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최석호,김대연,박귀원,정성은,이성철,김우기,장자준,Choi, Seok-Ho,Kim, Dae-Yeon,Park, Kwi-Won,Jung, Sung-Eun,Lee, Seong-Cheol,Kim, Woo-Ki,Jang, Ja-Jun 대한소아외과학회 1998 소아외과 Vol.4 No.1
Six children with solid and papillary epithelial neoplasm of the pancreas were studied retrospectively. There were 2 boys and 4 girls. The mean age at operation was 11 years(range; 8-13years). Three patients had incidental abdominal mass, in two patients the mass was non-tender, in one patient the mass was tender. The minimum size of tumor was $6.5{\times}6.0$ cm and the maximum was $10.5{\times}8.0$ cm. Five tumors were located in the head of the pancreas, and the other one in the tail. Local invasion or metastasis was not noticed. Tumors were removed completely by performing the following operations: 3 pylorous preserving pancreaticoduodenectomy, 2 Whipple's operation and 1 distal pancreatectomy. There was no mortality. The histologic findings were characteristic. There were no recurrences during a follow-up of 0.5 to 12 years (mean; 5.0 years).
최석호 ( Seok Ho Choi ),서길준 ( Gil Joon Suh ),김영철 ( Yeong Cheol Kim ),권운용 ( Woon Yong Kwon ),한국남 ( Kook Nam Han ),이경학 ( Kyoung Hak Lee ),이수언 ( Soo Eon Lee ),고승제 ( Seung Je Go ) 대한외상학회 2012 大韓外傷學會誌 Vol.25 No.4
Purpose: Hemorrhage is a main cause of death in trauma patients. The goal of this study is to describe the characteristics of trauma patients with massive bleeding and to evaluate the prognostic factors concerning their survival. Methods: This study was performed retrospectively and included trauma patients with massive bleeding who had been treated from March 2007 to August 2012. The inclusion criterion was patients who received more than 10 U of packed red blood cells within the first 24 hours after visiting the emergency department. Based on their medical records, we collected data in terms of demographic findings, mechanisms of injury, initial clinical and laboratory findings, methods for hemostasis (emergency surgery and/or angioembolization), transfusion, injury severity score (ISS), revised trauma score (RTS) and trauma and injury severity score (TRISS). We used the Mann-Whitney U test and Fisher`s exact test to compare the variables between the patients that survived and those that did not. We performed a logistic regression analysis with the significant variables from the univariate test. Results: Thirty-two(32) patients were enrolled. The main mechanisms of injury were falls and motor vehicle accidents. The mean transfusion amount of packed red blood cells (PRBC) was 17.4 U. The mean elapsed time for the first hemostasis (surgery or embolization) was 3.5 hours. The initial technical success rates were 83.3%(15/18) in angioembolization and 66.7%(8/12) in surgery. The overall mortality rate was 34.4%(11/32). The causes of death were bleeding, brain swelling and multiple organ failure. The ISS(25.5 vs 46.3, p=0.000), TRISS(73.6 vs 45.1, p=0.034) and base excess(<-12 mmol/L, p=0.020) were significantly different between the patients who survived and those who did not. Conclusion: The ISS was a prognostic factor for trauma patients with massive bleeding. (J Trauma Inj 2012;25:247-253)
최석호(Seok-Ho Choi),오세기(Sai-Kee Oh),김현종(Hyun-Jong Kim),진근호(Geun-Ho Jin),오시영(Si-Young Oh),김병순(Byung-Soon Kim) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.11
The aerodynamic and aeroacoustic performance of discharge grille of outdoor unit of air-conditioner was investigated in this study. Discharge grille is one of outdoor unit’s important parts to affect the flow rate and Overall Sound Pressure Level(OSPL). New type of discharge grille was suggested based on the results of numerical simulation. To simulate the flow pattern near the propeller fan, commercial flow solver FLUENT was used. Sliding mesh method was used for rotating propeller fan and initial condition for unsteady model was calculated by Multiple Reference Frame(MRF) method. To minimize the interaction noise between fan blade wake and discharge grille, new discharge grille has radial rib which is aligned with trailing edge of fan blade. And inclined radial rib was adopted for reducing flow rate drop in discharge grille. The optimization of inclined angle of radial grille was performed experimentally.
최석호(Seok Ho Choi),김곤호(Gon-Ho Kim),안강호(Kang-Ho Ahn) 한국진공학회(ASCT) 1998 Applied Science and Convergence Technology Vol.7 No.3
공정 플라즈마내에서 입자의 거동은 하전되는 입자의 극성과 하전량에 따르게 된다. 따라서 본 연구에서는 플라즈마내에서 입자의 거동을 이해하기 위한 기초 작업으로 입자의 하전 특성을 측정하였다. 본 연구에 사용된 단분산 입자는 직경 0.05 ㎛, 0.07 ㎛, 0.1 ㎛, 0.2 ㎛으로 이들 입자를 DC-공기 플라즈마내에 주입하여 이들의 하전량과 하전 극성 변화를 Faraday Cup을 이용하여 측정하였다. 본 실험에서 입자의 하전량과 하전 극성은 주입 입자의 크기와 농도 및 플라즈마 발생조건 즉, 반응 압력, 전압 등에 영향을 받음을 알 수 있었으며 입자 당 10³~10^5 의 평균 하전 수를 갖음이 관찰되었다. Since the particles are highly charged in process plasmas, the dynamics of the particles are concerned principally with the effect of the charging amount and polarity. In order to investigate the charging effect of the particles in the plasmas, the known sizes of the mono-dispersed particles with 0.05 ㎛, 0.07 ㎛, 0.1 ㎛ and 0.2 ㎛ diameter are introduced into the DC air-plasmas. The characteristics of the charged particles are measured with a Faraday cup. Results show that the particle charging polarity depends on the concentrations and sizes of the particles and the condition of plasma generation, operating pressure, and power. It is also found that the number of charges per a particle is in the ranges of 10³~10^5.
