• 터널과지하공간
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• 제10권1호
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• pp.80-91
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• 2000

석회석의 노천 채굴법은 갱내 채굴법에 비하여 채수율, 품위조절, 원가, 안전면에서 유리한 것으로 인식되고 있으나 발파로 인한 지반진동, 소음, 분진 등 환경 오염원을 유발시키며 특히 지형과 산림을 훼손한다 본고에서는 백두대간에 인접한 한라 석회석 광산을 모델로설정하고 연구하였다. 환경 오염원을 저감시키고, 원 지형 및 산림의 보존을 위하여 노천 채굴과 함께 갱내 채굴을 동시에 채택할 것을 제의한다. 갱내 채굴의 경우 중단 채굴법을 추천하며 이때 한 광획의 크기는 80(높이)$\times$70(너비)$\times$(100~120m)(연장)이며, 태수율은 약 42%로 예상된다. 환경오염 저감을 위한 대책도 제시하였다. 파쇄입도의 조정을 위하여 암반태 불연속면의 발달 상태를 고려하고, 장약공 밑부분과 중간부분의 장약밀도를 변경해야 한다. 환경오염 저감의 한 방안으로 차폐벽의 채택과 갱내 채굴시 출광 가능량 등을 검토하였다.

• 한국환경보건학회지
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• 제31권5호
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• pp.431-443
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• 2005

This study was performed to investigate the perceptions of the opinion leaders, such as government officials, researchers, NGO workers, and journalists on the risks of endocrine disrupters (EDs) and genetically modified organisms (GMOs) as well as the related policies on these two hazards or potential hazards. The opinion leaders generally considered the EDs as the most serious hazard among twenty-one environmental health hazards in Korea, and agreed that the EDs would continuously be the most serious hazard. On overall average, the GMOs were ranked the 11th among the twenty-one health hazards. Further investigation indicated that the GMOs were variously ranked by the group of respondents: they were ranked the 2nd by the NGO workers, the 7th by the journalists, the 9th by the researchers and the 11th by the government officials. In general, the respondents considered the dioxin as a hazard with the highest risk while the GMOs were considered less hazardous. The opinion leaders considered that although the risks of the GMOs and EDs were not fully verified, the risks should be controlled through the legislation. The EDs and GMOs should be separately regulated for the time being, while the EDs should put under more strengthened regulation. It is recommended that a web-site containing the information on the EDs and the GMOs be prepared for the journalists. In addition, a training program in relation to the EDs and the GMOs needs to be organized by the Korean Press Foundation and the Korea Food and Drug Administration to educate the journalists. A committee consisting of government officials, scientists, and NGO workers needs to be established, and it should provide framework of future policies and public relations programs.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.1083-1089
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• 2006

Acid drainage occurs when sulfide minerals are exposed to an oxidizing environment. The objective of this study was to examine the optimum condition for creating a phosphate coating on standard pyrite surfaces for reduction of pyrite oxidation. The solution of $10^{-2}M\;KH_2PO_4\;10^{-2}M\;H_2O_2$ pH 6 was identified as the best phosphate coating agent for the reduction of pyrite oxidation. The formation of an iron phosphate coating on pyrite surfaces was confirmed with ore microscope and scanning electron microscope equipped with energy dispersive spectroscopy. The temperature did not significantly affect on the formation of phosphate coating on the surface of pyrite. However, the phosphate coating was less stable at higher temperature than at lower temperature. The phosphate coating was quitely stable at wide range of pH and $H_2O_2$ concentration. The less than 3.4% of phosphate was dissolved at pH 2.79 and 10.64 and less than 1.0% of phosphate was dissolved at 0.1M $H_2O_2$. On the basis of these results, the phosphate coating can effectively reduce the negative environmental of acid rock drainage.

• 한국환경보건학회지
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• 제35권4호
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• pp.269-277
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• 2009

Objective : The objective of this study was to examine how experts and the public perceived various environmental and technological hazards based on psychometric paradigm. Methods : We conducted a survey that included 30 hazards and 10 risk attributes. Subjects of this study were 214 people with three groups; (1) experts (55 people), (2) graduates( 78 people), (3) under graduates (81 people). Factor analysis was used to confirm the common risk attribute from 8 risk attributes. Also, multiple regression analysis was used to identify factors influencing on perceived risk and benefit of hazards. Results : This study revealed that experts tend to be more tolerant than graduates and under graduate students for the 30 hazards. Using factor analysis, two main factors were identified: factor 1, commonly called "Dread Risk", and factors 2, commonly called, "Unknown Risk" in the literature. We identified that environmental hormone concentration and global warming ranked high in both dread risk and unknown risk. Multiple regression models were used to test the association of perceived social risk and perceived social benefit with two main factors. Dread risk had significant explanatory power on perceived social risk and benefit. We identified that the experts were less likely to perceived dread risk and know more information about the hazards. Conclusions : There were differences of risk perception between experts and lay people. Especially, experts' perception of risk was commonly lower than other people's perception.

