• 한국지반신소재학회논문집
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• 제6권1호
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• pp.1-7
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• 2007

연약지반처리를 위해 바로 장비가 진입하기 어려운 경우에, 적절한 강도를 갖는 토목섬유를 부설하고 그 위에 샌드매트층(Sand Mat)을 형성시켜 기초지반의 지지력을 증가시킨다. 이러한 보강메카니즘에 대한 지지력을 평가하는 식을 Yamanouchi(1985)가 제안을 하였다. 우리나라의 경우 주로 Yamanouchi가 제안한 식을 사용하여 설계를 행하고 있다. 그러나, 제안식에서 접지압을 감소시킬 목적으로 접지폭원을 증대시키면 오히려 지지력은 감소하고 소정의 안전율을 얻기 위해서는 성토두께를 증가해야 하는 등 지지력 산정에 있어서 논리적인 모순점을 내포하고 있다. 이러한 논리적인 모순점을 검토하기 위해서 모형토조에 연약지반을 조성하여 지지력실험을 실시하였다. 연약지반자체, 연약지반위에 보강재를 포설했을 때, 포설된 보강재에 인위적으로 인장력을 가했을 경우, 샌드매트층을 포설했을 때, 다른 조건을 일치시키며 단지 재하판의 폭을 달리 했을 때 등으로 나누어 모형재하시험을 행하였다. 실험결과를 다양하게 분석하였으며 특히 Yamanouchi가 제안한 식이 갖는 모순점을 설명하는 새로운 지지력식을 제안하였다.

• 한국전산구조공학회논문집
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• 제21권2호
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• pp.169-187
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• 2008

기존의 하중-기반 방법을 대체할 방법중에 성능-기반 방법이 내진설계 및 내진성능평가의 기법으로서 널리 인식되고 있는 실정이다. 탄성응답스펙트럼을 사용하는 역량스펙트럼방법은 비선형 시스템을 등가의 선형시스템으로 치환하여 주어진 지진 하중에 대한 구조물의 최대 비선형 거동을 예측한다. 본 연구의 목적은 철근콘크리트 벽체구조물에 대하여 4개의 등가단자유도방법과 5개의 등가감쇠방법을 사용하여 역량스펙트럼방법의 정확성을 평가하는 것이다. 역량스펙트럼방법의 정확성을 평가하기 위하여 벽체구조물에 대한 진동대 실험결과와 비교하였다. 또한 이선형 곡선변환방법(등가에너지 근사화방법, 유효강성 사화 방법)에 의한 이선형 역량곡선들의 역량스펙트럼 해석에 대한 영향도 비교하였다.

• 한국화재소방학회논문지
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• 제27권4호
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• pp.13-20
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• 2013

1968년 우리나라 소방법이 제정된 이래 최근에는 건축물이 초고층화 및 초심도 등 환경적으로 급변하고 있다. 이러한 환경적 변화에 따른 소방력의 적절한 대응은 반드시 이루어져야 한다. 그 중에서 소화수원은 소방력의 근원이 되는 매우 중요한 인자이다. 이에 중국, 일본, 미국의 소방법을 통하여 우리나라의 소화수원공급 시간 및 소화수원을 비교하였으며 각 수계소화시스템에 대해 건축물 용도, 면적, 층수 그리고 위험 급별로 소화수 유량(flow rate), 소화수 공급시간, 소화수원량 등을 비교하였다. 본 연구는 중국, 일본, 미국 주변국가의 소화수원 산정 기준을 비교하여 우리나라의 소화수원 기준이 이 국가들과 비교해 다른 점과 유사한 점은 무엇이며 장, 단점에 대해 조사했다. 주변 국가들을 통해 우리나라의 소화수원 기준이 국제적으로 어떤 위치에 있는지 확인할 수 있었으며 이를 통해 보다 발전된 소화수원 기준에 대한 발전적 제안을 한다.

• 한국경영과학회지
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• 제13권2호
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• pp.59-65
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• 1988

This paper discusses the problem of coordinating aggregate planning and production schedules, minimizing the combined set-up inventory and capacity costs. In this study, by using the relation of fixed production quantity and the number of set-up we develop a heuristirc procedure of solving the discrete demand, fixed production quantity, variable capacity problem. First, we obtain the trade-off between set-up cost and capacity cost, then search the point minimizing the combined inventory and capacity costs.

• 한국지열·수열에너지학회논문집
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• 제10권3호
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• pp.17-23
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• 2014

One major breakthrough in the field of heating, ventilation and air conditioning has been the development of heat pumps. Heat pump systems offer economic alternatives for recovering heat from different sources for use in various industrial, commercial and residential applications. In recent years, the heat pump has been tipped to have a very good potential for hot water production. This paper investigated the performance of a vapor injection heat pump with the variation of sub-cooler capacity at heating mode. The heating capacity of the vapor injection heat pump slightly increased with an increment of sub-cooler capacity, while COP didn't increase continuously. The 20% capacity of sub-cooler comparing with system capacity could be used as a standard to select sub-cooler capacity.

