비산먼지 자동 저감시스템을 이용한 콘크리트 제조업 환경 유지관리 기술

조현우,정윤석,류득현,김윤용,Hyun-Woo Cho,Yoon-Seok Chung,Deuk-Hyun Ryu,Yun-Yong Kim 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 논문집 Vol.27 No.4

Fine dust is a cause of serious ecological problems, and fugitive dust generated from construction sites is a major source of fine dust in Korea. However, at construction sites, including concrete manufacturing industry sites, measurements are rarely made at the fugitive dust generation stage, and passive removal methods are the majority. Therefore, in this study, a fugitive dust measurement method suitable for managing fugitive dust generated during aggregate unloading in the concrete manufacturing industry sites was selected. In addition, the purpose was to analyze the amount of fugitive dust reduction according to the operation of the reduction system by applying the automatic fugitive dust reduction system to the aggregate unloading site. As a result, the reliability of the light scattering method was secured through the comparative measurement of the beta-ray absorption method and the light scattering method, and the light scattering method correction coefficient was calculated and applied to the measured value of the fugitive dust particle mass concentration at the concrete manufacturing industry sites. In addition, the fugitive dust reduction rate according to the operation of the automatic fugitive dust reduction system was derived.

이성분 혼합기체의 동시농축에 관한 연구

조현우,황유석,서성섭 ( Hyun Woo Cho,Yoo Seok Hwang,Sung Sup Suh ) 한국화학공학회 1995 화학공학의이론과응용 Vol.1 No.2

미술대학 조소작업 중 발생하는 분진 및 소음에 대한 노출평가

조현우,윤충식,함승헌,이임규,박지훈,박동진,정진호,염종수,서규진,Cho, Hyun-Woo,Yoon, Chung-Sik,Ham, Seung-Hon,Lee, Lim-Kyu,Park, Ji-Hoon,Park, Dong-Jin,Chung, Jin-Ho,Yeom, Jong-Soo,Seo, Kyu-Jin 한국환경보건학회 2011 한국환경보건학회지 Vol.37 No.4

Objectives: A great number of hazardous agents can be emitted from various types of art-creation in a fine arts college, but little data on exposure assessment has been published. A variety of processes encompassing toxic or non-toxic materials, tools, and components are involved in a sculptor work at a fine art college. The aim of this study was to assess exposure levels to particulates and noise during sculpture classes in a college of fine arts. Methods: Students in sculpture classes participated in this study. Mass, number, and surface area concentrations of particulates, noise level, temperature and relative humidity were monitored by both personal and area sampling during the tasks of metal, wood, and stone sculpting. Results: The number and surface concentration of particulates was the highest in the task of wood sculpting, followed by metal and stone work. The mass concentration of particulates was the highest in stone sculpting (personal GM 3.0 mg/$m^3$, GSD 3.0), followed by wood (personal GM 1.5 mg/$m^3$, GSD 1.8) and metal work (personal GM 0.95 mg/$m^3$, GSD 1.51) in that order. Occupational exposure limits (OEL) for particulates depends on the type of particulate. For wood dust, 86% (six subjects) of the personal samples and all area samples exceeded the Korean OEL for wood dust (1 mg/$m^3$), while 20% (two subjects) among stone sculpting students were exposed above the Korean OEL (10 mg/$m^3$). In contrast, metal sculpting did not exceed the OEL (5 mg/$m^3$). For noise level, metal sculpting students (Leq 95.1 dB(A) in the morning, 85.3 dB(A) in the afternoon) were exposed the most, followed by stone sculpting (88.3 dB(A)), and wood sculpting (84.8 dB(A)) in that order. Compared with the 90 dB(A) of the Korean OEL and 85 dB(A) of the American Conference of Governmental Industrial Hygienists' threshold limit value (ACGIH-TLV) for noise, 100% of the subjects (five subjects) and area samples during metal sculpting in the morning session exceeded both OELs, but only three subjects (60%) exceeded the ACGIH-TLV in the afternoon session. For stone sculpting, 50% (one subject) and 100% (two subjects) exceeded the Korean OEL and ACGIH-TLV, respectively, but the area sample did not exceed either OEL. During wood sculpting, two subjects (40%) exceeded ACGIH TLV. Conclusions: This work evaluated the sculptors' exposure to particulate matter and noise in fine art college, and revealed a poor working environment for the participating students. Effective measures should be supplemented by the administration of colleges.

