This study aimed to investigate the effects of amino acid complex additives, such as protected vitamin C (VC) or detoxified sulfur (DS), on the growth and metabolism of Hanwoo cattle under high-temperature conditions. Accordingly, farms in Temperature-Humidity Index (THI) regions ranging from 78 to 89 for over 100 days were selected. The experimental groups were control, T1 (lysine + methionine + VC, 50 g/head/day), and T2 (lysine + methionine + DS, 50 g/head/day) with 70, 77, and 71 animals each. The range of the THI for 115 days was 78-89, and this occurred in most of the experiment days. The results showed that there was no significant difference in rectal temperature among the groups. The body weight increased to 786.4 and 809.0kg in the T1 and T2 groups, respectively, compared to the control group (p<0.05). Linoleic acid showed a high result of 2.01% in the T1 group compared to the control group (p<0.05). Unsaturated fatty acids were higher at 55.70 and 56.54% in the T1 and T2 groups, respectively, compared to the control group (p<0.05), and the omega 6/3 ratio was reduced to 20.10% (p<0.05). These findings indicate that T1 has a positive impact on growth, meat quality, and fatty acid composition compared to the control group. In conclusion, amino acid complex with VC improved the body weight of Hanwoo steers and the unsaturated fatty acids and essential amino acids of their meat; however, further research is needed to clarify this impact on carcass performance.

Environmental fundamental facilities have different odor emission characteristics depending on the type of treatment facilities. To overcome the limitations of the olfactometry method, research needs to be conducted on how to calculate the dilution factor from the individual odor concentrations. The aim of this study was to determine the air dilution factor estimated from manually measured concentration data of individual odor substances (22 specified odor species) in three environmental treatment facilities. In order to calculate the optimum algorism for each environmental fundamental facility, three types of facilities were selected, the concentration of odor substances in the exhaust gas was measured, and the contribution of the overall dilution factor was evaluated. To estimate the dilution factor, four to six algorism were induced and evaluated by correlation analysis between substance concentration and complex odor data. Dilution factors from O municipal water treatment (MWT) and Y livestock wastewater treatment (LWT) facilities showed high level of dilution factors, because concentration levels of hydrogen sulfide and methylmercaptan, which had low odor threshold concentrations, were high. In S food waste treatment (FWT) facility, the aldehyde group strongly influenced dilution the factor (dominant substance: acetaldehyde, i-valeraldhyde and methylmercaptan). In the evaluation of four to six algorism to estimate the dilution factor, the vector algorism (described in the text) was optimum for O MWT and Y LWT, while the algorism using the sum of the top-three dominant substances showed the best outcome for S FWT. In further studies, estimation of the dilution factor from simultaneously monitored data by odor sensors will be developed and integrated with the results in this study.

The effect of the change in air inflow velocity has been investigated at the opening of the malodor emission source to determine its influence on the Complex odor concentration. Both the Complex odor collection efficiency and concentrations were measured according to the change in airflow velocity. When the air inflow velocity was 0.1 m/s, it was observed that some of the generated gas streams were diffused to the outside due to low collection efficiency. In contrast, only the increased gas collection volume up to 0.5 m/s showed no substantial reduction of the Complex odor concentration, which indicates an increase in the size of the local exhaust system as well as the operation cost for the Complex odor control device. When the air inflow velocity reached 0.3 m/s, the Complex odor concentrations not only were the lowest, but the odorous gas could also be collected efficiently. The air inflow velocity at the opening of the malodor emission source was considered the key factor in determining the gas collection volume. Therefore, based on the results of this study, an optimal air inflow velocity might be suggestive to be 0.3 m/s.

