• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1994년도 추계학술대회 논문집
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• pp.901-906
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• 1994

In designing and evaluating manipulators, itis important to understand the capability of kinematic and static performances. Both workspace and manipulability can be considered as such performance measures. In general, the measure of manipulability is related to the kinematics for serial type manipulators. However.in case of parallel manipulators such as Stewart Platform, the manipulability can be interpreted as the static capability of transforming the input forces of actuators to the wrench of the end-effector. In this paper, the mathematical and physical meanings of manipulability suggested in some research works have been examined, and more meaningful measure of manipulability using the absolute minimum eigenvalues of J $^{T}$ .del. J has been suggested, which has been applied to a Stewart Platform in order to investigate the manipulability of this mechanism..

• 디지털산업정보학회논문지
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• 제5권4호
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• pp.273-293
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• 2009

The purpose of this study is to identify the organizational characteristics that enhance CRM performances of a company dipend on firm's size. Based on a review of diverse definitions of CRM performance, this study examines the relationships among CRM performance measures and organizational characteristics. A questionnaire survey of 140 CRM managers of Korean companies was conducted to test the proposed research model, and a series of structural equation modeling identified the strong effects of organizational characteristics on CRM performance. This study confirmed that firm's size is very important element of CRM performance. And organizational members' resistance to change was found to have no effects on CRM performance.

• Transactions on Electrical and Electronic Materials
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• 제18권3호
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• pp.136-140
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• 2017

The state of charge (SOC) is an important parameter in a battery-management system (BMS), and is very significant for accurately estimating the SOC of a battery. Li-ion batteries boast of excellent performance, and can only remain at their best working state by means of accurate SOC estimation that gives full play to their performances and raises their economic benefits. This paper summarizes some measures taken in SOC estimation, including the discharge experiment method, the ampere-hour integral method, the open circuit voltage method, the Kalman filter method, the neural network method, and electrochemical impedance spectroscopy (EIS. The principles of the various SOC estimation methods are introduced, and their advantages and disadvantages, as well as the working conditions adopted during these methods, are discussed and analyzed.

• 무역상무연구
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• 제34권
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• pp.135-156
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• 2007

Trade Portal Site(TPS) is one of the essential tools which can make it possible for small and medium enterprises(SMEs) to perform international trade activity more efficiently using newest information and communication technology including the Internet. Therefore, Korean SMEs need to utilize TPS more actively to enhance their export competitiveness. In this context, this article analyzes the determinants of export performances of Korean SMEs in utilizing the service of TPS based on the Service Quality Model. As a result of an empirical research by using regressive analysis, various measures of service reliability such as reliability, empathy, and tangibilities have positive effects on SMEs export performance in utilizing TPS. These results provides many useful implications to the TPS managers, e-trade related government agency, along with managers of SMEs using TPS.

• 한국해안해양공학회지
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• 제16권3호
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• pp.171-177
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• 2004

디지털 영상을 이용한 새로운 파고계를 연구ㆍ개발하였으며 실험실의 조파 수조를 사용하여 검증하였다. 본 연구는 비디오 동영상이 1/15초의 일정한 간격으로 영상을 촬영하는 규칙성과 아날로그 영상에서 디지털 영상으로의 변환, 그리고 큰 용량의 저장 매체를 활용하였다. 본 파고계는 수면의 움직임에 따라 동일하게 움직이는 부이를 촬영한 영상에서 그 움직임을 자동으로 추출하는 방법으로 파고 관측을 하였으며 참값과 비교 검증하였다. 차후 개선 연구를 통하여 해안에 근접한 천해역에서 파랑 관측을 하는데 활용할 수 있을 것으로 보인다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.89-90
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• 2006

In this paper, the performances of the IEEE 802.15.4 under the IEEE 802.11b interference are compared under two kinds of channel sensing mechanisms: carrier sense (CS) and energy detection (ED). For each channel sensing mechanism, the average transmission delay, and the throughput are used as performance measures.

• 한국컴퓨터정보학회논문지
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• 제6권4호
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• pp.138-145
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• 2001

본 논문에서는 분산처리시스템에서 서버에 대한 작업의 서비스요구와 서버의 서비스율이 네트워크환경에 따라 모호성을 갖는 경우, 시스템의 성능을 평가할 수 있는 퍼지 폐쇄형 BCMP 큐잉네트워크모델을 제안하였다. 이 모델은 퍼지요소들을 처리할 수 있는 퍼지평균값분석방법을 사용하여 시스템성능을 평가할 수 있는 측도를 유도하였다. 이들의 유효함을 검증하기 위하여 제안한 모델에 작업의 서비스요구와 클라이언트의 수의 변화에 따른 성능평가를 시뮬레이션 하였고, 그 결과를 확인하였다.

• 한국태양에너지학회 논문집
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• 제36권4호
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• pp.1-9
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• 2016

The purpose of this study was to compare heat shading performance of various blind types in summer. 4 types of blinds were employed and the results are summarized as follows: 1) There were significant differences in indoor thermal environment and heat shading performance between different heat shading devices, and functional blinds demonstrated relatively superior heat shading performance. 2) Indoor long wave radiation influx measures were lowest for the coating roll blind (Blind B), followed by the coating venetian blind (Blind C), the venetian blind (Blind A), the roll blind, and not having any blinds at all. 3) Such examination results carry implications to reduce cooling load and enhance the indoor environment.

• 수산경영론집
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• 제9권1호
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• pp.1-27
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• 1978

The paper attempts to analize the economic situations of the coastal fishing business contering on the fishery right fisheries. Fisheries in Korea are usally divided in to three categories according to the distance fishing grounds; namely, coastal fisheries, off -shore fisheries and deep-sea fisheries. The fishery right fisheries fall into the category of the coastal fisheries, and include five typs of fisheries: 1. Class 1 common fishing 2. Class 2 common fishing 3. Class 3 common fishing. 4. Set-net fishing. 5. Aquarculture fishing. These fisheries have been stagnated mainly due to traditional fishing methods, unskilled labor forces, shortage of capital, and lack of the technological improvements. Owing to these factors their profitabilities of the fishing businesses have been steadly lowered. The main purpose of this paper is to point out the measures required in developing the fishery right fisheries. Economic performances were estimated for 1976 with data collected in the late 1977.

• 대한인간공학회지
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• 제25권3호
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• pp.61-66
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• 2006

Awkward work postures in workshop highly affect on work-related musculoskeletal disorders(WMSDs). Especially, in automobiles assembly process, these awkward work postures of workers may cause serious injury and illness. This study is to compare the performance among the evaluation tools which can measure the work-loads caused by the awkward work postures in automobiles assemble process. RULA, REBA and TVAL(Toyota Verification of Assembly Line) are used as the evaluation tools. The 85 jobs selected in the automobiles assembly process are applied to the three tools and their performances are analyzed after the evaluation of the work-load in each job. Through various measures of performance such as statistical test, DUNCAN test, regression test etc., the tendencies and characteristics among them are analyzed in detail.