• Title, Summary, Keyword: hook design

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Study on the Computerization of Die Design for Bending Hook (후크 벤딩 금형 설계의 전산화에 관한 연구)

  • 조은정;정호승;정철우;조종래;최일동
    • Journal of the Korean Society of Marine Engineering
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    • v.26 no.4
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    • pp.450-456
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    • 2002
  • Die desig for manufacturing hooks from steel wires has been depended on empirical procedures based on trial and error method. To design die, at first the curvature and bending angle of hook are computed by using AutoCAD and developed program which is composed of Visual Basic. Then spring back should be considered because the elastic recovery of material is very important in bending process. In this study, bending analysis of elastic-plastic materials is applied to predict curvature of hook and spring back. Therefore, systematic procedure of die design for bending hook is achieved to consider elastic recovery in terms of hook shapes. Experimental results are good agreement with calculated results.

Multi-criteria shape design of crane-hook taking account of estimated load condition

  • Muromaki, Takao;Hanahara, Kazuyuki;Tada, Yukio
    • Structural Engineering and Mechanics
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    • v.51 no.5
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    • pp.707-725
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    • 2014
  • In order to improve the crane-hook's performance and service life, we formulate a multi-criteria shape design problem considering practical conditions. The structural weight, the displacement at specified points and the induced matrix norm of stiffness matrix are adopted as the evaluation items to be minimized. The heights and widths of cross-section are chosen as the design variables. The design variables are expressed in terms of shape functions based on the Gaussian function. For this multi-objective optimization problem with three items, we utilize a multi-objective evolutionary algorithm, that is, the multi-objective Particle Swarm Optimization (MOPSO). As a common feature of obtained solutions, the side views are tapered shapes similar to those of actual crane-hook designs. The evaluation item values of the obtained designs demonstrate importance of the present optimization as well as the feasibility of the proposed optimal design approach.

Hook Type Wearable Device Based on User Discomfort (불편도를 고려한 귀걸이 형 웨어러블 디바이스 가이드라인 개발)

  • Kim, Jinyoung;Ban, Kimin;Im, Youngjae;Jung, Eui S.
    • Journal of the Ergonomics Society of Korea
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    • v.36 no.6
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    • pp.765-776
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    • 2017
  • Objective: This study aims to discover Priority of Hook type Wearable Device's PUI variabels and derive Hook related variables' specification by conducting objective measure. Background: With rapid increasing interest of Health-care Services and ICT technology, the research of Wearable Devices for Sport are becoming main concern. However, Most research of wearable devices are conducted in Economic aspects. And, Hook Type Wearable devices are stay in close to ears but there is not enough studies which are concerning ear characteristic. We need research of discover priority between Hook type wearable device's PUI variables and PUI Guideline which lower discomfort. Method: First, in 1st research, Research of market's Hook type Wearable Devices' PUI Specification. Next, Derive PUI variables and Prototypes with Orthogonal Design. And conduct a discomfort test with dynamic task. Second, in 2nd research, Derive Hook related PUI variables and Prototypes with Full Factorial Design. Conduct a discomfort test with dynamic task. Results: The PUI variables' priority is revealed as Padwidth, Outerwidth, Innerwidth, Upperlength, Lowerwidth, Lowerlength, Paddepth. And PUI variable's which are revealed lowest discomfort are 28mm width, 34mm Upperlength and 3 R value. Conclusion: This study evaluates the discomfort in Dynamic Task that affects the feel of Dynamic environment. Based on study results, a guideline for Hook type Wearable Devices is 28mm Width, 34mm Upperlength and 3 R value. Application: This study is expected to be used as basic data for designing Wearable Devices, as well as Hardware in the industries which are related to ear.

A Study on Adopting Active Suspension Control in Sky Hook System (스카이훅 시스템에의 능동 서스펜션 제어 이론 적용에 관한 연구)

  • Park Jung-Hyen;Jang Seung-Jae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.5
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    • pp.950-955
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    • 2006
  • This paper prosed modelling and design method in suspension system sesign to analyze sky hook damper system by adopting active suspension control theory. Recent in the field of suspension system design it is general to adopt active control scheme for stiffness and damping, and connection with other vehicle stability control equipment is also intricate, it is required for control system scheme to design more robust, higher response and precision control equipment. It is hon that sky hook suspension system is better than passive spring-damper system in designing suspension equipment. We analyze location of damper in sky hook system and its motion equation then design robust control system. Numerical example is shown for validity of robust control system design in active sky hook suspension system.

