• 사물인터넷융복합논문지
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• 제4권1호
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• pp.37-41
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• 2018

본 논문은 도로에서 발생하는 2차 사고를 예방하기 위한 스마트 안전 삼각대를 연구한다. 도로에서 교통사고 후, 사고를 알리기 위해 안전 삼각대를 설치해야 된다. 그러나 안전 삼각대 설치 중 2차 사고를 유발할 수 있다. 이러한 문제를 해결하기 위해 스마트 안전 삼각대를 제안하고 구현하였다. 스마트 안전 삼각대는 충격을 감지하면 로고 라이트을 통해 삼각대의 역할을 수행한다. 아두이노를 이용하여 충격 감지, 로고 라이트 기능을 수행한다. 제안된 스마트 안전 삼각대는 조명의 밝기 등이 보완되면 안전 삼각대로의 역할을 수행하여 2차 사고 예방에 도움이 될 것으로 기대한다.

• Wind and Structures
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• 제15권4호
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• pp.345-354
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• 2012

This work discusses the wind stability requirements specified by UN Reg. 27 on emergency car warning triangles, which are of mandatory use in many countries. Wind tunnel experiments have been carried out in order to determine aerodynamic coefficients of commercial warning triangles and the friction coefficients between the triangle legs and an asphalt base that fulfils the roughness requirements stated by Reg. 27 for wind stability certification. The wind stability specifications for warning triangles are reviewed, compared with pressure field measurements and discussed. Results of wind tunnel tests and comparison with field measurements reported in the literature show that the requirements could be excessively conservative.

• 한국환경농학회지
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• 제26권3호
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• pp.204-209
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• 2007

Agricultural area in the vicinity of the ${\triangle}{\triangle}$ smelting factory in Kyeongbuk province, the third largest zinc smelting factory in the world, was contaminated by high concentration of heavy metals. However, the heavy metals source was not yet directly traced and thus, resulted to a conflict between the factory and residents within its vicinity. In order to determine the level of heavy metal contamination in the arable lands located at the north eastern part of the factory, soils were sampled systematically. To find out the major reason for the occurrence of this problem, waters and aerosols were sampled with constant intervals to the upward and downward direction from the factory and were analyzed to find out the heavy metal concentrations. Cadmium (Cd) and zinc (Zn) of the heavy metals were highly accumulated more than the Korean warning criteria (Cd 1.5, Zn 300 mg $kg^{-1}$) with mean values 1.7 and 407 mg $kg^{-1}$, respectively, at the surface soils (0-20 cm), and heavy metal concentration significantly decreased with increasing soil depth In addition, the concentration of both metals slightly decreased with increasing distance from the factory to the surface soils. Cadmium and Zn were detected in the upward stream water with low concentration and concentrations increased significantly in the downstream after passing across the factory. Aerosol samples also showed traces of Cd and Zn which could be attributed to the contamination of the water system and the surface soils. Conclusively, Cd and Zn emitted from the ${\triangle}{\triangle}$ smelting factory moved with the aerosol in the atmosphere and thus, contaminated the agricultural areas and the water system within it vicinity.

• International Journal of Contents
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• 제13권2호
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• pp.50-56
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• 2017

The number of accidents in school zone is decreasing than before with the introduction of strengthening traffic safety policy since January 2011, but the danger still exists. The School zone sign is widely known to have much effect in protecting children from risks of traffic accidents, but design improvement is being demanded to improve a sense of safety and legibility of safety signs in School zone due to the lack of understanding on the safety signs in crosswalk and School zone. This study analyzed differences in shape and color of existing safety signs through a case analysis of traffic developed countries as America, England, Japan, and Germany and suggested improvement plans for drivers to clearly perceive the school zone. For improvement methods, this study suggested the importance of delivering definite and unified warning message for school zone to drivers by using indication sign and caution sign together, and to use yellow, a safety color, and to unify the safety sign into triangle shape that symbolizes warning and caution to conform the international standards. Actual design production and experiment through improvement plans are needed in the future, and it is expected to secure safety of children and to provide international standardization of safety signs in school zone.

