• Progress in Superconductivity
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• 제11권1호
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• pp.78-82
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• 2009

We have fabricated a helmet type magnetoencephalogrphy(MEG) with a $1^{st}$ order gradiometer in vacuum to improve the signal-to-noise ratio(SNR) and the boil-off rate of liquid helium(LHe). The axial type first-order gradiometer was fabricated with a double relaxation oscillation SQUID(DROS) sensor which was directly connected with a pickup coil. The neck space of LHe dewar was made to be smaller than that of a conventional dewar, but the LHe boil-off ratio appeared to increase. To reduce the temperature of low Tc SQUID sensor and pickup coil to 9 K, a metal shield made of, such as copper, brass or aluminum, have been usually used for thermal transmission. But the metal shield exhibited high thermal noise and eddy current fluctuation. We quantified the thermal noise and the eddy current fluctuation of metal. In this experiment, we used the bobbin which was made of an alumina to wind Nb superconductive wire for pickup coil and the average noise of coil-in-vacuum type MEG system was $3.5fT/Hz^{1/2}$. Finally, we measured the auditory evoked signal to prove the reliability of coil-in-vacuum type MEG system.

• 대한조선학회논문집
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• 제42권1호
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• pp.43-49
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• 2005

in this paper a dolphin-fender moored pontoon-type floating structure in shallow water depth is studied focusing on mooring force. The pontoon-type floating structure is 500m long, 300m wide. The structure has partially non-uniform drafts of 2.0m and 3.0m. The employed mooring system is a guyed frame type dolphin-fender system. The 1/125 scale model fender system is made of rubber tube to have hi-linear load deflection characteristics. A series of model tests has been conducted focusing on motion and fender force responses in regular and irregular waves at KRISO's ocean engineering basin Non-linear numerical simulation of fender reaction force has been carried out and the results are compared with those of model tests. The simulated rigid body motion and mooring forces also have been compared with the test results.

• 대한안전경영과학회지
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• 제15권2호
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• pp.39-45
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• 2013

Occupational injury rate of Korea recently slides slightly downward after stagnating around 0.7%'s for more than 10 years. To accelerate this trend, injury prevention for small enterprises is crucially important because vast majority of injuries take place in small enterprises. Considering huge number of small enterprises, we need to focus our efforts to type of riskier industries. By analysing detailed injury data, we select type of industries which need our concentrated prevention efforts. Several preventive measures are recommended, after we made literature survey of case studies for small enterprises. The result identifies riskier type of industries including transportation machinery manufacturing industry type(B), woods & veneer manufacturing industry, etc. Safety of machinery, new enterprises less than 2 years in service and new employees serving less than 6 months are in need for focused prevention efforts. To cope with these vulnerable spots, recommended preventive measures include strengthening of machinery safety standards, early assistance for safety to new enterprises, mandatory safety education before employment, etc.

• 대한수의학회지
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• 제33권3호
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• pp.419-427
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• 1993

Thirteen strains of Clostridium perfringens were isolated from the pigs with hemorrhagic enteritis. The characteristics of the outbreaks, clinical signs and lesions were examined. The biochemical properties, type of toxin and susceptibility to antimicrobial agents of the isolates were investigated. The results could be summarized as follows ; 1. Almost of the pigs affected with hemorrhagic enteritis, 17 cases examined from 1989 to 1992, were piglets less than 7 day old. 2. The average mortality rate of piglet less than 7 day old affected with hemorragic and necrotic enteritis was 48.5%. 3. The clinical signs of pigs with hemorrhagic enteritis were depression, hemorrhagic diarrhea, anemia and dehydration. Necropsy of the infected pigs showed typical hemorrhage of upper intestine and necrosis of mucosal membrane. 4. The characteristic biochemical properties of the isolates were 2-band hemolysis, positive reaction of reverse CAMP test and formation of LV precipitate in egg yolk medium. 5. The toxin type of the 13 isolates, investigated by mouse inoculation test, was all type C strains of Clostridium perfringens. 6. In susceptibility test to antimicrobial agents, 13 isolates of Clostridium perfringens were highly sensitive to ampicillin, enrofloxacin(Baytril), cephalothin, penicillin and trimethoprim-sulfamethoxazole.

• 한국의류학회지
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• 제41권2호
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• pp.281-295
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• 2017

This research is about the reproduction of Baekje's armor-lamellar made for the Hanseong Baekje Museum exhibition. The purpose of the research are as follows. First, to categorize Baekje armor by type based on ancient documents and the excavated relics. Second, to reproduce categorized armor that provide a visual work for use in diverse areas. Baekje armor can be examined through the ancient records and several excavated relics. The results of the research are as follows. First, Baekje armor can be categorized into four types by material: 1) brass 2) iron 3) leather 4) bone. The can also be categorized into three types by finishing a) Hyeongnyubongnyun type (the leather skin interweaves with the lamellar armor method) b) Hyeokpobongnyun type (the method which wraps around the edges of leather skin) c) leather cloth added to clothe type. Second, we reproduced metal armor, iron armor and leather armor using brass, iron and leather (but not bone). Each type of armor were made life-size for exhibition purposes. We used Hyeongnyubongnyun method, Hyeokpobongnyung method and leather cloth; in addition, reproductions were made based on the Yangdang method that connected the front and the back from both sides of the shoulders so it can be open and close at the side part.

