• Title/Summary/Keyword: Program module

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Preliminary study of Korean Electro-palatography (EPG) for Articulation Treatment of Persons with Communication Disorders (의사소통장애인의 조음치료를 위한 한국형 전자구개도의 구현)

  • Woo, Seong Tak;Park, Young Bin;Oh, Da Hee;Ha, Ji-wan
    • Journal of Sensor Science and Technology
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    • v.28 no.5
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    • pp.299-304
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    • 2019
  • Recently, the development of rehabilitation medical technology has resulted in an increased interest in speech therapy equipment. In particular, research on articulation therapy for communication disorders is being actively conducted. Existing methods for the diagnosis and treatment of speech disorders have many limitations, such as traditional tactile perception tests and methods based on empirical judgment of speech therapists. Moreover, the position and tension of the tongue are key factors of speech disorders with regards to articulation. This is a very important factor in the distinction of Korean characters such as lax, fortis, and aspirated consonants. In this study, we proposed a Korean electropalatography (EPG) system to easily measure and monitor the position and tension of the tongue in articulation treatment and diagnosis. In the proposed EPG system, a sensor was fabricated using an AgCl electrode and biocompatible silicon. Furthermore, the measured signal was analyzed by implementing the bio-signal processing module and monitoring program. In particular, the bio-signal was measured by inserting it into the palatal from an experimental control group. As a result, it was confirmed that it could be applied to clinical treatment in speech therapy.

A Study on Interactive Media Experience Exhibition & Visitor's preference (인터랙티브 미디어 체험전시의 요소와 관람객 선호도에 관한 연구 -라스코전시관 공룡체험전의 사례중심으로-)

  • Kang, Jae-Shin;Lee, Young-Ju
    • Journal of Digital Convergence
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    • v.17 no.1
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    • pp.319-325
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    • 2019
  • The 'Dinosaur Experience' exhibition at the Lasko exhibition hall hosted by Gwangmyeong city is gaining popularity. The purpose of this study is to analyze the elements of experience exhibition and interactive media experience exhibition and to grasp the preference of visitors. First, the theoretical review about interactive media and experience exhibition was made through literature data. Next, based on the Strategic Experience Module, we divided the experiential factors according to experiential value. As a result of the study, it was found that the participation rate of the visitors and the experience time were longer in the program containing many experience exhibition elements. Interactive media experience exhibited by many people have more value items. But it is not enough to understand the preference of visitors by the time spent by visitors. This study suggests that interactive media can be utilized for various experience exhibition.

Comparative Study on the Characteristics of Heat Dissipation using Silicon Carbide (SiC) Powder Semiconductor Module (탄화규소(SiC) 반도체를 사용한 모듈에서의 방열 거동 해석 연구)

  • Jung, Cheong-Ha;Seo, Won;Kim, Gu-Sung
    • Journal of the Microelectronics and Packaging Society
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    • v.25 no.4
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    • pp.89-93
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    • 2018
  • Ceramic substrates applied to power modules of electric vehicles are required to have properties of high thermal conductivity, high electrical insulation, low thermal expansion coefficient and resistance to abrupt temperature change due to high power applied by driving power. Aluminum nitride and silicon nitride, which are applied to heat dissipation, are considered as materials meeting their needs. Therefore, in this paper, the properties of aluminum nitride and silicon nitride as radiator plate materials were compared through a commercial analysis program. As a result, when the process of applying heat of the same condition to aluminum nitride was implemented by simulation, the silicon nitride exhibited superior impact resistance and stress resistance due to less stress and warping. In terms of thermal conductivity, aluminum nitride has superior properties as a heat dissipation material, but silicon nitride is more dominant in terms of reliability.

Model Test on Motion Responses and Anchor Reaction Forces of an Articulated Tower-Type Buoy Structure in Waves (아티큘레이티드 타워 형태의 부이 구조물에 관한 파랑 중 운동응답 및 앵커 지지력에 관한 모형시험 연구)

  • Kwon, Yong-Ju;Nam, Bo Woo;Kim, Nam Woo;Won, Young-Uk;Park, In-Bo;Kim, Sea-Moon
    • Journal of Ocean Engineering and Technology
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    • v.33 no.3
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    • pp.214-221
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    • 2019
  • A series of model tests was performed to evaluate the survivability of an articulated tower-type buoy structure under harsh environmental conditions. The buoy structure consisted of three long pipes, a buoyancy module, and top equipment. The scale model was made of acrylic pipe and plastic with a scale ratio of 1/22. The experiments were carried out at the ocean engineering basin of KRISO. The performance of the buoy structure was investigated under waves only and under combined environmental conditions from sea state (SS) 5 to 7. A nonlinear time-domain numerical simulation was conducted using the mooring analysis program OrcaFlex. The survivability of the buoy was analyzed based on three factors: the pitch motion, submergence of the top structure, and anchor reaction force. The model test results were directly compared to the results of numerical simulations. The effects of the sea state and combined environment on the performance of the buoy structure were investigated.

