습식화학 방법에 의한 안정화된 $ZrO_2$의 제조 및 특성에 대한 연구

전승범,변수일 한국세라믹학회 1979 한국세라믹학회지 Vol.16 No.3

This study was to explore the characteristics of 6 mole% CaO stabilized $ZrO_2$ prepared by wet chemical methods. The results of the experiments were as follows: 1. The powder calcined at 1000$^{\circ}$-110$0^{\circ}C$ was partly agglomerated. The morphology of agglomerate was spherical of 0.5-1$\mu{m}$ in size for Hot Petroleum Drying Method, chain-like of 1-2$\mu{m}$ for Freeze Drying Method, and irreqular of 2-3$\mu{m}$ for Coprecipitation Method. 2. Optimum calcining conditions for powder prepared by wet chemical methods were found: 110$0^{\circ}C$, 2h in air for Hot Petroleum Drying Method and Freeze Drying Method, and 100$0^{\circ}C$, 2h in air for Coprecipitation Method. 3. When specimen was calcined at 1000$^{\circ}$-110$0^{\circ}C$ in air for 2h and then sintered at 1$600^{\circ}C$ in air for 4h, the specimens prepared by wet chemical methods showed a high sintered density (94% of theoretical density) and a low open porosity (<0.8%); however, the sintered density of the specimen prepared by Oxide Wet Mixing Method was 90%. 4. The amount of cubic phase of sintered body prepared by wet chemical methods was observed to be higher than the one prepared by Oxide Wet Mixing Method. 5. It was found that Hot petroleum Drying Method, Freeze Drying Method and Coprecipitation Method were nearly the same in respect of the results of stabilization grade and sintered density of CaO-stabilized $ZrO_2$.

WLAN용 SiGe HBT MMIC 가변이득 증폭기 설계 및 제작

전승범,김창우 慶熙大學校 레이저 工學硏究所 2002 레이저공학 Vol.13 No.-

A SiGe HBT variable-gain amplifier(VGA) has been designed and fabricated for Wireless LAN systems. The VGA circuit is based on a Gilbert Cell structure which has good linearity. Design result of the amplifier exhibits a 20.5 dB maximum gain, over 40 dB of gain-control range and fabrication result exhibits a 8.2 dB maximum gain, over 47 dB of gain-control range in 5.15 ∼ 5.35 GHz band. The gain varies linearly as the gain-control voltage varies from O to 3 V.

측쇄에 전 방향족 올리고 아미드를 가지는 고분자의 합성 및 그 열적 성질

전승범,박원호,하완식,Jeon, Seung-Beom,Park, Won-Ho,Ha, Wan-Sik 한국섬유공학회 1988 한국섬유공학회지 Vol.25 No.1

New polymers which have wholly aromatic oligoamides as side chains were synthesized. Poly(N-phenyl acrylamide) (PPA) and poly(N-acryloyl-$\rho$-aminobenzanilide) (PBA) were prepared by the reaction of poly(acrylor chloride) with aniline and $\rho$-aminobenzanilide, respectively. The thermal properties of both polymers were examined by differnetial scanning calorimetry and thermogravimetry. It was found that PPA and PBA were in partly crystalline form, but no melting point could be detected. The Thermal property of the polymers was superior to that of poly(acrylic acid).

소재분석을 위한 고급 연마기 개발 및 생산

전승범 ( Seung Beom Jeon ) 한국복합재료학회 2003 Composites research Vol.16 No.3

불안 민감성과 부적 정서가 걱정에 미치는 영향

전승범(Jun, Seungbum),김은정(Kim, Eunjung) 한국청소년정책연구원 2016 한국청소년연구 Vol.27 No.4

본 연구에서는 불안 민감성과 부적 정서가 걱정에 미치는 영향을 지각된 위협과 불안 통제감이 매개하는지를 검증하였다. 이를 위해 대학생 294명을 대상으로 그들의 걱정 수준과 불안 민감성, 부적정서, 지각된 위협, 불안 통제감의 정도를 측정하였다. 그리고 불안 민감성과 부적 정서가 걱정에 미치는 영향을 지각된 위협과 불안 통제감이 완전 또는 부분 매개 하는지에 따라 네 가지 형태의 연구모형을 설정하고 각각의 모형에 대해 구조 방정식 모형 검증을 수행하여 각 모형의 적합도 정도를 확인하였으며, 연구 모형들 중 가장 자료에 적합한 모형을 찾기 위해 연구 모형들 간의 χ²(df)차이 검증을 수행하였다. 그 결과, 불안 민감성과 부적 정서가 지각된 위협과 불안 민감성을 순차적으로 거쳐 걱정에 영향을 주는 간접 경로와 부적 정서가 걱정에 직접적으로 영향을 주는 직접 경로를 포함한 모형이 자료를 가장 잘 설명하는 것으로 확인되었다. 보다 자세히 살펴보면, 불안 민감성과 걱정 증상과의 관계는 지각된 위협의 하위 요인인 가능성 평가와 불안 통제감에 의해 완전 매개되는 것으로 나타났다. 그리고 부적 정서와 걱정 증상 간의 관계는 지각된 위협의 하위 요인인 가능성 평가와 대가평가 그리고 불안 통제감에 의해 부분 매개되는 것으로 밝혀졌다. 이러한 결과를 중심으로 본 연구의 시사점과 제한점 및 후속 연구에 대한 제안을 논의하였다. The purpose of this study was to investigate and understand how worry occurs and is maintained. The study examined the mediating effects of perceived threat (;PT consists of probability estimates and cost estimates) and anxiety control in relationships between anxiety related variables (i.e., anxiety sensitivity, negative affect) and worry. For the purposes of this study, structural equation modeling analyses, using data from 294 university students was performed. The results indicated that the relationship between anxiety sensitivity and worry was fully mediated by probability estimates and anxiety control. Moreover, the influence of negative affect on worry was partially mediated by probability estimates, cost estimates, and anxiety control. Finally, the implications and limitations of this study and suggestions for future study were discussed.

