• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.601-610
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• 1993

With the purpose of labour reduction in tea plucking operation with portable type machine, the influence of frame angles and tea leaves weight on the grasping forces of each finger were investigated. At the measurement of the grasping force of each finger except for thumb, grip strength dynamometers were attached at the grasping position of the frame instead of handle grips. A series of measurement was carried out changing frame angles of the tea plucking machine and the weight of tea leaves. With the obtained results of the experiments , the influences of the frame angles and the weight of the tea leaves on the grasping forces of each finger were analyzed. Some reasonable suggestions for the labour reduction in the tea plucking operation with portable type machine were obtained in the aspect of normalizing the balance of the grasping force on each finger and these suggestions are expected to contribute the labour reduction of the tea plucking operation.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1603-1608
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• 2003

Multiple robotics systems with several sub-chains have a characteristic that grasp a common object with internal loading not to loose the grip. The investigation for the internal loading of a triple manipulator has been few as compared to a dual manipulator. In this paper, type of the internal loading for a triple manipulator system is investigated through analysis of the null space of the system. Several types of the internal loading are shown for general planar and spatial type triple robots, which rigidly grasp the common object. The general scheme is applied to analysis of the internal loading for the three-fingered and three-legged robots having a point contact with the grasped object.

• 한국공간구조학회:학술대회논문집
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• 한국공간구조학회 2005년도 춘계학술발표회 및 정기총회 2권1호(통권2호)
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• pp.161-166
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• 2005

In spatial structures with large spaces, one important issue in structures with large spaces is how to carry the weight of the roof. A tensegrity cable dome structure is a kind of soft structural system using the tension cable and compression column as a main element. The tensegrity cable dome is built into a variety of shape around the world but then a collapse accident is increasing. Owing to a collapse accident we must grip of the collapse mechanism to prevent an accident and construct the structure with safety and economy. In this study, I investigated the unstable characteristics of the Geiger-type and Flower-type tcnsegrity cable dome structures, which is the lightweight hybrid structures using compression and tension elements continuously, according to the difference of loading conditions.

• 로봇학회논문지
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• 제10권4호
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• pp.193-199
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• 2015

This paper dealt with a pincers-type gripper being able to grip a heavy-weighted cylindrical object having various size with itself. This gripper should be designed to seize the objects without any change of jaw shape. Grasping achieved equilibrium after the object slipped on the jaw while grasping it. To cope with this situation, we suggested the slip considered gripper design procedure based on grasping equilibrium. The obtained slip condition can provide a limit friction coefficient depending on the contact angle when initiating contact between jaw and object. Consequently, the gripping force and the required actuating force can be calculated. In order to verify the proposed slip condition, the simulations were performed using a dynamic software.

• 수산해양교육연구
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• 제26권2호
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• pp.308-315
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• 2014

The aims of this study are to analysis about surface muscle activity of lower and upper musculus erector spinae according to walkers form. The subjects of the current step is inconvenient to use a walker and five people over the age of 65 valid samples were selected as final. All the subjects were measured in three forms. Wireless EMG muscle activity is a measure of surface measurements were measured using a system, both musculus vastus lateralis, outside the erector spinae muscle, musculus biceps femoris, gastrocnemius muscle was attached to the channel electrodes. According to the results, First, gastrocnemius muscle activity showed significant differences by type of gait. Second, the muscle activity of the erector spinae muscle walking showed significant differences by type, side grip type showed the lowest muscle activity. Consequently, the present study is the efficient use of the four-wheel walker will provide the baseline data.

• 조명전기설비학회논문지
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• 제15권6호
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• pp.103-110
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• 2001

최근 오존은 그 효용성을 인정받아 다양한 분야에서 사용되고 있으며, 그 수요 또한 계속 증가하는 추세이다. 이에 다양한 종류의 오존발생기가 연구되어지고 있다. 이러한 오존발생기는 모두 고농도와 고수율을 얻는데 그 연구목표가 있다고 할 수 있으며, 그중 하나가 동축원통형 오존발생기이다. 본 논문에서는 고주파 전원을 사용하는 새로운 형태의 원통형 오존발생기를 제안하였으며, 오존발생기의 전극 간극의 변화에 따른 방전특성과 오존생성특성을 연구하였다.

