건전지의 본질안전 방폭성 평가에 관한 연구

지승욱,이광식,이동인,박원주,이춘하,김하호 嶺南大學校 工業技術硏究所 1997 工業技術硏究所論文集 Vol.25 No.1

Ignitability of explosive gas mixture by spark of dry cell in case of short circuit by accident was studied for the purpose of evaluation of intrinsically safe characteristics of dry cell that manufactured in Korea. IEC type spark test apparatus, 21±2[vol%] of hydrogen-air mixture, and dry cell that produced in Korea was used for the experiment. The result of this research could be used for design, manufacturing and using the intrinsically safe electrical apparatus.

형광등과 발광다이오드의 혼합광 조사가 아게라텀, 메리골드 및 살비아 실생묘의 생장 및 형태형성에 미치는 영향

허정욱,이춘우 충북대학교 첨단원예기술개발연구센터 1999 연구보고서 Vol.4 No.-

One of the factors to decide seedling quality has been known to control the plant height on production of plug seedlings. The growth inhibitor, physical stimulation, or DIF technique for controlling the plant height was commonly used. The experiment was conducted by mixing light with fluorescent lamps and Blue, Red, and Far-red Light-Emitting Diodes (LEDs) as a light source to investigate the effects of light quality on the growth and morphogenesis of flowering plants. Ageratum (cv. Blue Field), Marigold (cv. Orange Boy), and Salvia (cv. Red Vister) plants which developed with two true leaves were placed for 70 days in growth chamber, where air temperature and relative humidity were maintained at 25℃ and 70%, respectively. Photosynthetic photon flux on the culture shelf was kept at 10 μmol m-2 s-1, and photoperiod was provided at 16 h per day. In FL+Blue, FL+Red, and FL+Far-red treatments, total dry weight of Salvia plants was above 2 times greater than in FL treatment. Plant height of the flowering plants was the tallest in mixing light treatment with fluorescent lamp (FL) and Far-red LED. The plant height in all the plants was not significantly different between the FL treatment and the mixing light treatment with FL and Red LED. Number of flowers in Marigold and Salvia plants was not significantly different in all the treatments. Flowering rate of Ageratum plants on day 70 was 100% in all the treatments regardless of light qualities, although Marigold plants never bloomed in FL+Blue and FL+Far-red treatments during the culture period.

人系大腸菌의 抗菌性物質耐性 및 R因子의 分布

權旭鎭,徐城鐸,全燾基 慶北大學校 醫科大學 1976 慶北醫大雜誌 Vol.17 No.2

알루미나이징 表面處理한 構造用鋼의 彼勞强度 및 破壞擧動에 관한 硏究

吳世旭,朴春根,全泰玉,全哲昊,周原植,李圭用 東亞大學校 大學院 1978 大學院論文集 Vol.2 No.-

Aluminizing-treated structural steel is excellent in high temperature oxidation resistance, wear resistance and corrosion resistance. So, it has been widely used for the machine parts which have required such properties. However it is difficult to find out any study result of the notched influence on the aluminizing-treated materials and the second diffusion materials. In this investigation the low carbon steel plates with with V-notches were coated with aluminum and made into second diffusion. With these specimcns the bending fatigue strength and fatigue life were observed and also crack propagation of alloy layer was investigated. The results obtained are as follows: 1) On the smoothed specimens a fatigue limit of aluminizing material was lower than the one of raw material, but it was more increased than the one of heat treatment material, and the fatigue limit of second diffusion material was lowest. 2) On the V-notched specimens a fatigue limit of aluminizing material was higher with 44% increase ratio than the one of raw material and with 63% increase ratio than the one of heat treatment material, and the rate of increase became lower increase ratio in a fatigue limit comparing to aluminzing material, with no influence of notch radius. 3) According as the notch radius became smaller, the fatigue limit became. higher on the raw material, it was same on th aluminizing material and lowest on the second diffusion material. 4) Crack initiation period was 0.04% below of fatigue crack life and the full growth period of crack propagation at alloy layer was 0.1%. The crack propagation from alloy layer to matrix was 16% of the fatigue crack life. This means that the crack propagation rate at alloy layer was very fast but the crack delay at the boundary of both was so long. 5) Crack propagation grows through defects, inclusion, peeling and previous boundary.

