• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
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• pp.159-164
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• 2001

An extensive range of pumping facilities are employed in the regional water supply system in metropolitan areas, and optimization and the systematic combination of the pump facilities have direct bearing on the stability and economy of the water supply system concerned. These systems must be able to guarantee stability, efficiency and offer high reliability. Preparation of metropolitan area regional water supply system construction project must include a basic plan which takes into account the suitability of pumping facilities to be used, the environment in which facilities will be installed, man-power requirements and basic operational and management policies. This paper contains over-all analysis of the management of metropolitan area regional water supply systems and highlights the cause of Inefficiency and energy waste and puts forward a remedial plan of action. In addition, pump/motor specification programs were developed using Visual Basic to assist selection of the same.

• 동의신경정신과학회지
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• 제8권1호
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• pp.151-165
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• 1997

The primary purpose of this study was to assess the relation of stress perception and poststroke. This study was done on 50 stroke patients in hospital. According to activities of functional impairment, they were classified into walking disturbance, motor weakness, dysphagia, or reattack etc. The stress perception test(GARS Scles) and stress response assessment shows the follwing results. 1. On the distribution in the stroke 50 patients, For the majority group were male in sex, sixty inage, middle towns people in residence. 2. On the comprehensive GARS scale scores, It marked the higest scores thirty at age, merchandise or salesman on jobs, a city in residence. There was no signigicant difference in mean GARS Scales scores between males and females group, the left hemiplegia and the Rt hemiplegia. 3. On the comprehensive GARS Scale tests, Overall glogal stressor(G8) and sickness stresor(G4) marked the highest scores of all GARS Scales. 4. On the comparative assessment of each group's stress reponse test scores, zung-bu(中腑) was showed higher scores than the other group in oriental diagnosis and hemorrage was showed higher scores than the other group in western medical diagnosis. 5. On the comprehensive assessment of each group's stress reponse test scores, aphsia(不語) marked the highest scores in another disphagia group's. It marked the highest scores in another group's that banshinbulsoo(半身不遂) as regards as hemiplegia generally. Standing disability is the higher scores than another group's walking alone or assist, and standing alone. 6. Secondary attack is the highest scores of all reattack stroke on the stress repones test. 7. Comparing and analyzing the GARS Scale total scores and GARS Scale subject fator at stroke, we found that sickness stressor and fininial stressor is showed the highest correlated to stress response fowlloing stroke. With those results, we can see that functional impairment following stroke is correlated to stress perception and reponse. In the furture studies using, we hope that the findings the study would have clinical relevance to the psychosocial adjustment and total rehabilation of stroke patients.

• 제어로봇시스템학회논문지
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• 제21권5호
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• pp.421-426
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• 2015

Need to develop human body's posture supervised robots, gave the push to researchers to think over dexterous design of exoskeleton robots. It requires to develop quantitative techniques to assess human motor function and generate the command to assist in compliance with complex human motion. Upper limb rehabilitation robots, are one of those robots. These robots are used for the rehabilitation of patients having movement disorder due to spinal or brain injuries. One aspect that must be fulfilled by these robots, is to cope with uncertainties due to different patients, without significantly degrading the performance. In this paper, we propose chattering free sliding mode control technique for this purpose. This control technique is not only able to handle matched uncertainties due to different patients but also for unmatched as well. Using this technique, patients feel active assistance as they deviate from the desired trajectory. Proposed methodology is implemented on seven degrees of freedom (DOF) upper limb rehabilitation robot. In this robot, shoulder and elbow joints are powered by electric motors while rest of the joints are kept passive. Due to these active joints, robot is able to move in sagittal plane only while abduction and adduction motion in shoulder joint is kept passive. Exoskeleton performance is evaluated experimentally by a neurologically intact subjects while varying the mass properties. Results show effectiveness of proposed control methodology for the given scenario even having 20 % uncertain parameters in system modeling.

• Journal of Biosystems Engineering
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• 제38권4호
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• pp.255-263
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• 2013

Purpose: It is not easy to drive a rice-transplanter avoiding underlapped or overlapped transplanting in paddy fields. An automated guidance system for the riding-type rice-transplanter would be necessary to operate the rice-transplanter autonomously or to assist the beginning drivers as a driving aid. Methods: A prototype of guidance system was composed of embedded computers, RTK-GPS, and a power-steering mechanism. Two Kalman filters were adopted to overcome sparse positioning data (1 Hz) from the RTK-GPS. A global Kalman filter estimated the posture of rice-transplanter every one second, and a local Kalman filter calculated the posture from every new estimation of the global Kalman filter with an interval of 200 ms. A PID controller was applied to the row-following mode control. A control method of U-turning mode was developed as well. A stepping motor with a reduction gear set was used to rotate the shaft of steering wheel. Results: Test trials for U-turning and row-following modes were done in a paddy field after some parameters have been tuned at the ground speed range of 0.3 ~ 1.2 m/s. The minimum RMS error of offset was 3.13 cm at the ground speed of 0.3 m/s while the maximum RMS error was 13.01 cm at 1.2 m/s. The offset RMS error tended to increase as the ground speed increased. The target point distance, LT also affected the system performance and PID controller parameters should be adjusted on different ground speeds. Conclusions: A target angle-based PID controller plus stationary steering angle controller made it possible for the rice-transplanter to steer autonomously by following a reference line accurately and even on U-turning mode. However, as condition in paddy fields is very complicated, the system should control the ground speed that prevents it from deviating too much due to ditch and slope.

