IGCC용 고온건식 탈화제의 반응속도 모사에 관한 연구

박소진,이영우,민세홍,나재익,위영호 忠南大學校 産業技術硏究所 1999 산업기술연구논문집 Vol.14 No.1

고온건식 탈황공정에서 탈황제의 황화, 재생 반응은 비촉매 기고 반응이다. 이러한 비촉매 기고 반응의 수학적 모사는 실험데이터의 설명, 공정의 설계 그리고 scale-up에 있어서 매우 중요한 정보가 된다. 탈황제의 황화, 재생 반응에는 spray dryer로 제조된 zinc titanate 탈황제를 사용하였고, 변형된 미반응핵 모델식에 적용하여 각 반응의 반응속도를 해석한 결과 탈황제의 황화반응에는 화학반응 저항과 고체 상태의 확산 저항이 회합하여 전체반응속도를 지배하며, 이때 반응속도상수는 367.67cm/min 이었고 고체상태의 확산계수는 29.66cm²/min이었다. 또한 재생반응시에 는 화학반응 저항만이 전체반응의 저항으로 관여하며, 이때의 반응속도상수는 3.45x10e cm/min이었다. In the dry-type high temprature gas desulfurization process, sulfidation and regeneration reactions of desulfrrization sorbents are noncatalytic gas-solid reactions. The mathematical modeling of noncatalytic gas-solid reactions is improtant in order to interpret laboratory data and in design and scale-up. Zinc titanate sorbent to manufacture by spray dryer is used in sulfidation and regeneration reactions of desulfuization sorbents. The result which analyzes reaction rate of sulfidation reaction by applying each reactions to modified unreacted core model is that the global reaction rate is controlled by associating with chemical reaction resistance and solid state diffusion resistance. In this case,reaction rate constant is367.67e cm/min and solid state diffusion coefficient is 29.66e cm²/min Also gloval reaction rate of regeneration reaction is controlled only by chemical reaction resistance. In this case, reaction rate constant is 3.45x10e cm/min.

악관절 강직의 치험 36예 보고

홍성철,오재욱,김수신,백세민,B.CELLIKOZ 大韓成形外科學會 1990 Archives of Plastic Surgery Vol.17 No.6

Ankylosis of the mandible is a serious and most disabling condition. Impairment of speech, difficulty with mastication, poor oral hygience, facial asymmetiry, and mandibular micrognathia invariably result in much physical and psychologic disability, particularly in young children with complete inability to open the mouth. We performed a one stage reconstruction of temporomandibular joint at the same time as performing multiple additional oateotomies to correct the facial asymmetiry. Temporomandibular joint was reconstructed with costchondral graft or interpositional arthroplasty with silastic implant. Breakdown of 36 cases is as follows. 1. Most prevelent incidence is at age of 21-30 revealed no sex predilection. 2. Trauma was the most common cause, found in 8 patients. 3. Average preoperative mouth opening was 21mm and postroperative mouth opening was 39.8mm 27 patients with interincisor lengh greater than 30mm resumed a satisfactory life style with no discomfort. 4. Anethesia was done by fiberoptic nasotracheal intubation in 31 patients. 5. Postroperative complication included infection in 3 patients which was treated with local and systemic antibiotic therapy. 1 patient developed transient lower lip hypoesthesia.1 patient complained remained facial asymmetiry, which was corrected by fat injection. 6. In 20 patients simultaneous total correction of temporomandibular joint ankylosis and facial asymmetry were done.

배 유과 가공제품의 품질 특성 및 저장 중 생균수 변화

민진홍, 현세희1, 나광출, 이종수, 김하근 배재대학교 자연과학연구소 2012 自然科學論文集 Vol.23 No.1

To develop the functional pear fruitlet product, we prepared dried pear fruitlet and fermented pear fruitlet, respectively. Then we investigated their general characteristics, and viable cell number changes during the storage at room temperature. We also determined preference for their tastes. Dried pear fruitlet contained more ash and crude proteins as well as minerals than fermented pear fruitlet. However fermented pear fruitlet contained higher amount of edible fiber than dried pear fruitlet. Fungi were not detected from dried pear fruitlet during the storage experiment at room temperature. Numbers of bacteria from dried pear fruitlet were increased from 1.1☓105/g at the beginning to2.6☓106/g at the last day of experiment. When we determined change of fungi number during the storage of fermented pear fruitlet, we cannot detect fungi at the beginning but we detected 4.4☓102/g of fungi at the last day of storage experiment. Bacteria from fermented pear fruitlet were detected at around 1.0☓109/g during the storage periods. Preference for fermented pear fruitlet was superior to dried one.

