Study of face mask filtration efficiency to prevent fine dust to secure people's right to health

권우택,정민재,김범수,이우식,권이승 한국냄새환경학회 2020 실내환경 및 냄새 학회지 Vol.19 No.2

In this study, we evaluated the filtering effect of the fine dust mask. Our objective research has secured credibility in the private sector. The performance of domestic fine dust masks is evaluated by three dust collection efficiencies, inspiratory resistance, and leakage rate according to KF grade in the health mask standard guidelines issued by the Ministry of Food and Drug Safety. Based on this, eight types of fine dust masks were evaluated for dust collection efficiency and face intake resistance. All masks showed good performance as the collection efficiency was 90%. The higher the KF grade, the higher the collection efficiency, but the inspiratory resistance had no correlation with the grade. According to the manufacturer's operation method, masks below the standard value may be distributed. Masks that are currently on the market have shown results that can be trusted. However, we hope that the system will be improved to validate whether the masks that meet the threshold are still being distributed.

지하상가 실내외 및 지하철의 온도와 습도에 따른 Formaldehyde 거동 ( 2 ) ( Behavior of Formaldehyde Concentration by Temperature and Humidity of Indoor and Outdoor in Underground Shopping Center and Subway ( 2 ) )

권우택 대한환경위생공학회 1994 대한환경위생공학회지 Vol.9 No.1

초등학교 세면시설의 적정 설치에 관한 연구

권우택,이우식,Kwon, Woo-Taeg,Lee, Woo-Sik 한국환경보건학회 2011 한국환경보건학회지 Vol.37 No.6

Objectives: Students in elementary schools usually wash their hands in a washstand. However, little attention is paid to the washstand itself. Today, the importance of personal sanitation and hygiene is greatly emphasized. Therefore students' parents and the public are growing increasingly interested in accessibility to washstands by elementary school students in their schools. Methods: With respect to this study, a survey of students and teachers inelementary schools was performed on the installation of washstands in order to determine the proper number of washstands per school. Results: The results show that 1.1 boys (per class) need a washstand, while 1.8 girls (per class) do so in order to maintain a 50% level of crowdedness. By of the regression equation, to maintain 50% congestion (50% of all students feel congestion) there should be 18.5 boys, and the 15.76 girls per washstand. Table 3 is based on the above results, the number of students per washstand (x) and congestion (y), separated by gender according to the results of regression analysis, the correlation of male models in the linear regression analysis and correlation of girls in the regression equation can be obtained. The linear regression fit of less than 0.7 determines that the coefficients of determination are 0.5399 and 0.4195, respectively. Significance was much smaller. Also, according to the simulation using the diffusion model, with 29 students per class more than one washstand should be provided in a school. Girls (per class) need 0.7 more washstands than boys (per class). Conclusions: More washstand facilities for girls than boys are needed. If the target is based on school class size two washstands should be installed. Finally, guidelines and/or standards in the Schools Health Act of Korea forin elementary school washstands is considerably needed.

대학원생을 위한 연구윤리 수강메뉴얼

권우택 한국유통학회 2022 International Forum on Business Convergence (IFBC) Vol.2022 No.-

성남시 대기부유분진중 호흡성 분진에서 중금속의 농도 및 입경분포 ( The Heavy Metals and Size Distribution of Respirable Suspended Particulate Matter at Sungnam City )

