• 제목/요약/키워드: Smoke Control Influence factor

검색결과 10건 처리시간 0.026초

초고층 건물의 제연영향요소에 따른 수직피난공간 압력분포 시뮬레이션 (A Study on the Pressure Difference of Smoke Control Influence Factor in the Super High-rise Building)

  • 최승혁;이동윤;전현도;박진철
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2009년도 하계학술발표대회 논문집
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    • pp.130-135
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    • 2009
  • These days, the super high-rise buildings construction plans are increased in Korea. But the stack effect in the super high-rise building interrupts the smoke control system's operation because of pressure difference, so it is more dangerous than the general building when firing. Therefore it needs to study about the pressure difference in the super high-rise buildings. We research the smoke control influence factor in the super high-rise building. Reflecting the influence factor, the simulation is practiced the case by case.

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직접분사식 소형 디젤엔진의 배기배출물에 대한 인자분석적 고찰 (Factor Analysis on Exhaust Gas Emissions of Small DI Diesel Engine)

  • 장세호;김영식
    • 수산해양교육연구
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    • 제29권2호
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    • pp.586-592
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    • 2017
  • This study analyzed the effect of four control factors, RPM, load, EGR rate and cooling water temperature on the exhaust emissions of the small DI diesel engine. The amount of NOx and smoke emissions were measured through experiments for three levels of four control factors according to orthogonal array table, and the effect of four factors on NOx and smoke emissions was analyzed quantitatively. The main results obtained in this study are summarized as follows: 1. RPM, load and EGR rate have a great influence on NOx and smoke emissions, and the effect of cooling water temperature is negligible. 2. As RPM and load increases NOx emission increases and decreases sharply as the EGR rate increases. 3. Smoke emission decreases or increases randomly according to RPM and load, but increases sharply in proportion to the EGR rate. 4. EGR rate has the greatest effect on NOx and smoke emissions by more than 60% of contribution to variance, especially in the case of NOx emission, EGR rate represents a significant result even under the confidence level of 99% on ANOVA.

백서에 식립한 치과용 임플란트의 골유착에 흡연이 미치는 영향 (INFLUENCE OF CIGARETTE SMOKE INHALATION ON DENTAL IMPLANT OSSEOINTEGRATION IN THE RAT)

  • 김세호;김성민;김지혁;박영욱;박찬진;정기명;이석근
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • 제31권4호
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    • pp.291-299
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    • 2005
  • Objectives : It is well known that cigarette smoking is harzardous to the osseointegration of dental implant, due to the impaired wound healing accompanied by reduced alveolar bone density. The aim of this study is to evaluate the influence of cigarette smoke on the implant osseointegration by the time factor consideration. Materials and methods : Twenty-four male Spraque-Dawley rats (8 weeks, weighting 200 to 250g) were used in this study. In the experimental group, 13 rats were exposed to cigarette smoke, 8 minutes per day during 6 weeks, and 12 rats in the control group were not exposed at any time. RBM (Resorbed blasting media) surfaced implant (diameter 3.3mm, length 5.0mm, AVANA Co., Korea) was placed in the right femur of each rat. Each implant with surrounding bone was prepared with microtome (cutting band 0.2mm$^{(R)}$, EXAKT Co., Germany) after 1 day, 2, 4, 8 and 12 weeks and stained with toluidine blue (1%). Another clinical investigation of each implant was also done at each evaluation time. Results : Clinical investigation around implant fixture showed that there were no significant differences between the control and experimental group. Microscopic observation around implant fixture showed that there were significant differences between the control and experimental group at the initial stage after implant fixture installation. Experimental group showed a decreased bone to implant contact within 4 weeks compared to control group, but showed similar characteristics after 4 weeks. Conclusion : Smoking inhalation effect on the dental implant showed the impaired wound healing by vasoconstriction and decreased intramedullary blood flow at initial stage of osseointegration. This experimental results can be clinically useful to the implant surgery of smoking patients.

