• 한국지하수토양환경학회지:지하수토양환경
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• 제25권2_spc호
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• pp.16-27
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• 2020

Nitrate contamination has received much attention at local as well as regional scales. The domestic situation is not out of exception, and it has been reported to be very serious, particularly within agricultural areas as a result of excessive usage of nitrogen fertilizers. Meanwhile, nitrate can be naturally attenuated by denitrification in subsurface environments. The denitrification occurs through biotic (biological) and abiotic processes, and numerous previous studies preferentially focused the former. However, abiotic denitrification seems to be significant in specific environments. For this reason, this study reviewed the previous studies that focused on abiotic denitrification processes. Firstly, the current status of nitrate contamination in global and domestic scales is presented, and then the effect of geological media on denitrification is discussed while emphasizing the significance of abiotic processes. Finally, the implications of the literature review are presented, along with future research directions that warrant further investigations. The results of previous studies demonstrated that several geological agents could play a vital role in reducing nitrate. Iron-containing minerals such as pyrite, green rust, magnetite, and dissolved ferrous ion are known to be powerful electron donors triggering denitrification. In particular, it was proven that the rate of denitrification by green rust was comparative to that of biological denitrification. The results indicate that abiotic denitrification should be taken into account for more accurate evaluation of denitrification in subsurface environments.

• 한국지역지리학회지
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• 제7권4호
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• pp.120-145
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• 2001

현대사회는 흔히 '위험사회'로 개념화되며, 이러한 위험들 가운데 특히 환경적 위험은 심각하게 만연되어 있다고 하겠다. 환경적 위험을 안고 있는 환경위기는 전통적 사회에서 볼 수 있는 자연재해와는 달리, 그 발생 및 대응과정이 기술적 통제와 관련된다는 점에서 기술적 재해라고 할 수 있다. 그리고 환경위기는 정부와 시민사회의 대응의 한계로 인해 재발되는 경향이 있다. 이러한 점에서 환경적 위기의 발생과 그 대응과정은 현대 사회체제 속에 이미 내재되어 있으며, 특히 자본주의적 시장경제와 관련된 이윤 추구 및 비용절감, 관료주의적 대의정치와 관련된 권력집중화와 책임회피, 도구주의적 과학기술로 인한 과학적 지식에 대한 맹신과 불확실성, 그리고 개인주의적 생활양식과 관련된 배타적 대응과 수동성 등으로 특징지워 진다고 할 수 있다. 본 논문은 1991년 대구에서 발생한 페놀오염사고와 1998년 시드니에서 발생했던 물오염 위기를 사례로, 이러한 현대 사회의 4가지 기본 요인들에 의한 환경위기의 발생과 그 대응 과정에 관하여 고찰하고 있다.

• 한국항해학회지
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• 제19권2호
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• pp.77-97
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• 1995

The protection of the marine environment is one of the main international legal problems in recent years. In parallel with the industrial development, a great quantity of chemical materials were used and in consequence, mass transportation of oil and other dangerous materials was required on the one hand, and discharge of industrial wasters drew also the attention on the other hand. Furthermore, oil tankers accidents, mass use of nuclear materials, sea-bed exploration and exploitation stimulated further deep human concern on the marine environment. The expansion of international concern to new and more dangerous sources of marine pollution regarded more strict and legal control on the Oil Tanker(DWT 95, 000tons, Cb=0.805) model. Calculation results are compared to the international, especially regional level. In particular, this study is concerned with the preservation of the Northeast Asian Seas surrounded by Japan, the Russian Far East, South Korea, North Korea, China and Taiwan. These adjacent countries must intensify cooperation regarding the prevention, reduction and control of the contamination of the sea. And this cooperation between the States concerned should, as much as possible, be aimed at maximizing the effectiveness of measures to prevent or abate transboundary environmental pollution. To achieve this purpose, States concerned should be imposed upon duties such as duty to assess the environmental impact, duty to inform, duty to consult and duty to assist on the basis of general principle of international law, international customary law and other various resolutions of international bodies. Depending on the nature and extent of actual or potential transboundary pollution with the use of a natural resource or the environment in general the establishment of some form of institutionalized cooperation between the States concerned may become useful or indispensable. The functions of this Organization are, inter alia, to keep the implementation of the Convention and the protocals under continuous observation, to make recommendations on regional or sub-regional rules and standards to be elaborated and on measures to be taken by the Contracting Parties, to be notified of any grave and imminent danger from pollution or threat of pollution by the Contracting Parties and to promote in close cooperation with appropriate governmental bodies additional measures to protect the marine environment of the Northeast Asian Seas, and so on. Above mentioned countries, first of all, are located within the Northeast Asian Seas geographically and, therefore, take responsibilities of preserving the clean sea against marine interferences regardless of any difference of the social, political and economic systems. They must be followed under the UNCLOS and other marine conventions. Under the present circumstances, Northeast Asian Seas will become dead seas in case that there is no instant and prompt action against pollution. Hence we have an absolute obligation to promote the development of the mandatory international environmental law, which in turn can faciliate more effective implementation of the regional cooperation by the neighbouring states within this area.

