• 공학교육연구
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• 제19권2호
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• pp.70-75
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• 2016

This paper deals with a result of case study for the development of CEA(Course-Embedded Assessment) design tool for engineering education accreditation implementing programs. Many programs have been devoting efforts to apply CEA to their engineering education. In order to effectively apply the CEA to educational program, it is required to develop the standardized form or scheme for CEA application. As a preliminary approach, we propose the design tool and the result of a case study for CEA application in engineering education.

• 한국해양환경ㆍ에너지학회지
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• 제14권4호
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• pp.257-263
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• 2011

SBM을 이용하여 2006년 가막만의 담수, 염분, 영양염 등 물질 수지를 산정하였다. 담수유출량은 $-174.2{\sim}72.5{\times}10^3m^3/day$로 나타났으며 개방경계에서의 해수 교환에 의한 mixing volume은 $-2.4{\times}10^7\sim4.9{\times}10^7m^3/day$로 만 내외의 염분차이에 의해 크게 좌우 받았다. 육상기인 DIP와 DIN의 유입 flux의 범위는 397.0~1158 mole/day 및 1750~8328 mole/day의 범위로 다른 지역에 비해 낮았다. DIP의 소실 또는 생성은 물수지의 변동에 의해 크게 좌우 되는 특징을 보였으며, 또한, 물질체류시간에 의해 물질수지가 크게 좌우되어 NEM도 크게 달라지는 결과를 보였다.

• 환경위생공학
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• 제21권1호
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• pp.12-20
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• 2006

This paper was conducted concerning the degree of indoor air quality in public transport vehicles such as taxicabs, buses and subway trains, as sampled through the active participation of drivers and passengers in Seoul between 13th August 2005 and 2nd November 2005. The results were summarized as follows: 1. Among the measured substances especially respirable particulate matters ($PM_{10}$), total bacteria counts (TBC) and carbon dioxide ($CO_2$) exceeded the standard level of $150{\mu}g/m^3,\;800CFU/m^3$ and 1000ppm. 2. The concentration of carbon dioxide ($CO_2$) in taxi recorded 2491ppm, which is more than the standard amount of 1000ppm. This level was comparatively higher than all other public transportation methods. Total bacteria counts (TBC) in bus and subway recorded $1082CFU/m^3\;and\;1856CFU/m^3$, respectively. 3. The drivers who regularly work long hours showed the higher concern about contamination of the air inside the public transport vehicles and they considered it to be worse than the air outside. In contrast, the general public showed less concern about the air quality inside the public transport vehicles. However, they too acknowledged that the quality of the air inside the public transport vehicles was poor. In regards to the degree of indoor air quality in the public transport vehicles, a counterplan must be implemented urgently to effectively combat the excessive levels of $PM_{10}$, microorganism and $CO_2$. We need to gather more conclusive evidence pertaining to other possible contaminants and influencing factors.

• 한국물환경학회지
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• 제31권3호
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• pp.295-303
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• 2015

In Korea, Total Maximum Daily Loads(TMDLs) has been enforced to restore and manage water quality in the watersheds. However, some assesment of implementation plan of TMDLs showed that the achievement of the target water quality is not related to the proper allocation loads because difference of flow duration interval. In the United States, the discharge loads are determined by water quality modeling considering standard flow conditions according to purpose. Therefore, this study tried to develop the allocation method considering economical efficiency using water quality model. For this purpose, several allocation methods being used in the management of TMDLs is investigated and develope an allocation criteria considering regional equality and uniformity. Since WARMF(Watershed Analysis Risk Management Framework) model can simulate the time varying behavior of a system and the various water quality variables, it was selected for a decision support system in this study. This model showed fairly good performance by adequately simulating observed discharge and water quality in Miho watershed. Furthermore, the scenario simulation results showed that the effect of annual average water quality improvement to remove 1kg BOD is more than 25 times, even if point pollutants treatment facility is six times more expensive to operate than non-point pollutants treatment facility.

• 환경영향평가
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• 제12권4호
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• pp.259-270
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• 2003

To investigate the water quality and the pollution state of lower Yeongsan river system, 38 water samples were taken from the main stream of the Yeongsan river, Gomakwon and Hampyeong streams of the system in dry and flood seasons, May and August, 2001. The Yeongsan river is typically natural in accordance with pH-& diagram. But the chemistry based on Piper's diagram indicates that the river is influenced by seawater. BOD increases as the sampling sites are approaching the downstream in Gomakwon and Hampyeong streams overwhelming WQS V grade of 12.40mg/l. T-N and T-P of the river are mainly loaded not in above branch streams but in the main stream of the river, which are caused by manure for farming, domestic animal discharges and life-sewage, in possible. Meanwhile, heavy metal contents are below WQS or not detect in whole water samples. So, it shows that the above river waters be polluted by not industrial but life/agricultural foul waters.

