• 대한본초학회지
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• 제39권4호
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• pp.29-35
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• 2024

Objectives : Obesity is an imbalance between energy intake and consumption due to overeating and lack of exercise, and if it persists, it increases non-infectious diseases such as high blood pressure, diabetes, and hyperlipidemia. In this study, we tried to investigate the possibility of using Chamaeneron angustifolia (CA) as a material for anti-obesity by confirming the effect of inhibiting lipid differentiation. Methods : We measured the effects of CA extract on oil-red-o staining, cell cytotoxicity evaluation activity using 3T3-L1 cells. Additionally, we assessed fat decomposition and metabolism-related protein expression through Western blot analysis. Results : In this study, the anti-obesity effects of CA extract were experimentally assessed. Results showed significant inhibition of adipocyte differentiation and accumulation at concentrations of 0.05, 0.1, and 0.2 mg/ml of oil-red-o staining, with reductions of 80% or more. CA notably increased the phosphorylation of AMPK protein expression compared to the control group across all concentrations. Additionally, phosphorylation of ACC significantly increased at a concentration of 0.2 mg/ml compared to the control. PPAR-γ, which regulates adipogenesis, exhibited a significant decrease compared to the control, while protein expression of CPT-1, involved in fatty acid oxidation, showed a concentration-dependent increase across all groups. Therefore, CA extract demonstrates potential as a functional material for anti-obesity by increasing the expression of proteins related to fat decomposition and synthesis while decreasing others. Conclusions : These results suggest that CA may also be useful as an anti-obesity functional substance.

• Archives of Reconstructive Microsurgery
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• 제14권1호
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• pp.63-69
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• 2005

Purpose: The purpose of this study was to analyze the clinical results after Steindler flexoplasty. Materials and Methods: We analyzed 6 cases who had nearly normal finger and wrist joint flexion function, but could not flex elbow joint actively because of upper arm type brachial plexus injury. We performed operation during the period from February 1997 to July 2003. There were 5 males and 1 female with mean age of 28 years (range: $19{\sim}51$ years) when Steindler flexoplasty was done. The average follow-up period was 3 years 11 months (range: 12 months${\sim}$7 years 4 months). We assessed active range of motion of elbow joint, muscle power and elbow function by Mayer & Green grade scale at last follow-up. We assessed how much they were favorable for Steindler flexoplasty and had improvement of upper extremity function and correction of deformity. Results: Postoperative, flexion range of elbow joint improved to average $111.7^{\circ}$ (range: $90{\sim}130^{\circ}$). $25.8^{\circ}$ (range: $15{\sim}45^{\circ}$) in flexion contracture and $16.6^{\circ}$ (range: $10{\sim}35^{\circ}$) in pronation contracture were remained. Range of motion of elbow joint improved to average $85.3^{\circ}$ (range: $45{\sim}105^{\circ}$). Flexion power of elbow joint improved to Grade 5 in all cases. Postoperatively on Mayer & Green grade scale, there were excellent in 3 cases(50%), good in 2 cases(33.3%), fair in 1 case(16.7%). On patient's own assessment of functional improvement, there were excellent in 4 cases(66.6%), good in 1 case(16.7%) and fair in 1 case(l6.7%). Conclusion: Steindler flexoplasty can reserve good clinical results with being improved to active flexion of elbow joint in cases who have functional hand and wrist, but paralysis upper arm muscle in brachial plexus injury.

• 한국재료학회지
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• 제6권8호
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• pp.779-785
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• 1996

