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사상자 통계자료를 활용한 건축물 화재 위험성 분석에 관한 연구
진승현 ( Jin¸ Seung-hyeon ),김혜원 ( Kim¸ Hye-won ),구인혁 ( Koo¸ In-hyuk ),권영진 ( Kwon¸ Young-jin ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
The purpose of evaluating the fire risk of a building is to predict damage or loss of life and property in unspecified circumstances and to minimize expected damage. The fire risk assessment for buildings in Korea analyzes fire risk according to performance-oriented design under the Enforcement Decree of the Fire Facilities Act and the Fire Causing Index under the Enforcement Decree of the Multi-Use Business Act. Fire risk analysis is mainly conducted by using fire statistics or analyzing the results of safety inspections of buildings. In the case of fire statistics, it is necessary to analyze the fire risk in consideration of the degree of fire damage in each number of fires, as all fires received by the fire department are collected. In addition, it is necessary to devise fire safety measures for buildings by predicting the number of casualties that may occur due to fires in each building. Accordingly, this study aims to analyze the characteristics of casualties by building use using the number of fires judged to have grown.
Night shiftwork and prostate-specific antigen level in a tire manufacturing factory
Seunghyeon Cho,Won-Ju Park,WonYang Kang,Dae-Young Lim,Suwhan Kim,Jai-Dong Moon 대한직업환경의학회 2019 대한직업환경의학회지 Vol.31 No.-
Background: Recent studies suggest that night shiftwork may increase the risk of prostate cancer and elevated serum prostate-specific antigen (PSA) level. The purpose of this study was to verify whether rotating night shiftwork affects serum PSA level. Methods: This study included 3,195 male production workers who work in a large tire manufacturing factory. Serum PSA levels were measured and the data on related factors were obtained. Results: The mean serum PSA level was 0.98 ± 0.79 ng/mL. PSA levels were significantly lower in the younger age group, the obese group, and regular exercise group. PSA levels were lower in night shift workers (n = 2,832) compared to day workers (n = 363), but the difference was not statistically significant. Conclusions: Unlike previous studies, we did not find any evidence that night shiftwork results in an increase in serum PSA levels. Further research and consistent results are needed to elucidate the association between night shiftwork and the effect on the prostate.
Unanticipated Difficult Intubation in Patient with Undiagnosed Posterior Glottic Stenosis
Seunghyeon Lee,Misoon Lee,Bon Sung Koo,Yang Hoon Chung 순천향대학교 순천향의학연구소 2019 Journal of Soonchunhyang Medical Science Vol.25 No.1
Posterior glottic stenosis (PGS) is frequently caused by prolonged intubation complications, which may limit the movement of the vocal cords and obstruct airway obstruction. Despite of a life-threatening condition, it might be overlooked in asymptomatic individual. A 63-year-old female was scheduled for arthroscopic rotator cuff repair. The patient had experienced 2 times of intubation and organophosphate poisoning for suicide. Both of 7.0- and 6.5-mm inner diameter endotracheal tubes could not be passed vocal cords. After two failed attempts at intubation, adhesion of posterior part of vocal cord was revealed. We stopped the tracheal intubation and called the otolaryngologist, and adhesiolysis was performed under direct laryngosope. Thereafter, endotracheal intubation was performed successfully with 6.5-mm endotracheal tube.
High Performance of NanoCellulose/Nanochitin Coating Polypropylene Film for Food Packaging Materials
Seunghyeon LEE,Dongsoo HWANG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
In food packaging industry, it is important to possess barrier properties which prevent oxygen gas and water vapor. In general, aluminum coated polypropylene films are used because aluminum has a good gas barrier ability. However, this film is difficult to reuse and generate harmful particle when finally incinerated. In this study, we made a renewable food packaging film using the two most abundant biorenewable resources, cellulose and chitin. The structure of this film is simply made by stacking TEMPO cellulose nanofibers and Chitin nanowhiskers on polypropylene, and coating layers can sufficiently prevent oxygen gas and water vapor permeation. Compared with pristine pp, oxygen gas and water vapor permeability were significantly reduced from 1118 to 13.10㏄ m-2day-1 and from 2.43 to 2.13g m-2day-1, respectively. Furthermore, it has high transparency and antibacterial effect, so it can be expected as a new renewable food packaging material.
Seunghyeon Cho,Won-Ju Park,Wonyang Kang,Hyeong-Min Lim,Ji-Sung Ahn,Dae-Young Lim,Jai-Dong Moon 대한직업환경의학회 2019 대한직업환경의학회지 Vol.31 No.-
Background: Dehydroepiandrosterone sulfate (DHEAS) is an endogenous steroid hormone produced by the adrenal gland. DHEAS has been suggested to play a protective role against psychosocial stress. The aim of this study was to investigate the association between job-related stress and blood concentrations of DHEAS according to occupational stress factors among female nurses. Methods: A cross-sectional study was conducted among 118 premenopausal nurses from 4 departments (operating room, emergency room [ER], intensive care unit, and ward) of a university hospital. Participants were all rotating night shift workers who have worked for over a year and mean age of 33.5 ± 4.8 years. Data from structured questionnaires including the Korean Occupational Stress Score, Beck Depression Inventory (BDI), Beck Anxiety Inventory (BAI), and Pittsburgh Sleep Quality Index (PSQI) were used. Results: In the high job-related stressor group, scores of BDI, BAI, and PSQI were significantly higher than low-stressor group. ER nurses had relatively more work-burden related stressors, but they had significantly lower levels of anxiety and depression than other groups. And, ER nurses showed higher levels of DHEAS than the other department nurses. The differences were significant (p = 0.003). Additionally, there was a statistically significant difference even after adjusting for factors that could affect level of DHEAS, such as age, body mass index, drinking, and physical activity (p = 0.039). Conclusions: This result suggests the possibility that DHEAS may play a role as a marker of proper stress management. The capacity to secrete DHEAS is not simply due to workload or job stressor but could be determined depending on how individuals and groups deal with and resolve stress. Proper resolution of stress may affect positive hormone secretion.
Current Research on Conducting Polymer-Carbon Nanocomposites for Bioengineering Applications
( Seunghyeon Lee ),( Sang Kyu Lee ),( Daseul Jang ),( Bong Sup Shim ) 한국고무학회 2017 엘라스토머 및 콤포지트 Vol.52 No.1
Conducting polymers and carbon nanomaterials offer a wide range of applications because of their unique soft conducting properties. Specifically, these conducting polymer-carbon nanocomposites have recently been utilized in bioengineering applications, partly because of their improved biocompatibility compared to conventional conducting materials such as metals and ceramics. Based on the assumption that these composites offer an important application potential as functional materials for biomedical devices or even as biomaterials, this review surveys the recent research trends on conducting polymers-carbon nanocomposites, focusing on bioengineering applications such as polyaniline (PANI), poly(3,4-ethylenedioxythiophene) or PEDOT, polypyrrole (Ppy), and carbon nanotubes and graphene.