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Effects of Wind Fences on the Wind Environment around Jang Bogo Antarctic Research Station

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Advances in Atmospheric Sciences 2017年第12期34卷 1404-1414页

作者： Jang-Woon WANG Jae-Jin KIM Wonsik CHOI Da-Som MUN Jung-Eun KANG Hataek kwon Jin-soo KIM Kyung-soo HAN Department of Environmental Atmospheric Sciences Pukyong National University 45Yongso-ro Korea Polar Research Institute 26 Songdomirae-ro Yeonsu-gu Department of Spatial Information Engineering Pukyong National University 45Yongso-ro

This study investigated the flow characteristics altered by Jang Bogo Antarctic Research Station using computational fluid dynamics(CFD) modeling. The topography and buildings around Jang Bogo Station were constructed with computeraided-design data in the CFD model domain. We simulated 16 cases with different inflow directions, and compared the flow characteristics with and without Jang Bogo Station for each inflow direction. The wind data recorded by the site’s automatic weather station(AWS) were used for comparison. Wind rose analysis showed that the wind speed and direction after the construction of Jang Bogo Station were quite different from those before construction. We also investigated how virtual wind fences would modify the flow patterns, changing the distance of the fence from the station as well as the porosity of the fence. For westerly inflows, when the AWS was downwind of Jang Bogo Station, the decrease in wind speed was maximized(-81% for west-northwesterly). The wind speed reduction was also greater as the distance of the fence was closer to Jang Bogo Station. With the same distance, the fence with medium porosity(25%–33%) maximized the wind speed *** results suggest that the location and material of the wind fence should be selected carefully, or AWS data should be interpreted cautiously, for particular prevailing wind directions.

关键词： Jang Bogo Antarctic Research Station CFD model observation environment wind fence porosity

Etching characteristics and surface modification of InGaSnO thin films under Cl_(2)/Ar plasma

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Plasma Science and Technology 2023年第10期25卷 91-96页

作者： Young-Hee JOO Jae-Won CHOI Bo HOU Hyuck-In kwon Doo-Seung UM Chang-il KIM Department of Electronic and Electrical Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Firearms and Optics Daeduk UniversityDaejeon 34111Republic of Korea School of Physics and Astronomy Cardiff UniversityCardiff CF243AAUnited Kingdom Department of Electrical Engineering Sejong UniversitySeoul 05006Republic of Korea

Indium gallium tin oxide(IGTO)thin films have the potential for high mobility and lowtemperature processing,which makes them suitable for applications such as display backplanes and high-voltage switching ***,very few studies have investigated the plasmaetching characteristics of IGTO and changes in its properties after *** this study,the etching characteristics of IGTO were investigated using Cl_(2)/Ar plasma,and changes in surface properties were *** showed that the etch rate increased with an increase in the proportion of Cl_(2),with the highest etch rate observed at 69 nm min^(-1)in pure Cl_(2)plasma with a gas flow rate of 100 ***,increased radio-frequency power caused a rise in the etch rate,while a process pressure of 15 m Torr was *** primary etching mechanism for IGTO thin films under Cl_(2)plasma was a chemical reaction,and an increased work function indicated the occurrence of defects on the *** addition,the etching process reduced the surface roughness of Cl_(2)-containing plasma,whereas the etching process in pure Ar plasma increased surface *** study contributes to a better understanding of the plasmaetching characteristics of IGTO and changes in its properties after etching,providing valuable insights for IGTO-based applications.

关键词： InGaSnO Cl2-based plasma etching mechanism surface modification plasma etching

EXPERIMENTAL ESTIMATION OF A SCALING EXPONENT FOR TIP VORTEX CAVITATION VIA ITS INCEPTION TEST IN FULL-AND MODEL-SHIP

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Journal of Hydrodynamics 2012年第5期24卷 658-667页

作者： LEE Jeung-Hoon JUNG Jae-kwon LEE Kyung-Jun HAN Jae-Moon PARK Hyung-Gil SEO Jong-soo Samsung Ship Model Basin(SSMB) Marine Research InstituteSamsung Heavy IndustriesScience TownDaejeon 305-380Korea

Tip vortex cavitation noise of marine propeller became primary concems to reduce hazardous environmental impacts from commercial ship or to keep the underwater surveillance of naval ships. The investigations of the tip vortex and its induced noise are normally conducted through the model test in a water cavitation tunnel. However the Reynolds number of model-test is much smaller than that of the full-scale, which subsequently results in the difference of tip vortex cavitation inception. Hence, the scaling law between model- and full-scales needs to be identified prior to the prediction and assessment of propeller noise in full scale. From previous researches, it is generally known that the incipient caivtation number of tip vortex can be represented as a power of the Reynolds number. However, the power exponent for scaling, which is the main focus of this research, has not been clearly studied yet. This paper deals with the estimation of scaling exponent based on tip vortex cavitation inception test in both full- and model-scale ships. Acoustical measurements as well as several kind of signal processing technique for an inception criterion suggest the scaling exponent as 0.30. The scaling value proposed in this study shows slight difference to the one of most recent research. Besides, extrapolation of model-ship noise measurement using the proposed one predicts the full-scale noise measurement with an acceptable discrepancy.

