• Korean Journal of Environmental Agriculture
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• v.17 no.3
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• pp.205-210
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• 1998

This study was carried out for the dietary safety based on the level of pesticide residues in 19 kinds of agricultural products consumed in Kangwon-do, Korea. From April 1995 to December 1997, eight organochlorine pesticides in 673 samples were analyzed by using GLC-ECD. According to the results, one kind of pesticides were detected in 159(23.6%) samples and two kinds were in 24(15.1%). While Chlorobenzilate, Dicofol and Tetradifon were not found. Detection ranges of pesticides were $0.001{\sim}0.117ppm$ for DDT, $0.001{\sim}0.095ppm$ for ${\gamma}-BHC$, $0.001{\sim}0.067ppm$ for ${\alpha},{\beta}-Endosulfan$, $0.003{\sim}0.250ppm$ for Chlorothalonil and 0.033ppm for Captafol. Average residues were 0.006ppm for DDT, 0.009ppm for ${\gamma}-BHC$, 0.008ppm for ${\alpha},{\beta}-Endosulfan$, 0.024ppm for Chlorothalonil and 0.033ppm for Captafol, respectively. Consequently, all of the organochlorine pesticide residues in the analyzed samples were within the maximum residue limits.

• The Journal of Engineering Geology
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• v.28 no.2
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• pp.183-192
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• 2018

It is imperative to inject carbon dioxide($CO_2$) into an aquifer for alleviating the emission of $CO_2$. However, faults in the aquifer can be reactivated due to pressure increasement. Analyses of pressure change of the aquifer is necessary to prevent the fault reactivation. In this research, we assess the stability of an aquifer in Pohang Yeongil bay by investigating the pressure variation of faults EF1 and EF2. Two scenarios, which repeat $CO_2$ injection and suspension during two years, are simulated. Each scenario includes cases of injection rates of 20, 40, and 100 tons/day. In addition, we analyze planned and predicted injection rates for each case. In case of 20 tons/day, the maximum pressure of faults is 65% of the reactivation pressure. Even if daily injection rates are increased to 40 and 100 tons/day, the maximum pressures are 71% and 80% of the reactivation pressures, respectively. For 20 and 40 tons/day cases, planned injection rates almost accord with predicted injection rates during whole simulation period. On the other hand, predicted injection rates are smaller than planned injection rates for the 100 tons/day case due to bottom-hole pressure limit of the injection well.

• The Korean Journal of Pesticide Science
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• v.12 no.4
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• pp.357-362
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• 2008

In order to survey the residual characteristics of pesticides and assess their safeties in the agricultural products from markets, the agricultural products were purchased from the wholesale and traditional markets in Cheongju and Jeonju and analyzed the pesticide residues in them. No pesticide residues were found in samples from Cheongju, whereas, in case of samples collected from Jeonju, 3 pesticides including chlorothalonil were detected from 5 samples such as eggplant from wholesale market and 3 pesticides including azoxystrobin were found in tomato and grape from traditional market. Pesticide residues were detected from 10.9% of the total samples and detection levels were less than their maximum residue levels. Their estimated daily intakes ranged from 0.00102 to 0.03616% of their acceptable daily intakes, representing residue levels of the pesticides detected were evaluated to be safe.

• Journal of Astronomy and Space Sciences
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• v.21 no.4
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• pp.361-370
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• 2004

The DSN(Deep Space Network) measurement model for interplanetary navigations which is essential for precise orbit determination has been developed. The DSN measurement model produces fictitious DSN observables such as range, doppler and angular data, containing the potential observational errors in geometric data obtained from orbit propagator. So the important part of this research is to model observational errors in DSN observation and to characterize the errors. The modeled observational errors include the range delay effect caused by troposphere, ionosphere, antenna offset, and angular refraction effect caused by troposphere. Non-modeled errors are justified as the parameters. All of these results from developed models show about $10\%$ errors compared to the JPL's reference results, that are within acceptable error range.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.2
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• pp.8-15
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• 2006

To reduce costs and address other practical concern related to architectural lighting, we have been involved in various aspects of advanced daylighting design and control. If we look toward future building trends, we see that the advanced has already successfully deployed such complex lighting control systems. This paper takes a broad view of what advanced manufacturers have done to develop energy efficient lighting control technologies such as sensors, lumen maintenance, time of day scheduling, peak demand reduction and so forth. First of all strategies, daylighting controls would also need to be commissioned to respond to the specific daylighting signature of the zone. To translate the daylight in term of the amount of energy savings, an electric lighting system is designed and automatic on-off control system integrated with the contribution of daylighting has been applied to the operating of the artificial lighting. The lighting analysis program, Lumen-Micro predicts the optimal layout of conventional fluorescent and incandescent lighting fixtures to meet the designed lighting level and calculates unit power density, which translates the demanded amount of lighting energy.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.6
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• pp.21-28
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• 2017

