• 논리연구
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• 제17권3호
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• pp.425-440
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• 2014

최근 김한승 교수는 그의 논문 "확률과 시간에 관한 두 가지 퍼즐"(2014)에서 수리기사의 역설을 소개하고 이에 대한 흥미로운 논의를 내놓았다. 김한승(2014)에 따르면, 수리기사 역설에서 '오전'이 참일 확률과 '오후'가 참일 확률은 동일하지만 후회라는 감정의 본성상 '오후'를 선택하는 것이 합리적이다. 본 논문에서 필자는 김한승 교수가 수리기사 역설을 이해, 진단하는 방식에 대해 문제 제기를 하고(1, 2절), 그 역설의 한 가지 가능한 해결 방향에 대해 간략히 논의한다(3절). 필자가 보기에 후회의 감정은 수리기사 역설을 일으키는 중요한 원천이 아니며, 오히려 문제의 상황이 정말로 역설적인 이유는 후회의 부정적인 효용을 고려하지 않는다 하더라도 여전히 퍼즐이 발생하기 때문이다.

• 콘크리트학회지
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• 제27권1호
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• pp.41-44
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• 2015

• 자동차안전학회지
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• 제6권2호
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• pp.43-48
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• 2014

The flexible pedestrian legform impactor(Flex-PLI) consisting of a flexible femur and tibia will be tested for pedestrian protection by global technical regulation(GTR) within the next couple of years as a replacement for the existing transport research laboratory(TRL) legform impactor. In this study, a computer aided engineering(CAE) model was used to perform the effect analysis of each injury with regard to the changes in tolerance factors with the baseline results without tolerance. The tolerance factors were the height of impactor from ground reference line, initial velocity of impactor and rotation of impactor.

• 논리연구
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• 제15권1호
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• pp.17-53
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• 2012

잠자는 미녀 퍼즐이 등장한 지 벌써 10년이 되었는데 국내 철학자들도 이에 대해 자기 견해들을 내어놓았다. 송하석과 김남중은 미녀의 대답이 1/3이어야 한다고 주장하고 김한승은 관점에 따라 1/2과 1/3이 모두 가능하다고 주장한다. 나는 이 글에서 1/2주의를 선호할 만한 논증을 제안한다. 이를 위해 미녀가 받은 물음이 첫째 물음일 확률은 엘가가 가늠한 것보다 커야 한다는 것을 논증한다. 또한 미녀가 받은 물음이 첫째 물음이라는 것을 그에게 밝혔을 경우, 동전이 앞면이 이미 나왔을 확률이 1/2보다 큰 이유를 해명한다. 하지만 동전 던지는 시점을 미녀가 처음 깨어난 후로 바꿀 경우 오히려 1/3주의 해석이 옳다는 것을 보였다.

• 한국공간구조학회논문집
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• 제18권2호
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• pp.129-135
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• 2018

Following a 5.8 magnitude earthquake on September 12, 2016 in Gyeongju Province, a magnitude 5.4 earthquake occurred in the northern region of Pohang City on November 15, 2017 in South Korea. Only 7.9 % of the building structures are earthquake-resistant, according to the recent survey conducted by the government agencies in October 2017. In this paper, the linear analysis seismic performance evaluation procedure of the existing school structures presented in the revised methodology(Seismic Performance Evaluation Procedure and Rehabilitation Manual for School Facilities) was introduced. In this paper, the linear analysis evaluation procedure presented in the revised methodology was introduced and the seismic performance index of the example structure was evaluated using the linear analysis evaluation procedure. The seismic retrofit was verified by the linear and nonlinear dynamic analyses using Perform 3D. The analysis results show that the dissipated inelastic energy is concentrated on the retrofitted shear wall and the maximum inter-story drift of the stadium model structure with damping system satisfies the requirement of the current code.