Co/Nb 이중층 구조의 RTA처리에 따른 층역전 현상을 이용하여 ${CoSi}_{2}$를 형성하였다. 중간에 삽입된 Nb층은 산화성향이 매우 커서 Si와 Co의 균일한 반응을 방해하는 Si 기판 표면의 산화막을 충분히 제거해 줄 수 있을 뿐만아니라 Co 의 실리사이드화 반응시에 Co와 결합하여 안정한 화합물을 형성해서 기판 Si의 과잉 소모를 막아 줌으로써 실리사이드화 반응을 제어하는 역할을 하는 것으로 나타났다. Co/Nb이중층 구조를 $800^{\circ}C$에서 열처리하여 얻은 최종 구조는 ${NB}_{2}{O}_{5}$/${Co}_{2}$Si.CoSi/${NbCo}_{x}$/Nb(O,C)/${CoSi}_{2}$/Si으로 이층들간의 역전과 안정한 ${CoSi}_{2}$상의 형성은 비교적 고온인 약 $700^{\circ}C$부터 시작되었으며, 전 열처리 온도구간에서 Nb의 실리사이드가 발견되지 않았는데, 이러한 점들은 모두 Nb 산화물이나 Co-Nb합금층과 같은 매우 안정한 중간 구조상들이 Co와 Si의 원활한 이동을 제한하기 때문으로 보인다.

• 한국태양에너지학회 논문집
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• 제28권1호
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• pp.9-17
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• 2008

An experimental investigation has been carried out to study the effects of different working fluids on the behavior and thermal performance of a hi-directional thermodiode. The thermodiode was made up of two rectangular loops mounted between a collector plate and a radiator plate. Rotatable joints between the horizontal and inclined segments of the loops enable easy alteration of the direction of heat transfer. The loops and the tank were filled with a working fluid for effective heat transfer when the thermodiode was forwarded biased. Six different working fluids were tested with thermal conductivity values ranging from 0.1 to $0.56W/m-^{\circ}C$, thermal expansion coefficient values ranging from $1.8\;{\times}10^{-4}$ to $1.3\;{\times}\;10^{-3}\;K^{-1}$, and kinematic viscosity values ranging from $0.65\;{\times}\;10^{-6}$ to $100\;{\times}\;10^{-6}\;m^2/s$. Especially, mixtures of $Al_2O_3$ (30nm Particle) in deionized water have been tested for the volumetric ratios of 0.01, 0.02, 0.03, 0.1, 0.2%. Each experiment was carried out after the loop was filled with a working fluid for effective heat transfer and the thermodiode was forwarded biased. The solar thermodiode was heated by a radiant heater consisting of 20 halogen lamps that generated a heat flux of about $1000\;W/m^2$ on the collector surface. Results are given in terms of temperature development in different parts of the loop as heat is delivered from its hot end to the surrounding atmosphere by the radiator made of copper plates.

• 자원환경지질
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• 제30권3호
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• pp.197-207
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• 1997

Rocks in the Cheongsong mine area consist of Precambrian gneiss, Cretaceous sedimentry rocks and late Cretaceous quartz porphyry. The Cheongsong deposit is composed of many hydrothermal quartz veins of strikes $N30^{\circ}{\sim}60^{\circ}W$, dips $60{\sim}85^{\circ}E$ which fill WNW fault system. Pyrite and hematite occur within transparent quartz near margins of early stage II, and milky quartz of middle stage II coexists with sphalerite, chalcopyrite and galena coexisting with Cu-Pb-Bi minerals in center part of stage II quartz veins. Stage III calcite vein filled cracks or fractures of earlier quartz veins contains native copper and chalcopyrite. Supergene minerals are chalcocite, covellite, malanchite and chrysocolla. Alteration minerals are sericite, chlorite, argillite, epitode and pyrite. Ranges of salinities and homogenization temperatures for fluid inclusions in the individual periods of stage II are: 3.7 to 7.8 wt.% eq. NaCl and 200 to $380^{\circ}C$ in transparent quartz of early stage II; 0.7 to 6.4 wt.% eq. NaCl and 200 to $320^{\circ}C$ in milky quartz of middle stage II; 0.0 to 0.9 wt.% eq. NaCl and 250 to $320^{\circ}C$ in calcite of late stage II. Those of stage III calcite range about 0 wt.% eq. NaCl, and from 140 to $260^{\circ}C$, respectively. The relationship between salinities and temperatures shows decrease tendency with paragenetic time from stage II to III. The ${\delta}^{18}O_{H_2O}$ value is 0.5‰ in stage I, range from 0.5 to -0.4‰ in stage II, and from -3.2 to -3.7‰ in stage III. Calcite in the stage II and stage III has ${\delta}^{13}C$ values of -5.0‰ and -4.5 to -4.9‰, respectively. There is a decrease in sulfur fugacity values with paragenetic time of stage II, from $10^{-6.3}$ atm for early mineralization, to $10^{-6.5}$ atm for middle stage, to $10^{-8.0}$ atm for late mineralization of stage II. The results of stable isotope and fluid inclusion indicate that ore fluids reacted with meteoric water and wall rock in the Cheongsong hydrothermal system.

