• Research in Community and Public Health Nursing
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• v.29 no.2
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• pp.194-205
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• 2018

Purpose: The aim of this study is to investigate and elucidate actual experiences of alcoholics' spouses using familial social gatherings. Methods: A total of nine women whose alcoholic husbands were attending Al-Anon meetings held in Y Cathedral in S District of Seoul were included in this study. Data collection of this study was conducted through in-depth interviews with participants from September 24 to November 30, 2015. Data analysis was conducted at the same time as the data collection, and analysis was performed according to the method suggested by Colaizzi(1978). Results: We categorized the participants' experiences into five themes including 'Trapped in a Deep Dark Tunnel', 'Life of Walking in an Endless Tunnel', 'Reaching a Dead End', 'Walking towards a Ray of Light', 'Finding Oneself on a Strange Path'. Conclusion: The results of this study provide an understanding of the essential structure of the life experiences of alcoholic spouses using familial social gatherings.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.2044-2045
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• 2007

코로나 발생은 전극의 첨점이 형성되어 전극에 전계가 집중될 경우 불균질성에 의한 방전이다. 수용가용 154kV 인류형 클램프 말단의 전선처리는 코로나 발생을 가속시켜 전력손실, 노이즈 발생 등의 영향을 미친다. 본 연구에서는 수용가용 154kV 수전설비용 자기애자 (Porcelain Insulator)와 가공선로(Overhead Line)의 지지용 금구사이에서 발생하는 코로나 특성을 고찰하였다, 일반적 방법으로 확인 되지않는 코로나를 UV Image 이용하여 애자의 소손 위험성 및 상태를 제시하였으며, 유한요소법(FEMLAB)을 이용하여 나전선의 길이별로 전계분포에 의한 위험성을 제시하였다. 수전설비의 설치조건 및 금구류의 유지보수 및 안전성 향상에 활용될 것으로 기대한다.

• Proceedings of the Membrane Society of Korea Conference
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• 1998.10a
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• pp.82-85
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• 1998

1. 서론 : Cyclodextrin(CD) 동족체(homologues)는 $\alpha$-, $\beta$-, $\gamma$-CD로 구분되며, 이들 각각은 $\alpha$-D-glucopyranose 단위체 6,7, 및 8개가 비환원성 환상구조로 연결된 cyclic maltooligosaccaride의 일종으로 외부는 친수성이고, 내부는 소수성인 공동 구조를 갖고 있다. 따라서 각 CD는 동공의 크기가 달라 다른 크기의 소수성 물질들과 선택적인 포접화합물 (inclusion compound)을 형성하는 특징이 있다. CD 동족체는 전분 분해 효소인 cyclodextrin glycosyltransferase(CGTase)에 의해 전분으로부터 생산되는데, 반응용액 내에서의 CD 동족체 농도가 어느 한계값 이상으로 높아지면 생산물 저해와 다른 환원당으로의 분해 때문에 생산성이 감소하여 이의 효과적 생산에 어려움이 있다. 본 연구는 dead-end 및 cross-flow형 막 생물반응기를 사용하여 CGTase에 의한 전분의 CD 동족체로의 분해반응시 생산물 저해를 억제시켜 생산성을 향상시키고, 동시에 조작조건 변화에 따른 생산물인 CD 동족체의 효과적인 연속분리 가능성을 검토하였다.

• Wind and Structures
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• v.17 no.3
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• pp.345-359
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• 2013

Turkey has been hosted various civilizations throughout centuries and it has become one of the oldest settlements all over the world due to the geographical location. Therefore, it has accommodated innumerable historical structures remain from the past civilizations. Protection and conservation of these historical constructions should be the major points for continuity of history. Crooked minaret is one of between these historical invaluable structures. It is located at the city of Aksaray and it dates back approximately 800 years. The minaret has lost its vertical position in time and bends on the North-West direction. In this study, general information is given about minarets and some restoration recommendations are given for crooked minaret based on performed some finite element structural analyses. These analyses are considered into three cases; 1-Dead loading, 2-Wind loading, and 3-Earthquake loadings. Results from the analyses are discussed detailed and some useful recommendations are given in the end of the study.

