• 한국정보통신학회논문지
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• 제20권5호
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• pp.1005-1012
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• 2016

독립된 해상 지역에서 운용되는 LED 등명기는 태양광전력공급시스템을 주로 이용하고 있으며, 이는 등명기의 관리 및 유지비용을 크게 높이는 원인으로 알려져 있다. 이를 해결하기 위해 일체형 LED 등명기에 대한 기술 연구 및 실증이 최근 활발히 진행 중이다. 본 논문은 LED 등명기의 효과적인 관리를 위해, BLE 기능을 갖는 일체형 LED 등명기 제어시스템을 제안한다. 일체형 LED 등명기의 상태정보 프로토콜을 확장하여 제어 프로그램 구조를 설계한 후 그를 관리자가 쉽게 파악할 수 있는 형태로 구현한다. 구현된 제어시스템은 일체형 LED 등명기의 상태 및 제어 데이터를 시각화함으로써 관리자의 신속한 의사결정을 가능하게 한다. 또한 등명기의 전력사용을 최소화하면서 상태정보를 송수신하고 등질을 변경할 수 있다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.92.1-92
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• 2002

$\textbullet$ A compact and robust wall-climbing robot, called MRWALLSPECT-II, is developed. $\textbullet$ The robot is a self-contained system for scanning external surfaces of gas or oil tank. $\textbullet$ The robot has advantages of reduced actuators, parts and easy control. $\textbullet$ The mechanism of the robot employs a closed link mechanism. $\textbullet$ Self-Contained, Wall-Climbing, MRWALLSPECT

• Journal of Mechanical Science and Technology
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• 제18권4호
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• pp.573-581
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• 2004

A self-contained wall climbing robot, called MRWALLSPECT (Multi-functional Robot for WALL inSPECTion) II, is developed. It is designed for scanning external surfaces of gas or oil tanks with small curvature in order to find defects. The robot contains all the components for navigation in itself without any external tether cable. Although it takes the basic structure of the sliding body mechanism, the robot has its original characteristic features in the kinematic design with closed link mechanism, which is enabled by adopting a simple and robust gait pattern mimicking a biological system. By employing the proposed link mechanism, the number of actuators is reduced and high force-to-weight ratio is achieved. This paper describes its mechanism design and the overall features including hardware and software components. Also, the preliminary results of experiments are given for evaluating its performances.

• 한국화재소방학회논문지
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• 제24권3호
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• pp.45-51
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• 2010

본 논문은 공기호흡기 사용실패 유형과 원인을 생산자에 대한 정부규제와 고객에 대한 정부규제의 문제점을 중심으로 분석한다. 전자의 경우 용기 및 공기호흡기의 안전검사 기준의 한계점 분석이고, 후자의 경우 사용자관리자의 유지관리 및 폐기처분 규정의 한계점 분석이다. 개선방안으로는 수거검사와 수집검사를 확대, 폐용기 처리 결과 감시확인 절차의 투명성 강화 등이 있다.

• Macromolecular Research
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• 제17권9호
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• pp.631-637
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• 2009

This study examined the unique self-doping behavior of carboxylated polyaniline (PCA). The self-doped PCA was synthesized using an environmentally benign enzymatic polymerization method with cationic surfactants. XPS showed that HCl-doped PCA contained approximately 34% of protonated amines but self-doped PCA contained 9.6% of the doped form of nitrogen at pH 4. FTIR and elemental analysis showed that although the PCA was doped with the proton of strong acids at low pH via the protonation of amines, the self-doping mechanism of PCA at pH > 4 was mainly due to hydrogen bonding between the carboxylic acid group and amine group.

• 한국가정과교육학회지
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• 제3권1호
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• pp.113-129
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• 1991

This study was conducted to compare the outward aspects, objectives, and the contents of Home Economics text books of middle schools of Korea, Japan, U.S.A. and England. The results were summarized as follows. 1. The outward aspects of tex books： The Korean text books were small in size and the quality of paper was inferior to those of foreign countries. The Japanese text books were written by many authors, contained many lab works and data. Text books of U.S.A. were big in size made with good quality paper and contained many colour pictures. Text books England contained many problems and lab works. 2. Objectives of the Home Economics and Unit objectives： The objective of the subjects of Home Economics was written only in Korean text books. The unit objectives were described most concretely and detailedly in Korean text books comparing with other countries. 3. Contents： Korean text books covered all six areas of foods, clothings, housing, home management, family and occupation and theoretical explanations prevailed. Japanese text books contained numerous lab works, lacked two areas of home management and occupation, thecontents included a few practical lab works two areas of home management and occupation, the contents included a few practical lab works. In the text books of U.S.A. contained all six areas of Home Economics were covered and special emphasis was placed on self discovory and self development, and vocational guidance was also stressed. The text book of England contained only three areas of Home Economics, clothing, foods and housing； the number of area was limited but the basic theories of covered area was intended to lead to self comprehension through questions and lab works.

