• 제목/요약/키워드: development characteristic

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도시특성 요인의 다중선형회귀 분석을 이용한 물순환상태추정모델 개발 (Development of water circulation status estimation model by using multiple linear regression analysis of urban characteristic factors)

  • 김영란;황성환;이연선
    • 상하수도학회지
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    • 제34권6호
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    • pp.503-512
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    • 2020
  • Identifying the water circulation status is one of the indispensable processes for watershed management in an urban area. Recently, various water circulation models have been developed to simulate the water circulation, but it takes a lot of time and cost to make a water circulation model that could adapt the characteristics of the watershed. This paper aims to develop a water circulation state estimation model that could easily calculate the status of water circulation in an urban watershed by using multiple linear regression analysis. The study watershed is a watershed in Seoul that applied the impermeable area ratio in 1962 and 2000. And, It was divided into 73 watersheds in order to consider changes in water circulation status according to the urban characteristic factors. The input data of the SHER(Similar Hydrologic Element Response) model, a water circulation model, were used as data for the urban characteristic factors of each watershed. A total of seven factors were considered as urban characteristic factors. Those factors included annual precipitation, watershed area, average land-surface slope, impervious surface ratio, coefficient of saturated permeability, hydraulic gradient of groundwater surface, and length of contact line with downstream block. With significance probabilities (or p-values) of 0.05 and below, all five models showed significant results in estimating the water circulation status such as the surface runoff rate and the evapotranspiration rate. The model that was applied all seven urban characteristics factors, can calculate the most similar results such as the existing water circulation model. The water circulation estimation model developed in this study is not only useful to simply estimate the water circulation status of ungauged watersheds but can also provide data for parameter calibration and validation.

무베어링 로터 훨타워 시험을 위한 무힌지 블레이드 강성보강에 따른 동특성 연구 (Dynamic Characteristic Study of Hingeless Blade Stiffness Reinforcement for Bearingless Rotor Whirl Tower Test)

  • 김태주;윤철용;기영중;김승호;정성남
    • 한국소음진동공학회논문집
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    • 제23권2호
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    • pp.105-111
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    • 2013
  • Whirl tower test is conducted basically during helicopter rotor system development process. And for whirl tower test of rotor hub system, new design blade or existing blade which is remodeled for new rotor hub system is used. Because of simple shape and efficient aerodynamic characteristic, BO-105 helicopter blade is used for helicopter rotor hub development project widely. Originally BO-105 blade is used for hingeless hub system and blade root is used to flexure. So flap stiffness and lag stiffness at blade root area is relatively low compare with airfoil area. So, in order to apply the BO-105 blade to bearingless hub, blade root area have to be reinforced. And in this process, blade root area's section property is changed. In this paper, we suggest reinforcement method of BO-105 blade root area and study dynamic characteristic of bearingless rotor system with reinforcement BO-105 blade.

최신 화상 재료의 소개 -마이크로 캡슐 토너- (Introduction of the Advanced Imaging Materials -Micro-encapsulating Treatment of Toner-)

  • 이용규;정경모;코세키 켄이치
    • 펄프종이기술
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    • 제44권6호
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    • pp.79-86
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    • 2012
  • The aim of this general remarks is to introduce the results concerning the thermo physical, charging, developing and fusing characteristics of micro-encapsulated (MC) model toners in order to apply to the toner of electrophotographic system at the condition of a low temperature. In order to clarify the fusing mechanism of MC toner, rheological analysis of the toner was chosen. It was suggested that MC toner had a different fusing mechanism compared with non-MC toner. Some kinds of MC model toners showed a good result on adhesion test as well as cohesion test. Also, it was possible to get the good charging and development characteristic of MC toner for printing test with laser printer.

고투과율 특성을 갖는 FFS 모드의 시야각 스위칭 (Viewing angle controllable liquid crystal display using fringe-field switching mode with high aperture ratio characteristic)

  • 김진호;허정화;진미형;임영진;진현석;김병구;이승희
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 하계학술대회 논문집
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    • pp.32-33
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    • 2009
  • We propose viewing angle switchable liquid crystal display(LCD) associated with fringe-field switching (FFS) mode with high aperture ratio characteristic. This device is composed of R(red), G(green), B(blue), pixel and W(white) pixel in which R,G,B pixel shows image and white pixel for both viewing angle control and image. Conventional viewing angle controllable liquid crystal display has not transmittance because the liquid crystal only tilts up without rotates in viewing angle control region. In this paper, we suggested that the device has high transmittance characteristic because the LC directors are rotated in which viewing angle control region are generated fringe electric field.

