기상의 $NH_3$를 침전체로 사용하는 $BaTiO_{3}$ 분말의 합성

현성호,김정환,허윤행 대한환경위생공학회 1997 대한환경위생공학회지 Vol.12 No.1

The synthesis of high purity and ultra-fine $BaTiO_{3}$ by precipitation with gaseous $NH_{3}$ as precipitator was investigated to find an alternative process to solve various problems of present wet methods. This study consisted of two parts ; synthesis of $BaTiO_{3}$ precipitation with gaseous $NH_{3}$ and test of electrical property for the $La_{2}O_{3}$ doped $BaTiO_{3}$. The proper condition for the synthesis of $BaTiO_{3}$ by precipitation with gaseous $NH_{3}$ is as follows. The pH was 9.0. $H_{2}O_{2}$ mole ratio to $TiCl_{4}$ was 10. $NH_{3}$ gas follow rate did not influence the synthesis of $BaTiO_{3}$. The calcination temperature of $BaTiO_{3}$ was $300^{\circ}C$. Also, the synthesis of $La_{2}O_{3}$-doped $BaTiO_{3}$ was tested through the wet process. Under these condition, the shape of prepared $BaTiO_{3}$ powder was spherical type and the size of that was about $0.2{\mu}m$. After the powder was pressed, this green body was sintered at the $1300^{\circ}C$. Under these conditions, the water absorptance and the density of the obtained sintered body were below 0.04 %, 5.2 g/$cm^{3}$, respectively. Also the grain size of that was about $10{\mu}m$ and it was similar to commercial product.

초등학생 소방안전교육의 활성화 방안에 관한 연구- 경기도 고양소방서 소방과학교실을 중심으로 -

현성호,박경효,차정민,송윤석 한국화재소방학회 2009 한국화재소방학회논문지 Vol.23 No.2

본 연구에서는 어린이 안전교육 분야 중에서 소방안전교육을 중점적으로 다루고자 한다. 이에 먼저 소 방안전교육의 이론적 배경을 고찰하였고, 초등학교 안전사고현황과 사례를 분석하였으며, 현재 경기도 고 양소방서에서 실시하고 있는 초등학교 소방과학교실을 중심으로 소방과학교실의 교육개요 및 현황, 교육 목적 및 내용, 그리고 소방과학교실에 참여한 초등학생들과 담당교사를 대상으로 설문지를 통한 만족도 조 사를 실시하였다. 이러한 연구를 바탕으로 향후 화학이나 물리의 과학에 기반을 두고 있는 소방관련 화학 실험을 일반 및 청소년에게도 보급하여 자연스러운 소방교육 및 홍보 관련뿐만 아니라 학습과 소방상식을 동시에 직접 체험하는 즐거움(fun)과 놀라움(surprise)이 있는 프로그램으로 새로운 소방교육 홍보영역을 개발함으로서 우리나라 초등학교 소방안전교육의 활성화 방안에 관하여 대안을 제시하고자 하였다. The purpose of this study is to deal with fire fighting safety education primarily among the fields of child safety education. So, first of all, this study considered the theoretical background of fire fighting safety education. And this study analyzed the present state and cases of safety accidents in elementary schools. And by focusing on the fire fighting science class for elementary schools which Gyeonggi-do Goyang fire station is executing now, this study analyzed the educational outline, present state, educational goal, and content of fire fighting science class, and conducted the satisfaction survey through questionnaire over the elementary school students participating in fire fighting science class and the fire fighting officers in charge of fire fighting science class. On basis of this research, by developing the new field of fire fighting education and publicity into the program which can diffuse the fire fighting-related chemical experiment based on the science of chemistry and physics in the future and so provide the pleasure and surprise of experiencing directly not only natural fire fighting education and publicity but also learning and the common sense of fire fighting, this study tried to present the alternatives about the measures for activating the fire fighting safety education in elementary schools.

Ammonia gas를 침전제로 이용한 PZT 미분말의 합성 ( The Preparation of PZT Fine Powder Using Ammonia Gas as a Precipitator )

현성호,김정환,이한철,허윤행 대한환경위생공학회 1999 대한환경위생공학회지 Vol.14 No.1

기포탑반응기에서 연속공정을 이용한 BaTiO_(3)분말의 제조

현성호,김정환,허윤행 대한위생학회 1996 대한환경위생공학회지 Vol.11 No.1

The synthesis of high purity and ultra-fine BaTiO_(3) by precipitation with gaseous NH_(3) as precipitator was investigated to find an alternative process to solve various problems of recent wet methods. A synthesis process for BaTiO_(3) powder using NH_(3) gas as a precipitator in a bubble column reactor was experimentally successful in developing the production process of piezoelectric ceramic BaTiO_(3) powder. And a 2.33ml/sec is approprite for the feed flow rate, BaTiO_(3) powder produced under above the condition is spherical type, its particle size was about 0.2㎛.