도심지 공사에서의 소음방지 효과에 관한 연구 - 실시공 사례를 위주로 -

조현우,박정훈,강경인,Cho, Hyun-Woo,Park, Jeong-Hun,Kang, Kyung-In 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.4

The purpose of this study is to analyze the efficiency of the noise reduction measure in the downtown construction. For decades, the life level rise in Korea makes the environmental issues developed the important issues. Specially the noise problems have become the hot issue in the building construction. This study covers the efficiency of the measures, which is used in the construction field to reduce the noise. The case was obtained by Korean E&C company in 2003. It is used as important sources. The results of this study are as follows; the reduction efficiency is higher than that of the old measure. But more efforts are needed to comfort nearby residents.

무공성 Perovskite 표면에서의 $N_2$와 Ar 기체의 흡착

조현우,김정수,이광순,안운선,Hyun-Woo Cho,Jung-Soo Kim,Kwang-Soon Lee,Woon-Sun Ahn 대한화학회 1991 대한화학회지 Vol.35 No.3

Citrate 공침법으로 합성한 여러가지 perovskite형 복합산화물 흡착제에 대한 질소와 아르곤의 흡착등온곡선을 액체질소 온도에서 BET 중량 흡착장치를 사용하여 측정하였다. 여러 universal adsorption isotherm을 이용하여 흡착층의 통계적 두께 t를 구한 후, 측정한 흡착량을 각각의 통계적 두께 t에 대해서 도시하였다. 이 V-t plot으로부터 얻은 t-method 표면적과 BET 표면적을 비교하였다. 그리고 이 도시 결과에 입각해서 여러 universal adsorption isotherm의 적합성을 고찰하였다. Multilayer adsorption isotherms of nitrogen and argon on the perovskite-type mixed oxides, synthesized by a citrate coprecipitation method, are determined at the liquid nitrogen temperature using a gravimetric adsorption apparatus. The volume of the adsorbed gas are plotted against the statistical thickness of the adsorbed layer, calculated from several universal adsorption isotherms one after another. The t-method area obtained from this plot is compared with the BET area and finally the appropriateness of universal adsorption isotherms is then discussed on the basis of the plot.

조도 및 측정거리에 따른 영상 모니터링 시스템의 콘크리트 구조물 균열 인식 특성에 관한 실험적 연구

조현우,윤혁진,박정준,Cho. Hyun-Woo,Yoon. Hyuk-Jin,Park. Jung-Jun 한국방재학회 2014 한국방재학회논문집 Vol.14 No.1

기후변화로 인하여 각종 자연재해 발생빈도가 높아지고 있다. 자연재해에 의한 SOC 시설물의 붕괴를 사전에 감지하고 안전을 확보하기 위해서는 주기적으로 균열, 손상, 파손 등에 대한 점검이 중요하다. 기존의 육안검사를 영상처리기반의 자동화된 균열 감시시스템으로 대체하기 위해, 균열 인식 및 추출 알고리즘 개발에 관한 연구가 많이 수행되고 있다. 그러나 영상기반 균열 모니터링 시스템의 현장 적용을 위해서는 조도와 명암, 촬영 거리 등에 의한 영향을 고려할 필요가 있다. 본 논문에서는 명암과 균열 폭을 모사한 모의 균열시편을 콘크리트 터널 입구에 부착하여, 조도, 카메라와 균열의 사이의 거리, 균열의 명암을 변화시켜 가면서 균열 인식에 미치는 영향을 측정하였다. 실험결과, 측정거리가 멀어질수록 그리고 조도가 감소할수록 식별 가능한 균열의 폭은 증가하였다. 이 결과는 영상 감지 시스템을 현장에 적용할 때 적용할 수 있을 것으로 판단된다. Natural disaster has been increased by climate change. SOC structure needs to check the crack or the damage periodically to prevent the collapse caused by natural disaster and ensure the safety. To replace the visual inspection with automatic inspection system based on image processing, crack recognition algorithms have been developed. However, the effect of illuminance, brightness and measurement distance has to be considered to use the automatic crack inspection system in the field. In this paper, we evaluated the crack width of recognition by changing the illuminance and the measurement distance using several simulated crack specimens described various brightness attached on the concrete tunnel. The result showed that the recognizable crack width grew with the increase of measurement distance and decrease of illuminance. This result can be used as a reference when the image detection system is applied to the field.

