광주공항 주변의 소음도 분포 조사 연구

최형일,정경훈 조선대학교 환경연구소 2000 環境硏究 Vol.16 No.1

This study investigates the measurement and analysis of aircraft noise around Kwang-ju airport the results were as follows: The Flights per day at the Kwangju Airport are about 20 for civilian passenger airliner and about 40 for military plane but since military planes have irregular flight schedules and frequency, their operation is flexible according to military operations and other conditions. The noise of airplane around the populated area of the Airport indicates a serious situation of around 85 WECPNL in Woosan-dong, Songdae-dong and Shinchon-dong. Noise levels are within the expected noise pollution limits in dukheung-dong, Chipyung-dong and Bonduk-dong. Airplane noise in the density populated areas is lower than 80 WECPNL, the expected the noise pollution levels, and that for military planes higher than that of civilian passenger airliners by 10 WECPNL and that of Woosan district is the highest of the three districts. In general, the frequency spectrum of military planes is around the 1000∼2000㎐ band, compared to that of civilian passenger airliners and noise level is higher by over 20㏈. This is why the sound of the military plane is much louder and sharper, and it occurs in the frequency band causing sensitive response upon being heard.

사격장 소음에 관한 연구

최형일,정경훈,정원삼,박싱일,김난희 조선대학교 환경공해연구소 2006 環境公害硏究 Vol.19 No.1

These days, the way of life and peoples' values have been changing in a developing society. The noise pollution in residential areas is a serious problem caused by the drift of population to cities, increased density, and heavy traffic. The firing ranges, which were built 20 or 30 years ago, are required facilities but are threatening to people. They are a source of anxiety as they jeopardize the residents' safety and destroy their living. Because of this, problems arise often. To reduce the problems between the residents and the military, the sound level around the firing range, the location of the range, and training times are investigated as the following 1. When a howitwer is fired, if there is no obstacle, at distances of 70m and 120m, the equivalent noise level is +116㏈(A)Leq and 98.6㏈(A)Leq, respectively. When the distance is 120m, the maximum sound pressure level is 123㏈(A)Leq for a period of one second. 2. When a 105mm howitwer is fired, if there is a hill as a natural sound barrier and the distance between the firing location and the target location is far more than 900m. the equivalent sound level is below 62㏈(A)Leq. 3. Upon firing, the sound pressure levels have equal range. The sound level is higher at 500Hz and lOOOHz. 4. The sound pressure level of the noise of explosive sound decreases between the shooting point and the target point. At distances of lOOOm, 1400m, and 1450m, the equivalent sound levels are 86.2㏈(A)Leq, 85.4㏈(A)Leq and 84.2㏈(A)Leq each, and the highest sound pressure levels are 121.4㏈(A)Leq, 116㏈(A)Leq and 114.3㏈(A)Leq for one second. 5. The explosive sound at the target point is similar to the noise at the firing point. The sound pressure level also has an equal range. Also. the sound level is higher at 500Hz and 1OOOHz than the others.

수경재배 작물의 유해성 중금속 흡수능에 관한 연구 (Ⅰ) : 미나리 무우나물 중심으로

최형일 조선대학교 환경연구소 1989 環境公害硏究 Vol.6 No.-

This study was carried out to investigate the heavy metal absorption of water culture crops. The contents of Cd, Pb were determined by atomic absorption spectrophotometry and Hg was determined by reduction gasfication method, the results were as follows; 1. The growth of rate in oenanthe japonica was better than radish green. 2. The contents of Cd, Pb, and Hg in oenanthe japonica were relatively higher than radish green.

광주시 도로방음벽 실태 조사에 관한 연구

최형일,정경훈,정숙희 조선대학교 환경연구소 1998 環境硏究 Vol.14 No.1

Our has been advanced in the organization of society with rapid industralization for more over 30 years. Gravitation of the population and traffic increase made change in life style and brought about a lot of noise pollution which is not able to be confirmed in sight. The damage of traffic noise will be a serious problem, so the effective and economical countermeasuring of noise will be proceeded when we build up a large building or housing complex and it also needs enlightment activity in order to reduce sound by improvement of how drive. So, It is possible to be suggested as follows 1) Enforcing the every-ten-day limit on auto usage continuously. 2) Expended execution of noise restriction area. 3) Improvement of procedure in parceling-out. 4) Establishment of walfare facilities on the road side. 5) Application of matrial excluded the outside sounds in the construction on road side. If we consider environmental city condition at the construction and city planning, it is possible to minimize the noise pollution, to make a pleasant environment and to contribute the national health improvement.

