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박정호,이춘식,박현건,김형갑 진주산업대학교 1998 산업과학기술연구소보 Vol.- No.5
The research described in this paper was conducted to estimate the level of air, water and soil pollution, and plans for environmental conservation in Chinju city. The characterizations of air, water and soil pollution in Chinju were investigated during the period of September and November of 1997. The concentrations of air and soil pollutant in Chinju were lower than a metropolitan areas or environmental standard. The pollution level of water quality were higher Keong-Ho and Yang-Chen river compared with Duck-Chen river.
차수수 껍질 주정 추출물의 항산화 활성과 식후 혈당 상승 억제 효과
전형식(Hyoung Sik Chun),권영인(Young In Kwon) 산업기술교육훈련학회 2018 산업기술연구논문지 (JITR) Vol.23 No.1
Inhibition of small intestinal α-glucosidases involved in the digestion and absorption of carbohydrates can significantly decrease the postprandial increase of blood glucose level after a mixed carbohydrate diet. In the current study, we evaluated the inhibitory activities of extracts from Sorghum bicolor (L.) Moench Hull (SMH) against rat small intestinal α-glucosidases. Furthermore, to determine the oxygen radical absorbance capacity (ORAC) in the Sorghum bicolor (L.) Moench Hull (SMH), phenolic content and ORAC value were measured by spectrophotomer and fluorescence detector. Consequently, ethanol extract from hull tested had a high α-glucosidase inhibitory activity. These in vitro studies indicate that hull extracts from Sorghum bicolor (L.) Moench which has antioxidant and α-glucosidase inhibitory activity have the potential in the development of effective anti-diabetic agents.
( Hyoung Gon Kim ),( Dong Jun Lee ),( Chun Sik Yoon ),( Seon Woo Cheong ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.4
We assessed the distribution of benthic macroinvertebrate at four surveying sites in Upo Wetland, a Ramsar site and the largest wetland in Korea, from February 2006 to November 2013. A long-term ecological monitoring was done monthly by using quantitative sampling method with dip net for analyzing the community change and correlation between the biodiversity and the environmental factors because environmental factors have a decisive effect on the community structure of the benthic macroinvertebrates. Total samples from the Upo Wetland area were classified into 3 phyla, 6 classes, 17 orders, 68 families, 176 species, and 25,720 individuals. Among the 176 species, 62 of the species had not been previously reported in this area. Asellus sp., Diplonychus esakii, and Gyraulus chinensis were the most common species in Upo Wetland. The change patterns of annual species diversity and species richness were calculated by using the average number of monthly occurring species and individuals. Diversity index increased from March to May and decreased after that showing lower diversity indices in July and August. It increased again in September and in October. Richness index showed similar tendency and fell around February and July, followed by a rising tendency around May and October. Correlation and regression analyses were performed with the change of biodiversity and each environmental factor. We found that water temperature have very significant positive correlation with species diversity in spring, and have significant indices in autumn and winter. On the other hand, precipitation showed a significantly negative correlation value in summer and autumn suggesting it has an effect on the community structure of benthic macroinvertebrates.
도시가스 정압기 안전운영을 위한 인터랙티브 훈련 방안 연구
김형진(Hyoung Jean Kim),박찬국(Chan Cook Park),이재용(Jae Yong Lee),이춘식(Chun Sik Lee),유철희(Chul Hee Yu) 한국가스학회 2017 한국가스학회지 Vol.21 No.1
도시가스 정압기 안전 운영을 위한 운전원 안전훈련시스템의 주요 구성 요소 중 하나인 안전훈련 시나리오를 설계하고 구현함에 있어서, 단일 시나리오가 일방적으로 진행되는 기존 훈련 방식을 개선한 훈련 방안을 연구하였다. 안전훈련시스템과 운전원간의 상호 작용을 통해 훈련 시나리오의 다양성을 향상시켜 훈련 효과를 올리는 방안으로 플랜트 안전훈련 플랫폼 상에서 적용 가능한 Finite State Machine 모델 기반의 인터랙티브 훈련 방안을 개발하였다. 본 훈련 시나리오 시스템으로 인해 향후 확장된 대상 플랜트에의 안전훈련시스템 적용가능성을 기대해볼 수 있었다. We developed the safety training methods which improve the current methods by overcoming the single scenario-based one-way communication between trainee and training system. We improved the design and implementation of the safety training scenarios, which is one of the most important components of the plant safety training system for safe operation of the city gas governor. The diversity and training effects of the training scenarios can be improved by interactive training between the plant safety training system and operators. The interactive training methods were developed based on Finite State Machine model which is applicable to and based on plant safety training platform. We could see the possibility of applying this method of safety training scenario system to other domain of plant safety training system.
