• 한국안전학회지
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• 제29권4호
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• pp.153-159
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• 2014

Low back pain is one of major issues in musculoskeletal diseases mainly caused by MMH (Manual Material Handling) tasks. In Korea, the standards of NIOSH(National Institute for Occupational Safety and Health) Lift Equations in U. S. A. have been most widely used. However, there is no standard in case the height of one feet is higher than that of another one. Moreover, since the standards are developed in U. S. A., there are many limitations for the applicability of Korean workers. In this study, MVC(Maximum Voluntary Contraction) for four postures are measured and an empirical model based on SVR(Support Vector Regression) is constructed. Constructing SVR model, PSO(Particle Swarm Optimization) is employed to investigate the optimal parameters of SVR. The results show that the performance of this empirical model is approximately accurate, even if the deviation of experimental values is large due to the individual differences. This empirical model may contribute to establish the standards of MMH tasks in Korea.

• 한국농촌건축학회논문집
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• 제7권3호
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• pp.1-8
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• 2005

Decrease in Population and graying of rural area by industrialization and urbanization are gone continuously. This makes happened various rural problems and the differential of standard of living with is arising day by day. Government is unfolding rural supporting project to solve continuously these problems. Recent Projects which are choosing not top-down process by government leading but bottom-up process through village inhabitants' participation and expert consultant get positive estimation. But those have difficulties because the support is attained only in the beginning step not continuously and inhabitants' number by graying is decreasing. The Special Economic Zone for Regional Development Policy is new access that regulation can differ according to special quality of each area depending on Localization Age. Through this transfer the competence that can mitigate or reinforce various regulations according to special quality of area in local government. So, back and maintain activation systematically so that each area could be developed specially. The purpose of The Special Economic Zone for Regional Development Policy is the activation of regional economy through development that regional specific character is. And there is characteristic that local government plans and takes the lead in all project contents, government gives regulation benefit by appointing the special economic zone and do not support finance and various tax remissions. Through investigation of such new policy, I wish to recognize what long-term plan and method could be possible to success rural activation continuously.

• 한국군사과학기술학회지
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• 제13권5호
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• pp.801-807
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• 2010

Requirements management is one of the most essential activities of systems engineering in developing successful weapon systems. Particularly it is very important to consistently manage the traceability among the user requirements, the system requirements, the development specifications and the testing plans throughout the entire life cycle of the weapon system. However, the most part of requirements-related activities has centered around the functional and performance requirements but the integrated logistics support(ILS) requirement has not properly been managed. In this regard, a special attention is needed to develop and manage the ILS requirements. To do so, the ANSI/EIA-632 standard can be referred as a starting point since the ILS requirements of the weapon system under development are specified by the enabling products whereas the functional and performance requirements are covered by the end product requirements. Specifically, we first review and model several cases of previous weapon systems development, which reveals the problem of interest. Then, under the framework of ANSI/EIA-632, we study a hierarchical model for effectively managing ILS requirements by analyzing the features of ILS requirements. Finally, the value of the proposed model is discussed through the case study of electronic warfare equipment.

• Nuclear Engineering and Technology
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• 제51권3호
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• pp.702-708
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• 2019

This paper deals with break size estimation of loss of coolant accidents (LOCA) using a nonlinear autoregressive with exogenous inputs (NARX) neural network. Previous studies used static approaches, requiring time-integrated parameters and independent firing algorithms. NARX neural network is able to directly deal with time-dependent signals for dynamic estimation of break sizes in real-time. The case studied is a LOCA in the primary system of Bushehr nuclear power plant (NPP). In this study, number of hidden layers, neurons, feedbacks, inputs, and training duration of transients are selected by performing parametric studies to determine the network architecture with minimum error. The developed NARX neural network is trained by error back propagation algorithm with different break sizes, covering 5% -100% of main coolant pipeline area. This database of LOCA scenarios is developed using RELAP5 thermal-hydraulic code. The results are satisfactory and indicate feasibility of implementing NARX neural network for break size estimation in NPPs. It is able to find a general solution for break size estimation problem in real-time, using a limited number of training data sets. This study has been performed in the framework of a research project, aiming to develop an appropriate accident management support tool for Bushehr NPP.

