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정상인 20 대 남자에서 Holter 심전도를 이용한 부정맥에 관한 연구
윤봉영(Bong Young Yoon),이정미(Jung Mee Lee),김영조(Young Jo Kim),심봉섭(Bong Sup Shim),이현우(Hyun Woo Lee) 대한내과학회 1991 대한내과학회지 Vol.41 No.4
N/A A 24-hour Holter EK(i was monitored, during ordinary activities, on 51 medical students and interns without heart or other systemic diseases in order to compare the difference of arrythmia between waking and sleeping hours. During waking hours, the mean, maximal and minimal heart rates were 85.8±7.2/min, 144.9±14.2/min, and 52.0±5.9/min, respectively; during sleeping hours, they were 65.2±9.6/min, 128.5±11.6/min, and 47.1±7.3/min. During sleep the mean heart rate was found to be significantly slow. Sinus arrythmia was noted in all subjects without a difference in sleeping and waking periods, and no sinus pause (more than 2.0 seconds) was noted. Twenty subjects (39.2%) showed supraventricular premature beat. Arrythmia was noted in 15 subjects (75%) during waking, 2subjects (10%) during sleeping, and 3subjects (15%) during both waking and sleeping hours. Ventricular premature beat was noted in 13subjects (25.5%), and this arrythmia was noted in 12subjects (92.3%) during waking and 1 subject (7.7%) during sleeping hours. No case developed VPB`s during the sleeping period alone. Atrioventricular conduction defect was noted in 5subjects (9.8%), and all were noted during the sleeping period. Among them Morbitz type I (Wenckebach block) A-V block was noted in 4subjects (80%) and first-degree A-V block in 1 subject (20%).
홍봉영(Hong Bong Young),김강정(Kim Kang Jung) 한국산업경영학회 2004 경영연구 Vol.19 No.1
본 연구는 Generalized Malmquist 생산성지수를 이용하여 1997년 외환위기 때부터 2001년까지 국내은행의 생산성변화를 순수기술효율성, 규모효율성 및 기술변화로 구분하여 측정하며, 기술변화는 기술변화의 폭(MGNI)와 평가대상 DMU가 기업환경 변화에 대한 적응도를 평가할 수 있는 바이어스(BIAS)의 변화로 분리하여 측정하였다. 우리나라 은행산업의 효율성은 생산성은 1997년 외환위기 당시의 수준보다 낮은 것으로 나타났지만, 이것은 선도은행의 효율적 프론티어의 상승으로부터 기인되었으며 , 동시에 생산성은 기술변화로 인한 효율적 프론티어의 상승으로 인하여 1999년부터 계속적으로 증가하고 있는 것으로 나타났다. 그리고 외형위주의 경영에서 탈 피하고 있으며, 특히 기술변화에서 MGNI는 BIAS의 하락 부분을 상쇄하고 기술진보에 영향을 준 것으로 확인되었다. The primary objective of this study is to examine the changes in productivity of Korean banking industry after the financial crisis in 1997 by Data Envelopment Analysis. Generalized Malmquist indices will be decomposed into four components such as pure efficiency change, scale efficiency change, magnitude of technical change and bias of technical change. This study finds the overall rise in productivity driven more by the magnitude of technical change than the bias of technical change.
김봉영(Bong-Young Kim),송욱진(Uk-Jin Song),배명진(Myung-Jin Bae) 인문사회과학기술융합학회 2018 예술인문사회융합멀티미디어논문지 Vol.8 No.10
급격한 산업발달은 화학에너지를 고갈시키고, 지구온난화를 심화시키고 있다. 풍력발전기는 자연친화적인 신재생에너지로써 주목을 받고 있다. 그러나 풍력발전기의 가동시 발생하는 소음으로 인해 인근 주민들의 민원이 끊이지 않고 있다. 풍력발전기 소음은 일반 생활소음과 다르게 매우 낮은 저주파 소음과 충격소음의 특성을 가지고 있다. 그러나 풍력발전기 소음에 대한 허용기준조차 없이 일반 환경소음 기준만을 적용하고 있는 실정이다.본 논문에서는 소리전달경로를 고려하여 풍력발전기 소음이 어떠한 특성으로 전파되는지 확인하였다. 실험결과 일반 생활소음이 800m를 전파하여 측정위치보다 소음레벨이 32dB가 감소하였던 반면, 풍력발전기 소음은 2000m를 전파해야 측정위치보다 소음레벨이 32dB 감소하는 것을 확인하였다. 또한, 풍력발전기 소음은 저주파성분의 충격소음도 함께 멀리까지 전파되었으며, 저주파성분만 집중적으로 남아 전파함으로써 매우 답답함을 느끼게 하는 것을 확인하였다 Rapid industrial development is depleting chemical energy and deepening global warming. The wind power plant is attracting attention as a nature-friendly renewable energy. However, due to the noise generated during the operation of the wind power plant, the complaints of nearby residents are still continuing. The noise of the wind power plant is characterized by very low low-frequency noise and impact noise, unlike ordinary living noise. However, there is no acceptance criterion for wind power plant noise. Only the general environmental noise standard is applied to wind power plant. In this paper, the characteristics of wind power plant noise are analyzed by considering the sound propagation pathways. Experimental results show that the noise level is reduced by 32dB from the measured position when the ordinary living noise propagates 800m. On the other hand, it is confirmed that the noise level is reduced by 32dB from the measured position when the wind power plant noise propagates at 2000m. In addition, the noise of the wind power plant propagated far away along with the impact noise of the low frequency components, and it was found that only the low frequency components were intensively remained so that the wind power plant noise was very uncomfortable.
