• 대한안전경영과학회지
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• 제24권3호
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• pp.93-103
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• 2022

This study investigated the method of continuous improvement of small-medium company production processes through POSCO's QSS(Quick Six Sigma) activities. QSS is a field operation technique that encompasses the advantages of Six Sigma, TPS(Toyota Production System), TQM (Total Quality Management), and IE(Industrial Engineering). Through this, POSCO not only encourages activities centered on related small and medium-sized partners, etc., but is also expected to contribute to the continuous improvement of the company's own production process through QSS activities. In this study, rather than unconditionally carrying out activities according to the needs of large companies, the research is to help the continuous improvement of the actual production process of small and medium-sized enterprises by effectively applying and spreading QSS activities in consideration of the characteristics and environment of the company. For this purpose, empirical research is conducted on the process improvement activities and QSS activities of company Y, which has less than 100 assembly and production quality and inspection processes among SMEs. The changes in the production process improvement of SMEs through the application of the final QSS were investigated through empirical studies.

• 대한안전경영과학회지
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• 제24권4호
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• pp.149-156
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• 2022

Manufacturing process mining performs various data analyzes of performance on event logs that record production. That is, it analyzes the event log data accumulated in the information system and extracts useful information necessary for business execution. Process data analysis by process mining analyzes actual data extracted from manufacturing execution systems (MES) to enable accurate manufacturing process analysis. In order to continuously manage and improve manufacturing and manufacturing processes, there is a need to structure, monitor and analyze the processes, but there is a lack of suitable technology to use. The purpose of this research is to propose a manufacturing process analysis method using process mining and to establish a manufacturing process mining system by analyzing empirical data. In this research, the manufacturing process was analyzed by process mining technology using transaction data extracted from MES. A relationship model of the manufacturing process and equipment was derived, and various performance analyzes were performed on the derived process model from the viewpoint of work, equipment, and time. The results of this analysis are highly effective in shortening process lead times (bottleneck analysis, time analysis), improving productivity (throughput analysis), and reducing costs (equipment analysis).

• 기술혁신연구
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• 제21권1호
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• pp.109-139
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• 2013

본 연구는 미국과 한국의 오픈 소스 소프트웨어(OSS) 기업의 사례를 중심으로 기존 기술추격이론이 지식 집약적인 OSS 산업에서도 적용되는 지를 분석하고 후발기업들이 기술추격의 발판을 마련할 시사점을 연구하는 것을 그 목적으로 한다. 이를 위하여, 국내 SW 기업들의 인터뷰와 미국 SW 기업들의 기록문서 분석 및 2차 출처들의 검토를 통한 실증적 연구를 수행하였으며, 패러다임의 변곡점 판별과 기술체제의 비교라는 분석의 틀을 이용하여 소프트웨어(SW) 기업의 기술추격 과정을 연구하였다. 본 연구결과, OSS 기업의 기술추격을 설명하는데 있어 기존 기술추격이론의 이론적 논거가 유효하지 않다고 판별하였고 기술체제의 비교 결과, 후발기업의 기술추격을 효과적으로 촉진하는 유효한 요소들을 파악하였다. 또한 저자들은 OSS 기업의 사례연구 결과를 통하여 탈 추격이론이 주장하는 기존 이론의 제약을 진단하고 OSS 의 낮은 전유성이 역설적으로 기술추격을 촉진하는 새로운 기술 체제에 대한 해석을 논의한다.