关键词： tip vortex cavitation underwater radiated noise scaling exponent

QKD system with fast active optical path length compensation

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Science China(Physics,Mechanics & Astronomy) 2017年第6期60卷 1-7页

作者： Byung kwon Park Min soo Lee Min Ki Woo Yong-Su Kim Sang-Wook Han Sung Moon Center for Quantum Information Korea Institute of Science and Technology Department of Nano-materials Science and Engineering Korea University of Science and Technology

We develop a quantum key distribution (QKD) system with fast active optical path length compensation. A rapid and reliable active optical path length compensation scheme is proposed and applied to a plug-and-play QKD system. The system monitors changes in key rates and controls it is own operation automatically. The system achieves its optimal performance within three seconds of operation, which includes a sifted key rate of 5.5 kbps and a quantum bit error rate of less than 2% after an abrupt temperature variation along the 25 km quantum channel. The system also operates well over a 24 h period while completing more than 60 active optical path length compensations.

关键词： quantum key distribution optical path length compensation plug and play field programmable gate array

Ampullary adenomyoma presenting as acute recurrent pancreatitis

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World Journal of Gastroenterology 2007年第20期13卷 2892-2894页

作者： Tae-Hee kwon Do Hyun Park Kwang Yeon Shim Hyun-Deuk Cho Jeong Hoon Park Suck-Ho Lee il-Kwun Chung Hong-soo Kim Sang-Heum Park Sun-Joo Kim Division of Gastroenterology Department of Internal MedicineSoon Chun Hyang University Cheonan HospitalCheonanChoongnam 330-721Korea Division of Gastroenterology Department of PathologySoon Chun Hyang University Cheonan HospitalCheonanChoongnam 330-721Korea

Adenomyoma is a term generally applied to nodular lesions showing proliferation of both epithelial and smooth muscle components. Despite its benign nature,ampullary adenomyoma is usually presented as biliary obstruction. Most cases are misdiagnosed as carcinoma or adenoma by preoperative endoscopic or radiologic procedure. Therefore,it is frequently treated with extensive surgery. To our knowledge,this is the first reported case in English literature of adenomyoma located in the peripancreatic orifice resulting in intermittent pancreatic duct obstruction and recurrent pancreatitis diagnosed by the endoscopic piecemeal resection.

关键词： Ampulla Adenomyoma Acute recurrent pancreatitis Endoscopic resection

Recent advances in stem cell therapy for neurodegenerative disease: Three dimensional tracing and its emerging use

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World Journal of Stem Cells 2021年第9期13卷 1215-1230页

作者： il-kwon Kim Jun-Hee Park Bomi Kim Ki-Chul Hwang Byeong-Wook Song Institute for Bio-Medical Convergence Catholic Kwandong University International St.Mary’s HospitalIncheon Metropolitan City 22711South Korea Institute for Bio-Medical Convergence College of MedicineCatholic Kwandong UniversityGangwon-do 25601South Korea

Neurodegenerative disease is a brain disorder caused by the loss of structure andfunction of neurons that lowers the quality of human life. Apart from the limitedpotential for endogenous regeneration, stem cell-based therapies hold considerablepromise for maintaining homeostatic tissue regeneration and enhancingplasticity. Despite many studies, there remains insufficient evidence for stem celltracing and its correlation with endogenous neural cells in brain tissue with threedimensionalstructures. Recent advancements in tissue optical clearing techniqueshave been developed to overcome the existing shortcomings of cross-sectionaltissue analysis in thick and complex tissues. This review focuses on recentprogress of stem cell treatments to improve neurodegenerative disease, andintroduces tissue optical clearing techniques that can implement a threedimensionalimage as a proof of concept. This review provides a more comprehensiveunderstanding of stem cell tracing that will play an important role inevaluating therapeutic efficacy and cellular interrelationship for regeneration inneurodegenerative diseases.

关键词： Cell tracing Neurodegenerative disease Stem cells Three-dimensional imaging Tissue clearing

Acupuncture for Bell's Palsy:A Systematic Review and Meta-analysis

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Chinese Journal of Integrative Medicine 2012年第1期18卷 48-55页

作者： Jong-In Kim Myeong soo Lee Tae-Young Choi Hyangsook Lee Hyo-Jung kwon Department of Acupuncture and Moxibustion College of Korean MedicineKyung Hee UniversitySeoulRepublic of Korea Brain Disease Research Center Korea Institute of Oriental Medicine DaejeonRepublic of Korea Acupuncture and Meridian Science Research Center College of Korean MedicineKyung Hee UniversitySeoulRepublic of Korea

