外科領域에서의 Cefmetazon(C.M Z., CS-1170)의 臨床的 效果

徐允錫,李燦泳 최신의학사 1983 最新醫學 Vol.26 No.2

WWW상의 지리정보 처리를 위한 GIRS 설계

서윤석 김천과학대학 1997 김천과학대학 논문집 Vol.23 No.-

Much researches on GIS are mainly focused on geographic information retrieval systems process user requests on server system. So it causes server system to be overloaded and network traffic between server system and Internet client system to be raised and so system does not transfer all user input type to server system, user query input type is restricted. In this paper, I propose the design of geographic information retrieval system which reduces server loads and the network traffic between server system and client system resulting faster system response, and provides various query input method for Internet client user. The proposing system consists of user interface processor which inputs user query and displays the processing result, geographic information processor which processes user query and communication manager which handles the communication between server system and client system.

포인터를 이용한 데이타베이스의 설계

서윤석 김천과학대학 1994 김천과학대학 논문집 Vol.20 No.-

Procedural languages have long used pointer to hold and manipulate data, so programmers are used to designing data with them. Pointer datatype did not support in standard SQL, so we have used join for selecting information from two or more related tables. This paper proposes the pointer datatype to design the tables of database. The pointer datatype increases the speed of selecting information and saves the volume of storing data in database.

관계데이터베이스 권한부여에 관한 연구

서윤석 김천과학대학 1995 김천과학대학 논문집 Vol.21 No.-

A multiuser database system must selectively permit users to share data, while retaining the ability to restrict data access. There must be a mechanism to provide protection and security, permitting information to be accessed only by properly authorized users. Further, when tables or restricted views of tables are created and destroyed dynamically, the granting, authentication, and revocation of authorization to use them must also be dynamic. This paper propose the extended authorization mechanism to manage database users and to provide protection and security of database.

Unaided Stapling Technique for Pure Single-Incision Distal Gastrectomy in Early Gastric Cancer: Unaided Delta-Shaped Anastomosis and Uncut Roux-en-Y Anastomosis

서윤석,박지호,김태한,허연주,손영길,Jun-Young Yang,Seong-Ho Kong,이혁준,양한광 대한위암학회 2015 Journal of gastric cancer Vol.15 No.2

Purpose: Intracorporeal anastomosis is the most difficult procedure during pure single-incision distal gastrectomy (SIDG) that affects its generalization. We introduced unaided delta-shaped anastomosis (uDelta), a novel anastomosis technique, for gastroduodenostomy after pure SIDG, and compared the results with those of previously reported Roux-en-Y anastomosis (RY). Materials and Methods: Between March 2014 and March 2015, SIDG with D1+ lymph node dissection was performed for early gastric cancer through a 2.5-cm transumbilical incision without any additional port. uDelta was performed by the operator alone, without any intracorporeal assistance. Results: uDelta was performed on 11 patents, and uncut RY was performed on 5-patients without open or multiport conversion. R0 resection was performed in all cases. No significant differences were observed in mean age and body mass index between patients who underwent uDelta or RY. Mean operation times were 214.5±36.2 minutes for uDelta and 240.8±65.9 minutes for RY, which was not significantly different. Reconstruction time for uDelta was shorter than that for RY, with marginal statistical significance (26.1±8.3 minutes vs. 38.0±9.1 minutes, P=0.05). There were no intraoperative transfusions, 30-day mortality, or anastomosis-related complications in either group. Average length of hospital stay was 8.2±1.9 days in the uDelta group and 7.2±0.8 days in the RY group (P=0.320). Conclusions: After carefully considering indications, uDelta can be a feasible and can be a reproducible reconstruction method after SIDG in early gastric cancer.

공간 데이터에서 시공간 데이터의 효율적인 집계 연산

서윤석 김천과학대학 2005 김천과학대학 논문집 Vol.31 No.-

Recently, the data that is simply summarized from spatial data warehouses is required. Aggregate operation can be obtained from spatial data warehouses directly whenever it is needed, but it costs lots of time. Thus pre-aggregation is required for the efficient OLAP(On-Line Analytical Processing) operation. There are two kinds of spatiotemporal data: current and past data. Previous studies, which manage the pre-aggregate information from spatial data warehouses, provide only one type of pre-aggregate information, so previous studies can not provide real time responses when the current and past data are queried frequently. Also, the method that gives only past aggregate information can not supply the OLAP operation by time dimension because it can not maintain the historical information. In this thesis, method that can manage the pre-aggregate information of current and past spatiotemporal data efficiently is proposed. The proposed method maintains current aggregate information by aR-tree and keeps historically summarized aggregate information by HISAT(Historically Summarized Aggregate Table) at the same time.