低溫에서의 活性슬럿지법에 의한 有機性廢水 處理

崔炯一,申大允,鄭京勳 조선대학교 환경연구소 1991 環境公害硏究 Vol.8 No.-

The activated sludge treatment for the synthetic waste water was investigated under low temperature of 5℃ and the results were as follows ; 1. In the case, of the synthetic waste water of peptone was used the COD removal was unstable. 2. In the synthetic waste water of starch, we could found that pH was stable and the COD removal was about 83%. 3. Inspite of change of MLSS on the activated sludge the constant COD removal was obtained. 4. When the synthetic waste water was treated for long term in the activated sludge the SVI was increased gradually. 5. Non filamentous flocculation on the activated sludge was transformed into filamentous bulking floc. 6. Bioflocculation formed on the activated sludge was small compared with that of conventional activated sludge.

해안 저질토중 중금속과 유기물질의 오염에 관한 연구

최형일,정경훈,김인수,송영일 조선대학교 환경연구소 1994 環境公害硏究 Vol.11 No.-

The contents of heavy metals and total organics in bottom mud of the Mokpo marine have been investigated. This area was divided into three regions; Daebul, Mokpo, and Sanjung, and sampling sites region were selected by eight sites. Marine bottom mud mere investigated three times during this study and twenty-four samples are taken from eight sampling sites. Analytical species were Cdmium, Copper, Lead, zinc, Arsenic and total organics. The Heavy metals were analyzed by atomic absorption spectrophotometry, also total organics were analyzed by gravimetry. The major resurts of the studies were as follows: 1. The contents of the heavy metals and total organics in marine bottom mud were Cadium 0.272 mg/kg, Copper 3.384 mg/kg, Lead 9.647 mg/kg, zinc 10.031 mg/kg, Arsenic 0.636 mg/kg, Total organics 5.99 wt%. 2. The Zinc was higher than any other heavy metals in the marine bottom mud. The mean contents of heavy metals in Sanjung region was the lowest. 3. Lead and Arsenic species were influenced by the pollutants influxed from Youngsan River, and Cadium and Copper were less than it's contents of the natural soils. 4. The total organics in the marine bottom mud was exceedingly increased as the contrasted with the small particle size of the marine bottom mud, and the corelation coefficients between heavy metals and total organics were high. (0.5<r<0.8)

榮山江流域의 畓土壤 및 玄米中金屬含有量에 관한 調査 硏究

최형일 조선대학교 생산기술연구소 1991 生産技術硏究 Vol.13 No.2

To investigate heavy metal contents of PADDY SOIl and BROWN RICE around the YOUNG-SAN RIVER AREA, we divided this area into 4 group, in DAM YANG, KWANG SAN, NA JU and HAM PYONG and selected 11 locations in these groups. PADDY SOILS were investigated 4 times and SOIL Samples were 44. soils from 11 locations. BROWM RICE samples were 11 rices from 11 locations. The heavy metal contents of these samples were analysed by environmental pollution process experimental method and analysis elements were cadmium, copper, lead, zinc, arsenic. The results were summarized as follows. 1. The cadmium contents of soluble heavy metal in Paddy soils were 0.351ppm, copper was 3.474-ppm, lead was 4.687ppm, zinc was 11.728ppm, arsenic was 0.781ppm. 2. The cadmium contents in BROWN RICE yielded in rice field was 0.128ppm, copper was 1.442ppm, lead was 0.353ppm, zinc was 15.211ppm, arsenic was 0.061pprn. 3. The results showed that heavy metal contents in paddy soil was below crops produce standard and cadmium, copper, arsenic in BROWN RICE were considerable below normal estimated crops and ADI.

미세형상 내부 기체유동의 수치모사

최형일,이동호,이도형 한국항공우주학회 2004 한국항공우주학회 학술발표회 논문집 Vol.- No.-

알루미늄 부식을 적용한 활성슬러지법에서 질소 및 인 제거

최형일,정경훈,박상일,백계진,Choi Hyung Il,Cheong Kyung Hoon,Park Sang Il,Paik Ke Jin 한국환경보건학회 2005 한국환경보건학회지 Vol.31 No.2

A laboratory experiment was performed to investigate simultaneous removal of phosphorus and nitrogen from raw sewage by intermittently aerated activated sludge process packed with aluminum and silver plate. Two continuous experimental process, i.e. an intermittently aerated activated sludge process, and an intermittently aerated activated sludge process with an aluminum and silver plate packed into the reactor were compared. The pitting corrosion of aluminum does not affect the performance of the biological treatment. The amounts of Al eluted from aluminum plate 17 mg to 60.6 mg in this experimental conditions, and Al/P mole ratio were from 3.31 to 11.25. The total nitrogen removal efficiency in Run E were $60.6\%$ at the HRT of 12 hours. The effluent $PO_4-P$ concentration as low as $1.0\;mg/\iota$ could have been obtained during the continuous experiment in Run E at HRT of 12 hours.

후처리과정을 이용한 양질의 삼각격자 생성법

최형일,이동호,이도형 한국항공우주학회 2004 한국항공우주학회 학술발표회 논문집 Vol.- No.-