• 제목/요약/키워드: Self-moving cell

검색결과 9건 처리시간 0.021초

적층 압전 작동기를 이용한 Self-moving Cell 선형모터 연구 (Study on Self-moving Cell Linear Motor Using Piezo-stack actuators)

  • 이진호;김재환;최관영
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2001년도 추계학술대회논문집 I
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    • pp.371-375
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    • 2001
  • The concept of a new linear motor that uses piezo-stack actuator is demonstrated. The working principle is far different from the conventional inchworm motor. This motor is based on the self-moving cell concept. The linear motor has three cells and each cell is constructed with one piezo-stack actuator and a shell structure. A cell train is constructed by connecting these cells and the cell train is fitted into a guide way with a proper interference. The cell train moves along the guide way, by activating each cell in succession. The moving motion of the motor is tested. Since this linear motor uses piezo-stack actuator with unified clamping cell, it can produce fast speed, high resolution and large push force.

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적층형 압전재료를 이용한 초정밀 선형 모터에 관한 연구 (Research for ultra precision linear motor by using piezo stack actuators)

  • 임장환;김재환
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2003년도 추계학술대회논문집
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    • pp.649-654
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    • 2003
  • This paper is focused on the research of the ultra precision linear motor by using piezo stack actuators. The development of linear motor which can be controlled nano or micro scale is necessary for the precision manufacturing. Self-moving-cell principle is used for the design of linear motor Self-moving-cell linear motor is consisted of three cell structures, and each cell has two shells and one piezo-stack actuator. Each cell can do clamping and moving by two shell structures. The shell structure deformation by piezo stack actuator can move the linear motor by losing the clamping between the shall and guideway. This paper presents the design, manufacturing and test of the motor.

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대변위-고정밀 위치제어를 위한 자기변형 self-moving cell 선형모터 (Magentostrictive self-moving cell linear motor for displacement control with large force and high resolution)

  • 두재균;김재환;최승복;박홍근
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2000년도 추계학술대회논문집
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    • pp.249-255
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    • 2000
  • The design and test of an magnetostrictive linear motor(MLM) that operates based on self-moving cell concept is presented. The moving cell is composed of Terfenol-D linear actuator and a ring structure, and a cell train is constructed by connecting two cells in series. Since this motor uses the stroke of Terfenol-D actuators and friction force of the cells, it can essentially produce long stroke and large force. The overall performance of the MLM was measured in terms of speed and force. The pushing force is directly related with the friction force. This work is a proof-of-concept stage and investigation is necessary for realistic application.

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Feasibility Assessment of New Hybrid Linear Motor Using Magnetostrictive Material

  • Kim, Jaehwan;Doo, Jae-Kyun;Kim, Jae-Do
    • International Journal of Precision Engineering and Manufacturing
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    • 제2권2호
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    • pp.26-30
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    • 2001
  • This paper deals with the feasibility assessment of hybrid linear motor that operates based on self-moving cell concept. The moving cell is composed of Magnetostrictive actuator and a ring structure, and a cell train is constructed by connecting two cells in series. Since this motor uses strong push force of Terfenol-D actuators and friction of the cells, it can essentially produce long stroke and large force. The overall performance of the motor was measured in terms of speed and force.

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방향성 계층적 시공간 필터에 의한 움직이는 물체의 검출 (Moving target detection by using the hierarchical spatiotemporal filters with orientation selectivity)

  • 최태완;김재창;윤태훈;남기곤
    • 전자공학회논문지B
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    • 제33B권9호
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    • pp.135-143
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    • 1996
  • In this paper, we popose a neural network that detects edges of moving objects in an image using a neural network of hierarchical spatial filter with orientation selectivity. We modify the temporal difference network by adding a self loop to each neuraon cell to reduce the problems of phantom edge detected by the neural network proposed by kwon yool et al.. The modified neural network alleviates the phantom edges of moving objects, and also can detect edges of miving objects even for the noisy input. By computer simulation with real images, the proposed neural netowrk can extract edges of different orientation efficiently and also can reduce the phantom edges of moving objects.

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Study of Optimized Condition for Bend State in Polymer Stabilized Pi-cell with Compensation Films

  • Jeong, Seung-Yeon;Shin, Hyun-Ho;Bos, Phil;Shin, Sung-Tae
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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    • pp.589-594
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    • 2003
  • The pi-cell [1] is known as one of the candidates for a fast response time and a good viewing angle characteristics due to a self-compensated configuration and can be a replaceable mode instead of the current TN mode and the IPS mode for moving picture in future. This paper shows the optimized condition to maintain bend state instead of splay state, which is mortal demerit for good optical properties in a pi-cell, by using the polymer stabilized method [2]. The good electro-optical characteristics are also obtained by optimizing the various factors, which are monomer concentration in a LC, UV intensity, curing time, curing voltage, and curing temperature, and by using retardation film. We use a scanning electron microscope to study the structures of the polymer stabilized polymer network in a pi-cell as a key to figure out why bend state is occurred.