Investigation of continuous and discontinuous contact cases in the contact mechanics of graded materials using analytical method and FEM

  • Yaylaci, Murat;Adiyaman, Gokhan;Oner, Erdal;Birinci, Ahmet
    • Computers and Concrete
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    • v.27 no.3
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    • pp.199-210
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    • 2021
  • The aim of this paper was to examine the continuous and discontinuous contact problems between the functionally graded (FG) layer pressed with a uniformly distributed load and homogeneous half plane using an analytical method and FEM. The FG layer is made of non-homogeneous material with an isotropic stress-strain law with exponentially varying properties. It is assumed that the contact at the FG layer-half plane interface is frictionless, and only the normal tractions can be transmitted along the contacted regions. The body force of the FG layer is considered in the study. The FG layer was positioned on the homogeneous half plane without any bonds. Thus, if the external load was smaller than a certain critical value, the contact between the FG layer and half plane would be continuous. However, when the external load exceeded the critical value, there was a separation between the FG layer and half plane on the finite region, as discontinuous contact. Therefore, there have been some steps taken in this study. Firstly, an analytical solution for continuous and discontinuous contact cases of the problem has been realized using the theory of elasticity and Fourier integral transform techniques. Then, the problem modeled and two-dimensional analysis was carried out by using ANSYS package program based on FEM. Numerical results for initial separation distance and contact stress distributions between the FG layer and homogeneous half plane for continuous contact case; the start and end points of separation and contact stress distributions between the FG layer and homogeneous half plane for discontinuous contact case were provided for various dimensionless quantities including material inhomogeneity, distributed load width, the shear module ratio and load factor for both methods. The results obtained using FEM were compared with the results found using analytical formulation. It was found that the results obtained from analytical formulation were in perfect agreement with the FEM study.

Fabrication of Solution-Based Cylindrical Microlens with High Aspect Ratio (고종횡비를 갖는 용액기반 원통형 마이크로렌즈 제조)

  • Jeon, Kyungjun;Lee, Jinyoung;Park, Jongwoon
    • Journal of the Semiconductor & Display Technology
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    • v.20 no.1
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    • pp.70-76
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    • 2021
  • A cylindrical microlens (CML) has been widely used as an optical element for organic light-emitting diodes (OLEDs), light diffusers, image sensors, 3D imaging, etc. To fabricate high-performance optoelectronic devices, the CML with high aspect ratio is demanded. In this work, we report on facile solution-based processes (i.e., slot-die and needle coatings) to fabricate the CML using poly(methyl methacrylate) (PMMA). It is found that compared with needle coating, slot-die coating provides the CML with lower aspect ratio due to the wide spread of solution along the hydrophilic head lip. Although needle coating provides the CML with high aspect ratio, it requires a high precision needle array module. To demonstrate that the aspect ratio of CML can be enhanced using slot-die coating, we have varied the molecular weight of PMMA. We can achieve the CML with higher aspect ratio using PMMA with lower molecular weight at a fixed viscosity because of the higher concentration of PMMA solute in the solution. We have also shown that the aspect ratio of CML can be further boosted by coating it repeatedly. With this scheme, we have fabricated the CML with the width of 252 ㎛ and the thickness of 5.95 ㎛ (aspect ratio=0.024). To visualize its light diffusion property, we have irradiated a laser beam to the CML and observed that the laser beam spreads widely in the vertical direction of the CML.

