• 한국지반신소재학회논문집
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• 제11권4호
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• pp.55-62
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• 2012

본 적용성 평가 연구에서는 기초연구에서 제안된 지반굴착시 소요되는 전기에너지와 지반의 표준관입시험 N값에 대한 상관식의 타당성을 검증하기 위하여 전류값과 굴착깊이 계측을 위한 측정센서와 데이터 저장시스템을 개발하였으며, 현장시험시공을 수행하였다. 현장시험시공에서 계측된 전류값과 굴착속도는 상관식을 사용하여 표준관입시험 N값 추정에 이용되었으며, 추정한 표준관입시험 N값은 지반조사로부터 실측된 N값과 비교하였다. 현장시험시공 결과 지반굴착에 소요되는 전기에너지는 표준관입시험 N값을 추정하는 지표로 활용될 수 있으며, 말뚝기초의 선단위치를 결정하는 시공관리 자료로 활용될 수 있음을 확인하였다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.103-108
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• 2008

Automatic control makes the air-handling unit go into operation and determines the functions of high-efficient and energy-saving machines. Yamatake, an automatic control system manufacturer, have expanded fault detection and diagnosis, and data volumes so as to achieve higher technology in control by developing a sensor which makes field data visible, an actuator and Intelligent Conponent. This study, thus, focuses on applications for saving energy with Intelligent Conponent and goes in for easing global warming by creating future field data-based applications.

• 대한기계학회논문집
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• 제19권8호
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• pp.1799-1809
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• 1995

The applicability of the field-consistency paradigm, which was originally employed for analysis of locking due to constrained energy having the second power of a strain, is extended to the constrained energy having a quadratic form of strain. For the extension, nearly-incompressible plane strain problem is considered by introducing the concept of reduced minimization. The field-consistent analysis of the plane strain problem leads to a clear and systematic understanding on the relation amongst constraints imposed on element, spurious constraint -free optimal points, and integration order used.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년 영문 학술대회
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• pp.553-556
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• 2008

A Magneto Plasma Sail(MPS) produces propulsive force by the interaction between the solar wind and an artificial magnetic field inflated by injecting plasma. Using a 2D hybrid PIC code, we evaluate the inflation of magnetic field when Argon(Ar) plasma with different ${\beta}_{in}$ including the value less than one is injected into the dipolar magnetic field generated by a superconducting coil. It is found that the magnetic field can be inflated by injecting plasma within an angle of $30^{\circ}$ in the polar direction and the magnetic field decays in the polar direction according to $B{\propto}r^{-2.4}$ after the plasma(${\beta}_{in}$=0.1) is injected.

• Transactions on Electrical and Electronic Materials
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• 제17권1호
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• pp.50-55
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• 2016

In this paper, we have analyzed the electrical characteristics of 1200V trench gate field stop IGBT and have compared to NPT planar type IGBT and NPT planar field stop IGBT. As a result of analyzing, we obtained superior electrical characteristics of trench gate field stop IGBT than conventional IGBT. To begin with, the breakdown voltage characteristic was showed 1,460 V and on state voltage drop was showed 0.7 V. We obtained 3.5 V threshold voltage, too. To use these results, we have extracted optimal design and process parameter and designed trench gate field stop IGBT. The designed trench gate IGBT will use to inverter of renewable energy and automotive industry.

• 한국태양에너지학회 논문집
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• 제22권4호
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• pp.68-76
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• 2002

This paper discusses thermal and ventilation performance which might be caused by the adoption of one of specific building facade techniques, Double Skin System(DSS). One building with a prototypical DSS was selected and systematically investigated through field monitoring and computer simulation techniques. A network model of ventilation was successfully made using COMIS to evaluate ventilation performance of the system which can hardly be done by field measurements. Various operating conditions of air conditioning on/off and window opening were implemented in this type of building. Through the appropriate operation of the DSS in summer, simulation-based and experimental results implicate that it can lead to cooling energy savings.

• 설비공학논문집
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• 제16권1호
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• pp.54-61
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• 2004

The purpose of this study is to improve of energy performance in school buildings. Many building renovations have mainly focused on commercial buildings and houses, but school buildings have no attention in this field although there are many buildings that show degraded energy performance and there are many old fashioned buildings which need renovation. This study was carried out through the survey, field study, energy simulation and life cycle cost analysis. The results of this study can be summarized as follows: In model building, large amount of heat were lost at the building envelope, such as non-insulated skins, window-sills and window-frame joints. According to the simulation result, about 15％ of heating energy is saved by the insulating works compared to pre-renovation condition. Also, LCC analysis revealed to be more effective to select a exteria wall insulation such as a dryvit system.

• 멤브레인
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• 제27권2호
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• pp.121-128
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• 2017

Mesoscale simulation은 원자의 그룹을 묶어서 하나의 단위로서 계산을 수행하는 전산모사 기술로 $ns{\sim}{\mu}s$의 시간 및 $nm{\sim}{\mu}m$의 크기까지 모사가 가능하다. 이러한, mesoscale simulation에는 (1) 입자 자체의 움직임을 계산하여 시스템을 모사하는 particle-based mesoscale, (2) 입자의 움직임이 아닌 chemical potential filed나 density field 등의 변화를 계산하여 시스템을 모사하는 field theory 등의 방법 등이 있는데, 두 방법 모두 고분자의 거시적 특성을 살펴보기 위한 강력한 전산모사 기술로서, 에너지-환경 분야용 고분자 분리막의 다양한 응용분야에서 활용되고 있다. 기존에는 주로 블록 공중합체 분야에서 연구결과들이 보고되었으나, 최근 들어 실제 고분자 분리막의 제조 조건 등을 모사한 연구 결과와 같이 좀 더 응용 분야에 가까운 다양한 에너지-환경용 고분자 분리막 관련 연구가 진행되고 있다. 이온 교환막의 경우에는 이온 전달 채널 형성을 분석 및 예측하기 위한 다양한 mesoscale simulation 결과들이 발표되고 있고, 최근에는 CNT, graphene 등의 나노 첨가물 소재에 대한 연구도 활발히 진행되고 있다. 본 총설에서는 mesoscale simulation 관련 연구에 대한 동향을 정리하고, 어떤 분야에서 유용하게 활용 가능한지 제시하며, 에너지-환경 분야에 종사하는 분리막 연구자들이 mesoscale simulation 기술에 좀 더 쉽게 다가갈 수 있는 기회를 제공하고자 한다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.1602-1605
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• 2008

We considered most general electron emission caused by temperature as well as electric field with a free electron gas model. The total electron emission current density comes from field emission effect where electron energy is lower than vacuum and from thermionic emission effect where electron energy is higher than vacuum. The total electron emission current density is shown as a function of temperature for constant electric field, and as a function of electric field for constant temperature.

• 한국태양에너지학회 논문집
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• 제28권2호
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• pp.34-41
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• 2008

A low-temperature solar thermal system assisting a biological nitrogen treatment reservoir was designed and field-tested. A large tank whose temperature was maintained at about $25-30^{\circ}C$ to enhance the performance of a biological nitrogen treatment process was heated by an array of flat plate solar collectors. Test results revealed that the overall collector efficiency was above 50% for the most cases tested. This high efficiency was possible owing to the relatively low collector temperature that can be traced back to the reservoir temperature. A substantial enhancement in nitrogen treatment was observed as a result of maintaining the reservoir temperature higher.