록인 증폭기에 의한 L(C,R) 회로 공진점 결정의 한 방법

정세민,홍진태,최규황,노지현 東亞大學校 附設 基礎科學硏究所 1994 基礎科學硏究論文集 Vol.11 No.1

L(C,R)회로의 공진점을 결정하기 위해 록인 증폭기에 의한 sequential spectrum analysis(SSA)법을 적용해 보았다. 시료는 변압기였으며, 단일 소인방식과 왕복 소인방식을 비교해 보았다. 또한 실험 결과의 신뢰도를 확인해보기 위해 실험결과를 변압기의 제작사 자료와 Q 미터(HP,4277A USA)에 의한 측정 결과와 비교하였다. 제작사 자료에 의하면 시료의 공진점은 두 권선의 각각은 5kHz(10kHz/2)였으나, 왕복소인에 의한 측정에서 시료의 공진점은 5.1kHz, 실험 결과로부터 계산된 Q 값은 4.3으로 주어졌고, 단일 소인법에 의해서는 공진점이 5.78KHz로 주어졌으며, Q 미터에 의한 Q 값은 4.9(9.8/2)였다. 실험 결과들과 기준 Q 미터에 의한 측정결과를 비교해본 결과, 양방향 소인법이 단일 방향소인법 보다 더 신뢰할 수 있음을 알 수 있었으며, SSA법에 의한 측정이 기존의 상용 전문기기에 의한 측정에 못지 않음과 전문기기의 측정 하한 문제를 극복하는 좋은 대안이 될 수 있음을 알 수 있었다. An accurate method named the sequential spectrum analysis(SSA) using a lock-in amplifier(LIA) of the heterodyne type was investigated to determine the resonance frequency of a LC(C,R) circuit : A heavy winding transformer was used as an inductor in the circuit. In this experiment, two types of the sweep method-one way and round trip method were examined. The resonance frequency of each method were compared with the manufacturer's data and those by the reference Q meter(HP,4277A, USA)for the experimental confidence: Measured resonance frequency by the round-trip method was 5.1 kHz, Q value at this frequency was about 4.3, while those by the single-sweep method were given by 5.78 kHz for the resonance frequency, 2.3 for the Q. On the other hand, the resonance frequency of manufacturer's data was 5 kHz and Q value by the reference Q meter was 4.9(9.8/2)at that frequency. From the comparison, it might be concluded that the SSA by the round-trip method was more reliable and accurate than the one-way method and relatively inexpensive, good alternative with respect to the professional instrument.

준 열원의 강도분포에 관한 연구

도시홍,정세민,배세환,성상기,박흥준 釜山水産大學校 1985 釜山水産大學 硏究報告 Vol.25 No.1

실험결과 다음과 같은 결론을 얻을 수 있었다. q=3,q=30일때 최대치의 확율은 각각 0.08, 및 0.029이었다. 이것은 Pearl과 Troup의 결과 (q=1.9106, q=5.6904 및 q=34.7657 일때 최대치의 확율은 각각 0.09, 0.06 및 0.02)와 아주 유사했으며, 관측시간의 증가에 따라 분포의 천이경향도 이론적 결과와 잘 일치 되었다. 또한 준열원에서 방출된 광자들이 공간내의 유한한 영역에서 고르게 분포되어 있을때 그 광원을 coherence time보다도 더 긴 시간동안 관찰한다면 그 관원을 gaussian으로 취급할 수 있으며, 광자에 대한 Bose-Einstein 통계의 적용이 타당함과 Mandel의 근사공식(q>>1, q<<1인 경우)이 잘 성립될 것임을 실험으로 예상할 수 있었다. Light emitted from a source fluctuates both spatially and temporally. The spatial fluctuations are due to the finite size of the source and the spatial incoherence of the photons emitted from various parts of the source. Temporal fluctuation are due to the wide blackbody spectrum emitted by such a source. It is a direct result of the Bose-Einstein statistics obeyed by photons. Actual measurements on the statistical behavior of thermal light are conducted by pseudothermal light source. In the experiment, we examined the probability density f(I) that the intensity I associated with one or pore coherence volumes is between I and I+dI and the deviation for q<1, which is given by G. Bedad et al. The derivation of f(1) for the case of more than one coherence volume has been given in an approximate form by Mandel and by Troup. As a result, we obtain p(n,T)=0.08 at q=3 and p(n,T)=0.029 at q=30. These are very similar to pearl and Troup's [p(n,T)=0.09 at q=1.9106, p(n,T)=0.06 at q=5. 690, p(n,T)=0.02 at q=34.7657]. So we can conclude that when we observerse pseudo-thermal source for a long time (compared with its coherent time), the source can be treated as a gaussian light source and Mandel's approximation is good fit for photon counting.