• 한국재료학회지
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• 제18권5호
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• pp.283-288
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• 2008

The effect of sintering aids and glass-frit on the densification and resistivity of silver paste was investigated in an effort to enhance the sintered density and electrical conductivity of the silver electrode. To prepare Pb-free silver paste for use at low sintering temperatures, two commercial silver powders ($0.8\;{\mu}m$ and $1.6\;{\mu}m$ in size) and 5wt.% lab-synthesized nanoparticles (30-50 nm in size) as a sintering aids were mixed with 3 wt.% or 6 wt.% of glass frit ($Bi_2O_3$-based) using a solvent and three roll mills. Thick films from the silver paste were prepared by means of screen printing on an alumina substrate followed by sintering at $450^{\circ}C$ to $550^{\circ}C$ for 15 min. Silver thick films from the paste with bimodal particles showed a high packing density, high densification during sintering and low resistivity compared to films created using monomodal particles. Silver nanoparticles as a sintering aid enhanced the densification of commercial silver powder at a low sintering temperature and induced low resistivity in the silver thick film. The glass frit also enhanced the densification of the films through liquid phase sintering; however, the optimum content of glass frit is necessary to ensure that a dense microstructure and low resistivity are obtained, as excessive glass-frit can provoke low conductivity due to the interconnection of the glass phase with the high resistivity between the silver particles.

• Journal of Magnetics
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• 제20권2호
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• pp.103-109
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• 2015

In this study, the authors attempted to produce a medical radiation shielding fiber that can be produced at a nanosize scale and that is, unlike lead, harmless to the human body. The performance of the proposed medical radiation shielding fiber was then evaluated. First, diamagnetic bismuth oxide, an element which, among elements that have a high atomic number and density, is harmless to the human body, was selected as the shielding material. Next, 10-100 nm sized nanoparticles in powder form were prepared by ball milling the bismuth oxide ($Bi_2O_3$), the average particle size of which is $1-500{\mu}m$, for approximately 10 minutes. The manufactured bismuth oxide was formed into a colloidal solution, and the radiation shielding fabric was fabricated by curing after coating the solution on one side or both sides of the fabric. The thicknesses of the shielding sheets prepared with bismuth oxide were 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 1.0 mm. An experimental method was used to measure the absorbed dose and irradiation dose by using the lead equivalent test method of X-ray protection goods presented by Korean Industrial Standards; the resultant shielding rate was then calculated. From the results of this study, the X-ray shielding effect of the shielding sheet with 0.1 mm thickness was about 55.37% against 50 keV X-ray, and the X-ray shielding effect in the case of 1.0 mm thickness showed shielding characteristics of about 99.36% against 50 keV X-ray. In conclusion, it is considered that nanosized-bismuth radiation shielding fiber developed in this research will contribute to reducing the effects of primary X-ray and secondary X-ray such as when using a scattering beam at a low level exposure.

• 한국환경과학회지
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• 제16권3호
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• pp.299-310
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• 2007