• 한국산업보건학회지
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• 제25권3호
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• pp.285-293
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• 2015

Objectives: This study was conducted in order to ascertain the important factors for SMEs in managing the risks of chemicals and to suggest a government role in strengthening the responsibility of small and medium enterprises(SMEs) as employers. Methods: About 100 enterprises were surveyed in Incheon. A questionnaire for employers and walk-through surveys by occupational hygienists were performed at each enterprise. Results: The results showed that most employers thought chemicals were not hazardous but chemical management was needed. When employers determine how to manage chemicals, they rely heavily on personal experience and rather less on information from the government or experts. However, if employers think the chemicals are hazardous, they do more to manage the chemicals. Conclusions: When employers think chemicals are hazardous, risk assessment would be an effective tool to control chemical hazards in SMEs. Employers' position on chemical hazards is very important. Since the government is the initiator, it is the government who develops messages for SMEs, such as "Chemicals are hazardous and management can reduce the risk of chemicals." Governmental messages can play an invaluable role in strengthening the responsibility of SME employers to manage chemical hazards.

• Safety and Health at Work
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• 제15권3호
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• pp.284-291
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• 2024

Background: This study aimed to identify the prevalence of workplace hazards and organizational protection resources according to the size of the enterprise in the manufacturing industry of the Republic of Korea. Methods: We analyzed data of waged workers (weighted N = 5,879) from the Fifth Korean Working Conditions Survey (2017). Enterprise sizes were categorized as "micro enterprises" (less than five employees), "small enterprises" (5-49 employees) and "medium-large enterprises" (50 or more employees). Self-reported exposure to 18 physical, chemical, ergonomic, and psychological hazards were measured. The presence of organizational protection resources such as a labor union, a safety delegate working at the company, designated spaces to deal with safety, and the provision of health and safety information was evaluated. Results: Compared to workers in medium-large enterprises, those in micro enterprises showed a higher proportion of exposure to most of physical, chemical, ergonomic, and psychological hazards, except for exposure to solvents, prolonged sitting, and experiencing a state of emotional unrest. On the other hand, workers in micro enterprises had the lowest proportion of access to organizational protection resources. Conclusion: Our study demonstrates that manufacturing workers at the micro enterprise in the Republic of Korea are exposed to the most hazardous work environment and yet have access to the fewest organizational protection resources.

• 한국제4기학회지
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• 제17권2호
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• pp.167-168
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• 2003

The Upo wetland, the largest natural wetland in Korea, is located in Changnyeong-gun, Gyeongsannam Province ($35^{\circ}33'$ N, $128^{\circ}25'$ E), and 70 km upstream from the Nakdong River estuary. Unlike most other Korean wetlands that have been destroyed under the name of economic development, the Upo wetland has been able to preserve its precious ecosystem throughout the years. Thanks to increased public awareness about natural wetlands and environmental conservation, the Korean Ministry of Environment designated the Upo wetland an 'Ecological Conservation Area' on July 26th, 1997. On March 2nd of the following year, the Upo wetland (8.54 $\textrm{km}^2$) was designated a 'Protected Wetland' in accordance with the international Ramsar Treaty. A 4.49m long (from 9.73 to 5.24 m in altitude) UP-1 core ($35^{\circ}33'05"N$, $128^{\circ}25'17"E$), recovered in the marginal part of the Upo wetland, is divided into eight buried paleosol units of different ages on the basis of the abundance of color mottles and vertical color variations (Aslan et al., 1998). Radiocarbon datings suggested that the paleosol profile represent the last 5700 years. The entire section of the core was more or less subjected to pedogenetic processes, and shows very weak to moderate soil profile development. These Holocene paleosols are therefore regarded as synsedimentary soils of deluvium (deposits formed by floods) origin (Sycheva et al., 2003). Unit 1 to 5 paleosols are generally silt-rich and exhibit moderate profile development. The boundaries between the units are somewhat distinguishable, but not so clear cut. This is due to variable repeated combination of accumulation, denudation and soil forming processes within various periods. Mottle textures gradually decrease in abundance with increasing clay content in Unit 6, which results in weak profile development. The lower boundary of Unit 6 lies around about 2000 yrBP, the beginning of Subatlantic in Korea (Kim et al., 2001). Abrupt sediment textural change is detected in Unit 7, which is interpreted to indicate the human activities on the Upo wetland. Unit 8 represents the recent soil forming processes. The preliminary results of this ongoing study imply the primary factor for pedogenetic processes is the water table fluctuations related to the sedimentary textures like grain size distributions, and the geomorphological stability of the Upo wetland.o wetland.

