• Title/Summary/Keyword: Scissors system

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A Study on the Facade Design Using Scissors System (시저스 시스템을 적용한 파사드 디자인에 관한 연구)

  • Kim, Seung-Deog;Jung, HyeWon
    • Journal of Korean Association for Spatial Structures
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    • v.17 no.4
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    • pp.133-140
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    • 2017
  • Recently, the interest in the smart buildings is increasing in the architecture field. Among them, a research of facade design using a transformable system that can adjust the effect of the external environment is in progress. One of a typical example of the deployable system is a Scissors system that can change shape by using the geometric conditions of a unit member. Scissors system is a high-tech structural system which can construct the deployable plan and curved space by using the SLE (Scissors-Like Element) consisted of two Bar and Pivot. If the facade is designed by applying Scissors system, it is possible to maximize the performance and aesthetic effect of the structure by using a shape change of the line member. This paper presents a study of deployable facade design applying hybrid-typed Scissors system. A new deployable pattern of facade design is developed by combining Angulated Scissors system and tessellation pattern. Applying the deployable pattern a double skin construction method which is to add an outer wall for design, it raises three dimensional effects and can maximize the artistic essence of the change in shape upon deployment.

Measurement of Engine Piston Temperature Distribution by Using Scissors-type Linkage System (가위형 링크 기구를 이용한 기관의 피스톤 온도 분포 측정)

  • 김재업;이종화;김세웅;김응서
    • Transactions of the Korean Society of Automotive Engineers
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    • v.1 no.2
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    • pp.69-76
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    • 1993
  • The program for the development of linkage system was made and the scissors-type linkage system was designed. The piston temperature distribution under steady state was measured by the linkage system and thermocouple. The effects of engine speed, coolant outlet temperature, and torque on the piston temperature were investigated.

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A Study on Stabilizing Method of Deployable Systems (전개구조시스템의 안정화 방법에 관한 연구)

  • Kim, Seung-Deog;Park, Sun-Kyeong
    • Journal of Korean Association for Spatial Structures
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    • v.14 no.1
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    • pp.93-99
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    • 2014
  • Deployable structure is a system on which the study is being actively performed in various fields including architecture field. However, There is little study which can enhance the practicality since the interpretation condition is difficult as the unstable structure in the architecture field. In this study, the Scissors system has been focused on among the Deployable structure. The structure was developed using the Scissors system and the Mock-up test was performed. Through this, the unfolding method was proposed and the practicability was surveyed through the specific design of the Test model. Also, the structure stability was reviewed through structure analysis of Mock-up test model. and stabilizing method was proposed.

Structure and Strength Analysis of Scissors Boom of Heavy Load Transporter through Finite Element Analysis (유한요소해석을 통한 중량물 이동대차 시저스붐의 구조 및 강도 해석)

  • Hyeon-Ho Lim;Chang-Min Yang;Kwon-Woong Choi;Dae-Woo Choi
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.46 no.spc
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    • pp.61-67
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    • 2023
  • Special equipment used for snow removal is only used in the winter and must be moved into storage during non-winter seasons. However, when moving heavy equipment using a forklift within a limited space, safety accidents may occur due to deformation and damage due to the worker's limited visibility and excessive loading of heavy objects. In this study, the scissors boom of the developed heavy load transporter was conducted in two cases: link structural analysis and position-based structural analysis. In detail, the link structural analysis covers four cases of stress and safety factor according to material and thickness to optimize the specifications of the material selected during development, and the structural analysis according to position covers two cases before and after the lift, when maximum stress concentration is achieved. Safety was evaluated through finite element analysis. As a result of the study, when manufacturing a scissors boom type heavy load transporter that can withstand a load of 10 tons, the link showed safety at SS400 4.5mm or higher, and reinforcement is needed in the upper and lower structures, so it is judged to be useful in applying materials according to the load.

RELATIVISTIC INTERPLAY BETWEEN ADAPTIVE MOVEMENT AND MOBILITY ON BIODIVERSITY IN THE ROCK-PAPER-SCISSORS GAME

  • PARK, JUNPYO;JANG, BONGSOO
    • Journal of the Korean Society for Industrial and Applied Mathematics
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    • v.24 no.4
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    • pp.351-362
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    • 2020
  • Adaptive behaviors are one of ubiquitous features in evolutionary dynamics of populations, and certain adaptive behaviors can be witnessed by individuals' movements which are generally affected by local environments. In this paper, by revisiting the previous work, we investigate the sensitivity of species coexistence in the system of cyclic competition where species movement can be affected by local environments. By measuring the extinction probability through Monte-Carlo simulations, we find the relativistic effect of weights of local fitness and exchange rate for adaptive movement on species biodiversity which promotes species coexistence as the relativistic effect is intensified. In addition, by means of basins of initial conditions, we also found that adaptive movement can also affect species biodiversity with respect to the choice of initial conditions. The strong adaptive movement can eventually lead the coexistence as a globally stable state in the spatially extended system regardless of mobility.

