• 대한통합의학회지
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• 제6권3호
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• pp.103-112
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• 2018

Purpose : The purpose of this study was to determined the effects of resistance and aerobic exercise on gait ability, physical fitness and body compositions in older women. Method : The subjects were 24 older women who were randomly divided into two groups (resistance exercise, n=12, and aerobic exercise, n=12). They 65~80 years old. The subjects done the Gym-ball, Togu, and senior dance exercise three times per week-for 70 minutes each time for 16 weeks. Body compositions, physical fitness, and gait ability were measured in this study. Result : There were significantly improved the walk performance after exercise training for 16 weeks. In particular, it was more effective on resistance exercise training in older women. There were significant differences in muscle endurance, flexibility, balance, body weight, percent of body fat, and body mass index (BMI) after the exercise program. Conclusion : It was more effective improved on muscle endurance, flexibility, and balance performance after resistance exercise program than an aerobic exercise program in older women.

• Interaction and multiscale mechanics
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• 제1권4호
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• pp.397-409
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• 2008

The interfacial thermal resistance of pristine and defective carbon nanotubes (CNTs) embedded in low-density polyethylene matrix is studied in this paper. Interface thermal resistance in nanosystems is one of the most important factors that lead to the large variation in thermal conductivities in literature and the novelty of this paper lies in the estimation of the interfacial thermal resistance for defective nanotubes-systems. Thermal properties of CNT nanostructures are estimated using molecular dynamics (MD) simulations and the simulations were carried out for various temperatures by rescaling the velocities of carbon atoms in the nanotube. This paper also deals with the mesoscale thermal conductivities of composite systems, using effective medium theories by considering the size effect in the form of interfacial thermal resistance and also using the conventional micromechanical methods like Hashin-Shtrikman bounds and Wakashima-Tsukamoto estimates.

• 대한전자공학회논문지SD
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• 제40권5호
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• pp.290-297
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• 2003

전자와 정공의 온도 관련 이온화 계수로부터 추출한 온도 함수의 유효 이온화 계수 및 전자 이동도를 이용하여 실리콘 전력 MOSFET의 항복 전압과 on 저항을 위한 온도 함수의 해석적 표현식을 유도하였다. 온도 함수의 해석적 항복 전압 결과를 4x10/sup 14/ cm/sup -3/, 1x10/sup 15/ cm/sup -3/, 6x10/sup 16/ cm/sup -3/의 도핑 농도에 대해 각각 실험 결과와 비교하였고, 온도 및 항복 전압 함수의 on 저항 변화도 각각 실험 결과와 비교하였다. 각농도에 따른 온도 함수의 해석적 항복 전압은 77∼300k의 온도 범위에서 실험 결과와 10% 이내의 오차로 잘 일치하였다.

• 대한전자공학회논문지SD
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• 제46권6호
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• pp.1-5
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• 2009

6H-SiC 전자 및 정공의 이온화계수로부터 유효이온화계수를 추출하여 6H-SiC PN 다이오드의 항복전압과 온-저항을 위한 해석적 표현식을 유도하였다. 해석적 모형으로부터 구한 항복전압을 $10^{15}{\sim}10^{18}\;cm^{-3}$의 도핑 농도 범위에서 실험 결과와 비교하여 10% 이내의 오차로 일치하였고, 농도 함수의 온-저항의 해석적 결과도 $5{\times}10^{15}{\sim}10^{16}\;cm^{-3}$의 범위에서 이미 발표된 수치적 결과와 매우 잘 일치하였다.

• 한국임상약학회지
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• 제23권1호
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• pp.20-25
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• 2013

Background & Objectives: Burn injury mortality and septic complication are frequent and well-known in burned pediatric patients. The overuse of antibiotics is the base for development of wound infection by resistant microorganisms as well as opportunist agents. Methods: We have carried out a study of the bacterial profile and antimicrobial resistance clinically important bacteria isolated from burn wound infections in children patients. The most common isolate from burn wound cultures was Pseudomonas aeruginosa (26.8%), followed by Staphylococcus aureus (25.4%), Acinetobacter baumannii (12.7%), coagulase negative staphylococcus (12.0%), Enterococcus faecium (7.7%), Escherichia coli (4.9%), Enterococcus faecalis (3.7%), Burkholderia cepacia (3.0%), Enterobacter cloacae (2.3%) and Klebsiella pneumonia (2.3%). Colistin was very significantly effective drug in gram negative organism, such as Pseudomonas aeruginosa and Acinetobacter baumannii. Results & Conclusion: The resistance rates were 65% and 98% to piperacillin, 63% and 97% to ceftazidime, 28% and 50% to levofloxacin. The most effective antibiotic in gram positive organism, such as Staphylococcus aureus, coagulase negative staphylococcus were moxifloxacin. The resistance rates were 83% and 64% to ciprofloxacin, 80% and 17% to clindamycin.