Electro-hydraulic sliding deck systems have been developed to reduce the weight for the loading of an agricultural machine. The extension length of the sliding deck was calculated according to the bed's dump angle. The optimum thickness and material were determined using a large and heavy load at acceptable angles. In addition, the degrees of freedom were calculated to obtain the input/output relationship of the system. An equation was derived using a simplified model formula for the extended length of the sliding deck according to the bed's dump angle. Also, the advance length at the maximum and minimum angles of the system was determined using numerical analysis. A down-scaled model of the system was constructed and verified by experiments. The deck was simplified to determine the material and thickness of the sliding deck and for the selection of the two representative materials. The simplified model was tested in deformation tests and stress tests with different thicknesses and materials using a structure analysis program. The analysis results show that ATOS80 is the best among the two materials for reducing the weight of the system.

• The Journal of the Korean life insurance medical association
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• v.25
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• pp.49-62
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• 2006

생명공학의 시대로 일컬어 지고 있는 오늘날, 재생의학 분야에서는 난치성 질환 치료를 목적으로 활발한 연구가 진행되고 있다. 특히, 줄기세포를 이용한 세포 대체치료 관련 연구는 최근 국내 황우석 박사의 체세포 핵이식 배아세포주 확립에 이르기 까지 괄목할 만한 발전을 보여 주고 있다. 이와 관련해 생명보험산업에 적잖은 파장이 예상되며, 생명보험사 내부적으로 기존에 판매된 상품의 사차손 관리와 함께 급속도로 발전하는 줄기세포 연구에 직접적으로 대응하는 상품개발, 언더라이팅, 지급 심사 등 보험사 내외에서의 전방위적인 변화가 필요하다는 문제 제기가 있다. 줄기세포란 조직 분화 과정에서 볼 수 있는 세포이며 근육 뼈 뇌 피부 등 신체의 어떤 기관으로도 전환할 수 있는 만능세포로서, 간 폐 심장 등 구체적 장기를 형성하기 이전에 분화를 멈출 배아 단계의 세포를 말한다. 한편, 성체줄기세포는 조직이나 기관의 분화된 세포들 사이에서 발견되는 미분화 세포로써, 자기 스스로 증식할 수 있으며, 조직이나 기관의 특수한 기능을 가지고 있는 세포로 분화할 수 있는 능력을 가진 신체줄기세포를 말한다. 배아줄기세포와 생체줄기세포를 통한 장기이식 등 난치병 정복은 윤리적, 사회적으로 많은 논란이 예상되며, 기술적으로도 해결해야 할 문제점들이 산적해 있기 때문에 아직은 요원한 것이 사실이다. 현재 유럽 대부분의 나라와 미국에서는 인간 배아의 복제가 금지되어 있으며, 일본 정부는 연구용 배아 복제를 제한적으로 허용하고 있다. 하지만, 우리 나라의 경우 2005년 1월에 '생명윤리 및 안전에 관한 법'이 발효되었지만 정부는 관련 부작용에 대한 깊은 고찰 없이 전폭적인 지원들 약속하고 있는 실정이다. 줄기세포 연구의 발달로 인해 인류가 난치병 치료의 첫 장을 열었다고 하더라도 그 영향이 당장 보험사에 미친다고 할 수는 없다. 왜냐하면 앞으로 이러한 신기술이 실제 의료행위에 적용되기 위해서는 여러 단계의 안정화 작업과 임상시험이 필요한데 이러한 작업이 기술적으로 어렵고 그 시간도 만만치 않게 걸리기 때문이다. 또한, 보험사의 보장은 크게 사망/수술/입원/암/기타보장으로 구별할 수 있는데, 줄기세포 연구의 발달과 관련이 있는 보장이 제한되어 있어 보험사에 미치는 영향이 당장 우려할 만한 수준이라 할 수 없다. 하지만 만약 치료용 줄기세포 배양으로 인한 장기 기관의 이식이나 손상세포의 대체 등과 같은 의학신기술의 예상 외로 급격하게 발전한다면 보험사의 Risk 관리에 상당한 저해요인으로 작용할 것으로 판단된다. 특히 진단 입원 수술로 대표되는 생존보장에 대한 사차 Risk 및 사차손의 급증이나 역선택 증가는 보험사의 경영수지 악화를 유발하여 보험산업 전반에 위험으로 작용할 수도 있다. 따라서, 장기적인 안목으로 업계 공동의 대응이 필요하고, 각 사에서도 상품개발, 언더라이팅, 지급심사 간의 긴밀한 협조가 요구된다. 생명보험산업의 Risk 관리는 기존의 시장환경에 영향을 받는 비차, 이차중심에서 보험회사가 어느 정도 관리를 통해 적정규모를 유지할 수 있는 사차로 그 중심축이 이동하고 있다. 보험산업이 계속 활력을 갖고 성장하기 위해서는 체계적인 Risk나 관리가 핵심일 것이며, 보험사의 사차 Risk의 중요성이 더욱 커져 가고 있는 현실에서 거시적으로 의학신기술 발달 등 위험요인에 대해 미리 분석하고 이에 대한 대비책 마련이 필요할 것으로 판단된다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.26 no.6
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• pp.723-731
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• 2020