Impact Assessment of Agricultural Reservoir and Landuse Changes on Water Circulation in Watershed (농업용 저수지와 토지이용변화가 유역 물순환에 미치는 영향 평가)

  • Kim, Seokhyeon;Song, Jung-Hun;Hwang, Soonho;Kang, Moon Seong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.63 no.2
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    • pp.1-10
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    • 2021
  • Agricultural reservoirs have a great influence on the water circulation in the watershed. It is necessary to evaluate the impact on water circulation by the agricultural reservoir. Therefore, in this study, we simulated the agricultural watershed through linkage of Hydrological Simulation Program Fortran (HSPF) and Module-based hydrologic Analysis for Agricultural watershed (MASA) and evaluated the contribution of the agricultural reservoir to water circulation by watershed water circulation index. As a result of simulating the Idong reservoir watershed through the HSPF-MASA linkage model, the model performance during the validation period was R2 0.74 upstream, 0.78 downstream, and 0.76 reservoir water level, respectively. To evaluate the contribution of agricultural reservoirs, three scenarios (baseline, present state, and present state without reservoir) were simulated, and the water balance differences for each scenario were analyzed. In the evaluation through the agricultural water circulation rate in the watershed, it was found that the water circulation rate increased by 1.1%, and the direct flow rate decreased by 13.6 mm due to the agricultural reservoir. In the evaluation through the Budyko curve, the evaporation index increased by 0.01. Agricultural reservoirs reduce direct runoff and increase evapotranspiration, which has a positive effect on the water circulation.

Development of a Portable Vibration Analyzer for Precision Diagnosis of Plant's Rotating Equipment (발전소 회전기기 정밀진단을 위한 휴대용 진동분석기 개발)

  • Noh, Hyungho;Y, Hoseon
    • Plant Journal
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    • v.17 no.4
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    • pp.53-60
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    • 2021
  • The purpose of this study was to develop a portable vibration analyzer that is effective for acquiring and analyzing vibration data of rotating equipment of a power plant and a domestic vibration monitoring system manufacturer Nada Co., Ltd. The hardware of the developed portable vibration analyzer minimizes measurement errors by calibrating the measured values obtained through measurement uncertainty for calibration of the measuring devices in the system, and is composed of a signal processing device with high resolution through high speed data processing. The software structure implements a variety of vibration plots to execute a detailed analysis program, and applies algorithms to measure and remove noise caused by disturbances while operating a rotating machine. The developed product contributed greatly to increase the user's mobility and performance, as well as to reduce the purchase cost due to localization.

A Study on LCL Circuit for Satellite Power System Applying WBG Device (WBG 소자를 적용한 위성 전력 시스템용 LCL 회로에 관한 연구)

  • Yoo, Jeong Sang;Ahn, Tae Young;Gil, Yong Man;Kim, Hyun Bae;Park, Sung Woo;Kim, Kyu Dong
    • Journal of the Semiconductor & Display Technology
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    • v.21 no.2
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    • pp.101-106
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    • 2022
  • In this paper, WBG semiconductor such as SiC and GaN were applied as power switches for LCL circuit that can be applied to satellite power systems and the test results of the LCL circuit are reported. P-channel MOSFET and N-channel MOSFET, which were generally used in the conventional LCL circuit, were applied together to expand the utility of the test results. The design and stability evaluation were performed using a Micro Cap circuit simulation program. For the test circuit, a module using each switch was manufactured, and a total of 5 modules were manufactured and the steady state and transient state characteristics were compared. From the experimental results, the LCL circuit for power supply of the satellite power system constructed in this paper satisfied the constant current and constant voltage conditions under various operating conditions. The P-channel MOSFET showed the lowest efficiency characteristics, and the three N-channel switches of Si, SiC and GaN showed relatively high efficiency characteristics of up to 99.05% or more. In conclusion, it was verified that the on-resistor of the switch had a direct effect on the efficiency and loss characteristics.

Modeling and Simulation of a Gas Turbine Engine for Control of Mechanical Propulsion Systems (기계식 추진 시스템 제어를 위한 가스터빈 엔진 모델링 및 시뮬레이션)

  • Back, Kyeongmi;Huh, Hwanil;Ki, Jayoung
    • Journal of the Korean Society of Propulsion Engineers
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    • v.25 no.4
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    • pp.43-52
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    • 2021
  • In this study, performance modeling and simulation of a gas turbine engine, a constituent module, was performed for the integrated control of the CODOG structure, mechanical propulsion systems. The engine model used MATLAB/Simulink to facilitate integration with the host controller and other components, and was configured to enable input/output settings suitable for the system configuration and purpose. In general, engine manufacturers do not provide performance data for the engine and components. Therefore, as a modeling method for a gas turbine, a CMF method that obtains performance data by scaling the map of components was applied. Using the generated model and simulation program, steady-state and dynamic simulation analysis tests were performed, and reliability within 5% of the maximum error was secured for the final output of power.