국토의 환경생태적 평가 등급과 환경부에서 제공하는 도시대기 측정망의 대기오염물질들 농도와의 상관관계를 분석하여 환경생태적으로 우수한 지역이 대기오염물질의 농도 저감에 영향을 미치는지를 살펴보고자 했다. 이를 위해 본 연구에서는 우리나 라 전체 260개 시군구를 대상으로 2013년부터 2018년까지 측정된 환경부 도시대기 측정망 자료와 보간법 중 하나인 IDW를 적용하여 2013년부터 2018년까지의 각 시군구별 대기오염물질 평균 농도와 환경생태적 평가 등급의 면적 비율과의 피어슨 상관분석을 수행했다. SO2, CO, NO2, PM10, PM2.5의 농도 값은 환경생태적으로 우수한 지역인 1등급의 비율이 높은 지역일수록 상대적으로 음의 상관성이 뚜렷하게 나타났다. 반대로, 환경생태적 평가등급이 낮은 5등급의 비율이 증가할수록 오히려 대기오염물질과 높은 양의 상관성을 보였다. 즉, 환경생태적으로 우수한 지역의 비율이 높을수록 대기오염물질의 농도가 낮으며, 그 반대의 경우에는 대기오염물질의 농도가 높았다. 이는 녹지 중에서도 환경생태적으로 우수한 녹지의 면적이 차지하는 비율이 높을수록 대기오염물질 의 농도 감소에 긍정적 영향을 미칠 수 있음을 보여준다. 따라서 국민의 건강에 직접적 영향을 미치는 대기오염물질의 농도를 감소시키기 위해서는 환경생태적 우수지역의 면적을 충분히 확보할 필요가 있을 것이라 판단되며, 향후 도시계획 단계에서 환경생 태 우수지역과 연계된 계획의 수립이 필요하다고 판단된다. 후속 연구에서는 이러한 오염물질들의 특성 및 환경생태적 우수지역의 패치 면적, 패치 분포 등 다양한 사항들을 고려하여 추가적인 상관분석을 수행하고, 분석 결과를 국가 정책에 반영해야 할 것으로 생각된다.

Most of the odorous substances generated in public environment facilities are treated using a local exhaust ventilation system. This study assessed the leakage of odorous substances by measuring design criteria, collected air volume, and complex odor in the unit process of sewage treatment facilities. The closer the guideline/design operation airflow ratio of each odor source is to 1.0, the more identical the guideline:design:operation airflow. The average air volume ratio of the facilities under the study was 0.95~0.99 for the MBR process and 0.29~0.68 for the BNR process. As a result of comparing the types of wastewater treatment processes, the leakage of odorous substances was about 9.7 times higher in the BNR process (192,732 m3/min) than in the MBR process (19,838 m3/ min). In this study, it was found that the following two means are important for the proper collection and prevention of odorous substances. The first is the estimation of collection air volume with consideration to the characteristics of the odor source (temperature, odor generation condition, etc.). The second is the design and operation of the local exhaust ventilation system.

Sorghum is a rich source of various phytochemicals including phenolic compounds that have potential to significantly benefit human health. Phytochemical production may be induced not only by genotype but also by a number of environmental factors including temperature and an amount of sunshine. The objective of this study was to determine the effect of planting dates and harvesting stages on the quality traits of ‘Donganme,’ a grain sorghum variety developed to produce high antioxidants. ‘Donganme’ was planted in three locations on four dates from early May to early July. Each planted fraction was harvested 35, 40, 45, 50, and 55 days after the head shooting date, respectively. The results showed that significant differences existed between the growth period and content of polyphenol and flavonoid. The sorghum harvested at 35 days after head shooting had the higher polyphenol and flavonoid content in all planting times and the tannin content was increased as the planting date was delayed. So the sorghum grown in late planting dates (July 5) had highest polyphenol content (2.07 gGAE/100g) at early harvesting (35 days) while late planting gave the low grain yield (1.3 ton/ha). Polyphenol index to average temperature during 35 and 45 days after heading of ‘Donganme’ showed that total polyphenol contents were decreased by 5.2% and 4.4%, respectively, with increasing average temperature of 1oC. And high correlation (R=0.85) was observed between accumulated temperature and the amount of polyphenol of ‘Donganme’, confirming the major contribution of the quality traits is temperature. To produce high quality grain from sorghum the relation between the yield and nutrition components must be considered simultaneously (i.e., Sorghum produced the highest polyphenol and flavonoid when planted in June 15 and harvested at 40 to 45 days after head shooting .

