• 한국신뢰성학회지:신뢰성응용연구
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• 제15권3호
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• pp.139-144
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• 2015

Track drive unit adopted in the small sized excavator generally have been used in the construction equipment under the 10 tons as the driving device with forwarding and reversing of excavator. It is required to study the accelerated life test applied by over torque and speed to test the durability life test reflected the many driving modes of small sized excavator and also need to equip the comprehensive performance and life test equipments to do the various performance tests. This study had analyzed the failure modes of the components, and calculated the equivalent loads investigated the used loads in the real field conditions and elicits the acceleration factor adopted in the inverse power model. Also, this study have considered the changes of the acceleration factor and the durability test time in the case of the rotary group and the bearing through analyzing the main failure modes. It was calculated the no failure test time about 2 samples and confidence level 90% and elicited the accelerated life time 720 hours.

• 한국컴퓨터정보학회논문지
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• 제24권10호
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• pp.195-203
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• 2019

군 내 복무 부적응 병사들로 인한 병영사고는 비전투력 손실에 따른 전투력 약화, 대군 신뢰도 저하 등 많은 문제를 유발한다. 군은 복무 부적응 병사들을 사전에 식별하고 사고를 예방하기 위한 심리검사체계로 신인성검사를 개발, 적용하고 있다. 본 논문에서는 사고 우려자를 식별하기 위해 부적응 병사의 행동 패턴과 증상을 온톨로지로 구현하기 위한 온톨로지 설계 프로세스를 제안한다. 온톨로지 설계 프로세스에 따라 설계한 온톨로지의 성능 평가 결과, 적합성 및 효과성이 검증되었다. 온톨로지 설계를 통해 부적응 병사를 식별하기 위한 군 내 객관적인 기준을 제시하고 사고 우려자에 관한 정보를 공유함으로써 사고 예방에 효과적인 역할을 할 것으로 기대된다.

• Structural Engineering and Mechanics
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• 제60권6호
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• pp.953-977
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• 2016

Modern performance-based design methods require ways to determine the factual behavior of structures subjected to earthquakes. Drift ratio demands are important measures of structural and/or nonstructural damage of the structures in performance-based design. In this study, global drift ratio and interstory drift ratio demands, obtained by nonlinear time history analysis of three generic RC frames using code-compatible ground motion record sets, are statistically evaluated. Several ground motion record sets compatible with elastic design spectra defined for the local soil classes in Turkish Earthquake Code are used for the analyses. Variation of the drift ratio demands obtained from ground motion records in the sets and difference between the mean of drift ratio demands calculated for ground motion sets are evaluated. The results of the study indicate that i) variation of maximum drift ratio demands in the sets were high; ii) different drift ratio demands are calculated using different ground motion record sets although they are compatible with the same design spectra; iii) the effect of variability due to random causes on the total variability of drift ratio demands is much larger than the effect of variability due to differences between the mean of ground motion record sets; iv) global and interstory drift ratio demands obtained for different ground motion record sets can be accepted as simply random samples of the same population at %95 confidence level. The results are valid for all the generic frames and local soil classes considered in this study.

• The Korean Journal of Physiology and Pharmacology
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• 제25권6호
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• pp.545-553
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• 2021

Fixed-dose combinations development requires pharmacokinetic drugdrug interaction (DDI) studies between active ingredients. For some drugs, pharmacokinetic properties such as long half-life or delayed distribution, make it difficult to conduct such clinical trials and to estimate the exact magnitude of DDI. In this study, the conventional (non-compartmental analysis and bioequivalence [BE]) and model-based analyses were compared for their performance to evaluate DDI using amlodipine as an example. Raw data without DDI or simulated data using pharmacokinetic models were compared to the data obtained after concomitant administration. Regardless of the methodology, all the results fell within the classical BE limit. It was shown that the model-based approach may be valid as the conventional approach and reduce the possibility of DDI overestimation. Several advantages (i.e., quantitative changes in parameters and precision of confidence interval) of the model-based approach were demonstrated, and possible application methods were proposed. Therefore, it is expected that the model-based analysis is appropriately utilized according to the situation and purpose.

• 한방재활의학과학회지
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• 제31권4호
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• pp.193-201
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• 2021

The aim of this study was to report the effect of Korean medicine treatment with scalp acupuncture of patient with lateropulsion, dizziness, headache caused by lateral medullary infarction. We treated the patient with scalp acupuncture, acupuncture, herbal medicine. Numeric rating scale (NRS), Korean version of berg balance scale (K-BBS), gait balance evaluation, dizziness handicap inventory (DHI), activities-specific balance confidence scale (ABC) and vestibular disorders activities of daily living scale (VADL) were used to evaluate symptoms. NRS of Lateropulsion, dizziness, headache were decreased. K-BBS score increased from 4 to 56, and in the gait balance evaluation, it returned to normal. DHI, VADL score were decreased and ABC score increased from 0 to 1,300. This case report shows that Korean medicine treatment with scalp acupuncture can be effective in lateral medullary infarction. However, further controlled studies are needed to confirm the effect of scalp acupuncture on such patients.

• International Journal of Internet, Broadcasting and Communication
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• 제13권1호
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• pp.107-115
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• 2021

This paper presents a smartphone application for the clinical practice education conducted in hospitals, with an aim to evaluate its effectiveness. A nonequivalent control group posttest design was used, which included a total of 100 nursing of school students who conducted their clinical practice. They were divided into one control and one experimental group (50 students each). The control group was directly trained in the clinical practice orientation, and the experimental group was a group who self-learned the clinical practice orientation using a smartphone application. Research data were collected between March 5 and April 27, 2019. They were analyzed with descriptive statistics and independent t-test, using the SPSS Statistics Version 24. The smartphone application customized for the clinical practice education was implemented through the following four phases: analysis, design, development, and evaluation. The developed application was registered in Google Play (for Android apps) and Apple Store, and related information was provided, making it available for download. The study showed that the satisfaction with and self-confidence in learning differed significantly between the groups. However, technology acceptance and knowledge acquired through practice showed no statistically significant difference. The research results serve as basic data for applying smartphone applications as an educational method that can replace traditional modes of education, serving as a significant indicator of the education delivery method diversification.