발광다이오드를 이용한 광질과 일장조절이 '딕시 화이트' 미니 시클라멘의 개화와 생장에 미치는 영향

허정욱,이춘우,백기엽 충북대학교 첨단원예기술개발연구센터 2000 연구보고서 Vol.5 No.-

The study was conducted to investigate the effect of different light qualities and day lengths controlled by using Light-Emitting Diode (LED) of blue, red, or blue plus red provided by LED System on flowering and growth of F1 Cyclamen miniature. Cyclamen persicum 'Dixie White' seedlings which have raised for 170 days after sowing were grown under conditions of 20° C air temperature and 60% relative humidity. Day length was controlled by blue, re, or blue plus red light (1:1 in energy ratio) with 10 or 12 hr for 63 days. Photosynthetic photon flux in the treatments with 10 or 12 hr was about 100 or 83 μmol m-2 s-1, respectively. Fluorescent lamp treatment of 12 hr day length was considered as a control. Flowering and growth in all the treatments were significantly affected by light quality or day length tested in the experiment. Number of flowers, which opened above the leaf canopy, was higher in red light treatment with 10 hr day length than that in control. Days to flowering were the shortest in day length treatment of 10 hr per day with blue plus red light among the treatments. Blooming period was also the longest in red treatment regardless of day length and mixture light treatment, and thus above 20 days prolonged than that in control. Otherwise, number of unfolded leaves or net photosynthetic rate was not significantly affected by the different light qualities and day lengths.

저항을 이용한 프로판-공기 혼합가스의 점화한계 개선에 관한 연구

이춘하,오종용,옥경재,지승욱,이광식,심광렬 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.1

본 논문은 IEC형 불꽃점화 시험장치를 이용하여 저압 유도회로의 최소 점화한계를 프로판-공기 5.25 Vol.%의 혼합 가스에 대하여 실험적으로 구하였으며, 또한 유도회로의 인덕턴스 L에 안전소자로서 저항을 병렬접속하였을 경우 프로판-공기 5.25 Vol.%의 혼합 가스에 대한 점화한계 개선효과를 관찰하였다. 그 결과, 최소 점화한계는 전류의 크기에 따라 좌우되었다 또한, 전원으로부터 공급되는 에너지는 인덕턴스에 우선 축적되고. 그 초과분의 에너지가 폭발성 가스의 점화원으로 작용하였다. 점화한계 개선효과는 인덕턴스가 300 mH일 때, 최고 330%의 개선효과가 나타났으며 인덕턴스가 클수록 점화한계 개선효과가 크게 나타났다. 또한 병렬로 접속한 저항의 크기가 적을수록 점화한계 개선 효과가 크다. 본 연구결과는 본질안전 방폭형 전기기기의 연구개발을 위한 기본자료로 활용할 수 있을 뿐만 아니라 이들 기기의 방폭성능에 대한 시험자료로도 활용이 가능할 것으로 사료된다. This paper describes the minimum ignition limits for propane-air 5.25 Vol.% mixture gases in low voltage inductive circiuts. The improved effects on the ignition limit are studied by parallel safety components(resistors) for propane-air 5.25 Vol.% mixture gas in low voltage inductive circuits. The experimental devices used in this test are the IEC type spark ignition test apparatus. The minimum ignition limits are controlled by the values of current in inductive circuit. Energy supplied from elect source is first accumulated at the inductance, it's extra energy is working as ignition source of the explosive gas. The improved effects on the ignition limit are respectively obtained as the maximum rising rate of 330% by composing parallel circuits between inductance and resistor as compared with disconnecting inductance with the safety components. The more values of inductance increase the higher improved effects of ignition limit rise. The less values of resistor the higher improved effects of ignition limit rise. It is considered that the result can be used for not only data for researches and development of intrinsically safe explosion-proof machines which are applied equipment and detectors used in dangerous areas but also for datum for its equipment tests.

강진만에서 미생물의 년 변화

박종천,오재영,정용욱,주현수,이원교,유춘만,이우범 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-

The biological surveys were performed at seven sites in the Gangjin bay from February, 1998 to November, 2001. In order to analysis of environmental variation, numbers of heterotrophic bacteria, general fungus and fecal coliforms were enumerated in each sample. The result showed that variation range of heterotrophic bacteria, general fungus, and fecal coliforms were 2.9 x 10^(3)~9.6 x 10^(3) CFU/ml, 17.2~80.1 CFU/ml, and 6.3~682.5 CFU/100ml for four tears(1988~2001), respectively. Density of heterotrophic bacteria and general fungus were gradually decreased for four tours, while fecal coliforms were suddenly increased. Specially, numbers of fecal colifoms were increased the more 100 times in 2001 than that 1998. We think that it was probably caused a little rainfall in February, 2001. There result suggests that ecosystem of Gangjin bay were mainly regulated by 2~3 factors, which were inflow of fresh water, salinity and variation of water temperature.