• 한국자동차공학회논문집
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• 제13권6호
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• pp.77-83
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• 2005

Application of an electric heater is one of attractive methods for active regeneration in DPF systems, but its application has been limited by the capacity of electric power available in vehicles. This study was focused on intake throttling to reduce electrical energy required in the electrical heated DPF system. As results, this study showed the decrease of $30\~50\%$ of intake air mass flow rate and the increase of $20\~60^{\circ}C$ of exhaust gas temperature by the proper control of intake throttling. These intake throttling effects was helpful for regenerable temperature achievement.

• 한국지하수토양환경학회지:지하수토양환경
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• 제23권1호
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• pp.14-24
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• 2018

In soil washing, there are many variables including types of reagent and contaminant, washing time, soil-liquid ratio, washing cycles, washing agent concentrations, and etc. To identify the most influencing factors on soil washing process, regression analysis was performed for eight single variables and five combined variables. A quantitative model that employs W/H (molar ratio of washing agent to heavy metal) as a major variable was established based on the regression. The validity of the model was demonstrated by conducting lab experiments with Cu, Pb, Zn, Ni and As-contaminated soils, and various washing reagents including acetic acid, citric acid, malic acid, oxalic acid, ethylenediamine tetraacetic acid (EDTA) and nitriloacetic acid (NTA). The washing efficiencies were compared with the EDTA washing data reported in the literature. The correlation between W/H and removal efficiency was analyzed after dividing data into two groups according to the heavy metal mobility.

• 상하수도학회지
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• 제18권6호
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• pp.770-777
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• 2004

Three pilot-scale membrane systems were operated using lake water as influent in this study. Microfiltration (MF) membrane with pore size of 0.01 m was used in Systen I of which filtration mode was set at constant pressure of $1kgf/cm^2$. Ultrafiltration (UF) membranes with molecular cutoff (MWCO) of 80,000 and 13,000 were used in System II-1 and II-2, respectively. Constant flow mode was applied at the range between 0.7 and $1.5m^3/m^2{\cdot}d$ (average of $1.1m^3/m^2${\cdot}d) for System II-1 and between 0.37 and $1.65m^3/m^2{\cdot}d$ (average of $1.18m^3/m^2{\cdot}d$) for System II-2. In System I, the flux changed from $1m^3/m^2{\cdot}d$ to $0.2m^3/m^2{\cdot}d$ during the operation time of 5 months. System II showed recovery of 94% under the allowable maximum pressure of $3kgf/cm^2$ during the same operation period. From these results, the efficient operation was observed in constant flow mode with respect to filtration time and recovery. Average filtrate turbidity showed 0.0071 NTU in System I and 0.0054 NTU in System II, which implied that high turbidity removal was obtained in both MF and UF systems with no significant difference between MF and UF. From the fact that membrane flux depends largely on membrane type and operation mode, a guideline of optimum design and operation should be suggested for application of membrane systems to full scale water treatment.

• 논리연구
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• 제17권2호
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• pp.253-287
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• 2014

영어 'any'는 일차술어논리에서 'every', 'all', 'each' 등과 유사하게 다루어지지만, 자연언어에서 이들은 서로 다른 의미를 갖는다. 특히 'any'는 부정어와 함께 사용되는데, 언어학자들은 이 현상에 주목하고 이를 설명하고자 하였다. 필자는 기존의 언어학적 설명이 만족스럽지 못한 점을 지적하고 벤들러가 'any'의 논리적 특성에 관해서 오래 전에 제시한 철학적 통찰에 주목한다. 필자의 분석에 따르면 'any'는 벤들러가 '선택의 자유'라고 부르는 특성을 일차적으로 가지며 파인이 '임의의 대상'이라고 부르는 것을 가리킨다. 이 과정에서 필자는 'any'의 논리적 특성이 한국어 '아무'의 분석을 통해서 더 잘 드러난다는 점을 보인다. 필자는 이러한 분석이 중요한 철학적 함축을 갖는다고 생각하며, 그 한 가지 사례로 보편 일반화 규칙과 서문의 역설이 제기하는 문제가 'any'의 논리적 특성에 대한 분석을 통해서 새롭게 조망될 수 있음을 보인다.