2-3 : Combined Enteral and Parenteral Nutrition for Anastomotic Leakage after Gastric Cancer Surgery

서윤석,이혁준,이경구,오승영,공성호,양한광 한국정맥경장영양학회 2013 한국정맥경장영양학회 학술대회집 Vol.2013 No.-

Background: The effectiveness of enteral nutritional for patients with anastomotic leakage after gastric cancer surgery is controversial. The purpose of this study is to compare effectiveness between combined enteral nutrition with parenteral nutrition (EPN) and total parenteral nutrition (PN). Methods: From April 2010 to August 2012, the patients who underwent gastric cancer surgery for primary gastric cancer were reviewed. Clinicopathologic characteristics, complication, laboratory tests and body weight (Bwt) were compared between EPN and PN. Results: Among those patients with postoperative leakage within postoperative 1 month (n=43), 23 patients were supported by EPN and 13 patients by PN. Clinicopathologic characteristics including preoperative Bwt, BMI, nutritional status, other complications and TNM stage were similar. Preoperative CRP and albumin were similar between EPN and TPN. Supported calorie percentage over basal energy expenditure by EPN was less than that by TPN (98±41% and 129±13%, P=0.020). After 1 week of nutritional support, albumin at EPN was significantly higher than that of PN (3.52±0.3 and 3.25±0.3, P=0.010). Adjusted by preoperative Bwt, preoperative nutritional status, and Bwt difference between preoperative and pre-nutritional support period, Bwt decrease between pre-nutritional support and discharge was significantly less at EPN than at TPN (-4.5±5.4 % and -6.3±4.1%, P=0.001). Conclusion: In terms of the maintenance of serum albumin and Bwt during nutritional support, EPN may be better supportive option than TPN for the patients with anastomotic leakage after gastric cancer surgery.

공정경쟁기반 : 접속료와 회계분리

서윤석 한국통신학회 1995 한국통신학회 심포지움 Vol.- No.-

캐싱기법을 이용한 SQT의 설계

서윤석 김천과학대학 2007 김천과학대학 논문집 Vol.33 No.-

S-XML(Spatial-eXtensible Markup Language) is expanded form of XML which supports heterogeneous spatial data for both integrating and circulating. The S-XML support system is based on Spatial Database Management System(SDBMS) which stores, manages and provides S-XML to the users. For this purpose, the transformation process between S-XML data and binary data is required. Especially the spatial data has complex data type and large data size than aspatial data, so it demands heavy transformation cost. Therefore, a method to reduce the transforming cost of spatial data in S-XML is required. In this thesis, the SQT(Spatial Query transformer) using caching method is proposed. The proposed method caches only spatial data in S-XML. This S-XML is the result of transforming binary data which is processed by SDBMS. At first, in the process of transformation, S-XML transformation component uses OID within the results data, which in turn is processed by SDBMS, When processing query, types are separated by analysis. In the case of range query, it uses the R-tree index and for the other cases, hash index is used. Depending on the search results, if the cached data is available, replacement to S-XML is possible without transformation costs. But, there is a consistency problem with cache data and database of SDBMS in cases of insert, delete and update query processing in SDBMS. For this purpose, consistency is maintained by using OID information which is sent through the update processed by SDBMS. The proposed SQT using caching method is reduced the transforming cost.

공간 데이터베이스에서 확장된 R-Tree를 이용한 효율적인 공간 질의 처리

서윤석 김천과학대학 2004 김천과학대학 논문집 Vol.30 No.-

R-Tree provides indirect access path to spatial object by using MBR(Minimum Boundary Rectangle). Various kind of object approximation method has been proposed, but most of them has low filtering performance. MBR decomposition methods has been proposed to upgrade filtering performance but it has disadvantage when object is very complex because it require large size of additional space to store decomposed MBR. Another solution to solve low performance of filter step in R-Tree is object decomposition method. It has good filtering performance but when information on original object is needed, object has to be reconstructed. In this thesis, we proposed extended R-Tree which has grid for secondary filter. Girds consist of cells which store information on original object. Each cells represents whether any part of original object is existed in cell boundary or not. Proposed method requires relatively small amount of space, and it provides easy way of inspection.