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홍종우,최재순,Hong, Jong woo,Choi, Jae Soon 대한토목학회 2015 대한토목학회논문집 Vol.35 No.6
H-pile과 목재 토류판을 사용하는 흙막이 공법은 오랜 기간 굴착공사에서 사용되어 온 공법이지만 H-pile 사이의 간격이 일정치 않아 규격화된 목재를 절단하거나 덧대기 공정이 추가되는 문제점이 있다. 또한, 시방규정상 3회 재사용을 위한 목재 회수시 안전사고의 위험이 따르게 되며 이러한 이유로 목재를 회수치 않고 지중에 매몰하여 여러 차례 방송매체의 지적을 받은 바 있다. 이 연구에서는 이상의 문제점을 보완하기 위하여 기존의 목재 토류판을 대신하여 강재 요소를 적용하는 방안을 제시하였다. 강재 흙막이 구조체는 자유 확폭과 개별 흙막이 구조체를 연결하는 커넥터를 통해 시공 편의성 및 재활용을 위한 회수가 가능한 것이 특징이다. 또한, 해체 시 커넥터를 통한 구조체간의 연결성으로 지중인력투입없이 해체가 가능하다. 이러한 흙막이 구조체의 강도특성을 분석하기 위해 UTM장비를 사용하여 휨 강성시험, 반복 사용의 능력을 확인하기위한 피로 강도시험, 그리고, 흙막이 구조체의 회수 시 연결부 구조체의 성능을 확인하기위한 인장 강도시험을 수행하였다. 또한, 장점으로 부각된 내용이 현장에서 실제 가능한지 여부를 확인하기 위한 현장시험과 다양한 지반조건에 따른 수치해석을 통해 현장 적용성을 평가하였다. 연구결과, 구조적 특성뿐만 아니라 설치 및 해체시의 시공 편의성이 매우 탁월한 것으로 나타났으며 향후 구조체의 재사용과 함께 시공 경제성 증진에도 크게 기여할 것으로 판단된다. 특히, 다단굴착시 굴착배면에 흙막이 구조체가 밀착되어 설치가 가능한 점은 기존 공법에서 지적되어 온 배면지반의 뒷채움 불량이 발생할 여지가 없어 시공 및 시공 후 시설물의 안전성 증진에 크게 기여할 수 있을 것으로 판단된다. It has been known that the conventional retaining wall system with timber lagging and H pile has several problems such as the irregular gap between H-piles, cutting or adding to standard timber, back fill over first step excavation, and especially break-down accident at the disjoint of wall system. In the practical excavation, these problems may lead to worker's accident and the inefficiency of construction economy. To solve the above problems, a new method using prefabricated retaining wall was proposed and verified. The characteristics of the new method is to replace timber wall as free-sliding steel-lagging and connector. To check its verification and application, laboratory tests such as bending strength, tensile strength, and fatigue strength were carried out. Also, a pilot test in the field and numerical simulations under various ground conditions were performed. From the researches, it is found that the prefabricated retaining wall plate can be superior to the conventional timber lagging plate in the strength. It is also found that the proposed methods can be effective in the reuse of retaining wall plate and safe in the disjoint of wall system. Finally, it is desired that the proposed method will be effective in the reduction of the imported timbers and helpful in the safety of retaining wall construction.
홍종우,최성협 인제대학교 1990 仁濟醫學 Vol.11 No.2
요류 측정술을 이용하여 전립선 비대증 환자 40례에서 경요도 전립선 절제술후 치료 효과를 평가하여 보고한다. Uroflowmetry has been proposed as a non-invasive screening test and may be used to reveal lower urinary tract dysfunctions, such as benign prostatic hyperplasia, urethral stricture and neurogenic bladder. We tested 40 patient of benign prostatic hyperplasia (BPH) diagnosed with clinical manifestations, IVP and cystoscopy. Group 1 including 15 patients performed both preoperative and postoperative uroflowmetry. Group 2 including 25 patients shown acute urinary retention preoperatively, performed only postoperative uroflowmetry. The results were obtained as follows. 1.In group 1, average preoperative maximum flow rate (MFR) was 7.2 cc/sec and postoperative MFR was 20.1 cc/sec (P<0.01). On flow rate normogram, preoperative MFR of all patients was below -2 standard deviations (SD) and average MFR was -3.1 SD. In postoperative MFR, below -2 SD values showed in 3 patient, -1 SD ~-2 SD in 6, -1 SD ~ mean in 4, above mean values in 2 and average MFR was -1.3 SD. 2.In Group 2, postoperative average MFR was 22.3cc/sec, below -2 SD values showed in 6 patients. -2 SD∼ -1 SD in 5, -1 SD - mean in 8, above mean values in 6 and average MFR was -0.93 SD. 3.MFR values of group 1 increased an average of 2.8 SD in each patient and 80% of patients were improved in uroflowmetry after transurethral resection of prostate (TURP). 4.If MFR of acute urinary retention was below -2 SD in group 2, 76% of patients were improved in uroflowmetry after TURP.
우리나라 COVID-19 확진자 직업 분포와 노동자 보호 방안
홍종우,최소현,박정임 한국산업보건학회 2020 한국산업보건학회지 Vol.30 No.3
Objectives: Everyone has been affected in some way by the COVID-19 pandemic, while some workers face threats to their health due to their jobs as well as worries about spreading the virus to intimate family members. With these concerns in mind, this study aims to identify occupations more vulnerable to COVID-19 and suggests the necessity of providing proper control measures against the risks in a timely manner in Korea. Methods: Daily briefing reports by the Korea Centers for Disease Control and Prevention (KCDC) were compiled (n=120) for between January 20 and May 31, 2020. A total of 11,486 confirmed cases were included, which were sorted by occasion, area, and occupation. Among them, 2,411 cases were classified with specific occasions and/or areas of infection, while only 544 cases were determined with identifiable occupations. Guidelines for biological hazard management and COVID-19 guidelines for workplaces from domestic and international bodies were enlisted and compared. Results: It is unsurprising to find that healthcare professionals are experiencing the most immediate threat from COVID-19. In addition, service workers with face-to-face practices or indirect contact are also facing high risks. Religion facilities and eating places (dining, drinking bar, café, etc., 13%) follow. Guidelines and manuals for biological hazards are still lacking in Korea compared to the US and EU. Workplace manuals for managing COVID-19 are neither as comprehensive as the approaches of NIOSH’s hierarchy of controls nor inclusive enough for minimizing secondary or tertiary suffering. Conclusions: The COVID-19 crisis is still ongoing and there is no doubt there will be more such events in the future. This analysis suggests that occupational health professionals, amid a pandemic including COVID-19, are urged to anticipate emerging risks related to all sorts of occupations, identify vulnerable workers and working environments, and plan and take actions to protect workers’ health.