• Journal of the Korean Chemical Society
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• v.31 no.6
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• pp.527-533
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• 1987

Kinetic studies on the complexing of aquamolybdenum(Ⅳ) trimer with thiocyanate have been carried out using the spectrophotometric method. The observed rate constant, $k_{obsd}$ is given by $k_{obsd}\;=\;{k_O + k_H[H^+]^2}(SCN^-) + k_r$. At 25$^{\circ}$C and ionic strength of 2.30 the values of $k_f$ and $k_r$ are $(3.78 {\pm} 0.61) {\times} 10^{-4}M^{-1}s^{-1}$ and $(6.93 {\pm} 2.39) {\times} 10^{-4}s^{-1}$, respectively. Activation parameters are ${\Delta}H^* = 50.71{\pm}6.91 kJmol^{-1}$ and ${\Delta}S^* = -121.65JK^{-1}mol^{-1}$. The mechanism is proposed and discussed.

• Korean Journal of Mineralogy and Petrology
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• v.33 no.2
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• pp.129-141
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• 2020

The Mogok metamorphic belt is a highland area mainly consisting of Archean crystalline rocks, where many ruby mines were distributed in the past, and jewelry has been identified in its alluvium as placer deposit. Minerals that are usually identified with ruby include spinel, garnet, and rubellite. The conglomerates that form the alluvium in which jewelry is found mainly consist of gneiss and clastic pegmatites. In Singu, Mogok, and Momeik areas, a number of pegmatites containing jewelry are distributed in the intrusions of Mogok metamorphic rocks, diorites, and granites. In Singu pegmatites, rubellite, goshenite, and blue and violet apatite occur as gems. In Momeik pegmatites, mushroom-type rubellite, petalite, hambergite, pollucite, and aquamarine can be found. In Mogok pegmatites, topaz, aquamarine, goshenite, and herderite occur are present.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.05a
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• pp.657-659
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• 2022

Hydroponics and aquaponics are attracting attention as they enable automated farm management and stable production thanks to the spread of smart farms. There are issues that need to be addressed in applying smart farm, but one of them is to be able to respond flexibly to demand by automatically deciding when to ship, which requires a method for automatically determining the growth level of crops. In this paper, we focused on the simple fact that the area and volume occupied by crops increase with the growth of them, and showed that it is possible to monitor the growth process of crops with 2D and 3D cameras, and to determine the degree of growth of crops by calculating the area and volume. It is necessary to verify the method by applying it to various environments and crops, but in the case of common crops in hydroponics and aquaponics, it is possible to determine the growth level through the analysis of the acquired image through 2D and 3D camera.

• Journal of Bio-Environment Control
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• v.31 no.1
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• pp.67-76
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• 2022

This study aimed to determine the photosynthesis and growth characteristics of Peucedanum japonicum T. grown under aquaponics in a plant factory (AP) by comparing those grown under hydroponic cultivation system (HP). The AP system raised 30 fishes at a density of 10.6 kg·m^-3 in a 367.5 L tank, and at HP, nutrient solution was controlled with EC 1.3 dS·m^-1 and pH 6.5. The pH level ranged from 4.0 to 7.1 for the AP system and 4.0 to 7.4 for the HP system. The pH level in the AP began to decrease with an increase in nitrate nitrogen (NO₃-N) and lasted bellower than pH 5.5 for 15-67 DAT. It was found that ammonium nitrogen (NH₄-N) continued to increase even under low pH conditions. EC was maintained at 1.3 to 1.5 dS·m^-1 in both systems. The concentration of major mineral elements in the fish tank was higher than that of the hydroponics, except for K and Mg. There was no significant difference in the photosynthesis characteristics, but the PIABS parameters were 30.4% lower in the AP compared to the HP at the 34DAT and 12.0% lower at the 74DAT. There was no significant difference in the growth characteristics, but the petiole length was 56% longer in the leaf grown under the AP system. While there was no significant difference in the fresh and dry weights of leaf and root, the leaf area ratio was 36.43% higher in the AP system. All the integrated results suggest that aquaponics is a highly-sustainable farming to safely produce food by recycling agricultural by-products, and to produce Peucedanum japonicum as much as hydroponics under a proper fish density and pH level.

