송전철탑의 심형기초 시공 시 안전확보가 매우 중요한데, 무거운 철근을 취급하는 작업자의 중대 재 해 위험이 크고 실제로 심형기초를 위한 철근공 작업자들의 사고가 끊이질 않는 실정이다. GFRP는 철근 이상의 인장강도를 갖도록 제작이 가능하고, 철근에 비해 무게가 가벼워 취급이 용이하며 시공 편이성이 높다는 장점이 있다. 따라서 본 연구에서는 철근을 대체하여 GFRP를 보강근으로 활용한 심 형 기초의 구조설계에 대해 다루었다. 국내 송전철탑 설계기준(가공송전선용 철탑기초 설계기준, DS-1110, 한국전력) 및 ACI440.1R-06 설계기준을 참고하여 GFRP 보강근이 적용된 심형 기초의 구 조검토를 수행하여 GFRP 보강근의 적용성을 검토하였다. 송전철탑의 심형 기초 단면에는 휨모멘트와 축력이 동시에 작용하며 심형기초의 주체부 및 구체부 특성에 따라 축력에 의한 편심모멘트가 추가로 작용한다. 이에 따라 설계 검토는 휨 및 축력이 동시에 작용하는 경우에 대해 수행되었다. 국내 기준 (DS-1110)의 구조검토는 허용응력설계법의 형식을 취하므로 축력과 휨모멘트에 의한 최대응력을 산 정하여 허용응력과 비교하였고, 강도설계법을 통한 구조검토는 보강된 단면의 P-M 상관도를 작도하 여 휨모멘트 및 축력이 동시에 작용하는 경우 구조 안전성 확보 유무를 판단하여 GFRP 보강재를 배 근한 단면의 설계적정성을 판단하였다.

본 연구는 헤이워드 다래나무의 비정상 생장 관련 문제점을 파악하고자, 건전 개체와 비건전 개체 간의 물리·해부학적 특성 및 Calcium Oxalate 형성 특성을 비교분석 하였다. 두 집단 간 밀도와 함수율 등의 물리적 요인과 연륜폭, 도관직경, 도관비율, 방사조직 높이와 너비 등의 해부학적 특성 요인을 비교분석해 본 결과 모든 요인에서 유의적인 차이가 나타났다. 특히 Calcium oxalate 결정은 주로 수피 부분에 여러 개가 다발형태로 다수가 존재하였으나, 도관 주위에서는 출현율이 낮았고, Pith와 목질부에서는 거의 나타나지 않았다. 이러한 Calcium oxalate 결정체는 건전개체(9.0 ×106/g개) 보다 고사가 진행 중인 비건전개체(10.4×106/g)에서 유의적으로 출현빈도가 높게 나타났음을 알 수 있었다.

A baggage handling system (BHS) in airport is an unified system for moving the passengers’ baggage in designated time. Input baggage from the check-in counter travels to the baggage claim area or cargo handling terminal through this system. In particular, entryway BHS consists of conveyors, X-ray and sorters such as tilt-tray to send the baggage to departing airplane and it could have various problems for handling certain amount of baggage in restricted time such as baggage jamming at certain merge point. This causes systemic error such as delay of the time, omissions of the baggage and even breakdown of the equipment and inefficiency. Also the increasing maximum time of the baggage passing through the BHS could delay the flight schedule and finally decrease the service level. Thus, the algorithm for controlling the flow of the merge is essential to the system. The window reservation algorithm is the one of the most frequently used methods to control the merge configuration. Above all, the reserve location, so called reserve ahead point, that allocates the window is important for the performance of the algorithm. We propose the modified window reservation algorithm and the best reserve locations by changing the reserve ahead point in the induction conveyors. The effect of various reserve ahead points such as the capacity and utility of the system were analyzed and the most effective reserve ahead point combination was found. The total baggage processing time and the utilization of the tilt-tray are properly considered when choosing the optimal Reserve ahead point combination. In the layout of this study, the configuration of four conveyors merged into one tilt-tray is studied and simulation analysis is done by AutoMod®, 3D simulation software. Through the simulation, the window reservation algorithm is effectively operated with the best combination of reserve ahead point which reduces the maximum baggage travel time.

