수업 모형 (An Instructional Model for Effective Experimental Education)

  • 유동상
    • 실천공학교육논문지
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    • 제11권2호
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    • pp.143-150
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    • 2019
  • 회로 이론은 전기 및 전자 공학 분야에서 가장 기본이 되는 다양한 회로의 해석과 설계를 체계화한 학문으로 회로 이론 교과목은 전기 및 전자 공학도라면 반드시 습득하도록 4년제 대학을 기준으로 학부 2학년에 한 학기 내지는 2 학기에 걸쳐 전공 교과목으로 편성되어 있다. 또한 학생들이 회로 이론에 대한 이해도를 높이고, 실제 회로를 구성한 실험을 통하여 회로 설계에 대한 기술 및 응용력을 습득할 수 있도록 하는 실험 교과목이 이론 교과목을 뒷받침하기 위해 동반 편성되고 있다. 본 논문에서는 회로 이론을 뒷받침하는 실험 교육에 대한 학습 효과를 높이기 위해 전기회로 설계 및 실험 교과목에서 시행하고 있는 수업 방법에 대한 사례 연구에 대해 기술한다. 이를 위해 이론 학습, 시뮬레이션, 실험 및 설계 프로젝트 등이 복합적으로 구성된 15주 수업 모형을 제안한다. 제시된 수업 모형에서는 이론을 보완하기 위한 시뮬레이션과 사전 실험 준비 과정이 강화되고, 공학 엔지니어로서의 실질적인 회로 설계 능력을 배양하기 위한 설계 프로젝트가 도입되어 운영된다. 5년 동안의 운영 결과는 제안된 모형이 효용성이 있음을 보여준다.

중계국용 DR(Dielectric Resonator) 세라믹 대역통과 필터 설계 및 시뮬레이션 (Design and Simulation of the DR(Dielectric Resonator) Ceramic Band-Pass Filter for Basestation)

  • 김지균;이헌용
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 D
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    • pp.1922-1924
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    • 1999
  • The purpose of this study is to establish the design theory of a DR ceramic bandpass filter used for basestations and to research on the design theory of bandpass filter. The design procedure is circuit parameters and structural parameters will be derived. It was observed that the filter characteristics at the simulations.

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무인 표적기 프로펠러의 최적 설계 II (Design of optimum propeller for target drone II)

  • 성형건;노태성
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2003년도 제21회 추계학술대회 논문집
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    • pp.246-249
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    • 2003
  • 무인 표적기에 탑재될 추진 시스템인 프로펠러를 설계하였다. 프로펠러 설계 방법으로 Vortex theory를 적용하였으며 설계 변수에 따른 프로펠러 성능을 해석하였다. 최적 설계 목표는 효율의 최대화이며, 또한 설계된 프로펠러의 성능을 해석하였다.

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WLL(Wireless Local Loop) 기지국용 DR(Dielectric Resonator) 세라믹 대역통과 필터 설계와 시뮬레이션 (Design and simulation of the DR ceramic bandpass filter for WLL(Wireless Local Loop) basestation)

  • 김지균;이헌용
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1999년도 추계학술대회 논문집
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    • pp.315-318
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    • 1999
  • The purpose of this study is to establish the design theory of a DR ceramic bandpass filter used for WLL basestations and to research on the design theory of bandpass filter. The design procedure is circuit parameters and structural parameters will be derived. It was observed that the filter characteristics at the simulations

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노르베르크-슐츠의 건축 현상학이 갖는 의의와 한계 (A Study on the Meaning and Limitations of Architectural Phenomenology of Norberg-Schulz)

  • 정태용
    • 한국실내디자인학회논문집
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    • 제25권6호
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    • pp.89-97
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    • 2016
  • The aim of this study is to review Norberg-Schulz's architectural phenomenology to find out its meaning and limitations in contemporary architecture. His phenomenological trilogy, 'Existence, Space and Architecture', 'Genius Loci' and 'The Concept of Dwelling' are main texts to examine background, characteristics, meaning and limitations of his theory in relation to Structuralism and Heidegger's thoughts. Heidegger's phenomenology, especially his dwelling concept, had great impacts on forming Norberg-Schulz's architectural phenomenology. However, since his architectural phenomenology was strongly influenced by Structuralism, his theories present unstable combination of phenomenology and semiotics. And this results in instrumentalization, and overlooking body movement and socio-economical elements in his theory. In spite of these limitations, his theory also shows possibility to go beyond the theory of Modern architecture and plays important role in suggesting direction for better environment through applicability from single building to city in Postmodern architecture. Another meaning of his theory lies in presenting theoretical background for new way to interpret regionalism and specific policy tool to make town planning in Finland.

