• Journal of Ocean Engineering and Technology
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• v.9 no.2
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• pp.89-97
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• 1995

The investigate the effect of fiber orientation on the interlaminar fracture toughness of carbon fiber reinforced plastics three prepregs which are domestic products are used in this paper. Those are used for the unidirectional composites, but only one is used for the cross-ply laminate composites which is molded $[0/90]_{6s},\;[0/45]_{6s},\;and\;[0/45/90]_{4s}$. The specimens used for the mode I and mode II Tests are DCB and ENF samples are examined by scanning electron microscope(SEM). The value of $G_{IC}$ is almost same when modified three calculating methods are applied. The highest value of $G_{IC}$at crack initiation is obtained at the $[0/90]_{6s}$ interlaminar and the lowest one is at the $[0/45/90]_{4s}$ interlaminar. The highest value of $G_{IIC}$ at crack initiation, however, is obtained at the $[0/90]_{6s}$ interlaminar and the lowest one is at the $[0/45]_{6s}$. The photographs of SEM show a difference behaviour between mode I and mode II fracture surface.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.45 no.4
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• pp.21-26
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• 2008

In this paper, a novel 622Mbps burst-mode clock and data recovery (CDR) circuit is proposed for passive optical network (PON) applications. The CDR circuits are implemented with 0.35um CMOS process technology. Locking dynamics is accomplished with instantaneous feature and data are sampled at an optimal timing. This is realized by seven different delay configurations, which are generated from precisely-controlled delay buffers. The experimental results show that the proposed CDR circuits are operating as expected, recovering an incoming 622Mbps burst-mode input data without errors.

• Journal of Technologic Dentistry
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• v.30 no.1
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• pp.65-71
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• 2008

The use of titanium in the field of dentistry has increased, due to their excellent biocompatibility, appropriate mechanical properties, corrosion-resistance and low price. However, many difficulties with the use of titanium for metal-ceramic crowns remain to be solved. The objective of this study was to evaluate the influence of surface modifications on the bonding characteristics of specific titanium porcelain bonded to cast titanium. The surfaces of Titanium were prepared with 4 test groups, i) sandblasted with particles of different size, ii) sandblasted after treated oxidization and oxidized after sandblast. We observed the bond strength and node aspect of titanium and ceramic, and respect to the methods of modifying surface of titanium by the test of mean roughness of surface, Scanning Electron Microscope, and 3-point flexural bend test. The results show that, 1. The specimens, which treated oxidization after process of sandblast with particles of 50um size, were the better for the bond strength in comparison with other specimen. 2. The specimen with process of sandblasting after oxidization treatment were the better for stability of the bond strength. 3. The wettability of titanium surface affect the bond strength.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.17 no.1
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• pp.66-74
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• 2004

Allergic rhinitis is an allergic reaction characterized by sneezing, coughing, itchy nose, mouth and throat, congestion and／or nasal discharge. The offending allergens are usually pollens, molds, dust mites and animal allergens. We aimed to observe inhibitory effects of Bojungikgi-tang on incerase of the number of eosinophil and neutrophil, and protective effects of nasal mucosal tissue in the allergic rhinitis. 1. In Inhibitory Effect of Bojungikgi-tang on Increase of the number of Eosinophil in Serum, Bojungikgi-tang showed significant effects.(p〈0.05) 2. In Inhibitory Effect of Bojungikgi-tang on Increase of the number of Neutrophil in Serum, Bojungikgi-tang showed significant effects.(p〈0.05) 3. In histopathologic change of nasal mucosal tissue, Bojungikgi-tang showed significant protective effects. Depending upon above results, it is considered that Bojungikgi-tang has the inhibitory effects on the process of allergic rhinitis and that it could be used in reliving patients of the symptoms caused by allergic rhinitis.

• Proceedings of the Korea Contents Association Conference
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• 2012.05a
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• pp.261-262
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• 2012

최근 인터넷의 발달로 활발히 게시되고 있는 전문 지식 정보들이 유용한지를 판별하기 위해 시맨틱 웹 등의 기술을 이용한 다양한 소프트웨어들이 개발되고 있다. 이러한 소프트웨어들은 개별적으로 우수하게 지식을 판단할 수 있는 수단을 제공하지만, 이를 통합적으로 관리하여 사용자들의 요구에 적합하게 유용한 소프트웨어를 개발할 수 있는 시스템은 현재 미미한 상태이다. 따라서 이러한 소프트웨어 및 데이터를 통합적으로 관리할 수 있는 시스템이 필요하다. 이를 위해 본 논문에서는 소프트웨어 및 데이터의 통합을 통해 사용자가 원하는 소프트웨어를 등록하고, 이를 데이터와 통합하여 사용할 수 있는 실행 환경을 제공하는 콘텐츠 관리 시스템을 설계한다. 제안하는 시스템은 기존 콘텐츠 관리 시스템보다 사용자가 동적으로 소프트웨어를 등록 및 사용할 수 있는 환경을 제공하기 때문에 경제적인 측면에서는 비용을 절감할 수 있는 콘텐츠를 선택할 수 있으며, 관리적인 측면에서는 소프트웨어 및 데이터 자원의 재활용성을 높일 수 있다.

