백우현 교수 정년퇴임 기념호

학회자료 한국환경과학회 2006 한국환경과학회지 Vol.15 No.3

산림과 도심에서의 조망 및 보행활동이 인체의 생리,심리에 미치는 효과

지경배 ( Gyeong Bae Ji ),김경남 ( Kyeong Nam Kim ),한갑수 ( Gab Soo Han ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.5

The purpose of this study is to analyze psychological and physiological effects accordance with viewing and walking in the forest and urban area. In the result of measurement of physiological reactions in nervous system, viewing of the forest had a calming effect on the nervous system by reducing blood pressure and heart rate. The other hand, viewing and walking in the urban area compared to the forest area raised stress by increasing blood pressure and heart rate. In addition, viewing in forest area was effective in stress relief by noticeable reduction of the amylase concentration. In contrast, walking in the urban area was also confirmed an increase of stress by increasing the concentration of the amylase. A viewing and walking in forest area was effective in alleviating depressed on anxiety, anger, fatigue and confusion.

경험모델을 이용한 충격기류식 여과집진기의 적정 탈진압력 예측

서정민 ( Jeong Min Suh ),박정호 ( Jeong Ho Park ),임우택 ( Woo Taik Lim ),강점순 ( Jum Soon Kang ),조재환 ( Jae Hwan Cho ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.5

A pilot-scale pulse-jet bagfilter was designed, built and tested for the effects of four operating conditions (filtration velocity, inlet dust concentration, pulse pressure, and pulse interval time) on the total system pressure drop, using coke dust from a steel mill factory. Two models were used to predict the total pressure drop according to the operating conditions. These model parameters were estimated from the 180 experimental data points. The empirical model (EM) with filtration velocity, areal density, inlet dust concentration, pulse interval time and pulse pressure shows the best correlation coefficient (R=0.971) between experimental data and model predictions. The empirical model was used as it showed higher correlation coefficient (R=0.971) compared to that of the Multivariate linear regression(MLR) (R=0.961). The minimum pulse pressure predicted by empirical model (EM) was 5kg/㎠.

활성탄에 의한 난분해성 염료인 Eosin Y의 흡착

이민규 ( Min Gyu Lee ),감상규 ( Sang Kyu Kam ),서근학 ( Keun Hak Suh ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.5

The adsorption behavior of Eosin Y on activated carbon (AC) in batch system was investigated. The adsorption isotherm could be well fitted by the Langmuir adsorption equation. The kinetics of adsorption followed the pseudo-second-order model. The temperature variation was used to evaluate the values of free energy (ΔGo), enthalpy (ΔHo) and entropy (ΔSo). The positive value of enthalpy change ΔH° for the process confirms the endothermic nature of the process and more favourable at higher temperature, the positive entropy of adsorption ΔS° reflects the affinity of the AC material toward Eosin Y and the negative free energy values ΔG° indicate that the adsorption process is spontaneous. With the increase of the amount of AC, removal efficiency of Eosin Y was increased, but adsorption capacity was decreased. And adsorption capacity was increased with the decrease of particle size. With the increase of the amount of AC, removal efficiency of Eosin Y was increased, but adsorption capacity was decreased. And adsorption capacity was increased with the decrease of particle size.

LED 광질이 관엽식물의 기능성 최적화에 미치는 영향

김명선 ( Myung Seon Kim ),채수천 ( Soo Cheon Chae ),안승원 ( Seoung Won Ann ),최원춘 ( Won Chun Choi ),이명원 ( Myung Won Lee ),이국한 ( Kook Han Lee ),류효명 ( Xiao Ming Liu ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.5

