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A Study on the Techniques of Composite Mold Structure for Hovercraft Using New Material System
Yun-Hae Kim,Clung-Won Bae,Keun-Sil Park,Sung-Youl Bae,Kyung-Man Moon,Sung- Yul Lee,Young-Doe Jo,Byung-Yun Kang 한국항해항만학회 2008 한국항해항만학회지 Vol.32 No.9
Fiber reinforced plastics (FRP) have been widely used bemuse of their high specific strength, high specific stiffness and etc. Although these kinds of FRP have various merits in applications, it has been had one of the complicated problems to manufacture their wooden mold For these reasons, the simple methods to manufacture the mold required in the FRP industries. To improve these kinds of problems, the molding system using composite materials was developed By this new manufacturing techniques and high functional FRP composite mold was built. Comparing with wooden mold, the process efficiencies of frame manufacturing process and inner mold manufacturing process were improved approximately 40% and 70%, respectively.
The effects of progesterone and leptin on invasion and proliferation of Bewo cell
( Yun Sung Jo ),( Dong Kue Jang ),( Sa Jin Kim ),( Guisera Lee ) 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.98 No.-
Leptin and progesterone have been suggested to be involved in placentation. In the present work, we studied a possible effect of leptin and progesterone on trophoblastic cell proliferation, invasion. Leptin added to BeWo choriocarcinoma cell lines. The potential of cell proliferation, invasiveness was assessed by XTT and transwell invasion assay with different concentration of leptin. Leptin and progesterone added to BeWo choriocarcinoma cell lines and we examined same assay. After culture with different concenturations of leptin for 48 h, leptin could promote cytotrophoblast invasiveness in a dose-dependant manner. After culture with 5 ng/ml, 50 ng/ml and 100 ng/ml of leptin, the proliferation of cytotrophoblast was promoted, while with 500 ng/ml of leptin could inhibite the proliferation of cytotrophoblast. Progesterone inhibite leptin-induced cytotrophoblast invasion and proliferation. We conclude that progesterone and leptin play roles in controlling trophoblast invasion and proliferation.
( Yun Won Jo ),( Seung Suk Yoo ),( Sung Soo Kim ),( Jeong Mi Lee ),( Hyun Ju Min ),( Chang Yoon Ha ),( Hong Jun Kim ),( Woon Tae Jung ),( Ok Jae Lee ),( Hyun Jin Kim ) 대한내과학회 2011 대한내과학회 추계학술대회 Vol.2011 No.1
Colonoscopic polypectomy is a commonly performed procedure in Korea, subsequently prevents colon cancer. The increase of therapeutic colonoscopy, polypectomy, results in inevitably various complications including bowel perforation that is rare and requires emergent decision of treatment modalities and timely treatment. The bowel perforation is usually diagnosed on the basis of pneumoperitoneum on simple X-ray images. Surgery is the treatment of choice for most cases of colonic perforation. A 58-year-old woman was referred to the gastroenterologist for endoscopic mucosal resection (EMR) of laterally spreading flat adenoma in the sigmoid colon. The EMR was performed with flexible and insulated tip knives. The patient was hospitalized for close observation of post-EMR complications. On the day of the polypectomy, simple X-ray images were taken to rule out colonic perforation, which revealed a large amount of intracolonic gas, but no free air in the subphrenic area. The next day of the procedure, subcutaneous emphysema was observed by the clinicians. Then abdomen computed tomography (CT) scan was performed, which showed diffuse bilateral retroperitoneal air extending to the mediastinum without intraperitoneal gas. The patient was discharged from the hospital after medical treatment and supportive care. We herein report a case of colonoscopic perforation in which pneumomediastinum, subcutaneous emphysema and peumoretroperitoneum occurred in the absence of pneumoperitoneum. The perforation was successfully treated with medical treatment and endoscopic clipping. Colonoscopists should not exclude colonic perforation even though free air on simple X-ray images is not visible.
Jo Hyeong Ho,Kim Nayoung,Oh Hyeon Jeong,Song Du Hyun,Choi Yonghoon,Park Jaehyung,Lee Jongchan,Yoon Hyuk,Shin Cheol Min,Park Young Soo,Lee Dong Ho,Lee Hye Seung,Park Young Suk,Ahn Sang-Hoon,Suh Yun-Suh 거트앤리버 소화기연관학회협의회 2023 Gut and Liver Vol.17 No.5
Background/Aims: There are few reports regarding mixed carcinoma, defined as a mixture of glandular and poorly cohesive components, in patients with gastric cancer (GC). The aim of this study was to evaluate the proportion and characteristics of mixed carcinoma in GC patients. Methods: A total of 7,215 patients diagnosed with GC at Seoul National University Bundang Hospital were enrolled from March 2011 to February 2020. GC was divided into four groups (wellmoderately differentiated GC, poorly differentiated GC, poorly cohesive carcinoma, and mixed carcinoma). The proportion of each GC type and the clinicopathological features were analyzed and divided into early GC and advanced GC. Results: The proportion of mixed carcinoma was 10.9% (n=787). In early GC, submucosal invasion was the most common in poorly differentiated (53.7%), and mixed carcinoma ranked second (41.1%). Mixed carcinoma showed the highest proportion of lymph node metastasis in early GC (23.0%) and advanced GC (78.3%). In advanced GC, the rate of distant metastasis was 3.6% and 3.9% in well-moderately differentiated GC and mixed carcinoma, respectively, lower than that in poorly differentiated GC (6.4%) and poorly cohesive carcinoma (5.7%), without statistical significance. Conclusions: Mixed carcinoma was associated with lymph node metastasis compared to other histological GC subtypes. And it showed relatively common submucosal invasion in early GC, but the rates of venous invasion and distant metastasis were lower in advanced GC. Further research is needed to uncover the mechanism underlying these characteristics of mixed carcinoma (Trial registration number: NCT04973631).