• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2003년도 춘계학술대회
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• pp.214-225
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• 2003

Now a day, the company must strengthen the contact-point of the customer who the company has and has to block the secession of the customer by providing services or goods on time. Under this market situation, the corporation extends the CRM for the customer management and strategic management, and set the CRM-strategies up for managing the customer relationship. For this, the present enterprise's level and the business-ability for the management of the customer relationship should be considered. Therefore, in this study, we will analyze the critical factors to set the CRM up as a strategy by studying the literature review. In the critical factors, the factors of enterprise level as well as the technical factor will be included. Secondly, as you know, the BSC is used to evaluate the corporation as a index. In this study the BSC model is changed and rearranged for the applied BSC model to measure the C3M level of companies. Thirdly, based on the model developed, the factors in the first step are classified by levels and weighted values are calculated by using AHP method. As a result, we will show the diagnostic model for check the operational performance of management, marketing and sales etc.

• 한국산학기술학회논문지
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• 제10권7호
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• pp.1631-1634
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• 2009

SiC에 기초한 도전성 복합체의 최적 설계 요소와 세라믹 제조기법을 찾고 발열체 제작을 위한 기초기반 기술을 확보하였다. 제품 응용시 세라믹 발열체를 하나의 몸체로 제작하여 접촉 저항을 최대한 줄이면 sheath 발열체보다 1.1배 느린 초기 상승 온도 속도를 높일 수 있고, 보온력에서는 SiC계 세라믹 발열체가 sheath 발열체보다 약 2.7배 높기 때문에 제품의 사용 기간이 길어질수록 에너지 절감 효과를 얻을 수 있어, 경제성 면에서 대단히 유리하게 평가 된다.

• 한국운동역학회지
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• 제13권2호
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• pp.175-183
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• 2003

The purpose of this study was to analyze the kinetic energy of putter head and ball movements during the process of impact. Highly skilled 5 golfers(less than 1 handicap) participated in this study and the target distance was 3 m. Movements of ball and putter head were recorded with 2 VHS video cameras(60 Hz, 1/500 s shutter speed). Small control object($18.5{\times}18.5{\times}78.5\;cm$) was used in this sdtuldy. Analyzing the process of impact, putter was digitized before 0.0835 s and after 0.0835 s of impact. Ball was digitized 0.1336 s after impact. The results showed that the maximum speed was appeared at Impact and prolonged for a while. Contact point of the club head was within 0.7 cm to the z axis. After contacting the club head, the ball was moved above the ground level(slide) and returned to the ground with sliding and rolling. After contacting the ground, the speed of ball was relied on the surface of the ground. During impact, 70% of kinetic energy of club head has been transferred to the ball.

• Journal of the Korean Wood Science and Technology
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• 제36권3호
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• pp.61-69
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• 2008

구조부재의 압축성능을 검토하기 위하여 낙엽송 소재에 대해 섬유방향 및 섬유직각방향 압축시험을 행하였다. 시험편의 길이와 가압판의 크기에 따른 압축성능을 검토하였으며 현행 기준의 최소끝면거리의 적정성에 대해 검토하기 위하여 다우얼 지압지점으로부터 시험편의 섬유방향에 대해 변형율 변화를 측정하였다. 가압판의 크기에 따라 압축성능은 다르게 나타났으며, 다우얼형 파스너의 최소끝면거리(end distance)는 내부변형을 고려할 경우 현행 7 D보다 높게 적용하여야 안전한 것으로 나타났다.

• Kyungpook Mathematical Journal
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• 제56권2호
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• pp.583-595
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• 2016

Archimedes showed that for a point P on a parabola X and a chord AB of X parallel to the tangent of X at P, the area S of the region bounded by the parabola X and chord AB is four thirds of the area T of triangle ${\Delta}ABP$. It is well known that the area U formed by three tangents to a parabola is half of the area T of the triangle formed by joining their points of contact. Recently, the first and third authors of the present paper and others proved that among strictly locally convex curves in the plane ${\mathbb{R}}^2$, these two properties are characteristic ones of parabolas. In this article, in order to generalize the above mentioned property $S={\frac{4}{3}}T$ for parabolas we study strictly locally convex curves in the plane ${\mathbb{R}}^2$ satisfying $S={\lambda}T+{\nu}U$, where ${\lambda}$ and ${\nu}$ are some functions on the curves. As a result, we present two conditions which are necessary and sufficient for a strictly locally convex curve in the plane to be an open arc of a parabola.