• The Plant Pathology Journal
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• 제28권1호
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• pp.68-74
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• 2012

Biocontrol microbes have mainly been screened among large collections of microorganisms $via.$ nutrient-rich $in$ $vitro$ assays to identify novel and effective isolates. However, thus far, isolates from only a few genera, mainly spore-forming bacilli, have been commercially developed. In order to isolate field-effective biocontrol microbes, we screened for more than 200 oligotrophic bacterial strains, isolated from rhizospheres of various soil samples in Korea, which induced systemic resistance against the soft-rot disease caused by $Pectobacterium$ $carotovorum$ SCC1; we subsequently conducted in $planta$ bioassay screening. Two oligotrophic bacterial strains were selected for induced systemic disease resistance against the $Tobacco$ $Mosaic$ $Virus$ and the gray mold disease caused by $Botrytis$ $cinerea$. The oligotrophic bacterial strains were identified as $Pseudomonas$ $manteilii$ B001 and $Bacillus$ $cereus$ C003 by biochemical analysis and the phylogenetic analysis of the 16S rRNA sequence. These bacterial strains did not exhibit any antifungal activities against plant pathogenic fungi but evidenced several other beneficial biocontrol traits, including phosphate solubilization and gelatin utilization. Collectively, our results indicate that the isolated oligotrophic bacterial strains possessing induced systemic disease resistance could provide useful tools as effective biopesticides and might be successfully used as cost-effective and preventive biocontrol agents in the field.

• 조명전기설비학회논문지
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• 제19권1호
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• pp.94-100
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• 2005

본 논문은 전류유입위치에 따른 봉상접지전극의 과도 및 실효임펄스임피던스의 특성에 관한 것으로 뇌격전류를 인가하여 실규모 접지봉에 대한 시간영역에서의 성능을 평가하였다. 임펄스전류가 가해진 봉상접지전극의 과도 접지임피던스는 접지저항보다 높게 나타났으며, 접지전극의 길이가 길어짐에 따라 접지저항과 실효임펄스접지임피던스는 감소되었다. 또한 실효임펄스접지임피던스는 짧은 시간범위에서는 급격하게 증가하였다. 접지저항의 저감은 접지시스템의 임펄스임피던스 특성의 개선에 결정적인 역할을 한다. 임펄스전류를 접지봉의 하단에 인가하였을 때 접지봉 전위의 파두부에 고주파의 진동 파형이 포함되고 실효임펄스임피던스는 다른 경우보다 높게 나타났다.

• 해양환경안전학회지
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• 제23권7호
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• pp.965-971
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• 2017

본 논문의 주 목적은 기존선형과 저항을 최소화하는 최적선형에 대한 에너지효율 성능을 평가하는 것이다. 설계 흘수와 설계 선속을 고려하여 대상선박의 선수부 형상을 검토하였다. 실제 운항 상태에서 대상선박의 저항성능을 평가하였다. 상용 전산유체역학(CFD) 코드와 수조 모형시험 자료는 유효마력 평가를 위해 사용되었다. 실제 운항 상태를 고려하여 최소저항을 가지는 최적선형을 제시하였다. 기존선형과 최적선형에 대하여 3가지 선속에서 유효마력을 추정하였다. 최적선형의 저항성능은 기존선형과 비교하여 볼 때 설계속도(12노트)에서 약 6 % 향상된 결과를 보여 주었다. 준추진효율 계수(ETAD, ${\eta}_D$)는 모형시험 자료를 활용하였다. 에너지 효율 성능은 년간 운항일수, 벙커C유 가격, 1일 연료사용량 그리고 연료소비계수를 바탕으로 작성되었다. 최적선형의 에너지 효율 성능은 기존선형과 비교하였을 때 12노트에서 연간 약 3천만원 절약된 결과를 보여 주었다.

• Journal of Information Technology Applications and Management
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• 제10권1호
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• pp.47-59
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• 2003

This study analyses the level of resistance which workers have against the adoption of ERP systems and the factors affecting the resistance to the adoption of the new systems. The major results of the study include 1) about 40% of workers showed resistance to the adoption of ERP systems, and 2) all six factors (technical characteristics of ERP system, functional characteristics of ERP system, implementation approach, task changes caused by the adoption of ERP system, attitude toward change, and altitude toward organization) were proved to affect the resistance to the adoption of the ERP systems. In practice, adoption of ERP system brings significant changes to workers. In order for an organization to succeed, it is necessary to reduce the resistance of workers. Since this study is performed based on a case study, the results of the study may not be generalized. However, the results of the study may provide guidance which organizations can refer in the course of effective personnel management.

• 국제물리치료학회지
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• 제3권2호
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• pp.440-445
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• 2012

The purpose of this study was to assess the effects of lower extremity resistance training using elastic bands on balance in elderly people. Eight elderly persons each were randomly assigned to a test group(resistance exercise group, REG) or a control group(CG). FRT and TUG test were used to compare balance before and after exercise. Exercise programs were implemented three times a week for 40 minutes for nine weeks. They did warm-up exercise for 5 minutes and then lower extremity resistance exercise using elastic bands for 30 minutes. And then they did cool-down exercise for 5 minutes. TUG and FRT significantly decreased but in the control group it did not significantly decrease. In comparison between the groups, TUG and FRT significantly reduced in the resistance exercise group compared to the control group. Lower extremity resistance training using elastic bands performed by elderly persons are considered to be effective in improving balance.