인공호수의 수질변동 특성에 관한 연구

홍희택,양시영 전북대학교 공업기술연구소 1998 工學硏究 Vol.30 No.-

Artificial lake was constructed to supply an agricultural and industrial water. However the water quality of lake was become worse by circumferential pollutant step by step. This it is necessary the study for characteristics and variation of water quality. This study was performed to analyze the water quality for efficient management of artificial lake. The water quality of Il-san lake was COD 4.8mg/L, T-N 1~3mg/L and T-P was 0.014.8mg/L it means that the water quality standard of the COD is in the degree of Ⅲand the lake can be sue to the service water source.

도시 대기 중 다이옥신 분포 특성에 관한 연구

홍희택 전북대학교 공업기술연구소 2001 工學硏究 Vol.32 No.-

Polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs) are derived from a variety of combustion processes; municipal and industrial waste incinerator, automobiles, and steel mill. PCDD/Fs emitted from these sources contaminated ambient air, and then disappear from the atmosphere by dry/wet deposition and photolysis. This indicates that the concentrations of PCDD/Fs in atmosphere are closely related to artificial factors of some regions such as those of industrialization, population, and also the fate to partition between gaseous and particulate phases. In order to observe the fate of PCDD/Fs in the atmosphere, the concentrations of PCDD/Fs according to scale and usage of regions, gaseous and particulate phases and temperature were investigated. As the result of that, the concentration of PCDD/Fs in atmosphere by cityscale is following. The mean value for the largecity was 0.593 pg-TEQ/N㎥, mediumsizedcity was 0.242pg-TEQ/N㎥, and that of the smallcity was 0.108pg-TEQ/N㎥. The concentration of largecity was higher than that of mediumsizedcity by twice and that of smallcity by five times. In overall, there was a great difference in concentration between regions of mediumsizedcity. The concentration of PCDD/Fs in atmosphere by cityusage is following. The concentration for residential area which was 0.178pg-TEQ/N㎥ was the lowest level of the various areas, commercial area was 0.267pg-TEQ/N㎥, and that of the industrial area was the highest 0.324pg-TEQ/N㎥.