Objective： To assess the clinical evidence for and against acupuncture as a treatment for Bell＇s palsy. Methods： We conducted a literature search of 15 databases from their inception to December 2010 without language restrictions. We included all randomized clinical trials （RCTs） regardless of their controls. Methodological quality was evaluated using the Cochrane risk of bias assessment tool. Results： Of the 3 474 articles, only eight RCTs met our inclusion criteria. Four RCTs tested the effects of acupuncture against drug therapy on disease response rate. The meta-analysis of these data showed significant improvements in the acupuncture group [n=463, risk ratio （RR）=1.07, 95% CI： 1.02 to 1.13; P=0.006, I^2=0%]. Six RCTs tested the effects of acupuncture plus drug therapy versus drug therapy alone. The meta-analysis of this set of RCTs also showed the favorable effects of acupuncture on disease response rate （n=512, RR=1.11, 95% CI： 1.05 to 1.17; P=0.001, I^2=13%）. Conclusions： The evidence supporting the effectiveness of acupuncture for treating Bell＇s palsy is limited. The number and quality of trials are too low to form firm conclusions. Further rigorous RCTs are warranted but need to overcome the many limitations of the current evidence.

关键词： acupuncture Bell's palsy systematic review

Inferring community properties of benthic macroinvertebrates in streams using Shannon index and exergy

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Frontiers of Earth Science 2014年第1期8卷 44-57页

作者： Tuyen Van NGUYEN Woon-Seok CHO Hungsoo KIM il Hyo JUNG YongKuk KIM Tae-soo CHON Department of Mathematics Pusan National University Busan 609-735 Korea Department of Biological Sciences Pusan National University Busan 609-735 Korea DSPENALO National Robotics Research Center Pusan National University Busan 609-735 Korea Department of Mathematics Kyungpook National University Daegu 702-701 Korea

Definition of ecological integrity based on community analysis has long been a critical issue in risk assessment for sustainable ecosystem management. In this work, two indices （i.e., Shannon index and exergy） were selected for the analysis of community properties of benthic macroinvertebrate community in streams in Korea. For this purpose, the means and variances of both indices were analyzed. The results found an extra scope of structural and functional properties in communities in response to environmental variabilities and anthropogenic disturbances. The combination of these two parameters （four indices） was feasible in identification of disturbance agents （e.g., industrial pollution or organic pollution） and specifying states of communities. The four-aforemen- tioned parameters （means and variances of Shannon index and exergy） were further used as input data in a self- organizing map for the characterization of water quality. Our results suggested that Shannon index and exergy in combination could be utilized as a suitable reference system and would be an efficient tool for assessment of the health of aquatic ecosystems exposed to environmental disturbances.

关键词： benthic macroinvertebrates ecological integ-rity anthropogenic pollution self-organizing map

Effect of Lonicerae Flos extracts on reflux esophagitis with antioxidant activity

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World Journal of Gastroenterology 2009年第38期15卷 4799-4805页

作者： Sae-Kwang Ku Bu-il Seo Ji-Ha Park Gyu-Yeol Park Young-Bae Seo Jae-soo Kim Hyeung-Sik Lee Seong-soo Roh Department of Histology and Anatomy College of Oriental MedicineDaegu Haany University Department of Herbology College of Oriental MedicineDaegu Haany University Department of Herbology College of Oriental MedicineDaejeon University Department of Acupuncture & Moxibustion College of Oriental MedicineDaegu Haany University Department of Clinical Laboratory Science College of Health and TherapyDaegu Haany University

AIM： To observe the effects of traditional antiinflammatory medicine Lonicerae FIos （LF） on rat reflux esophagitis （RE） induced by pylorus and forestomach ligation compared with the well-known proton antioxidant, α-tocopherol. METHODS： Rats were pretreated with three different dosages of LF （500, 250 and 125 mg/kg） orally, once a day for 14 d before pylorus and forestomach ligation. Nine hours after pylorus and forestomach ligation, changes to the stomach and esophagus lesion areas, gastric volumes, acid and pepsin outputs, antioxidant effects, esophageal lipid peroxidation, superoxide dismutase （SOD）, catalase （CAT）, malondialdehyde （MDA）, myeloperoxidase and glutathione （GSH） levels, and collagen contents （marker of flexibility） were observed on the esophageal and fundic histopathology. The results were compared with an α-tocopherol （once orally, 1 h before operation, 30 mg/kg） treated group in which the effects on RE were already ***： Pylorus and forestomach ligations caused marked increases of gross esophageal and gastric mucosa lesion areas, which corresponded with histopathological changes. In addition, increases of esophageal lipid peroxidation, decreases of SOD, CAT, and GSH-free radical scavengers, increases of collagen were observed. However, these pylorus and forestomach ligation induced RE were dose-dependently inhibited by treatment of 500, 250 and 125 mg/kg of LF extract, mediated by antioxidant effects. RE at 250 mg/kg showed similar effects α-tocopherol. CONCLUSION： The results suggest that antioxidant effects of LF could attenuate the severity of RE and prevent the esophageal mucosal damage, and validate its therapeutic use in esophageal reflux disease.

关键词： Reflux esophagitis Tocopherol LoniceraeFlos Antioxidant Myeloperoxidase Pylorus and forestomach ligations