타워크레인의 파일기초 최적설계 알고리즘 개발

유상연,서덕석,김선국,Ryu, Sang-Yeon,Seo, Deok-Seok,Kim, Sun-Kuk 한국건축시공학회 2009 한국건축시공학회지 Vol.9 No.5

최근 건축물의 고층화에 따라 양중 계획의 중요성이 증대되고 있다. 타워크레인은 중요한 양중 장비로서의 역할을 수행하고 있으나, 구조적 안전사고 발생 시 그 피해가 매우 크므로 철저한 안정성검토가 선행되어야 한다. 타워크레인은 구조적 안정성을 확보하기 위해 횡지지 보강과 독립기초 및 파일기초 설계 등 안정성확보에 대한 고려가 매우 중요하며, 그 중 현장의 특수한 상황으로 인해 지내력 확보가 곤란하거나 더 이상 기초 사이즈를 증가시킬 수 없을 때 파일기초를 사용한다. 파일기초를 사용할 경우 독립기초 사용 시 보다 더 많은 안정성 검토 항목을 고려 해야하므로 체계적이고 철저한 검토가 필요하다. 본 연구는 파일기초 설계 시 파일기초의 기본적인 안정성 확보 뿐 만 아니라 최소의 비용 발생을 위한 최적설계 알고리즘 개발이 목적이며, 파일기초를 사용하는 고정식 트롤리타입의 타워크레인으로 연구 범위를 제한하여 진행한다. 타워크레인 파일 기초의 안정성 검토 항목과 절차, 최적설계에 관한 연구 결과물을 토대로 관련 업무 담당자의 업무 효율성을 향상 시킬 수 있을 뿐 아니라 파일 기초 설계에 투입되는 시간 및 비용의 절감효과를 기대 할 수 있다. As buildings increase in height, lifting plans are becoming increasingly important on construction sites. As a critical piece of load-lifting equipment, the tower crane deserves a well thought-out stability review, since it has a significant impact and is very vulnerable to structural safety disaster. To ensure the structural stability of a tower crane, its lateral support or pile supported foundation designs must include consideration for stability, and pile foundation must be used if site conditions prevent soil from providing the required bearing capacity, or prevent the foundation from being increased to the required extent. Pile supported foundation design requires thorough and systematic review, as more stability parameters need to be considered than with an independent foundation. This paper intends to develop an optimal design algorithm that can minimize associated costs while ensuring the fundamental stability of pile supported foundation design, limiting the scope of research to fixed-type trolley tower cranes using pile supported foundations. The findings herein on pile foundation stability review parameters, process and optimal design are expected to improve the operational efficiency of staff concerned, and reduce the time and efforts required for pile foundation design.

과학의 향기-돼지비계로 움직이는 자동차

유상연,Yu, Sang-Yeon 대한결핵협회 2007 보건세계 Vol.54 No.7

호스피스 케어를 위해 입원한 말기 암 환자의 사망직전 의료비용 실태 조사

유상연,이혜리,이용제,안미홍,염창환,Yoo, Sang-Yeon,Lee, Hye-Ree,Lee, Yong-Je,Ahn, Mi-Hong,Yeom, Chang-Hwan 한국호스피스완화의료학회 2002 한국호스피스.완화의료학회지 Vol.5 No.2