• Environmental Analysis Health and Toxicology
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• 제23권4호
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• pp.247-256
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• 2008

Public perceptions of nanotechnology and its potential risk can be an important measure for the sustainable advances of the technology. We conducted a survey for public (N =599) and experts (N = 165). They answered the same questions and results were analyzed. 74% of the public have not heard about the potential risk of nanotechnology and 77% expected that nanotechnology/materials are not harmful to the human and nature. 74% of experts realized the potential hazards by nanomaterials. The results represented that large perception gab between public and experts has existed in Korea. Interestingly, Korean public thought that nanotechnology is more profitable and less risky than that of American. We suggest that 'now is the best time to give appropriate information on the potential risk of nanotechnology to Korean public without preconception or exaggeration.'

• 지질공학
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• 제17권1호
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• pp.75-87
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• 2007

자연사면에서의 산사태를 평가함에 있어 발생양상과 기하특성을 파악하는 것은 매우 중요하다. 이 연구는 지질을 달리하는 3개지역(장흥, 편마암류; 상주, 화강암류; 포항, 제3기 퇴적암류)에서 발생한 산사태를 대상으로 지질조건에 따른 산사태의 기하양상을 분석하였다. 3개지역에서는 1998년 여름에 $150{\sim}588mm$의 집중호우로 인해 총 1,582개의 산사태가 발생하였다. 이들 산사태를 조사하여 지질조건별 기하특성을 분석하였다. 산사태는 90% 이상의 사면고도에서 발생빈도가 가장 높고 70% 미만의 고도에서는 매우 낮다. 사면경사는 $26{\sim}30^{\circ}$ 범위에서 가장 많이 발생하였고 $20^{\circ}$ 미만에서는 발생빈도가 매우 낮으며 이러한 양상은 지질별로 거의 유사한 경향성을 보였다. 규모는 부피로 보아 수십부터 수백을 넘는 경우도 있으며, 그 길이는 $5{\sim}300m$, 폭은 $3{\sim}50m$로서 좁고 긴 형태이고 깊이는 대부분 1 m 이내로서 매우 얕은 특징을 보였다. 그리고 유형은 기반암의 표면을 파괴면으로 하여 그 상부에 위치한 토층이 미끄러지는 전이형 슬라이드가 주를 이루며, 토석류로 이뤄진 사태물질이 하부사면과 계곡부로 이동되면서 유동성산사태로 변화되는 양상을 보였다.

• 한국지반공학회논문집
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• 제21권5호
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• pp.83-92
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• 2005

산성암반배수가 발생되는 지역을 중심으로 사면구조물의 피해현황과 환경오염 실태를 파악한 결과를 하면 다음과 같다. 첫째, 산성암반배수가 발생하는 절취사면은 대부분 숏크리트공법으로 처리하고 있으며, 산성암반배수가 사면구조물의 안정성에 악영향을 미치고 있다. 둘째, 숏크리트는 산성암반배수에 의해서 현저하게 열화되어 가고 있으며, 용수발생량이 많은 곳은 배면공동이 발견되는 경우도 있다. 셋째, 절취사면에서 산성암반배수가 발생되는 곳은 국부적으로 불안정하고, 이를 보강하기 위하여 앵커와 록볼트를 사용하고 있으나 강산성암반배수에 의해 부식될 우려가 크다. 넷째, 식생공의 경우 산성암반배수가 잔디 씨앗의 발아 및 성장에 악영향을 미치고 있어 일부 지역에서는 생석회를 사용하여 산성암반배수를 중화시키고 있으나 근본적인 대책은 되지 못하고 있다. 다섯째, 황철석의 풍화로 발생한 산에 의해 배수가 낮은 pH를 유지하면서 중금속들을 용출시켜 지속적으로 배출하여 부근 토양, 지하수와 하천수를 오염시킬 개연성이 매우 크다. 산성암반배수의 발생 가능성을 암석유형별로 평가한 결과 편마암, 화강암의 경우 산성배수 발생 가능성이 낮은 군으루 열수변질을 받근 화산암, 응회암, 탄질셰일, 금속광산 폐석시료는 산성배수 발생 가능성이 높은 군으로 분류되었다. 따라서 토목건설공사과정에서 빈번히 발생될 것으로 예상되는 사면절취에 의한 암반산성배수에 대비하여 발생개연성이 있는 지역에 대한 지반정보의 확보 및 대책기술의 개발이 요구되고있다.