• 대한치과보철학회지
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• 제40권2호
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• pp.184-192
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• 2002

The purpose of this study was to investigate the abrasion resistance and surface roughness of conventional dental stones and improved dental stones and newly developed dental stones. Materials included in this study were several dental stones and newly developed dental stone; 2 type III. 6 type IV (including newly developed dental stone). 1 type V Ten specimens for each material, total ninety specimens were made. Each specimen was subjected to 50 complete cycle abrasion under constant load 0.42N at speed or 6mm per sec. The depth after abrasion test was measured for each specimen. Surface roughness before and after abrasion test was compared. The results were as follows ; 1. The resin containing die materials such as Tuff Rock and Resin Rock had superior abrasion resistance. 2. Type IV, V dental stone exhibited greater abrasion resistance than Type III dental stone. 3. The results or the surface roughness showed similar pattern with the abrasion resistance.

• 대한안전경영과학회지
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• 제14권3호
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• pp.299-314
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• 2012

In this study, college students, the nature of the locus of control type determines that they affect about career decision making. For this purpose I a systematic and comprehensive study to literature research and empirical research. This research topics and research model based on the hypothesis set and set the hypothesis verified results to the following conclusions were able to elicit. Internals types influence that they showed a positive impact in reasonable career decision making type. Externals types influence that they showed a positive impact in intuitive, dependent career decision making type. The summarized facts, as above, may be empirical analysis results that may be advised during the career decision making of college students, and will be data which will propose a new direction in the career decision making of college students also.

• Journal of Ginseng Research
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• 제41권4호
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• pp.531-533
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• 2017

Background: Panax ginseng has been used as Korean medicine for various diseases. It has antioxidant, hypotensive, sedative, analgesic, and endocrine activities. Dammarane-type triterpenes from the plant have various beneficial effects. Methods: A dammarane-type triterpene saponin was isolated from P. ginseng root through chromatography such as repeated column chromatography and medium pressure liquid chromatography. Results and conclusion: New dammarane-type triterpene saponin was isolated for the first time from nature. The structure was elucidated as ginsenoside Rg12 (1) based on spectral data. There may be good materials from P. ginseng for the development of industrial applications such as nutraceutical, pharmaceutical, and cosmeceutical purposes.

• Archives of Pharmacal Research
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• 제27권10호
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• pp.1060-1064
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• 2004

Although many studies have been performed to elucidate the molecular consequences of ultraviolet irradiation, little is known about the effect of natural products. Ultraviolet irradiation is widely considered to be an environmental stress. Here we investigated the effect of 3,23-dihydroxy- 20(29)-lupen-27-oic acid on the regulation of MMP-1 and type 1 procollagen in Ultraviolet irradiation of cultured old age human dermal fibroblasts. 3, 23-dihydroxy-20(29)-lupen-27- oic acid was isolated from Tiarella polyphylla D. Don (Saxifragaceae). Among them, 3, 23- dihydroxy-20(29)-lupen-27-oic acid induced the regulation of Type 1- procollagen and reduced the regulation of MMP-1 at the protein levels in a dose-dependent manner by ultraviolet irradiation. Taken together, our results suggest that 3, 23-dihydroxy-20(29)-lupen-27-oic acid plays an important role in the induction of Type 1-procollagen and reduction of MMP-1 by ultraviolet irradiation in old age human dermal fibroblasts.

• 척추신경추나의학회지
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• 제14권1호
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• pp.99-118
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• 2019

Objectives : The purpose of this study was to analyze trends of posture pattern in Korean literature. Methods : We searched four Korean databases (NDSL, RISS, OASIS, and KISTI) and classified the studies according to publication year and the study type. Additionally, we analyzed clinical research papers according to the predominant reported posture pattern, the type of study, assessment for clinical outcomes. Results : In total, 50 published studies were included in our analysis, and we determined the following: By study type, there were 37 interventional studies, 6 observational studies and 7 non-clinical research papers. In the interventional studies, the most common posture pattern was the forward head posture pattern, which was investigated in 22 studies. As a tool for evaluating posture pattern, cervical vertebral angle and the height of the scapula inferior angle are used most. Conclusions : Although this study has provided insight into the commonly investigated posture patterns types in Korean clinical studies, further research is required and future studies should include randomized controlled trials and systematic reviews in their analyses.