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미지물체를 안전하게 잡기 위한 6축 로봇손가락 힘/모멘트센서의 개발 (Development of a 6-axis Robot's Finger Force/Moment Sensor for Stably Grasping an Unknown Object)

  • 김갑순
    • 한국정밀공학회지
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    • 제20권7호
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    • pp.105-113
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    • 2003
  • This paper describes the development of a 6-axis robot's finger force/moment sensor, which measures forces Fx, Fy, Fz, and moments Mx, My, Mz simultaneously, for stably grasping an unknown object. In order to safely grasp an unknown object using the robot's gripper, it should measure the force in the gripping direction and the force in the gravity direction, and perform the force control using the measured forces. Thus, the robot's gripper should be composed of 6-axis robot's finger force/moment sensor that can measure forces Fx, Fy, Fz, and moments Mx, My, Mz simultaneously. In this paper, the 6-axis robot's finger force/moment sensor for measuring forces Fx, Fy, Fz, and moments Mx, My, Mz simultaneously was newly modeled using several parallel-plate beams, designed, and fabricated. The characteristic test of made sensor was performed. and the result shows that interference errors of the developed sensor are less than 3%. Also, Robot's gripper with the 6-axis robot's finger force/moment sensor for the characteristic test of force control was manufactured, and the characteristic test for grasping an unknown object was performed using it. The fabricated gripper could grasp an unknown object stably. Thus, the developed 6-axis robot's finger force/moment sensor may be used for robot's gripper.

RISC 센서 네트워크 노드를 이용한 수질환경 분석 모니터링 시스템 (A Water Environment Monitering System using the RISC Sensor Network Node)

  • 김석훈;성경
    • 한국항행학회논문지
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    • 제12권2호
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    • pp.109-114
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    • 2008
  • 유비쿼터스 시대가 다가옴에 따라 핵심 기술 중 하나인 유비쿼터스 센서 네트워크에 대한 관심이 높아지고 있다. 현재 무선 통신 기술의 급속한 발전은 다양한 산업분야에서 편리성 및 용이성 측면에서 새로운 서비스들을 창출하고 있다. 특히, 환경 모니터링 분야에서 다양한 무선 통신 기술의 대두 및 발전은 설치 및 관련 비용의 대폭 절감뿐만 아니라 현장에서 실시간적으로 발생하는 자료의 수집주기, 신뢰성 및 전달성에 있어 획기적인 개선을 가능하게 하였다. 그러나 무선 통신 기술의 환경 모니터링 분야에 대한 지속적인 적용 및 성공은 신뢰할 수 있고 시기적절한 정보를 실시간적으로 제공 가능하느냐에 따를 것이다.

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로봇의 그리퍼 제작을 위한 6 축 로봇손가락 힘/모멘트센서의 개발 (Development of a 6-axis robot's finger force/moment sensor for making a robot's gripper)

  • 김갑순;이헌두;박인철;손영훈
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2003년도 춘계학술대회
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    • pp.758-763
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    • 2003
  • This paper describes the development of a 6-axis robot's finger force/moment sensor, which measures forces Fx, Fy, Fz, and moments Mx, My, Mz simultaneously, for making a robot's gripper. In order to safely grasp and unknown object using the robot's gripper, it should measure the force in the gripping direction and the force in the gravity direction, and perform the force control using the measured forces. Thus, the robot's gripper should be composed of 6-axis robot's finger force/moment sensor that can measure forces Fx, Fy, Fz, and moments Mx, My, Mz simultaneously. In this paper, the 6-axis robot's finger force/moment sensor for measuring forces Fx, Fy, Fz, and moments Mx, My, Mz simultaneously was newly modeled using several parallel-plate beams, designed, and fabricated. The characteristic test of made sensor was performed. Also, Robot's gripper with the 6-axis robot's finger force/moment sensor for the characteristic test of force control was manufactured, and the characteristic test for grasping an unknown object was performed using it.

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친환경 법규 대응을 위한 복합재 브레이크의 Cu Free 마찰재 개발에 관한 연구 (A Study on the Development of Cu Free Friction Material of Composite Brake to Response Eco-friendly Regulation)

  • 심재훈;이중희;신웅희;임동원;현은재
    • 자동차안전학회지
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    • 제14권2호
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    • pp.90-95
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    • 2022
  • Composite material is widely used in the automotive industries because it has excellent mechanical properties and is possible to reduce weight due to the low density. However, there is a new obstacle to meet environment regulation like Cu less or Cu free regulation for the friction material. Although it is strongly demanded, there are few research results about that unfortunately. Unless this problem is not solved properly, it is impossible to apply composite brake system to vehicle. In this paper, a new eco-friendly friction material for composite brake system is represented to respond these regulations. To do this, friction characteristics between existing low steel friction material and new eco-friendly friction material are verified to secure performances for brake system such as effect characteristic, fade characteristic and wear characteristic. And composite brake gets the equivalent or better performance compared to a low steel friction material. Finally, this result contributes to the study of major principles for the development of eco-friendly friction material in the future.