• Progress in Superconductivity and Cryogenics
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• v.15 no.4
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• pp.6-9
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• 2013

Korea Superconducting Tokamak Advanced Research (KSTAR) has a helium refrigeration system (HRS) with the cooling capacity of 9 kW at 4.5 K. Main cold components are composed of 300 tons of superconducting (SC) magnets, main cryostat thermal shields, and SC current feeder system. The HRS comprises six gas storage tanks, a liquid nitrogen tank, the room temperature compression sector, the cold box (C/B), the 1st stage helium distribution box (DB#1), the PLC base local control system interconnected to central control tower and so on. Between HRS and cold components, there's another distribution box (DB#2) nearby the KSTAR device. The entire KSTAR device was constructed in 2007 and has been operated since 2008. This paper will present the maintenance result of the KSTAR HRS during the campaign and discuss the operation record and maintenance history of the KSTAR HRS.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.75
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• pp.117-136
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• 2017

Trade finance services have been played an important role in the Korea trade development history since 1960's. These days the trade environment is confronted by the 4th Industrial revolution and new trade protectionism. So we need to improve the Korea Trade Finance Services in order to improve Korea trade volume. Bank of Korea(BOK) also revised the Rule of Korea Trade Finance in 2014 and enlarged the trade fund for commercial banks where they handle the trade finance to small and medium enterprises(SME) in 2016. This article handle the current state and problems of Korea trade finance services and suggest the improvement measures as follows; First, the commercial banks, which handle trade finance fund, should improve the customs and practice of judge loan for SMEs. Second, the export volume counting rule for trade loan should harmonize between BOK's Rule and Foreign Trade Management Regulation under the Foreign Trade Act. Third, the processing trade and intermediate trade also can use the trade finance like other trade. Fourth, Trade finance should be in balance between export and import finance to defend the new protectionism. It means that the trade finance should expand to import in the certain conditions. Lastly, the related trade promotion agencies and their employees should improve their skills and abilities for handling trade finance.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.22 no.3
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• pp.373-385
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• 1998

The local Nusselt numbers have been measured for a round turbulent jet impinging on the convex surface with and without rib. Liquid crystal/transient method was used to determine the Nusselt number distributions along the surface. The temperature on the surface was measured to within .+-.0.25 deg. C accuracy using liquid crystal and a digital color image processing system. The experiments were made for the jet Reynolds number (Re) 23,000, the dimensionless nozzle-to-surface distance (L/d) from 6 to 10, the dimensionless surface curvature (d/D) 0.056, and the various rib types (height(d$_{1}$) from 1 to 2 mm, pitch (p) from 6 to 32 mm). It was found that the average Nusselt numbers on the convex surface with rib are higher than those without rib, mainly due to an increase in the turbulent intensity caused by flow separation, recirculation and reattachment on the wall surface. In addition, we compared the results by the steady-state method using the gold-film Intrex with those by the transient method.

• Proceedings of the KSME Conference
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• 2003.11a
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• pp.1322-1327
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• 2003

It is important to determine supporting locations for structural stability of a structure under non-uniform load in space interfered by other parts. In this case, There are many local optima with discontinuous design space. Therefore, The traditional optimization methods based on derivative are not suitable. Whereas, Genetic algorithm(GA) based on stochastic search technique is a very robust and general method. This paper has been presented to determine supporting locations of the vertical supports for reducing stress of the KSTAR(Korea super Superconducting Tokamak Advanced Research) IVCC(In-vessel control coil) under non-uniform electromagnetic load and space interfered by other parts using genetic algorithm. For this study, we develop a program combining finite element analysis with a genetic algorithm to perform structural analysis of IVCC. In addition, this paper presents a technique to perform optimization with FEM when design variables are trapped in an incongruent design space.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1988.05a
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• pp.49-51
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• 1988

The heat treatment condition and aging behavior of melt spun amorphous $Fe_{78}B_{13}Si_9$(Metglas 26058-2) were studied with investigating its magnetic properties, i.e., Br, $B_l$, Hc. The optimum heat treatment condition was $400^{\circ}C$, 1 hour under the external field of 200e, and aging was due to the surface oxidation and the appearance of local CSRO (chemical short lange order) with time and temperature. In addition. we investigated the effects of the thickness of the amorphous ribbons on the magnetic properties and aging effect of them.