기류 가시화기법을 이용한 방해기류 방향과 속도에 따른 푸쉬풀 후드 효율 평가 (Evaluation of Capture Efficiencies of Push-Pull Hood Systems by Cross Draft Directions and Velocities Using Smoke Visualization Technique)

  • 송세욱;김태형;하현철;강호경
    • 한국산업보건학회지
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    • 제15권1호
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    • pp.36-44
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    • 2005
  • A push pull hood system is frequently applied to control contaminants evaporated from an open surface tank in recent years. Efficiency of push pull hood system is affected by various parameters, such as cross draft, vessel shapes, size of tanks surface, liquid temperature, and so on. Among these, velocity of cross draft might be one of the most influencing factor for determining the ventilation efficiency. To take account of the effect of cross draft velocities over 0.38m/s, a flow adjustment of ${\pm}$20% should be considered into the push and +20% into the pull flow system Although there are many studies about the efficiency evaluation of push pull hood system based on CFDs(Computational Fluid Dynamics) and experiments, there have been no reports regarding the influence of velocities and direction of cross-draft on push-pull hood efficiency. This study was conducted to investigate the influence of cross draft direction and velocities on the capture efficiency of the push-pull ventilation system. Smoke visualization method was used along with mock-up of push-pull hood systems to verify the ventilation efficiency by experiments. When the cross-draft blew from the same origins of the push flows, the efficiency of the system was in it's high value, but it was decreased significantly when the cross-draft came from the opposite side of push flows Moreover, the efficiency of the system dramatically decreased when the cross-draft of open surface tank was faster than 0.4m/s.

수도권 지역의 대기환경관리 시행계획 추진결과 평가를 위한 대기질 모델링 적용 방법 (Methodology of Application to Air Quality Model to Evaluate the Results of the Enforcement Plan in Seoul Metropolitan Area)

  • 유철;이대균;이용미;이미향;홍지형;이석조
    • 한국환경과학회지
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    • 제20권12호
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    • pp.1647-1661
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    • 2011
  • The Government had devised legislation of Special Act and drew up guidelines for improving air quality in Seoul Metropolitan area. In 2007 local government of Seoul, Incheon and Gyeonggi conducted the results of application policy by reduced air pollutants emission for the first time. Although there was reduction of air pollutant emission in each local government, it was ineffective as expected using air pollution monitoring database. Therefore we worked out a way to prepare modeling input data using the results of enforcement plan. And we simulated surface $NO_2$ and PM10 before and after decrease in air pollutants emission and examine reduction effects of air pollution according to enforcement regulation except other influence, by using MM5-SMOKE-CMAQ system. Each local government calculated the amount of emission reduction under application policy, and we developed to prepare input data so as to apply to SMOKE system using emission reduction of enforcement plan. Distribution factor of emission reduction were classified into detailed source and fuel codes using code mapping method in order to allocate the decreased emission. The code mapping method also included a way to allocate spatial distribution by CAPSS distribution. According to predicted result using the reduction of NOx emission, $NO_2$ concentration was decreased from 19.1 ppb to 18.0 ppb in Seoul. In Gyeonggi and Incheon $NO^2$ concentrations were down to 0.65 ppb and 0.68 ppb after application of enforcement plan. PM10 concentration was reduced from 18.2 ${\mu}g/m^3$ to 17.5 ${\mu}g/m^3$ in Seoul. In Gyeonggi PM10 concentration was down to 0.51 ${\mu}g/m^3$ and in Incheon PM10 concentration was decreased about 0.47 ${\mu}g/m^3$ which was the lower concentration than any other cities.

