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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.
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
목적: 우리나라는 이형성 협심증의 발생 빈도가 높음에도 불구하고 임상상과 예후에 대한 연구가 부족한 실정이다. 이에 본 조사는 이형성 협심증으로 진단을 받은 환자를 대상으로 그 빈도와 임상상 그리고 예후에 대해 연구 조사하였다. 방법: 1995년 1월부터 2000년 7월까지 흉통을 주소로 충남대학교병원 순환기 내과에 입원하여 관상동맥 조영술를 시행한 결과 관상동맥의 내경의 협착이 50% 미만이며 에르고노빈(ergonovine)8, 9) 유발 검사로 이형성 협심증으로 진단된 178명을 대상으로 하였다. 결과: 1) 관상동맥질환자 중 이형성 협심증 환자의 빈도는 13.2%로 높았다 2) 이형성 협심증의 위험인자는 흡연이 가장 많았다. 3) 이형성 협심증의 임상상은 대부분 불안정형 협심증의 양상이었고, 13.2%의 환자는 급성심근경색의 임상상을 보였다. 4) 흉통의 발생 시간대는 대부분 새벽이었고, 흉통의 지속시간 평균 11분으로 일반 협심증보다 길었다. 5) 흉통이 없을 때 검사한 심전도는 대부분에서 정상이었고, 운동부하 심전도검사는 76%에서 음성소견을 보였다. 6) 이형성 협심증의 진단에 에르고노빈 유발 관상동맥 조영술은 안전하고 유용한 검사이다. 7) 이형성 협심증의 치료에 칼슘길항제와 나이트레이트제제는 효과적인 약물이다. 8) 이형성 협심증의 예후는 비교적 양호하나 임의로 약물이 중단된 상태에서 심장사 할 수 있다. 따라서 이형성 협심증 환자는 흉통 발생에 대비한 나이트레이트의 준비가 필요하다. 결론: 본 조사에서는 관상동맥질환자의 13.2%가 이형성 협심증 환자였고, 이들은 약물 치료에 대한 효과와 예후가 비교적 양호하였다. 그러나 2.8%의 환자에서 심정지나 심장사가 발생하여 흉통 발생시에 적절한 나이트레이트제제의 사용이 필요하겠다. 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)
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.
강정아(Jeong A Kang),문선혜(Sun Hye Mun),곽영훈(Young Hoon Kwak),허정호(Jung Ho Huh) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
The importance of a pleasant environment is increasing due to the increase in occupancy time of residential buildings, and the energy performance of buildings required by the government is also increasing. Residents behavior is a factor that has a considerable influence on building energy, and although there is high uncertainty, it can act as an advantage in reducing building energy. This uncertainty of resident behavior can be caused by the fact that residential buildings do not have standardized behavior patterns unlike business buildings. The purpose of this study is to classify the behavioral patterns of non-standardized residential buildings into similar patterns by using the clustering technique during machine learning, and also to analyze the characteristic conditions according to the classified patterns. It is believed that the methodology and results used can be effectively used for predicting behavioral patterns and energy according to conditions that will occur in buildings in the future. Behavior data clustering was performed based on the occupancy behavior data of residential buildings measured for 20 days in the intermediate period. Among the machine learning algorithms, K-means Time Series Clustering was used, and the characteristics of each cluster were analyzed according to the classification properties.
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.