단일전극을 가진 마이크로 가스센서의 제작 및 특성

송갑득,박영일,이상문,이윤수,최낙진,주병수,서무교,허증수,이덕동 한국센서학회 2002 센서학회지 Vol.11 No.6

센서의 안정도와 감도를 개선시킬 수 있는 단일전극을 가진 열선형 마이크로 가스센서를 제작하였다. 일반적으로, 금속산화물 반도체를 이용한 가스센서는 히터전극과 감지전극의 두 개의 전극을 가지고 있다. 제작된 센서는 히터전극위에 감지물질을 형성하여 단일 전극을 가지는 구조를 가지고 있다. 히터와 감지전극으로 사용되는 Pt는 glass 기판위에 스퍼터링법으로 형성하였으며, SnO_2 감지물질은 제작된 Pt 전극위에 열증착시켜 형성하였다. SnO_2막은 lift-off 공정을 이용해서 패턴을 형성하고 1시간 동안 산소분위기에서 열산화하였다. 제작된 소자의 크기는 1.92x.1 mm^2 이다. CO 가스에 대한 감지특성을 조사한 결과 1,000 ppm에 대해 100 mV의 출력변화를 나타내었으며, 넓은 농도범위(0 ~ 10,000 ppm에서 선형적인 전압출력을 나타내었다. 또한 가스 반응 전과 반응 후의 전압출력을 비교해 볼 때, 1 % 이내의 편차를 나타내는 우수한 회복성을 나타내었다. Micro gas sensor with single electrode was proposed for improving stability and sensitivity, Generally, metal oxide gas sensors have two electrodes for heating and sensing. This fabricated new type sensor have only a single electrode by forming a sensing material onto heating electrode. Pt as a heating and sensing electrode was sputtered on glass and a SnO_2 sensing material was thermally evaporated on Pt electrode. SnO_2 was patterned by lift-off process and then thermally oxidized in O_2 condition for 1 hr., 600 ℃. The size fabricated sensor was 1.9 x 2.1 mm^2. As a result of CO gas sensing characteristics, this sensor showed 100 mV change for 1,000 ppm and linearlity for wide range(0 ~ 10,000 ppm) of gas concentrations. And the sensor shows a good recovery characteristics of 1 % deviation compared to initial resistance.

장기간 보관한 멸균물품의 오염 상태에 관한 연구

주홍순,조순덕,정재심,신동분,임바올라,노은지,이선희,송영미,최정화,백병윤,김미나 대한병원감염관리학회 2003 의료관련감염관리 Vol.8 No.1

제주지역 만성 B형 간질환 환자에서 임상 양상에 따른 HBV 유전자형의 분포

송병철,김범준,정주영,염충호,이대호,김진석 제주대학교 생명과학연구소 2003 제주생명과학연구 Vol.6 No.1

Background/Aims: The genotype of HBV has been suggested to correlate with the clinical outcome of HBV infection. We analyzed the distribution of HBV genotype according to the clinical outcome of HBV infection in Jeju island. Methods: A total of 145 HBsAg-positive samples were enrolled. To identify specific patterns of HBV genotypes, we performed restriction fragment length polymorphism (RFLP). If typical restriction pattern of RFLP was not determined, phylogenetic analysis was performed. Results: RFLP analysis was possible in 65 patients. Clinical diagnoses of the 65 patients with chronic liver disease were as follows: HBeAg-positive healthy carrier (HBeAg+, anti-HBe-, HBV DNA+, transaminase normal: n=20): HBeAg seroconversion (n=12): chronic hepatitis B (n=14): liver cirrhosis (n=9): hepatocellular carcinoma (n = I0). Sixty-two patients showed typical restriction pattern by HinfI. However, 3 patients showed unique restriction pattern by HinfI, which were not reported in literature. When phylogenetic analysis was performed to classify the genotype of these 3 patients, they were also genotype C. Whereas, all patients showed typical restriction patterns by Tsp509l, which were reported in genotype C. Conclusion: All chronic HBV infection are genotype C in Jeju island regardless of clinical outcome.

수산자원관리체계에 관한 연구 : 통영지역을 중심으로

송병주,조민숙 경남대학교 환경문제연구소 2002 환경연구 Vol.25 No.-

The fish catches of Korea have been radically reduced because environments of coastal area are contaminated and fishery resources are reduced by the overfishing. So the government has enforced various policies for fostering fishery resources to increase the income of fishers and to provide smoothly with aquatic products. However, we are confronting with many problems resulted from the stagnation of fisheries industry from 1990. The problems are analysed with three points: socio-economic aspects, coastal environmental aspects and institutional aspects. In socio-economic aspects, many fishers are overburdened with the financial expenditure due to the excessive investments. Because of the reduction of relative incomes, the reduction of export increase rate, many fishers have threaten the fundamental fishery resources by doing as unlawful fishing activities. Also a cooperative association of fishery tend to center on the financial works rather than contribute to increasing the fisher's incomes. In coastal environmental aspects, the quality of water in the coastal areas is deteriorated by the filling-up and the land reclamation by drainage which are directed by the local governments. As a results, the deterioration makes a production of fishery decrease. So, it is needed to sustainingly protect the quality of water in the coastal areas. In institutional aspects, the fishery resources promotion policy ruled by the government has some doubts of practical effects because of the differences of jurisdictional areas and the services' scopes between the central government and the local government and a separation of jurisdictional departments in local government. Therefore, the investigation and analysis of the institutional arrangements must be preceded to contribute to the fishery resources-promotion policy.

