• 한국생산제조학회지
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• 제18권3호
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• pp.315-320
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• 2009

The purpose of this study is to predict the roundness of Numerical Control Machining so that helps the operator to choose the right machining conditions to produce a product within the given error limits. Learning of neural network is Backpropagation theory. From this study, the base was set to setup the database to produce precisely machined product by predicting the rate of error in the fabrication facility which does not have the environment to analyze it.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.487-491
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• 2001

In this paper, we developed an automated program for the modeling and manufacturing of three-dimensional roller gear cams. A computer program employing the theory of gearing and coordinate transformation is developed for synthesizing and animating cam mechanisms. Then a module for generation NC program for a five-axis CNC machine to manufacture roller gear cam is established.

• 산업경영시스템학회지
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• 제23권61호
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• pp.13-22
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• 2000

To apply the queueing network theory in evaluating performances of flexible manufacturing systems, it is generally assumed that the processing times are distributed exponentially. However, in FMS, processing times are usually deterministic. In this study the performance measures of FMS are approximated under the assumption that processing times are usually deterministic. Multi-classes of parts and single server and multi-server stations are considered in the model. This study also that, in the numerical example, this approach yields better solutions than those obtained by the pure Linearizer algorithm, when the processing times are deterministic.

• 한국생산제조학회지
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• 제7권5호
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• pp.113-119
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• 1998

Air spring has the advantages to be nearly constant in natural frequency inspite of load change, and to be able to control height level. Half-long taper spring has the advantages to function as well link as spring. Thus to utilize two type spring's advantages, half-long taper spring and air spring are combined and used. In this study, the theory to calculate the characteristics in combination is developed.

• 한국생산제조학회지
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• 제5권4호
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• pp.108-120
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• 1996

A new technique and theory are proposed which correct orientation of a cylinder to perform a reliable measurement of the surface profile. We analyze characteristics of machined surfaces, e.g., ground, lapped and turned surfaces. Based upon the results. the optimum correction technique is derived by the statistical method. To verify the techinques, measurements are carried out by using the contact stylus profilometer on a controllable table. The measurement shows that surface information of cylinders can be acquired with high accuracy.

• 재무관리연구
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• 제25권3호
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• pp.1-32
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• 2008

본 연구에서는 $1999{\sim}2004$년 기간중 14,016개의 한국제조기업 표본(패널자료)을 이용하여 현금 비율의 변화와 그 결정요인을 분석하였다. 주요 분석결과는 다음과 같다. 첫째, 기간중 평균 현금 비율은 1999년 말의 4.7%로부터 2004년 말의 5.2%로 상승하였으며, 1개사당 평균 현금보유액도 1999년말의 43억 원에서 2004년 말에는 80억 원으로 2배 정도 상승하였다. 전체 현금보유액중 51대 기업집단이 차지하는 비중은 1999년의 47.6%에서 2004년에는 58.6%로 상승하여 재벌기업의 현금보유 집중도가 최근 들어 더욱 강화되는 것으로 나타났다. 현금비율 및 현금흐름 대비 자본지출의 비율은 전기에는 120.8% 및 56.4%에 달하였으나 후기에는 86.5% 및 48.8%로 각각 하락함으로써 현금보유 수준이나 현금흐름에 비하여 시설투자가 위축되고 있는 것으로 나타났다. 둘째, 현금보유에 관한 목표조정모형과 순위모형을 검증하기 위한 회귀식을 추정한 결과, 목표현금비율 괴리도의 회귀계수 부호는 예상대로 음(-)으로 높은 유의수준을 나타냈으나, 자금부족 변수의 회귀계수 부호는 순위모형의 예상과는 다르게 양(+)으로 나타났다. 셋째, 현금비율을 종속변수로 하고 기업특성변수를 설명변수로 한 회귀모형을 추정한 결과 유형자산규모, 투자기회, 현금흐름의 변동성, 부채비율, 재벌기업더미, 상장기업더미 등은 절충이론에 따른 유의적인 설명력을 보였고, 현금흐름, 투자지출, 자본지출, 순부채발행, 순주식발행, 상장기업더미 등은 순위이론에 따른 유의적인 설명력을 보였다. 결정계수나 F-statistic 등의 통계량으로 미루어 볼 때 절충이론에서 제시된 변수들이 현금비율의 변동을 더 잘 설명하는 것으로 나타났다. 결론적으로 이 기간중 한국제조기업의 현금비율의 변동을 설명함에 있어 순위이론보다는 절충이론이 더 적합한 것으로 판단되고 있다.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2001년도 추계학술대회 논문집
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• pp.275-278
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• 2001

TOC(Theory of Constraints) - the emphasis of this philosophy was on identifying and eliminating constraints(bottle-necks) in the system. TOC solves this and optimizes whole system by improving manufacturing constraints that limit system result. In this paper, it is shown that the concept of the "delayed differentiation" can be applied for enhancing the efficiency of the time buffer and thus reducing the of the time buffer.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1995년도 추계학술대회논문집
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• pp.95-101
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• 1995

The present investigation is concerned with the application of theory on fracture to the prediction of workability of materials in rotary forging, with special reference to center crack. The validity of the theory on ductile fracture was examined by the experimental data. Then the workability of materials in rotary forging was determined.

• Industrial Engineering and Management Systems
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• 제13권3호
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• pp.252-257
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• 2014

Global economic recession, global market reduction, and the deteriorating economic recession are forcing the industry to reconsider the business plan and strategy related to supply chain regardless of the size of the companies. During the economic recession caused by financial anxiety, development of international collaborative producer is the key theme for a manufacturing industry to get over the situation. Especially, development of high-skilled people who are capable of handling global manufacturing management is the key factor in China which shifted from a world factory to a world market. In this background, we started the international project of global manufacturing education and training for Chinese company managers from 2009. In this paper, based on the research conducted by the universities and companies in China, a design of global manufacturing education and training is proposed. This presented design is based on the theory of Japanese production strategy and investigation of actual conditions for Chinese companies and the research methodology of business management practice with efficiency and productive for international level management organization. The effectiveness of the education design is evaluated by applying the international education and training project of Aoyama Gakuin Human Innovation Consulting Inc. and Vigor Management Technology Association.

• 한국IT서비스학회지
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• 제14권3호
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• pp.147-161
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• 2015

The rapid changes in consumption patterns and the manufacturing industry environment are both a threat and an opportunity for small and medium-sized enterprises in Korea because it lacks innovative capacity compared to large conglomerates. In this new manufacturing environment, social manufacturing is an innovative business model that can create new business opportunities for these companies. However, there are not that many proven models of platforms where products are created jointly with consumers. Some conceptual analysis of the success factors and operation strategy of co-creation platforms have started to be released but there are almost no empirical studies conducted on this matter today. In this study, the social manufacturing platform business concept and its components were studied; various factors that affect the willingness to participate in consumer-led co-creation platforms were considered; the factors were surveyed on potential consumers; a study was carried out to analyze the relationship of these factors; a model of these factors were set up and proven.