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( Hui Jung Kim ),( Kang Suk Ko ),( Sang Bae Park ),( Hyeong Il Kim ),( Yang Tong Cho ),( Woong Ji Kim ),( Byung Jun Jeon ),( Hye Min Yu ),( Min Ju Song ),( Yun Kyung Hong ),( Wan Hee Yoo ) 전북대학교 의과학연구소 2007 全北醫大論文集 Vol.31 No.2
Vascular thrombosis in the venous or arterial system is quite common in systemic lupus erythematosus(SLE), especially in patients who have active disease with vasculitis and antiphospholipid antibodies(aPL). These thrombotic events usually developed on deep veins of the lower extremities and very rarely occur on the upper extremities. The upper extremity deep vein thrombosis(UEDVT) is a relatively rare disease, constituting about 2% of all cases of deep venous thrombosis, and usually occurs axially and subclavian vein. Here, we report an unusual case of brachial and basilica vein thrombosis in a 34-yr-old woman with SLE after taking oral contraceptives for 3months before the onset of upper-extremity deep vein thrombosis(UEDVT). Venous Doppler ultrasonography and CT images showed thrombosis and thrombophlebeitis of the brachial and basilica vein of the left arm. Thrombophilia work-up including IgM and IgG anticardiolipin antibodies, lupus anticoagulant were negative. Protein C, Protein S, and antithrombin 3 levels were within normal range. The patient was started anticoagulation therapy and oral contraceptives were discontinued. After that, she was asymptomatic and she had been treated with aspirin 100mg/day.
Yu Hong Jia,Jae Hun Ryu,Cho Hui Kim,Woo Kyung Lee,Thi Van Trinh Tran,Hyo Lee Lee,Rui Hong Zhang,안대희 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
Microbial electrolysis cell is a device which can produce hydrogen gas from biomass through microbial catalyzed process and thus reduce the organic matter. For the real application in wastewater treatment,the scale-up of microbial electrolysis cell is an important issue but few tests were conducted with relatively large size. In this study, a 3.7 L microbial electrolysis cell (liquid volume 3.2 L) equipped with a membrane electrode assembly cathode was designed and tested. The internal resistance was examined,hydrogen generation and organic removal performance was investigated under different conditions. A maximum overall hydrogen efficiency of 41% was achieved at an applied voltage of 1.2 V with acetate as substrate, corresponding to a volumetric hydrogen production rate of approximately 0.12 m3 H2/m3reactor liquid volume/day. The results obtained in this study could help to further develop pilot-MEC for practical applications.
Geon-Hui Lee,Nam-Hui Lee,Kyung-Wook Shin,Gyung-Sun Chae,Seung-Hwan Yu 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
As if the wet storage of Spent Nuclear Fuel (SNF) becomes saturated, a transition from wet storage to dry storage could be required. The first process for dry storage is to move SNF from the wet storage into a canister for dry storage, and secondly perform a drying process to remove the moisture in the canister to prevent a potential impact such as deterioration of cladding or corrosion of the interior material. Nuclear Regulatory Commission (NRC) accepts the conditions describing the adequate dryness state that remain below the pressure of 3 Torr for 30 minutes in the drying process. That is, the most pressure of water vapor that may exist inside the canister is 3 Torr. If it is maintained below 3 Torr, it can be determined that the dryness criterion is satisfied. Based on this, relative humidity and dew point trends can be identified. Relative Humidity (RH) is calculated by dividing the vapor pressure by the saturated vapor pressure. Here, if the vapor pressure is fixed at 3 Torr, which is the dryness criterion value, the relative humidity has a value according to the saturated vapor pressure. Saturated vapor pressure is a value that varies with temperature, so relative humidity varies with temperature. On the other hand, the dew point temperature has a value according to the water vapor pressure. Therefore, when the internal temperature of the canister is 120°C and the water vapor pressure is 3 Torr, the relative humidity is 0.2% and the dew point temperature is -4.4°C. We will confirm the suitability of the dryness criterion through the drying tests, and secure a technology that can measure and evaluate the amount of moisture remaining inside the canister.
