• Title, Summary, Keyword: instrumentation

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THE EFFECT OF EARLY CORONAL FLARING ABOUT APICAL EXTRUSION OF DEBRIS (근관의 치경부 조기 확대가 치근단 잔사 정출에 미치는 효과)

  • Kim, Min-Kyung;Min, Jeong-Beom;Hwang, Ho-Keel
    • Restorative Dentistry and Endodontics
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    • v.29 no.2
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    • pp.147-152
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    • 2004
  • The purpose of this study was to investigate the quantity of debris which was extruded apically after canal instrumentation using different types of enlarging instrument in endodontic resin models. Five groups of 9 endodontic resin models were instrumented using each different technique : hand instrumentation without early coronal flaring. hand instrumentation after early coronal flaring. and three nickel-titanium engine-driven instrumentations (Hero 642, Protaper, $K^$). Debris extruded from apical foramen during instrumentation was collected on preweighed CBC bottle, desiccated and weighted using electronic balance. The results were analyzed using Kruskal-wallis test and Mann-Whitney U rank sum test at a significance level of 0.05. The results were as follows: 1. All of instrumentation techniques produced apically extruded debris. 2. Group without early coronal flaring extruded significant more debris than groups with early coronal flaring. 3. There was no significant difference among early coronal flaring groups. The early coronal flaring is very important to reduce the amount of debris extruded apically.

Power supply development for marine environmental monitoring sensors using the IPMC (IPMC를 이용한 해양 환경 모니터링 센서용 전원 장치 개발)

  • Kang, Min-woo;Kim, Min;Choi, Myoung-hoon;Jung, Jae-hoon;Park, Won-hyun;Kim, Gwan-hyung;Byun, Ki-sik
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.136-137
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    • 2015
  • 이온성 고분자 금속 복합체(Ionic polymer metal composite, IPMC)는 전기 활성 고분자(Electro active polymer, EAP)중의 하나로 IPMC의 양 전극에 전기적인 자극을 가하면 굽힘 변형이 발생하고, 반대로 기계적인 자극이 주어지면 양 전극 사이에 전위차가 발생하여 전기를 얻을 수 있어 차세대 액추에이터와 센서로의 적용이 가능하다. 본 논문에서는 IPMC를 센서 소재로 사용하여 해양 환경 모니터링 센서에 전원을 공급하는 장치 개발을 설명하고자 한다.

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Implementation of redundant MAP system (MAP 이중화 시스템의 구현)

  • Moon, Hong-Ju;Park, Hong-Sung;Kim, Won-Cheol;Park, Jung-Woo;Ahn, Sang-Cheol;Woo, Won-Sik;Kwon, Wook-Hyun
    • Proceedings of the KIEE Conference
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    • pp.248-251
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    • 1992
  • In this paper, the RedMAP, i.e. a redundant Mini-MAP system for high reliability is proposed. Redundancy is implemented for LLC, MAC, and Physical layer of ISL-Mini -MAP. The detection of error of the network, the broadcasting of the error event, and the network change sequence are three major functions for the dualized Mini-MAP system. The abnormal operation of the network is mainly detected indirectly with the function of the TBC( token bus controller). The time delay to be required for the change of the networks must be minimized. With the RedMAP, we can achieve successful transmission only with short additional recovery time.

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Recent instrumentation system safety instrumentation and man-machine interface

  • Satake, Noboru
    • 전기의세계
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    • v.25 no.6
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    • pp.8-13
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    • 1976
  • The industrial processes have become complicated on a large scale bacause of improvement of productivity, research of efficiency, and shortage of locations to be suited for foundation of factories. Consequently, the instrumentation and control systems for operating these industrial processes have also been highly improved with the development of mass information means. In order to operate these large-sized and complicated industrial processes safely, the man-machine interface for correspondence between man and machines and the instrumentation system regarding process fault processing are playing an important role increasingly. This paper describes recent instrumentation system in the water purifying plant as an example of these industrial processes, and covers both man-machine interface and process fault processing. The annual water supply quantity and diffusion were 2, 000, 000, 000m$^{3}$ and 25.0% in 1950 inJapan, but they amounted to 12, 000, 000, 000m$^{3}$ and 86.7% in 1974, respectively. The demands of water will increase incessantly, while it becomes gradually difficult to secure water sources. Accordingly, local self-governing bodies such as municipal cooperation, towns, and villages often construct a large-scale water purifying plant at one place in common, as required, without constructing respective plants independently. It is an absolute requirement for the water purifying plant to avoid stopping water supply to fullfil its social responsibility from the viewpoints of its public utility enterprise, and also it has gradually become difficult to secure skilled operators enough to cover such water purifying plants that are additionally provided in various districts. Thus, the importance of the man-machine interface for assuring safety operation of the water purifying plant irrespective of unskillfulness of operators as well as the instrumentation system regarding process fault processing, or, safety instrumentation, is more and more increasing as the water purifying plants are on a large scale.

