도로변 인구밀집지역의 교통 소음에 관한 연구

최형일,정경훈,박치홍 조선대학교 환경연구소 1995 環境公害硏究 Vol.12 No.-

This study was carried out measuring and analyzing the traffic noise at centering of Bongsun, Munheung and Weolgok section where the population massed zones were by road side in Kwang Ju. From May 1993 to April 1995, in order to provide the basic data for the establishing efficiency and economical countermeasuring of traffic noise. The results were as follows ; 1. It was showed that equivalent sound level(Leq) of Bongsun section approached 64dB(A) and that of Munheung and Weolgok section was appeared highly 69-74dB(A) during day time (06:00-22:00) ; environmental criteria of noise is 65dB(A). Where as, that of Bongsun section exceed environmental criteria of noise with 57dB(A) and that of Munheung and Weolgok section exceeded greatly environmental criteria of noise with 67-69dB(A) during night time(22:00-06:00) ; environmental criteria of noise is 55dB(A). 2. The noise pollution level(LNP) of Bongsun section was 74dB(NP) and that of Munheung and Weolgok section were 80dB(NP), 83dB(NP) during day time. Also, that of Bongsun section was 7ldB(NP) and that of Munheung and Weolgok section was 82dB(NP) during night time. In this place, we know that there were no many differences between day and night time and it was showed highly in Munheubg and Weolgok section. 3. The Traffic Noise Index(TN1) of Bongsun section was 65, that of Munheung 69 and that of Weolgok 80 during day time and that of Bongsun was 72, that of Munheung 83 and that of Weolgok 85 during night time. So it was a large variation between day and night time and was showed highly in Munheung and Weolgok section. Therefore, it got to damage for the daily living of the residence. 4. The correationship between LNP(X) and Leq(Y) were Y=0.8959-0.8970 (R2=0.7959) during day time and Y=0.9231X-8.3333 (R2=0.9082) during night time. Correlation coeffcient(r) were 0.8921 during day time and 0.9530 during night time. So, this data was indicated that traffic noise was the main source of city noise pollution. 5. When we open the window, the traffic noise was affected seriously on our daily living according to the questionnaire about disturbing for living against the traffic noise. Especially, it showed that the disturbance of listening phone was 52%, TV and Radio listening 50% and reading or thinking 71%. So, it was estimated that we need for the countermeasuring of traffic noise. 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 enlightement activity in order to reduce sound by improvement of how to drive.

축산분뇨 공공처리장의 공정별 악취

최형일,이종국 한국냄새환경학회 2011 실내환경 및 냄새 학회지 Vol.10 No.2

본 연구는 축산분뇨 공공처리장 2곳의 각 공정별 악취원 종류 및 농도, 그리고 복합악취를 조사하였다. A, B시설에서 공통적으로 악취가 높게 발생한 것은 전처리 시설이며 수처리시설에서도 적용 공정의 종류에 따라서 악취농도가 다르게 나타났다. 농도나 영향면에서 가장 높은 악취물질은 황화수소이었으며 전반적인 공정에서 공통적으로 높게 나타났다. 방지시설인 세정탑에서의 효율은 매우 낮게 나타났으나 NaOH에 의한 약액세정으로의 운전전환 후 효율이 크게 개선됨을 알 수 있었다. The complex odor, odor materials and its concentration of each process were investigated in the two public livestock waste treatment plants. In the pre-treatment process, A and B facilities were same as high odor in the pretreatment processes, but the results were different from each other because of the different water treatment process. In the aspect of concentration and impact, hydrogen sulfide was a major odor compound in the overall processes commonly. The removal efficiency of odor of conventional scrubber was very low, but it was found that significantly improves efficiency after operation switching by the addition of NaOH.

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.

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.

건설공사로 인한 소음·진동 민원대책에 관한 연구

최형일,정경훈 조선대학교 환경연구소 2001 環境硏究 Vol.17 No.2

Urban construction work has been caused much annoyance recentry. But construction noise standard of our country is inefficient. Especially, diesel pilling method has caused much problem of highly impactive sound and vibration. Construction works, in order to solve these problem, using oil pressure method of low noise and low vibration equipment. Practical solution for the construction equipment noise, however, are very difficult because of the lack of basic data and insufficiency of the existing research. In this point, this study attempts to surveys the characteristics of attenuation and propagation of construction noise in pillings work using oil pressure method. And this study intends to get the basic data for establishment of a standard about construction equipment noise.

광주공항 주변의 소음도 분포 조사 연구

최형일,정경훈 조선대학교 환경공해연구소 2000 環境公害硏究 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 is 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 1000~2000Hz band, compared to that of civilian passenger airliners and noise level is higher by over 20dB. 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.

건설공사로 인한 소음·진동 민원대책에 관한 연구

최형일,정경훈 조선대학교 환경공해연구소 2001 環境公害硏究 Vol.17 No.2

尤甚地域의 交通騷音度 調査硏究 : 光州空港 周邊의 航空機騷音

崔炯一 조선대학교 환경연구소 1990 環境公害硏究 Vol.7 No.-

This study investigates the measurement and investigation of aircraft noise around Kwangju Airport and the investigation of the respondent degree due to the questions to students and the results are as follows: 1. In the subject area of investigation, 70 that is the estimate value of the aircraft noise (WECPNL) in the living areas which the International Standard Organization encourages exceeded 115 in only 14 places out of 26 places and manifested low 2-28 degree in 12 places. 1. 3 schools out of what measured and investigated exceeded WECPNL 70 which the International Standard Organization encourages. But in the feeling degree of aircraft noise, the dissatisfaction manifested the most 43%. Consequently it manifested which affects the class in the season that instructs with opening window by the result analysis of respondent degree due to the questions. 1. Like these, as unseen pollution, the aircraft noise hinders iu all activity of everyday to the people who lives in the place around airport like consideration in chapter Ⅱ, besides the damage is serious and enormous psychically, psychologically and physiologically. It is considered that the reasons are the approach of airport to the downtown and lack of understanding about the noise pollution. 1. The ideal method for reduce the effect of aircraft noise move the airport but it is difficult economically, locally in a short time. Therefore, it is necessary for the safety service and soundproofing, moving, the wall foundation for soundproofing, the preparation of forest zone, and must be widen the buffer greenbelt with expansion and appointment of the development restriction area which already appointed, in the effective area of noise it is required for the basic preventive measure such like control or prohibition of new housing construction.