MIS 논문의 '게재 불가' 및 '수정 후 재심사' 사유: Asia Pacific Journal of Information Systems 심사소견서 분석 (Why Your Manuscripts Were Rejected or Required a Major Revision: An Analysis of Asia Pacific Journal if Information Systems)

  • 이중정;윤혜정;황성훈
    • Asia pacific journal of information systems
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    • 제19권2호
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    • pp.179-193
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    • 2009
  • As the common saying attests, a publish-or-perish world, publishing is absolutely critical for academic researchers' successful careers. It is the most objectively-accepted academic performance criteria and the most viable way to attain public and academic recognition. Asia Pacific Journal of Information Systems(APJIS) has been recognized as the most influential domestic journal in Korean MIS field since July, 1991. Therefore, publishing in APJIS means your research is original, valid, and contributive. While most researchers learn how to publish an article in APJIS through a repetitive review process, thereby improving their chance of the' accepted' through their personal trial and error experiences, such valuable lessons and know-how tend to be kept personally and rarely shared. However, useful insights into research and publication skills could be also gained from sharing others' errors, neglect, and misjudgments which are equally critical in improving researchers' knowledge in the field (Murthy and Wiggins, 2002). For this reason, other academic disciplines make systematic efforts to examine the paper review process of major journals and share the findings from these studies with the rest of the research community members (Beyer et al., 1995; Cummings et al, 1985; Daft, 1995; Jauch and Wall, 1989; Murthy and Wiggins, 2002). Recognizing the urgent need to provide such type of information to MIS research community in Korea, we have chosen the most influential academic journal, APJIS with an intention to share the answer to the following research question: "What are the common problems found in the manuscripts either 'rejected' or 'required a major revision' by APJIS reviewers?" This study analyzes the review results of manuscripts submitted to APJIS (from January, 2006 to October, 2008), particularly those that were 'rejected' or required a 'major revision' at the first round. Based on Daft's(1995) study, twelve most-likelihood problems were defined and used to analyze the reviews. The twelve criteria for classification, or "twelve problems", are as follows: No theory, Concepts and operationalization not in alignment, Insufficient definition--theory, Insufficient rationale--design, Macrostructure--organization and flow, Amateur style and tone, Inadequate research design, Not relevant to the field, Overengineering, Conclusions not in alignment, Cutting up the data, and Poor editorial practice. Upon the approval of the editorial board of APJIS, the total 252 reviews, including 11 cases of 2005 and 241 cases from July, 2006 to October, 2008, were received without any information about manuscripts, authors, or reviewers. Eleven cases of 2005 were used in the pilot test because the data of 2005 were not in complete enumeration, and the 241 reviews (113 cases of 'rejection' and 128 ones of 'major revision') of 2006, 2007, and 2008 were examined in this study. Our findings show that insufficient rationale-design(20.25%), no theory(18.45%), and insufficient definition--theory(15.69%) were the three leading reasons of 'rejection' and 'major revision.' Between these two results, the former followed the same order of three major reasons as an overall analysis (insufficient rationale-design, no theory, and insufficient definition-theory), but the latter followed the order of insufficient rationale--design, insufficient definition--theory, and no theory. Using Daft's three major skills-- 'theory skills', 'design skills', and 'communication skills'-- twelve criteria were reclassified into 'theory problems', 'design problems', and 'communication problems' to derive more practical implications of our findings. Our findings show that 'theory problems' occupied 43.48%, 'design problems' were 30.86%, and 'communication problems' were 25.86%. In general, the APJIS reviewers weigh each of these three problem areas almost equally. Comparing to other disciplines like management field shown in Daft's study, the portion of 'design problems' and 'communication problems' are much higher in manuscripts submitted to the APJIS than in those of Administrative Science Quarterly and Academy of Management Journal even though 'theory problems' are the most predominant in both disciplines.

DESIGNING AUTOMOTIVE GEAR OILS FOR THE NEW MILLENNIUM

  • Hong, Hyun-Soo
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2000년도 제32회 추계학술대회 정기총회
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    • pp.134-154
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    • 2000
  • New engine design changes and ever increasing requirements make the design of gear oils challenging. Proper understanding of fundamental lubrication theory and formulation knowledge is necessary to develop new gear oils. This paper provides an overview on fundamentals of lubrication theory and functions of each additive. Also, key technical issues facing gear oils are discussed.

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