경기도 용인시(경희대학교) 주변지역의 지하수 오염현황

오종민,김홍석,진현오,윤세철 경희대학교 환경연구소 1998 環境硏究 論文集 Vol.8 No.-

Recently, the concern about groundwater pollution is increasing. And, groundwater was one of the major water resource used as drinking water by eighty percent of the world population, and its utility as industry water, agriculture water, fresh water was increasing. But, when pollution material was found in housing well, by purifying polluted water, the area of doing thorough conservation management was few. Thus, if water resource being regard as unlimited source, the right view of nature and scientific utility were essential because of the problem of its value. The purpose of this study was that investigated groundwater quality pollution condition in the part areas of Kyunggi-do Suwon Si, Yong-In Si, proposed to efficient management plan for pollution occurrence prevention and groundwater quality development by surveying groundwater pollution source. The result of the study was that the groundwater by use purpose could systematically manage water quality since development beginning, management system about groundwater development with use can established.

한강변 응급센터에 내원한 익수환자에 대한 임상적 고찰

양진홍,박규남,최승필,김영민,김세경 대한응급의학회 2001 대한응급의학회지 Vol.12 No.2

Background: There are approximately 2,400 drowning deaths reported every year in Korea, but there are few good reports about submerged patients visiting the emergency room, so this study was designed to investigate the clinical characteristics and outcomes of submerged patients treated at an emergency medical center near the Han river. Methods: A retrospective review of 123 cases of submerged patients admitted to our emergency medical center over a 5 year period from 1996 to 2000 was conducted. Results: Among the 123 submerged patients, there were 66 males and 57 females, and their mean age was 33.18. The common cause of submersions was a suicide attempt, followed by lack of attention, unknown etiology, and water sports such as swimming. Most of the patients were transported to ER by 119 ambulance. In-hospital CPR was performed on 27(22%) cases. At initial ECG rhythm of these cases, asystole was noted if 25 patients; VF and pulseless electrical activity, respectively, were noted in two others. Prehospital CPR had been performed on all in-hospital CPR cases except 2. Prolonged ROSC after succesful CPR was noted in 13 cases, The mean duration of CPR was 26 minutes. Five patients survived after CPR. Their neurologic outcomes were assessed on CPC(cerebral performance category). Three patients were categorized in CPC1, the other two patients were categorized in CPC3 and CPC4. Conclusion: Submerged patient's visits to emergency medical center near the Han river were most frequent in summer for suicide purposes. Drowned patients were more hypothermic than other cardiac arrest cases, and resulted in better outcome even with prolonged arrest time, if they were given appropriate prehospital CPR and aggreissive in-hospital resuscitation.

관상동맥 시술 도중 발생한 좌주간부 관상동맥 박리에 대한 스텐트 삽입 치료의 단장기 임상 결과 : acute and long-term results