A Study on Behaviour of Giant Pacific Octopus, Parotopus dofleini to Single Line Hook for Hook Design (외줄낚시에 대한 대문어의 행동과 낚시형상 설계)

  • Park, Seong-Wook;Lee, Jeong-Woo;Yang, Yong-Su;Seo, Du-Ok
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.40 no.1
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    • pp.1-8
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    • 2004
  • The single line hook fishery for giant pacific octopus, Parotopus dofleini is one of the important in coastal Kangwon-do of Korea, where was caught an average of 4,000 ton during the period of 1996~2000. The fishing gear is consisted of a single buoy line, a buoy and a hook. In this study, the responses of giant pacific octopus to single line hook gear were examined in an experimental tank using a video camera in order to know hooking mechanism and improve hook. Giant pacific octopus tend to envelop the bait with their arms by rush or slowly swimming towards it. When they rush to the bait, they show much feeding behaviour as withdrawing after enveloping the bait using two arms. But when they approach with slowly swimming to bait, they show feeding behaviour as stopping after enveloping the bait using one arm. and then, the highly hooking rate appeared more often in the case of latter then former. The average feeding time on a sardine, giant pacific octopus and pork fat showed the range of 1 to 30 min, 10 to 50 min, and 50 min to over 1 hour, respectively. This indicates that it takes longer time for giant pacific octopus to eat the tough meat than the soft meat. The performance concerned with hooking showed that the 'B' type hook with a short shank was more favorable than the 'A' type hook with a long shank. However, the 'A' type hook has the advantage of easy dropping out caught octopus, compared to the 'B' type.

Product Design and Manufacture on Safety Hook and X-jog for application in Hoist and Crane (호이스트 및 크레인에 적용 가능한 안전후크와 X-jog 제품 설계 및 제작)

  • Na, Hyun-Ho;Kim, Do-Jung;Choi, Ju-Seok;Oh, Woo-Jun;Park, Jae-Woong;Lee, Chon-Ho
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.21 no.1
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    • pp.91-96
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    • 2015
  • In this study, we performed a study on prevention of the escape hoist heavy objects on the basis of the case of a disaster occurring during crane operations. A safety hook of the automatic fastening and coupling method by the conventional coupling method, the weight of the outside consisting of a combination of a safety ring structure was designed and manufactured. The main mechanism three-dimensional detail design and structural analysis confirmed the structure and stability of small strain than the allowable stress of the Safety Hook with X-jog through. Safety factor was confirmed to represent the average 1.5 to 1.2 higher than the safety factor to be considered in the general design structure. Therefore, Safety Hook and X-jog in the present study is to be operated upon structural stability is a structure attached to the hoist and crane are considered sufficient.

An Experimental Study on the Design of Dobby Hook for Repeated Loading Force (반복하중을 받는 Dobby Hook의 설계에 관한 실험적 연구)

  • Kim, Jong-Su;Lee, Gyu-Jeong;Lee, Tae-Se
    • 한국기계연구소 소보
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    • pp.115-118
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    • 1990
  • Hook of Dobby is a important part of shedding device, which must be endured the repeated loading force. In this paper, experiment on various mechanical characteristics; measurement of loading force were carried out, and compared the experimental values with results of Finite Element Method.

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A Study on Active Suspension Robust Control with Sensor and Actuator Location (센서위치를 고려한 능동 서스펜션 강인제어에 관한 연구)

  • Park Jung-Hyen;Jang Seung-Jae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.6
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    • pp.1147-1152
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    • 2006
  • This paper proposed modelling and design method in suspension system design to analyze sky hook damper system by adopting active robust control theory. Recent in the field of suspension system design it is general to adopt active control scheme for stiffness and damping, and connection with other vehicle stability control equipment is also intricate, it is required for control system scheme to design more robust, higher response and precision control equipment. It is known that sky hook suspension system is better than passive spring-damper system in designing suspension equipment. We analyze location of sensor and actuator in sky hook system and its motion equation, then design robust control system. Numerical example is shown for validity of robust control system design in active sky hook suspension system.

Effect of postural change on shoulder joint internal and external rotation range of motion in healthy adults in their 20s

  • Kim, Beom-Ryong;Yi, Dong-Hyun;Yim, Jong-Eun
    • Physical Therapy Rehabilitation Science
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    • v.8 no.3
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    • pp.152-157
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    • 2019
  • Objective: We aimed to investigate differences of range of motion in measuring shoulder internal rotation (IR) and external rotation (ER) resulting from posture change in manual scapular stabilization in prone, hook-lying, sitting, and standing positions in healthy young adults. Design: Cross-sectional study. Methods: This study included healthy young adults who agreed to participate after a thorough explanation about the study purpose and methods. A clinometer was used to measure shoulder rotation. Measurements of shoulder rotation according to postural change were performed in prone, hook-lying, sitting, and standing positions. The repeated measures analysis of variance was used to compare between-group differences in postural change. Results: The lower the posture, the greater the average value of IR angle. In contrast, the higher the posture, the greater the average value of the external rotation angle. In active and passive IR with posture change, there was difference in average value but with no statistical significance. In active and passive ER, there was a statistically significant difference between prone and sitting, prone and standing, hook-lying and sitting, hook-lying and standing, and sitting and standing position (p<0.05). Conclusions: Our findings suggest that postural change should be considered in order to increase the strength or range of motion of the internal and external rotation of the patient's shoulder joint.