목적 : 천연 항균, 항산화 물질인 망고스틴의 크산톤 화합물로 코팅된 콘택트렌즈를 제조하여 안과적 질환 예 방을 위한 기능성 콘택트렌즈의 물리·화학적 특성을 연구하였다. 방법 : 콘택트렌즈를 제조하여 IPN기술을 통해 감마망고스틴을 코팅하였다. 제조된 렌즈를 ISO와 식약처기준 을 참고하여 광투과율, 함수율, 산소투과율(Dk/t), 항균, 항산화성 실험을 진행하였다. 결과 : 감마망고스틴 코팅 콘택트렌즈의 가시광선투과율은 93%이다. 자외선은 70% 이상 청광은 30% 이상 차 단한다. 항균 실험에서는 감마망고스틴 코팅 콘택트렌즈의 항균성이 일반렌즈에 비해 5배 이상 효과 있고, 항산화 는 시험별 17.49, 28.46, 36.99%의 항산화율을 보였다. 결론 : 감마망고스틴으로 코팅된 콘택트렌즈는 UV와 청광의 차단율이 일반렌즈에 비해 매우 뛰어나다. 또한, 일반렌즈에 없는 항균, 항산화 활성을 보여 안과적 질환을 예방할 수 있을 것으로 보인다.

Iron (Fe) is a vital element for plants and other organisms, involving in several physiological processes including respiration, chlorophyll biosynthesis, and photosynthesis. Unfortunately, how Fe accumulation regulates in response to light quality has not been well established in plants. Therefore, the aim of the study was to explore the mechanism of Fe homeostasis by light quality. In this study, we found morpho-physiological attributes were significantly improved in response to blue (λmax: 450) compared to white (λ max: 500) and red (λmax: 660) light. The root-shoot length, plant biomass, photosynthesis efficiency (Fv/Fm) and leafgreen (SPAD) significantly declined in response to white and red light. However, these parameters were improved and iron deficiency was substantially alleviated by blue light exposure in alfalfa seedlings. This study might be useful to the forage breeders and farmers for improving alfalfa yield and nutritional benefits.

본 연구는 광질이 장미의 꽃잎 착색에 미치는 영향에 대한 기초자료를 얻고자 수행했다. 꽃눈 분화가 시작된 미니 장미 5품종 ‘Berigamo’(yellowish white), ‘Elpaso Yellow’(yellow), ‘Elpaso’ (bicolor, yellow+orange), ‘Meggiore’(pink), ‘Maasland’(red)를 대상으로 3주간 광질처리를 실시하였다. 광질처리는 300μmol·m-2·s-1 백 색광(W) 대조구와 210μmol·m-2·s-1 백색광에 적색(R), 녹색(G), 청색(B), 원적외선(FR) 및 자외선 B(UVB)을 각 90μmol·m-2·s-1 보광하여 대조구와 동일한 PPFD로 설정하였다. 광질의 꽃잎착색 효과는 품종 특이적으로 R, FR, UVB 보광은 특히 분홍색 품종에서 각각 19.0%, 28.8%, 6.4% 착색을 증진시킨 반면, G와 B 보광은 안토시아닌 함량을 각각 17.8%, 19.0% 감소시켰 다. 황색 품종에서는 UVB보광으로 카로티노이드 함량이 19.6% 증가하였다.

Currently, yellow phosphor of Y3Al5O12:Ce3+ (YAG:Ce) fluorescent material is applied to a 450~480nm blue LED light source to implement a white LED device and it has a simple structure, can obtain sufficient luminance, and is economical. However, in this method, in terms of spectrum analysis, it is difficult to mass-produce white LEDs having the same color coordinates due to color separation cause by the wide wavelength gap between blue and yellow band. There is a disadvantage that it is difficult to control optical properties such as color stability and color rendering. In addition, this method does not emit purple light in the range of 380 to 420nm, so it is white without purple color that can not implement the spectrum of the entire visible light spectrum as like sunlight. Because of this, it is difficult to implement a color rendering index(CRI) of 90 or higher, and natural light characteristics such as sunlight can not be expected. For this, need for a method of implementing sunlight with one LED by using a method of combining phosphors with one light source, rather than a method of combining red, blue, and yellow LEDs. Using this method, the characteristics of an artificial sunlight LED device with a spectrum similar to that of sunlight were demonstrated by implementing LED devices of various color temperatures with high color rendering by injecting phosphors into a 405nm deep blue LED light source. In order to find the spectrum closest to sunlight, different combinations of phosphors were repeatedly fabricated and tested. In addition, reliability and mass productivity were verified through temperature and humidity tests and ink penetration tests.