• 한국경제지리학회지
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• 제17권4호
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• pp.801-816
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• 2014

본 연구는 트리플 힐릭스 모형을 활용하여 싱가포르의 첨단생명과학단지에 대한 분석을 시도하였다. 트리플 힐릭스 모형의 이론적 논의와 현실에서의 산 학 관 관계의 차이점에 주목하고 연구문제를 제시하였다. 싱가포르 첨단 생명과학단지는 대학, 정부 그리고 기업체간의 삼자간 상호작용이 존재하고 있었지만, 트리플 힐릭스 모형의 이론적 틀과는 다르게 작동하고 있었다. 우선, 대학보다는 정부가 삼자간의 관계를 결정할 정도의 주도적인 역할을 하고 있었다. 정부는 이민정책, 장학금, 세금감면 및 세금이외의 인센티브 정책 등 생명과학 및 의료산업에 대한 포괄적인 지원 정책을 추진하였다. 또한 정부는 초기단계에서부터 삼자간 관계를 주도하였으며 이러한 역할은 클러스터가 어느 정도 진전된 이후에도 지속되고 있었다. 정부의 이러한 지원은 삼자간 상호작용을 가능하게 하는 추동력으로 작동하고 있었다.

• Fisheries and Aquatic Sciences
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• 제1권2호
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• pp.242-249
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• 1998

The engineering aspect of water treatment processes in the recirculating aquaculture system was studied. To recycle the water in the aquaculture system, a wastewater treatment process was required to maintain high water quality for the growth and health of the cultured fish. In this study, three different biofilm processes were used to reduce the concentration of organic matters and ammonia from the recirculating water - two phase fluidized bed, three phase fluidized bed, and trickling filter. The objectives of this research were to evaluate the optimum treatment conditions of the biofilm processes for the recirculating aquaculture system, and thereby reduce the volume of biofilm processes, which are commonly used for the recycle water treatment processes for aquaculture. The result of this study showed that the removal efficiency of organic matters by trickling filter was found to be lower than that of the fluidized bed. In the trickling filter system, anthracite showed better organic removal efficiency than crushed stone as a media. In the two phase fluidized bed, the maximum removal efficiency of either organics or ammonia was obtained when both the packing rate of media was maintained to $40\%$ of total reactor depth excepting sediment zone and the bed expansion rate was maintained to $100\%$. When 100 tilapia (Oreochromis niloticus) of each average 200g was reared, the pollutant production rate was 0.07g $NH_4\;^+-N/kg$ fish/day and 0.06g P04-3-P/kg fish/day, and sludge production rate was 0.39 g SS/kg fish/day. In the two phase and three phase fluidized bed, the volume of water treatment tank could be calculated from an empirical equation by using the relationship between the influent COD to $NH_4\;^+-N$ ratio (C/N, -), media concentration (Cm, g/L), influent ammonia nitrogen concentration (Ni, mg/L), effluent ammonia nitrogen concentration (Ne, mg/L), bed expansion rate $(E,\;\%)$, and influent flowrate $(Q,\;m^3/hr)$. The empirical equation from this study is $$V_2\;=\;10^{3.1279}\;C/N^{3.5461}\;C_m\;^{-3.7473}\;N_i\;^{4.6477}\;E^{0.0326}\;N_e\;^{-0..8849}\;Q\;(Two\;Phase\;FB) V_3\;=\;10^{11.7507}\;C/N^{-1.2330}\;C_m\;^{-6.5715}\;N_i\;^{1.5091}\;N_e\;^{-1.8489}\;Q (Three\;Phase\;FB)$$

• Bulletin of the Korean Chemical Society
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• 제33권5호
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• pp.1603-1607
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• 2012

The effects of plating process on the surface coverage of the accelerator were investigated in terms of Cu superfilling for device metallization. When a substrate having 500 nm-wide trench patterns on it was immersed in an electrolyte containing poly (ethylene glycol) (PEG)-chloride ion ($Cl^-$)-bis(3-sulfopropyl) disulfide (SPS) additives without applying deposition potential for such a time of about 100s, voids were generated inside of the electrodeposit. In time-evolved electrochemical analyses, it was observed that the process (immersion without applying potential) in the electrolyte led to the build-up of high initial coverage of SPS-Cl on the surface, resulting in the fast saturation of the coverage. Repeated experiments suggested that the fast saturation of SPS-Cl failed in superfilling while a gradual increase in the SPS-Cl coverage through competition with initially adsorbed PEG-Cl enabled it. Consequently, superfilling was achievable only in the case of applying the plating potential as soon as the substrate is dipped in an electrolyte to prevent rapid accumulation of SPS-Cl on the surface.