척추신경추나의학회지에 수록된 무작위대조임상 연구의 양적, 질적 분석

조현우,이현엽,허광호,황의형,신미숙,신병철,Cho, Hyun-Woo,Lee, Hyeon-Yeop,Heo, Kwang-Ho,Hwang, Eui-Hyoung,Shin, Mi-Suk,Shin, Byung-Cheul 척추신경추나의학회 2012 척추신경추나의학회지 Vol.7 No.2

Objectives: The aim of this study is to assess the quantity and quality of randomized controlled clinical trials (RCTs) published in the journal of Korean Society of Chuna Manual Medicine for Spine and Nerves (KSCMSN). Methods: All relevant RCTs were selected and extracted. Data extract of RCTs from all the articles published in the jounal of KSCMSN up to now, quantity assessment was made on the study design, sample size, intervention, control group and medical condition. of the consolidated standards of reporting trials (CONSORT) check list. Assessment was performed by 2 independent reviewers and disagreement was discussed based on concensus. Results: Among the 276 articles, 10 RCTs were published. 1st articles were published in 2003 and half of RCTs were published in 2011. All RCTs were parallel 2-arm designed. Average sample size was 29.2 per study and 14.6 per arm. Main intervention was consisted as acupuncture 40%, pharmacopuncture 30% and Chuna 30%. Average of adequacy of CONSORT check list was 10.3% and overall reports were insufficient. Conclusions: Though RCTs published in jounal of KSCMSN were increasing, the quality remains low. KSCMSN should make a effort to follow the CONSORT statement and improve the quantity and quality of studies.

SOC 시설물 균열인식을 위한 영상분석 파라미터 연구

조현우,윤혁진,김정석,윤희택,Cho. Hyun-Woo,Yoon. Hyuk-Jin,Kim. Jung-Seok,Yoon. Hee-Taek 한국방재학회 2014 한국방재학회 학술발표대회논문집 Vol.2014 No.1

그동안 우리나라는 화산재해에 대해 비교적 안전한 지역으로 인식되고 있었으나, 최근 백두산 지역의 다양한 화산분화 전조현상 발생 등 화산재해 위험성을 제기하는 전문가의 의견이 증가하고 있다. 이에 본 연구에서는 향후 발생가능한 화산재해에 대해 신속 정확하게 대응하기 위한 공간정보 기반의 화산재해대응시스템 개발방안을 제시하였으며, 실제 파일럿 시스템을 개발하여 상용화 시스템 개발을 위한 기반을 마련하였다. 향후 화산재해대응시스템이 소방방재청 국가재난관리시스템(NDMS) 체계에 탑재되기까지는 추가적인 연구 및 시스템 보완이 필요하나, 해당 시스템이 방재업무에 실용화 된다면 향후 백두산을 비롯하여 우리나라 인근지역에서 발생하는 화산재해로 인한 피해를 최소화 할 수 있음은 물론, 인도네시아를 비롯한 중남미 지역 등 화산재해발생 국가들까지의 수출도 가능할 것으로 기대된다.

서울시 터널 내 방음벽 설치가 입자상 물질 농도 및 소음 수준에 미치는 영향

조현우,이지연,리우시아오산,이기영,Cho, Hyun-Woo,Lee, Ji-Yeon,Liu, Xiaoshan,Lee, Ki-Young 한국환경보건학회 2010 한국환경보건학회지 Vol.36 No.5

The Seoul metropolitan government has installed soundproofing walls in road tunnels to improve the tunnel environment for pedestrians. To evaluate the efficiency of these soundproofing walls, we measured noise levels and concentrations of $PM_{2.5}$ and ultrafine particles (UFP) in tunnels with or without these walls. Although noise and UFP levels were significantly lower in the tunnels with soundproofing walls, $PM_{2.5}$ levels were significantly higher: but were significantly lowered by use of a ventilation system. When $PM_{2.5}$ and noise levels were simultaneously measured in a tunnel with soundproofing wall, noise level was significantly reduced but $PM_{2.5}$ level was significantly higher. It is concluded that the soundproofing wall can protect pedestrians from noise, but not PM. Installation of a ventilation system is recommended for protection of pedestrians in tunnels with soundproofing walls.