• Journal of Information Processing Systems
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• 제15권2호
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• pp.305-319
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• 2019

The prediction of the sum of container is very important in the field of container transport. Many influencing factors can affect the prediction results. These factors are usually composed of many variables, whose composition is often very complex. In this paper, we use gray relational analysis to set up a proper forecast index system for the prediction of the sum of containers in foreign trade. To address the issue of the low accuracy of the traditional prediction models and the problem of the difficulty of fully considering all the factors and other issues, this paper puts forward a prediction model which is combined with a back-propagation (BP) neural networks and the support vector machine (SVM). First, it gives the prediction with the data normalized by the BP neural network and generates a preliminary forecast data. Second, it employs SVM for the residual correction calculation for the results based on the preliminary data. The results of practical examples show that the overall relative error of the combined prediction model is no more than 1.5%, which is less than the relative error of the single prediction models. It is hoped that the research can provide a useful reference for the prediction of the sum of container and related studies.

• 한국응급구조학회지
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• 제26권3호
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• pp.71-91
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• 2022

Purpose: This study aimed to provide baseline data for implementing advanced life-support for 119EMTs. This is done with an in-depth examination of the emergency care experiences of the 119EMTs on-site and during transportation. Methods: Interviews were conducted with twelve 119EMTs, and the data were analyzed using the phenomenological method. Results: The 34 topics had 19 sub-components and were analyzed according to seven categories: 'A work environment where you cannot focus only on emergency care on-site and during transportation', '119EMTs struggling with manpower shortage', 'Current status of education blocking the upward standardization of 119EMT', 'Implementation of professional emergency care was held back due to the limited legal scope of 119EMT', 'Medical oversight makes it difficult to implement emergency care due to low flexibility', '119EMTs who cannot choose hospital selection and find it difficult to receive help', 'An evaluation system not reflecting reality at all that only leaves high scores'. Conclusion: This study was undertaken to implement specialized emergency care for 119EMTs; not only the necessity of reviewing the expansion of the work scope of 119EMTs but also the necessity of effective 'Medical Oversight system' reorganization raised as well.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2008년도 추계학술발표대회
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• pp.806-809
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• 2008

온칩(on-chip) 캐쉬는 외부 메모리로의 접근을 감소시키는 중요한 역할을 한다. 본 연구에서는 내장형 시스템에 맞추어 설계된 2-레벨 캐쉬 메모리 구조를 제안하고자 한다. 레벨1(L1) 캐쉬의 구성으로 작은 크기, 직접사상(direct-mapped) 그리고 바로쓰기(write-through)를 채용한다. 대조적으로 레벨2(L2) 캐쉬는 일반적인 캐쉬 크기와 집합연관(Set-associativity) 그리고 나중쓰기(write-back) 정책을 채용한다. 결과적으로 L1캐쉬는 한 사이클 이내에 접근될 수 있고 L2캐쉬는 전체 캐쉬의 미스율(global miss rate)을 낮추는데 효과적이다. 두 캐쉬 계층간 바로쓰기(write-thorough) 정책에서 오는 빈번한 L2 캐쉬 접근으로 인한 에너지 소비를 줄이기 위해 본 연구에서는 One-way 접근 기법을 제안하였다. 본 연구에서 제안한 2-레벨 캐쉬 메모리 구조는 평균적으로 26%의 성능향상과 43%의 에너지 소비 그리고 77%의 에너지-지연 곱에서 이득을 보여주었다.