In this paper, the key assembly of the recently developed light machine gun-Ⅱ sighting device was identified as prone to experiencing horizontal noise caused by unstable voltage fluctuations under high-temperature conditions during the defense environmental stress screening test. The primary objective ot this study is to address the issue of horizontal noise through circuit analysis and device parameter tuning, aiming to eliminate its presence.

목적: 대학생을 대상으로 자외선을 포함한 청색광과 같은 유해광선에 대한 지식과 인식도를 알아보고자 하였다. 방법 : 2023년 4월부터 5월까지 온라인 설문 조사에 응답한 충남지역 대학생 103명을 대상으로 하였다. 설문 은 대상자의 일반적 특성에 관한 문항, 자외선과 청색광 차단렌즈의 착용실태에 대한 문항, 자외선과 청색광에 대 한 지식도 및 인식도 문항, 그리고 차단렌즈 선택을 위한 가이드라인의 요구도 문항으로 구성된 총 15문항의 설문 도구를 사용하였다. 통계분석은 SPSS 18.0을 사용하였다. 결과 : 자외선 차단을 위해 안경이나 콘택트렌즈를 착용하는 비율은 56.3%로 나타났으나 청색광 차단 안경이 나 콘택트렌즈를 사용하는 경우는 35.9%로 상대적으로 낮은 비율로 나타났다. 자외선과 청색광의 유해성에 관한 지식도는 각각 2.58±0.91, 2.44±0.98로 조사되었으며, 자외선과 청색광으로부터 눈 보호가 중요하다고 생각하 는 항목의 평균 점수는 각각 3.49±0.61, 3.35±0.68점으로 조사되어 자외선과 청색광 차단의 중요성에 대한 인 식도는 높은 것으로 나타났다. 결론 : 대학생들의 자외선과 청색광에 대한 지식도와 인식도는 높은 수준이었으나 청색광 차단렌즈에 올바른 선택법에 대한 지식은 낮은 수준을 나타냈다. 이에 청색광 차단렌즈의 올바른 선택을 위한 교육 강화와 가이드라 인의 구축이 필요할 것으로 판단된다.

Cordyceps militaris (C. militaris) is a unique and valuable medicinal fungus belonging to the Cordyceps species. C. militaris is the only fungus that contains cordycepin which is a biologically active compound. In previous studies, light-emitting diodes (LEDs) are known to be effective in increasing cordycepin content, but metabolic profiling of LED-stimulated C. militaris has not been confirmed. Metabolic profiling is essential to understanding the metabolic regulation of cordycepin. This study studied the physiologically active secondary metabolites of C. militaris according to the presence or absence of stimulation of LEDs through GC-MS analysis. Most of the metabolites were detected in both samples, but there was a clear difference in the detected concentration. In particular, C. militaris had a significant difference in amino acid levels when stimulated with LEDs. Our results suggested that LEDs could stimulate amino acid synthesis in C. militaris mycelium to increase the cordycepin content.

This study was performed to evaluate the separation of Sr, Cs, Ba, La, Ce, and Nd using gas pressurized extraction chromatography (GPEC) with anion exchange resin for the quantitation of Neodymium. GPEC is a micro-scaled column chromatography system that provides a constant flow rate by utilizing nitrogen gas. It is overcome the disadvantages of conventional column chromatography by reducing the volume of elution solvent and shortening the analysis time. Here, we compared the conventional column chromatography and the GPEC method. The whole analysis time was decreased by nine times and radioactive wastes were reduced by five times using the GPEC system. Anion exchange resin 1-X4 (200~400 mesh size) was used. The sample was prepared at a 0.8 M nitric acid in methanol solution. The elution solvent was used at a 0.01 M nitric acid in methanol solution. Finally the eluate was analyzed by ICP-MS to determine the identification and recovery. In this case, we applied the natural isotopes of LREEs (139La, 140Ce, and 144Nd) and high activity nuclides (88Sr, 133Cs, and 138Ba) instead of radioactive isotopes for the preliminary test; as a result, unnecessary radioactive waste was not produced. The recoveries were 93.9%, 105.9%, 91.9%, 47.6%, 35.9%, and 79.9% of Sr, Cs, Ba, La, Ce, and Nd, respectively. The reproducibility of recoveries by GPEC were in the range 2.8%–10.9%.