HSDI 디젤 엔진 연비 저감 개발에 대한 연구 (Study of HSDI Diesel Engine Development for Low Fuel Consumption)

  • 전제록;유준;윤금중
    • 한국자동차공학회논문집
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    • 제14권1호
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    • pp.138-143
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    • 2006
  • Modification of injector, oil ring tension reduction and oil pump rotor re-matching with optimization of relevant engine control parameters could drive fuel consumption reduction of HSDI diesel engine. A 5 holes injector was replaced with a 6 holes with smaller nozzle hole diameter and 1.5 k factor, and evaluated in a view of fuel economy and emission trade-offs. With introducing smaller nozzle hole diameter injector, PM(Particulate Matter) was drastically decreased for low engine load and low engine rpm. Modification of oil pump and oil ring was to reduce mechanical friction and be proved to better fuel economy. Optimization of engine operating conditions was a great help for the low fuel consumption. Influence of the engine operating parameters· including pilot quantity, pilot interval, air mass and main injection timing on fuel economy, smoke and NOx has been evaluated with 14 points extracted from NEDC(New European Driving Cycle) cycle. The fuel consumption was proved to $7\%$ improvement on an engine bench and $3.7\%$ with a vehicle.

글루타티온 S-전환효소 다형성과 뇌혈관질환(腦血管疾患) 및 사상체질 사이의 연관성(聯關性)에 관한 연구 (Interrelationships among Glutathione S-Transferase Polymorphisms, Cerebrovascular Disease and Sasang Constitution)

  • 김종관;한병삼;김경요;고기덕;옥윤영
    • 사상체질의학회지
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    • 제14권1호
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    • pp.123-131
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    • 2002
  • Glutathione S-transferase polymorphisms (GST) were examined in 98 cases with cerebrovascular disease (CVD) to test the hypothesis that GST polymorphisms confer a risk to an individual to develop CVD. Tobacco smoke is a major cause of both cancer and vascular disease. We therefore were stratified the subjects with CVD for smoking status, and then examined whether polymorphisms in this detoxification enzyme gene, GST, influence risk of CVD. Neither GSTM1 nor GSTT1 genotypes in the CVD group was significantly different from the control group (n=230), even in smokers. We attempted the combined analyses for GSTM1 and GSTT1 genotypes in CVD for smoking status. No significant association observed between the combined genotypes and CVD. We also classified the subjects and control group into four types according to Sasang Constitutional Medicine, Korean Traditional Oriental Medicine, and investigated the association among GST genotypes, CVD, and Sasang constitutional classification. Our observations do not confirm the effect of the GSTM1 and GSTT1 genotypes as a risk factor for CVD, even in smokers. Furthermore, we first attempted to evaluate the efficacy of Sasang Constitutional Medicine, and to find an association with CVD.

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Glutathione S-transferase polymorphisms and traditional classification in Korean population with cerebrovascular disease

  • Um, Jae-Young;Ok, Yoon-Young;Joo, Jong-Cheon;Kim, Kyung-Yo;Kim, Na-Hyung;Hong, Seung-Heon;Kim, Hyung-Min
    • Advances in Traditional Medicine
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    • 제4권2호
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    • pp.112-119
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    • 2004
  • Glutathione S-transferase polymorphisms (GST) were examined in 98 cases with cerebrovascular disease (CVD) to test the hypothesis that GST polymorphisms confer a risk to an individual to develop CVD. Tobacco smoke is a major cause of both cancer and vascular disease. We therefore were stratified the subjects with CVD for smoking status, and then examined whether polymorphisms in this detoxification enzyme gene, GST, influence risk of CVD. Neither GSTM1 nor GSTT1 genotypes in the CVD group was significantly different from the control group (n=230), even in smokers. We attempted the combined analyses for GSTM1 and GSTT1 genotypes in CVD for smoking status. No significant association observed between the combined genotypes and CVD. We also classified the subjects and control group into four types according to Sasang Constitutional Medicine, Korean Traditional Oriental Medicine, and investigated the association among GST genotypes, CVD, and Sasang constitutional classification. Our observations do not confirm the effect of the GSTM1 and GSTT1 genotypes as a risk factor for CVD, even in smokers. Furthermore, we first attempted to evaluate the efficacy of Sasang Constitutional Medicine, and to find an association with CVD.

