• 전기학회논문지P
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• 제65권2호
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• pp.101-107
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• 2016

The main target in this paper is the localization of VME Type EPSM in Generator Exciter(EX2100) System. Developed EPSM has the compatibility with the existing product in the structure and shape and electrical feature and so on, but it has a much improved capacity and reliability in comparison with origin company product. this paper, to improve these functions, put emphasis on protection, monitoring, power capacity increase(over 120%), an enlarged scale of input voltage supply, AC/DC dual voltage use and so on. After manufacturing product localization, it was carried out several tests for the performance and reliability verification of developed product. These tests were performed in Authorized Inspection Agency(KTL) and field application test and maker self-test were additionally performed. Finally, the results of all tests were "success".

• 디자인학연구
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• 제18권2호
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• pp.155-164
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• 2005

홈서비스로봇은 지능적으로 인간과 상호작용하고 스마트하게 서비스를 제공하기 위해 주변 환경에 대한 충분한 공간정보를 파악하고 있어야 한다. 따라서 인간과 로봇이 공조하여 맵빌딩을 수행할 경우 보다 효율적으로 태스크를 수행하기 위한 상호작용 방식에 대해 연구할 필요가 있다. 본 연구는 우선 청소용 로봇의 맵빌딩 태스크를 분석하여 맵빌딩수순(태스크우선/방우선), 표시창 설치(본체/본체+리모컨), 로봇 유도방식(푸쉬방식/풀방식), 피드백 제시양식 (GUI/GUI+TTS)등 4 가지 디자인 요인을 추출하고 그에 대한 잠정적 해결안을 제시하였다. 디자인 요인과 잠정적 해결안을 실험 변인과 수준으로 정의하고 맵빌딩 태스크의 수행도와 행태에 어떠한 영향을 미치는지를 파악하였다. 이를 위해 총 8종류의 실험용 프로토타입을 제작하고 16명의 가정주부를 대상으로 사용성 평가를 실시하여 실증적인 데이터를 수집하였다. 실험결과 맵빌딩 수순이라는 측면에서는 예상과 같이 태스크우선 방식보다는 방우선 방식에서 우수한 태스크 수행도를 보였다. 표시창 설치라는 디자인 요인에 대해서는 리모컨에 표시창이 부착되어 있는 경우 높은 작업수행도와 주관적 만족도를 나타냈다. 로봇 유도방식 측면에서는 예상과는 달리 풀방식과 푸쉬방식 사이에서 태스크 수행도에 큰 차이를 발견할수 없었고 오히려 푸쉬방식에 대한 높은 주관적 만족도를 나타냈다. 피드백 제시양식에 대한 분석결과에서도 예상과 달리 TTS에 의한 부가적인 조작지침 제시는 부정적 이라는 사실을 발견하였다. 맵빌딩을 통해 환경정보를 취득하기 이전 청소용 로봇의 자율성은 초보적인 상태이기 때문에 사용자는 단지 이동성이 있는 가전제품과 상호작용하고 있다고 볼 수 있다. 따라서 총체적으로 보아 전통적인 가전제품을 조작할 때 사용되는 리모컨기반 상호작용방식을 청소용 로봇의 빌빌딩 과정에서도 선호하는 것으로 보인다.

• 산업경영시스템학회지
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• 제28권3호
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• pp.75-86
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• 2005

To investigate the fatigue characteristic of upper limbs, this study analyzed RMS(root mean square) and MPF(mean power frequency) value between initial and terminal stages of each experiment condition. And the effect of intermittent endurance time was evaluated using the Borg's CR10 value that was measured for the parts of upper limb. According to the results of ANOVA on RMS value, there were significant difference on the %MVC about push, pull, and down force exertion. Particularly the ANOVA of up force exertion was significant difference on shoulder flexion, elbow flexion and rest time as well as %MVC. The results of ANOVA for MPF value were significant difference on the %MVC in regard of the push and up force exertion. In case of up force exertion, MPF value tended to shift low frequency at all of the experiment conditions. According to the analysis of duty cycle, RMS value considerably increased over 50% duty cycle and as the %MVC increased, the duty cycle affected the increase of RMS value. MPF value for up and down force exertion decreased at 33%, 50% and 67% duty cycle for all of %MVC. Borg CR10 value of hand and forearm were below the 3-point to the 40% of endurance time at 30%MVC and to the 20% of endurance time at 50%MVC with the exception of up force exertion. But Borg CR10 values of upper arm and shoulder at up force exertion were more than 3-point to the 20% of endurance time at 30%MVC and in the start point of endurance time at 50%MVC.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.226-228
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• 2006

This paper presents the two lossless auxiliary inducors-assisted voltage source type half bridge(single ended push pull:SEPP) series resonant high frequency inverter for induction heated fixing roller in copy and printing machines. The simple high-frequency inverter treated here can completely achieve stable zero current soft switching (ZCS) commutation forwide its output power regulation ranges and load variations under constant high frequency pulse density modulation (PDM) scheme. Its transient and steady state operatprinciple is originally described and discussed for a constant high-frequency PDM control strategy under a stable ZCS operation commutation, together with its output effective power regulation charactertics-based on the high frequency PDM strategy. The experimenoperating performances of this voltage source SEPP ZCS-PDM series resonant high frequency inverter using IGBTs are illustrated as compared with computer simulation results and experimenones. Its power losses analysis and actual efficiency are evaluated and discussed on the basis of simulation and experimental results. The feasible effectiveness of this high frequency inverter appliimplemented here is proved from the practical point of view.

• 전기학회논문지P
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• 제66권4호
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• pp.236-241
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• 2017

This paper presents a single-phase grid connected voltage-ed inverter with a power decoupling circuit. In the single-phase grid connected voltage-ed inverter, it is well known that a power pulsation with twice the grid frequency is contained in the input power. In a conventional voltage type inverter, electrolytic capacitors with large capacitance have been used in order to smooth the DC voltage. However, lifetime of those capacitors is shortened by the power pulsation with twice grid frequency. The authors have been studied a active power decoupling(APD) method that reduce the pulsating power on the input DC bus line, this enables to transfer the ripple energy appeared on the input DC capacitors into the energy in a small film capacitor on the additional circuit. Hence, extension of the lifetime of the inverter can be expected because the small film capacitor substitutes for the large electrolytic capacitors. Finally, simulation and experimental results are discussed.

• 한국산업보건학회지
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• 제3권2호
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• pp.213-226
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• 1993

The purpose of this study is to computerize the design of single source for a duct work system which is essential for the improvement of working places. There are different types of hood, such as general hood, push pull hood and canopy hood. And out of these three types, general hood and canopy hood were used as subjects of this study. The software used here was Quattro Pro 123 programm, and the hardware was IBM PS/SX(type 5510-SK4 S/N 83-05164). And the results are tabulated in