유류와 위험 유해물질(Hazardous and Noxious Substances, 이하 HNS)을 포함하는 위험물질의 해상운송 중에 발생하는 사고가 증가하고 있어, 이러한 위험물질 해양사고를 방지할 수 있는 예방대책을 마련해야 할 것이다. 이를 위해 국내에서 발생하는 위험물질 해양사고 자료(2002~2014)를 수집하여 인명 및 환경 위험도를 분석하였으며, 사고원인 규명 및 적절한 예방대책이 필요한 우선 안전관 리분야를 파악하고자 하였다. 인명위험도는 선박 수리 및 탱커세정(tank cleaning) 작업과정에서 발생하는 폭발 및 인명사고 중 질식 등 이 높은 것으로 분석되었다. 환경위험도는 충돌, 좌초 등에 의한 유출사고로 인해 발생하였다. 또한 비포장 상태의 위험화물을 선박에 적재 중 취급부주의로 인하여 유출사고가 일어났다. 다수의 사고는 적합한 안전장비 미착용, 취급 부주의 등 인적오류로 인한 사고로 서 관리·감독을 강화하고, 주기적인 교육·훈련을 통하여 사고 저감이 가능하다. 위험물질 해양사고를 예방하기 위해서는 물질 자체 고 유의 특성상 유해성과 위험성을 지닌 위험물질(유류와 HNS)에 대한 안전관리를 더욱 강화해야 한다.

Exposure to the indoor air pollutants could be associated with the risk of developing atopic dermatitis, including allergic symptoms and exacerbations. A total of Fifty homes who had a past or current symptoms of atopic dermatitis were enrolled in the study. To rate the levels of environmental factor, we measured concentrations of PM2.5, PM10, Heavy metals XRF (X-Ray Fluorescene), Bacteria (CFU/m3), mold (CFU/m3) in dust of the children’s houses. The prevalence of atopic dermatitis in children is increasing especially in Urban areas. Exposure to levels of indoor environmental factor and air pollutants has been related to atopic dermatitis development. The house dust were higher for the results of atopy, asthma patients analyzed fungi and bacteria, resulting XRF measurements Cr (chromium), As (arsenic), Br (bromine), Cd (cadmium), Hg (mercury), Pb (lead) etc. this has a significant relationship. Recent studies have shown that indoor air pollutants control is beneficial in reducing atopic dermatitis prevalence and development. Urban areas children are exposed to kinds of indoor environmental factor and air pollutants that may lead to atopic dermatitis development.

In this study, we analyzed the concentration of cadmium and mercury in urine and lead in blood from 668 residents in the exposed and compared areas in Gwangyang-si and Yeosu-si, from July 2013 to December 2015. According to the lifestyle (past smoking, current smoking, passive smoking, drinking and exercise), the concentration of cadmium in urine was higher in the compared areas than in the exposed areas in Gwangyang. However, the concentration of cadmium in urine according to the lifestyle except drinking was higher in the exposed areas than in the compared areas in Yeosu. According to the past smoking and current smoking, the concentration of mercury in urine was higher in the compared areas than in the exposed areas in Gwangyang, but the passive smoking, drinking and exercise showed similar concentration levels both in the exposed and compared areas in Gwangyang. The concentration of mercury in urine according to the past smoking and current smoking was higher in the exposed areas than in the compared areas in Yeosu, but the concentration of mercury in urine according to the drinking and exercise was lower in the exposed areas than in the compared areas in Yeosu. According to the past smoking, the concentration of lead in blood showed similar concentration levels in the exposed and compared areas in Gwangyang, but regarding current and passive smoking, it was higher in the compared areas than in the exposed areas in Gwangyang. Especially, the concentration of lead in blood according to the drinking in Gwangyang showed statistically significant difference (p<0.05). The concentration of lead in blood according to the lifestyle was higher in the compared areas than in the exposed areas in Yeosu.

Bloom of small centric diatom Stephanodiscus is quite occasional in winter season in temperate freshwater ecosystems. It often leads to degradation of water quality and affects the quality of supplied drinking water. In a previous study, we have found that naphthoquinone (NQ) 4-6 derivate is an effective tool for efficient mitigation of natural S. hantzschii blooms. In the present research, polylactide (PLA) and agar foam were used as immobilized agent for NQ 4-6 to improve the efficiency of NQ 4-6 compound releasing process for its application under various field conditions. Mesocosm experiments at 10 ton scale suggested that the abundance of S. hantzschii was continuously increased in the control and upon treatment of the mesocosm with immobilized NQ 4-6 from PLA and agar foam. Their algicidal activities were 78.8% and 77.1%, respectively, on S. hantzschii after 10 days. In the mesocosm experiments, the dynamics of biotic (bacteria, HNFs, ciliates, zooplankton) and abiotic (water temperature, dissolved oxygen, pH, conductivity, nutrients) factors remained unaffected. They exhibited similar trends in the control and treatment groups. Therefore, the immobilized NQ 4-6 from PLA and agar foam has potential to be used as an alternative algicidal substance to effectively mitigate natural S. hantzschii blooms under various field conditions. In addition, it not only can be used to control S. hantzschii, but also is an effective technique. The immobilized NQ 4-6 showed stable controlled release in desired system.