비지정 문화유적의 훼손현황과 식생관리를 통한 저감방안 연구 : 북한산 삼천사지를 사례로

홍희택,김현범,이문행 국립문화재연구원 2013 헤리티지:역사와 과학 Vol.46 No.3

This study aims to identify the natural damage of the Samcheonsaji Temple Site in Bukhansan National Park and to suggest the plans to minimize damage for the remains. The types of natural damage are classified into direct vegetation damage, indirect topographical damage, and artificial damage. The most popular causes of damage to temple sites include the roots of trees as direct vegetation damage and the soil erosion by rain or stream as topographical damage. Direct vegetation damage includes burial remains damaged by the root of trees and vines, but it is often observed that some trees have contributed to protection against collapse. Indirect topographical changes have damaged the ruins by soil erosion caused by floods or typhoons. Vegetation changes due to topographical reasons have also caused damage. Artificial reasons of damage include forestry operations and compaction by hikers. Based on the analysis of the findings, the following could be suggested as plans to resolve these problems:1. Natural damage occurs slowly due to negligence. Therefore, it could be reduced by forestry improvement, including forest density control through thinning, planting to prevent landslides, maintaining grasslands nearby. 2. Deciduous broadleaf trees can be planted to reduce soil erosion by rainfall. It is necessary to maintain the density of forests at around 0.02~0.18 trees/m2. 3. It would be good to grow Quercus spp and Carpinus spp or weaken the community of Robinia pseudoacacia and Pueraria lobata which disturb the ecosystem. Samcheonsaji Temple Site is located in Mt. Bukhan National Park that is a publicly owned property. Therefore, it is constantly maintained for natural preservation and vegetation management could be considered for the preservation of historical remains 본 연구는 비지정 문화유적이 제도권 내에서 보존되기 전까지 자연적인 훼손을 최소화하기 위한 기초연구로서 산림 내에 위치한 사지(寺址)에서 발생하는 자연적인 훼손 양상을 밝히고, 발생 원인에 대해 분석하였으며, 식생관리를 통한 저감방안을 모색하였다. 분석대상지는 다양한 피해 사례가 확인되는 삼천사지로 선정하였다. 사지에서 발생하는 자연적인 훼손은 발생 원인에 따라 크게 식생과 관련된 직접적인 유구 피해(식생), 식생과 간접적으로 관련이 있거나 여타 지형적 요인으로 인한 사지 전반에 대한 피해(지형), 산림작업 및 등산객 이용과 같이 식생과 간접적으로 관련이 있거나 식생환경 개선을 통해 저감할 수 있는 인위적 피해(인위)의 세 가지 유형으로 분류하였다. 식생에 의한 직접적인 피해는 입목의 뿌리에 의한 매장 유구 훼손, 수목 생장에 따른 석축 교란, 입목 전도에 의한 유구 파괴 및 사지 훼손, 기타 덩굴성 식물에 의한 훼손 등이 있으나, 일부는 버팀목이 되어 석축 붕괴를 막아주는 역할도 하였다. 환경변화에 의한 피해는 집중호우(홍수), 태풍으로 인해 토사유출 등이 발생하여 유구에 직접적인 피해를 주거나, 식생환경에 변화를 주어 사지에 2차 피해가 발생한 것으로, 이로 인해 지형 변화, 석축 유실 등이 주로 확인되었다. 인위적 피해는 산림작업에 의한 피해와 등산객 이용에 따른 답압 등이 있다. 이상과 같이 사지에서 발생하는 자연적 훼손에 대한 저감방안은 다음과 같이 고찰하였다. 1. 자연적 훼손의 대부분은 방치에 의한 지속적(遲速的)인 훼손으로 간벌을 통한 산림 밀도 조절, 유적 배면의 사방식재를 통한 토사유출 억제, 유구가 인접한 지역의 대교목 발생 억제를 위해 울폐도 조절을 통한 초본류 육성 등 산림관리를 통해 저감할 수 있다. 2. 강우에 의한 토양침식을 저감하기 위해서는 낙엽활엽수가 유리할 것으로 판단된다. 또한 상층 교목림의 적절한 수관 밀도를 유지할 필요가 있는데, 2~18본/100m2 정도가 적절할 것으로 사료된다. 3. 사지의 보존을 위해서는 참나무류나 서어나무류의 육성이 좋을 것으로 판단되며, 타감작용이 강해 생태계를 교란하는 아까시나무, 칡 등은 점차적으로 세력을 약화시킬 필요가 있다. 삼천사지는 북한산 국립공원 내에 위치하고 국·공유림에 속한다. 따라서 자연환경의 보전을 위해 현재도 꾸준한 산림작업이 실시되고 있으므로, 이러한 과정에서 유적의 보존을 위한 식생관리 방안이 고려될 수 있는 여지가 있다고 판단된다

도로터널 환기시스템에 대한 연구

임익현,홍희택,정태섭 전북대학교 공업기술연구소 1997 工學硏究 Vol.27 No.-

Because of a sudden increase of vehicles, the limit of road capacity occurred. We are, therefore, constructing the road tunnels over 1km for the maximization of land use. To supply safe driving conditions in the road tunnel, we are controling the exhaust emissions with a forced ventilation facility. To carry out this study, program is constructed to fit for the road tunnel and it was simulated. The purpose of this study is to investigate the ventilation characteristics of tunnel on experimental parameters. We change the natural ventilation force and the effect of piston, also the gap of ventilation hole and the volume of ventilation. The results of this study are as follows; 1. The larger a natual ventilation force and the effect of piston, the better a ventilation efficiency. 2. The shorter a gap of ventilating hole, the better a ventilation efficiency. 3. The larger a volume of ventilation is, the better a ventilation efficiency is.

전주지방에서의 기상이 대기오염에 미치는 영향에 관한 연구

이재영,홍희택,정태섭 전북대학교 공업기술연구소 1997 工學硏究 Vol.27 No.-

The purpose of study is to find out the influence of the meterorological factros to the air pollutants in Chon-ju. In this study, the detree of air pollution anc meterorological data was used that was measurede for one year(1995.7~1996.6) in Chon-ju. The pollution datas were TSP and Sulfru dioxide(SO₂). And the meterorological data were wind direction, wind speed and preciptiation abtained from the Central Meteorogical Office. The results of study were as follows; The first, The primary wind direction were N with 33.7%, S with 26.0% and W with 19.5%. The second, the diurnal variation of air pollution was patterned according to hours. Maximal concentration was occurred between 10 and 11 A.M. and minimal concentration was occurred about 6 P.M. The third, the concentration of TSP decreased according as wind speed is to lasted with high level. But the concentration of TSP increased the moment wind speed is increased. The fourth, The level of SO₂ concentrations were decreased according to the precipitation. Finally, SO₂concentrations were low, on the contrary, when wind speed was high.