The Effects of Work Characteristics of Grapes-harvesting Tasks on the Wrist and Elbow Angles (포도 수확 작업의 작업특성에 따른 손목과 팔꿈치 각도 영향 분석)

  • Kim, Jihye;Lee, Inseok
    • Journal of the Ergonomics Society of Korea
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    • v.36 no.5
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    • pp.589-599
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    • 2017
  • Objective: The objective of this study was to measure the upper-limb motions and postures of grapes-harvesting tasks using electrical goniometers and analyze the upper-limb motions in a kinematic way to assess the risk of musculoskeletal disorders. Background: Grapes farmers are exposed to various risk factors of musculoskeletal disorders (MSDs) such as repetitive upper-limb motions, non-neutral postures, and manual handling of heavy items. The farmers have to use scissors repetitively while harvesting grapes with their being arms elevated over the shoulder height, which presumed to increase the physical workload. It has been reported that the grapes farmers feel the harvesting task as the one of the hardest work in cultivating grapes. We tried measure the wrist and elbow angles while the farmers were carrying out harvesting tasks to understand how much workload the work impose on the farmers, which can be helpful in making interventions of preventing musculosksletal disorders among grapes farmers. Method: We measured joint angles at the right wrist and elbow with a wireless measuring system with two electrical goniometers from five grape farmers. The grapes-harvesting task was classified into 6 different subtasks: 1) searching, 2) picking, 3) cleaning, 4) carrying, 6) storing, and 7) miscellaneous tasks. The subtasks were compared by mean angles, 10%, 50%, and 90% APDF values of wrist flexion/extension, ulnar/radial deviation, and elbow flexion. Results: The Kruskal-Wallis tests showed that the 10th percentiles of APDF of ulnar/radial deviation and flexion/extension of the wrist significantly differs among subtasks (p<0.05). It was found that the farmers assumed more deviated wrist postures in the ulnar direction when they picking and adjusting the grapes. The use of scissors seemed to force the farmers to severely bend their wrist in the directions of ulnar deviation and flexion. The grapes-harvesting task showed similar wrist postures and motion with poultry deboning and milking tasks. Conclusion: The grapes harvesting tasks make the farmers take ulnar deviated and extended postures in the wrist. The use of scissors makes them take more severely deviated postures in the wrist. Safety guidelines including use of ergonomic scissors can be provided to the farmers to improve their work conditions. Application: The results of this study can be used as a basic data for the development of safety guidelines for agricultural work.

An Experimental Study on the Application of Shelter Structure Using Deployable Scissors Systems (전개가능형 가위구조시스템을 이용한 쉘터구조물에의 적용성 검토에 관한 실험적 연구)

  • Lim, Ji-Sub;Choi, Sang-Soon;Jeong, Eul-Seok;Kim, Seung-Deog
    • Journal of Korean Association for Spatial Structures
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    • v.14 no.3
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    • pp.101-108
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    • 2014
  • Recently, natural disasters such as earthquake, tsunami, typhoon and tornado are increasing, and cause huge economical loses and victim. Thus, when the disaster occurs, it is important to prepare emergency evacuation shelters for fast and easy construction compared to general building system. And, deployable structures will provide a great help for such aim. Deployable structures have the great advantage of being faster and easier to erect and dismantle compared to conventional building forms. In this study, we confirm the possibility of deployment for shelter structures using scissor structure system. First, Basic model was performed to recognize the appllicability of the deployable systems of the dome-shaped structure. Second, Advanced model that more improved inner space and deployment mechanism was confirmed.

Scissors, Rocks, Cloths recognition system using Radial Basis function (Radial Basis Function 을 이용한 가위, 바위, 보 인식 시스템)

  • 윤상민;이일광;고한석
    • Proceedings of the IEEK Conference
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    • 2000.09a
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    • pp.745-748
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    • 2000
  • 본 논문은 복잡한 배경을 가지고 있는 영상에서 우리가 원하는 손의 움직임의 일부인 가위, 바위, 보를 인식함으로써 좀 더 자연스러운 인간과 컴퓨터의 상호작용(HCI, Human and Computer Interface)을 이루고자 하였다. 정규화된 RGB 색상 공간에서 정의한 피부색의 가우시안 분포를 이용하여 조명의 변화나 개인의 차이에도 효과적이고 안정적으로 손 영역을 찾아내고자 하였으며, 추출된 손 영역은 RBF 신경망을 이용하여 가위, 바위, 보로 인식되도록 하고, 다양한 pattern에 대응하는 효율적인 training방법을 사용하였다.

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Fuzzy Control of a Seat Suspension System with an MR Damper (MR댐퍼를 이용한 의자 서스펜션 시스템의 퍼지 제어)

  • Jeon, Do-Young;Kong, Kyoung-Chul
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.619-624
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    • 2004
  • This paper applies the fuzzy logic controller to a semiactive seat suspension system in order to obtain the better ride comfort in constraint of specific rattle space. The seat suspension system used for this research is a scissors-type one with the MR (Magnetic Rheological) fluid damper. Since a seat suspension system with a driver can not be exactly modeled, it is effective to control with the fuzzy logic controller. The rule was carefully tuned to effectively reduce the vibration transmitted to a driver. The on-road ride was realized on a hydraulic excitor and the result shows that the fuzzy controller has reduced the vibration of a seat suspension system compared to the continuous skyhook controller.

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Fuzzy Control of the Seat Suspension System Considering the Acceleration of a Driver's Head (머리 가속도를 고려한 의자 서스펜션의 퍼지제어)

  • Kong Kyoung-chul;Jeon Doyoung
    • Journal of Institute of Control, Robotics and Systems
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    • v.11 no.7
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    • pp.572-577
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    • 2005
  • This paper applies the fuzzy logic controller to a semiactive seat suspension system in order to obtain the better ride comfort in constraint of specific rattle space. The seat suspension system used for this research is a scissors-type one with the MR (Magneto Rheological) fluid damper. Since a seat suspension system with a driver can not be exactly modeled, it is effective to control with the fuzzy logic controller. The rule was carefully tuned to effectively reduce the vibration transmitted to a driver. The on-road ride was realized on a hydraulic excitor and the result shows that the fuzzy controller has reduced the vibration of a seat suspension system compared to the continuous skyhook controller.