• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년도 제31회 추계학술대회논문집
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• pp.411-415
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• 2008

이 논문은 고도모사 시험설비의 전체 사양을 결정에 관계되는 엔진 입구에서의 고도비행 경험을 위한 모의대기 요구 조건, 모의 비행중 쇼요되는 연료 소모량 및 공급 방법, 시험모드별 냉각부하 예측, 효과적인 압력 회복률을 위한 배기 이젝터의 최적형상 결정에 관한 고려사항을 기술하였다. 이를 위하여 엔진의 연료소모량을 고려한 엔진 배기가스의 온도 및 배출량 등의 계산을 수행되었다.

• 설비공학논문집
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• 제20권6호
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• pp.372-380
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• 2008

In order to control indoor air quality and save energy, it is needed to install a suitable ventilation system equipped with heat exchanger for heat recovery. Paper heat exchanger can recover $50{\sim}70%$ of the enthalpy difference between supply and exhaust air. The purpose of this research is to obtain the experimental correlations for the friction factor, heat transfer coefficient, mass transfer coefficient and permeance of paper heat exchanger, which can be used to predict the performance of the paper heat exchanger. Pressure drops at various velocities, and sensible and latent heat transfer rates at various dry-bulb temperatures, relative humidities and specific humidities are measured to derive experimental correlations. The results of prediction using correlations show fairly good agreement with the experimental data obtained in the actual operating conditions.

• 농촌지도와개발
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• 제29권2호
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• pp.51-64
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• 2022

This study aims to investigate relationships between lifestyle and benefit sought of rural healing tourists. For data collection, a total of 3,000 copies of questionnaires were collected by nationwide online survey. The data were analyzed by using SPSS 26.0. The factor analysis identified seven dimensions of the lifestyle : conservative, sports activity orientation, health orientation, consumption orientation, achievement orientation, adventure orientation, and personal orientation. Five dimensions of benefit sought were identified as psychological recovery, outdoor activities, rest, rural experience, and exercise. The results of the canonical correlation analysis indicated that adventure orientation of lifestyle and psychological recovery, outdoor activities, rural experience, exercise of benefit sought were highly correlated. This means it is important to place an emphasis on psychological recovery, outdoor activities, rural experience, and exercise for tourists looking for an adventure away from everyday life. Rural healing tourism marketers should consider lifestyle aspects as the most important factors affecting benefit sought of rural healing tourism.

• 한국지진공학회논문집
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• 제27권6호
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• pp.311-320
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• 2023

When an earthquake occurs, the severity of damage is determined by natural factors such as the magnitude of the earthquake, the epicenter distance, soil properties, and type of the structures in the affected area, as well as the socio-economic factors such as the population, disaster prevention measures, and economic power of the community. This study evaluated the direct economic loss due to building damage and the community's recovery ability. Building damage was estimated using fragility functions due to the design earthquake by the seismic design code. The usage of the building was determined from the information in the building registrar. Direct economic loss was evaluated using the standard unit price and estimated building damage. The standard unit price was obtained from the Korean Real Estate Board. The community's recovery capacity was calculated using nine indicators selected from regional statistical data. After appropriate normalization and factor analysis, the recovery ability score was calculated through relative evaluation with neighboring cities.

• 서비스연구
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• 제9권4호
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• pp.97-114
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• 2019

관여도가 높은 서비스 산업 분야에서 소비자가 지각하는 관계 품질과 서비스 실패의 복구 수준은 서비스 제공자의 이미지와 매출액에 직접적인 영향을 미치는 중요한 요인이다. 특히 성공적인 관계마케팅 전략의 실행과 서비스 실패에 대한 효과적인 복구는 맞춤형 서비스를 기대하는 고객들에게 더욱 많은 만족을 제공하며 기업과 소비자와의 관계를 강화시킨다. 본 연구는 이러한 선행연구들 기반으로, 서비스 실패의 심각성을 관계마케팅과 귀인이론의 관점에서 접근하여 서비스 복구 기대와 구전에 영향을 미치는 변수간의 인과관계를 규명하고자 진행되었다. 실증분석을 위하여 헤어살롱 이용 고객 360명을 대상으로 서비스 실패상황이라는 시나리오를 제시하여 설문조사를 실시한 후에, 불성실한 응답을 제외한 총 333부의 설문지를 최종 분석에 사용하였다. 구조방정식 모형을 이용하여 가설을 검정하였고, 그 결과는 다음과 같다. 첫째, 소비자가 서비스 실패의 심각성을 크게 지각할수록 관계 품질은 나빠진다는 가설이 규명되었다. 둘째, 소비자가 서비스 제공자와 좋은 관계를 유지할수록 서비스 실패의 원인을 일시적이고 통제 불가능한 것이라고 간주한다는 사실도 확인하였다. 셋째, 소비자가 서비스 실패 상황을 일시적인 것으로 지각할수록 서비스 복구에 대한 기대 수준도 높아질 것이라는 가설이 지지되었다. 넷째, 소비자는 서비스 제공자와 관계가 좋을수록 높은 서비스 복구 수준을 기대하며, 동시에 서비스 제공자에 대하여 긍정적인 구전을 할 가능성이 높아진다는 사실이 규명되었다. 본 연구의 이러한 결과는, 서비스 기업의 고객 지향적 비즈니스 모델 개발에 실무적인 도움을 줄 수 있으며 고관여 분야의 서비스 마케팅 연구를 위한 새로운 방향을 제시하였다는 점에서 학문적 의의를 찾을 수 있다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.1511-1516
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• 2007