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자가진단형 스마트 콘크리트 개발 (Development of Self-Diagnostic Smart Concrete)

  • 김화중;김이성
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2006년도 정기 학술대회 논문집
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    • pp.82-88
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    • 2006
  • In People usually think that smart materials and smart structures have not been developed until recent years. But those kinds of sensors have already been used for sensing damage in a variety of materials and structures. Two typical examples are piezoelectric materials (e.g., PZT) and electric strain gauges. Load cell is an example that utilizes the piezoelectric property to measure the change in physical quantities occurred by applied loads, while strain gauges are used to measure the deformation of compressive and tension members. The feasibility of using smart materials is realized for a monitoring technology when those sensors are used to monitor damages at inside or outsider of the structures. In this study, a fundamental study on the development of self diagnostic smart concrete using PZT, and unsaturated polyester electric resistance sensor.

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The Prison and the Sea

  • Mrazek, Jan
    • 수완나부미
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    • 제11권1호
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    • pp.7-40
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    • 2019
  • The essay reflects on the work of Adrian Lapian (1929-2011), an Indonesian scholar of archipelagic/maritime Southeast Asia and its "sea people-sea pirates-sea kings." The essay suggests that Lapian's writing mirrors navigation at sea, and the constant re-orientation and ever-changing, multiple points of view that are part of it. This is contrasted to Foucault's "panopticism" and academic desire for discipline. Taking cue from Lapian's writing and from the present author's experience of seafaring, the essay envisions Southeast Asian studies as a fluid, precarious, disorienting, even nauseating multiplicity of experiences, dialogues, and moving, unstable, and uncertain points of view; a style of learning that is less (neo)colonial, more humble, and closer to experiences in the region, than super-scholarship that imposes universalizing, panoptic standards, theories and methods (typically self-styled as "new") that reduce the particular into a specimen of the general, a cell in the Panopticon. The essay concludes with reflections on certain learning initiatives/traditions at the National University of Singapore, including seafaring voyages-experiences, encounters, and conversations that make students and scholars alike to move and see differently, to be touched, blown away, rocked, swayed, disoriented, swallowed, transformed, and feel anew their places, roots, bonds, distances, fears, blindness, powerlessness.

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장애물 인식 지능을 갖춘 자율 이동로봇의 구현 (Implementation of a Self Controlled Mobile Robot with Intelligence to Recognize Obstacles)

  • 류한성;최중경
    • 대한전자공학회논문지SP
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    • 제40권5호
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    • pp.312-321
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    • 2003
  • 본 논문은 장애물을 인식하고 회피하면서 목적지까지 자율적으로 이동할 수 있는 로봇을 구현한 논문이다. 우리는 본 논문에서 영상처리보드의 구현이라는 하드웨어적인 부분과 자율 이동로봇을 위한 영상궤환 제어라는 소프트웨어의 두 가지 결과를 나타내었다. 첫 번째 부분에서, 영상처리를 수행하는 제어보드로부터 명령을 받는 로봇을 나타내었다. 우리는 오랫동안 CCD카메라를 탑재한 자율 이동로봇에 대하여 연구해왔다. 로봇의 구성은 DSP칩을 탑재한 영상보드와 스텝모터 그리고 CCD카메라로 구성된다. 시스템 구성은 이동로봇의 영상처리 보드에서 영상을 획득하고 영상처리 알고리즘을 수행하고 로봇의 이동경로를 계산한다. 이동로봇에 탑재된 CCD카메라에서 획득한 영상 정보는 매 샘플링 시간마다 캡쳐한다. 화면에서 장애물의 유무를 판별한 후 좌 혹은 우로 회전하여 장애물을 회피하고 이동한 거리를 Feedback하는 시스템을 구현하여 초기에 지정한 목표지점가지 로봇이 갈 수 있도록 간략한 경로를 계획하여 절대좌표를 추적해 나가는 알고리즘을 구현한다. 이러한 영상을 획득하고 알고리즘을 처리하는 영상처리 보드의 구성은 DSP (TMS320VC33), ADV611, SAA7111, ADV7176A, CPLD(EPM7256ATC144), SRAM 메모리로 구성되어 있다. 두 번째 부분에서는 장애물을 인식하고 회피하기 위하여 두 가지의 영상궤환 제어 알고리즘을 나타낸다. 첫 번째 알고리즘은 필터링, 경계검출 NOR변환, 경계치 설정 등의 영상 전처리 과정을 거친 영상을 분할하는 기법이다. 여기에서는 Labeling과 Segmentation을 통한 pixel의 밀도 계산이 도입된다. 두 번째 알고리즘은 위와 같이 전처리된 영상에 웨이브렛 변환을 이용하여 수직방향(y축 성분)으로 히스토그램 분포를 20 Pixel 간격으로 스캔한다. 파형 변화에 의하여 장애물이 있는 부분의 히스토그램 분포는 거의 변동이 없이 나타난다. 이러한 특성을 분석하여 장애물이 있는 곳을 찾아내고 이것을 회피하기 위한 알고리즘을 세웠다. 본 논문은 로봇에 장착된 한 개의 CCD 카메라를 이용하여 장애물을 회피하면서 초기에 설정해둔 목적지가지 도달하기 위한 알고리즘을 제안하였으며, 영상처리 보드를 설계 및 제작하였다. 영상처리 보드는 일반적인 보드보다 빠른 속도(30frame/sec)와 해상도를 지원하며 압축 알고리즘을 탑재하고 있어서 영상을 전송하는 데에 있어서도 탁월한 성능을 보인다.