• Title/Summary/Keyword: development characteristic

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

  • Kim, Youngran;Hwang, Seonghwan;Lee, Yunsun
    • Journal of Korean Society of Water and Wastewater
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    • v.34 no.6
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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.

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

  • Kim, Taejoo;Yun, Chulyong;Kee, Youngjoong;Kim, Seung-Ho;Jung, Sungnam
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.2
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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.

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

  • Lee, Yong Kyu;Jeong, Kyoung Mo;Koseki, Ken'ichi
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.44 no.6
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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.

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

  • Kim, Jin-Ho;Her, Jung-Hwa;Chin, Mi-Hyung;Lim, Young-Jin;Jin, Hyun-Suk;Kim, Byeong-Koo;Lee, Seung-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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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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Development of a 6-axis Robot's Finger Force/Moment Sensor for Stably Grasping an Unknown Object (미지물체를 안전하게 잡기 위한 6축 로봇손가락 힘/모멘트센서의 개발)

  • 김갑순
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.7
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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.

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

  • Kim, Seok-Hun;Sung, Kyung
    • Journal of Advanced Navigation Technology
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    • v.12 no.2
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    • pp.109-114
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    • 2008
  • As the Ubiquitous times approach, an interest regarding a Ubiquitous sensor network to be the only during key technology is rising. Currently, The fast development which radio communication technique is creating new services from the industry sector which is various from convenient characteristic and the ease characteristic side. Specially, rise and development of the radio communication technique which is various from environment monitor ring field makes to be improved about sharp curtailment of establishment and logistics relation expense, and collection period of the data which occurs real-time from site, reliability and delivery characteristic. But continuous application and the success about the environment monitor ring field of radio communication technique will be able to trust And It is important to provide time information which is appropriate real-time.

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

  • Kim, Gab-Soon;Lee, Hun-Doo;Park, In-Chul;Son, Young-Hun
    • Proceedings of the KSME Conference
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    • 2003.04a
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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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A Study on the Development of Cu Free Friction Material of Composite Brake to Response Eco-friendly Regulation (친환경 법규 대응을 위한 복합재 브레이크의 Cu Free 마찰재 개발에 관한 연구)

  • Shim, J.H.;Lee, J.H.;Shin, U.H.;Lim, D.W.;Hyun, E.J.
    • Journal of Auto-vehicle Safety Association
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    • v.14 no.2
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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.