• 한국환경농학회지
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• 제26권3호
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• pp.210-216
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• 2007

The cadmium (Cd) and zinc (Zn) contamination of soils and cultivated crop plants by zinc smelting activities was studied. In the study area of the vicinity of ${\triangle}{\triangle}$ zinc smelting factory in Korea, soils and corn plants were sampled at corn harvesting stage and analyzed Cd and Zn concentration as well as Cd and Zn fraction and chemical properties in soils. At 600 m radius of studied area, Cd and Zn were highly accumulated in the surface soils (0 - 20 cm) showed greater than the Korean warning criteria (Cd 1.5, Zn 300 mg $kg^{-1}$) with corresponding values 1.7 and 407 mg $kg^{-1}$, respectively. The leaf part gave higher Cd concentration with the corresponding value of 9.5 mg $kg^{-1}$ as compared to the stem and grains pare (1.6 and 0.18 mg $kg^{-1}$), respectively. Higher Zn concentration was also obtained from the leaf part of the corn plant which gave the value of 1,733 mg $kg^{-1}$. The stem and grain part gave corresponding values of 547 and 61 mg $kg^{-1}$. The order of the mean Cd concentration in fractions is F3 (oxidizable fraction) > F2 (reducible fraction) > F4 (residual fraction) > F1 (exchangeable + acidic fraction). A highly positive correlation is observed between F2 and concentration of Cd and Zn in both plant pare, leaf and grain. Highly positive correlations are shown in the pH exchangeable Ca and Mg, and CEC when correlated with Cd and Zn bound to F4 fractions. To reduce Cd and Zn uptake by corn plant in an arable land heavily contaminated with Cd and Zn as affected by smelting factory, an efficient and effective soil management to increase soil pH and CEC is thus recommended.

• 식물병연구
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• 제24권3호
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• pp.182-192
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• 2018

화상병은 우리나라에서 그동안 존재하지 않았던 금지병으로서 2015년 최초로 발병한 후 아직 박멸되지 않아, 국내 확산 연구가 필요하다. 병 삼각형 원리를 바탕으로 화상병 발병에 적합한 환경 요인을 추론하기 위해서, 최근 4년(2014-2017년) 우리나라 기상관측 자료 및 미래(2020-2100년) 기후변화 시나리오 RCP8.5 예측 기상자료를 입력하여 화상병 발병 예측프로그램인 MARYBLYT로 꽃감염을 예측하였다. 이 예측 프로그램은 신고배 개화기간을 먼저 계산한 후, 개화기간 중 매일매일의 화상병 꽃감염 위험 경보를 출력하였다. 최근 4년 동안 꽃감염 결과 화상병 발생지인 경기 안성과 천안뿐만 아니라 인근 주산지인 평택, 아산 모두 2014년과 2015년에 "Infection" 경보가 나타났다. 또한 배 주산지인 전남 나주는 2016-2017년 "Infection" 경보가 나타났다. 최근 4년간 방제 권고 수준인 "Infection" 또는 "High" 경보 발령은 우리나라 전체 중 80% 지역에서 나타나 우리나라는 화상병 발병에 적합한 환경이었다. 80년간 미래 기후변화 기상자료로 개화기간 동안 화상병 꽃감염을 예측한 결과 해마다 감염위험 지역이 급변하였다. 하루 이상 "Infection" 경보가 발령되는 지역이 전국의 50%가 넘을 정도로 광범위할 것으로 예측되는 해는 총 20년이었던 반면 "Infection" 경보가 전국의 10% 미만 지역일 것으로 예측된 해는 8년이었다. 이들 두 그룹의 환경요인 비교분석 결과, 개화기간 중 평균온도와 누적 강수량이 유의하게 달랐다. 본 연구 결과는 외래 침입균인 화상병 관리를 담당하는 정책 당국에 적절한 정보를 제공할 것이다.