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돈분뇨 처리과정에서 발생되는 알데히드 화합물의 발생특성
이창원,이은영,유재홍 한국냄새환경학회 2012 실내환경 및 냄새 학회지 Vol.11 No.4
돈사에서 배출되는 돈분뇨에서는 다양한 악취화합물이 함유되어있다. 돈분 악취를 저감하는 가장 보편적인 방법은 사료에 사료 보조제를 첨가하는 것이다. 그러나, 그 첨가 효과에 대해서는 다양한 의견이 있다. 본 연구에서는사료 보조제를 첨가한 실험군과 첨가하지 않은 대조군에서 발생되는 알데히드 화합물의 발생특성을 비교하였다. 인큐베이터형의 돈사에 여섯 구획이 나뉘어져 생후 26~28일된 60두의 자돈을 10두씩 넣고 사양실험을 하였다. 5종류의 사료 보조제는 유통 중이거나 개발중인 것을 이용하였다. 각 실험군의 돈분을 넣은 후 악취발생기에서발생된 가스를 headspace로부터 채취하여 GC로 분석하였다. 각 알데히드 화합물의 측정 농도를 최소감지농도로 나누어 주요 악취물질을 추정하였다. 분석 결과 6종류의 알데히드 화합물 (acetaldehyde, propionaldehyde, isobutyraldehyde, n-butyraldehyde, i-valeraldehyde, n-valeraldehyde) 중 95.3%를 차지하는 물질은isobutyraldehyde이었다. 또한, 알데히드 화합물은 황화합물과 트리메틸아민의 저감과 통계적으로 깊은 상관관계를 갖는다 Swine manure discharged from pigery emits various odorous compounds. The most common method to reduce such odors is adding feed additives to swine feeds. However, whether the effects of such methods are truly effective are controversial. This research contrasts the aldehyde compound emission characteristics and removal effects from a treatment group, which were given feeds added with feed additives, to a control group, which were given feeds without feed additives. Sixty swine of age 26~28 days were evenly divided into six sections within an incubator type pigsty - each section contained ten weaners. Five types of feed additives, either currently in the market or in development were supplied. Gases sampled from the headspace in the odor producing reactor were analyzed by GC. Major malodorous compounds were estimated by the concentrations and threshold values from the detected components. Since 95.3% of the odor comes from isobutyraldehyde out of six types of aldehyde compounds (acetaldehyde, propionaldehyde, isobutyraldehyde, n-butyraldehyde, i-valeraldehyde, n-valeraldehyde), it can be regarded as the most critical compound contributing to pigsty odor. Aldehyde compounds showed statistically significant correlation with elimination of sulfide compounds and trimethylamine
FEM 과 MOM 을 결합한 방법을 이용한 2 차원 반사기 형태 안테나의 해석
이창원,손현,김중표,채은경 경북대학교 전자기술연구소 2000 電子技術硏究誌 Vol.21 No.1
The radiation characteristics of the two-dimensional reflector-type antenna is numerically analyzed using a combined FEM/MOM algorithm. The antenna has a structure of the infinite flanged parallel-plate waveguide with a cavity excited by an input TEM mode. With the use of equivalent currents, the fields in the exterior regions are formulated using the method of moment (MOM), in the interior region are computed using the finite element method (FEM). The radiation patterns and reflection coefficients are determined for different reflector shape, position, size, and number.
이창원,김채영,최동묵 경북대학교 전자기술연구소 2001 電子技術硏究誌 Vol.22 No.2
The closed form expression of the magnetic flux density due to a plate loop current is derived under the assumption of the static field. Inductance of the plate loop antenna for a pager application is calculated by integrating the magnetic flux density which is an analytic function of the space over the area of the plate loop antenna. The results show that the error between the calculated and measured values is within 10%.
이창원,조규종,송근정,김준수 대한응급의학회 2011 大韓應急醫學會誌 Vol.22 No.3
Early defibrillation with an automated external defibrillator (AED) is crucial to survival success in sudden cardiac arrest. Dissemination of public-access AEDs have increased the frequency of early defibrillations and contributed to improved outcomes after out-of-hospital cardiac arrests (OHCAs). However, public-access AEDs are not yet widely-disseminated in Korea. We report the first survival case of an OHCA patient who received shocks from a public-access AED in Korea.
A Study on Fintech(Financial Technology) and E-Business : State of the Art
이창원 한국인터넷전자상거래학회 2015 인터넷전자상거래연구 Vol.15 No.5
This study is to present a state of the art in Financial Technology(Fintech) and the current application of Fintech in e-business sectors. The new technology and business ecosystems are rapidly changed in Fintech. If any organizations doesn't have a proper value proposition and core competency, they will face in failure in their business worlds. As economic entities of business systems, Fintech systems face the issues of planning, operating, and evaluating its current technological resource based decisions. In this global ecosystems, new financial innovation with technology is now a core business agenda. Since no previous academic study on Fitech has been published, a comprehensive Fintech study in terms of technology and e-business perspective is highly required to build up a theoretical frameworks and practical case analyses. This study is to 1) explore key definitions and characteristics in Fintech, 2) review comprehensive relevant studies of Fintech, and 3) analyze case studies related Fintech and e-Business experiences. The study shows show important managerial viewpoints on current and future Fintech ecosystems. This study provides the managerial insights for comprehensive framework in Fintech and e-Business in theories and practices.