Developing proper reduction strategies of indoor radon which have been an important issue in Korea requires proper information on source characteristics a phosphate gypsum board which is a common building material used for inter-wall thermal protection in Korea could be a major source of indoor radon level. This study evaluated the correlation between indoor radon concentration and the attribution of gypsum board content in building materials. In this study we valuated indoor/outdoor radon from 58 facilities selected based on the information availability of gypsum content in the building material across 8 different cities in Korea. Our results showed that indoor radon concentrations were 2 to 3 times higher than outdoor but those results were not significantly attributed from gypsum contents in the building material. Indeed, phosphate content in gypsum board did not significantly play a role in indoor radon level variations. It is concluded that physical environmental condition such as temperature, relative humidity, radon exhalation rate out of each building materials, as well as pathway from external sources (e.g., soil) needs to be identified to develop indoor radon reduction strategies.

The objective of this study is to offer basic scientific data to support policy decision-making for the improved control of nitrogen dioxide(NO₂) and nitrous acid(HONO) in residence. The survey on concentration of NO₂and HONO in 20 houses in Seoul and Daegu was performed from January to February, 2013. Average NO₂concentrations in the kitchen, living room, and room were 25.7 ± 7.7 ppb, 24.3 ± 8.5 ppb, and 19.6 ± 5.6 ppb, respectively. Also, average HONO concentration were 3.6 ± 1.0 ppb, 3.1 ± 0.9 ppb, and 3.1 ± 0.9 ppb, respectively. NO₂and HONO concentration in kitchen were significantly higher than the concentration in the living room and room(p<0.05). Concentration ratios of HONO/NO2 were ranged to 0.070 0.277 for indoor air and 0.004 0.161 for outdoor air. Indoor HONO/NO2 ratios were higher than the outdoor HONO/NO₂ratios.

Two pesticides commonly used in spinach were subjected to a field residue trial to ensure safety of terminal residues in the harvest. The residual patterns of two pesticides, which were Azoxystrobin and chlorpyrifos were examined after applying with the recommended dose and their DT50 were calculated. Also degradation patterns of pesticides at storage 4℃ were compared to those at 20℃, and removal rates of pesticides by washing spinach with water were measured. Biological half-lives of azoxystrobin and chlorpyrifos were 3.2~3.8 and 3.8~4.7 days, respectively. During the storage period, the degradation patterns were appeared more obviously at 20℃ than 4℃. Removal rates of azoxystrobin and chlorpyrifos were 9.6~90.0% and 17.7~85.8% by various washing methods.

경제성장의 핵심요소인 기업의 기술혁신 활동을 지원하기 위해서 정부는 다양한 지원제도를 운용하고 있다. 이와 관련하여 선행연구들은 기술혁신의 결정요인, 지원정책수단의 효과 등에 대해 다양한 분석결과를 공급자적 관점에서 제시하고 있지만 정책수요자 측면에서의 특성에 관한 연구는 전무한 실정이다. 이에 본 연구에서는 과학기술정책연구원(STEPI)에서 실시한 기술혁신조사(2005) 자료를 활용하여 기술혁신 장애요인과 지원제도 활용간의 영향관계를 로지스틱 회귀분석(Logistic Regression Analysis)을 통해 살펴보았다. 분석결과 지원제도의 유형에 따른 일부 차이에도 불구하고 기술혁신 장애요인이 지원제도 활용에 유의미하게 영향을 미치는 변수임을 확인할 수 있었다. 자금 장애요인이 클수록 기업들은 유형을 불문하고 지원제도를 보다 적극적으로 활용하는 것으로 나타났다. 또한 협력 장애요인을 크게 경험하는 기업일수록 기술지도/정보제공 관련 지원제도를 활용할 확률이 높았다.

Three benzimidazole pesticides commonly used in korean lettuce were subjected to a field residue trial to ensure safety of terminal residue in the harvest. The residual patterns of three benzimidazole pesticides, which were carbendazim, benomyl and thiophanate-methyl were examined after applying with the recommended dose in two types of korean lettuce (Chima and Chuckmeon) and their DT50 were calculated. In Chima lettuce, biological half-lives of carbendazim, benomyl and thiophanate-methyl were 2.56, 1.37 and 2.54 days, respectively and their required time under MRL(5.0 mg/kg as carbendazim) were 4.5, 2.2 and 1.0days. In Chuckmeon lettuce, biological half-lives of them were 3.41, 1.70 and 4.20 days, respectively and their required time under MRL were 5.4, 1.9 and 0.5days.