• 산업경영시스템학회지
• /
• 제34권3호
• /
• pp.115-122
• /
• 2011

The critical role played by manufacturing performance measurement systems in achieving competitive success is increasingly recognized. Developing an integrated performance measurement model is significant for strategic management. This study consist of several principal steps. Performance criteria from the literature and an questionnaire were utilized prior to building the performance model. The AHP(Analytic Hierarchy Process) is utilized to evaluate the weight of each criterion when generating the performance measurement model for Korea automobile parts manufacturing company. AHP analysis showed clear difference in the priority between 5 criteria and 24 sub-criteria in terms of manufacturing performance of Korean automobile parts manufacturing company. The result of priority evaluation in the 5 criteria of 2nd level was ranked quality, cost, delivery, employee, flexibility. And the critical sub-criteria in the 24 sub-criteria of 3rd level was ranked claim rate, process defect rate, outsourcing parts defect rate, ability to quality management innovation, claim cost, etc.

• 풍력에너지저널
• /
• 제15권2호
• /
• pp.23-36
• /
• 2024

In this study, a health monitoring system was developed for the two most vulnerable parts of a wind tower support structure: the connection between steel towers (L-Flange) and the concrete foundation-steel tower connection. To select assessment parameters for health monitoring, detailed FEM analysis was conducted using the ABAQUS program. Additionally, a testbed was established near the Jeju Woljeongri wind turbine farm to evaluate the applicability of measurement data by installing sensors. Through computational analysis and relevant criteria review, we defined limits for measurement parameters by vulnerable section. We categorized the structural safety evaluation into four stages: normal, caution, warning, and danger, and selected management criteria for each stage. From this, an algorithm to evaluate safety was developed, and a visualized monitoring platform based on the established critical parts monitoring system was developed.

• 한국윤활학회:학술대회논문집
• /
• 한국윤활학회 2003년도 학술대회지
• /
• pp.395-401
• /
• 2003

In this paper, the dent printing phenomena and critical dent size which lead to premature failure of deep grooved ball bearing for automobiles are presented. The results of newly assembled test bearings showed that the ball dent size strongly affect the bearing life and inner ring raceways were the major failed parts in spite of using the dented balls. The dent printing phenomena are a root cause of premature failure, which was not reported until now. And there exist the critical ball dent size for given rolling bearings and operating conditions. So, the initial condition of tribologically mating parts should be treated as important as the failed body itself.

• 한국지역지리학회지
• /
• 제7권2호
• /
• pp.55-70
• /
• 2001

본 연구는 부산 신발산업 노동과정의 공간적 특성을 분석한 것이다. 신발산업의 생산체계는 제품 및 디자인 개발, 부품 및 소재 개발 생산, 완제품 조립 마케팅으로 구성되며, 생산과정별 노동과정의 성격도 상이하다. 전문적인 다기능 인력에 의존하는 제품 및 디자인 개발, 핵심 부품 및 소재 개발 생산, 마케팅 등의 핵심 기능은 자사상표의 제품생산 기업에서만 수행되며, 주로 선진국과 국내의 서울과 부산지역에 입지 한다. 중요 부품 및 소재 개발 생산의 준핵심 기능은 고기능 고숙련의 노동력을 요구하며 전통적인 신발생산지역에서 주로 이루어지고 있다. 또한 숙련 미숙련의 여성노동력에 대한 의존도가 높은 완제품 조립생산과정은 핵심 기능 흑은 준핵심 기능과 함께 이루어지거나 의무화되기도 한다. 공간적으로는 국내의 전통적인 신발생산지역을 중심으로 이루어지고 있으나 최근 후발 개발도상국으로 확대되고 있다. 반면에 남성 노동력에 대한 의존도가 높은 부품 및 소재의 개발 생산의 경우, 핵심 부품 및 소재는 선진국에서, 중요 부픔 및 소재는 부산의 완제품 생산업체나 혁신적인 부품 및 소재 생산업체에서, 그리고 표준화된 부품 및 소재의 생산은 주로 후발 개발도상국에서 이루어지고 있다.

• Journal of Mechanical Science and Technology
• /
• 제17권2호
• /
• pp.239-245
• /
• 2003

Ultra precision diamond cutting is a very efficient manufacturing method for optical parts such as HOE, Fresnel lenses, diffraction lenses, and others. During micro cutting, the rake angle is likely to become negative because the tool edge radius is considerably large compared to the sub-micrometer-order depth of cut. Depending on the ratio of the tool edge radius to the depth of cut, different micro-cutting mechanism modes appear. Therefore, the tool edge sharpness is the most important factor which affects the qualities of machined parts. That is why diamond, especially monocrystal diamond which has the sharpest edge among all other materials, is widely used in micro-cutting. The majar issue is regarding the minimum (critical) depth of cut needed to obtain continuous chips during the cutting process. In this paper, the micro machinability near the critical depth of cut is investigated in micro grooving with a diamond tool. The experimental results show the characteristics of micro-cutting in terms of cutting force ratio (Fx/Fy), chip shape, surface roughness, and surface hardening nea. the critical depth of cut.