내시경적 치료에 실패한 총담관석 환자에서의 복강경 총담관 탐색술
신형섭(Hyoung Seob Shin),전광식(Kwang Sik Chun),송인상(In Sang Song) 한국간담췌외과학회 2009 한국간담췌외과학회지 Vol.13 No.3
Purpose : Laparoscopic common bile duct exploration (LCBDE) has more advantages than conventional common bile duct surgery, but the use of this route for stone removal and biliary drainage remains controversial. The goal of this study was to investigate the usefulness of LCBDE in patients who had been failed in the endoscopic stone extraction. Methods : From November 2005 to August 2008, 52 patients aunderwent LCBDE due to failure of endoscopic stone extraction in Chungnam National University Hospital. Clinical data were collected and analyzed retrospectively. Results : Duodenal diverticulum (23 cases, 44.2%) was the most common cause in failure of endoscopic stone extraction and large common bile duct stone 12 cases (23.1%), previous upper gastrointestinal operation 10 cases (19.2%) were followed. Twenty four patients did not have preoperative biliary drainage, such as PTBD, ENBD, PTGBD. Forty-five patients (86.5%) of the 52 participating patients underwent LCBDE successfully, but 7 cases resulted in open surgery for the following reasons: 3 cases of severe intraabdominal adhesions, 3 cases of stone impaction in ampulla portion, and 1 case of a remnant stone. Extemal biliary drainage was performed in 41 cases with T-tube (31 cases, 68.9%), PTBD(7 cases, 15.6%), ENBD (3 cases, 6.7%). The stone clearance of LCBDE was 95.6%. Remnant stone were detected in 2 cases (4.4%) and removed with choledochoscope via extemal biliary drain. Postoperative complications happened in 5 cases (9.5%). Procedure related complications happened in 2 cases (3.8%). Conclusion : LCBDE is useful technique in patients with failed endoscopic stone extraction, and biliary drainage may be necessary for detection and removal of latent remnant CBD stones.
Byoung-Hyoung Kim,Seok-Hwan Kim,In-Sang Song,Gwang-Sik Chun 한국간담췌외과학회 2019 Annals of hepato-biliary-pancreatic surgery Vol.23 No.4
Backgrounds/Aims: The appropriate surgical treatment was investigated for T1b gallbladder (GB) cancer through a retrospective analysis of the clinical outcomes of patients with incidental T1 GB cancer. Methods: Patients with T1 GB cancer who were incidentally diagnosed while undergoing a simple cholecystectomy at Chungnam University Hospital from January 2004 to December 2017 were enrolled. Overall, 39 patients with T1 GB cancer, 17 patients with T1a, and 22 patients with T1b were included. We retrospectively analyzed the patients’ clinical and pathologic findings and follow-up results. Results: Among the 6490 patients who underwent cholecystectomy during the study period, 165 patients were diagnosed with GB cancer (T1=42 [25.5%]). The risk factor associated with recurrence and cancer-related death in patients with T1 GB cancer was lymphovascular invasion (recurrence, p=0.028; death, p= 0.004). In the T1b group, the 5-year disease-free survival (DFS) rate showed a statistical difference between patients with and without lymphovascular invasion (45.7% vs. 83.6%, p=0.048). There was no statistically significant difference in 5-year DFS and overall survival rate between simple cholecystectomy and extended cholecystectomy in T1b GB cancer with lymphovasular invasion (p=0.054 and p=0.091, respectively). Conclusions: In incidental T1b GB cancer, extended cholecystectomy was not superior to simple cholecystectomy in terms of the 5-year DFS rate and nor in overall survival rate or recurrence rate, even when lymphovascular invasion was identified after simple cholecystectomy. Therefore, simple cholecystectomy may be recommended as a primary surgical strategy for T1b GB cancer.