TMN과 TINA 기반의 통합 망관리 시스템

김주영,이병곤,정영준,송화선 강원대학교 정보통신연구소 2000 정보통신논문지 Vol.4 No.-

This paper presents an optimum model to construct a TMN and TINA based integrated network management system. This proposed model provides efficient and reliable interoperability between heterogeneous networks and systems along with maintaining transparency and scalability among TINA and presents an optimum gateway scheme with comparison of their operational characteristics. As a result of this study, we present a distributed network management system based on TMN and TINA and discuss operational scenario.

갯쑥부쟁이(Heteropappus hispidus (Thunb.))의 감마방사선 감수성과 M1 세대 형질변동 특징

오병권,홍경애,송성준,유장걸,이선주,이영일 제주대학교 방사능이용연구소 2003 연구보고 Vol.17 No.-

제주도에서 자생하는 갯쑥부정이(Heteropappus hispidus(Thunb.))에 감마선을 10, 20, 40, 80, 120, 160, 200, 300, 400Gy 수준으로 나누어서 조사한 뒤 발아율 및 발아 30일 후의 본엽 출현을, LD_(50), 본엽길이, 줄기부분의 안토시아닌 색소 형성 유무, 생육 60일 후의 로젯형 엽, multi-shoot 형성율, 초장, 채화 결실율등의 주요 양적형질들을 생존개체를 대상으로 실시하였다. 120Gy 까지의 발아율은 88.5%로 대조구와 큰 차이를 보이지 않았으나 160Gy 이상에서 부터는 급격히 감소하여 치사선량(LD_(50))은 160Gy 범위 정도였다. 또한, 본엽 출연율과 그 길이는 조사선량이 높아질수록 억제되었다. 안토시아닌 색소 형성은 조사전량이 높을수록 대조구 2%에서 30%로 높아졌으며 로젯형도 고선량 처리구에서 발생하였다. Multi-shooting은 80Gy 이상일 때 부터 나타났으며 multi-shooting을 형성하는 개체들은 초장은 짧고 줄기는 가늘게 다발형으로 자라는 특성이 있어서 만일 형질이 고정된다면 화분 관상용 개체로 선발하기에 적합하였다. 특히, 조사선량이 증가됨에 따라서 안토시아닌 색소 형성, 로젯형 개체, multi-shoot등의 개체가 많이 출현되었는데 이는 돌연변이 유기의 선발지표가 될 수 있을 것으로 보인다. The seeds of naturally growing Heteropappus hispidus Thunb were treated by nine different doses(0, 10, 20, 40, 80, 120, 160, 200, 300, 400㏉) of gamma rays to investigate their germination rate and to quantify the characteristics of their germinated plant as like as leaf appearance and length, the formation rate of anthocyanin color in stem 30 days after germination, the formation rate of rosette leaf and multi-shoot, the flowering and seed-bearing, and shoot length. The germination rate at least up to 120 ㏉ was not greatly affected but was rapidly decreased at over 160 ㏉. It seemed that lethal dose(LD_(50)) of germination was 160 ㏉. The leaf appearance and growth was also inhibited, but the formation rate of anthocyanin color in the flower stem was enhanced up to 30% with dose. The rosette plants were observed in plants irradiated with higher than 40 ㏉. Multi-shoots were developed over 80 ㏉. For a short shoot length and bundle of thin stem, it was considered that they can be selected as the potential pot flower plants, through genetic fixation. In particular, it was suggested that the formation of anthocyanin color in flower stem, rosette and multi-shoot plants induced by the morphologically markers for the mutant selection of Heteropappus hispidus (Thunb.)

메탈핼라이드 램프용 저주파 구형파 구동의 퍼지제어 전자식 안정기

金柄哲,金亨坤,全仁柱,宋燦日 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2

A low frequency square wave driven electronic ballast for metal halide (MH) lamps is developed. The lamp current/wattage is controlled by fuzzy logic controller based on the low cost 8-bit microcontroller. This electronic ballast consists of a buck converter, a low frequency square wave full bridge inverter, a high voltage burst pulse generator using IGBT for the MH lamp ignition, an over-current protection circuit and an 8-bit microcontroller circuit. The ballast system is operated on the constant current mode during the MH lamp start-up process and the system is operated on the constant power mode during steady state. Experimental results show that the fuzzy logic control operation is carried .out successfully by the 8-bit microcontroller PIC16F877. In this electronic ballast system, in spite of the limited control bandwidth caused by low operating speed of the %bit microcontroller, the good performance in the constant lamp current characteristic is obtained. Acoustic resonance of the MH lamps can be effectively avoided because the instantaneous lamp power is fully constant due to the low frequency square wave drive.

