• Journal of the Korean Society of Manufacturing Process Engineers
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• v.6 no.2
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• pp.28-33
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• 2007

This paper describes development of low cost precision machine that has a vacuum chuck. This study mainly aims to find out a cutting condition for maintaining optimum surface condition and to examine cutting characteristics of the precision machine that is equipped by diamond bites. The cutting materials is oxygen free copper. Several experiments were carried out to find out the main factors that affect the surface roughness such as principal axis RPM(rotation per minute), feeding speed, and cutting depth. As a result, we obtain The optimum cutting condition of the developed precision machine.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.8 no.5
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• pp.90-95
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• 1999

Chucking for workpieces is very important for productivity and efficiency in lathe operations. In point of productivity top jaws of the chuck should be changed as quickly as possible in order to reduce idle times wherever workpieces are regripped. A quick change power chuck which can change top jaws quickly by using a jaw change handle without any assembly/disassembly processes of screws is analyzed for this study. strength and stiffness of top jaws by centrifugal force are considered for the design. Structural analysis for the chuck is executed and the finite element method is introduced using MSC/NASTRAN software. Also, the performance of the chuck is evaluated by experiments.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.540-545
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• 2002

The tight integration of the part design and process planning is very effective to high quality product development and cost effective manufacturing. Moreover, the integration in the early design stage, that is, the integration of the conceptual design and the conceptual process planning may take a big impact with the forecasting the alternative of the design and manufacturing. In this paper, the real field parts are studied about the relations among the Feature, Function, and Manufacturing Process taking the style of reverse engineering method, to found the base of the systematic computer system for the integrated product design and manufacturing process planning.

• Journal of the Korean Society for Precision Engineering
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• v.18 no.6
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• pp.148-158
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• 2001

In this paper, Automatic Dynamic Balancer(ADB) was simulated and investigated to use at the high speed rotating chuck for the friction welding. In the limited computer simulations and experiments that have been presently carried out, several conclusions have been found. Above critical speed of the rotating system, ADB can balance the rotating disk. Therefore, it can be predicted that ADB can make an uniform flash during the friction welding.

• The Korean Journal of Applied Statistics
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• v.33 no.4
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• pp.467-482
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• 2020

We investigate a monitoring procedure for the early detection of parameter changes in location-scale time series models. We introduce a detector for monitoring procedure based on modified residual cumulative sum (CUSUM). The asymptotic properties of the monitoring procedure are established under the null and alternative hypotheses. Simulation results and data analysis are also provided for illustration.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.132-139
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• 2005

대한민국 정통부는 IT 산업의 경쟁력 강화를 통한 국가경제발전을 유도하기 위해 8대 서비스, 3대 인프라, 및 9대 신성장동력을 연계하여 시너지효과를 극대화하는 IT 839전략을 마련하여 강력하게 추진 중에 있다. 이러한 상황 하에 향후 IT시장의 선택과 집중을 통한 정책적 육성발전방향을 제시하기 위해서는 9대 신성장동력간 가치사슬에 대한 이해가 최우선 돼야 한다. 본 연구에서는 다차원척도법을 이용하여 IT 신성장 동력 간의 연관성 분석, 시간의 변화에 따른 이동방향 분석, 및 성장동력의 속성을 반영한 PROFIT분석 등을 실시하였다. 본 연구의 결과는 전략적 중요도가 큰 산업 및 분야를 선별 할 수 있을 뿐만 아니라, 효과적인 정책적 투자를 유도하기 위한 전략을 모색할 수 있을 것으로 기대가 된다.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.205-206
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• 2008

한의학에서 손목의 맥파를 손으로 짚어 보고 파형의 변화로써 병변의 원인을 파악하는 것은 기본적인 진단 방법이다. 진단을 위해 요골동맥의 촌, 관, 척 세 부위의 맥파를 수지를 통해 일정 가압을 하며 맥의 깊이, 강약, 빠르기 등을 촉진을 통해 맥상을 분석한다. 본 연구에서는 촌, 관, 척 부위를 동시 측정하기 위해 각 부위에 5개의 압력센서 어레이가 적용된 15채널 맥진기를 구성하였다. 또한 요골 동맥 부위에 적정 가압을 유지하기 위해 공기 커프를 이용한 공압 가압 방식을 적용하였다. 본 가압 방식을 통해 요골 동맥 부위에 연속적이며 정밀 가압제어가 가능하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.35-37
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• 2016

최근 IMO에서는 e-Navigation IT서비스를 사용자 입장에서 평가하도록 인간중심설계(HCD, Human Centered Design) 활동에 기반을 둔 유용성 평가에 대하여 표준화 작업을 진행하고 있다. 만약 IT서비스를 유용성 평가 기법으로 수행한다면 문제점, 오류, 개선사항, 사용자 요구사항 등을 도출할 수 있다. 그러나 IT서비스에 대한 유용성 평가의 관련 연구는 거의 진행되지 않고 있다. 이유는 최근 국제표준 제정을 준비하고 있고 평가를 위한 도구 및 평가 척도, 방법에 대한 기준이 명확하지 않기 때문이다. 따라서 본 연구에서는 경로 계획 공유(Route Plan Exchange) e-Navigation IT서비스에 대하여 유용성 평가 과정을 수행하였다. 유용성 평가를 위해 평가도구, 평가 시나리오, 평가 척도, 평가 방법을 개발하고 항해사 대상으로 유효성(Effectiveness), 효율성(Efficiency), 만족성(Satisfaction)을 평가하였다.

• The Journal of the Korea Contents Association
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• v.14 no.11
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• pp.133-142
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• 2014

The purpose of the present study is to develop and validate the scale measuring consumer empathic response to advertising drama. Through a series of consumer surveys and factor analyses, the Consumer Empathic Response to Advertising Scale (the CERA scale) containing 11-Likert format items was developed. The CERA scale consists of three factors which are empathic understanding, identification, and vicarious emotional response. The CERA scale improves the content validity of the existing consumer empathy scales by including identification factor which has been ignored.

• The Korean Journal of Applied Statistics
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• v.27 no.4
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• pp.619-627
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• 2014

Distances or dissimilarities among units are assumed to be symmetric in most cases of multidimensional scaling(MDS); consequently, it is not an easy task to deal with asymmetric distances. Current asymmetric MDS still face difficulties in the interpretation of results. This study proposes a simpler asymmetric MDS that utilizes the order statistic of an asymmetric matrix. The proposed Web method demonstrates that some influences among objects are visualized by direction, size and shape of arrow to ease the interpretability of users.