• 한국정밀공학회지
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• 제3권2호
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• pp.55-61
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• 1986

The study is concerned with the investigation of grinding factor affecting the AE Source by means of the relation between the amplitude level of AE signal and the depth of wheel engagement in surface grinding by AE method. As the result, work velocity was confirmed that the amplitude of AE signal had almost constant value in comparison with the depth of wheel engagement. But the depth of wheel engagement and the width of wheel engagement were proportional to the amplitude of AE signal. Therefore, when the AE Source was classified by 3-zone, Ws and Wf were affected by the depth of wheel engagement and that Wr was affected by the width of wheel engagement. Also, the adaptability of the AE method was studied about the detection of tool life of grinding wheel, sparkout and initial contact point.

• 대한기계학회논문집
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• 제11권2호
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• pp.296-303
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• 1987

본 논문에서는 동력전달용 기어에 주로 쓰이는 물림률 1.3 이상일 때, 치면접 촉응력과 공칭굽힘응력이 작게되는 풀림각 1˚로 고정하여 잇수 30∼100개 압력각 14˚∼30˚의 범위에서 최소 원호반경식과 치형 조건을 만족하는 최대 원호반경식에 대하여 고찰하였다.

• 드라이브 ㆍ 컨트롤
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• 제13권2호
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• pp.26-33
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• 2016

This paper describes of a mathematical and real experimental analysis for a walking robot which uses servo valve driven hydraulic actuator. Recently, many researchers are developing a walking robot based on hydraulic systems for the difficult and dangerous missions such as walking in the rough terrain and carrying a heavy load. In order to design and control a walking robot, the characteristics of the hydraulic actuators in the joint through the view point of walking such as controllability and backdrivability must be analyzed. A general mathematical model was used for analysis and proceeds to position and pressure changes characteristic of the input and backdrivability experiment. The result shows the actuator is a velocity source, had a high impedance, the output stiffness is high in contact with the rigid external force. So stand above the controller and instruments that complement the design characteristics can be seen the need to apply a hydraulic actuator in walking robot.

• Smart Structures and Systems
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• 제24권4호
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• pp.427-434
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• 2019

This study investigates the structural integrity of the amphibious tour bus under the rollover condition. The multi-purpose bus called Dual Mode Tour Bus (DMTB) which explores on land and water has been designed on top of a truck platform. Prior to the fabrication of new upper body and sailing equipment of DMTB, computational analysis investigates the rollover protection of the proposed structure including superstructure, wheels, and axles. The Computer-Aided Design (CAD) of the whole vehicle model is meshed and preprocessed under high performance using the Altair HyperMesh to attain the best mesh model suited for finite element analysis (FEA) on the proposed system. Meanwhile, the numerical model is analyzed by employing LS-DYNA to evaluate the superstructure strength. The numerical model includes detail information about the microstructure and considers wheels and axles as rigid bodies but excludes window glasses, seats, and interior parts. Based on the simulation analysis and proper modifications especially on the rear portion of the bus, the local stiffness significantly increased. The vehicle is rotated to the contact point on the ground based on the mathematical method presented in this study to save computational cost. The results show that the proposed method of rollover analysis is highly significant not only in bus rollover tests but in crashworthiness studies for other application. The critical impartments in our suggested dual-purpose bus accepted and passed "Economic Commission for Europe (ECE) R66".

• 통합자연과학논문집
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• 제6권4호
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• pp.215-219
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• 2013

In this study, in order to investigate how consecutive treatments of glass surface with HF acid and water vapor/Ar plasma affect the quality of 3-aminopropyltriethoxysilane self-assembled monolayer (APS-SAM), poly(3,4-ethylenedioxythiophene) (PEDOT) thin films were vapor phase-polymerized immediately after spin coating of FeCl3 and poly-urethane diol-mixed oxidant solution on the monolayer surfaces prepared at various treatment conditions. For the film characterization, various poweful tools were used, e.g., FE-SEM, an optical microscope, four point probe, and a contact angle analyzer. The characterization revealed that a well prepared APS-SAM on a glass surface treated with water vapor/Ar plasma is very useful for uniform coating of FeCl3 and DUDO mixed oxidant solution, regardless of HF treatment. On the other hand, a bare glass surface without APS-SAM but treated with HF and water vapor/Ar plasma generally led to a very poor oxidant film. As a result, PEDOT films vapor phase-polymerized on APS-SAM surfaces are far superior to those on bare glass surfaces in the quality and electrical characteristics aspects.