• Digital Contents
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• no.8 s.135
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• pp.37-42
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• 2004

정보통신부가 주최하고 한국소프트웨어진흥원과 한국데이터베이스진흥센터가 공동으로 주관하는 2004년 디지털콘텐츠 대상 2분기 시상식이 지난달 15일 정보통신부 14층 대회의실에서 개최됐다. 김창곤 정통부 차관, 최준영 정통부 정보통신정책국장, 고현진 한국소프트웨어진흥원장, 원영희 한국데이터베이스진흥센터 전무 등이 참석한 가운데 진행된 이번 시상식에서는 디지털영상, 온라인게임, 교육용콘텐츠, 모바일콘텐츠, 차세대콘텐츠 등 5개 부문에서 각 1개의 작품이 수상의 영예를 안았다. 이번 2분기 디지털콘텐츠 대상 수상작들은 국내 및 해외시장 출시를 앞두고 있는 성공가능성 높은 작품들로 선정됐다. 디지털영상 부문에서는 시네픽스의 두 번째 작품‘아쿠아키즈’가 수상했고, 온라인게임 부문에서는 씨알스페이스의‘디오’가, 교육용콘텐츠 부문에서는 이니엄의‘짱구교실’이 각각 선정됐다. 모바일콘텐츠 부문에서는 그래텍의‘이카리아2’가 선정됐고, 차세대콘텐츠 부문에서는 포인트아이의‘M-Navi’가 선정됐다. 이번디지털콘텐츠 대상 수상업체들은 향후 정통부의 해외 진출과 마케팅을 위한 각종 활동에 우선적으로 참가하는 혜택을 누릴 수 있으며, 연말에 열리는‘디지털콘텐츠페어 2004’전시회에 참가하고, 대통령상 후보에 오르는 자격을 얻게 된다.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.9
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• pp.18-24
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• 1999

Microcellular foaming is being researched as a method of maintaining and improving the mechanical characteristics of plastics as well as saving the material costs. This can not only improve the mechanical properties including impact strength of plastic by producing cells with the size of few ${\mu}$m diameters within the plastic, but also can save the material cost of plastic products with the general volumetric expansion of 2 to 10 times. But quite a long time is required for the gas to be absorbed in the plastic. Therefore consistent research should be done to reduce the saturation time of gas into the plastic and this paper provides the method of water microcellular foaming process as one of the methods using the high diffusivity of water. In addition, we can improve impact property of foamed plastic by using this method.

• Electronics and Telecommunications Trends
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• v.36 no.5
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• pp.62-73
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• 2021

A stable protein source is required to support the rapidly increasing global population, and fishery products are a particularly important part of the required protein supply. However, due to continued overfishing, fishery resources are depleted, and the number of fish caught by fishing boats has stagnated. Consequently, the aquaculture industry is becoming increasingly important. Internationally, smart aquaculture technology that minimizes labor and environmental pollution has been established through technological developments supported by large investments in automation and water treatment technology over the last several decades. In the case of Korea, the aquaculture industry has not yet emerged as a labor-intensive primary industry. However, in recent years various attempts have been made to apply ICT technology to aquaculture to overcome these problems. In this study, domestic and foreign technologies and patent trends for smart aquaculture are analyzed. In addition, the current status of the smart aquaculture cluster business that the Ministry of Oceans and Fisheries has been promoting since 2019 to utilize ICT technology in aquaculture is introduced.

