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Yun Ho Chung,Doo Jin Kim,In-Gyu Kim,Han Jun Kim,Seong Eun Chon,Jang Yong Jeon,Jae Pil Jung,Jin Cheol Jeong,Joo Seop Kim,Eun Joo Yun 한국간담췌외과학회 2012 한국간담췌외과학회지 Vol.16 No.1
Backgrounds/Aims: Bile duct injury is one of the potential severe complications that can occur during laparoscopic cholecystectomy, which can be cause by anatomic variations in the confluence of the bile duct. Recently magnetic resonance cholangiopancreatiocography (MRCP) has become a helpful tool to detect bile duct variation on a preoperative basis and to prevent bile duct injury during laparoscopic cholecystectomy, as well other hepatic surgeries. This study aimed to clarify the types of bile duct on MRCP and to search for a method of avoiding injury during laparoscopic cholecystectomy. Methods: Between January 2009 and December 2010, 277 patients underwent laparoscopic cholecystectomy with preoperative MRCP in our institution. On a retrospective basis, the bile ducts were categorized into 5 types according to the Couinaud classification system. Results: The proportion of types was revealed type A (70.4%), type B (8.7%), type C (19.5%), type D (0.7%), type E (0%), and type F (0.7%), respectively. Bile duct injury occurred in 4 cases (1.4%) during laparoscopic cholecystectomy. In particular, the possibility of aberrant extrahepatic confluence (Type C and F) represented the highest risk of duct injury (OR=11.89 [CI: 1.21-116.53]). Conclusions: Preoperative evaluation of the bile duct anatomy is important to avoid injury of duct during laparoscopic cholecystectomy. Specific types of bile duct variation should be considered as a high risk group for bile duct injury. (Korean J Hepatobiliary Pancreat Surg 2012;16:17-23)
Production and Location of Xylanolytic Enzymes in Alkaliphilic Bacillus sp. K-1
( Yun Sik Lee ),( Khanok Ratanakhanokchai ),( Weela Piyatheerawong ),( Khin Lay Kyu ),( Min Suk Rho ),( Yong Seok Kim ),( Ae Son Om ),( Joo Won Lee ),( Ok Hwa Jhee ),( Ju Seop Kang ),( Gil Hyung Chon 한국미생물생명공학회 2006 Journal of microbiology and biotechnology Vol.16 No.6
The fabrication of flip-covered plasmonic nanostructure surfaces with enhanced wear resistance
Jung, Joo-Yun,Sung, Sang-Keun,Kim, Kwang-Seop,Cheon, So-Hui,Lee, Jihye,Choi, Jun-Hyuk,Lee, Eungsug Elsevier 2017 OPTICS COMMUNICATIONS - Vol.382 No.-
<P><B>Abstract</B></P> <P>Exposed nanostructure surfaces often suffer from external dynamic wear, particularly when used in human interaction, resulting in surface defects and the degradation of plasmonic resonance properties particularly in terms of transmittance extinction rate and peak-to-valley slope. In this work, a method for the fabrication of flip-covered silver nanostructure-arrayed surfaces is shown to enhance wear resistance. Selectively transferred silver dot and silver webbed-trench exposed reference samples were fabricated by metal nanoimprint, and flip-covered samples were created by flipping and bonding reference samples onto a PET film coated with an adhesive layer. The samples' spectral transmittance was measured before and after a dynamic wear test. Some spectral shift was observed due to the change in refractive index of the surrounding media, but this was not as significant as the effects of the other chosen geometry factors. It was found that dynamic wear had a greater effect on the plasmonic resonance behavior of the exposed samples than in those that had been flip-covered. This suggests that flip-covering may be an effective strategy for the protection of plasmonic resonators against dynamic wear. It is expected that the slight variations in spectral transmittance could be compensated through proper tuning of the sample geometry.</P>
( Hyun Joo Song ),( Jeong Seop Moon ),( Seong Ran Jeon ),( Jin-Oh Kim ),( Jinsu Kim ),( Dae Young Cheung ),( Myung-Gyu Choi ),( Yun Jeong Lim ),( Ki-Nam Shim ),( Byong Duk Ye ),( Jae Hee Cheon ),( Che 대한소화기학회 2017 Gut and Liver Vol.11 No.2
