본 연구에서는 저온 스트레스에서 살리실산(SA, salicylic acid)의 경엽처리가 배추의 광합성, 생리활성 및 생육에 미치는 영향을 구명하고자 하였다. SA을 각각 0.25, 0.5 및 1mM 농도로 주당 100mL을 4일 간격으로 3회 엽면 살포하였고, 7일간 저온 스트레스를 처리하였다. SA 처리 시 광합성 속도, 기공전도도, 세포 내 CO2 농도 및 증산 속도는 무처리 대비 증 가하였고, 2회 처리 후 가장 높았다. MDA 함량은 무처리 대 비 유의한 차이를 보이며 감소하였다. APX, CAT, POD 및 SOD 활성은 무처리 대비 현저하게 증가하였으며, 각각 최대 62, 81, 55 및 26% 증가하였다. 배추의 생육 특성은 무처리와 유의한 차이를 보이지 않았으나, 수량 지수는 2－6% 정도 증 가하였다. 따라서 SA의 경엽처리는 배추의 생육, 광합성 특성 및 항산화 효소 활성을 증대시켜 저온 스트레스를 완화 하였 고, 적정농도는 0.5－1mM이라 판단된다.

Cold-pressed rapeseed oil (CPRO) is a rich source of bioactive components, but it is more susceptible to deterioration due to absence of chemical refining. Proper storage conditions are essential to maintain oil quality. This study evaluated the quality properties of seed-stored oil (SSO) and oil-stored oil (OSO) under various storage conditions. Both the seeds and the CPRO obtained from the ‘Jungmo7001’ and ‘Yuryeo’ varieties were stored for 24 months at 4℃, 25℃, and ambient temperature (AT). After 24 months, the acid value (AV) at 4℃ was lower than at 25℃ and AT. Additionally, the AV increased by 3.0-fold in SSO and 1.9-fold in OSO at AT compared to initial storage levels. OSO was found to be relatively more stable against oxidation than SSO. The canolol content in SSO increased with both storage temperature and period, but this was not observed in OSO. However, no changes in fatty acid composition or tocopherol content were noted based on the storage conditions, indicating that these properties remained relatively stable during storage. These results provide foundational data for the stable distribution of CPRO.

Liquid hydrogen, a promising energy carrier, necessitates robust storage and transportation systems due to its extremely low boiling point. Consequently, the development of reliable cryogenic adhesives and standardized testing protocols is crucial. This study focused on optimizing the design of a gripper used in single lap shear tests for evaluating cryogenic adhesives, specifically targeting the challenges posed by low-temperature conditions that induce slippage at the gripper interface. The optimal design was performed using a total of five variables, including the position and size of the gripper. By employing the genetic algorithm coupled with finite element analysis, we exhaustively searched through over 1000 models to identify the optimal gripper geometry. We successfully minimized stress concentration at the gripper region while maintaining a uniform stress distribution on the non-bonded surface. Furthermore, the study explored the impact of symmetric versus asymmetric gripper configurations on test results. The findings revealed that symmetric grippers generally yielded more consistent and reliable data. This study's results enable the accurate and stable execution of lap shear tests under the temperature conditions of liquefied hydrogen.

Perovskite-based solar cells have recently exhibited rapid improvement in power conversion efficiency due to their high optical and electrical properties. However, perovskite materials are fundamentally degraded by heat and moisture, making long-term stability a critical issue. One way to improve the stability of perovskite solar cells is to encapsulate them. However, a low temperature encapsulation process of less than 100 °C is needed to minimize degrading the perovskite materials. High moisture barrier properties are also required. To realize a high performance encapsulation layer at low temperature we employed atomic layer deposition (ALD) technique. As the encapsulation layer materials, Al2O3, which is most commonly used due to its high density and optical properties, and SnO2, which is mainly used as an electron transport layer in perovskite solar cells, were selected. Single film and multi-layer structured films of Al2O3 and SnO2 were deposited, and the structural, optical, and moisture permeability properties were investigated.