권우택,유영식 대한환경위생공학회 1994 대한환경위생공학회지 Vol.9 No.1

복합악취 숙련도 평가를 위한 시험용 시료로서 현장시료의 타당성과 이를 이용한 숙련도 평가

권우택,김선태,이석준,홍석영,김명옥,정인영,한진석,류희욱 한국냄새환경학회 2013 실내환경 및 냄새 학회지 Vol.12 No.3

본 연구에서는 악취숙련도 시험을 위한 PTM 물질로 현장시료의 적용가능성을 평가하기 위하여 하수처리장에 채취한 현장시료의 안정성과 채취 균질성을 조사하였다. 또한 현장시료를 PTM으로 사용하여 71개 악취검사기관의 공기희석관능법의 숙련도 시험을 실시하였다. 다양한 설정값(참여기관 또는 기준기관의 악취지수 평균값이나 중위수)를 기준으로 3가지 Z-score 평가법(표준편차 이용한 Z-score, Robust 표준편차를 이용한 Z-score, 목표표준편차를 이용한 Z-score)으로 숙련도의 통계적 분석을 하였다. 하수처리장 농축조에서 채취한 현장시료는 2일 동안 희석배수의 변화 없이 안정적이었고, 참여기관을 4 그룹으로 나누어 순차적으로 채취한 현장시료가 균질한 것으로 평가되었다. 이는 현장악취시료가 악취 숙련도 평가를 위한 PTM 물질로 적용 가능함을 의미한다. 숙련도 시험결과의 통계적 분석을 통해 참여기관의 숙련도 만족비율은 Z-score 평가법이나 설정값의 기준(참여기관 또는 참고기관으로 선택한 3개 대학의 악취지수 평균값이나 중위수) 보다는 목표표준편차(S*ref)값에 의존하였다. 숙련도 만족비율은 S*ref 값이 증가함에 따라 증가하였으며, PTM 시료의 분석결과에 대한 변동계수(CV) 0.13에 해당하는 목표표준편차값에서 숙련도 만족비율은 약 93∼96% 수준이었다. This study was carried out to provide the stability and the feasibility of field odor samples as proficiency testing materials (PTMs) for air dilution olfactory method. Seven-one olfactometry laboratories participated in the proficiency testing. Interlaboratory comparison was carried out by using a field odor samples taken from a sewage thickener as PTMs. Statistics for quantitative results were calculated using three Z-score methods (standard deviation Z-score, Robust Z-score, target standard deviation Z-score) based on either average or median for the participants and three-reference laboratories results. The dilution to threshold of the field samples was constant for 2 days. The difference of dilution to threshold between the samples taken by all of participants was not statistically significant. It means that the field odor sample is feasible as one of PTMs. Satisfactory performance of participants depend on target standard deviation (S*ref) rather than on Z-scores and the creteria of assigned values such as median and average. The satisfactory performance increased with increasin S*ref, and It was 93-96% of participants at a coefficient of variation of .0.13.

新興 水原池의 富營養化 防止에 對한 硏究

권우택 서울保健大學 1992 論文集 Vol.12 No.1

A hypolimnetic aeration system(An intermittent air lifter) is experimentally manufactured and installed to prevent the eutrophication and the water pollution of the water source area of shin Hung reservoir, as well as the effect of operation and the feasibility of the system are investigated, consequently estimating number of hypolimnetic aeration system necessary to this water source area, and the result of analysis is as follows; 1. The results of the water quality test and the mud sediment test performed for evaluation of the effect of the hypolimnetic aeration system before the operation and after the operation, the hypolimnetic aeration system proved to be Successful. 2. The appropriate number of the hypolimnetic aeration system required for preventing the eutrophication is 6 units. 3. Hypolimnetic aeration system and aluminum sulfate were reasonable method to restore the eutrophic state of Shin Hung reservoir.

태양광(太陽光) 산업(産業)에서 발생(發生)하는 Si/SiC 혼합물(混合物)의 소결특성(燒結特性) 연구(硏究)

권우택,김수룡,김영희,이윤주,김종일,이현재,오세천,Kwon, Woo Teck,Kim, Soo Ryong,Kim, Younghee,Lee, Yoon Joo,Kim, Jong Il,Lee, Hyun Jae,Oh, Sea Cheon 한국자원리싸이클링학회 2013 資源 리싸이클링 Vol.22 No.3

태양광 산업에서 폐기물로 발생하는 Si/SiC 혼합슬러지를 재활용하는 것은 환경과 경제적인 측면에서 중요하다. 이러한 재활용을 위해서 Si/SiC 혼합물의 소결특성을 분석하는 것이 필요하다. 본 연구에서는 SiC함량에 따른 소결특성을 살펴보기 위해서 공기분급기를 이용하여 Si/SiC 혼합물에서 SiC 함량을 변화시켰다. SiC 함량이 변화된 Si/SiC 혼합물에 카본블랙, 점토 및 수산화알루미늄을 첨가하여 소결하였다. Si/SiC 혼합물의 특성분석 및 첨가제 변화에 따른 Si/SiC 혼합물 소결체의 특성변화를 SEM, XRD, 입도분석 및 겉보기 밀도변화를 측정하여 분석하였다. SEM 및 입도분석결과, SiC 95% 시료의 경우에는 원시료 및 SiC 75% 시료와 비교하여 1 ${\mu}m$ 크기 이하의 미립입자가 크게 감소하여 공기분급을 통한 미세입자 제거가 SiC 함량 제어에 효과가 있음을 확인할 수 있었다. 수산화알루미늄을 첨가함에 따라서 ${\beta}$-Cristobalite 가 감소하고 mullite 생성량이 증가하였으며, 카본블랙의 첨가가 소결특성 향상에 영향을 주는 것을 확인하였다. The recycling of the Si/SiC mixture sludge obtained from solar cell industry is very significant, environmentally and economically. The sintering characteristics of Si/SiC mixture sludge was studied for the purpose of recycling. In this study, to understand sintering behavior, SiC content in the Si/SiC mixture was controlled using an air separator. Various Si/SiC mixtures having different SiC contents were sintered using carbon black, clay and aluminum hydroxide as sintering aids. Physical properties of Si/SiC mixture and sintered bodies have been characterized using SEM, XRD, particle size analyzer and apparent density measurement. SEM and particle size analysis result confirmed that the fine particles less than 1 ${\mu}m$ decreased or removed more effectively through the air separator in the case of 95% SiC sample compared than the case of 75% SiC sample or original SiC sample. Further, with addition of the Aluminum Hydroxide, ${\beta}$-cristobalite phase gradually decreased while mullite phase gradually increased. The addition of the carbon black improved the sintering characteristics.

