• Title/Summary/Keyword: 시스템형상

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A Study on the Profile Design of Sweeping Auger for the Combined Grain Drying and Storage System (일체형 곡물 건조/저장 시스템 개발을 위한 나선형 배출기구의 가변 단면 형상 설계에 관한 연구)

  • Choi, Kab-Yong;Oh, Tae-Il;Shin, Sung-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.7
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    • pp.1473-1479
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    • 2009
  • This study have been carried out as a part of R&D project to develop a low cost high efficiency combined grain drying & storage system. The design of sweeping auger must meet the various conditions : capacity and dimensions of silo, discharging capacity of auger, operation conditions of auger such as revolution and rotation and density of grains and even the first-in & first-out of grains in the system. Through the experimental observations with the apparatus which enables the direct observation of discharging behavior of grains, the limitations of the performance of existing straight type auger was observed. Generalized mathematical model for the profile of new variable section sweeping auger was obtained, which ensures the uniform descending of grains and also meets various operating conditions. The experimental results with a prototype sweeping auger showed that the mathematical model for the variable section sweeping auger was quitely correct.

Multiple-Point-Diffraction Interferometer : Error Analysis and Calibration (거친 표면 형상측정을 위한 점광원 절대간섭계의 오차해석과 시스템 변수의 보)

  • Kim, Byoung-Chang;Kim, Seung-Woo
    • Korean Journal of Optics and Photonics
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    • v.16 no.4
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    • pp.361-365
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    • 2005
  • An absolute interferometer system with multiple point-sources is devised for tile 3-D measurement of rough surface profiles. The positions of the point sources are determined to be the system parameters that influence the measurement accuracy, so they are calibrated precisely prior to performing actual measurements. For the calibration, a CCD camera composed of a two-dimensional array of photo-detectors was used. Performing optimization of the cost function constructed with phase values measured at each pixel on the CCD camera, the position coordinates of each point source is precisely determined. Measurement results after calibration performed for the warpage inspection of chip scale packages (CSPs) demonstrate that the maximum discrepancy is 9.8 mm with a standard deviation o( 1.5 mm in comparison with the test results obtained by using a Form Taly Surf instrument.

The Study of automated inspection technology using a three-dimensional reconstruction of stereo X-ray image based dual-sensor Environment (Dual-Sensor 기반 스테레오 X-선 영상의 3차원 형상복원기술을 이용한 검색 자동화를 위한 연구)

  • Hwang, Young-Gwan;Lee, Nam-Ho;Kim, Jong-Ryul
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2014.05a
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    • pp.695-698
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    • 2014
  • As most the scanning systems developed until now provide radiation scan plane images of the inspected objects, there has been a limitation in judging exactly the shape of the objects inside a logistics container exactly with only 2-D radiation image information. Two 2-dimensional radiation images which have different disparity values are acquired from a newly designed stereo image acquisition system which has one additional line sensor to the conventional system. Using a matching algorithm the 3D reconstruction process which find the correspondence between the images is progressed. In this paper, we proposed a new volume based 3D reconstruction algorithm and experimental results show the proposed new volume based reconstruction technique can provide more efficient visualization for cargo inspection. The proposed technique can be used for the development of the high speed and more efficient non-destructive auto inspection system.

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Development of a Pulse Light System for Treating Skin Pigmentation (피부의 색소치료를 위한 펄스 광 시스템의 개발)

  • Jeun, Jong-Baeg;Tack, Han-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.25 no.1
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    • pp.81-87
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    • 2021
  • In this study the skin care system was designed and tested by introducing V-IPL(Variable-Intense Pulse Light) methods that allow various skin treatments. The discharge method, a new method of switching on the flash lamp sequentially according to the lesions, was used. Pulse shape control is implemented in the system using the conventional LC variable method and the switching method control method of the switching element. As a result, the pulse width could be varied up to 1[㎛] by using a microprocessor, and by turning on the flash lamp sequentially along the lesions the depth and width, the pulse shape and pulse shape could be more diverse. We could also make long pulses of up to 1~100[ms] in various pulse width. And the special differences between the existing system and the proposed system in this study are as follow. Existing system is one pulse(pulse width : 1~40ms) and proposed system is three pulse(pulse width : 1~100ms).

Control Methodology for Acquiring Small Satellite Constellation Configurations Using Low-Thrust Propulsion (저추력 추진기를 활용한 초소형위성체계 배치형상 획득을 위한 제어 방법론)

  • Ha-Eun Kim;Sang-Il Kim;Soung-Sub Lee
    • Journal of Advanced Navigation Technology
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    • v.28 no.5
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    • pp.623-631
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    • 2024
  • Currently, the Korean military is promoting a small satellite system project to establish a command and control system that can quickly respond to various threats from all directions, not only from North Korea. In this paper, we present a nonlinear control law to acquire the geometry of a small cluster satellite deployment using a low-thrust electric propulsion system, the Hall thruster. The control law is obtained by applying the general Lyapunov's control theory and analytical solution for the on-off control of the electric thruster, and it is a technique that can effectively deploy the orbital configuration of the satellite constellation by controlling only the semi-major axis of the six elements of the orbit. In this study, the stability of the developed control law is verified and the results are analyzed for application to a very small satellite system.