배경 : 세계적으로 암의 발생률과 사망률은 증가하는 추세로, 그로 인한 의료비 상승의 문제로 국가 정책의 필요성이 대두되고 있다. 이에 저자 등은 호스피스 케어를 위해 입원한 말기 암 환자들의 의료비용 실태를 조사하고 이와 관련된 요인도 함께 살펴보아 불필요한 의료비용 부분의 효과적 감소에 도움이 되고자 하였다. 방법 : 2000년 7월 1일부터 2002년 6월 30일 사이에 경기도 고양시에 소재한 모 병원 가정의학과에 말기 암으로 입원하여 사망한 환자 259명을 대상으로 인구통계학적 자료 암의 기왕력, 임상소견, 의료비용을 조사하였다. 의료비용은 환자의 사망직전 입원 당시의 원무과 계산서를 근거로 세부 항목을 조사하였다. 인구통계학적 특성, 암의 기왕력, 임상 소견과 평균 의료비용과의 상관관계를 ANOVA로 조사하였다. 결과 : 말기 암 환자 259명중 남자가 135명(52.1%), 여자가 124명(47.9%)이었으며, 암의 종류는 위암이(58명, 22.4%) 제일 많았다. 입원 당시의 임상소견은 식욕부진이 227명(87.6%), 통증이 199명(76.8%), 오심 구토가 152명(58.7%) 순으로 높게 나타났다. 총 의료비용은 740,628,045원이었으며 환자 1인당 평균 의료비용은 $285,968{\pm}3,070,272$원이었다. 총 의료비용 중에서 주사료가 237,038,259원(32.0%)로 가장 많았고 병실료가 206,416,669원(27.9%), 검사료(임상병리 검사료와 진단 방사선료)가 103,417,747원(14.0%) 순이었다. 평균 의료비용은 주사료, 치료방사선료, 병실료 순으로 높았다. 인구통계학적 특성, 암의 기왕력, 임상소견의 항목 중 통증만 유일하게 평균 의료비용과 상관관계가 있었다(P<0.05). 결론 : 호스피스 케어를 받는 말기 암 입원 환자들에서 불필요한 마약성 진통제 등 주사 투여를 가능하면 줄이고 가정 내 호스피스를 활성화하고 과도한 검사를 줄임으로써 보다 더 효과적인 비용 절감을 도모할 수 있을 것으로 보인다. Purpose : Death due to cancer has been continuously increasing, therefore cancer is the first in the cause of death now. A national policy for the elevation of medical costs in cancer patients is necessary, therefore, we searched for the medical costs and its related factors in terminal cancer patients for the effective reduction of the medical costs. Methods : We reviewed the medical records of 259 hospitalized terminal cancer patients who had died during the period of July 1, 2000 to June 30, 2002. History of cancer included type of cancer, type of past treatment, existence of metastasis. Clinical manifestation was examined and medical costs on last admission was categorized based on the account of charges of the department of patient affair on the last hospitalization. For analysis of factors related with medical costs, ANOVA was used. Results : Of the 259 patients, the number of male was 135 cases (52.1%), and the female, 124 cases (47.9%). The most frequent type of cancer was stomach (21.9%) cancer. Of the clinical manifestation, anorexia (87.6%) was the most frequent manifestation. Total medical costs was 740,628,045won, the mean costs was $285,968{\pm}3,070,272won$. The frequent category of medical costs was injection (32.0%), medical accommodation (27.9%), examination (14.0%), in order. The only factor related with mean medical costs was pain (P<0.05). Conclusion : If unnecessary injection of opioid analgesics is reduced, hospice care at home is activated and excessive examination is reduced In terminal cancer inpatients, it will be possible to reduce the medical costs in terminal cancer patients more effectively.

SWAT-AGRIMAN 모형의 적용성 평가

유상연(Yoo Sang Yeon),신성철(Sin Sung Chul),문용주(Moon Yong Joo),윤여승(Yoon Yeo Seung) 대한토목학회 2009 대한토목학회 학술대회 Vol.2009 No.10

유한 요소 해석을 이용한 1.5GPa급 사이드아우터의 일체형 핫스탬핑 성형 공정 설계

박승연(S. Y. Park),이현철(H. C. Lee),유상제(S. J. Yoo),송종호(J. H. Song) 한국소성가공학회 2016 한국소성가공학회 학술대회 논문집 Vol.2016 No.10

Rho-Associated Kinase 2 Polymorphism in Patients With Vasospastic Angina

유상용,김정욱,정상식,신대희,Jinkun Jang,이창근,Seung-Jea Tahk,신준한,최소연,윤명호 대한심장학회 2012 Korean Circulation Journal Vol.42 No.6