일반 가열 아스팔트 혼합물 생산 시 높은 온도로 이산화탄소 및 대기오염물질이 발생함으로써, 유럽 및 선진국들은 탄소배출 저감 이 가능한 중온 아스팔트(warm mix asphalt, WMA)를 사용하는 추세이다. 아스팔트 콘크리트의 생산온도를 낮출수록 이산화탄소 발생 량과 연료 소비량을 저감시킬 수 있어 중온 아스팔트 콘크리트에 대한 수요성은 증가하고 있으나 국내외로 중온 아스팔트 콘크리트의 생산온도는 120℃의 한계성을 극복하지 못하고 있는 실정으로 120℃ 이하의 생산기술을 확보하기 위해서는 기능성 개질재 제조기술 개발이 필요하다. 본 연구에서는 110±10℃의 생산온도에서 저온화 고분자형 개질재를 첨가하여 폴리머 개질 저온 아스팔트(Polymer Cool Mix Asphalt, PCMA)를 생산하였으며, PCMA 혼합물의 마샬안정도, 공극률, 동적안정도 및 인장강도비 등을 시험 평가하여 10년 이상의 공용 내구연한 확보를 확인하였다. 또한, 일반 가열 아스팔트 혼합물, 타사 중온화 첨가제를 적용한 아스팔트 혼합물 및 PCMA 혼합물의 비교평가를 실시하였으며 PCMA 혼합물의 피로균열지수(Cracking Tolerance Index) 및 노화계수(Aging Coefficient)가 비교적 매우 우수한 것으로 나타났다. 2024년 8월, 베트남 바리어붕따우성에서 PCMA 혼합물 생산 및 시공을 실시한 결과, 목표 생산온도인 110±10℃의 조건을 확보하였으며, 현장 포설시에도 특이사항 없이 시공이 완료되었다.

본 연구는 작약의 품종간 개화시기 차이와 저온에서 장기 저 장이 가능한 품종을 선발하여 절화 유통 기간을 연장하기 위하 여 수행하였다. 작약 24품종을 대상으로 2022년 국립원예특작 과학원 시험포장에서 개화시기와 절화 품질을 조사하였다. 봉오 리 상태에서 수확한 작약을 건조 저장법으로 -1℃에서 60일 저장한 후 절화 수명과 절화품질을 조사하였다. ‘의성작약’은 홑 꽃이었고 나머지 품종은 겹꽃이었다. 개화시기는 5월 10일부터 18일 사이였으며, ‘Etched Salmon’, ‘Monsieur Jules Elie’, ‘Gilbert’, ‘Henry Bockstoce’는 개화일이 5월 10일로 가장 빨랐고, ‘Elsa Sass’는 5월 18일로 가장 늦었다. 식물체 키는 74.6∼107.8cm 였고, 절화 무게는 ‘Henry Bockstoce’ 품종 이 89.8g으로 가장 무거웠고, ‘Angel Cheeks’ 품종이 26.7g으 로 가장 가벼웠다. 꽃의 주된 색은 흰색, 빨강색, 분홍색, 자주색 이었다. -1℃에서 60일간 저장 후에 꽃과 잎의 상태가 아주 양 호한 품종은 ‘Kansas’, ‘Ole Faithful’, ‘Sonw Mountain’이 었다. 절화수명은 ‘Nick Shaylor’ 품종이 8일로 가장 길었고, 다음으로 ‘Blush Queen’, ‘Elsa Sass’ 품종이 7일이었으며, ‘Gilbert’, ‘Highlight’ 품종이 1일로 가장 짧았다. 작약은 저온 장기 저장에서 일부 품종을 제외하고는 꽃과 잎에 저온장해 증 상이 발생하였다. 이와같은 결과는 작약재배시에 품종 선택과 수확후 저온 장기 저장을 통하여 유통기간을 연장하고 하고자 할 때 기초자료로 활용될 수 있을 것으로 기대된다.

Rapeseed (Brassica napus L.) oil is mostly refined oil (RO). However, with increasing interest in health, the consumption of cold-pressed oil (CPO) without chemical refining is increasing in Korea. In this study, quality characteristics of CPO from rapeseed varieties ‘Jungmo7001’, ‘Jungmo7002’, ‘Jungmo7003’,and ‘Yuryeo’were evaluated and compared with RO, a commercial product. L-value and a-value were lower while b-value was significantly higher for CPO than those for RO. Analysis of fatty acid compositions of each oil revealed that CPO from ‘Yuryeo’contained the highest oleic acid at 74%. Analyses of contents of bioactive compounds in CPOs and RO revealed that contents of tocopherol, β-carotene, and canolol were the highest in CPOs from ‘Jungmo7003’, ‘Jungmo7002’, and ‘Jungmo7001’at 55.5, 0.3, and 0.2 mg/100 g, respectively. In addition, CPOs contained higher contents of bioactive compounds than RO, suggesting that CPO could provide health benefits. The induction period of CPOs measured using Rancimat were 9∼52% longer than that for RO, indicating that CPOs had a higher oxidative stability under given conditions. These results could be used to obtain basic data on quality of domestic rapeseed varieties.