Hartman식 장치에 의한 Carbon Black 분진의 부유중 폭발 위험성 평가

현성호,김정환,이창우 社團法人 韓國火災 ·消防學會 1998 한국화재소방학회논문지 Vol.12 No.4

Hartman식 분진폭발 장치를 이용하여 두 종의 카본블랙 High Black 10과 50L의 입도분포별, 농도별 그리고 동일한 입도분포에서 비표면적과 표면 기능기의 양에 따른 이들 시료의 분진폭발 확률, 분진폭발 압력 등을 조사함으로서 카본블랙 분진의 위험성을 평가하고자 하였다. 이에 카본블랙의 비표면적을 측정하고, 표면에 존재하는 기능기를 정량함으로서 휘발분이나 비표면적이 상대적으로 넓은 Hi-Black 50L의 경우 Hi-Black 10에 비해 상대적으로 폭발 확률과 폭발 압력이 크게 나타났으며, 최대폭발압력은 Hi-Black 50L의 입도분포 230/270 mesh, 시료농도 0.9 mg/㎤에서 약 6.0kg/㎠ 으로 나타났다. We investigated the weight loss according to temperature using Thermal Gravimetric Analysis(TGA) in order to find the thermal hazard of carbon black(Hi-Black 10, Hi-Black 50L) dusts, and the properties of dust explosion in variation of the surface functional groups and specific surface area of their dust with the same particle size. Using Hartman's dust explosion apparatus which estimate dust explosion by electric ignition after making dust disperse by compressed air, dust explosion experiments have been conducted by varying concentration and size of carbon black dust. The explosion pressure of both carbon black increased as the specific surface area increased. The results indicated that Hi-Black 50L of which specific surface area was larger three to four times than that of Hi-Black 10 was much easier of dust explosion.

소방공무원의 위험유발요인 인식에 관한 실증적 연구1): 경기 지역 및 소방 지역 공무원의 의식차를 중심으로

현성호,김영우,최희천 한국화재소방학회 2010 한국화재소방학회논문지 Vol.24 No.6

A firefighter is one of the most dangerous jobs. But in many precent studies, risk induction factors have been understood as direct accident causes and classification of the factors are not logical. This studies reviews risk induction risks and categorized them into institutional, cultural and personal experience factors. institutional factors, Institutional factors are composed of educational and working conditions. Cultural factors are composed of performance oriented and considerate parts. Personal experiences are divided into two parts: experiences about organizational members and about ordinary citizens. Survey showed that working conditions were recognized so poorly by firefighters. 소방공무원은 가장 위험한 직업 중 하나로 인식되고 있으며, 위험성은 소방공무원을 다른 분야의 공무원들과 근본적으로 차이를 가직 하는 특성으로 작용한다. 하지만 기존의 논문들에서는 위험유발 요인에 대해 직접적인 사고원인으로서만 접근하는 경향이 있었으며, 그 분류에 있어서도 논리적이지 못하였다. 본고에서는 소방공무원을 둘러싼 위험 유발 요인들은 제도적 요인, 문화적 요인, 그리고 개인적 경험으로 분류하였다. 제도적 요인으로는 교육에 관한 부분과 작업환경에 관한 부분으로, 문화적 요인들은 성과지향적문화와 배려지향적 문화로, 개인적 사고경험은 자신과 동료의 사고를 포함한 조직구성원의 사고경험과 기타 일반 희생자의 사고경험으로 나뉜다. 근무환경의 적정성과 관련해서는 특히 열악하게 인식하고 있었다. 조사 결과 소방공무원의 인식차를 가장 극명하게 드러낸 요소는 소방공무원의 근무지역이었는데, 서울지역이 경기 지역에 비해 다수의 항목에서 긍정적으로 인식하였다.