• 대한의용생체공학회:의공학회지
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• 제38권1호
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• pp.32-42
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• 2017

The aim of this study was to evaluate driving performance of Healthy and disabled groups (with or without driver's license) to control steering wheel by using steering assistive devices in the driving simulator. The persons with partial loss of use of all four limbs have problems in operation of the motor vehicle because of functional loss to operate steering wheel. Therefore, if steering assistive devices for grasping the steering wheel are used to control the vehicle on the road in persons with disabilities, the disabled persons can improve mobility in their community life by driving a motor vehicle safely. Ten healthy subjects (with or w/o driver's license) and ten subjects with physical disabilities (with or w/o driver's license) were involved in this study to evaluate driving performance to operate steering wheel by using four types of steering assistive devices (Single-pin, V-grip, Palm-grip, Tri-pin) in driving simulator. STISim Drive 3 software was used to test the steering performance in four scenarios: straight road at low and high speed of vehicle (40 km/h and 80 km/h), curved road at low and high speed of vehicle (40 km/h and 80 km/h). This study used two-way ANOVA in order to compare the effects of two factors (type of steering assistive device and subject group) in the three dependent variables of driving performance (the lateral position of vehicle, standard deviation of lateral position representing the variation of the left and right movement of the vehicle and the number of line crossing). The mean values of the three dependent variables (lateral position, standard deviation of lateral position, the number of line crossing) of steering performance were statistically significantly smaller for the healthy or disabled groups with driver's license than the other groups without driver's license on the curved road at high speed of vehicle compared to low speed of vehicle.

• 한국컴퓨터정보학회논문지
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• 제26권4호
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• pp.133-142
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• 2021

본 연구의 목적은 여성노인을 대상으로 모던댄스, 아쿠아로빅, 복합운동 프로그램을 실시한 후 신체조성과 신체기능체력에 대한 변화 비교하여 여성노인에게 가장 적합한 운동이 무엇인지를 살펴보고자 실시되었다. 연구의 대상자는 J도에 거주하는 노인여성 47명을 대상으로 MDG(n=13) AEG(n=11), CEG(n=11), CG(n=12)을 무작위로 집단을 모집하여 12주간 주3회 1시간씩 운동을 실시하였다. 이 연구의 결과 통제그룹에 비해 grip strength, chair stand, arm curl, 2 minute step, 244cm up and go에서 유의한 차이를 보였으며, Back scratch는 MDG와 CEG에서만 운동 후 유의하게 감소하였으나 Chair sit and reach에서는 변화가 보이지 않았다. 본 연구결과 운동그룹 중 모던댄스(MDG)가 운동 후 가장 많은 신체기능체력이 향상된 것으로 나타났으며, 노인들에게 유연성과 관절의 가동성을 증진 시킬 수 있는 추가적인 운동프로그램이 필요하다. 또한 자신의 흥미에 맞는 운동을 자발적으로 참여하여 지속성 있게 하는 것이 중요할 것으로 생각된다.

• 대한물리치료과학회지
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• 제2권3호
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• pp.707-725
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• 1995

The hand is an integral part of normal hand functioning. The ability of the hand to grasp and manipulate objects or tools is necessary for accom-plishing many tasks of daily living. Therefore it is important to improve hand function for patient with hand impairment. The objectives of this article are to review the developmental process of hand function and to described the types of grasp, grip, pinch, and prehension. Developmental process of hand function is based on general developmental theory as Vojta, Bobath and Ayres. There are many kinds of classification of prehension, grasp, and pinch. This review include the classification by Malick, Kiel, Melvin, Sollrman & Sperling, Pedretti & Zoltan, Tyldesley & Grieve' book, Norkin & Levangie' book. This article hope to give the information for application in physical and occupational therapy practice.

• Journal of Biosystems Engineering
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• 제23권3호
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• pp.271-276
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• 1998

A gripper mechanical design using a pneumatic system was developed to successfully grip, hold, and release a seedling plug for transplanting it. The gripper comprised of two air cylinders and shovel-type fingers. The gripper can grasp and hold a seedling by sliding the two fingers attached to the two separate air-cylinders, mounted at an angle of 15$^{\circ}$ When releasing a plug, retraction of the fingers gives a seedling little attachment to the gripper. To prevent seedling from attaching to the fingers, press-plates were attached to the end of the gipper. Transplanting performance of the developed gripper was tested with cucumber seedlings at different soil moisture contents. Overall transplanting performance of developed gipper was higher than the performance of the previously developed gripper. Best transplanting result was achieved at medium level of soil moisture content.