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비분산적외선 CO₂센서를 이용한 무선 센서 네트워크 기반의 지하 공기질 모니터링 시스템
권종원(Jong-Won Kwon),김조천(Jo-Chun Kim),김규식(Gyu-Sik Kim),김희식(Hiesik Kim) 대한전자공학회 2009 電子工學會論文誌-SC (System and control) Vol.46 No.4
본 연구에서는 비분산적외선(NDIR) 방식의 CO₂센서를 이용하여 무선 센서 네트워크 기반의 지하 공기질 모니터링 시스템을 구현하고 실제 지하철 승강장에 설치한 후 성능평가를 수행하였다. 서울 지하철은 하루 650만 명이 이용하는 대표적인 대중교통 수단이다. 따라서 승객뿐만 아니라 지하철 역사의 지하 공간에서 근무하는 많은 근로자들의 건강에 대한 관심이 높아짐에 따라 지하철 역사의 공기질 모니터링에 대한 요구가 매우 높아졌다. 현재 이런 요구를 충족하기 위해 환경부와 지하철 운영기관 측에서는 지하철역 공기질 모니터링 시스템을 일부 설치 운영 중이다. 그러나 고가의 수입 센서 이용으로 장비의 규모가 크고 설치 및 상시 운영에 따른 유지보수 비용이 큰 한계점이 있다. 따라서 본 연구에서는 저비용으로 CO₂ 농도를 상대적으로 정밀하게 측정할 수 있는 상용화된 CO₂ 센서에 대해 이론적으로 분석하고 신뢰성 검증 테스트를 수행하였다. 또한 무선 공기질 측정 센서 노드 및 게이트웨이 시스템을 개발하여 지하철 승강장의 실시간 공기질 데이터를 주기적으로 수집할 수 있고, 효율적으로 모니터링 할 수 있는 웹서버를 구축하였다. 본 연구 결과는 향후 지하 공간 공기질 관리 시스템의 확산 설치를 위하여 기초 연구 자료로 활용될 것이다. In this study, a remote air quality monitoring system for underground spaces was developed by using NDIR-based CO₂ sensor. And the remote monitoring system based on wireless sensor networks was installed practically on the subway station platform. More than 6.5 million citizens commutate everyday by the Seoul subway transportation that is the most typical public transportation. They concern about air quality with increasing interest on public health or many workers in subway stations or underground shopping centers. Recently, the Korean Ministry of Environment has operated the air quality monitoring system in some subway stations for testing phase. However, it showed many defects which are large-scale, high-cost and maintenance of precision sensors imported from abroad. Therefore this research includes the reliability test and a theoretical study about the inexpensive commercialized CO₂ sensor for reliable measurement of air quality which changes rapidly by the surrounding environments. And then we develop the wireless sensor nodes and the gateway applied for remote air quality monitoring. In addition, web server program was realized to manage air quality in the subway platform. This result will be valuable for a basic research for air quality management in underground spaces for future study.
정제의 제조설계에 관한 연구. 직타법에 의한 Prednisolone 정제의 제조에 있어서 무수유당 및 옥수수전분의 영향
권종원(Jong Won Kwon),민신홍(Shin Hong Min),이상희(Shang Hi Rhee),김용배(Yong Bae Kim) 대한약학회 1976 약학회지 Vol.20 No.2
Prednisolone tablet product design problem was structured as constrained optimization problem and subsequently solved by multiple regression analysis and Lagrangian method of optimization. Prednisolone was the drug chosen and anhydrous lactose and corn starch were the adjuvants. The effect of anhydrous lactose and corn starch concentrations on tablet hardness, volume, disintegration time and in vitro release rate was studied. The concentrations of anhydrous lactose and corn starch used in this experiment were 30~60 percent and 5~30 percent, respectively. A full second-order (quadratic) model with all possible two-factor interactions was employed. To obtain the values of anhydrous lactose and corn starch which minimize the in vitro release time (t60%) subject to the constraint on tablet hardness, disintegration time and volume, we solved the Lagrange function. Multiple correlation coefficients for the regression models were correlated at less than 0.05 level and it was found that the optimum concentrations of anhydrous lactose and corn starch were 45 percent and 21 percent, respectively.