It will be necessary to make proper management plans to preserve the air quality in good level for the public. In order to make these plans, source information and detail emission inventories of the city and near industrial areas should be given. However, lack of the source measurements data makes us more difficult to complete the source inventory. VOC source Inventory could be utilized for the feasibility study to estimate the contribution of VOC sources presenting to the receptor such as residential area. It may give policy maker an idea how to control the air quality, and improve their social environment in the area. This study shows data that measured VOCs concentrations from the local industrial areas in Jeonju during from May 2005 to January 2006. The samples were collected from the near sources in 7 major factories in the industrial park as well as 5 general sources in near city Jeonju area to elucidate the abundances of speciated VOCs and their spacial and temporal distributions depending on source bases. Industrial sources are as follows; chemical, food, paper, wood, metal, non-metal (glass), and painting (coating) industries. The 5 general sources are sampled from tunnel, gasoline gas station, dry cleaning shop, printing (copy) shop, and road pavement working place in urban area. To understand the near source effect at receptor, samples from the 2 receptor sites (one is at center of the industrial complex and the other site is at distance residential area downwind from the center) were collected and analyzed for the comparison to source concentration. The mass contributions of the speciated VOC to total mass of VOCs measured from the different sources and ambient (2 receptors) were presented and discussed.

• Transactions on Electrical and Electronic Materials
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• 제1권2호
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• pp.32-37
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• 2000

Effect of alloying element additions to Ag on thermal conductivity and electrical conductivity of sheath materials for Bi-Pb-Sr-Ca-Cu-O(BSCCO) tapes has been characterized. The thermal conductivity at low temperature range (10~300K) of Ag and Ag alloys were evaluated by both direct and indirect measurement techniqueas and compared with each other, It was observed that the thermal conductivity decreases with increasing the content of alloying element such as Au, Pd and Mg. Thermal conductivity of pure Ag at 3 0K was measured to be 994.0 W(m.K) on the other hand, the corresponding values of $Ag_{0.9995}Mg_{0.0005}$, $Ag_{0.974}$, $Au_{0.025}$, $Mg_{0.001}$, $Ab_{0.973}$, $Au_{0.025}$, $Mg_{0.002}$ and $Ag_{0.92}$, $Pb_{0.06}$, $Mg_{0.02}$ were 342.6, 62.1, 59.2 and 28.9 W(m.K), respectively, indicating 3 to 30 times lower than that of pure Ag. In addition, the thermal conductivity of pure Ag measured by direct and indirect measurement techniques was 303.2 and 363.8 W(m.K) The difference in this study is considered to be within an acceptable error range compared to the reference data.

• 패션비즈니스
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• 제5권4호
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• pp.127-143
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• 2001

This thesis looks into the characteristics and compares the clothing styles between the Three Kingdom to the Unified Shilla era. The purpose of this study is to see what common themes exists between the foundation of Korean clothing and how it has evolved and through see to what extent the Chinese influence has been to Korean clothing culture. Also by explaining the originality and creativity of Korean clothing, we will be able to make clear the status of Korean culture. These findings include the following; 1. The Korean strait line Gik-ryong Kyo-im can also be found at the Gochang region in the west. 2. The Ban-ryong-ui, worn by the aristocrats of the Three kingdom and Unified Shilla era, began to appear from the nobles from the Nam-Buk cho(South-north era). This combined with a Bokdu(headwear) became a part of casual dress wear. 3. Go(pants) became a traditional part of clothing for Unified Shilla and the west. 4. Ban-bi and Bae-dang, all forms of Bansu-ui ( short sleeve), came from Chinas Kucha and Hotan and came to Korea. 5. Chinas Pae-baek and Pae-za (Shawl) which is the same as Unified Shillas Peo was also to be found to have come from the west. 6. The way a different color line was added to clothing both can be found in Korean and western clothing. Similarities to material used are; First, expensive wool was used and mostly originated from the west. From far away Rome came the O-saek-gae (Five-color wool). Secondly, Kong-gak me (peacock feather) and Bi-chi mo were all originated from the west. Third, Sil-sil is stated in the Sam-kuk Sa-ki (Three Kingdom records) as being prohibited to be worn by Jin-gol women (Highest nobility during Shilla era) as headwear or comb (pin) or as a comb(pin) for yuk-doo poom ( 6th class nobility) women. Suggesting that it existed and other sources tell us that it came from Tashkent region of Russia and was a jewelry of some sort. From what we have seen above, we can see the similarities between Korean and western clothing cultures and that these interactions not only occurred with China but with many other nations. We can see that our ancestors were creative and original that when importing foreign cultures that they transformed them into a Korean style. That these foreign cultures were transformed into our own style is good evidence to these facts.