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A Review of Instrumentation System and Construction of Korea Highway Test Road (시험도로 건설과 계측시스템 구축)

  • 최준성;김도형;김성환
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.603-606
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    • 2000
  • The cost needed for the construction and management of highways in the whole nation is rapidly growing so the research that can decrease the cost is required. However, most of the highway specs have simply converted from those of other countries, including USA. Therefore, some of our design and construction specs were not the optimum ones based on our own situation, requiring a research under the actual traffic and environment of our nation. The use of test road develops many aspects of highway engineering. Those are evaluation of construction materials, a general overview of korea pavement design and serviceability under the actual traffic and environmental condition of the nation. It is also economical and efficient compared to the trial construction of each item in spreaded form. A test road, 7.7km long with two lanes, is being constructed on the Inner Central Expressway. In this test road, 2.7km is planned for asphalt pavement and 3.4km is planned for concrete pavement. Three test bridges and five earth retaining structures will be included in the test road. Based on the master plan, the major performance was progressing such as detailed research modules of each area, preliminary research for the future research, sensor surveys for the behavior analyses of pavements and structures with installation methods and data acquisition systems, the foundation research of Integrated Instrumentation System and the Management Plan for automated measurement. Some area(structure research division, geotechnical research division) was designed the instrumentation plan because some instrument sensors must be installed during the construction of the test road. And then the instrumentation plan of each area was enforcing because a large majority of the instrument sensors must be installed after the construction of the test road. The field surveys with material property tests and pilot instrumentation test with sensor tests was also performing in accordance with the construction in the field.

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The Stereomicroscope and SPM Study on the Marginal Change of Porcelain Crown in Various Repeated Instrumentations for Periodontal Therapy (치주처치를 위한 기구의 반복 사용시 도재관 변연부 변화에 관한 입체 및 주사탐침현미경적 연구)

  • Lee, Si-Cheol;Chung, Chin-Hyung;Yim, Seong-Bin
    • Journal of Periodontal and Implant Science
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    • v.30 no.2
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    • pp.455-472
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    • 2000
  • Instrumentation for periodontal therapy may induce marginal damage which increases plaque accumulation and result in periodontal disease. But there have not been many reports of instrumentations on the artificial crown so far. Therefore this study is conducted to evaluate the effects of various repeated instrumentations on the porcelain crown marginal portion. Of the 10 extracted periodontally diseased maxillary first premolars, were 12 proximal surface used in this study. The finishing line of the preparation was placed on the root surface below CEJ and then the crown was cast and cemented in usual manner. Every 4 surfaces of the 3 instruments-curet, ultrasonic scaler, and ultrasonic curet- is used. and four samples used in each instruments. The relevant procedures and measurements were repeated 3 times in each surfaces. Marginal gap is measured by the microscope and surface roughness, Scannig Probe Microscope. Measurements are made at 5 points in each surfaces, making 20 points in each instrument. The results evaluated statistically were as follows 1. As instrumentation was repeated, both marginal gap and roughness were increased in all group 2. In the hand curet, marginal gap was increased every instrumentation and roughness was increased after second. 3. In the ultrasonic scaler, both marginal gap and roughness were increased every instrumentation. 4. In the ultrasonic curet, marginal gap was increased after third instrumentation and roughness was increased after second. 5. Marginal gap and roughness used by the ultrasonic curet were lower than the others and no difference was seen between the hand curet and ultrasonic scaler From the results of this study, the ultrasonic curet was useful in some aspect, but careful instrumentation was needed. Furthermore it was important to minimize the instrumentation through complete periodontal therapy before setting and adequate plaque control.

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A study on the solar panel-powered Awning system (태양광패널을 이용한 Awning 시스템에 관한 연구)

  • Jeong, Jae-Hoon;Park, Won-hyeon;Lee, Dong-Heon;Choi, Myoung-Hoon;Kim, Min;Kim, Hyun-Jo;Zhao, Yun-Jae;Lee, Won-Sang;Kim, Song-Hyun;Yi, Hyeong-Gi
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.743-744
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    • 2016
  • Due to the many amenities of a modern power with solar power and green energy alternative to injury by cutting down on the number of solar energy and pollution and environmental factors. There is still much research and trying to incorporate a variety of applications. In this paper, create a daytime energy by fusing solar panels and billboards, and at night has the advantage that you can save more energy used to sign by the sign serves also and at the same time energy acts like a tent when the day by using the power usage is expected to be higher.

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An iterative learning approach to error compensation of position sensors for servo motors

  • Han, Seok-Hee;Ha, In-Joong;Ha, Tae-Kyoon;Huh, Heon;Ko, Myoung-Sam
    • 제어로봇시스템학회:학술대회논문집
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    • pp.534-540
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    • 1993
  • In this paper, we present an iterative learning method of compensating for position sensor error. The previously known compensation algrithms need a special perfect position sensor or a priori information about error sources, while ours does not. To our best knowledge, any iterative learning approach has not been taken for sensor error compensation. Furthermore, our iterative learning algorithm does not have the drawbacks of the existing iterative learning control theories. To be more specific, our algorithm learns a uncertain function inself rather than its special time-trajectory and does not request the derivatives of measurement signals. Moreover, it does not require the learning system to start with the same initial condition for all iterations. To illuminate the generality and practical use of our algorithm, we give the rigorous proof for its convergence and some experimental results.

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Development of the Control System for the Motor-Driven Electromechanical Total Artificial Hearta

  • Kim, Hee-Chan;Lee, Sang-Hun;Kim, Jong-Won-;Kim, Jin-Tae-;Min, Byoung-Goo
    • 제어로봇시스템학회:학술대회논문집
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    • pp.858-863
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    • 1988
  • A micro-processor based control system for a brushless DC motor used in the motor-driven electromechanical total artificial heart was developed. Functionally, the control system is composed of two parts. The first part is the velocity and position controller to assure that the motor follows a predetermined optimal velocity profile with minimal energy consumption, and to guarantee the full stroke length. This part also utilize the passive adaptive control method to be robust against the load disturbance, system parameter variation, and uncertainty which is the environment of artificial heart system. The pump output control is the second part, and this part provides the required responses of the artificial heart to the time-varying physiologic demands. The basic requirements of these responses are preload sensitivity, afterload insensitivity, and the balanced ventricular outputs. The performance and reliability of this control system was evaluated through a series of mock circulation tests and animal implantation, and the results are very encouraging.

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