• Bulletin of the Korean Chemical Society
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• v.22 no.3
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• pp.288-292
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• 2001

The kinetic mechanism of Hafnia alvei aspartase in the amination direction has been determined in the absence of metal. The initial velocity pattern obtained by varying the concentration of fumarate at several fixed concentrations of NH4+ , shows an intersection on the left of the ordinate at pH 7.0, indicating that the kinetic mechanism is a sequential mechanism in which substrate inhibition by fumarate is observed. The dead-end inhibition pattern by varying the concentration of NH4+ at several fixed concentration of succinate shows an intersection on the left of the ordinate. These data are consistent with random addition of NH4+, or fumarate. The Haldane relationship gives a Keq of 1.18 ${\times}$10-3 M at pH 7.0, which is in agreement with the values obtained from the direct determination of reaction concentrations at equilibrium (6.0 $\pm0.2$ ${\times}$10-3 M).

• Transactions of the Korean hydrogen and new energy society
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• v.32 no.4
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• pp.263-270
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• 2021

In this study, we proposed the necessity of reusing the battery industry after domestic use, preparing legal arrangements by step for recycling, clarifying responsible materials by processing stage, and establishing infrastructure and screening diagnostic rating system. The purpose of this study is to establish a life cycle integrated management system for electric vehicle batteries and to find suitable ways for improving the lifespan of electric vehicle batteries, reuse, and recycling in stages to avoid other environmental pollution problems due to batteries after using electric vehicles used to reduce environmental pollution due to climate change.

• Journal of the Society of Disaster Information
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• v.13 no.2
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• pp.249-257
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• 2017

Recently, a cable disconnection accident occurred due to a lightning strike at the Seohae Bridge located in Dangjin-Pyeongtaek City. This is a natural occurrence, but it is a recall that it is very important to review the safety issues due to the disconnection of cable bridges. In other words, the role of cables in cable bridges has a profound effect on the safety of the structure, and it has become necessary to grasp the effect on the entire structural system. The cable bridge is an economic bridge that builds the main tower and supports the bottom plate by cable. The influence of the cable is the main member, which is a big influence on the safety of the whole bridge system. In the cable-stayed bridge, the cables exhibit nonlinear behavior because of the change in sag, due to the dead weight of the cable, which occurs with changing tension in the cable resulting from the movement of the end points of the cable as the bridge is loaded. Modal analysis is conducted using the deformed dead-load tangent stiffness matrix. A new concept was presented by using divided a cable into several elements in order to study the effect of the cable vibration (both in-plane and swinging) on the overall bridge dynamics. The result of this study demonstrates the importance of cable vibration on the overall bridge dynamics.

• Membrane Journal
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• v.13 no.2
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• pp.81-87
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• 2003

The permeation experiments f3r the aqueous dextran solutions of which the molecular weights were distributed between several thousands and million daltons were carried out using the dead-end cell system equipped with sheet membrane to determine the molecular weight cut-off (MWCO) of ultrafiltration membranes. The dextran rejections with respect to molecular weight were obtained by GPC analysis of feed and permeate solutions, then the MWCO was decided as the dextran molecular weight corresponding to the 90% rejection. The MWCO of PBTK membrane manufactured by Millipore was varied between 63,000 and 68,000 daltons as the pressure increased from 0.5 to 2.0 bar. However, the MWCO of PBQK(Millipore) and UE 1812(Saehan) under the above operating pressure increased to 3.5 and 4.3 times, respectively. Also, the MWCO of PBTK increased to 25% as the membrane permeation increased from 10 to 40% of the feed solution.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.3
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• pp.233-239
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• 2013

A 100 W fuel cell system using chemical storage method has been applied for a propulsion system of the SUAV(Small Unmanned Aerial Vehicle). A fuel cell and battery have been combined for both the small/light hydrogen generation control system and the hybrid power supply system. A small hydrogen generation device was implemented to utilize NaBH4 aqueous solution and dead-end type PEMFC system, which were evaluated on the ground and by the flight tests. The system pressurized at a 45kpa stably operates and get higher fuel efficiency. The pressure inside of the hydrogen generation control system was maintained at between 45 kPa and 55 kPa. The 100W fuel cell system satisfies the required weight and power consumption rate as well as the propulsion system, and the fuel cell system performance was demonstrated through flight test.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.3
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• pp.226-232
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• 2013

A compact hydrogen generation device of fuel cell system using chemical hydride storage technique was designed to fit the propulsion device requirement of a small unmanned aerial vehicle(SUAV). For high efficient, compact, and lightweight hydrogen generation control device, the Co-B catalyst hydrogen conversion rate by $NaBH_4$ aqueous solution flux is measured so that the proper amount of Co-B catalyst for maximum hydrogen generation of 100W stack was proposed. A compact hydrogen generation device is controlled by pump's on/off using its own internal pressure and consumes fuel in high efficiency through a dead-end type fuel cell. The fuel cell system has stable operation for a planed flight profile. The system operates up to maximum 7 hours and at least 4 hours for tough flight profiles.