플라즈마 용사시킨 Carbide Coating층의 고상입자 Erosion 특성에 관한 연구

전승범(S.B. Jeon),남승훈(S.H. Nahm),김종집(J.J. Kim),이주진(J.J. Lee) 한국표면공학회 1990 한국표면공학회지 Vol.23 No.2

근육전위를 이용한 회음허니아의 교정

이해범,최성진,이철호,전승기,최인혁,김남수 한국임상수의학회 2005 한국임상수의학회지 Vol.22 No.4

Two dogs (case 1: 2-year-old intact male German Shepherd-mixed dog and case 2: 4-year-old intact female Jindo mixed) with perineal hernia were referred to the Chonbuk Animal Medical Center, Chonbuk National University. In the both cases, there were unilateral perineal swelling involving the right side of the anus. In addition, in case 2, swelling was also present ventral to the anus. Rectal palpation of pelvic diaphragm revealed weakness of the muscles. Both cases were surgically treated using muscle transposition technique for herniorrhaphy. In case 1, transposition of the superficial gluteal and internal obturator muscles and in case 2, transpositionof semitendinosus muscle was performed for herniorrhaphy and reconstruction of the pelvic diaphragm. Both dogs became recovered after the surgical correction and no complications were observed during 10-month (case1) and 9-month(case2). Muscle transposition can be a useful technique for the treatment of perineal hernia in the dog.

정상 개의 관절액에서 TRAP(Tartrate resistant acid phosphatase)농도 측정

이해범,알람,최성진,박상렬,이영훈,전승기,최인혁,김남수 한국임상수의학회 2005 한국임상수의학회지 Vol.22 No.3

The concentration of tartrate resistant acid phosphatase (TRAP) in synovial fluid of normal stifle joint was investigated in order to establish a baseline data to distinguish between healthy joint and joint with injury of cranial cruciate ligament (CCL). Twenty three mixed-breed healthy dogs free from joint diseases (fourteen adult and nine young) were used in this study. The dogs were sedated and synovial fluid was collected from the femoropatellar compartment of stifle joints by direct arthrocentesis. The concentration of TRAP in synovial fluid was determined using the method of Lang. The concentration of TRAP were 0.083±0.039IU/ml in adult dogs, 0.064±0.023IU/ml in young dogs, 0.075 ±0.028IU/ml in large dogs (>22kg), 0.076±0.046IU/ml in small dogs (<22kg), 0.085±0.036IU/ml in neutered dogs and 0.056±0.022IU/ml in intact dogs. The concentration of TRAP in the neutered dogs was significantly (p<0.05) higher than the intact dogs. This data can be used baseline data for a comparison with joint with injury of cranial cruciate ligament.

실험적 담도폐색에 의한 혈액화학치의 변화

이해범,이병곤,전승기,김남수 한국임상수의학회 2008 한국임상수의학회지 Vol.25 No.5

The aim of this study was to establish an experiment animal model for easy diagnosis and monitoring effect of treatment of cholelithiasis by cholesterol and mixed gall stone. In 12 adult beagle dogs, five dogs there were in the control group and seven dogs in the experiment group with ligated cystic duct. General clinical signs were recorded, CBC and blood chemistry were examined. Control group and experiment group were evaluated every 2 weeks for a period of 20 weeks. The results were (1) Total blirubin, cholesterol, alanine aminotransferase (ALT), aspartate aminotransferase (AST) activity were significantly higher in the experiment group with ligated cystic duct than control group during 2-8 weeks. (2) Total alkaline phosphatase (TALP) activity was significantly higher when compare with control group during 2-8 weeks. Bone alkaline phosphatase(BALP) activity was increased slightly between 2 and 8 weeks but was decreased between 10 and 20 weeks. (3) Blood urea nitrogen (BUN) was decreased between 2 and 8 weeks. After 10 weeks, this was in normal range. (4) On complate blood count (CBC), Ca2+ and P were not changed until 20 weeks. (5) On clinical signs in experimental group, they observed a depression, yellow color of mucus membrane and conjunctiva, xanthinuria and xanthochromic. The present study showed that the experimental animal model with ligated cystic duct was a useful model to study biliary tract disease.

고속도로 휴게소 소형 LPG 저장탱크 폭발에 따른 영향범위 분석

전승덕,이순범,이재영 국제문화기술진흥원 2023 The Journal of the Convergence on Culture Technolo Vol.9 No.6

This study analyzes the risks of explosions of small LPG storage tanks installed at highway rest areas. For this purpose, the ranges of the effect of thermal radiation and overpressure caused by the BLEVE(Boiling Liquid Expansion Vapor Explosion)and VCE(Vapor Cloud Explosion) of a 2900-kg small LPG storage tank installed at highway rest areas were quantitatively evaluated by applying the Areal Location of Hazardous Atmospheres program. The ranges of influence of the derived explosion overpressure and thermal radiation were found to have a maximum radii of 336 m and 423 m, respectively. The study determined that those within 269 m could be severely injured by an explosion overpressure of 3.5 psi, and fatalities from thermal radiation of 10 kw/m2 could occur within 192 m of the exploded storage tank. The safety management plan for the LPG storage tank was discussed while considering the auxiliary facilities of highway rest areas and the extent of the damage impact. These research results will help improve safety accident prevention regulations considering the environment and facilities of the rest areas as well as the safety management of small LPG storage tanks installed at highway rest areas.