김봉영(Bong-Young Kim),배명진(Myung-Jin Bae) 인문사회과학기술융합학회 2018 예술인문사회융합멀티미디어논문지 Vol.8 No.7
수박과 통조림은 내부용량과 내부압력의 상태에 따라 미세하게 다른 소리가 난다. 숙달된 검사원은 제품의 미세한 소리차이를 인지하여 제품의 상태를 파악한다. 제품의 내부 압력이 변하게 되면 제품표면을 기준으로 음향임피던스의 불균형이 발생한다. 또한, 음향임피던스의 불균형은 밀폐용기의 진동을 방해하게 된다. 본 논문에서는 밀폐된 용기의 진공실험을 통해 변화된 압력에 따라 나타나는 소리특성 변화를 확인코자 한다. 실험결과 외부와 내부의 압력차가 없는 경우에 용기가 250, 563, 906, 1219Hz에서 공명하는 반면 내부 압력을 낮춘 0.8bar의 진공도에서는 188, 281, 563, 1250Hz로 공명하여, 공명주파수 Shift 현상을 확인하였다. 또한, 각 압력상태에 따라 공명주파수의 에너지 분포도 및 분산을 확인한 결과 진공도가 높을수록 공명주파수별 에너지 크기가 균일해지는 것을 확인할 수 있었다. 이러한 실험결과로 압력의 변화에 따라 소리가 다르게 나타나는 정도의 상관관계를 확인하였다. The watermelon and the canned goods sound differently depending on the internal capacity and the internal pressure. The skilled inspectors recognize the fine sound difference of the product and understand the state of the product. If the internal pressure of the product changes, an unbalance of the acoustic impedance occurs on the product surface. In addition, the unbalance of the acoustic impedance suppresses the vibration of the closed container. In this paper, we investigate the change of the sound characteristics according to the changed pressure through the vacuum experiment of the closed container. The experimental results show that the vessel resonates at 250, 563, 906, and 1219 Hz when there is no external and internal pressure difference, while it resonates at 188, 281, 563, and 1250 Hz at the vacuum of 0.8 bar, As a result, resonance frequency shift phenomenon was confirmed. Also, the energy distribution and variance of the resonance frequency were checked according to each pressure condition, and it was confirmed that the energy level per resonance frequency was much more similar to the degree of vacuum. As a result of these experiments, we confirmed the correlation between the change of pressure and the sound appearing differently.
다이아몬드 와이어에 의해 절단된 다결정 실리콘 태양전지의 나노텍스쳐링 및 후속 식각 연구
김명현(Myeong-Hyun Kim),송재원(Jae-Won Song),남윤호(Yoon-Ho Nam),김동형(Dong-Hyung Kim),유시영(Si-Young Yu),문환균(Hwan-Gyun Moon),유봉영(Bong-Young Yoo),이정호(Jung-Ho Lee) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.3
The effects of nanotexturing and post-etching on the reflection and quantum efficiency properties of diamond wire sawn (DWS) multicrystalline silicon (mc-Si) solar cell have been investigated. The chemical solutions, which are acidic etching solution (HF-HNO₃), metal assisted chemical etching (MAC etch) solutions (AgNO₃-HF-DI, HF-H₂O₂-DI) and post-etching solution (diluted KOH at 80℃), were used for micro- and nano-texturing at the surface of diamond wire sawn (DWS) mc-Si wafer. Experiments were performed with various post-etching time conditions in order to determine the optimized etching condition for solar cell. The reflectance of mc-Si wafer texturing with acidic etching solution showed a very high reflectance value of about 30% (w/o anti-reflection coating), which indicates the insufficient light absorption for solar cell. The formation of nano-texture on the surface of mc-Si contributed to the enhancement of light absorption. Also, post-etching time condition of 240 s was found adequate to the nano-texturing of mc-Si due to its high external quantum efficiency of about 30% at short wavelengths and high short circuit current density (Jsc) of 35.4 A/cm².