• 인터넷정보학회논문지
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• 제13권5호
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• pp.93-104
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• 2012

오늘날 사용하고 있는 네비게이션의 신뢰성은 기술적인 발전을 통해 상당히 높아졌다. GPS는 위성기반 위치추적 시스템으로 가장 광범위하게 사용되는 기술이다. 하지만 GPS기반 시스템은 위성이 정확한 뷰를 제공해줄 때에만 위치추적이 정확하다. 본 연구에서는 추적을 위해 내부구조에 의존하지 않는 독자적인 네비게이션을 제안한다. 스마트폰의 내장센서와 내장 맵을 사용하여 정확한 차량 위치추적을 구현한다. 성능평가 결과 정확한 차량의 위치 지원 면에서 우리가 제안한 시스템이 GPS보다 성능이 우수함을 나타내었다.

• Safety and Health at Work
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• 제9권4호
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• pp.468-472
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• 2018

Background: Firefighters are required to use self-contained breathing apparatus (SCBA), which impairs ventilatory mechanics. We hypothesized that firefighters have elevated arterial $CO_2$ when using SCBA. Methods: Firefighters and controls performed a maximal exercise test on a cycle ergometer and two graded exercise tests (GXTs) at 25%, 50%, and 70% of their maximal aerobic power, once with a SCBA facemask and once with protective clothing and full SCBA. Results: Respiratory rate increased more in controls than firefighters. Heart rate increased as a function of oxygen consumption ($V_{O_2}$) more in controls than firefighters. End-tidal $CO_2$ ($ETCO_2$) during the GXTs was not affected by work rate in either group for either condition but was higher in firefighters at all work rates in both GXTs. SCBA increased $ETCO_2$ in controls but not firefighters. Conclusions: The present study showed that when compared to controls, firefighters' hypoventilate during a maximal test and GXT. The hypoventilation resulted in increased $ETCO_2$, and presumably increased arterial $CO_2$, during exertion. It is proposed that firefighters have altered $CO_2$ sensitivity due to voluntary hypoventilation during training and work. Confirmation of low $CO_2$ sensitivity and the consequence of this on performance and long-term health remain to be determined.

• 한국안전학회지
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• 제33권6호
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• pp.77-84
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• 2018

Report documents of industrial and occupational accidents have continuously been accumulated in private and public institutes. Amongst others, information on narrative-texts of accidents such as accident processes and risk factors contained in disaster report documents is gaining the useful value for accident analysis. Despite this increasingly potential value of analysis of text information, scientific and algorithmic text analytics for safety management has not been carried out yet. Thus, this study aims to develop data processing and visualization techniques that provide a systematic and structural view of text information contained in a disaster report document so that safety managers can effectively analyze accident risk factors. To this end, the risk factor map using text mining and self-organizing map is developed. Text mining is firstly used to extract risk keywords from disaster report documents and then, the Self-Organizing Map (SOM) algorithm is conducted to visualize the risk factor map based on the similarity of disaster report documents. As a result, it is expected that fruitful text information buried in a myriad of disaster report documents is analyzed, providing risk factors to safety managers.

• Restorative Dentistry and Endodontics
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• 제16권1호
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• pp.158-166
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• 1991

In order to investigate the cytotoxicity of composite resin in vitro, BALB / C mouse fibroblast were cultured in MEM in which silux, P-50, microrest, clearfil, amalgam and glass - ionomer, in shape of $2{\times}9mm$ circular disk. The experiments were- performed by cell count on 4 hours, 1, 3, 6 days and the composite resin groups, amalgam, glass - ionomer were compared. 1. On the sixth day, the cellular number of resin composite groups were remarkedly reduced, in contrast, the that of amalgam and glass - ionomer group continuously increased. 2. It was only on the 4 hours that the cellular number contained in amalgam were reduced, but increased thereafter, and the cellular number contained in glass - ionomer are greater than other groups. 3. In resin group, especially between self - curing resin and light - curing resin, there is no difference in cellular number statistically (p>0.05). 4. It was amalgam where the round cell without cellular process was found on the 4. hours and on the 6 th day the cell without cellular process was found numeroulsy in resin group whereas in amalgam and glass - ionomer, like control group was contained cell forming monolayer. These result suggested that the toxicity of the self - curing and light - curing resin greater than that of the amalgam and glass - ionomer.