• 대한전자공학회논문지
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• 제14권3호
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• pp.1-5
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• 1977

압축성 plasma내에서 sheath로 둘러쌓인 원주형도체에 의한 전자파의 산란에 관하여 해석적인 방법으로 조사하였다. 전자파가 입사하는 경우에 대하여 total scattering cross section과 back scattering cross section을 구하였으며 computer로 계산한 수치결과를 graph로 제시하였다.

• 대한설비공학회지:설비저널
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• 제7권3호
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• pp.160-166
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• 1978

온돌 난방계통에서 지면을 통한 열손실을 수학적으로 등각사상과 변수변환방법을 사용하여 해석하였다. 2차원 및 3차원 해석 결과를 얻었다. 난방되는 주택은 직사각형이라고 가정하였다. 그림 2를 사용하여 평균 지면 열손실을 구할 수 있다. 열 특성치가 열 손실에 미치는 효과에 대하여 설명되었다. 열손실을 구하는 수치적 보기를 주었다.

• 대한설비공학회지:설비저널
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• 제14권2호
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• pp.125-137
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• 1985

Standard weather data for Seoul has been developed for use in computer calculations for energy requirements, and the 8760 sequential hourly values for seven weather elements have been placed in magnetic tape and cards. Applying the method determining average month, developed by Japanese Society of Heating, Air-Conditioning and Sanitary Engineers, the standard year data have been selected from the monthly average values for three weather elements during the 10year period of 1971 through 1980. The followings are obtained. 1. The Test Reference Year, consisting of 12 months chosen from different calendar years, has been determined, and TRY tape which contains seven weather elements has been prepared. 2. The Typical Weather Year, which means a year close to the average value, is the year of 1978 during the above 10 year period. 3. During the period, Winter Season needs the maximum heating load is from Dec. 1976 to Mar. 1977 and Summer Season needs the maximum cool ins load is from Jun. to Sep, 1978.

• 대한설비공학회지:설비저널
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• 제11권2호
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• pp.1-9
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• 1982

Friction losses and heat transfer characteristics were studied experimentally for fully developed tubulent flow in tubes with twisted tape swirl generators. Data were obtained for pitch- to-diameter ratios from 8.10 to 25.71 with water under forced convection cool ins conditions. The experimental results of this and that of previous swirl flow investigation by Smithberg and Landis were compared. Nusselt number and friction data are combined in a constant pumping power comparision for swirl and straight flow, which indicates that improvement of 2.0 times in the best performance can be obtained with twisted tape-insert tube. A twisted tape-insert tube is recommended in the case of low temperature difference in heat-exchanger.

• 대한설비공학회지:설비저널
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• 제15권4호
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• pp.356-361
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• 1986

An optimum design condition for a basic refrigeration cycle is defined as the condition which minimizes the total cost of heat exchanges (condenser and evaporator) and compressor for the refrigeration effect. Thermodynamic properties of ammonia (R717) are approximated by rational functions in order to obtain the optimum condition for a basic refrigeration cycle. Optimum condition depends on the heat capacity rates (mass flow rate times specific heat) of cooling water and brine used in condenser and evaporator. The difference between the cooling water temperature and condensation temperature at the optimum condition increases as the heat capacity rates and the coat of heat exchangers relative to the cost of compressor increase. Numerical examples of optimum conditions are obtained when the condensation temperature is $30^{\circ}C$ and the evaporator temperature is $-10^{\circ}C$.

• 대한설비공학회지:설비저널
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• 제14권4호
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• pp.275-284
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• 1985

The thermophysical property values were determined and compared with each other according to the tine of surface treatment. The diffusivity values were obtained by the flash method, and the specific heat values were measured by the differential scanning density. The thermal conductivity values were calculated from the values of the thermal diffusivity, specific heat, and density. The nitrided steels were the structural carbon steels, carbon tool steels, alloy tool steels, and high speed tool steels.

• 미국학
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• 제42권2호
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• pp.31-55
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• 2019

This study explores how the patriarchal system instigates violence through the use of a lottery in "The Lottery" by Shirley Jackson and a reaping in The Hunger Games by Suzanne Collins. To maintain its validity, the patriarchal system makes people internalize the principle of homicide in everyday life. One of the effective ways to sustain the patriarchal system is to develop the gender concept clearly. In "The Lottery," traditional gender segregation results in the construction of a homogeneous community supported by patriarchal concepts. On the other hand, The Hunger Games shows how Katniss Everdeen, the main character, experiences the different gender roles and norms according to the specific surroundings like her hometown (the 12th district), Capitol (the capital of Panem), and finally the Hunger Games stadium, where she has to kill others to survive. In the end, Katniss both becomes a political entity through playing gender performance supported by Judith Butler.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2020년도 학술발표회
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• pp.333-333
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• 2020

미계측 유역의 수문순환이나 수질을 모의하는 것은 매우 어려운 것이 현실이며 특히 장기간에 걸쳐 모의를 해야 하는 경우에는 더욱 그러하다. 본 연구에서는 미계측 유역인 평화의댐 유역을 대상으로 물리적인 과정 기반의 분포형 수문 모형 GSSHA의 장기 유출과 수질 모의에 대한 적용성을 검토하였다. 분포형 유역 모형 GSSHA를 평화의댐 유역에 적용하여 유량과 수질 모의치를 실측치와 비교한 결과 소규모 호우로부터의 첨두유량을 과대하게 모의하거나 실측된 수질 자료와 일부 구간에서 다른 경향성을 보이는 등 일부 불일치하는 사항들이 나타났으나 모의된 주요 호우의 첨두유량과 기저유출의 전반적인 수문곡선 형태는 비교적 양호한 것으로 나타나 실무에서의 적용 가능성이 있는 것으로 판단하였다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 추계학술대회
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• pp.600-601
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• 2021

제5의 전장인 사이버 공간은 전자기 스펙트럼을 이용하여 사이버 공간과 물리 공간 사이에서 다영역 기동에 활용될 수 있다. 이것은 사이버전과 전자전의 특징을 융합하는 사이버전자전의 주요 개념이 된다. 본 연구에서는 OSI 참조 모델을 활용하고, 2계층 데이터링크 계층의 위협 요소를 살펴봄으로써, 사이버전자전 개념을 분석한다.

• 대한설비공학회지:설비저널
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• 제16권6호
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• pp.613-619
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• 1987

In a room air conditioning cooling system, if the room-sensible-heat-factor as plotted on a Psychrometric Chart intersects the saturation curve below the apparatus leaving air dewpoint, reheat must be used to maintain the design room air conditions. However, if the design room humidity is permitted to be raised to some degree, the cooling system will not require reheat as a new room-sensible-heat-factor line is developed between the apparatus leaving air dew-Point and the adjusted design room air conddition point. The advantages to this are the cost of reheat equipment and operation can be avoided. The cycle of this system can be shown on a Psychrometric Chart to plot the design condition points.