Jia, Yu Hong,Ryu, Jae Hun,Kim, Cho Hui,Lee, Woo Kyung,Tran, Thi Van Trinh,Lee, Hyo Lee,Zhang, Rui Hong,Ahn, Dae Hee Elsevier 2012 Journal of industrial and engineering chemistry Vol.18 No.2
<P><B>Abstract</B></P><P>Microbial electrolysis cell is a device which can produce hydrogen gas from biomass through microbial catalyzed process and thus reduce the organic matter. For the real application in wastewater treatment, the scale-up of microbial electrolysis cell is an important issue but few tests were conducted with relatively large size. In this study, a 3.7L microbial electrolysis cell (liquid volume 3.2L) equipped with a membrane electrode assembly cathode was designed and tested. The internal resistance was examined, hydrogen generation and organic removal performance was investigated under different conditions. A maximum overall hydrogen efficiency of 41% was achieved at an applied voltage of 1.2V with acetate as substrate, corresponding to a volumetric hydrogen production rate of approximately 0.12m<SUP>3</SUP> H<SUB>2</SUB>/m<SUP>3</SUP> reactor liquid volume/day. The results obtained in this study could help to further develop pilot-MEC for practical applications.</P>
The Quantification of Residual Water by Using the Drying Process Data in Dry Storage System
Geon-Hui Lee,Nam-Hui Lee,Kyung-Wook Shin,Gyung-Sun Chae,Seung-Hwan Yu 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
For Dry Storage of Spent Nuclear Fuel (SNF), all moisture must be removed from the dry storage canister through subjected to a drying process to ensure the long-term integrity. In NUREG-1536, the evacuation of most water contained within the canister is recommended a pressure of 0.4 kPa (3 torr) to be held in the canister for at least 30 minutes while isolated from active vacuum pumping as a measure of sufficient dryness in the canister. In the existing drying process, the determination of drying end point was determined using a dew point sensor indirectly. Various methods are being studied to quantify the moisture content remaining inside the canister. We presented a moisture quantification method using the drying process variables, like as temperature, pressure, and relative humidity operation data. During the drying process, it exists in the form of a mixed gas of water vapor and air inside the canister. At this time, if the density of water vapor in the mixed gas discharged out of the canister by the vacuum pump is known, the mass of water removed by vacuum drying can be calculated. The canister is equipped with a pressure gauge, thermometer and dew point sensor. The density of water vapor is calculated using the pressure, temperature and relative humidity of the gas obtained from these sensors. First, calculate the saturated water vapor pressure, and then calculate the humidity ratio. The humidity ratio refers to the ratio of water vapor mass to the dry air mass. After calculating the density of dry gas, multiply the density by the humidity ratio to calculate the density of water vapor (kg/m3). Multiply the water vapor density by the volume flow (m3/s) to obtain the mass value of water (kg). The calculated mass value is the mass value obtained per second since it is calculated through the flow data obtained every second, and the amount of water removed can be obtained by summing all the mass values. By comparing this value with the initial moisture content, the amount of moisture remaining inside the canister can be estimated. The validity of the calculations will be verified through an experimental test in the near future. We plan to conduct various research and development to quantify residual water, which is important to ensure the safety of the drying process for dry storage.
Quantification Tests of Residual Moisture After Vacuum Drying
Geon-Hui Lee,Nam-Hui Lee,Kyung-Wook Shin,Gyung-Sun Chae,Jae-Seok Park,Seung-Hwan Yu 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
Measuring the amount of water remaining in the canister after drying is critical to ensuring the integrity of Dry Storage. There are many ways to measure residual moisture, but dew point sensors are typically used to measure residual moisture after drying the canister. Because the dew point temperature inside the canister depends on the water vapor partial pressure, the water vapor partial pressure present in the canister can be determined using the dew point temperature. The British Standard (BS1336) proposes a formula for converting dew point temperature into vapor partial pressure. It is possible to validate changes in residual water concentration throughout drying and at the end of drying. It has around 500 ppmv when the dew point temperature hits -73°C at 3 torr. Nuclear Regulatory Commission (US NRC) presented at 3 torr for 30 minutes as a criterion for the suitability of spent nuclear fuel drying. When the canister’s internal pressure is around 1,000 torr and the dryness criteria are met, the moisture concentration for this value is around 3,000 ppmv. We conducted a vacuum drying test of a 57 liter test vessel. It is filled with helium after vacuum drying was completed, and the concentration of residual water is measured by AquaVolt Moisture Analyzer (AMA) connected by a sample flow line. After the vacuum pressure of 1.5 torr was reached, the test vessel was filled to a pressure of 1,140 torr of helium after 30 minutes. The average temperature inside the basket inside the test vessel is 50°C, the dew point temperature is below -70°C, the pressure of test vessel is around 1,000 torr, and the measurement results of the AMA connected to the sample line showed less than 200 ppmv. From these results, we can evaluate that the residual moisture in the test vessel is about 0.01 gram.
Moon, Kyung-Suk,Yu, Sang-Hui,Bae, Ji-Myung,Oh, Seunghan Hindawi Limited 2012 Journal of nanomaterials Vol.2012 No.-
<P>We cultured human mesenchymal stem cells (hMSCs) on TiO2nanotubes with diameters of 30–100 nm to assess the size-effect of TiO2nanotubes on the behavior and osteogenic functionality of hMSCs. Most studies of the expression of genes encoding alkaline phosphatase (ALP), osteocalcin (OCN), osteopontin (OPN), and integrin-β (INT-B), after 1 week of incubation, supported the results of cell viability and MTT assays at 48 hrs of plating. However, after 2 weeks of incubation, expression of ALP, OPN, INT-B, and protein kinase R-like ER kinase (PERK) genes were significantly higher in cells cultured on 70 nm TiO2nanotubes than that in cells cultured on other TiO2nanotubes and Ti. This biphasic osteogenic characteristic of hMSCs is supposed to relating to the nature of the hMSCs adhering to the substrate at the beginning of incubation, and the nanostructural stimulation caused by the topography of TiO2nanotubes at a later stage of incubation. The discovery of these biphasic characteristics of hMSCs cultured on different-sized TiO2nanotubes may contribute to resolving the discrepant results relating to the size-effect of TiO2nanotubes on the adhesion, proliferation, and functionality of cells.</P>