• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.171-174
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• 1997

The great development of semiconductor industry demands the high efficiency and performance of related device, but the pick and place system of semiconductor packaging device can load a few units until nowdays. Although the system can load a lot of units, it can work multiple sort operation. The defect like that causes a low efficiency. Therefore, this paper represents the development of pick and place system which can work multiple sort operation.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 춘계학술발표대회 논문집
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• pp.342-347
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• 2008

A Microsoft $Access^{(R)}$ application that estimates hourly building energy load is developed based on statistical field measurements. Hourly patterns of heating, hot water, cooling, and electricity loads are evaluated for an energy consuming community composed of various types of buildings. Popular building types such as apartments, offices, hotels and accomodations, stores, churches, schools and educational institutes are included in the model. For each type of buildings, hourly patterns for a month are measured and compiled to derive a 24-hour load distributions. Daily sum of heating, hot water, cooling, and electricity loads are also measured for the building types. The annual energy need profiles are generated by combining the 24-hour distribution and 365-day consumption patterns. The annual maximum values of the 8760 hours of a year for each load type serves as a guide for selecting a device capacity. A user-friendly interface that ushers users throughout the whole process is provided.

• 한국지반공학회논문집
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• 제27권3호
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• pp.5-17
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• 2011

실내시험의 경우 샘플링으로 인한 시료의 교란은 종종 지반의 공학적 특성을 추정하는데 상당한 오차를 발생시키기 때문에 현장지반의 거동을 분석하는데 있어 부적절한 결과를 초래한다. 따라서 본 연구에서는 원위치시험법 중 하나인 스크류재하시험을 개발하였다. 그 이유는 신뢰성 있는 공학적 파라메터를 산정하기 위해서는 원위치시험법을 채택하는 것이 유리하기 때문이다. 스크류재하시험은 나선형의 오거 재하판을 지반 속에 관입하여 재하시험을 하는 평판 재하시험의 개량된 시험이다. 본 연구를 통해 스크류시험장치에 대한 구조와 특성을 자세히 소개하고 실내시험 결과를 통해 장치에 대한 신뢰성을 검증하였다.

• 한국산학기술학회논문지
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• 제22권3호
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• pp.252-260
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• 2021

노쇠의 관리를 위해 근력운동의 중요성이 강조되고 있고 다양한 운동기구들이 개발되어지고 있다. 최근에는 전자기 저항을 디지털 중량으로 변환하여 제어하는 디지털 중량제어기술이 주목을 받고 있으나 국내에서 고령자를 대상으로 하여 디지털 중량제어기술 기반 운동기구의 효과성과 안전성을 검증한 보고는 전무하다, 따라서, 본 연구는 디지털 중량제어기술을 활용한 고령친화운동기구의 인간공학적 분석을 통하여 이후 개발방향의 지표 제시를 목적으로 하였다. 총 20명의 성인 남녀 (연령: 62.40 ± 2.09 세) 를 대상으로 적용 가능한 운동강도를 분류하기 위하여 운동기구의 부하를 레벨화하였고, 세가지 실험대상 동작시의 근 활성도와 심박수를 측정하였다. 또한, 국제 표준 ISO 9241-11에 준거한 설문지를 활용하여 소프트웨어부와 기기부의 안정성, 조작성, 효율성, 만족도 등을 평가하였다. 그 결과, 운동 부하, 근활성도, 심박수가 일관되게 증가하는 결과를 통해서 현장에서 적용 가능한 3단계의 운동 강도를 분류할 수 있었다. 모니터 사이즈의 확대, 메뉴의 한글화, 기구의 소형화, 소음의 최소화가 필요한 것으로 나타났다. 이러한, 결과들을 고려할 때 향후 신제품 개발시에는 기구 크기, 표시부, 소음의 보완을 통한 고도화된 고령친화운동기구 개발의 필요성이 시사 되어 진다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 A
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• pp.325-327
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• 1999

In this research, selection of component load and measurement device is considered for accurate component load modeling. The procedure of component load characteristic experiments is also presented.

