• Journal of the Korea Institute of Building Construction
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• v.20 no.5
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• pp.471-480
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• 2020

Although the domestic industrial accidents have been decreased gradually, deaths in the construction sites have been occupied 49.9 percent of the total industry and deaths from fall accident have been accounted for 59.7 percent of the construction industry. In order to prevent fall accident, various safety activities and policy have been carried out. However, the impact on the domestic construction industry was inadequate. On the other hand, in advanced countries, such as the United States, Japan, EU, and Singapore Industrial accidents have been lower than domestic industry due to safety activities, the regulations and policies appropriate for each country's situation. In this study, we compare the major points of the Industrial Safety and Health Act in developed countries with those in South Korea to reduce the number of falls, and propose a revision. As a result of conducting research, three revisions have been proposed as 1) Enhance standards for fall height, 2) Improvement of upper safety rail height on guardrail, 3) Revision and research on Horizontal Sarety bar attachment system. This study will be utilized as a basic study for the analysis of cases in advanced countries.

• Proceedings of the KAIS Fall Conference
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• 2008.11a
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• pp.326-329
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• 2008

현재 IEEE 802.11p 규격은 기존의 IEEE 802.11a 규격을 기반으로 하여 표준화가 진행되고 있다. 기존의 IEEE 802.11a 규격은 무선랜 (WLAN: Wireless Local Area Network) 규격으로서 고속으로 이동하는 차량 통신환경 즉 WAVE (Wireless Access for Vehicular Environment) 환경에 그대로 작용할 경우 수신 성능이 급격히 떨어지게 되 는 문제점이 있다. 본 논문에서는 긴 훈련 심볼 (LTS: Long Training Sequence)을 이용하는 기존의 채널 추정 기법을 기반으로 하되 WAVE 채널처럼 빠르게 변화하는 채널에 대응하기 위해 일정한 심볼 주기 마다 미드엠블 (Mid-Amble)을 삽입하는 전송구조를 제안한다. 또한, 미드엠블 사이의 심볼들의 위상과 크기를 3차원 스플라인 보간법을 적용하여 추정하는 알고리듬을 제안한다. 제안된 알고리듬의 성능실험을 위해 WAVE 채널을 모델링하였으며 이러한 채널에서 성능실험을 수행하였다. 실험결과에 의하면 제안된 알고리듬은 빠른 시변 채널에서도 매우 우수한 성능을 나타냄을 알 수 있다.

• Proceedings of the KAIS Fall Conference
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• 2006.05a
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• pp.311-315
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• 2006

"Dynamic Neural Unit"(DNU) based upon the topology of a reverberating circuit in a neuronal pool of the central nervous system. In this thesis, we present a genetic DNU-control scheme for unknown nonlinear systems. Our methodis different from those using supervised learning algorithms, such as the backpropagation (BP) algorithm, that needs training information in each step. The contributions of this thesis are the new approach to constructing neural network architecture and its trainin

• Proceedings of the KAIS Fall Conference
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• 2004.11a
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• pp.234-239
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• 2004

This paper describes preliminary results we have obtained in developing a computer vision system based on active IR illumination for real time gaze tracking for interactive graphic display. Unlike most of the existing gaze tracking techniques, which often require assuming a static head to work well and require a cumbersome calibration process fur each person, our gaze tracker can perform robust and accurate gaze estimation without calibration and under rather significant head movement. This is made possible by a new gaze calibration procedure that identifies the mapping from pupil parameters to screen coordinates using the Generalized Regression Neural Networks (GRNN). With GRNN, the mapping does not have to be an analytical function and head movement is explicitly accounted for by the gaze mapping function. Furthermore, the mapping function can generalize to other individuals not used in the training. The effectiveness of our gaze tracker is demonstrated by preliminary experiments that involve gaze-contingent interactive graphic display.

• Proceedings of the KAIS Fall Conference
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• 2004.06a
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• pp.217-220
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• 2004

'Dynamic Neural Unit'(DNU) based upon the topology of a reverberating circuit in a neuronal pool of the central nervous system. In this thesis, we present a genetic DNU-control scheme for unknown nonlinear systems. Our methodis different from those using supervised loaming algorithms, such as the backpropagation (BP) algorithm, that needs training information In each step. The contributions of this thesis are the new approach to constructing neural network architecture and its trainin.

• Journal of the Korean Society of Safety
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• v.37 no.3
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• pp.79-85
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• 2022

The annual statistics on fall fatality consistently show the dangers of working at height. The "Occupational Safety and Health Act" specifies legal restrictions on work at height using a scaffold. However, there are different classes of work at height, and some rely only on ropes. This study proposes education, training, and institutionalization of the "rope access work system." In brief, it was concluded that accurate instruction on the knot method and the setting of some standards were important. For this, the use of an integrated work chair harness equipment was suggested.

