• Title/Summary/Keyword: Integrated assembly

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Indirect Adaptive Decentralized Learning Control based Error Wave Propagation of the Vertical Multiple Dynamic Systems (수직다물체시스템의 오차파형전달방식 간접적응형 분산학습제어)

  • Lee Soo-Cheol
    • Proceedings of the Korea Society for Industrial Systems Conference
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    • 2006.05a
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    • pp.211-217
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    • 2006
  • The learning control develops controllers that learn to improve their performance at executing a given task, based on experience performing this specific task. In a previous work, the authors presented an iterative precision of linear decentralized learning control based on p-integrated learning method for the vertical dynamic multiple systems. This paper develops an indirect decentralized learning control based on adaptive control method. The original motivation of the teaming control field was teaming in robots doing repetitive tasks such as on an assembly line. This paper starts with decentralized discrete time systems, and progresses to the robot application, modeling the robot as a time varying linear system in the neighborhood of the nominal trajectory, and using the usual robot controllers that are decentralized, treating each link as if it is independent of any coupling with other links. Error wave propagation method will show up in the numerical simulation for five-bar linkage as a vertical dynamic robot. The methods of learning system are shown up for the iterative precision of each link at each time step in repetition domain. Those can be helped to apply to the vertical multiple dynamic systems for precision quality assurance in the industrial robots and medical equipments.

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Review on Clinical Study of Oriental Medical Treatment for Cancer in Korea (국내 한의학 암치료 임상연구 논문에 대한 고찰)

  • Kim, Jong-Han;Park, Dong-Suk;Kim, Yong-Suk;Lee, Jae-Dong
    • Journal of Acupuncture Research
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    • v.29 no.3
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    • pp.19-28
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    • 2012
  • Objectives : The aim of this study is to evaluate present clinical evidence of oriental medical treatment for cancer in Korea. Method : A search was performed in the Korean Studies Information, Korea Institute of Science and Technology Information, KoreaMed, Oriental Medicine Advanced Searching Integrated System, National Assembly Library, RISS4u, DBPIA, and Oasis using the keyword 'cancer', 'leukemia', 'malignant tumor', 'lymphoma', 'multiple myeloma', 'melanoma'. The search period spanned between Jan 1, 1980~June 30, 2011 and the results were analyzed and evaluated according to the publication date, journal, method of treatment, type of study, and the primary outcome. Randomized clinical trials (RCTs) and Non randomized clinical trial(NRCT) were reviewed separately. Result : The results yielded 133 trials during the period of Jan 1, 1980~June 30, 2011. Most of the trials were concerned with lung cancer and 94 of the trials were simple case studies or case series studies. 61 trials used herbal Formula/herbal medicine as the primary method of treatment. A total of 4 RCTs existed compared to only one NRCT. Conclusion : The use of oriental medicine for the treatment of cancer is gaining popularity in the field of medical scientific research. However most of the studies that have been published up to date are mostly case studies or case series studies, and RCT/NRCT are rare. In order to provide appropriate evidence regarding the effectiveness of oriental medicine in the treatment of cancer, more rigorous and well-designed studies are warranted.

Fabrication of Hollow Micro-particles with Nonspherical Shapes by Surface Sol-gel Reaction (표면 솔-젤 반응을 활용한 마이크로미터 크기의 비구형상 공동 입자의 제조)

  • Cho, Young-Sang;Jeon, Seog-Jin;Yi, Gi-Ra
    • Korean Chemical Engineering Research
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    • v.45 no.6
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    • pp.611-618
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    • 2007
  • We demonstrate the sol-gel coating technique of colloidal clusters for producing hollow micro-particles with complex morphologies. Cross-linked amidine polystyrene (PS) microspheres were synthesized by emulsifier-free emulsion copolymerization of styrene and divinylbenzene. The amidine PS particles were self-organized inside toluene-in-water emulsion droplets to produce large quantities of colloidally stable clusters. These clusters were coated with thin silica shell by sol-gel reaction of tetraethylorthosilicate (TEOS) and ammonia, and the organic polystyrene cores were removed by calcination at high temperature to generate nonspherical hollow micro-particles with complex morphologies. This process can be used to prepare hollow particles with shapes such as doublets, tetrahedra, icosahedra, and others.