The indoor air quality of residences has been regulated by designating recommended standard levels of pollutants for newly built apartments. But as of yet, no related guideline has been established for dwellings that are already occupied. From a sociological viewpoint, the gap between the rich and poor has been gradually increasing with economic development, and this has extended to the diversification of house types and living environments. Specifically, people who have the lowest income levels may live in temporary houses such as vinyl greenhouses and shanty houses, and their living environment is mostly inadequate as a result. In this study, we surveyed the indoor air quality in normal and socially vulnerable houses after the occupation stage and tried to figure out the main factors influencing indoor air quality. Airborne fungi are detected more frequently in lower living standard houses. Put another way, the concentration of airborne bacteria and the volatile organic compound levels are much higher than in normal dwellings.

Hazardous air pollutants such as NO2, VOCs and PM10 were measured Daegu, Korea in major micro-environments,where housewives spend the most of their time, and personal exposure times were estimated by using time activitypatterns and exposure scenarios. The major microenvironments of housewives were selected using the ‘Time-UseSurvey’ conducted by the National Statistical Office in Korea in 2009. A total of 4,514 (weekdays) and 3,063(weekends) housewives were recruited for the ‘Time-Use Survey.’ It seems that housewives are spending about80% of their time in the house, and about 5% of their time outdoors during weekdays and weekends. The indoor/outdoor ratio of the average concentration of NO2 was more than 1, which indicated that the source was indoors.Toluene was shown to have higher concentrations indoors than outdoors. Ethylbenzene and xylene displayedsimilar characteristics to toluene, and the concentration ratio for indoor/outdoor was shown to be 1.29 ± 0.76 and1.04 ± 0.45, respectively, higher concentrations indoors. Based on the results of the time activity patterns ofparticipants, 3 kinds of exposure scenarios were formulated. The spent time and air concentration in eachenvironment were assumed as normal and lognormal distribution, respectively. And then the Monte-Carlosimulation was conducted. According to the result of the simulation, the exposures to hazardous air pollutantsrevealed an increasing pattern as housewives visits other indoor environments such as supermarkets.

본 연구는 양돈 슬러리의 악취물질 감소에 효과가 있는 것으로 확인된 물질의 효능을 비교분석하기 위하여 수행되 었다. 페놀류 농도는 고추냉이와 아몬드피 구에서 낮았고, 인돌류 농도는 아몬드피 구에서 가장 낮았다(p<0.05). 따라 서 슬러리에 아몬드피를 첨가하면 VOC 농도가 감소되었 다. SCFA 농도는 팽이버섯폐배지와 아몬드피 구에서 높았 고, BCFA 농도는 대조구에 비해 다른 모든 처리구에서 낮 았다(p<0.05). 또한 슬러리의 pH는 팽이버섯폐배지와 아몬 드피 구에서 낮았다(p<0.05). 따라서 팽이버섯폐배지 또는 아몬드피를 슬러리에 첨가하면 SCFA 농도는 증가되고 BCFA 농도는 감소되는 것으로 나타났다.

환경대기 중의 휘발성유기화합물을 채취할 때 사용하는 샘플링 방법은 백을 이용한 샘 플링 방법과 흡착관을 이용한 샘플링이 대표적이다. 본 연구에서는 실제 대기시료를 이 용하여 두 샘플링 방법을 동시에 진행하여 비교하고자 하였다. 시료의 채취방법에 따른 회수율 정도를 알아보기 위해, 청국장을 조리하면서 발생하는 시료를 채취하는 과정에서 실험을 진행하였다. 그 결과, 유기산의 회수율이 백 샘플링보다 흡착관을 이용한 샘플링 에서 평균적으로 98.6 %의 percent difference (PD)를 나타내는 것을 확인하였다. 카보닐 계열과 방향족은 19.2와 34.3 %로 비교적 적은 차이를 나타냈다. 각 성분 중에서 butyl acetate는 0.50 %로 가장 낮은 수치를 보였고, TMA도 마찬가지로 비교적 낮은 수치를 기록하였다(2.13 %). 이러한 결과는 현장 조건에서 채취방식의 중요성을 확인해 주었다