• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.11a
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• pp.587-590
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• 2000

The new core making method economized on core sand requested. The new method is heating core box until it reaches reasonable temperature and then spraying core sand with core binder into core box. Inner temperature distribution have to uniform in order to form core of uniform thickness. Therefore, in this study we treat of inner temperature distribution of core box in priority. First, determine proper torch number. Next, optimize the torch position to minimize the average of absolute deviation(AVEDEV) of inner temperature. The results are as followed : 1. The torch number that makes inner temperature distribution about $300^\circ{C}$ uniformly is 25. 2. When $S_H$ and $S_V$ is 0.7, the torch position is optimized and AVEDEV is 5.85.

• Journal of Industrial Technology
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• v.16
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• pp.5-11
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• 1996

While the enhanced biological phosphorus removal(EBPR), in anaerobic/aerobic condition, was known to remove phosphorus by means of metabolism of poly-P microorganisms, the phosphorus removed could be released in the form of ortho-P in the aerobic fixed biofilm reactor. This study was initiated to investigate the cause of ortho-P release in the aerobic fixed biofilm reactor. The resutls indicated that the phosphorus release was caused by autooxidation. The synthesis and release of phosphrous were related to the ORP and the boundary value for the phase change was about 170mV. In the synthesis phase, the phosphorus removal rate per COD removed was $0.023mgP_{syn}/mgCOD_{rem}$. The phosprous contents of the microorganism were 4.3 ~ 6.0% on a dry weight basis.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.11a
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• pp.389-394
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• 1996

The conceptual design of Korea Next Generation Reactor (KNGR), which is 3914 MWt PWR, includes the safety depressurization system (SDS) to comply with U.S. NRC's severe accident policy. In this analysis, it is assumed that three Monobloc Sebim valves are adopted for the SDS bleed valves of KNGR. The characteristic of Monobloc Sebim are modeled in the CE-FLASH-4AS/REM code for this analysis. The various feed and bleed (F&B) procedures with Sebim valves are investigated for total loss of feedwater (TLOFW) event. It is found that if operators open two out of three Sebim valves in conjunction with four HPSI pumps before hot leg temperature reaches saturation condition, the decay heat removal and core inventory make-up function can be successfully accomplished. Therefore, this F&B procedure can be used for mitigating the TLOFW event of the KNGR. This result also demonstrates the feasibility of adopting the Monobloc Sebim valves for the SDS of KNGR.

• Sleep Medicine and Psychophysiology
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• v.1 no.2
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• pp.182-187
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• 1994

The Authors report a case of sleep paralysis patient who is 25-years old man. He complained that he has been experiencing episode "being suffocated" during sleep and could not move by himself while semiconsciousness state. He was a only son of divorced parents and could not attach anybody from yong childhood. His symptoms was began intermittently after his early teens. Medical history and physical examination revealed no significant finding. A nocturnal polysomnogram showed loss of muscle tone during terminal REM period and sudden hyperventilation attack followed by wake-up. Psychosocial stress and insufficient sleep were presumed to be an etiological factors. Imipramine 50mg per day almost completely relieved symptoms.

• Asian Journal for Public Opinion Research
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• v.5 no.2
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• pp.104-126
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• 2018

As the second most populous province in Cambodia, Battambang also exhibits an increasing number of urban poor areas. This research focuses on the economic situation of slum areas in Battambang and how people in slum areas are affected by climate change. This research report describes socioeconomics of people living in slum areas in 4 villages in Battambang City. An investigation will be made on motivation of moving to slum areas, access to water, access to sanitation, access to electricity, transport and delivery, access to health care, access to education, security of tenure, cost of living in slum, literacy, and access to finance. We also explore the policy of the public sector toward climate change in Cambodia.

• Korean Institute of Interior Design Journal
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• v.22 no.1
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• pp.132-142
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• 2013

An event as philosophical thought is expanded throughout our society and affected largely an architectural field as well as aesthetics. Paying attention to this fact, this study is to relate the event to an architectural space and to find an interrelationship between them. Since Martin Heidegger who started to be regarded the event as a subject of thought, many philosophers revealed different thoughts about it. Architecture works of Louis I. Kahn, Peter Zumthor, Steven Holl, Bernard Tschumi, Rem Koolhaas who had the influences from the thoughts of Martin Heidegger, M. Merleau-Ponty, Jacques Derrida, Gilles Deleuze, are analyzed and compared their features. The reason why this relationship has become the subject of research is because the event can be confirmed to be connected with an architectural thoughts by correlating with aesthetic texts. Throughout this study, each architect, who is affected from philosophers, has different characters as they have different thoughts about events. This study is expected to be used as an literature data of intertextuality of philosophy and architecture.