• Journal of the Korea Society of Computer and Information
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• v.24 no.10
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• pp.1-9
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• 2019

Fighter pilots are taking 'Advanced Pilot Training' courses to perform their missions perfectly even under adverse conditions. However, there are accidents that fall due to problems with the human body's equilibrium in the acceleration of flight, falling into the 'Vertigo, Spatial disorientation' phenomenon. As such, accidents that fighters fall due to spatial disorientation frequently occur not only in Korea but also abroad. In this study, we implemented the 'Vertigo' warning function in the fighter. First, we analyzed the aircraft's mission computer and the currently implemented warning functions. And we studied the coordinate system to utilize the aircraft attitude information. Based on this, we wanted to provide a visual warning to the HUD when the fighter flies over a certain time in the inverted flight position. Implementing this feature is expected to improve pilot flight safety. In addition, based on the results of this study, we propose a method to implement warning functions through linkage with other subsystems.

• Proceedings of the KAIS Fall Conference
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• 2010.11a
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• pp.159-162
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• 2010

There are some limitations to advance technology glaring and luminous Intensity uniformity known as the weak point of existing LED lamp. To improve the two weak points, there have been no special alternative methods so far. Instead, one method which is being used such as the twisting secondary lens or arbitrary structure to remove glaring and improve luminous Intensity uniformity. Based on this academic background, it is necessary to be examined on Technology of Optical System to solve the two weak points by using not complicated but simple methods. This paper will examine the angle of reflection in order to improve luminous intensity uniformity. Also, this research will present the method using lighting analysis program to verify a hypothesis. Through the analysis program, we could understand the simulation analysis method and got some problems about the analysis result. After analysis of causes through reinterpretation of problems, we have reached a conclusion that was changed according to reflectivity and the shape of aspherics by main cause which effected luminous Intensity uniformity and glaring.

• Proceedings of the KAIS Fall Conference
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• 2012.05a
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• pp.323-326
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• 2012

현재 우리나라의 경제 환경을 볼 때, 외부적으로는 석유를 비롯한 원자재 가격이 급등, 미국과 일본이 경제둔화, 거대 경제국가인 중국이 경제성장을 조정하고 있다. 국내에서는 수출증가에도 불구하고 기업들의 설비투자 부진, 실업률 상승 및 내수시장 침체 등으로 경제적 회복이 지연되고 있는 매우 어려운 상태에 직면해 있다. 이와 같이 급격하게 변화하는 경영 환경에서 생존하기 위해서는 인적자원 재개발 및 학습능력의 배양이 어느 때보다 중요하게 부각되고 있다. 인적자원의 능력을 파악하여 인원 선발이나 적재적소에 배치한다면 그 보다 더 나은 조직은 없을 것이다. 역동적 경영 환경 내에서 성공을 추구하는 각 기업은 끊임없는 변화에 적극 대응하여 새로운 변화를 창출해 나가는 인적자원의 능력배양을 기업성공의 중요한 요소로 보고 있다. 따라서 역동적 변화 속에 있는 기업은 변화에 효과적 능동적으로 대처할 수 있는 유연한 조직을 개발하여 고객만족 극대화, 종업원 만족 극대화, 인적자원 활용 극대화를 통하여 기업경쟁력 향상을 이룩할 수 있어야 한다. 이에 본 연구에서는 국내 기업 중 4조 2교대 근무 시스템을 도입하여 지식 근로자를 양성함으로써 큰 성공을 거둔 유한킴벌리의 고성과 근무 시스템의 도입부터 적용, 적용에 따른 성과까지의 전 과정을 심층 연구하여 이 시스템이 기업의 경쟁력을 향상 시키는 중요한 도구로 사용 된 수 있도록 연구 하고자 한다.

• Journal of the Korean Society of Physical Medicine
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• v.14 no.4
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• pp.103-113
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• 2019

PURPOSE: The purpose of this study was to determine if virtual reality-based exercise was effective in balance, gait, and falls efficacy in patients with Parkinson's disease (PD). METHODS: Thirty patients with PD were assigned randomly to the experimental (n=15) or control groups (n=15). The experimental group performed virtual reality-based exercise and the control group underwent conventional physical therapy for 30minutes, five times per week for four weeks. A force platform system, the Korean version of the Berg Balance Scale (K-BBS), the six-minute walking test (6MWT), and the Korean Version of the Falls Efficacy Scale (K-FES) were used to evaluate balance, gait, and falls efficacy. Wilcoxon signed-rank test and Mann-Whitney U test were used to examine the within- and between-group differences after training, respectively. RESULTS: Changes in the K-BBS score (p<.001) and fall efficacy (p<.01), following the intervention were significantly greater in the experimental group than in the control group whereas significant group difference were not observed for the anterior-posterior and mediolateral postural sway lengths. The change in the ground reaction force (p<.001) and 6MWT values (p<.05) were significantly greater after intervention in patients in the experimental group than in the control group, whereas a significant group difference was not observed for the step and stride lengths. CONCLUSION: This study indicates that virtual reality-based exercise is an effective intervention for improving balance, gait, and fall efficacy in patients with PD.