Background/Aims: In some cases, chronic diarrhea is unexplained, and small bowel disorders may be one of the causes. The aim of this study was to assess the diagnostic yield and clinical impact of video capsule endoscopy (VCE) in patients with chronic diarrhea. Methods: We retrospectively analyzed records from October 2002 to August 2013 in the VCE nationwide database registry (n=2,964). Ninety-one patients from 15 medical centers (60 males and 31 females; mean age, 47±19 years) were evaluated for VCE as a result of chronic diarrhea. Results: The duration of chronic diarrhea was 8.3±14.7 months. The positive diagnostic yield of VCE was 42.9% (39/91). However, 15.4% (14/91) exhibited an inconsistent result, and 41.8% (38/91) were negative. Abnormal findings consistent with chronic diarrhea included erosions/aphthous ulcers (19.8%), ulcers (17.6%), mucosal erythema (3.3%), edema (1.1%), and luminal narrowing (1.1%). The most common diagnoses were functional diarrhea associated with irritable bowel syndrome in 37 patients (40.7%) and Crohn`s disease in 18 patients (19.8%). After VCE examination, the diagnosis was changed in 34.1% of the patients (31/91). Hematochezia (odds ratio [OR], 8.802; 95% confidence interval [CI], 2.126 to 36.441) and hypoalbuminemia (OR, 4.811; 95% CI, 1.241 to 18.655) are predictive factors of a positive diagnostic yield. Conclusions: VCE had a favorable diagnostic yield and clinical impact on the management of patients with chronic diarrhea. (Gut Liver 2017;11:253-260)
부유두 내 췌관 배액관 삽입술 및 부유두 괄약근 절개술로 호전된 만성 췌장염 1 예
조주영,이준성,이문성,김연수,심찬섭,조영덕,문종호,정인섭 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.3
The anatomy of the pancreatic ducts and their variations are best defined through a pancreatography, which is especially useful for determining the appropriate endoscopic management. Pressure in the pancreatic ductal system has been shown to be significantly higher in patients with painful chronic pancreatitis and dilated ducts when compared with pressure in controls. The aim of pancreatic drainage procedures is to improve the outflow of pancreatic juice, thereby lowering intraductal pressure and affording relief of pain. It is necessory for both endoscopic pancreatic sphincterotomy (EPS) and stenting have to be performed at the papilla of the dominant duct, which is the Wirsung duct (embryologic $quot;ventral$quot; duct), in the majority such of cases. An EPS of the minor papilla should be considered when the duct of Santorini (embryologic $quot;dorsal$quot; duct) predominates, as in patients with complete or incomplete divided ducts or with a distorted connection between the ventral and the dorsal duct. In these patients, access to the main pancreatic duct (MPD) is easier through the duct of Santorini. A 42 year-old man was admitted with chronic recurrent pancreatitis. Minor papilla sphincterotomy and endoscopic stent placement were performed for the drainage of the dorsal pancreatic duct. After stenting of the minor papilla, abdominal pain disappeared and pancreatitis did not develop after a 7 month follow-up, the stent was changed.
You, Joo Hyung,Lee, Se Han,You, Chan Ho,Yu, Yun Seop,Kim, Tae Whan American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.5
<P>A compact model of the current-voltage (I-V) characteristics for the Si nanowire field effect transistor (FET) taking into account dependence of the analytical electrical properties on the diameter and the concentration of the Si nanowire of the FETs with a Schottky metal-semiconductor contact has been proposed. I-V characteristics of the nanowire FETs were analytically calculated by using a quantum drift-diffusion current transport model taking into account an equivalent circuit together with the quantum effect of the Si nanowires and a Schottky model at Schottky barriers. The material parameters dependent on different diameters and concentrations of the Si nanowire were numerically estimated from the physical properties of the Si nanowire. The threshold voltage, the mobility, and the doping density of the Si nanowire and the Schottky barrier height at a metal-Si nanowire heterointerface in the nanowire FET were estimated by using the theoretical model.</P>