• Journal of Korean Physical Therapy Science
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• v.6 no.2
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• pp.997-1005
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• 1999

To evaluate the effect of winter intensive training on pulmonary function in high school baseball players, comparisons of various ventilatory parameters were made before and 3-3.5 months of winter intensive tranining. The subjects were 18 members of a high school baseball players with mean age and career of 6.3 and 7.3 years, respectively. The following were mainly observed by spirometry for the study ; respiratory rate, vital capacity(VC), maximum voluntary ventilation(MVV), forced vital capacity (FEV1%) and forced mid-expiratory flow (FEF25-75%). The result obtained are summarized as follow. 1) Resipratory rate, tidal volume, forced vital capacity, 1FEV%, FEF50% and FEF75% showed no significant difference between before and after. 2) MVV in after was significantly(p<0.001) increased to 166 L/min comparing with 136L/min in before. 3) 1FEV in after was significantly(p<0.05) increased to 4.46L comparing with 3.76L in before. 4) PEF in after was significantly(p<0.05) increased to 10.40 L/sec comparing with 9.18 L/sec in before.

• Journal of Information Display
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• v.6 no.4
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• pp.45-48
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• 2005

By applying a critical field treatment instead of the conventional surface treatments such as soft rubber roller, ion beam irradiation, adhesive taping, and laser irradiation, electron emission properties of screen-printed carbon nanotubes (CNTs) were enhanced and investigated based on the emission current-voltage characteristics through scanning electron microscopy. After nanotube emitters were activated at the applied electric-field of 2.5 V/um, the electron emission current density with good uniform emission sites reached the value of 2.13 mA/$cm^2$ , which is 400 times higher than that of the untreated sample, and the turn-on voltage decreased markedly from 700 to 460 V. In addition, enhancement of the alignment of CNTs to the vertical direction was observed.

• Journal of Pharmaceutical Investigation
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• v.27 no.3
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• pp.233-239
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• 1997

Glibenclamide is a second generation sulfonylurea that is orally active as a hypoglycemic drug. It exists as a crystalline powder which is sparingly soluble in water. It was investigated that the potential of glibenclamide to exhibit polymorphism. Three polymorphic modifications (form 1, form 2 and form 3) and three pseudopolymorphic modifications (form 4, form 5 and form 6) were obtained by crystallization from different organic solvents. The isolated crystal forms were characterized by differential scanning calorimetry(DSC), thermogravimetric analysis(TGA) and X-ray crystallography powder diffraction studies. Form 1 was the most stable and melt at $175.4^{\circ}C$. Form 2 was metastable and melt at $151.0^{\circ}C$. Form 3 was a new polymorphic modification because it was different from form 1 and form 2 in X-ray crystallography powder diffraction data. Form 4 was a 1 : 7(toluene : glibenclamide) toluene solvate; form 5 was a 1 : 5(toluene : glibenclamide) toluene solvate; form 6 was a 3 : 8(pentanol : glibenclamide) pentanol solvate. All forms were stable in 3-month storage under 0% or 100% humidity condition. The dissolution rate of form 4 was highest; those of form 2, form 3, form 1, form 5 and form 6 followed.

• Journal of the Korean Institute of Gas
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• v.3 no.3 s.8
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• pp.17-22
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• 1999

This study established management system integrated Safety$\cdot$Health, Management System(SHMS) and Environment Management System(ISO 14000) which satisfy all the systems through analyzing the PSM, SMS, BS 8800 and ISRS. Also, this study presented the guideline model which can make regular document forms in the integrated Safety, Health and Environment Management System. Furthermore, integrating management system developed in this study can reduce the duplication and inefficiency of materials and human resources in chemical industries

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.20 no.1
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• pp.65-74
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• 2008

In Korea, air source heat pump system is less efficient than conventional heat source facilities, such as ground source, river water, because the air temperature in winter season is so low that COP of air source heat pump system drops below 3.0. Therefore, the study on the application of heat pump heating and cooling systems is crucial for the efficient popularization of heat pump. In this work, we present the dynamic analysis of energy consumption for the large resident building by heat resistance-capacitance method. The system simulation of water storage air source heat pump is additionally performed by changing of sizes and locations of the hospital building. The computed results show that energy cost of water storage air source heat pump is low, so it is more economical than absorption chiller & heater.