LED신호등의 원형 배열을 이용한 새로운 신호 체게 설계구현
박용만(Yong-Man Park),권종원(Jong-Won Kwon),오드게럴(Odgere. l),김희식(Hiesik Kim) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
Currently the indication method of the traffic signal light which is established in our country displays each "red, yellow, green" using the brightness LED signal light. In this paper, one LED circular arrangement replaces the Current indication method of the traffic signal light using two color LED. Also the blinking signal function of present time uses the MCU of AVR series and it is embodied with magnification and abridgment of the circular arrangement for recognizing easily far away. The signal light indication method which is proposed will be able to substitute the signal light of 3 colors with 1 signal light with economic profit presented the reform measure of energy efficiency improvement together.
압축코팅법에 의한 3단계 약물방출형 지속성제제의 제조 및 용출특성
김철수,권혁노,차봉진,권종원,양중익,민신홍,Kim, Cheol-Soo,Kwon, Hyeok-Lo,Cha, Bong-Jin,Kwon, Jong-Won,Yang, Joong-Ik,Min, Shin-Hong 한국약제학회 1992 Journal of Pharmaceutical Investigation Vol.22 No.2
A novel oral controlled release tablet which may offer more uniform drug level in the body than simple zero-order was developed. The tablet is composed of three layers; outer film layer, middle part compression-coated hydroxypropylmethylcellulose (HPMC) matrix layer, and inner core layer. Each layer contains nicardipine HCl as a model drug. In vitro dissolution test showed that the tablet released the drug in clear three steps; a rapid initial release, followed by a constant rate of release, and then a second phase of fast release of drug. The dissolution characteristics could be modified easily by changing the grade of HPMC, thickness of matrix layer, content of methylcellulose in matrix layer, content of active ingredient in each layer. The pH of dissolution medium did not affect the release profile. This three-step release system is expected to raise the blood concentration rapidly to effective level and to maintain effective blood level longer than simple slow-release systems.
효소반응법을 이용한 우황 및 우황함유 액상 제제 중 총담즙산의 정량
하인식,김승환,차봉진,권종원,양중익,민신홍,Ha, In-Sik,Kim, Seung-Hwan,Cha, Bong-Jin,Kwon, Jong-Won,Yang, Joong-Ik,Min, Shin-Hong 한국약제학회 1991 Journal of Pharmaceutical Investigation Vol.21 No.2
A simple and sensitive method was developed for the quantification of free and conjugated bile acids in bezoar without prior hydrolysis. $3{\alpha}-Hydroxy$ bile acids are first oxidized to 3-keto bile acids in the reaction catalyzed by $3{\alpha}-hydroxysteroid$ $dehydrogenase(3{\alpha}-HSD)$. During this oxidative reaction, an equimolar quantity of nicotinamide adenine dinucleotide(NAD) is reduced to NADH and subsequently oxidized to NAD with concomitant reduction of nitrotetrazolium blue(NTB) to diformazan by the catalytic action of diaphorase. The diformazan has an absorbance maximum at 540 nm. The intensity of the color produced is directly proportional to bile acids concentration in the bezoar extracts. The optimum conditions for the enzymatic reaction such as effects of reaction time, reaction temperature and pH, and stability were investigated. Calibration plots for the sodium chelate observed to be linear and intra-, inter-assay analytical recovery of bile acids averaged $97.65{\pm}3.4%(S.D.)$. Therefore, it is considered that the quality control of total bile acids from bezoar or bezoar-containing liquid preparation using this simple and sensitive assay system will be acceptable. Also current bezoars and bezoar-containing liauid preparations were examined their total bile acids from this method.
정명화,정엽,정대식,권종원,양중익,민신홍,Chung, Myung-Hwa,Jheong, Yeoub,Jheong, Dae-Sik,Kwon, Jong-Won,Yang, Joong-Ik,Min, Shin-Hong 한국약제학회 1988 Journal of Pharmaceutical Investigation Vol.18 No.1
Physicochemical properties of oil in water microemulsions containing soybean oil and egg phosphatide were observed for 3 weeks under the storage condition of $4^{\circ}C$ refrigerator. Changes in major fatty acid content, particle size distribution, rheogram, acid value and pH value were measured by gas chromatograph, laser particle sizer, Coulter counter and rheometer. From above experiments following conclusions were obtained; 1) Mean particle diameter was shifted from 240 to 266mm. 2) No significant changes were observed in the content of major fatty acids of soybean oil, rheogram, acid value and pH value.