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Propensity Score Matching을 이용한 위암과 대장암 환자들의 수술 전후 영양상태 변화의 비교
윤승훈,계봉현,김형진,전경화,강원경,조현민,진형민 한국정맥경장영양학회 2017 한국정맥경장영양학회 학술대회집 Vol.2017 No.-
Background: Patients with cancers arising from gastrointestinal tract may have some major risks to affect their nutritional conditions; cancer itself, absorption of nutrients and secretion of enzymes, passage disturbance of intestinal content from tumor, or surgery for gastrointestinal tract. Because most patients with gastrointestinal cancers undergo the curative surgery, the consideration on the change of their nutritional status according to the each time point (preoperative vs postoperative) may be very important. Purpose: In this study, we intended to investigate the change of the nutritional status after curative surgery in patients with gastric cancer (GC) or colorectal cancer (CRC) using various nutritional screening tools at each time point (preoperative vs postoperative). Also, we intended to compare our data related to nutritional issues among the types of surgery in GC and CRC group respectively. Materials & Methods: In our hospital, total 407 patients (206 patients with GC and 201 patients with CRC) underwent surgery for their diseases between July 2011 and June 2012. Of these, 195 patients with GC and 176 patients with CRC underwent curative resection. We tried to match patients from two groups using the propensity score. After matching patients with the propensity score, we analyzed the data from 170 patients (85 patients in GC group and 85 patients in CRC group). And then, we retrospectively evaluated patients` nutritional status at the time of admission for surgery and discharge after surgery with 4 nutritional screening tools including malnutrition screening tool for cancer patients (MSTC), the Seoul National University Bundang Hospital Nutritional Screening Tool (SNUBH-NST), Malnutrition Universal Screening Tool (MUST), and Nutritional Risk Screening (NRS) 2002. Although significance was defined as P ≤ 0.05, P ≤ 0.1 was regarded as marginal significance. Results: There was no postoperative mortality in our study. In preoperative period, the nutritional status in GC group was slightly better than that in CRC group according to MUST (P<0.001) and NRS 2002 (P=0.079). The preoperative risk of malnutrition was not related to incidence of postoperative morbidity. In both groups, the postoperative nutritional status was significantly impaired, compared with the preoperative status. In contrast to before the surgery, the postoperative nutritional status of CRC patients was significantly better than that of GC patients according to the MSTC (P=0.004) and MUST (P=0.007). At the time of hospital discharge after surgery, the incidence of lower serum albumin level (P=0.002) and more than 5% weight loss (P=0.013) were higher in GC group than in CRC group. Comparing the postoperative nutritional status among the type of surgery in each group, total gastrectomy in GC group (P=0.015) and proctectomy with diverting stoma in CRC (P=0.06) were related to more than 5% weight loss. Conclusions: The gastrointestinal cancer surgery might affect the postoperative nutritional status negatively, especially in GC surgery. Therefore, we should realize that the consecutive assessments of nutritional status and the appropriated nutritional supports are necessary to enhance the recovery after surgery and to introduce the additional oncological care on time.
윤승훈(Seung-Hoon Yoon),임화준(Hwa-Joon Lim),권양미(Yang-Mi Kwon),박도현(Do-Hyun Park),윤동진(Dong-JIn Yun) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
풍력발전기가 대형화됨에 따라 기존의 일반 케이블을 대체하여 대용량의 전력을 전송하는데 적합한 풍력발전 전용 케이블이 개발되고 있다. 이러한 케이블은 내열성, 내유성 내한성 등 포설 환경에 적합한 기계적 특성을 확보하고 있을 뿐만 아니라 전력 전송과 시스템 제어를 통합적으로 수행함으로써 해상 또는 산악지대 등 열악한 환경조건에 노출되어 있는 풍력발전 시스템의 안정적인 운영에 대한 신뢰도 향상에 기여하고 있다.
오픈 소스 미디어 서버를 활용한 H.264, AAC 스트리밍 서비스 개선
윤승훈(Seung-Hoon Yoon),민상원(Sang-Won Min),정민아(Mina Jung),이연우(Yeonwoo Lee),이성로(Seong Ro Lee) 한국통신학회 2012 한국통신학회 학술대회논문집 Vol.2012 No.6
본 논문에서는 오픈 소스 미디어 서버를 사용하여, H.264, AAC 기능을 강화하였다. H.264는 기존의 동영상 압축에 비해 향상된 압축률을 제공함으로써, 네트워크 상에서 데이터 전송율을 낮추는 효과를 가져온다. 오픈 소스 프로젝트들을 활용함으로써 진행 중이거나 완료된 전문가 그룹의 축적된 기술의 습득과 비용 절감, 향후의 업그레이드의 편리함을 이용하는 방안을 취하였다. 향상된 스트리밍 기술을 다양한 플랫폼에 적용하는 것을 목표로 하여, 서비스 기술 중심의 프로세스의 성능 개선에 목적을 두었다.
윤승훈(Seung-hoon Yoon),이상선(Sang-seon Lee),박경훈(Kyung-hoon Park),이봉이(Bong-yi Lee),김대기(Dae-gee Kim),박완기(Wan-ki Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Oil resource exhaustion and oil price rise require alternative energy source for automotive vehicles. One of these alternatives are Hybrid Electric Vehicle(HEV). The main energy transferring path of these vehicle is high voltage electric cable system which requires quite different properties from conventional low voltage electric cable system for automotive. We have developed high voltage cable system for HEV applying shielded cable. This paper handles various issues of high voltage cable systems especially in view point of cable design, specification, material as conductor and compound. The cable properties of withstand voltage, flame-retardancy, abrasion resistance, withstand low-temperature and heat-ageing were tested. The test method of cable flexibility is developed and test results show excellent flexibility. EMC test were performed under SAE J551-5, MIL C85485/6 and CISPR PUB 12 standards. The shield-efficiency was investigated with the different braided densities and showed that minimum density should be 70%. Also, temperature-rising test at 80℃ surrounding condition and short-term excess-current test was performed to see the cable sustainability under extraordinary operating consideration.