Because Seaming process of MPJ (Mechanical Press Joining) has various design factors such as thickness, bending radius, seaming width, caulking press width and the dynamic factor such as multistage plastic working, elastic recovery, residual stress, the optimum conditions can't be easily determined. Using a design of experiment based on the FEM, which has several advantages such as less computing, high accuracy performance and usefulness, this study was performed investigating the interaction effect between the various design factor as well as the main effect of the each design factor during drum MPJ and proposed optimum condition using center composition method among response surface derived from regression equation of simulation-based DOE.

• JSTS:Journal of Semiconductor Technology and Science
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• 제8권1호
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• pp.85-91
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• 2008

A Boost Power Factor Correction (PFC) Converter employing Zero Voltage Switching (ZVS) based Compound Active Clamping (CAC) technique is presented in this paper. An Electro Magnetic Interference (EMI) Filer is connected at the line side of the proposed converter to suppress Electro Magnetic Interference. The proposed converter can effectively reduce the losses caused by diode reverse recovery. Both the main switch and the auxiliary switch can achieve soft switching i.e. ZVS under certain condition. The parasitic oscillation caused by the parasitic capacitance of the boost diode is eliminated. The voltage on the main switch, the auxiliary switch and the boost diode are clamped. The principle of operation, design and simulation results are presented here. A prototype of the proposed converter is built and tested for low input voltage i.e. 15V AC supply and the experimental results are obtained. The power factor at the line side of the converter and the converter efficiency are improved using the proposed technique.

• 설비공학논문집
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• 제14권12호
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• pp.1092-1101
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• 2002

The objective of this study is to develop energy saving strategies for indoor swimming pools and to estimate the effect of each energy saving strategy. For this purpose, field measurements regarding pool water heating energy, domestic hot water heating energy are conducted and a base energy consumption model is implemented using the DOE-2.1E program. The results of the study reveal that 25% of the total pool water heating energy may be saved by using night time pool covers, 27% of the total domestic hot water heating energy may be saved by using a waste water heat recovery system (effic. 60%), and of the total ventilation energy may be saved using an exhaust air heat recovery system (effic. 60%).

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.320-321
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• 2011

As the scale of industries expands, the facilities of the industrial customer become larger and more complex. When a fault occurs in the system, the circuit breakers play an important role in minimizing causalitites by quickly tripping the faulted line. Since the capacity of the receiving-end has increased in size, an examination is needed to be performed between the industrial customers and the conventional circuit breakers. The transient recovery voltage, which is the initial transient characteristics of the voltage across the breaker when tripped, is an important factor in determining the circuit breaker's performance. In this paper, a TRV analysis on the large-scale industrial customer is being performed utilizing PSCAD/EMTDC.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 D
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• pp.2197-2198
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• 2006

본 논문은 역률개선 효과가 있는 MERS(Magnetic Enery recovery switch)를 사용하여 에너지 효율에서의 결과를 입증하고자 한다. 전원과 유도성부하에 직렬 연결된 MERS는 Full Bridge와 비슷한 구성으로 전력용 MOSFET(or IGBT) SWITCH 4개와 전해 DC콘덴서 1개로 구성되어진다. MERS의 콘덴서는 부하와 콘덴서의 리액턴스, $X_C<X_L$을 만족하는 콘덴서의 용량을 선택하고 콘덴서에 충전된 전압에 의해 부하의 유도계수를 보상하여 역률을 1로 추종하며 개선된다. 이때 스위치는 전원 전압에 대해 zero-voltage switching 과 zero-current switching을 하게 된다. 만약 부하가 변하더라도 $X_C<X_L$을 만족한다면 자동적으로 역률은 1에 맞추어지게 된다