A Study on the Actual Condition of Microplastic Contamination in Mackerel

권우택,김귀성,이우식,권이승,나영아 (사)한국조리학회 2018 한국조리학회지 Vol.24 No.2

The purpose of this study is to investigate the contamination level of micro plastics in Korean mackerel and to investigate the detection method of micro plastics in fish. This study analyzed the detection and composition of micro plastics using natural mackerel and wild mackerel. 30% hydrogen peroxide and surfactant were added to GF/C filter paper in order to detect micro plastics in the sea. If micro plastics are exposed to the ocean for a long time, accumulation of heavy metals in the water will make pollutant bioaccumulation more serious. Microscopic consequences The risk to human health of plastics has already been studied by many researchers and the risks to human health already caused by marine microorganisms and zooplankton are becoming clear. The conclusion of this study is that there is a difference between the length and height of the mackerel when it is cooked from the standpoint of food in terms of practical implications. The conclusion of this study is that the probability of micro-plastic-contaminated mackerel to reach and be consumed by end-consumers is low in academic implications. Residual contaminants adsorbed on micro plastics are absorbed by digestive organs and cause disruption, and further research on micro plastics is needed in the future.

Sliding Arc Plasma를 이용한 석유공장에서의 BTX 처리효율에 관한 연구

권우택,권이승,이우식 한국화재소방학회 2015 한국화재소방학회논문지 Vol.29 No.6

This research examines the removal efficiency of benzene, toluene, xylene (BTX) and total volatile organic compounds(TVOCs) by flowing VOCs, which are generated at a petrochemical complex in the Ulsan area, in a sliding arc plasma(SAP) reactor. The SAP reactor process is composed of 5 steps and the analysis was conducted using a BTX detector andTVOC measuring instrument. The removal efficiency of BTX was better at high concentration than at low concentrationand the emitted TVOC concentration increased in later steps of the reactor. In addition, the removal efficiency improved,as the flow velocity increased. The maximum permissible concentration of TVOCs in the first step was about 481 ppmand showed over 94.83% efficiency when it was operated in the 2nd step at concentrations beyond 481 ppm. Therefore,there are many factors for improving the removal efficiency of SAP reactors at low concentration and measures should beprepared according to the application method for the various types of industrial reactors. 본 연구는 울산소재 석유공장의 건조시설에서 발생하는 가스를 스크러버(Scrubber)로 최종 처리하여 배출되는 저 농도의 유해가스와 산 처리 시설에서 발생되는 고 농도로 발생하는 유해가스를 대상으로 연구하였다. 공정별로 벤젠(Benzene), 톨루엔(Toluene), 자일렌(Xylene) 및 총휘발성유기화합물(TVOCs)을 대상으로 측정하였으며 농도 측정은TVOCs 측정기와 GC-MSD를 이용하여 SAP 전 · 후단의 TVOCs와 BTX의 농도를 측정, 분석하여 제거효율을 평가하였고, SAP 반응기는 5 단계로 구성하여 실험을 수행하였다. 슬라이딩 아크 프라즈마(slidind arc plasma) 반응기의 단수별에 따른 TVOCs 농도 변화는 유입 TVOCs 농도의 변화에 따른 처리효율 결과 481 ppm 미만에서 94.83%, 481ppm 이상일 경우에는 1단에서는 89.07% 2단에서는 약 91% 이상으로 처리되는 것을 확인할 수 있었다. 본 연구의 결과는 석유화학공정 및 제조시설에서 SAP 공정을 통한 VOCs 제거에 대한 연구 및 기술개발의 기초가 되어 VOCs의보다 안정적인 처리와 다양한 기술개발에 효과가 있을 것으로 기대해 본다.