• 재활복지공학회논문지
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• 제8권1호
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• pp.47-55
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• 2014

컴퓨터 대체접근 기기는 장애로 인해 컴퓨터 사용이 힘든 장애인들이 컴퓨터를 사용할 수 있도록 보조하는 기기이며, 이러한 기기들은 대부분 컴퓨터에 유선으로 연결하거나 S/W 프로그램을 설치하여 사용하게 된다. 대부분의 이러한 기기들은 공간적인 제한이 존재하게 되기 때문에 장애인들에게 다양하고 자유로운 컴퓨터 접근을 보장할 수 없으며 다소 불편함을 감수하게 된다. 본 논문에서는 지체장애인 및 뇌병변장애인이 언제, 어디서든 상지의 소근육 운동만으로 컴퓨터에 접근 가능한 안드로이드 기반의 컴퓨터 대체접근 마우스를 개발하였다. 개발된 마우스는 스마트기기에 사용자가 입력하는 포인트를 인식하여 이를 마우스 커서 위치로 변환하고 이를 스마트기기에 내장된 블루투스 통신을 이용하여 컴퓨터로 전달하게 된다. 또한 사용자의 피로도를 줄여 줄 수 있는 그룹스캐닝 방식을 이용하여 가벼운 터치를 이용해서 원하는 버튼을 선택하도록 함으로써 클릭, 더불클릭 및 드래그 앤 드롭 기능을 사용할 수 있도록 하였다. 개발된 컴퓨터 대체 접근 마우스는 지체 및 뇌병변장애인이 간단한 터치 한번으로 컴퓨터 사용이 가능하고, 휴대성이 좋아 시간적, 공간적 제약 없는 장애인의 컴퓨터에 접근에 이용될 것이다.

• 한국의류산업학회지
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• 제24권5호
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• pp.647-654
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• 2022

Wearable devices come in a variety of shapes and sizes in numerous fields in numerous fields and are available in various forms. They can be integrated into clothing, gloves, hats, glasses, and bags and used in healthcare, the medical field, and machine interfaces. These devices keep track individuals' biological and behavioral data to help with health communication and are often used for injury prevention. Those with hearing loss or impaired vision find it more difficult to recognize an approaching person or object; these sensing devices are particularly useful for such individuals, as they assist them with injury prevention by alerting them to the presence of people or objects in their immediate vicinity. Despite these obvious preventive benefits to developing Internet of Things based devices for the disabled, the development of these devices has been sluggish thus far. In particular, when compared with people without disabilities, people with hearing impairment have a much higher probability of averting danger when they are able to notice it in advance. However, research and development remain severely underfunded. In this study, we incorporated a wearable detection system, which uses an infrared proximity sensor, into a backpack. This system helps its users recognize when someone is approaching from behind through visual and tactile notification, even if they have difficulty hearing or seeing the objects in their surroundings. Furthermore, this backpack could help prevent accidents for all users, particularly those with visual or hearing impairments.

• 대한감각통합치료학회지
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• 제21권1호
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• pp.34-46
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• 2023

목적 : 본 연구의 목적은 장애 아동 및 청소년에게 적용한 가상현실(Virtual Reality; VR) 기반 작업치료 중재의 효과와 적용 방법에 대해서 체계적으로 분석하고자 한다. 연구방법 : 2012년 1월부터 2022년 8월까지 RISS, DBpia, KCI, Science direct, CINAHL MEDLINE에서 문헌을 검색하였다. 주요 검색용어로 '가상현실', '작업치료', '아동', '청소년', 'Virtual Reality', 'Occupational Therapy', 'Child', 'Adolescent'을 사용하였다. PRISMA의 Flowchart 4단계를 거쳐 총 16편의 문헌을 분석 대상으로 선정하였다. 결과 : 선정된 16편의 연구에서 장애 아동 및 청소년에게 사용된 VR 기반 작업치료 중재가 유의미한 효과를 보였다. 중재 대상자는 뇌성마비 유형 중 편마비 아동을 대상으로 한 연구가 가장 많았으며, 효과 측정에 사용된 평가도구는 일상생활활동, 인지, 운동기술, 사회적-상호작용기술, 시-지각 평가이었다. 중재 도구로는 Nintendo Wii와 Microsoft Kinect가 운동기술 및 일상생활 향상을 위하여 가장 많이 사용되었다. 결론 : 본 연구를 바탕으로 향후에는 장애 아동 및 청소년의 진단과 중재목적에 맞는 VR 도구 선택과 구체적인 방법의 제시를 통하여 VR중재가 임상에서 더욱 효과적으로 사용될 수 있을 것이라 기대한다.