Measurement of Rotor Blade Deformation and Motions using Stereo Pattern Recognition Method (SPR 기법을 이용한 회전 블레이드의 변형 및 모션 측정)

  • Park, Jae-Won;Kim, Hong-Il;Han, Jae-Hung;Kim, Do-Hyung;Song, Keun-Woong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.39 no.5
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    • pp.442-450
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    • 2011
  • A measurement system using stereo pattern recognition (SPR) method was configured to measure the rotor blade deformations and motions. An SPR-based measurement system was prepared using six stereo cameras. Through a series of experiments to evaluate the system measurement uncertainty, it was verified that the SPR system had less than 0.2mm standard uncertainty. The combined standard uncertainties for the lead-lag, flapping, and pitching motions were estimated as 0.296mm, 0.209mm, and $0.238^{\circ}$, respectively. The SPR system was installed at a general small-scaled rotor test system at Korea Aerospace Research Institute. The blade motions and elastic deformation were successfully measured under the conditions with rotating speeds of 360rpm or 589rpm, and collective pitch angles of $0^{\circ}$, $4^{\circ}$, or $6^{\circ}$. The advantages of the SPR system was analyzed in comparison with the measurement system used in Higher Harmonic Control Aeroacoustic Rotor Test -II.

A Study on the Performance Prediction of Marine System using Approximation Model (근사모델을 이용한 해양시스템 성능예측에 관한 연구)

  • Lee, Jae-chul;Shin, Sung-chul;Lee, Soon-Sub;Kang, Dong-hoon;Lee, Jong-Hyun
    • Journal of the Korean Institute of Intelligent Systems
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    • v.26 no.4
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    • pp.286-294
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    • 2016
  • In the initial design stage, the geometry of systems needs to be optimized regarding its performance. However, performance analysis is very time-consuming. Therefore, optimization becomes difficult/impossible problems because we need to evaluate the system performance for alternative design cases. To overcome this problem, many researchers perform prediction of system performance using the approximation model. The response surface method (RSM) is typically used to predict the system performance in the various research fields, but it presents prediction errors for highly nonlinear systems. The major objective of this paper is to propose a proper prediction method for marine system problems. Case studies of marine systems (the substructure of a floating offshore wind turbine considering hydrodynamic performance and bulk carrier bottom stiffened panels considering structure performance) verify that the proposed method is applicable to performance prediction in marine systems.

A Study on Performance Improvement of Fruit Vegetables Automatic Grafting System (과채류 접목시스템 개선 연구)

  • Kang, Dong Hyeon;Lee, Si Young;Kim, Jong Koo;Park, Min Jung;Son, Jin Kwan;Yun, Sung-Wook;An, Se Woong;Jung, In Kyu
    • Journal of Bio-Environment Control
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    • v.26 no.3
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    • pp.215-220
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    • 2017
  • This study was conducted to improve the insufficiency of fruit vegetable grafting system developed by National Institute of Agricultural Sciences, Rural Development Administration. When the rotary blade cut the stem of scions and rootstocks, the grafting failure at curved cutting surfaces happened. The cutting depth of a tomato seedling by a rotated cutter was calculated 0.11 mm even when the cutting arm length and the maximum stem diameter were 50 mm and 5 mm, respectively. Mathematical analysis and high-speed photography showed that there was no problem by cutting in straight the stem of scions and rootstocks. The compression test of seedling stems to design the optimal shape of gripper showed that stems were not completely restored when they were compressed above 0.8 mm and 0.6 mm in case of rootstocks and scion, respectively. This study found that the bending angle of stem of tomato seedlings at the grafting period was 10 degree on average. The optimal gripper finger was the edge finger type which could be precisely set center point by adjusting the distance between fingers. In addition, it was found that most of seedling could be grasped without damage when the finger-to-finger distances is set to 2.5 mm for scion and 3.0 mm for rootstocks and finger are coated by 1 mm-thick flexible material.

Simulation on the shape of tuna longline gear (다랑어 연승어구의 형상에 관한 시뮬레이션)

  • 이지훈;이춘우
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.39 no.4
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    • pp.305-317
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    • 2003
  • Underwater shape and hook depth in tuna longline gear are important factors to decide fishing performance. It also should be considered that management and analysis of hooked rate data from hooked fish species and sizes, and each fishing would be used as a reference data in the future fishing. In this research, after analyzing underwater shape of tuna longline gear by current direction and speed using simulation, experiments were executed in flume tank to verify accuracy of the analysis. Also using the depth of each hook from the simulation, a database system was setup to process the data of bait and hooked fish species. The results were as follows;1. When the attack angle and the shortening rate are fixed, a decrease of the hook depth is proportion to an increase of current speed. 2. When the shortening rate and current speed are fixed, a decrease of hook depth is proportion to an increase of attack angle. 3. When the attack angle and velocity of flow are fixed, a decrease of hook depth is proportion to an increase of shortening rate 4. As a result of comparison between the underwater shape by simulation and that by model gear, the result of the simulation was very close to that of model gear within $$ {\pm}3%$$ 3% error range. 5. In this research, hooked rate database system using hook depth of simulation can analyze the species and size of fish by the parameter; bait. hook depth, so It could be helpful to manage and analyze the hooked data on the field.

CFD Analysis on the Flow Uniformity of a $CO_2$ Enrichment System (CFD를 이용한 온실 $CO_2$ 시비 시스템의 유량 균일성 해석)

  • Yim, Kyungjin;Kim, Hongjip;Lee, Sangmin;Park, Kyoung-Sub
    • Journal of Bio-Environment Control
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    • v.22 no.2
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    • pp.123-130
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    • 2013
  • $CO_2$ enrichment systems have been recently used to shorten the growth period of plants and the improvement of harvest and its quality. To accomplish these goals, manifold should be designed to supply the same amount of $CO_2$. In this study, CFD approach has been used to understand the effects of geometric parameters, such as tube and hole diameters. An optimized geometry has been derived through pipe and tube part, respectively. As a result, the deviation of flow rate less than 0.1 g/s was expected at all holes of the $CO_2$ enrichment system.