갯쑥부쟁이(Heteropappus hispidus (Thunb.))의 감마방사선 감수성과 M1 세대 형질변동 특징

오병권,홍경애,송성준,유장걸,이선주,이영일 한국환경농학회 2003 한국환경농학회지 Vol.22 No.4

제주도에서 자생하는 갯쑥부쟁이(Heteropappus hispidus (Thunb.))에 감마선을 10, 20, 40, 80, 120, 160, 200, 300, 400 Gy 수준으로 나누어서 조사한 뒤 발아율 및 발아 30일 후의 본엽 출현율, LD_(50), 본엽길이, 줄기부분의 안토시아닌 색소 형성 유무, 생육 60일 후의 로젯형 엽, multi-shoot 형성율, 초장, 개화 결실률 등의 주요 양적형질들을 생존개체를 대상으로 실시하였다. 120 Gy 까지의 발아율은 88.5%로 대조구와 큰 차이를 보이지 않았으나 160 Gy 이상에서 부터는 급격히 감소하여 치사선량(LD_(50))은 160 Gy 범위 정도였다. 또한, 본엽 출현율과 그 길이는 조사선량이 높아질수록 억제되었다. 안토시아닌 색소 형성은 조사선량이 높을수록 대조구 2%에서 30%로 높아졌으며 로젯형도 고선량 처리구에서 발생하였다. Multi-shooting은 80 Gy 이상일 때 부터 나타났으며 multi-shooting을 형성하는 개체들은 초장은 짧고 줄기는 가늘게 다발형으로 자라는 특성이 있어서 만일 형질이 고정된다면 화분 관상용 개체로 선발하기에 적합하였다. 특히, 조사선량이 증가됨에 따라서 안토시아닌 색소 형성, 로젯형 개체, multi-shoot등의 개체가 많이 출현되었는데 이는 돌연변이 유기의 선발지표가 될 수 있을 것으로 보인다. The seeds of naturally growing Heteropappus hispidus (Thunb.) were treated by nine different doses (0, 10, 20, 40, 80, 120, 160, 200, 300, 400 ㏉) of gamma rays to investigate their germination rate and to quantify the characteristics of their germinated plants as like as leaf appearance and length, the formation rate of anthocyanin color in stem 30 days after germination, the formation rate of rosette leaf and multi-shoot, the flowering and seed-bearing, and shoot length. The germination rate at least up to 120 ㏉ was not greatly affected but was rapidly decreased at over 160 ㏉. It seemed that lethal dose (LD_(50)) of germination was 160 ㏉. The leaf appearance and growth was also inhibited, but the formation rate of anthocyanin color in the flower stem was enhanced up to 30% with dose. The rosette plants were observed in plants irradiated with higher than 40 ㏉. Multi-shoots were developed over 80 ㏉. For a short shoot length and bundle of thin stem, it was considered that they can be selected as the potential pot flower plants, through genetic fixation. In particular, it was suggested that the formation of anthocyanin color in flower stem, rosette and multi-shoot plants induced by the high dose of gamma rays could be utilized as the morphological markers for the mutant selection of Heteropappus hispidus (Thunb.).

지능형 원격 네트워크 온실

문병현,송주열,이현성,손경규,엄태환,김정우,김아름 대구대학교 정보통신연구소 2004 情報通信硏究 Vol.3 No.2

The system designed in this paper, can mark the interior state of greenhouse using sensors of temperature, humidity and illumination on greenhouse interior by greenhouse system for farm village area's agriculture automation. And, the real time monitor is possible real time monitoring by camera. Also, system that can supply water using spring cooler system and humidifier. The proposed system can sustain a designed environment of the greenhouse through rentilation fan, fluorescent light and roof door control. TCP/IP is used for the remote control of state the sensors in the client program. 본 논문에서 설계된 시스템은 농촌 지역의 농업 자동화를 위한 온실 시스템으로 온실 내부에 온도, 습도, 조도 센서를 이용한 온실 내부의 상태를 표시할 수 있으며 카메라를 이용하여 실시간 관측이 가능하다. 또한 본 시스템은 지붕 개폐, 스프링 쿨러와 가습기를 이용한 수분 공급, 환풍기, 형광등 등을 통하여 온실 내부의 환경을 유지시킬 수 있다. 모든 센서를 이용한 상태와 온실 제어를 TCP/IP를 이용한 클라이언트 프로그램에서 원격으로 관리할 수 있다.

인터넷 폭주제어 메카니즘의 성능 분석

이병곤,송화선,김주영,정영준 강원대학교 정보통신연구소 2002 정보통신논문지 Vol.6 No.-

The congestion control is one of most important factors to maintain QoS and to provide reliable services in Internet applications. This paper has studied Internet flow controls and discussed the characteristics of proposed congestion control mechanisms. This paper has analyzed their characteristics of the optimum parameters for congestion controls in respect with fairness and service throughput. Also this paper discusses how the offensive UDP traffics produce the performance degradation of TCP traffic services in congestion environment.