• 한국안전학회지
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• 제30권5호
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• pp.86-91
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• 2015

It is important to provide the farmers with practical and effective information of safety and health for individual crop to prevent or reduce occupational injuries in agricultural sector, since work characteristics and risk factors are not the same for all crops. In this study, risk assessment was carried out for cultivating shiitake mushrooms and then safety measures, which were based on the results of the risk assessment, were summarized and presented as the information of safety and health of shittake farmers. Guidelines for safety and health of the farmers of shiitake mushrooms, which were developed based on the risk assesment and safety measures, can be used by the farmers as self-educational tools or by the agricultural facilitators as an educational material for agricultural safety. It is expected that the guidelines can be useful in preventing occupational injuries of shiitake farmers.

• 한국환경과학회지
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• 제25권4호
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• pp.603-613
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• 2016

Fog may have a significant impact on road conditions. In an attempt to improve fog predictability in Jeju, we conducted machine learning with various data mining techniques such as tree models, conditional inference tree, random forest, multinomial logistic regression, neural network and support vector machine. To validate machine learning models, the results from the simulation was compared with the fog data observed over Jeju(184 ASOS site) and Gosan(185 ASOS site). Predictive rates proposed by six data mining methods are all above 92% at two regions. Additionally, we validated the performance of machine learning models with WRF (weather research and forecasting) model meteorological outputs. We found that it is still not good enough for operational fog forecast. According to the model assesment by metrics from confusion matrix, it can be seen that the fog prediction using neural network is the most effective method.

• 한국환경보건학회지
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• 제8권1호
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• pp.13-23
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• 1982

This Study was designed to investigate Traffic condition, Traffic Noise level, Traffic Noise Index (TNI) and Response for dissatisfactions of residents as part of assesment of Noise by 12 Sites in Seoul from July 1st to the end of August 1981. As the resut of this Study, the following Conclusion were obtained 1. The mean traffic Volume of Seoul was 3076/hour ranging 1440/hour to 5772/hour. 2. The range of Road Traffic Noise Level in Residential area was from 73.0dB (A) to 80.2dB (A). The highest level was 80.2dB (A) on Heugseog-dong and the lowest level was 73.0dB (A) on Suyu-dong. 3. Comparision of Road traffic noise level in the day and evening, the range of traffic noise level in day was from 73.9dB (A) to 80.2dB (A), and evening was ranging 73.0 to 79.9dB (A). 4. The range of TNI in Residential area was from 77.5 to 100.0. The highest TNI was 100.0 on Suyu-dong including Heugseog-dong, the lowest TNI was 77.5 on Hyuikyung-dong. 5. Respose of Noise by 360 householders has been examined in Residential Area: Sourse of Noise Causing bothersome to residents was 52.5% of traffic, the types of road traffic Cousing annoyance to residents residents were 84.8% of passing cars and 81.1% of horns, and 71.7% of reading interfered and 68.1% appeal dissatisfactions due to the sleeping disturbance by road traffic noise.

• 한국환경복원기술학회지
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• 제23권1호
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• pp.37-48
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• 2020

This study was aimed to design core areas applied by the global conservation criteria to promote the public awareness to the protected areas and the value cognition of the Key Biodiversity Areas (KBAs), targeting the Mt Seorak, according to the designation of globally important biodiversity areas. As a method for carrying out this study, the biota were cataloged through literature reviews and field trips. With applied by the Global Red List criteria of the International Union for Conservation of Nature (IUCN), only nine species were categorized in the studied area; plants were classified into six species as follows: Megaleranthis saniculifolia ohwi, Bupleurum euphorbioides Nakai, Hanabusaya asiatica Nakai, Thuja koraiensis Nakai, Leontopodium leiolepis Nakai, Androsace cortusaefolia Nakai, fish was classified one species as follow: Pungitius sinensis Tanaka, and the mammal was classified as two species as follows: Hydropotes inermis, Naemorhedus caudatus. According to the occupation area (EoO, Extent of Occurrence) and Minimum Viable Population(MVP), the size of protected area was 234.56㎢ for plants, 235.07㎢ for mammals, and 0.14㎢ for fish, and the Key Biodiversity Area (KBA) of Mt. Seolak suggested as 286.72㎢.

• 분석과학
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• 제13권4호
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• pp.520-533
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• 2000

고분해능 가스크로마토그래프/고분해능 질량분석기를 이용하여 도시지역과 공업지역에 거주하는 산모로부터 채취된 초유에서 PCBs 및 PCDD/FS를 분석하였다. 모유에 오염되어 있는 평균 PCDD/FS와 PCBs의 농도는 각각 15.13 TEQ pg/g fat과 5.64 TEQ pg/g fat이었다. 본 연구 결과, 거주지역과는 무관하게 서로 다른 두 경향을 보이는 동족체(homologue) 분포를 발견하였다. 각 분포의 이성질체를 상업적으로 판매되었던 PCBs 생산품의 조성과 비교하여 동족체 분포에 대한 고찰을 했다. 초산모의 평균 PCDD/Fs 농도인 20.84 TEQ pg/g fat을 기준으로 영유아의 1일 PCDD/Fs 섭취량을 계산했을 때 60 TEQ pg/kg/day의 값이 산출되었다. 이 값은 미국에서 계산된 1일 성인 PCDD/Fs 일반 노출 양인 1-3 TEQ pg/kg/day보다 훨씬 높은 값이다.