• Electronics and Telecommunications Trends
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• v.38 no.3
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• pp.29-37
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• 2023

With the increasing demand for seafood and technological advancement in aquaculture, the industry has continuously grown. On the other hand, digital twins have been actively applied to various industries. Aquaculture deals with live aquatic animals that are sensitive to growth environment management. Hence, applying a digital twin to smart aquaculture may lead to a substantial economic benefit because it enables the optimization of different variables. We analyze the status of digital twin development in agriculture. The services of the aquafarm digital twin are divided into 1) data management, 2) optimization, and 3) intelligence. Standardization related to the aquafarm digital twin is also discussed. Based on the analyses, the development stage of aquafarm digital twin is defined, and directions of technology development are suggested.

• Tuberculosis and Respiratory Diseases
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• v.60 no.3
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• pp.330-336
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• 2006

Background : Aquaporins (AQPs) may play a role in the pathogenesis of pulmonary inflammation and edema. This study investigated the role ofAQPs in acute lung injury following bleomycin inhalation in rats. Methods : Sprague-Dawley rats were treated via inhalation with 10 U/kg bleomycin hydrochloride dissolved in 5 ml of normal saline. The control rats were treated with 5 ml normal saline. The animals (n = 6-8 rats per group) were sacrificed at 4, 7, and 14 d. The changes in AQP1, AQP4, and AQP5 expression levels over time were analyzed by Western blotting. The nitrate and nitrite concentrations in the bronchoalveolar lavage fluid (BALF) were measured using a modified Griess reaction. ELISA was used to check cytokines. Results : The respiration rates were significantly higher 4 and 7 days after the bleomycin treatment compared with those of the control rats. The tidal volume was lower in rats at 4 days after the bleomycin treatment, and the wet/dry weights of the lung were significantly higher than those of the control group. The nitrite and nitrate concentrations in the BALF from the rats at 4 days after exposure to bleomycin were greater than those from the saline-treated rats. Immunoblotting studies demonstrated that the AQP1 and AQP4 expression levels were lower in the rats at 4 days. However, the AQP4 expression level was higher at 7 days. The AQP5 expression level increased at 4, 7 and 14 days after the bleomycin treatment. Conclusion : This study demonstrates that AQPs are expressed differently in bleomycin-induced pulmonary edema.

• Journal of Bio-Environment Control
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• v.32 no.2
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• pp.122-131
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• 2023

This study was aimed to determine the effects of grow media on the mineral contents of the leaves and growth characteristics of strawberry grown under aquaponics system in a plant factory. For aquaculture, 12 fish (Cyprinus carpio) (total weight, 2.0 kg) were raised in an aquaponics tank (W 0.7 m × L 1.5 m × H 0.45 m, 472.5 L) filled with 367.5 L of water at a density of 5.44 kg·m^-3 and total 34 of strawberry seedlings were transplanted in the pots filed with 200 g of orchid stone, hydroball or polyurethane sponge in the growing bed (W 0.7 m × L 1.5 m × H 0.22 m) laid out with holly acrylic sheet (140×60 mm, Ø80) on the top of the system. The pH and EC of the aquaponic solution was ranged from 7.6 to 4.9 and 0.24-0.91 dS·m^-1, respectively. The concentration of NO_3-N was about 28% lower than that of the hydroponic standard solution, and K, Fe and B were 10, 27 and 3.8 times lower, respectively; however, the mineral contents of strawberry leaves were in the appropriate ranges with lower contents in the leaves grown with sponge media. The organic content (OM), nitrogen (N), phosphorus (P), and potassium (K) of the sludge were 61.5, 5.72, 8.92, and 0.24%, respectively. The leaf area, leaf number, and dry and fresh weights of shoot at 81 DAT were significantly higher in the hydroball, and the average number of fruits per plant was significantly higher in both the orchid stone and hydroball. There was no significant difference in the fresh and dry weights of fruits. Integrated all the results suggest that the orchid stone and hydroball media are more effective to utilize nutrients in solid particles of aquaponic solution, compared to the polyurethane sponge.