최석호(Seok-Ho Choi),백민수(Min-Su Paek),문길호(Kil-Ho Moon) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
In butterfly control valve, a multi-hole orifice is attached downstream of valve to stabilize flow fluctuation. The computational simulation is conducted to analyze valve flow characteristics. The results show that the velocity distribution of downstream of valve with the orifice is improved compared to non-orifice case. Test result in site is 60% reduction in vibration.
초음파 도자를 쥐는 방법이 팔 근육의 근활성도에 미치는 영향
최석호(Seok-ho Choi),이충휘(Chung-hwi Yi),전혜선(Hye-sun Jeon),이정원(Jeong-weon Lee) 한국전문물리치료학회 2013 한국전문물리치료학회지 Vol.20 No.2
This study examined differences in the activity of upper limb muscles according to how an ultrasound head is gripped. Twenty-two adult males were participated in the study. Each participant was asked to apply ultrasound treatment on to a lump of pork meat by two different ultrasound head grip patterns: spherical and cylindrical grips. Muscle activity was measured in the extensor carpi radialis longus (ECRL), flexor carpi ulnaris (FCU), and pronator teres (PT), triceps brachii (TB), middle deltoid (MD), and upper trapezius (UT) muscles. There were no significant differences in the EMG signals of any muscle according to the ultrasound head grip pattern (p>.05). There were significant differences in the EMG signal of each type of muscle (p<.05). The EMG signal of UT was the lowest and that of TB was lower than ECRL and FCU. There were interactions between ECRL and FCU, between ECRL and PT, between FCU and ECRL, and between FCU and MD. The EMG signal of ECRL using the cylindrical head was low and that of FCU with the cylindrical head was high, while the opposite was the case with the spherical head (Padj<.05/15). The results of this study indicate that the wrist muscles worked actively when the participants applied ultrasound therapy using both spherical and cylindrical heads. A spherical head might induce imbalanced muscle activity among the wrist muscles, leading to deviation of the wrist joint. Therefore, the cylindrical head is recommended for ultrasound therapy because it produced a constant, repeated force.
산양유를 섭취한 성인 여성의 분변에서 분리한 Bifidobacteria와 Lactobacilli의 탄수화물 발효특성
최석호 ( Suk Ho Choi ),임영순 ( Young Soon Lim ),함준상 ( Jun Sang Ham ),정석근 ( Seok Geun Jeong ),이승배 ( Seung Bae Lee ) 한국유가공기술과학회 2015 한국유가공기술과학회지 Vol.33 No.2
산양유을 섭취한 성인의 분변 내 bifidobacteria의 증식 효과 및 분변에서 분리된 bifidobacteria와 lactobacilli의 당 발효능력을 조사하였다. 1. 산양유를 섭취한 처리군이 대조군보다 bifidobacteria 세균수가 상대적으로 높았으며, 8주에서 95% 신뢰한계에서 유의성이 있었다. 2. 분변에서 분리한 균주들을 13 균주의 16S rRNA 염기서열로 동정한 결과, 산양유를 섭취한 처리구는 B. adolescentis, B. longum, B. pseudocatenulatum, B. dentium, L. sakei 순으로 분리되었다. 대조군의 12 균주는 B. adolescentis, B. longum, L.ruminis, L. sakei, B. pseudocatenulatum 순으로 분리되었다. 3. 산양유 올리고당과 lactulose는 모든 bifidobacteria 및 lactobacilli균주가 발효하였다. Fructooligosaccaride는 B. adolescentis7 균주 모두 발효하였다. 조사한 B. pseudocatenulatum 4 균주, L. sakei 3 균주, B. longum 7 균주 중에서 각각 3, 2, 1 균주가 fructooligosaccharide를 발효하였다. The objective of this study was to investigate the effects of consuming goat milk on the bacterial counts (colony forming units [CFU]) in adult women and to evaluate the carbohydrate fermentation capacity of bifidobacteria and lactobacilli isolated from their feces. Adult women who consumed goat milk (treatment group) had relatively higher CFU of bifidobacteria than did the control group, and the difference was significant (p<0.05) after 8 weeks. In total, 13 strains isolated from the feces of women in the treatment group were identified using 16S rRNA sequencing as Bifidobacterium adolescentis, B. longum, B. pseudocatenulatum, B. dentium, and Lactobacillus sakei. Similarly, 12 strains isolated from the feces of women in the control group included B. adolescentis, B. longum, L. ruminis, L. sakei, and B. pseudocatenulatum. All isolated bifidobacteria and lactobacilli fermented goat milk oligosaccharide and lactulose. All 7 strains of B. adolescentis fermented fructooligosaccharides, and 3 of the 4 B. pseudocatenulatum strains, 2 of the 3 L. sakei strains, and 1 of the 7 B. longum strains fermented fructooligosaccharides.