PSInSAR 기법을 이용한 태국 방콕 지반침하 관측

전우현 ( Woohyun Jeon ),이종혁 ( Jonghyuk Yi ) 대한원격탐사학회 2021 大韓遠隔探査學會誌 Vol.37 No.6

태국 방콕에서는 급격한 도시화에 따른 지반침하 현상이 사회적 문제로 제기되고 있다. 낮고 평평한 지형 및 삼각주 인접성으로 인해 방콕 지역은 홍수에 취약하며, 이에, 홍수 위험을 증대시킬 수 있는 지반침하에 대한 모니터링은 중요한 의미를 지닌다. 본 논문에서는 2018년 6월부터 2021년 10월까지 수집된 Sentinel-1 위성 자료에 PSInSAR 기법을 적용하여 방콕 지역의 지반침하 분석을 수행하였다. 상향 및 하향 궤도에서 획득된 자료를 통해 산출된 수직 변위 결과에 의하면, 방콕 지역에서는 30 mm/yr에 이르는 국지적인 지반침하 현상을 나타내었으며, 80 mm에 이르는 지속적인 침하 현상이 교외 지역에서 관측되었다. 교외 지역에서는 공업 및 농업 활동이 주로 이루어지며, 이에, 관측된 변위는 지하수위 저하에 의한 것으로 여겨진다. 향후 연구에서는 대수층의 지하수 변화 양상에 대한 분석이 필요할 것으로 보여진다. In Bangkok, Thailand, there is an increasing concern for ground subsidence with the rapid urbanization. Given the presence of flood vulnerability due to the flat low-lying topography and proximity to the river delta, it is particularly significant to monitor deformation that can potentially augment flood hazards. In this paper, we have applied persistent scatterer interferometric synthetic aperture radar (PSInSAR) technique to investigate subsidence in Bangkok with the use of Sentinel-1 acquisitions spanning from June 2018 to October 2021. The vertical displacement velocity obtained from both ascending and descending orbits revealed regional-scale subsidence at rates up to 30 mm/yr. In addition, ongoing subsidence was observed in the suburb areas with the localized vertical subsidence exceeding 80 mm. The areas are primarily industrial and agricultural sectors, thus, the ground subsidence detected is probably caused by groundwater withdrawal. However, further work is needed to diagnose the trends of aquifer resources.

≪맑스주의 역사 강의≫ 서평 - 몇 가지 쟁점을 중심으로

전우재 노동사회과학연구소 2022 정세와노동 Vol.- No.178

IMO 참석결과보고: IMO 제15차 산적액체 및 가스 전문위원회 (BLG 15)

전우석,Jeon, U-Seok 선박안전기술공단 2011 선박안전 Vol.31 No.-

관상동맥질환과 대동맥판 폐쇄부전증을 동반한 복부 대동맥류 수술 중 대동맥 겸자 후 발생한 심정지

전우재,심재항,김경헌,조상윤,홍진범 대한중환자의학회 2009 Acute and Critical Care Vol.24 No.2

Department of Anesthesiology and Paine Medicine, Hanyang University College of Medicine, Guri Hospital, Guri, Korea Patients with chronic aortic regurgitation have a hemodynamically fragile equilibrium; increased afterload during infrarenal aortic cross-clamping and acute decompensation. The tolerance of patients with severe coronary artery disease to the stress of infrarenal aortic cross-clamping differs from patients without overt coronary artery disease. Therefore, careful anesthetic management is needed during infrarenal aortic cross-clamping in patients with aortic regurgitation and coronary artery disease. We describe the anesthetic management of a man with an infrarenal aortic aneurysm that underwent cardiac arrest after aortic-cross clamping for aortoiliac bypass surgery.

각종 간 질환에서의 종양유전자 및 성장인자 표현에 관한 연구

전우기,염범우 고려대학교 의과대학 1995 고려대 의대 잡지 Vol.32 No.3

The current concept of the carcinogenesis is that activated oncogenes or mutation of suppressor genes might inhibit the programmed cell death and permit cells to live forever. There are structural and functional similarities between the oncogenes and growth factors. Both substances act their functions by autocrine and paracrine effects on target cells and they appear in fetal, regenerating and sometimes in normal cells. In this study, I tried to find out which oncogenes and growth factors are involved in the process of carcinogenesis of the human liver. 53 cases of needle biopsied or resected liver specimens were used in immunohistologic study with anti sera of c-H-ras, c-myc. erbB2 and bcl-2 and antisera of TGFα and EGF. The results are as followings. 1. The antisera of EGF and TGFα revealed positive reaction on most of the normal liver tissue, hepatitis, cirrhosis and hepatoma. 2. The c-myc anti serum reveals positive reaction on only two cases of hepatoma. 3. c-H-ras antiserum revealed positive reaction on 1 case of CAH, cirrhosis and hepatoma. 4. The antisera of erbB2 and bcl-2 revealed negative reaction on all liver tissues. These findings are highly suggestive that c-H-ras and c-myc are responsible for causative oncogenes of hepatoma rather than bcl-2 and erbB2.