• 수산해양교육연구
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• 제26권5호
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• pp.979-990
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• 2014

Recently the frequency of coastal disasters caused by global warming is increasing and the damage is becoming greater. Therefore, the Korean government is establishing various policies and measures to minimize damage. For disaster prevention, this study will evaluate the disaster response capacity of each local resident(Eup/Myeun/Dong) in coastal areas through the survey. The purpose of this study is to quantitatively understand the disaster response capacity and analyze spatial autocorrelation between hot spots(vulnerable area) and cold spots. Thus this study was conducted a survey of 311 towns(Eup/Myeun/Dong) about the disaster response capacity of coastal residents. As a result, Namhae has the highest average score(4.9). On the contrary, Hampyeong has the lowest(1.6). Coastal residents in Namhae seem to have better understanding of first aid and preventive maintenance. But coastal residents in Hampyeong seem to not have these characteristics. Afterwards, this study builds a database of disaster response capacity, and analyzes it using the spatial autocorrelation method. Finally, the area of hot spots and cold spots for disaster response capacity was quantitatively detected.

• Carbon letters
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• 제1권3_4호
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• pp.148-153
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• 2001

The initial irreversible capacity, $Q_i$, is one of the parameters to express the material balancing of the cathode to anode. We introduced new terms, which are the initial intercalation Ah efficiency (IIE) and the initial irreversible specific capacity at the surface ($Q_{is}$), to express precisely the irreversibility of an electrode/electrolyte system. Two terms depended on kinds of active-materials and compositions of the electrode, but did not change with charging state. MPCF had the highest value of IIE and the lowest value of $Q_{is}$ in 1M $LiPE_6$/EC + DEC (1 : 1 volume ratio) electrolyte. IIE value of $LiCoO_2$ electrode was 97-98%, although the preparation condition of the material and the electrolyte were different. $Q_{is}$ value of $LiCoO_2$ was 0~1 mAh/g. MPCF-$LiCoO_2$ cell system had the lowest of the latent capacity. $Q_{is}$ value increased slightly by adding conductive material. IIE and $Q_{is}$ value varied with the electrolyte. By introducing PC to EC+DEC mixed solvent, IIE values were retained, but $Q_{is}$ increased. In case of addition of MP, IIE value increased and $Q_{is}$ value also increased a little.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.43-46
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• 2003

This paper presents capacity characteristics of the indoor LOS(Line-Of-Sight) propagation channel for MIMO system at 5GHz. The distance between antenna elements, their moving path, and number of transmitting and receiving antennas can be determined by wanted eigen-vlaue, and channel capacity of the MIMO communication channel using only reliable simulation without measurements. The simulation uses 3D Ray tracing and patch scattering model to which electromagnetic material constants are applied. As distance between antenna elements increases, distribution of the eigen-value show a tendency to decrease, but channel capacity increases in LOS environment. However, despite of short distance between antenna elements, large value of channel capacity is obtained in positions which have high AS. When the position of receiver antennas are shifted, channel capacity hardly changed, and as number of antenna elements increases, channel capacity also increases regularly.

• KIEE International Transactions on Electrophysics and Applications
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• 제3C권5호
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• pp.189-193
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• 2003

Initial irreversible capacity (IIC) can be defined by means of the initial intercalation Ah efficiency (IIE) and the initial irreversible specific capacity at the surface (IICs) with the linear-fit range of the intercalation so as to precisely express the irreversibility of an electrode-electrolyte system. Their relationship was IIC = Qc - Q$_{D}$ = (IIE$^{-1}$ - 1) Q$_{D}$ + IICs in the linear-fit range of IIE. Here, Qc and Qd signify charge and discharge capacity, respectively, based on a complete lithium ion battery cell. Charge indicates lithium insertion to carbon anode. Two terms of IIE and IICs depended on the types of active materials and compositions of the electrode and electrolyte but did not change with charging state. In an ideal electrode-electrolyte system, IIE and IICs would be 100%, 0 mAh/g for the electrode and mAh for the cell, respectively. These properties can be easily obtained by the Gradual Increasing of State of Charge (GISOC).OC).

• 대한산업공학회지
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• 제33권1호
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• pp.126-137
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• 2007

This study addresses the analytic models for estimating the capacity and performance of the multi-carrierCDMA system where several carriers would be assigned to a single cell to accommodate the required trafficdemand. Two key features of the multi-carrier CDMA system, carrier selections of new calls and inter-camerhard handoffs, are accommodated in the models, Computation experiments are conducted to show the effectiveness of the proposed model.