• 디지털융복합연구
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• 제16권8호
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• pp.301-309
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• 2018

본 연구의 목적은 휠체어를 사용하는 뇌졸중 환자에게 허리 지지대와 궁둥 패드가 목, 몸통 각도와 가슴우리 확장에 미치는 영향을 즉각적으로 알아보고자 함이다. 15명의 뇌졸중 환자는 허리 지지대 사용, 궁둥 패드 사용, 허리 지지대와 궁둥 패드 동시 사용, 사용하지 않았을 때를 반복적으로 측정하였다. 측정은 휴대폰 카메라를 이용하여 목과 몸통 각도를 측정하였고, 가슴우리 확장은 줄자를 이용하였다. 연구 결과 허리 지지대와 궁둥 패드 동시 사용이 사용하지 않았을 때 보다 목, 몸통 각도, 아래쪽 가슴우리 확장에 유의하게 증가하였다. 본 연구를 통해 휠체어를 사용하는 뇌졸중 환자에게 허리 지지대와 궁둥 패드 동시 사용이 뇌졸중 환자의 가슴우리 확장과 목, 몸통 각도 증가에 즉각적인 영향을 미친다는 것을 알 수 있었다. 향후 연구에는 더 많은 대상자와 중재를 지속시켜 장기간의 변화를 확인할 필요가 있겠다.

• 한국전문물리치료학회지
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• 제10권3호
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• pp.29-40
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• 2003

The purpose of this study was to compare the muscle activity during a push-up on a suspension sling and a fixed support at the same level. Tests were performed on 15 male subjects. Electromyography using a surface EMG recorded the activity of the triceps, pectoralis major, and internal and external oblique muscles during each push-up. EMG activity was recorded at 0, 45, and 90 degrees of elbow flexion in the push-up position on a suspension sling or a fixed support at the same height above the floor (30 cm). The testing order was selected randomly. The subjects were asked to maintain the push-up position with straight knees, hips, and trunk for 5 seconds at each elbow angle. The mean root mean square (RMS) of EMG activity was calculated. EMG activity was normalized using the maximum voluntary isometric contractιn elicited using a manual muscle testing technique. Two-factor repeated measures analysis of variance (ANOVA) was used to compare the average RMS value of EMG activity for each condition. The EMG activity for the pectoralis major, and internal and external oblique muscles during a push-up on a sling was significantly higher than on a fixed support at all angles of elbow flexion (p<.01). There were significant differences in the EMG activity of the pectoralis major and triceps brachii muscles at difference angles of elbow flexion (p<.05). The pectoralis major muscle had the highest EMG activity at 90 degrees of elbow flexion on both the sling and fixed support. The triceps brachii muscle had the highest EMG activity at 45 degrees of elbow flexion on both the sling and fixed support. The internal and external oblique muscles had the highest EMG activity at 0 degrees of elbow flexion, although the difference with angle of flexion was not significant. These results suggest that to improve proximal and trunk stability and muscle strength, push-ups are more useful when performed on a suspension sling than On a fixed support.

• 벤처창업연구
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• 제12권1호
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• pp.15-24
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• 2017

본 연구는 2002년부터 2012년까지의 우리나라 벤처창업정책이 어떤 기조로 변화해왔는지를 살펴보고 그 성과와 한계점을 고찰하고 과제를 제언하는데 초점을 두었다. 우리나라 정부의 벤처창업 정책은 1997년에 제정된 "벤처기업 육성에 관한 특별조치법"을 계기로 시작되어 2002년부터 2004년까지는 벤처기업 옥석 가리기 등 벤처산업 건전화 정책이 주요 기조를 이루었고, 2005년부터 2006년까지는 벤처캐피탈의 역량과 투명성을 제고하는 벤처창업정책이 주요 기조였다. 그리고 2007년부터 2012년까지 기술창업활성화와 청년창업활성화의 정책 기조를 띠었다. 2002년부터 2012년까지의 한국 벤처창업정책은 IT를 중심으로 한 벤처기업의 내실 있는 성장을 촉진하는데 주안점을 두었으며, 혁신형 중소기업 육성, 1인 창조기업 지원 등 벤처창업의 하드웨어적인 인프라를 구축하고 자금을 지원하는데 역점을 두었다고 평가할 수 있다.