• Journal of Korea Foundry Society
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• v.6 no.4
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• pp.277-283
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• 1986

The effects of copper as an alloying element on the microstructure of Compacted Vermicular graphite cast iron which was treated with Mg-REM spheroidizer have been studied. With the increase of copper content up to 2.0wt.%, the following results were obtained; First, the ratio of residual magnesium content in the as-cast iron has been found to be increased, possibly due to the decrease of sulfur content in the melt. Thus, the morphology of graphite in the as-cast iron has been found to be more nodular type. Second, the proportion of pearlite in the matrix has been found to he increased, however the matrix being with free carbide precipitates in the copper range of 1.2wt.% to 2.0wt.%. Third, the tensile strength of the as-cast iron in the temperature up to $400^{\circ}C$ was increased.

• Journal of Chest Surgery
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• v.30 no.1
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• pp.72-76
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• 1997

Myasthenia gravis is relatively rare disease which is related autoimmune response. There are various methods of management for myasthenia gravis, but nowaday radical thymectomy is the treatment of choice in the aspect of bringing out complete remission and clinical improvement. Sixteen patients of myasthenia gratis underwent radical thymectomy during last eight years, and its result was analysed. Complete rem ssion was achieved in five patients (31 %) and pharmacological or symptomatic improvement in seven patients (44%), thus giving a total remission in 12 patients (75%). Postoperative result was not correlated with age, sex, degree of preoperative symptom, surgical approach, pathologic diagnosis.

• Journal of Korean Society on Water Environment
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• v.22 no.2
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• pp.264-270
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• 2006

In this research, volume reduction of activated sludge using electrolysis was studied to find an optimum condition using lab scale experiments. Wasted sludge was treated by electrolysis with controlling current density, chloride concentration, electrode distance, and reaction time. Volume of return sludge was reduced by 9.79% in average while maximum was 16.7%. Sludge volume reduction efficiency was affected by current density and reaction time. It was reversely proportional to the electrode distance. Especially current density was effective on the system performance significantly. Electric conductivity, salinity and COD were increased by electrolysis implying sludge disintegrated and converted to COD in part. An empirical equation for total solid removal efficiency by electrolysis was proposed by multiple linear regression analysis as: $TS_{rem}$(%) = 5.534 ${\times}$ current density (A/l) + 0.178 ${\times}$ reaction time (m) + 2.758.

• Korean Architects
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• no.12 s.464
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• pp.53-59
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• 2007

최근 네덜란드의 건축은 세계 건축계에서 두각을 나타내고 있으며, 현대 건축사에 일 획을 긋는 등 중요한 역할을 하고 있다. 특히 우리에게 널리 알려진 Rem Koolhaas나 MVRDV등은 국내의 프로젝트에도 적극적으로 참여하여 그들의 진가를 잘 보여주고 있다. 이런 네덜란드 건축계와의 건축문화교류를 통해 그들이 일궈놓을 수 있는 독창성과 건축문화의 배경을 이해하고 우리의 건축문화를 위한 초석을 놓고저, 우리 협회는 지난 8월에 3명의 대표단을 보내 사전 조사를 시행한 바 있다. 그결과, Berlage Institute와 네덜란드 건축문화원과는 공감이 갈수 있는 건축적 이슈들을 국제토론의 장으로 이끌어 내는데 공조하기로 합의하고, 이의 후속 작업으로 Berlage Institute의 학장인 Rob Doctor교수와 네덜란드 건축문화원(Netherlands Architecture Institute, NAI)의 원장인 Ole Bouman 이 네덜란드의 건축정책을 소개하는 글을 게재하기로 했다. 이는 한국 건축사로서 현재 네덜란드에 유학중인 이은경씨의 도움에 의해 준비 되었고, 번역까지 도움을 주었다. 이은경씨의 도움에 진심으로 감사드린다.