• Textile Coloration and Finishing
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• v.19 no.6
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• pp.1-6
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• 2007

Opuntia Ficus has been an epiphyte plant since it was introduced in Cheju island as an ornamental plant two hundred years ago. And now it is grown as many as it is designated to local souvenir No.35. The fruit of this plant contains red-purple sap, which is due to be used in coloring clothes. This study aims at confirmation of use possibility as eco-friendly dyeing stuffs on extract from opuntia ficus fruits and contributing to the practical use of natural dyeing. Thus this study was investigated the dyeability of extract from opuntia ficus fruits on the silk fabric. Antioxidants were used ascorbic acid, L-cysteine, prophyl gallete. After dyeing, K/S and dye fastness were measured. The results were as follows; Maximum absorption band of extract from opuntia ficus fruits was 534.5nm. The appropriate dyeing condition was bath ratio 50:1, dyeing temperature $30^{\circ}C$, dyeing concentration 50%, dyeing time 50min, pH 3,concentration of all antioxidants 3%. Addition of antioxidants brought increase of K/S value. And K/S value and dye fastness had the greatest value when ascorbic acid was added

• The Korean Journal of Food & Health Convergence
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• v.5 no.5
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• pp.33-36
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• 2019

Arginine is one of the basic aminoacid found to be associated with histones and also one of the essential aminoacids now. Arginine is provided by diet, and also found to be synthesised in the body through intestinal-renal axis. Justification---BMI---Associated Risks-How to gain body weight---Healthy. Foods to Gain Weight Fast---High-Protein Vegetables and Fruits(with Image)-Recipes---Physical exercises-List of fruits and vegetables grown in Bangladesh with local names, English names and Botanical names-taxonomic family names. Arginine as drug was first approved by FDA and has recognised as a excellent dietary supplement for curing diseases like preeclampsia during gestation, diabetes and insulin resistance in obese patients. Preeclampsia is characterised by high blood pressure and proteinuria in gestational period of after 20 weeks. Severe preeclampsia is characterised by headaches, blurred vision, and inability to have high photovision, nausea and vomiting. L-Arginine along with Vit C and E are given as medical food to the patients and decrease in condition symptoms is the project now under phase II clinical trial. However the role of arginine in ameolirating preeclampsia symptoms is uncertain except with that of hypertension. Arginine is used to treat pain in sickle cell anaemia, lung damage, reperfusion injury, Trauma and shock but should be excluded during sepsis.

• Journal of the Korea Institute of Military Science and Technology
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• v.20 no.4
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• pp.536-542
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• 2017

In this paper, authors described on localization development's results about an electric igniter in thermal battery with a pyrotechnic heat sources. Especially, the development test and evaluation(DT&E) process and the methods in the developments of the electric igniter which is parts of a domestic thermal battery on K-PSAM was in charge of government and developed for defense of a local areas in Korea. We have proposed a process of design and manufacture on the electric igniter. Finally, we verified a quality and a reliability of the electric igniter from test results by Fisher-Snedecor's law and over 99.5 %(C.L. 95 %) for K-PSAM.

• Proceedings of the KIEE Conference
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• 2006.07e
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• pp.19-22
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• 2006

The CMD(Condition Monitoring & Diagnosis) System is used to monitor and analyze the PD(Partial Discharge), Arc, Temperature, Pressure, Gas in Oil and so on for reliability and availability of the substation. Although this system comes into the spotlight as the forecast and management of the failure and fault, there are some problems. For example, the unified standard was not defined, and the effective management of the layed communication network does not performed, limitation of physical space, etc. To resolve above problems, this paper suggests the IEC61850 compatible eCMD system architecture for monitoring and analyzing the CMD factor in substations. The suggested eCMD system consists of CMD-LU(Condition Monitoring & Diagnosis-Local Unit), IED(Intelligent Electronic Device), and engineering centers. The IEC61850 is the international standard that defines communication networks and system in substation.

• Korean Journal Plant Pathology
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• v.14 no.2
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• pp.136-144
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• 1998

Many cloves of native cultivated garlics in Korea were found to be infested by mites when observed with stereo-microscope. The mite was identified by light and scanning electron microscopic observation as Aceria tulipae. Surveying viruses from the vegetatively propagated garlic, highly flexuous, filamentous particles (700∼800 nm) were detected in Aceria tulipae, local lesions of Chenopodium murale after sap transmissions, mosaic garlic leaves inoculated with mite-borne virus by transmission of Aceria tulipae and naturally infected garlic leaves. The mite-borne virus isolated did not react with antisera of aphid-borne potyviruses (LYSV-G, LYSV-L, WoYSV) or carlavirus (GLV), but reacted with antisera of garlic mite-borne viruses (GV-C, GMbMV). In ultratin sections of mite-borne virus infected garlic tissues, aggregates of virus particles and membrane proliferations were found in the parenchyma cells, but cytoplasmic cylindrical inclusions were not observed. Heavily mite-infested plants showed streaking and malformation due to mite feeding. The mite-borne virus was identified as garlic mite-borne mosaic virus (GMbMV), the mite-borne genus Rymovirus of the Potyviridae by mite transmission, morphology of virus particles, serological relationships, host range, distribution pattern of virus particles and inclusion bodies in the infected cells. The results demonstrate that mite-borne virus is one of the major viruses infecting native cultivated garlic plants showing mosaic or streak symptoms in Korea.