• 한국과학교육학회지
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• 제31권5호
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• pp.770-787
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• 2011

이 연구는 영재학생들이 작성한 탐구수행일지에서 나타나는 지식생성과정을 분석한 것이다. 분석한 결과, 첫째, 영재학생들은 다양한 지식생성과정을 보여 주었으나, 귀납적 과정과 귀추적 과정이 대부분이었으며, 그 또한 매우 단순한 사고과정만을 보여주었다. 둘째, 영재학생들의 지식 생성 과정은 제한된 범위의 관찰과 경험 상황을 바탕으로 한 단순 반복적인 도식적 문답 과정이 많으며, 단순 반복적인 도식성은 간단한 변인 선택 및 고안, 제한된 범위의 관찰, 주관적 사고로 인한 편견 개입, 탐색이나 결점 찾기 등이 잘 이루어지지 않아 발생하는 것으로 생각되며 이와 더불어 추론의 비약이 자주 나타났다.

• Journal of Information Technology Applications and Management
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• 제15권3호
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• pp.1-25
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• 2008

IT platform migration to open systems (IPMO) bears a great deal of risk over all the associated processes, in terms of a major IT investment. Hence it requires empirical data and references for decision making. Although there have been a number of published papers encouraging or discouraging IPMO, the studies that deliver useful empirical evidence for IPMO decisions are rare. The obvious first step to resolve this problem would be to gain lessons from the organizations who experienced IPMO. Based on the Delphi study, we examine both the pre and post evaluations on IPMO benefits and risks and analyze the underlying reasons of different evaluations from different stages. Our results identify the most important factor the organizations should seriously consider, and which factor is easy to neglect at the ex-ante appraisal stage.

• ETRI Journal
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• 제10권4호
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• pp.146-160
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• 1988

The purpose of the present study is to build a model to determine the structure of long-term quasi-optimal rates of local and toll telephone services. The outline of this study is as follows : Telephone business, providing social goods, is capital-intensive industry which needs huge fixed cost to operate exchanges and telephone networks nationwide. The nature of above industry justifies the market structure of telephone business to be natural monopoly and makes a good reason for government's direct regulation, that is, price regulation. Three is a gap between the present rates and the quasi-optimal ones because some administrative processes intervene in rate making process before execution. On the above diagnostic basis, the present study made an empirical test for the optimality of present rates structure in connection with Ramsey-Boiteux model to maximize the sum of producer's and consumer's surplus and also the current study proposed a qusasi-optimal rates structure for better market performance. From the empirical analysis, we can deduce a policy recommendation the local price should be increased to 47% whereas toll price decreased to 24% in order to improve the net welfare worth of 32.6 billion won.

• 한국전자거래학회지
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• 제6권2호
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• pp.143-157
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• 2001

There has been a need for predicting development efforts and costs of the system during the early stage of the software process and hundreds of metrics have been proposed for computer software, but not all provide practical support to the software engineer. Some demand measurement that is too complex, others are so esoteric that few real-world professionals have any hope of understanding them, and others violate the basic intuitive notions of what high-quality software really is. It is worthwhile that metrics should be tailored to best accommodate specific products and processes after grasping their good and no good point. This paper describes two size estimation techniques, the Karner technique and the Marchesi technique, and compares and analyzes them with proposed evaluation criteria. Both techniques are to estimate software size analyzed by use case that is mainly described during the object-oriented analysis phase. We also present an empirical comparison of them, both are applied in the Internet Medicine Prescription System. We also propose some guidance for experiments based on our analysis. We believe that it should be facilitating project management more effective by adjusting software metrics properly.