초고층 주거건축의 공간환경에 따른 거주의식 비교 연구 : 주상복합형아파트와 단지형아파트 거주자의 만족도 분석을 중심으로 focused on dweller's staisfaction analysis of mult-used apartments and housing complex apartments

추영욱,윤장우,박춘근 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

The result that compare and analysis dwelling consciousness to space environment of apartment complex is as follow. Development of super highrise residential construction is enlivening in Busan. This is differented by multi-used apartments and housing complex apartments, and is in super highrise trend. Housing complex apartments appear higher satisfaction than multi-used apartments in dwelling generally. It was analyzed multi-used apartments are very poor in habitability and living environment side. Resident's improvement request is preferential request for convenient facilities. And while the improvement request about ventilation and lighting is higher in multi-used apartments, improvement request about outside view is higher in housing complex apartments.

용수 재이용을 위한 소규모 오수처리시설의 UV 소독시설에 관한 연구

윤춘경,정광욱,함종화 建國大學校附設農業資源開發硏究所 2002 農資源開發論集 Vol.24 No.-

Deterministic and probabilistic approaches to the design of ultraviolet disinfection system for water reclamation are reviewed and discussed. The high inactivation of total coliform (TC), fecal coliform (FC) and Escherichia coli (E. coli) by UV disinfection was demonstrated, and the inactivations of TC, FC and E. coli were 97%, 98% and 99%, respectively. Within the range of 0.3∼0.4m Ws/cm, the effect of UV does on the inactivation ratio was not observed. However, in the highest wattage of UV lamp, 39W, the inactivation ratio of TC, FC and E. coli was 100%, regardless of the UV does so the UV density was more effective on inactivation ratio of TC, FC and E. coli rather than UV does. Under the 0.4 mWs/cm and 16W of UV lamp, the effect of dissolved organic matter and turbidity on the inactivations of TC, FC and E. coli could not be observed in this study within the range of 0∼32mg/L and 0-40 NTU, respectively. The effect of suspended solid is Tc, FC and E.coli observed liner equation y=305.03x-3697, y=186.14x-2509.5, y=152.96x-1976.5(r^=0.51, 0.69, 0.80) respectively. Suspended solid is the most important factor for design of the UV disinfection system.

색채 선별기 영상보정 시스템 구현

이재균,김춘식,이채욱 대구대학교 정보통신연구소 2010 情報通信硏究 Vol.7 No.1

우리가 주식으로 하고 있는 쌀이나 곡물들은 대부분 색채 선별기(color sorter)를 이용하여 선별하고 있다. 이러한, 색채선별기의 성능을 좌우하는 것은 선별력이라 할 수 있고, 선별력을 좌우하는 가장 중요한 요소는 광학 선별 센서이다. 곡물을 선별하는 방식으로 포토센서 선별방식과 CCD 센서 선별방식으로 나눌 수 있다. 대부분의 시스템에서 CCD 센서 선별방식이 포토센서 선별방식보다 많이 사용되는데 그 이유는 많은 양의 원료를 한꺼번에 선별할 수 있기 때문이다. 기존 CCD 센서 색채선별기는 일정한 선별구역을 나누어 구역마다 영상신호 레벨차를 구별하여 선별신호를 보내는 데, CCD 센서의 동작에 있어서 보정 전의 영상신호는 렌즈로 기인한 프레임을 중심으로 하여 바깥쪽으로 구부러져 마치 배가 튀어 나온듯한 배럴(barrel)왜곡 현상이 발생한다. 본 논문에서는 마이크로 컨트롤러를 사용하여 이미지 센서에 검출된 왜곡 영상에 대한 보정을 할 수 있는 CCD 영상 보정회로시스템을 구현하고자 한다. We are doing to the food or corn and are assorting a color sorting machine. To decide the performance of such color sorting machine is the sorting technique. Most important element which controls the sorting technique is an optical sorting sensor. The method to assort the corn has the photo sensor method and CCD sensor method. CCD sensor is used much in most systems than a photo sensor method, because, it can select raw materials of much quantity at once. Existing CCD sensor color sorter sends sorting signal distinguishing a video signal level car in area dividing fixed sorting area, as long as relationship video signal hides by lens before revision in action of CCD sensor, because ship bounds hors awry laying stress on frame, one barrel (barrel) distortion phenomenon happens. In this paper, we proposed the CCD image compensation system using micro controller which can be compensate for detected distortion image in image sensor.