이세환,이승환,홍명기,김영학,이철환,한기훈,송종민,강덕현,송재관,김재중,박성욱,박승정 대한내과학회 2004 대한내과학회지 Vol.66 No.6

목적 : 심도자 사용 시술과 관련된 좌주간부 관상동맥박리에 대한 적절한 치료는 아직 확실히 정립되지 않은 상태이다. 이에 본 연구는 좌주간부 관상동맥 박리에 대한 스텐트 삽입술의 단장기 임상결과를 후향적으로 분석하였다. 방법 : 좌주간부 관상동맥 박리에 대한 치료로 즉각적인 스텐트 삽입술을 시행하는 것이 안전하고 효과적인 방법임을 가설하였고, 이러한 즉각적인 스텐트 삽입을 시행한 10명의 환자를 대상으로 단장기적 임상경과를 의무기록 고찰과 전화 면담을 통해서 평가하였다. 결과 : 전체 환자 모두 처음부터 좌주간부 관상동맥에 유의한 협착을 가진 환자는 없었으며, 8명의 환자는 심도자의 조작으로 인한 박리가 발생한 경우였고(진단적 혈관 조영술 중에 3명, 유도 도자 조작 중에 5명), 나머지 2명은 다른 병변에 스텐트 삽입시술을 하는 중에 박리가 발생하였다. 이 10명의 환자에서 모두 즉각적인 스텐트 삽입술이 시행되었고, 4명의 환자에서 시술 도중 혈압 저하로 Intra-aortic Ballon Pump (IABP)를 장착하였다. 모든 환자에서 성공적으로 스텐트가 삽입되었고, 병원내 사망은 1명도 없었다. 6개월 추적 관상동맥 조영술은 8명의 환자에서 시행되었다. 혈관 조영상의 재협착(직경 협착 50% 이상)은 8명 모두에게서 관찰되지 않았으며, 퇴원 후 평균 31±25개월의 추적관찰 결과 주요 심장사건은 1건도 발생하지 않았다. 결론 : 비록 대상 환자가 적은 연구였지만 좌주간부 관상동맥 박리에 대한 스텐트 삽입술은 기술적으로 안전하고 빠르게 시행 할 수 있으며, 훌륭한 단장기적인 치료 효과를 보여준다. Background : The optimal treatment of patients with left main coronary artery (LMCA) dissection during catheter-based procedure remains uncertain. We retrospectively analyzed the acute and long-term results of bail-out stenting for LMCA dissection. Methods : In cases with significant LMCA dissection occurring during catheter-based procedure, prompt stent implantation may be safe and associated with favorable clinical outcome. We evaluated the acute and long-term results of bail-out stenting for LMCA dissection occurring during catheter-bases procedure in 1- patients. Results : Initially, there was significant stenosis of LMCA segment in these patients. Catheter-induced dissection occurred in 8 patients (during diagnostic angiography in 3 patients and guiding catheter manipulation in 5 patients). Two patients suffered dissection in the setting of stent deployment in other vessels. Therefore, bail-out stenting LMCA dissection was performed in a total of 10 patients. In 4 patients, hypotension developed and intra-aortic balloon pump was placed during procedure. Stents were successfully deployed in all patients. There was no in-hospital mortality. Six-month angiographic follow-up was performed in 8 patients. Angiographic restenosis(diameter stenosis 50%) was not observed in all patients at follow-up study. During a mean follow-up of 31±25 months after hospital discharge, there was no major adverse cardiac event (death, myocardial infarction, and target lesion revascularization). Conclusion : Bail-out LMCA stenting is technically feasible, and showed good acute and long-term results in a small series of patients.

중형,중고 Thyratron 4C35A의 동작 특성

정세민,홍진태 東亞大學校附設基礎科學硏究所 1995 基礎科學硏究論文集 Vol.12 No.1

Some operational conditions and characteristics of an old, medium-sized thyratron, ITT4C35A, were investigated by the measurements on the static breakdown voltage, AC and DC I-V relationship. For the case of our 4C35A tube, the minimum static breakdown voltage was 2 kV according to its minimum anode voltage. But above this minimum anode voltage, there were considerable deviations of the breakdown voltage of grid from 2 kV to 350-480 V when grid input voltage was swept fast. On the contrary, there were not any breakdown phenomena below 350 V, independent of anode voltage. From those results, it turned out that the breakdown voltage for the quasi-static case was more than 2 kV and capacity of the power supply was sufficiently high for the glow-arc transition and the grid input was more than 350 V for the dynamic condition, and that the tube type was a positive grid thyration, although it might be used with negative grid input. Also, it might be concluded that nonlinearity and current controlled negative resistance(CCNR) were initiated from variations of the charge distribution and the operational characteristics of the tube was very similar to the rectifier.

견갑부 유리피판술 : ITS ANATOMY & CLINICAL APPLICATIONS 해부학적 구조 및 임상적 고찰

김홍래,백세민,이혜영 大韓成形外科學會 1983 Archives of Plastic Surgery Vol.10 No.2

Since the first successful microvascular free flap was performed by Daniel & Taylor in 1973, it has been popularized in the plastic and reconstructive surgery. The free skin flap has proved its great versatility as compared with conventional pedicle flap methods. It can be applied to extensive skin defects and one-stage pedicle flap procedure, and hospital stay is shorter. Early ambulation and rehabilitaion are possible. In 1980, Frenklin reported on the use of deltoid free flap, which was based on posterior circumflex humeral vessel. The flap has relatively thin subcutaneous tissue, but has thicker dermal layer, so provides stability to the sole and heel of foot. Anatomically the plane of dissection is easily identified. The donor scar is minimal, and functionally and cosmetically acceptable. Authors have good result using deltoid free flap for reconstruction of shallow tissue defects.