말의 열충격 단백질(heat shock proteins)의 특성 구명과 운동 후 유전자의 발현 분석

조현우(Hyun-Woo Cho),박정웅(Jeong-Woong Park),최재영(Jae-Young Choi),조현우(Jae-Young Choi),시바 쿠마르(Sivakumar S),김남영(Nam-Young Kim),신택순(Teak-Soon Shin),조성근(Seong-Keun Cho),김병우(Byeong-Woo Kim),조병욱(Byung-Wook Cho) 한국생명과학회 2014 생명과학회지 Vol.24 No.2

본 연구의 목적은 말의 열충격 단백질 유전자의 특성을 구명하고 말의 각 조직과 운동 전과 후 혈액에서 열충격 단백질 유전자의 발현량을 분석함에 있다. 이전의 연구를 통해, 대표적인 경주마인 더러브렛의 혈액과 골격근에서 운동 전, 후 RNA-sequencing을 통해 차등발현유전자 분석을 실시하고, 본 연구를 위해 운동 전과 후에 차등 발현된 유전자 중, 열충격 단백질 유전자(HspH1, Hsp90α, Hsp70)를 선택하였다. 세 개의 열충격 단백질 유전자는 각각의 혈액이나 근육에서 운동 전에 비해 후에 발현이 증가된 것으로 확인됐다. 본 연구팀은 선정된 유전자에 대한 검증과 분석을 위해, 말의 조직별 RT-PCR 분석과 운동시간별 백혈구에서 real time qPCR 분석을 실시하였다. 그 결과 말의 각 조직(갑상선, 결장, 골격근, 맹장, 신장, 심장, 척수, 폐)에서 세 개의 열충격 단백질 유전자 mRNA가 모두 존재함을 알 수 있었다. 또한, 말의 운동 시간 별 혈액에서 mRNA를 추출하여 열충격 단백질의 운동 시간에 따른 발현 양상 분석을 실시한 결과, 운동 전에 비해 운동 120분 후 열충격 단백질 유전자의 발현량이 증가함을 확인하였다. 이러한 결과는 인간과 다른 동물 실험의 결과와 일치하며, 열충격 단백질 유전자 전사 조절 기작이 종간에 보존이 되어왔음을 시사한다. 또한, 운동에 따른 열충격 단백질 유전자의 발현 양상과 운동 수행 및 회복 기작간의 상관관계에 대한 추가적인 연구가 필요함을 제안하는 바이다. The purpose of this study was to characterize equine heat-shock protein (Hsp) genes and analyze their expression pattern in various horse tissues and blood leukocytes after exercise. In a previous study, RNA sequencing of blood and skeletal muscles of thoroughbreds before and after exercise was performed using differently expressed gene (DEG) analysis. Three Hsp genes (HspH1, Hsp90α and Hsp70) were selected by DEG analysis and were found to be differentially expressed in either blood or muscle. To validate and extend previous observations on these genes, we performed RT-PCR analyses of horse tissue as well as real-time qPCR analyses of blood leukocytes after exercise. mRNA expression of these Hsp genes was found to be ubiquitous in the analyzed tissues (including thyroid, colon, skeletal muscle, cecum, kidney, spinal cord, heart, and lung). In addition, Hsp mRNA expression of these genes in extracted whole blood increased after 120 minutes of exercise compared to the baseline condition. These results are in agreement with the results of human and other experimental animals, suggesting that regulatory mechanisms that are responsible for upregulation of Hsp gene transcription may be conserved among species. Further investigations to correlate Hsp gene expression patterns with athletic performance or recovery processes after exercise are warranted.