• 조명전기설비학회논문지
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• 제27권6호
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• pp.75-81
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• 2013

In this paper, protection coordination between residual current devices and surge protective devices in low-voltage consumer's distribution systems are presented. In the case that a surge protrctive device(SPD) is located on the load side of an residual current device(RCD), when the surge is injected from the source side of the RCD, most of injected surge currents are split into the RCD and the protection coordination between the SPD and RCD is improper, three of 6 specimens experience unintended operation due to test impulse currents. Also when the surges is injected from the load side, a lot of the surge currents is split into the SPD, but a half of test specimens causes nuisance trip. Coordination between SPD and RCD is not valid. When installing SPD, it is important to select SPD after due consideration of the protection voltage level of metal oxide varistor embedded in RCD. It is expected that the results obtained from this work could be useful to improve the protection effects of SPD in low-voltage distribution systems.

• 대한화장품학회:학술대회논문집
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• 대한화장품학회 2003년도 IFSCC Conference Proceeding Book I
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• pp.1-12
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• 2003

Instead of sensory evaluation, we designed an evaluation method of the setting function of hairstyling products, based on an original theory focusing on changes in bending stress observed when a load with continuous bending is applied to human hair. Specifically, we developed a device to measure bending stress to quickly and objectively evaluate the condition of human hair, particularly its dynamic properties such as the setting function, following the application of hairstyling products. This device generates a load with continuous bending while applying a pendulum motion to a hair tress, one end of which is anchored. The setting function and holding power of resins of various molecular weight and ionic properties were evaluated using this device. The results demonstrated a close correlation with those obtained by experts' sensory evaluation. The evaluation results of bending stress and holding rate confirmed that the combined use of two different resins could improve the function of setting preparations. Evaluation using this device was able to substitute for sensory evaluation, and offers quick objective evaluation and detection of changes in the holding power of hairstyling products over time. We conclude that evaluation using this device is a promising new method.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2011년도 후기공동학술대회 논문집
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• pp.97-98
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• 2011

This paper is about the study of a new exo-skeleton device applying a gravity compensator. The exo-skeleton devices is to reduce the external torque applied to the human body joint for the purpose of helping the disabled, reducing heavy payload for industry workers or military soldiers. Most of the exoskeleton devices are actuated by the motors, but motors are limited in energy such that a short durability is always a big problem. In this paper, an exoskeleton device using a new gravity compensator based on a torsion bar is proposed to reduce the torque load applied to human body joints. The exoskeleton device is designed for the lower body of human. Analyses on the torsion bar spring and link of the exoskeleton device using FEM method were performed. To reduce the applied torque to the human joint, a torsion bar gravity compensator is applied to the exoskeleton. The effect of the torsion bar compensator for the exoskeleton device was verified through load test using developed test equipment.

• 한국전기전자재료학회논문지
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• 제34권4호
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• pp.242-245
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• 2021

In this work, we fabricated oxide on an n-type silicon substrate through local anodic oxidation (LAO) using atomic force microscopy (AFM). The resulting oxide thickness was measured and its correlation with load force, scan speed and applied voltage was analyzed. The surface oxide layer was stripped using a buffered oxide etch. Ohmic contacts were created by applying silver paste on the silicon substrate back face. LAO was performed at approximately 70% humidity. The oxide thickness increased with increasing the load force, the voltage, and reducing the scan speed. We confirmed that LAO/AFM can be used to create both lateral and, to some extent, vertical shapes and patterns, as previously shown in the literature.

• KIEAE Journal
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• 제16권5호
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• pp.65-71
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• 2016

Purpose : The solar shading device carries out roles in a reduction of the cooling load and an improvement of the thermal comfort of occupants by adjusting incident solar radiation. In addition, The shading device enhances the visual sensation comfort by controlling the optical properties. In order to improve building performance and comfort of occupancy, interests in application of the shading devices are getting increasing. This study investigated the application and effectiveness of the external shading device design using statistical analysis. The outcome of this paper could be utilized for the realization of status quo and for an estimation of effectiveness of the shading device Method : The period of data gathering was between 2003 and 2014 and total 459 cases of practical building project were investigated. Firstly, this study defined qualification of the shading devices; the shading device should have minimum protruding lengths of 150mm to outside and have the function of shading control. This paper investigated application rate of the shading device in real project, regional rate of application, annual change of application, materials and types. Result : The statistical analysis showed that the application rate of shading devices was 25.7% in total 459 building design projects. The application rate in central and southern region was 25.3% and 27.0% respectively. Meanwhile, Jeju region showed 22.2%, which was the lowest rate although this area needs more shading devices. The application number of the shading device was the smallest in 2007, but the rate gradually increased after that. The applications was the largest in 2014 due to growing interest of the shading devices in the building.