공압을 이용한 수중운동체의 수압시뮬레이터 설계 연구

전우선,정원지,김원제,남경원 國立 昌原大學校 産業技術硏究所 2000 産技硏論文集 Vol.14 No.-

HILS(Hardware In Loop Simulation) is an effective means of testing unmanned underwater vehicle under extreme operational conditions and a variety of operational environments. In order to verify the vehicle performance under time-varying pressure conditions, a reliable pressure simulator is vital to an integrated system for the HILS. This paper presents the results of design research for the pressure simulator using pneumatic pressure (nitrogen), a high speed solenoid valve and a PWM control method. The test and evaluation results of the pressure simulator show that the simulator can generate an appropriate level of desired pressure with an average error below 1m depth for time-varying pressure change conditions corresponding to vehicle dynamics. In addition, the levels of overshoot and vibration have been shown to be under the requirements of design specifications.

강원도 두 집수구역 하천에서의 현장수질 및 라돈농도 비교

전우현(Woo-Hyun Jeon),이진용(Jin-Yong Lee) 대한지질학회 2016 대한지질학회 학술대회 Vol.2016 No.10

색소침착가려움발진의 유발인자에 따른 임상소견과 재발률

전우석 ( Woo Seok Jeon ),이지현 ( Ji Hyun Lee ),박영민 ( Young Min Park ),이준영 ( Jun Young Lee ) 대한피부과학회 2014 大韓皮膚科學會誌 Vol.52 No.11

Background: Prurigo pigmentosa (PP) is a chronic recurrent dermatosis that occurs in young adults and is characterized by pruritic erythematous macules and papules that leave reticular hyperpigmentation. Although there have been a few comprehensive studies, the clinical characteristics and recurrence rates have not been fully elucidated. Objective: The purpose of this study was to evaluate the clinical findings and recurrence rates according to the factors associated with PP.Methods: We reviewed the medical records, photographs, and histopathological slides of 67 patients who were diagnosed with PP between March 2005 and March 2013. Statistical analysis was performed to compare the recurrence rates between the group without associated factors and the group with associated factors (contact, diet/ weight loss, and sweat, respectively). Results: PP associated with contact showed localized involvement and transverse direction of the lesions; however,the PP lesions associated with diet or weight loss showed diffuse involvement. PP associated with sweat showed a tendency to be distributed in the flexural area and depressed area with longitudinal direction of the lesions. The recurrence rate of the group with no associated factors was 45.7%, while that of the group with associated factors was 33.3%. Within this group, the recurrence rate was 23.1% (3/13) for the contact group, 27.3% (3/11) for the diet/weight loss group, and 50% (4/8) for the sweat group. However, the differences in recurrence rates were not statistically significant. Conclusion: We suspect that there are differences in the clinical characteristics according to the factors associated with PP. Although the differences in recurrence rates according to the factors associated with PP were not statistically significant, we suspect that further research with a larger sample size will show that the differences are in fact present. (Korean J Dermatol 2014;52(11):797∼801)

수술전후의 요추간핵탈출증의 방사선학적 고찰

전우기,한창열 인제대학교 1980 仁濟醫學 Vol.1 No.1

요추핵탄출증의 수술전후의 척추강높이 요천각, 국소적척추만곡등 단순 X선 사진상 변화 소견을 비교 검토하였다. In the great majority of cases with the lower back pain, the lumbar herniated disc is one of the common causes. The plain radiographs of preoperative and postoperative periods were studied in 76 cases which were surgically verified as lumbar herniated disc at Baik Hospital. The following results were obtained : In preoperative plain radiograph, 16.9% of 76 cases revealed no specific abnormlity. The most common positive finding was the straighteing of the lumbar curvature (56.6%). Other common positive finding was a relative narrowing of the intervertebral disc space (46.1% The greatest incidence of preoperative intervertebral disc space was between 0.8cm and 1cm (48.8% of cases) and next 1.1cm.-1.3cm(37.8%) The over-all mean of lumbosacral angle in preoperative plain radiographs was 29.7˚. The greatest incidence of lumbosaral angle was between 31˚ and 40˚ (31.6% of cases) and next 21˚-30˚(30.3%). Study of postoperative(after 1 month-1 year) radiograph i) Postoperative plain radiograph showed the future decrease of disc space in 39 cases(51.3%) than preoperative one. ii) Postoperative lumbosacral angle showed further increase in 35 cases (46%) than preoperative iii) 18.6%(8 cases) of 43 cases with preoperative straightening of lumbar curvature showed the normal lumbar lordosis in postoperative radiograph. iv) 93.9%(31 cases) of 33 cases with preoperative normal lumbar lordosis also showed normal lordosis in postoperative radiograph. v) 85.7%(12 cases) of 14 cases with preoperative local lumbar scoliosis showed no scoliosis of lumbar spines in postoperative radiograph.

IT인력 양성을 위한 현행 정보교육과정의 현황과 개선

전우천(Woo-Chun Jun) 한국정보과학회 2009 정보과학회지 Vol.27 No.1