토양중에서 1,1,1-Trichloethane의 흡착 및 분해 특성에 관한 연구

김종국,홍희택 全北大學校 附設 都市및環境硏究所 1998 都市 및 環境硏究 Vol.13 No.1

Adsorption and biodegradation of 1,1,1-Trichloroethane(1,1,1-TCA) which is a common contaminant found in groundwate were investigated in soils to predict the behavior and fate of 1,1,1-TCA in the environment. 1,1,1-TCA was biotransformed in the soil to dichloroethane(DCA) and chloroethane(CA). The biodegradation rate of 1,1,1-TCA was related to the organic carbon content in soils. About 16∼91% of initial 1,1,1-TCA was transformed to DCA and CA during the experimental period. The measured biodegradation rate contants of 1,1,1-TCA were in the range of 0.004d^-1 to 0.099d^-1

환경 중에서 다이옥신류의 거동 특성

김종국,홍희택 전북대학교 공업기술연구소 2000 工學硏究 Vol.31 No.-

In this paper, we selected the sludge incinerator of paper mill as a source and estimated Dioxins(PCDD/Fs) levels. The relationships between source and environmental sample to be taken in a situation and a trend of pollution with PCDD/Fs in environment were investigated. As the result, PCdd/Fs levels of stack gas were 6.468~76.756TEQ/Nm^1, soil 0.247~2.902pgTEQ/g, scallion 0.013~0.027pgTEQ/g and sediment 0.06-0.42pgTEQ/g. On the whole, the Dioxin levels in our samples were much lower than other countries. It was found isomer distribution between stack gas and environmental sample and isomer distribution of soil, scallion and sediment which were considered to had been affected directly dry/wet deposition was similar to stack gas pattern.

양수가 대수층의 오염물질 이동에 미치는 영향

李永東,洪熙澤 全北大學校 1996 論文集 Vol.42 No.-

Transport of pollutants in a groundwater flow system is accomplished by the simultaneous action of four processes : advection, dispersion, molecular diffusion, and hydregeochemical retardation. Under advective transport, pollutants travel at the same velocity as the carrier fluid percolating through the porous medium. And if pollutants entered in a groundwater flow system, transport of pollutants is affected mainly by advection process. Therefore if groundwater vector is oriented to a well by pumping or recharging, pollutants will be effectively removed from the contaminated aquifer.

都市計劃 用度地區 指定 및 都市設計에 관한 硏究 : 新都市에 있어서 地域施設의 供給計劃에 관하여 On the Supply Plan of Regional Facilities in New Town

丁泰燮,洪熙澤 全北大學校 附設 都市및環境硏究所 1996 都市 및 環境硏究 Vol.11 No.1

This study aims to investigate actual conditions of the supply of community facilities of cities in Korea and Japan, by surveying the number of facilities per unit population, and to obtain the fundamental data for regional planning in Korea through comparative analyses. Followings are the results of this investigation : 1) High correlations are found between the population and the number of facilities. 2) The original unit of facilities are classified into four types according to the size of the population and the population density. 3) In general the original unit of facilities and the population per unit facilities hold higher level in Japan than in Korea, but some kinds of facilities stand approximately the same level in both countries.

수환경중에서 다이옥신 농도와 이성체 분포 특성

김종국,홍희택 전북대학교 공업기술연구소 2000 工學硏究 Vol.31 No.-

Dioxins are emitted from a variety of industrial process and they are apt to accumulated in environmental matrices in vicinity of sources. There exists that possibility of human exposure via food chain because by pollution of environmental matrices. In this study, we selected fishes and sediments on chon-ju river which is located near paper mill and wastewater treatment plant as a source of dioxins. Especially concentration of PCDD/DFs and a pollution level in environmental matrices were investigated. PCDD/DFs profiles of fish were strongly dependent on the sampling site and analyzed part. TEQ concentration of fish ranged from 0.106~4.282 pg TEQ/g. The concentration of sediment was detected 0.06~0.42pgTEQ/g and the patterm of sediment was similar to flue gas of incinerator. Ratio of PCDFs was higher than PCDDs in fish samples and TeCDD and PeCDD was higher relatively in PCDDs and 1234678-HpCDF was so high in PCDFs. It was found that the isomer is bioconcentrated selectively in fish. Key words: Dioxins, Profile, Isomer, TEQ, Bioconcentration