The design of offshore plants should reflect the various requirements of the owner and the classification society. For a topside module mounted on an of shore structure, the design process is very demanding because of the large spatial constraints and the many requirements related to marine environmental conditions and safety such as the movement of the structure. In this study, the load acting on the hydraulic power unit, which is one of the main equipment in the topside module, was calculated according to the DNVGL rule; the structural safety was evaluated according to each load condition and the structural reliability of the developed product was improved. For structural analysis, MSC software was used, and structural analysis was performed under five load conditions to review structural safety for various movements. The results show that the maximum stress occurred during pitching toward the stern (Load Case 5). The stress level was approximately 85 % of the allowable stress, and the maximum deformation was approximately 5 % of the allowable value. The structural safety was confirmed, and no intermember interference occurred.

• Journal of Korean Society of Environmental Engineers
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• v.38 no.5
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• pp.269-278
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• 2016

In order to improve air quality in the Seoul Metropolitan Area (SMA), the "Special Act on Seoul Metropolitan Air Quality Improvement" has been enforced since 2005. The strategy has resulted in some reduction of air pollution, but there has not been much research into the quantitative impact analysis of each separate preventive countermeasure. Therefore, we analyzed nitrogen oxide reduction resulting from implementation of the emission control plan for on-road mobile sources. The MM5-SMOKE-CMAQ model system was employed for air quality prediction. Reduced $NO_x$ emissions for SMA was 16,561 ton, 4.7% of reduction rate, in 2007. One countermeasure, tighter acceptable standards for manufacturing vehicles, dominated other countermeasures for effective $NO_x$ emission control. Large spatial differences in reduced emissions, those for Seoul being twice that of Incheon and Gyeonggi, showed greater $NO_x$ emission reduction impact in the heart of the metropolitan complex. The $NO_2$ concentration decreased by 0.60 ppb (2.0%), 0.18 ppb (1.5%), and 0.22 ppb (1.7%) in Seoul, Incheon, and Gyeonggi, respectively. Concentration decreases in spring and winter were larger, 1.5~2.0 times, than summer and fall. However, the $NO_2$ reduction impact did not correspond directly to local $NO_x$ emission controls in the city area because of the natural flow and dispersion, both urban and downwind.

• Analytical Science and Technology
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• v.26 no.2
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• pp.142-153
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• 2013

A new, rapid, and simple analytical method was developed and validated using high performance liquid chromatograph-photodiode array detector (HPLC-PAD) for the determination of lepimectin residues in agricultural commodities. The lepimectin residues in samples were extracted with methanol, partitioned with dichloromethane, and then purified with glass column filled with subsequently to aminopropyl ($NH_2$) solid phase extraction (SPE) cartridge. The purified samples were detected using HPLC-PAD. Correlation coefficient ($R^2$) of both lepimectin $A_3$ and $A_4$ solutions were 0.9999. The method was validated using cucumber spiked with lepimectin at 0.02 and 0.2 mg/kg and pepper, mandarin, hulled rice, potato, soybean at 0.02 and 0.5 mg/kg. Average recoveries were 76.0~114.8% with relative standard deviation less than 10%, and limit of detection (LOD) and limit of quantification (LOQ) were 0.005 and 0.01 mg/kg, respectively. The result of recoveries and overall coefficient of variation of a laboratory results in Gwangju regional KFDA and Daejeon regional KFDA was followed with Codex guideline (CAC/GL 40). Therefore, developed method in this study is accurate, rapid, and appropriate for lepimectin determination and will be used to keep safety of lepimectin residues in agricultural products.