Owing to the increase in saturation rate of the spent fuel storage pond in the Kori nuclear power plant, the interim spent fuel dry storage facility is scheduled to be constructed at the Kori site. To implement safeguards in the new dry storage facility effectively, the concept of “Safeguards-by- Design” (SBD) should be applied to reflect nuclear safeguard provisions in the earliest design stages. Detailed design information pertaining to dry storage facilities has not been determined; however, the design information related to safeguards have been inferred using case studies and interviews with nuclear power plant operators worldwide. On the basis of the results of the case studies on spent fuel dry storage facilities for light water reactors, most countries apply the metal cask method in containment buildings considering safety. Furthermore, Korean operators are also considering the same method owing to tight licensing schedules and safety issues. Using the Facility Safeguardability Assessment (FSA) methodology (one of the safeguard evaluation methodologies), the difference in design between the heavy water reactor spent fuel dry storage facility, an established IAEA safeguards approach reference nuclear facility, and the light water reactor spent fuel dry storage facility (the new nuclear facility) were analyzed. Two major differences were noted as issues pertaining to potential safeguards. First, the difference in design and transport method in terms of the difference in size and weight of the spent nuclear fuel is important; light water reactor fuel is 20 times heavier than heavy water reactor that needs partial defect inspection in assemblies. Second, the difference in safeguard approach owing to the difference between the modular storage method in heavy water reactor and the container type storage method in light water reactor must be considered; movable storage cask renders the IAEA surveillance approach difficult. The results of this study can be used to identify the safeguards requirements in advance, enabling the operator to design new dry storage facilities resulting in timely and cost-effective implementation.

There is no doubt that the BRICS countries established in 2000-01, have already made their mark on the international stage. Increasing relations among BRICS countries with less developed nations through south-south cooperation, especially, China, India, and Russia and with least developed countries are of significant importance. BRICS has been the forerunner of cooperation, collaboration and reformation of the present international governance structure and to move towards multilateralism. Over the years, BRICS has become a platform of, and for the developing countries. The ongoing conflict between Russia and Ukraine has created divisions in the world, impacting diplomatic relations that BRICS needs to address. The fact that Russia is the member of BRICS makes things complicated and new challenges has emerged for the bloc to take necessary actions and policy considerations. The article examines the challenges and opportunities for BRICS (as a bloc) amid Russia-Ukraine conflict in a post pandemic world.

상록바위솔속(Sempervivum)은 돌나물과(Crassulaceae)에 속한 하위 속이며 유라시아와 일부 북아프리카에서 분포한다. 상록바위솔속 식물들은 과거 여러 연구에서 약용작물로 활용될 수 있는 가능성을 나타내었다. 그뿐만 아니라 상록바위솔속 식물은 관상용 식물로도 선호된다. 식물의 관상가치를 높이고 적합한 실내 재배조건을 확립하기 위해 적절한 광조건에 대한 연구가 필요하다. 이에 따라 본 연구에서는 시중에서 쉽게 구할 수 있는 상록바위솔 ‘블랙탑’(Sempervivum ‘Black Top’)을 실험식물로 공시하였으며, 실내재배에서 세 가지 LED 광질에 따른 ‘블랙탑’의 생장에 미치는 영향을 분석하기 위해 18주 이후의 생장 결과를 조사했다. 결과적으로 ‘블랙탑’의 초장은 3000 K 백색 LED (peak 455, 600 nm)에서 가장 큰 것으로 나타났다. 그리고 엽장은 보라색 LED (peak 450, 650 nm)가 가장 큰 것으로 나타났다. 그러나 반대로 엽폭에서는 유의미한 차이가 없는 것으로 나타났다. 한편, 생체중은 6500 K 백색 LED (peak 450, 545 nm)에서 가장 높은 것으로 나타났으며 건물중은 3000 K 백색 LED와 6500 K 백색 LED가 동등한 유의수준을 가지는 것으로 나타났다. 엽록소 수치는 6500 K 백색 LED에서 가장 높게 나타났고 보라색 LED에서는 가장 낮게 나타나 엽록소 수치를 증대시키기 위해서는 분광분포가 균일한 것이 좋은 것으로 나타났다. 이와 연쇄적으로 CIELAB 엽색분석에서 명도를 나타내는 L*은 보라색 LED에서 가장 높게 나타나 스펙트럼이 한 쪽으로 편중될 경우 ‘블랙탑’ 엽색 품질 관리에 불리한 것으로 나타났다. 결과적으로, 위 조사항목들에 대하여 복합적으로 고려할 때 ‘블랙탑’의 생장 촉진과 엽색 품질의 증대를 위해 보라색 LED가 아닌 3000 K 백색 LED 혹은 6500 K의 백색 LED 하에서 재배할 것을 권고한다.