• Journal of Advanced Marine Engineering and Technology
• /
• 제12권3호
• /
• pp.57-67
• /
• 1988

Although handicapped by the inability to bridge the size gap between small laboratory sample and large engineering component, the V charpy test sample method does possess certain advantages, such as each of preparation, simplicity of test method, speed, low cost in test machinery, and low cost per test. On the other hand, the COD test method does posses advantages, which reduce the size gap between the laboratory sample and actual engineering component. Consequently, the correlation between V charpy absorbed energy and the critical COD value is required for estimating critical COD value from the simple V charpy test results. In this paper, the high tensile strength steel AH36 plate specimens having a single edge cracked notch were investigated to find out the correlation between V charpy absorbed energy and critical COD value in the welded parts under such various welding methods as shielded metal arc welding, the submerged arc welding and the electro gas welding by means of V charpy impact test and static 3-point bending test. Main results obtained are as follow ; 1. The relationships between V charpy absorbed energy Wc' and critical COD value ($\delta_c$)show; $\delta_c$=0.0065 Wc'+0.1906. 2. Ductile- brittle transition behaviours can be estimated by means of fracture appearance and general yielding behaviours. 3. The V charpy absorbed energy of SMAW is higher than that of SAW, EGW and similar relationships are obtained in the COD tests.

• 대한임베디드공학회논문지
• /
• 제13권4호
• /
• pp.205-214
• /
• 2018

The reliability test is a crucial step for ensuring robustness of high-cost and complex weapon systems. In this paper, we present a set of quantitative criteria to select critical parts or components in weapon systems for the reliability test, and implement a fuzzy inference system by applying developed criteria to fuzzy theory. We classify the selection criteria of critical parts or components into four fuzzy sets and membership functions. A fuzzy inference rule is proposed based on the AHP (Analytic Hierarchy Process) analysis technique so as to derive a convincing reliability test. The credibility of the fuzzy inference system is confirmed through a case study using actual equipment data exacted from an existent weapon system.

• 경영정보학연구
• /
• 제7권2호
• /
• pp.195-211
• /
• 2005

본 연구의 목적은 우수 중소자동차부품업체의 정보화 사례를 통해 그들의 경험을 공유하고, 중소기업이 정보화를 추진할 때 활용할 수 있는 주요성공요인을 밝혀내어 자사의 정보화 수준을 스스로 평가할 수 있도록 가이드라인을 제공하는데 있다. 이를 위해 업무프로세스 영역별 정보화 성숙도 지표 및 정보화 성공요인에 관한 기존 연구 분석을 하였고 2002년도와 2003년도 중소기업정보화경영원에서 수행한 정보화 우수기업 발굴사업에서 선정된 7개의 정보화 우수 자동차 부품업체들을 대상으로 업무프로세스 영역별 정보화 성숙도 측정과 성공요인의 중요도를 평가하는 사례연구를 수행하였다. 6개 업무프로세스 영역별(개발, 생산계획, 구매, 생산, 주문처리 및 지원 프로세스)로 5단계의 정보화 성숙도 지표를 제시하여 자동차부품 업종에서 발굴된 정보화 우수 중소기업에 적용, 분석하여 시사점을 도출하였다. 본 연구의 결과는 향후 정보시스템을 도입하려는 기업에게 적용 될 수 있을 것이다.

• 자원환경지질
• /
• 제56권2호
• /
• pp.155-166
• /
• 2023

COVID-19를 겪으면서 광물자원의 공급망 관리 중요성이 극대화되었다. 특히 수요 및 공급 관리가 어려운 광물자원은 우리나라가 적극적으로 추진하고 있는 소재부품산업의 원료확보 차원에서 공급망 관리가 중요하다. 본 연구에서는 광종별로 글로벌 공급위험과 공급위험 발생시 국내 경제적 영향의 유·무형 요인을 정량화하고 위험상태 행렬(criticality matrix-criticality level)을 이용하는 핵심광물을 선정하는 체계를 수립하고 평가를 수행하였다. 독과점성, 생산국가 불안정성, 사회환경정책 규제성, 수입 불안정성, 리스크 대응력, 시장규모, 시장 확장성, 경제적 중요성 등을 평가항목으로 하였다. 국내 신성장 사업에 활용되는 40여종의 광물을 평가하여 15종(Li, Pt, Co, V, REE, Mg, Mo, Cr, Ti, W, C, Ni, Al, Mn, Si)을 핵심광물로 선정하였다. 해당 결과는 자원안보 강화를 위한 정책 수립과 기업의 원료 포트폴리오 구성을 위한 의사결정 등에 활용될 수 있을 것으로 기대한다.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2006년도 추계학술대회논문집
• /
• pp.709-711
• /
• 2006

According as optical storage becomes high-density, numerical aperture increases. Therefore, the shift characteristic of moving parts in an actuator for optical pickup becomes a critical design factor because of decrease in the tilt margin. The tilt angle is maximized when the position of moving parts is in a diagonal direction within a moving range. This is determined by design of structure and magnetic circuit of an actuator. Previous analysis method only predicts linear characteristics of moving parts. However, the result of shift characteristics of the moving parts considering structural and magnetic circuit's nonlinearity following the every position simultaneously shows us more realistic result. Therefore, we present analysis method considering nonlinearity of moving parts' position through FEM package using coupled-field analysis. Then, we will suggest hereafter a design guide by comparing the above results with experimental ones.