Environmental pollution has led to global warming, which threatens human life. In response, hydrogen is gaining attention as a next-generation energy source that does not emit carbon. Due to its explosive nature, special care must be taken in the safe storage and transportation of hydrogen. Among various storage methods, liquefied storage, which can reduce its volume to 1/800, is considered efficient. However, since its boiling point reaches -253°C, the design of an insulation system is essential. For the design of insulation systems applied to large containers, a membrane-type design is required, which necessitates the use of cryogenic adhesives. To evaluate whether the cryogenic adhesive is properly implemented, assessments such as tensile and shear tests are necessary. This study presents a methodology for shear evaluation. Conventional methods for shear evaluation of adhesives result in slippage, preventing proper assessment. Therefore, a method involving drilling holes in the gripper and pulling from the holes must be applied. Optimal design concerning the size and location of the holes is required, and this study derives optimal values based on finite element analysis. By conducting experiments based on the results of this study, it is expected that the risk of gripper damage will be minimized, allowing for accurate evaluation of the adhesive’s performance.

벗초파리(Drosophila suzukii)는 베리류 작물, 체리, 포도 등에 심각한 수확량 손실을 입히는 해충이다. 잘 알려진 훈증제인 phosphine (PH3)과 ethylformate (EF)를 저온과 병합처리 하면 벗초파리의 살충효과가 상승되는데 그 원인을 규명하고자 본 연구에서는 TUNEL assay 를 이용한 apoptosis 분석과 이차원 전기영동(2DE) 및 MALDI-TOF/TOF를 통한 벗초파리 체내 단백질 변화를 분석하였다. Apoptosis 분 석 결과, 저온과 훈증제 복합 처리구, 각각의 훈증제와 저온 단독 처리구 순으로 apoptosis가 강한 경향을 보였다. 단백질 발현 분석 결과, 약 800 개의 spot이 관찰되어 그 중 가장 변화가 큰 42개의 spot을 동정한 결과, cathepsin D과 heat shock protein 83이 훈증제와 저온 복합처리군에 서 발현이 현저히 증가했다. 이러한 결과는 훈증제와 저온 복합처리에 의한 벗초파리의 살충효과 상승작용에 대한 생리학적 변화를 확인하는 중 요한 지표가 될 수 있다.

When a fire breaks out in a distribution center, it causes a lot of damage. And the most casualties are caused by Fire accidents. Therefore, training for fire prevention should be mandatory at the distribution center. Also, the contents of education should be different in room temperature warehouses and low temperature warehouses. Fire education in low-temperature warehouses should be more emphasized. This is because many fires occur in low-temperature warehouses. In this study, a study was conducted to determine the important order of training hours and contents for fire prevention education according to the type of distribution center. The importance of time and content for safety education in all types of warehouses did not differ significantly. It was first decided that safety prevention training should be conducted periodically in all types of warehouses

Cars using diesel have always had problems with reducing exhaust fumes, and have been studied steadily in this regard. There were studies on the remanufacturing effect of DOC catalyst deactivated by diesel vehicle smoke reduction device, analysis of vehicle fire accident cases caused by damage to diesel vehicle smoke reduction device, and related studies on the remanufacturing effect of diesel vehicle smoke reduction device DPF. This study also developed a burner system in a smoke reduction device suitable for exhaust engines to completely burn smoke generated by institutions using diesel engines in low-temperature exhaust gases. Following the development of the existing high-performance heater, burner structure capable of maintaining ignition state in exhaust flow, pulsation generated by diesel engines, and exhaust flow control unit, the actual configuration, function and effect of the device, development contents, basic data and abnormalities of the vehicle, and comparison with other developed products.