Background and Objectives: Recent studies indicate that in response to vasoconstrictor stimuli, the small GTPase RhoA and its down-stream effector, Rho-associated kinase 2 (ROCK)/Rho-kinase, are associated with hypercontraction of the vascular smooth muscle of coro-nary arteries through augmentation of myosin light chain phosphorylation and Ca 2+ sensitization. Expression of ROCK/Rho-kinase mRNA was significantly increased and up-regulated in the spastic coronary artery in a porcine model, and a specific inhibitor of ROCK/Rho-ki-nase inhibited coronary artery spasm in humans. We therefore explored the role of ROCK2 polymorphisms in the pathogenesis of vaso-spastic angina (VA). Subjects and Methods: We studied 106 patients with VA who exhibited spontaneous or provoked coronary spasm during coronary angio-graphy and compared the prevalence of ROCK2 polymorphisms between this group of patients with VA and controls whose angiograms were normal, and in whom the ergonovine test did not cause spasm (n=107). Five single nucleotide polymorphisms (SNPs) of the ROCK2gene were selected. SNPs were genotyped by high-resolution melting. Linkage disequilibrium and haplotype analyses were performed us-ing the SHEsis program. Results: The prevalence of genotypes of the 5 interesting SNPs in patients with VA was not different from that in the control group. In haplo-type analysis, the haplotype G-T-C-T-G (in order of rs978906, rs2271621, rs2230774, rs1515210, and rs3771106) was significantly associ-ated with a decreased risk of VA (p=0.007). Conclusion: The haplotype G-T-C-T-G in the ROCK2 gene had a protective effect against VA, suggesting the involvement of ROCK2 in VA pathogenesis.

연료 다변화에 따른 용융 탄산염 연료전지 시스템 운전 특성

임석연,성용욱,한재영,유상석 한국수소및신에너지학회 2015 한국수소 및 신에너지학회논문집 Vol.26 No.2

The fuel cells have been investigated in the applications of marine as the high efficient and eco-friendly power generating systems. In this study, modeling of IR Type molten carbonate fuel cell (Internal Reforming Type molten carbonate fuel cell) has been developed to analyze the feasibility of thermal energy utilization. The model is developed under Aspen plus and used for the study of system performances over regarding fuel types. The simulation results show that the efficiency of MCFC system based on NG fuel is the highest. Also, it is also verified that the steam reforming is suitable as pre-reforming for diesel fuel.

관동맥 분지병변에서 스텐트시술 후 분지폐쇄 발생의 예측인자

최소연,탁승제,김한수,염철훈,윤명호,유상용,안성균,장혁재,황교승,신준한,최병일 대한순환기학회 2002 Korean Circulation Journal Vol.32 No.8

볼텍스 튜브의 에너지 분리효율 최적화를 위한 기하학적 형상 연구

임석연(Seokyeon Im),유상석(Sangseok Yu) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

Vortex tubes are used in many industrial fields as parts for refrigerating machines due to their many intrinsic benefits. Although the use of these types of tubes has become common, the characteristics of energy separation associated with these tubes have yet to be vigorously researched. In this study, a counter-flow type of vortex tube is employed to investigate the energy separation characteristics with various geometric configurations. A parametric study was conducted to evaluate the performance of the vortex tube with various geometric structures and operating inlet pressures. The results show that variation of the cold exit orifice hole diameter significantly influences the energy separation between two exits.

바이오 디젤 혼합비에 따른 커먼레일 인젝터의 분사 및 내구특성에 관한 실험 연구

임석연 ( Seok Yeon Im ),김태범 ( Tae Bum Kim ),유상석 ( Sang Seok Yu ) 한국분무공학회 2011 한국액체미립화학회지 Vol.16 No.1

An object of this study is to understand the correlation of injection characteristics and injector dimensions according to biodiesel mixture. The Injection characteristics of different types of common-rail injectors are the number of nozzle holes (5~8), jet cone angle (146˚~153˚), hydraulic flow rate (830~900 ml/min) injection quantity and response time. Prior to characteristic experiment, the reference injector has been selected in 6 candidates injectors under the investigation of injected quantity according to the biodiesel mixture so that injector type can be determined. The injector is used for the characteristic experiment which varied the various operating conditions including pressure 23 MPa, 80 MPa, 160MPa, changing in injection duration 0.16 ms~1.2 ms and even mixture ratio. The result shows that the nozzle hole number and cone angle influence the injection quantity much more than nozzle hole diameter at low injection pressure and the nozzle hole diameter at high injection pressure, post injection duration.