• 한국식품위생안전성학회지
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• 제25권4호
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• pp.395-401
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• 2010

본 연구에서는 채소류 등(양파, 오이, 마늘, 풋고추, 참깨) 5품목에 대한 납, 카드뮴 기준 규격 설정을 위해 다소비 유통 채소류 중에서 양파, 오이, 마늘, 풋고추, 참깨 총 378건을 전국 9개 권역(경기, 강원, 경남, 경북, 전남, 전북, 제주, 충남, 충북)에서 수거하고 각 시료를 microwave 분해법으로 전처리하여 납 및 카드뮴 함량을 ICP-MS로 분석하였다. 모니터링 결과, 채소류 등의 납의 평균함량은 양파 0.010 mg/kg, 오이 0.018 mg/kg, 마늘 0.012 mg/kg, 풋고추 0.027mg/kg, 참깨 0.029 mg/kg이었으며, 카드뮴의 평균함량은 양파 0.006 mg/kg, 오이 0.002 mg/kg, 마늘 0.008 mg/kg, 풋고추 0.011 mg/kg, 참깨 0.024mg/kg이었다. 본 결과는, 채소류 Codex(국제식품규격위원회) 기준인 납 0.1 mg/kg, 카드뮴 0.05 mg/kg과 비교해 볼 때, 모든 검체에서 기준보다 낮은 수준이었고, 참깨는 국내외적으로 카드뮴의 기준이 설정되어 있지 않으나, 채소류의 Codex(국제식품규격위원회) 카드뮴 기준보다 낮은 수준을 나타내었다. 위해성 평가 결과, 2005년 국민건강조사 DB에서 조사대상 인구집단 전체를 대상으로 한 연구대상식품의 섭취량을 고려하여 산출된 채소류(양파, 오이, 마늘, 풋고추, 참깨)의 납의 인체노출수준은 $1.3{\times}10^{-4}\;{\mu}g/kg$ bw/day(평균섭취)~$5.1{\times}10^{-4}\;{\mu}g/kg$ bw/day(극단섭취)이었고, 카드뮴의 인체노출수준은 $7.5{\times}10^{-5}\;{\mu}g/kg$ bw/day(평균섭취)~$3.6{\times}10^{-4}\;{\mu}g/kg$ bw/day(극단섭취)이었다. 연구 대상 식품들의 위해지수를 산출한 결과. 모두 1.0 이하의 매우 낮은 수준으로 유해영향 발생이 우려 되지 않는 수준으로 나타났다.