자동차 ALC에 대응하는 Job Shop의 동기화 생산시스템에 관한 연구

  • 권보식;김경섭
    • Proceedings of the Korea Society for Simulation Conference
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    • 1997.04a
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    • pp.100-100
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    • 1997
  • 본 연구에서는 우리 자동차산업이 직면한 총체적인 위기상황을 극복하기 위한 방 안으로, 자동차 생산방식의 변혁, 인적자원관리의 혁신을 통한 생산성 제고, 독자 기술개발 능력의 조기확보, 효율적인 부품조달체제의 형성 등 산업전반에 걸친 혁신으로, 내적인 경 쟁력을 축적함과 동시에, 지역주의화의 진전에 따른 수출 여건의 악화를 극복하기 위해 선 진권 및 개발도상국으로의 현지화 노력이 적극적으로 추진되지 않으면 안될, 중대한 시점에 와 있다고 진단하면서, 본 연구의 목적을, 생산현장을 중심으로 한 내적 경쟁력 확보로 정 의하고, 그 실현방안으로서, 급변하는 시장환경에 적극 대응하기 위한 생산방식의 도입과, 이를 지원하는 생산정보시스템의 구축 모델을 제시하고자 한다. 첫 번째는, 변화가 급격한 시장환경에 적극 대응하는 생산방식의 도입으로, 철저한 낭비 배제 사상 - 생산현장의 낭비 소요를 배제(개선)하는 것만이 아니라 배제하고 바로 체계를 바꾸어 (개혁) 원래의 상태로 되돌아가지 않도록 하는 -을 기본으로, 정보, 관리, 생산, 제품, 물류 등에 관련된 손실 비 용을 감축시킴으로서 원가를 낮추고, 고객이 요구하는 다양하고, 좋은 품질이 제품을 신속 히 공급할 수 있는 체계를 갖추는 것이다. 이러한 낭비 배제 사상은 생산현장에서 필요한 것을, 필요한 때에, 필요한 만큼 만들고 운반하며 전달하는 관리 개선 등을 의미하며, 이것 을 적은 인원 및 설비로 최대한 빨리 (리드 타임의 단축), 계획대로 수행하도록 하는 것이 동기화 생산방식이다. 따라서, 본 연구에서는 자동차 생산공정 중 주 조립공정의 ALC(Assembly Line Control)에 대응하여, 선행 공정으로서 부품을 공급하는 Job Shop의 동기화 생산방식을 실제 적용한 사례 중심으로 전개하고자 한다. 두 번째의 접근방식은, 동 기화 생산방식에 컴퓨터 통합생산 (CIM, Computer Integrated Manufacturing)의 기술을 구 현, 적용하는 것이다. 즉, 동기화 생산 시스템 (SPS, Syncronized Production Sytem)을 구 축하는 것인데, 이것은 최신의 컴퓨터 기술을 생산현장에 적용함으로써 새로운 생산방식의 혁신에 버금가는 기술혁신이라 할 수 있을 것이다. 따라서, 이러한 접근은 컴퓨터 및 통신 기술의 눈부신 발전을 기초로 가능해진 것인데, 제조업에서의 심각한 고비용, 저효율 문제 를 해결하기 위해 필수적으로 도입해야만 하는 실정이다. 또한 소비자의 다양한 요구로 인 하여 제품의 종류와 사양면에서 심한 변동을 보이는 시장 수요에, 신속한 정보처리로 대응 하는데도 크게 기여하고 있다. 이에 본 연구에서는, 자동차 Job Shop의 동기화 생산방식을 지원하는 동기화 생산시스템의 구축 모델을 제시하고자 한다.

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Nonhermetic Plastic Packaged Optical Modules of Passive Optical Fiber Alignment Method (수동 광섬유정렬을 이용한 Nohermetic 플라스틱 패키지 광모듈)

  • Lim, Dong-Cheol;Lee, Won-Jong;Kang, Suk-Youb;Park, Hyo-Dal
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.11A
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    • pp.1053-1058
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    • 2006
  • In this paper, We proposed a efficient OSA(Optical Sub-Assembly) packaging method in use 1.31/1.49um bi-directional hybrid-integrated PLC chip for low-cost OSA in optical access network system applications as GE-PON in FTTH. Fabricated OSA with passive optical fiber alignment and nonhermetic plastic package method and measured optical coupling efficiency and electric-optical characteristics. Its performance is feasible to satisfy the GE-PON ONU specifications with the results as less than 0.5dB coupling losses within 40um alignment of z-axis and less than -24dBm sensitivity. It also has good temperature characteristics to sustain optical output power more than 1.5mW and 10dB extinction ratio, less than 0.3dB tracking error.

Integrate Processing Scheme of Flow Control Language (흐름 제어 언어의 통합 처리)

  • Kim, Tae-Wan;Chang, Chun-Hyon
    • The KIPS Transactions:PartD
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    • v.11D no.2
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    • pp.415-422
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    • 2004
  • Automation systems improve the productivity of works which relate to product design, facilities management, fault processing and quality evaluation. In these systems, the description language for monitoring and control process is called new control language. These are five flow control languages : IL, ST, FBD, SFC and LD. IL and ST are based on left form. FBD, SFC and LD are based on graphic form. Generally, a software which monitors and controls a system is allowed to use just one flow control language. It is impossible to use more than two languages for simulation in the same system environment. In this paper, we analyzed the characteristics of flow control languages and the process of programming in the legacy system. In addition, for the Integrated processing of languages, we propose Extended ST based on the high-level ST language. Based on this research, we implement a graphical language editor and EST-IL convertor. The graphical language editor makes sequence rules, and converts graphical language into EST. EST-IL convertor has a function to convert EST into IL which is similar to assembly language. As the result of this paper, we present a scheme which integrates all the flow control language processing based on IL.