White light and compound light were found to be the ideal light sources for improving the functionality and ornamental value of indoor plants and reducing the cost of maintenance, but because compound light hinders people from recognizing the original color of plants and makes their eyes easily tired, white light was considered the optimal light satisfying all of the ornamental value, economic efficiency and functionality resulting from plant growth. On the other hand, in the results of examining physiological changes before and after treatment on fine dust PM10 and carbon dioxide removal capacity in a closed chamber under an artificial light source, the patterns of carbon dioxide and fine dust removal were similar among the treatment groups according to light condition, but according to plant type, the removal rate per unit leaf area was highest in Spathiphyllum and lowest in Dieffenbachia. In the experiment on dust and carbon dioxide removal, the photosynthetic rate was over 2 times higher after the treatment, and the rate increased particularly markedly under compound light and white light, suggesting that the photosynthetic rate of plants increases differently according to light quality. These results show that light quality has a significant effect on the photosynthetic rate of plants, and suggests that plants with a high photosynthetic rate also have a high carbon dioxide and dust removal capacity. In conclusion, the photosynthetic rate of foliage plants increased under white and blue light that affect photosynthesis and the increased photosynthetic rate reduced carbon dioxide and fine dust, and therefore white and compound light were found to be the optimal light sources most functional and economically efficient in improving ornamental value and indoor air quality.

작물재배 환경이 Arbuscular 내생균근 균의 상대밀도와 작물체의 인(P) 함량에 미치는 영향

이국한 ( Kook Han Lee ),안승원 ( Seoung Won Ann ),이창홍 ( Chang Hong Lee ),이인봉 ( In Bong Lee ),채수천 ( Soo Cheon Chae ),김혜영 ( Hye Young Kim ),김영칠 ( Young Chil Kim ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.5

Available phosphorus(P2O5) in conventionally cultivated soil was more abundant in two fold than that of organically cultivated soil. Relative density of Arbuscular Mycorrhizal Fungi (AMF) was higher in organically cultivated soil, That of welsh onion cultivated soil was the highest, that of strawberry was followed and then that of pepper, respectively. Relative density of AMF was inversely proportioned to available soil phosphorus. Phosphorus content of crop and relative density of AMF were more abundant in organically cultivated crop or soil. However available soil phosphorus content was much in conventionally cultivated soil. The phosphorus contents between soil and crop were negatively correlated. The phosphorus content of crop was increased as the relative density of AMF increased. Relative density of AMF in the organically cultivated soil and phosphorus content of the crop with organic cultivation were higher than those of conventionally cultivated.

수처리용 유전체 장벽 방전 플라즈마 반응기 개발

김동석 ( Dong Seog Kim ),박영식 ( Young Seek Park ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.5

Non-thermal plasma processing using a dielectric barrier discharge (DBD) has been investigated as an alternative method for the degradation of non-biodegradable organic compounds in wastewater. The active species such as OH radical, produced by the electrical discharge may play an important role in degrading organic compound in water. The degradation of N, N-Dimethyl-4-nitrosoaniline (RNO) was investigated as an indicator of the generation of OH radical. The DBD plasma reactor of this study consisted of a plasma reactor, recycling pump, power supply and reservoir. The effect of diameter of external reactor (15 ∼ 40 mm), width of ground electrode (2.5 ∼ 30 cm), shape (pipe, spring) and material (copper, stainless steel and titanium) of ground electrode, water circulation rate (3.1 ∼ 54.8 cm/s), air flow rate (0.5 ∼ 3.0 L/min) and ratio of packing material (0 ∼ 100 %) were evaluated. The experimental results showed that shape and materials of ground were not influenced the RNO degradation. Optimum diameter of external reactor, water circulation rate and air flow rate for RNO degradation were 30 mm, 25.4 cm/s and 4 L/min, respectively. Ground electrode length to get the maximum RNO degradation was 30 cm, which was same as reactor length. Filling up of glass beads decreased the RNO degradation. Among the experimented parameters, air flow rate was most important parameters which are influenced the decomposition of RNO.

활성탄과 합성 제올라이트를 이용한 폐절연유 내 PCBs 흡착

추헌직 ( Heon Jik Chu ),최성우 ( Sung Woo Choi ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.5

In this study, adsorption of polychlorinated biphenyls(PCBs) in transformer oil on powder activated carbon (PAC) and synthetic zeolite was evaluated. Adsorption characteristics of PCBs on the PAC and zeolite has been investigated in a batch system with respect to adsorbents amount and contact time. BET results showed 908 m2/g for PAC and 483 m2/g for zeolite. The adsorption capacity of PCBs increased with an increasing input amount of absorbent. The adsorption experimental results showed that PAC removed 90% of input PCBs in transformer oil while zeolite removed only 64%. Adsorption of PCBs to PAC and zeolite fit the Freundlich model well. The Freundlich parameter, Kf, for PAC and zeolite was 193.1 and 43.0 respectively, indicating that PAC is effect adsorbent for PCBs adsorption in transformer oil.