• 지질공학
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• 제3권3호
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• pp.253-266
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• 1993

본 연구에서는 수자원 관리와 보호를 위하여 1차적으로 연구지역에 지표유출량과 지역층 진량이 계산되어 물 수지분석이 이루어진 후, 분석된 유출량 및 층진량 계수들은 GIS를 이용하여 설계된 환경지질정보시스템(Environmental Geologic Information System : EGIS)내에서 지하수 자원 보호를 위한 GIS모델의 중요 요소로써 재처리되어 최종적으로 지하수의 광역절 오염 가능성 분석을 가능케 하였다. 이를 위하여 작성된 실 지표유출량 분석도와 광역적 지하수 오염 분석도는 수자원 관리와 보호를 위한 필수 사항들이며, 많은 양의 환경정보들이 시스템내에서 수치화, 분석 및 처리과정을 거쳐 생산되었다. 환경정보 데이타베이스구축은 본 환경지질정보 시스템을 이용하여 체계적, 조직적으로 수행되어졌으며, 금번 연구를 위하여 구현된 환경지질 정보시스템 기술은 국가의 자연 관리를 위한 기초 연구로서 활용될 것이다.

• 한국환경보건학회지
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• 제46권5호
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• pp.599-609
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• 2020

Objectives: Coronavirus disease 2019 (COVID-19) first emerged in December 2019 in Wuhan, China, and has rapidly become a global pandemic with over 26.4 million confirmed cases and approximately 871,000 fatalities worldwide as of this writing. In the Republic of Korea, disease clusters frequently occurred in long-term care hospitals where the majority of residents are elderly with underlying medical conditions. Despite the fact that public health authorities and local community health centers have put tremendous efforts into preventing the spread of disease, positive cases have continued to occur. Thus, the Korea Centers for Disease Control & Prevention rapid response team decided to conduct an environmental investigation of a long-term care hospital to identify whether environmental contamination has remained and contributed to the spread of COVID-19. Methods: An environmental investigation was conducted at Hospital A. The characteristics of the facility and its HVAC system were assessed by checking the layout and interviewing the people in charge. A total of 64 surface samples were collected from areas of concern, including patient rooms, toilets, elevators, and nurses' station. These samples were tested by a regional health and environmental research institute using real-time reverse transcription polymerase chain reaction. Results: All samples from Hospital A were confirmed to be negative. Through interviews with high-level personnel at the regional community health center, we found that extensive disinfection is frequently performed on potentially contaminated areas in Hospital A in accordance with government guidelines. Conclusion: The environmental control measures implemented in Hospital A had been sufficient for mitigating the risk of further infection, suggesting that such measures may also be effective for other long-term health care facilities.

• 한국대기환경학회지
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• 제28권3호
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• pp.273-281
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• 2012

The government is carrying forward a sustainable development which reduces green-house gas and environmental pollution by preparing 'Low Carbon Green Development' policy basis as a new paradigm of national development. This study aims to understand the status of atmosphere contamination which Seoul has by finding correlation among social, economical indexes and carbon, the humanities and social characteristic materials which best express types of city and correlation and to suggest implications. According to the results of the analysis, first the carbon emission volume of Seoul recorded 0.56 ppm, Jongno, Jung-Gu, Kuro, Kangnam and Songpa were more than the average of Seoul and Kwangjin-Gu & Kangbuk-Gu, relative north east regions, Yeongdeungpo-Gu and Dongjak-Gu, south west regions showed lower CO occurrences. Second, according to the correlation and factor analysis, elements which affect CO emission volume of Seoul are largely represented by regional level, traffic level and development density level. Third, when the importance of influence factors based on the analyzed standard coefficient by a regression model, traffic and development density level were most important by recording traffic level (0.967), environmental level (0.385), regional level (0.530) and development density (0.561). Consequently, it was revealed that the traffic level most affected CO emission.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1999년도 국제 심포지엄 Proceedings of International Symposium on 친환경농업과 기계화방향
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• pp.137-159
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• 1999