• Nuclear Engineering and Technology
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• 제53권4호
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• pp.1331-1344
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• 2021

This study is to evaluate the seismic capacity of the fire-damaged cabinet facility in a nuclear power plant (NPP). A prototype of an electrical cabinet is modeled using OpenSees for the numerical simulation. To capture the nonlinear behavior of the cabinet, the constitutive law of the material model under the fire environment is considered. The experimental record from the impact hammer test is extracted trough the frequency-domain decomposition (FDD) method, which is used to verify the effectiveness of the numerical model through modal assurance criteria (MAC). Assuming different temperatures, the nonlinear time history analysis is conducted using a set of fifty earthquakes and the seismic outputs are investigated by the fragility analysis. To get a threshold of intensity measure, the Monte Carlo Simulation (MCS) is adopted for uncertainty reduction purposes. Finally, a capacity estimation model has been proposed through the investigation, which will be helpful for the engineer or NPP operator to evaluate the fire-damaged cabinet strength under seismic excitation. This capacity model is presented in terms of the High Confidence of Low Probability of Failure (HCLPF) point. The results are validated by the proper judgment and can be used to analyze the influences of fire on the electrical cabinet.

• Physical Therapy Rehabilitation Science
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• 제12권1호
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• pp.12-18
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• 2023

Objective: Chemotherapy is usually given to inhibit cancer progression. It is the most common side effect of chemotherapyinduced peripheral neuropathy (CIPN) after chemotherapy, and its symptoms include pain such as paresthesia, dysesthesia, allodynia, hyperalgesia, and electrical stimulation. Therefore, in this review, randomized controlled trials (RCTs) were combined to analyze the effect qualitatively and quantitatively in order to find out the effect of manual therapy on patients with CIPN through a meta-analysis. Design: A systematic review and meta-analysis Methods: This review conducted a literature search through international databases (CINAHL, Embase, MEDLINE, Web of Science) in December 2022 to synthesize the effect of manual therapy on the symptomatic improvement of CIPN. Qualitative evaluation (risk of bias) and quantitative evaluation using ReVMan provided by the Cochrane Group were expressed as a random effect model and standardized mean difference (SMD). Results: In four RCTs 165 patients with CIPN were evaluated for symptoms of neuropathy. The experimental group consisting of manual therapy and its subcategories showed significant improvement compared to the control group. The results analyzed through the random effects model were SMD=-1.11; 95% confidence interval, -1.97 to -0.24. Conclusions: We came to the conclusion that manual therapy could significantly contribute to improving the symptoms of CIPN, and since it may vary depending on the technique of manual therapy, further studies on manual therapy suitable for neuropathy are needed.

• Physical Therapy Rehabilitation Science
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• 제12권2호
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• pp.115-122
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• 2023

Objective: A previous study reported that cardiovascular training (CT) decreased interleukin-6 (IL-6), a pro-inflammatory cytokine with bidirectional effects. However, because of conflicting results of increasing and decreasing IL-6 levels in stroke patients, it is essential to clarify the effects of CT on IL-6 levels in this population. Therefore, this review aimed to investigate the effects of CT on IL-6 levels in stroke patients through a meta-analysis of randomized controlled trials (RCTs), synthesizing and analyzing the effects qualitatively and quantitatively. Design: A systematic review and meta-analysis of randomized controlled trials. Methods: In this review, conducted in April 2023, electronic databases (Web of Science, CINAHL, Embase, MEDLINE, Google Scholar) were searched to ascertain the effects of CT on IL-6 levels in stroke patients. For qualitative evaluation, ReVMan, provided by the Cochrane Group, was used, and for quantitative evaluation, a random-effects model and SMD (Standardized Mean Difference) were used. Results: Three RCTs measured IL-6 in 117 patients with stroke. The experimental group to which CT was applied showed no significant change compared to the control group.The result of analysis using the random effect model is SMD=-0.23; 95% confidence interval, -0.66 to 0.20. Conclusions: CT does not affect IL-6 levels in stroke patients. These results suggest that CT can be applied regardless of its positive or negative effect on IL-6 levels in stroke patients.

• 디지털융복합연구
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• 제11권8호
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• pp.41-52
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• 2013

도시형생활주택은 1~2인 가구의 주거 안정을 목적으로 규정을 완화한 새로운 주거형태의 주택이다. 본 연구에서는 도시형생활주택의 거주 후 평가(POE;Post Occupancy Evaluation)를 비교 실시하고 결과를 토대로 정책적 시사점을 검토하였다. 연구대상지역은 서울의 강남, 강북의 4곳을 선정하여 총 200명을 대상으로 설문조사를 실시하였다. POE분석 결과, 교통문제, 주차공간, 경제성이 문제점으로 나타났다. 강남지역과 강북지역의 차이점은 독립표본 t-test 분석 결과 입지특성, 건물상태, 시공상태, 주택규모, 유지관리, 경제성에서 강남지역이 만족도가 높은 것으로 나타났으며, 지역간 차이는 크지 않게 나타났다. 따라서 도시형생활주택은 지역적 차이는 별반 없으며 도시형생활주택 전체적으로는 공급면적의 상향조정, 주차공간의 확보를 위한 강제조항의 도입, 설계기술의 개선이 실시되어야 한다.