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대기압 유전체배리어 방전으로 표면처리된 TiO<sub>2</sub> 분말의 광분해 특성
강정아,김윤기,Kang, Jeong A,Kim, Yoon Kee 한국재료학회 2016 한국재료학회지 Vol.26 No.8
In order to reuse the photocatalyst and enhance the photolysis efficiency, we have used atmospheric pressure dielectric barrier discharge (APDBD) to clean and activate $TiO_2$ powder. The photocatalytic activity of the $TiO_2$ powder before and after APDBD treatment was evaluated by the degradation of methylene blue (MB) in aqueous solution. The apparent reaction rate constant of photolysis of the first sample of reused $TiO_2$ cleaned by APDBD improved to a level up to 0.32h-1 higher than the 30 % value of the initial $TiO_2$ powder. As the number of photolysis reactions and APDBD cleanings increased, the apparent rate constants gradually decreased; however, the fourth photolysis reaction still showed a value that was greater than 10% of the initial value. In addition, APDBD treatment enhanced the process by which $TiO_2$ effectively adsorbed MB at every photolysis stage.
축사의 초기 설계를 위한 가변형 에너지 모델 생성 툴 개발 및 변수별 에너지 분석
강정아(Kang, Jeong-A),신학종(Shin, Hak-Jong),곽영훈(Kwak, Young-Hoon),허정호(Huh, Jung-Ho) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.1
In the case of pig house, animals react sensitively to the indoor heat environment, so appropriate air conditioning control is required to secure productivity. Accordingly, there is a growing interest in analyzing the possibility of energy reduction in pig house using an energy model. However, in the case of the Whole building energy model, which enables precise energy analysis, it is difficult for non-experts to use it, especially in pig house where construction is often performed without the participation of a building engineer. In the case of a pig house, compared to a general building, it is possible to analyze the energy using the Whole building energy model by setting a simple input variable because it has a relatively simple building type and similar internal environmental conditions for each house. In this study, we developed a tool that can analyze the energy demand of a pig house by changing the design parameters only by inputting a few numerical values without a separate 3D modeling. If this is used, it is considered that the possibility of energy reduction according to the design conditions can be analyzed during the initial design stage of the pig house.
스마트 축사에서의 실효적인 암모니아 모니터링을 위한 센서사양 및 유지관리 기준 제안
강정아(Kang Jeong-A),배재영(Bae Jae-Young),곽영훈(Kwak Young-Hoon),신학종(Shin Hak-jong),문선혜(Mun Sun-Hye),허정호(Huh Jung-Ho) 한국태양에너지학회 2022 한국태양에너지학회 논문집 Vol.42 No.6
To implement smart livestock operations based on information and communication technology, a field monitoring environment based on measured data must be established. Ammonia should be managed more carefully than other environmental monitoring items because it is related to the comfort and production of livestock. Moreover, it is related to odor complaints and environmental protection issues. However, existing studies that propose ammonia measurement standards for each purpose differ from one another or are unclear, and ammonia sensors in the actual field have problems such as durability and management constraints; nonetheless, there is a lack of research on these aspects. Accordingly, for effective ammonia monitoring of smart livestock operations, the necessity of ammonia monitoring for smart livestock operations is first presented, after which a plan for ammonia monitoring of smart livestock operations, supplemented with sensor specifications and maintenance standards, is proposed. This study presents a clear measurement standard based on a comprehensive literature review, as well as an effective monitoring standard reflecting field operation information. This can lead to reliable ammonia data collection and can be a starting point for smooth smart livestock operation.
강정아(Jeong A Kang),이유선(Yeu Seon Lee),정승현(Seung Hyeon Jeong),이정우(Jeong Woo Lee),김보영(Bo Yeong Kim),임대승(Dea Seung Im),이민수(Min Soo Lee),김정희(Jeong Hee Kim),정준용(Jun Young Jeong),최시완(Si Wan Choi),정진옥(Jin Ok J 대한내과학회 2002 대한내과학회지 Vol.63 No.2
Background: Coronary artery spasm plays an important role in the pathogenesis of variant angina. However the precise mechanism (s) and the clinical characteristics of variant angina remain to be elucidated. We investigated the clinical characteristics and diagnostic features of variant angina. Methods: The clinical characteristics and coronary angiographic findings were analyzed in 178 patients with angiographically documented coronary artery spasm, which developed spontaneously or was provoked by the admistration of intravenous ergonovine maleate. All patients were followed for at least 1 year or more or until their death. Results: One hundred and eleven patients complained of chest pain which developed especially at night and in the early morning. One hundred and thirty three patients (74.7%) were smokers. The electrocardiographic findings at the time of admission showed no changes in 147 cases (82.6%), testes showed ST segment elevation in 22 cases (12.4%), ST segment depression in 2 cases (1.1%), T wave inversion in 7cases (3.9%). The treadmill test was performed in 135 cases, ST segment elevation was noted in 6 patients (4.4%) and ST segment depression in 18 patients (13.3%). All of the other results were within normal range. The ergonovine provovative tests for coronary spasms were safe and effective. The right coronary artery was the most prevalent site of coronary artery spasm. Drug treatment was applied initially to all patients, but only 115 patients (64.5%) received the follow-up. Of these three died from cardiac arrest. The rate of cardiac death was low (1.7%) in patient, which made it difficult to know the risk factors for the cardiac deaths. Two (1.1%) had cardiac arrest. They didn't take any medication. Patients with variant angina usually responded well to nitrates and calcium antagonists. Thus nitrates and calcium antagonists are useful in preventing attacks and abolished attacks of variant angina. Conclusion: In this study, 13.2% of coronary artery disease was variant angina. The effectiveness of drug therapy and the prognosis of the patients was quite good in the group. But when chest pain happens, the adequate use of nitrate agents is needed because of cardia arrest or cardiac death in 2.8% of the patients. (Korean J Med 63:195-202, 2002)