Over the last three decades, Korean farming system has been directed to maximum agricultural production and to increase farmer's income through adoption of high-yielding crop varieties and high input of agrochemicals . These farming practices have resulted in problems of water-quality deterioration, soil degradation , and food safety. At present, over 40 million tones of animal waste are bing produced annually, which amounts to disposing the waste at the annual rate of 20 tones per ha in the total area of farming land in Korea. Nearly a half of total available water resources is used as irrigation water predominantly for rice paddy field. Thus, non-point source contamination of the water resources has been linked to agriculture across the nation. However, the extent to which agriculture contributes to the water quality is not fully known. Recently, Korean government provided various institutional measures to reduce the negative impacts of agricultural practices on the environ ental quality, and the Agricultural Environment Act was also passed by the legislature in 1998 and became effective January 1999. This Act does not cover the broad spectrum of the sustainable agriculture ; thus, the limited incentives within this Act are arguably ineffective to control the non-point source pollution. Recently new bulk blending of fertilizers(BB fertilizer) are bing produced (100, 000 tones in 1998) with Government subsidies. The BB fertilizers are to balance N-P-K ratio in the soils . Although the use of the BB fertilizers are encouraged with Government subsidies, non-point source pollution is still serious and will become worse. Precision farming is regarded as a new means for sustainable agriculture. It is a new technology that modifies the existing techniques and incorporates new one such as GIS, GPS , differential applicator to produce a new set of tools for the farmer to use. Precision farming, however, has constraints for individual farming practices. For exam le , farm size or parcel unit of each farmer is too small to adopt the precision agriculture on farmhouse-hold bases and farmer's ability to adopt the new technology is limited. However, it would be appropriate to establish local or regional cooperatives to operate such a precision farming system. It is recommended that Government provide sufficient incentives to help establish local and/or regional cooperatives.

• 농업과학연구
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• 제42권2호
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• pp.99-103
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• 2015

Potato virus T (PVT) is a plant pathogen in the family Betaflexiviridae, group IV single-stranded positive sense RNA viruses. The major host of PVT is potato, and it has been reported in Ullucus tuberosus, Oxalis tuberosa and Tropaeolum tuberosum. This study aimed at developing reverse transcription (RT)-polymerase chain reaction (PCR) and nested PCR techniques for specific detection of PVT. Finally, Two RT-PCR primer sets were developed and verified. The RT-PCR products were amplified to 734 (PVT RT-PCR primer set 6) and 828 bp (PVT RT-PCR primer set 29) long to detect PVT. The nested PCR primer sets [PVT-N70/C20 ($734{\rightarrow}315bp$) and PVT-N75/C30 ($828{\rightarrow}529bp$)] were developed which are high sensitivity and verification for detection of PVT. Furthermore, a modified-positive control plasmid is use to verify contamination of laboratory in PVT detection. This study supported the diagnose PVT in potato or PVT related hosts.

• 한국환경과학회지
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• 제14권4호
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• pp.435-444
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• 2005

A survey was conducted to 890 radiological technologists working at 44 general hospitals of 16 cities and provinces across the county to determine their stress level according to regions divided into the capital city, metropolitan areas and small- and medium-sized cities. For this purpose, such factors as their working environment, role playing, job conflict and job burden were compared and analyzed according to the regions. The findings may be summed up as follows: 1. In terms of working environment, radiological technologists in the capital city were found to have the least stress(23.46), followed by those in metropolitan areas(24.53) and small- and medium-sized cities(24.85). There was a significant difference according to the regions as for the item 'worry about influence of radioactive contamination(genetic, decisive and plausible)(P<0.001). 2. As for role playing, radiological technologists in small-and medium-sized cities appeared to receive the highest stress(l8.25) followed by metropolitan areas(l7. 71) and the capital city(l6.69). There was a statistically significant difference(P<0.001) according to the regions 3. Regarding job conflict, those who work in small- and medium-sized cities turned out to get the highest stress(15.66) compared to those in metropolitan areas(15.35) and the capital city(l4.44). In terms of job autonomy, there was no significant result from the survey in spite of the difference between metropolitan areas(14.87), small- and medium-sized cities(l4.79) and the capital city(l4.66). 4. Little difference was detected according to the regions as far as the job burden(excessive or too little) was concerned. But their was a significant regional difference in tenns of patient-related factors with the capital city(11.50), small- and medium-sized cities(l0.75), and metropolitan areas(1.63)(P<0.001).