Quality Assurance of Repeatability for the Vertical Multiple Dynamic Systems in Indirect Adaptive Decentralized Learning Control based Error wave Propagation (오차파형전달방식 간접적응형 분산학습제어 알고리즘을 적용한 수직다물체시스템의 반복정밀도 보증)

  • Lee Soo-Cheol
    • Journal of Korea Society of Industrial Information Systems
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    • v.11 no.2
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    • pp.40-47
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    • 2006
  • The learning control develops controllers that learn to improve their performance at executing a given task, based on experience performing this specific task. In a previous work the authors presented an iterative precision of linear decentralized learning control based on p-integrated teaming method for the vertical dynamic multiple systems. This paper develops an indirect decentralized learning control based on adaptive control method. The original motivation of the loaming control field was learning in robots doing repetitive tasks such as on a]1 assembly line. This paper starts with decentralized discrete time systems, and progresses to the robot application, modeling the robot as a time varying linear system in the neighborhood of the nominal trajectory, and using the usual robot controllers that are decentralized, treating each link as if it is independent of any coupling with other links. Error wave propagation method will show up in the numerical simulation for five-bar linkage as a vertical dynamic robot. The methods of learning system are shown up for the iterative precision of each link at each time step in repetition domain. Those can be helped to apply to the vertical multiple dynamic systems for precision quality assurance in the industrial robots and medical equipments.

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APPLICATIONS OF INTEGRATED SAFETY ANALYSIS METHODOLOGY TO RELOAD SAFETY EVALUATION

  • Jang, Chan-Su;Um, Kil-Sup
    • Nuclear Engineering and Technology
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    • v.43 no.2
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    • pp.187-194
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    • 2011
  • Korea Nuclear Fuel is developing the X-GEN fuel which shows high performance and robust reliability for the worldwide supply. However, the simplified code systems such as CESEC-III which were developed in 1970s are still used in the current Non-LOCA safety analysis of OPR1000 and APR1400 plants. Therefore, it is essential to secure an advanced safety analysis methodology to make the best use of the merits of X-GEN fuel. To accomplish this purpose, the $\b{i}$ntegrated $\b{s}$afety $\b{a}$nalysis $\b{m}$ethodology (iSAM), is developed by selecting the best-estimate thermal-hydraulic code RETRAN. iSAM possesses remarkable advantages, such as generality, integrity, and designer-friendly features. That is, iSAM can be applied to both OPR1000 and APR1400 plants and uses only one computer code, RETRAN, in the whole scope of the non-LOCA safety analyses. Also the iSAM adopts the unique and automatic initialization and run tool, $\b{a}$utomatic $\b{s}$teady-$\b{s}$tate $\b{i}$nitialization and $\b{s}$afety analysis too l (ASSIST), to enable unhandy designers to use the new design code RETRAN without difficulty. In this paper, a brief overview of the iSAM is given, and the results of applying the iSAM to typical non-LOCA transients being checked during the reload design are reported. The typical non-LOCA transients selected are the single control element assembly withdrawal (SCEAW) accident, the asymmetric steam generator transients (ASGT), the locked rotor (LR) accident, and bank CEA withdrawal (BCEAW) event. Comparison to current licensing results shows a close resemblance; thus, it reveals that the iSAM can be applied to the non-LOCA safety analysis of OPR1000 and APR1400 plants.

An Empirical Study on the Effects of Learning Competences and Dynamic Capabilities of Korean Small-sized Enterprises for Export-oriented to the Competitive Advantages (한국수출중소기업의 학습역량과 역동적 역량이 해외시장 경쟁우위에 미치는 영향에 관한 실증연구)

  • Huh, Young Ho;Cho, Yeon Sung
    • International Area Studies Review
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    • v.14 no.3
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    • pp.388-419
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    • 2010
  • The aim of the study is to create a theoretical model and hypotheses on competitive advantages of exporting SMEs. For this we have proposed an integrated model in which learning competences and dynamic capabilities should have an influence on competitive advantages of the SMEs. This study have examined the influence of integrating and reconfigurating capability respectively. As a result, the learning competences had positive influences in dynamic capabilities and to the cost and service competitive advantage. To integrating capabilities had positive influences in competitive advantage. Besides, dynamic capabilities playing significant intermediate role only for the cost advantage through the analysis of intermediate effects of learning competence to the dynamic capabilities.

Reformation of the Korea's National Archiving System (한국 국가기록관리체제의 개혁과 국가기록원 개편)

  • Lee, Seung il
    • The Korean Journal of Archival Studies
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    • no.41
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    • pp.39-73
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    • 2014
  • This study aims to analyze the features and problems of the Korea's national records archiving system established in 1999, as well as to suggest the countermeasures. First, in Korea, permanent records are archived by the administration, legislature and judicature separately. However, around the world there are very few cases where a national archives controls the records of the administration alone, whereupon there is the need to set up an integrated archiving system regarding the records of the administration, legislature and judicature. Second, in Korea, the records archiving system leans too much towards the centrally-controlled system, which is urgent to be solved. 'Record Management Act' stipulates that all the public records, including nonpermanent ones, shall be managed by National Archives, wherewith National Archives is overburdened. Hereat, it may be desirable for National Archives to manage very important records that deserve to be archived permanently and for Record Center to archive other records, which needs to be made into law.