서울 남자 직장인의 건강행위실천별 건강식품 섭취 행동 의도 및 영향 요인 (Health Food Intake and Behavioral Intentions to Take Health Food on Male Workers by Practiced Health Behavior in Seoul)

  • 이승교
    • 한국지역사회생활과학회지
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    • 제21권2호
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    • pp.243-257
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    • 2010
  • This study was conducted to search the health food intake behavioral intentions of male workers. The health-related behavior of 150 subjects were compared(smoke, alcohol drink, breakfast, BMI, sleep, exercise and health check). On the basis of the Theory of Planned Behavior, the factors health-food intake behavior were evaluated; there were normative beliefs, motivation for compliance, subjective norms, social influence factors, and barriers as perceived behavior control. The results were showed with five points by the Likert scale and Significance by t-test. The most frequently consumed health food was tea(3.40/4points) followed by healthy drinks(2.49/4). As behavioral beliefs, if consumption of 'nutritional supplements'(3.61/5) and 'fatigue recovery'(3.62/5) received the highest scores. As a result, the idea of 'nutritional supplements'(3.94/5) and 'fatigue recovery'(4.06/5) were the important aspects, but others were also positively evaluated. As a sub-factor of subjective norms on normative beliefs, The highest social groups to encourage consumption of health food were parents (3.93/5), and the lowest were doctors (3.02/5). The most influential people were doctors (3.67/5) and spouses (3.65/5). Barriers to consumption health food were side effects (1.09/5) and price (2.08/5). Taking Ginseng products and other processed foods (juice, honey, bamboo, etc.) were correlated with health concern (p<0.05). Taking traditional stamina foods was correlated with dietary habit recognition (p<0.05). Mineral intake was positively correlated with age. Healthy drinks was negative (p<0.05). Minerals and supplement consumption were correlated with the practice of healthy behavior (p<0.01).

식이 요거트의 효과: 흡연남성에게서 요거트에 의한 혈액성분의 변화 (Effects of Dietary Yogurt: Changes in Blood Components on Healthy Men Smokers)

  • 김현경;권창오;김병원;김수환;류재기
    • 대한임상검사과학회지
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    • 제52권2호
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    • pp.105-111
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    • 2020
  • 흡연은 염증 증가와 관련이 있으며 다양한 질환의 위험 인자이다. 요거트는 건강에 이로운 영향을 미치는 것으로 알려져 있다. 이 연구에서는 요거트 섭취가 흡연자들의 혈액학적 변수와 섬유소원 수치에 미치는 영향을 조사하였다. 연구대상자들은 네 개의 군으로 나누었는데 비흡연자는 대조군과 요거트군으로, 흡연자는 흡연군과 복합군(흡연하면서 요거트 섭취)으로 분류하였다. 연구대상자들은 3주 동안 요거트 섭취와/또는 담배를 피웠으며 3주 후에 혈액학적 변수와 섬유소원의 수치 변화를 조사하였다. 연구 결과, 복합군에서 호중구와 섬유소원의 수치가 의미 있게 증가한 반면 림프구 수치는 감소했다. 호산구 수치는 흡연군에서 의미 있게 증가했지만 복합군에서는 변화가 없었다. 또한 흡연군과 복합군에서 평균혈색소농도가 증가하여 흡연이 적혈구 수명에 영향을 미칠 수 있음을 나타냈다. 결론적으로, 이 연구는 요거트 섭취가 흡연자들의 호중구, 림프구, 섬유소원의 수치를 조절함으로써 면역 기능에 영향을 미칠 수 있다는 것을 보여주었고 흡연군과 달리 복합군에서는 호산구 수치가 증가하지 않음으로써 요거트 섭취가 알레르기 반응에 억제 효과를 가지게 할 수 있다는 것을 나타냈다.