Starch분말의 연소특성에 관한 연구

현성호,김정환 경민대학 산학기술연구소 1999 경민대학연구논총 Vol.2 No.1

We had investigated combustion properties of starch powder. Decomposition of starch powder scavenged by precipitator of spinning factory with temperature were investigated using DSC and TGA. Combustion properties of starch powder according to amount were checked as temperature variation according to time using spontaneous ignition apparatus. Moreover, combustion properties with blowing or without blowing condition were checked in order to investigate combustion properties in spontaneous ignition apparatus according to flow condition of air. As results of thermal analyses, increase in raising temperature causes initial smoldering temperature to move towards low temperature section, In addition, as amount of starch was increased, initial smoldering temperature was lowered. All of combustion forms were smoldering combustion, Initial smoldering temperature was low more slightly with blowing condition than without blowing condition in spontaneous ignition apparatus, which condition made heating value high.

기업의 전략특허 발굴 프로세스 개선방안에 관한 연구: A사 사례를 중심으로

현성호,홍다운,김대호,이주헌,Hyun, Sung-Ho,Hong, Da-Un,Kim, Dae-Ho,Lee, Joo-Heon 한국벤처창업학회 2010 벤처창업연구 Vol.5 No.2

In the past, markets were taken over by the firms which could maintain their competitive advantage through economies of scale and associated reductions in costs and prices. However, it has been changed to a new time that companies can secure their competitiveness through continuos improvements and customer orientations. Patent holders can claim protection against any infringer of their patents. Thus, in the future, firms' competitiveness will be decided by patents and intellectual property rights. How can strategic patents can be obtained and secured? The purpose of this article is to provide a couple of suggestions that can help companies secure strategic patents and build their competitive advantages. Until now, Korean companies have been interested only in the quantity of patents, not the quality of patents. In addition, from the beginning, they could not build distinctive strategic positions to secure future valuable technologies. In this article, we provided a couple of suggestions for strategic patent identification processes. First, strategic patents should be identified and created based on the company's vision. Second, the company should create technology maps through investigating previous R&D activities and patented technology information before stating its own R&D activities.

소방공무원 선발시험에 관한 소고

현성호,이창우,송윤석 한국화재소방학회 2005 한국화재소방학회논문지 Vol.19 No.4

Fire fighting officials perform their works in the field and in most cases, undergo circular appointments for their service period. If they don't gain experience in field works, they have difficulty in performing faithful planning or administrative works. So they surely have to gain experiences in field works. Like this, fire fighting officials' works comprise a lot of fields, comparing with other job workers. So they need a strict body condition. The aim of this inquiry is to scrutinize body standards and important roles concretely which are necessary to fire fighting officials, to analyze written examination, physical test, physical strength test, and interview examination, and to establish the proposal which is necessary to improvement. 소방공무원은 주로 각종 현장활동을 수행하고 있고, 순환보직을 하는 경우가 많으며, 현장활동 경험이 부족한 상태에서 기획·행정 업무의 내실을 기하기 어려운 특성이 있어 현장경험을 반드시 필요로 한다. 이처럼 소방업무는 타 직종에 비하여 현장업무가 많은 비중을 차지하는 특성이 있으며, 그에 따른 엄격한 신체조건을 필요로 한다. 이에 본 고찰에서는 소방공무원에게 구체적으로 필요한 신체기준과 주요 임무는 무엇인지 살펴보고, 현행 소방공무원 채용을 위한 필기시험, 신체검사, 체력검사, 면접시험 등이 이에 부합되는지를 분석하여 그 개선안을 마련하는데 목적이 있다.

위험물안전관리자 강습교육의 개선방안에 관한 연구

현성호,송윤석,정두균 한국화재소방학회 2007 한국화재소방학회논문지 Vol.21 No.1

본 연구에서는 국내에서의 위험물 사고 현황을 분석함으로써 화재안전성 및 화재의식 측면에서의 취약 요인을 파악하였고, 위험물 안전관리자를 선임해야 하는 위험물제조소등의 종류 및 규모가 현재 법적으로 어떻게 규정되어 있는지 조사하였으며, 또한 한국소방안전협회에서 주관하는 위험물안전관리자 강습교육 을 받는 사람들을 대상으로 한 설문조사를 바탕으로 위험물 안전관리자 강습교육에 대한 보다 효율적이고 체계적인 강습교육과정을 마련코자 하였다. This study has grasped weakness factor fire safety and way aspect of fire analyzing hazardous material accident, and has investigated how by legal present kind and scale of hazardous material work that must assign hazardous material safety supervisor are prescribed. We have proposed efficient lecturing education time analyzing about validity and efficiency of education time about hazardous material safety supervisor lecturing education with question investigation to people who take hazardous material safety supervisor lecturing education that manage in korea fire safety association.