CTABr 미셀 용액속에서 2-Alkylbenzimidazole 음이온에 의해 추진되는 Isopropyl phenyl-4-nitrophenyl phosphinate(IPNPIN)의 탈인산화반응

김정배 ( Jeung Bea Kim ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.5

This study is mainly focused on micellar effect of cetyltrimethyl ammonium bromide(CTABr) solution including alkylbenzimidazole(R-BI) on dephosphorylation of isopropyl-4-nitrophenylphosphinate(IPNPIN) in carbonate buffer(pH 10.7). The reactions of IPNPIN with R-BIe are strongly catalyzed by the micelles of CTABr. Dephosphorylation of IPNPIN is accelerated by BIe ion in 10-2 M carbonate buffer(pH 10.7) of 4×10-3 M CTABr solution up to 89 times as compared with the reaction in carbonate buffer by no benzimidazole(BI) solution of 4×10-3 M CTABr. The value of pseudo first order rate constant(kψ) of the reaction in CTABr solution reached a maximum rate constant increasing micelle concentration. Such rate maxima are typical of micellar catalyzed bimolecular reactions. The reaction mediated by R-BIe in micellar solutions are obviously slower than those by BIe, and the reaction rate were decreased with increase of lengths of alkyl groups. It seems due to steric effect of alkyl groups of R-BIe in Stern layer of micellar solution. The surfactant reagent, CTABr, strongly catalyzes the reaction of IPNPIN with R-BI and its anion(R-BIe) in carbonate buffer(pH 10.7). For example, 4×10-3 M CTABr in 1×10-4 M BI solution increase the rate constant(kψ=98.5×10-3 sec-1) of the dephosphorylation by a factor ca.25, when compared with reaction(kψ=3.9×10-4 sec-1) in 1×10-4 M BI solution(without CTABr). And no CTABr solution, in 1×10-4 M BI solution increase the rate constant(kψ=3.9×10-4 sec-1) of the dephosphorylation by a factor ca.39, when compared with reaction (kψ=1.0×10-5 sec-1) in water solution(without BI). This predicts that the reactivities of R-BIe in the micellar pseudophase are much smaller than that of BIe. Due to the hydrophobicity and steric effect of alkyl group substituents, these groups would penetrate into the core of the micelle for stabilization by van der Waals interaction with long alkyl groups of CTABr.

농산물 생산량과 기상요소의 상관관계 분석

이기광 ( Ki Kwang Lee ),고광근 ( Kwang Kun Ko ),이중우 ( Joong Woo Lee ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.4

Agriculture is more influenced by environmental factors rather than other industries. Among the environmental factors, the meteorological conditions mainly impact the output of agricultural products. Hence, the purpose of this study is to analyze the impact of meteorological factors on the output of elemental agricultural products. As a first step, we obtained the data of the meteorological factors (i.e., precipitation, humidity, temperature, insolation, snowdrifts, wind velocity) and the output of the various agricultural products (i.e., grain, fruits and vegetables, root crops, green vegetables, seasoned vegetables, fruits, special crops) from the year 1990 to 2009 (20 years) of Seoul and the six metropolitan cities in Korea. Then, the analysis of the correlation between the agricultural product with the largest output and the meteorological factors of the place where the corresponding agricultural product is most produced, was carried out in order to determine the core meteorological factor that most impacts the output of agricultural product. The correlation analysis revealed that humidity, insolation and wind velocity have been the crucial meteorological factors to influence the output of the agricultural products. From the result, we can induce that the meteorological forecast information about the vital meteorological factors, i.e., humidity, insolation and wind velocity, facilitates the optimized cultivation plan to maximize the output of agricultural products.