• Title/Summary/Keyword: operating module

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Development of Multi-dimensional Flatbed Printer using Head Encoder and Trigger Control (Head Encoder와 Trigger 제어를 이용한 다입체 평판 프린터 개발)

  • Kim, Bong-Hyun
    • Journal of Convergence for Information Technology
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    • v.10 no.10
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    • pp.47-52
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    • 2020
  • The general flatbed printer system is composed of a PC and a dedicated S/W, which is inconvenient to use. In the end, there is a need for a technology that can easily and conveniently use various types of printing through simplification, smartization, etc. of a flatbed printer system configuration. That is, there is an increasing demand for multi-dimensional printer capable of printing on various types of materials with one printer and capable of printing various types of products. Therefore, in this paper, we developed a flatbed printer system capable of multi-dimensional printing using Head Encoder/Trigger control. To this end, we developed a flatbed printer that connects the internal module of the flatbed printer with an input type detection sensor and controls all operating states by the head encoder and head trigger signals of the printer through separate main controllers. Through this, the development and diffusion of IoT technology will expand the printer control of the smart environment to the developed form throughout the industry. It is expected to contribute to the development of the 3D printing industry in the future.

Transmembrane Pressure of the Sinusoidal Flux Continuous Operation Mode for the Submerged Flat-sheet Membrane Bioreactor in Coagulant Dosage (침지식 평막 MBR 내 응집제 투여에 따른 사인파형 연속투과 운전 방식의 막간차압)

  • Won, In Hye;Kim, Dae Chun;Chung, Kun Yong
    • Membrane Journal
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    • v.25 no.1
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    • pp.7-14
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    • 2015
  • In this study transmembrane pressure (TMP) was measured with respect to operational time in order to estimate fouling of the submerged membrane in the membrane bioreactor(MBR). The microfiltration flat sheet module which has $0.02m^2$ of effective area and $0.15{\mu}m$ nominal pore size was submerged in the activated sludge solution of MLSS 5,000 mg/L. The permeate experiments were carried out simultaneously to compare TMP of the run/stop (R/S) with that of the sinusoidal flux continuous operation (SFCO). TMP for SFCO mode was up to 93% lower than that of R/S mode, and the effect of TMP drop reduced as permeate flux increased. Also, TMP of the SCFO mode was maintained below 40% of the limited operating TMP 55 kPa until the permeate operational time extended to longer than 5 times for the case as the coagulant $FeCl_3$ was dosed into the activated sludge solution with 500 mg/L concentration.

Development and Evaluation of Smart Secondary Controls Using iPad for People with Hemiplegic Disabilities

  • Song, Jeongheon;Kim, Yongchul
    • Journal of the Ergonomics Society of Korea
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    • v.34 no.2
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    • pp.85-101
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    • 2015
  • Objective: The purpose of this study was to develop and evaluate smart secondary controls using iPad for the drivers with physical disabilities in the driving simulator. Background: The physically disabled drivers face problems in the operation of secondary control devices that accept a control input from a driver for the purpose of operating the subsystems of a motor vehicle. Many of conventional secondary controls consist of small knobs or switches that physically disabled drivers have difficulties in grasping, pulling or twisting. Therefore, their use while driving might increase distraction and workload because of longer operation time. Method: We examined the operation time of conventional and smart secondary controls, such as hazard warning, turn signal, window, windshield wiper, headlights, automatic transmission and horn. The hardware of smart secondary control system was composed of iPad, wireless router, digital input/output module and relay switch. We used the STISim Drive3 software for driving test, customized Labview and Xcode programs for interface control of smart secondary system. Nine subjects were involved in the study for measuring operation time of secondary controls. Results: When the driver was in the stationary condition, the average operation time of smart secondary devices decreased 32.5% in the normal subjects (p <0.01), 47.4% in the subjects with left hemiplegic disabilities (p <0.01) and 38.8% in the subjects with right hemiplegic disabilities (p <0.01) compared with conventional secondary devices. When the driver was driving for the test in the simulator, the average operation time of smart secondary devices decreased 36.1% in the normal subjects (p <0.01), 41.7% in the subjects with left hemiplegic disabilities (p <0.01) and 34.1% in the subjects with right hemiplegic disabilities (p <0.01) compared with conventional secondary devices. Conclusion: The smart secondary devices using iPad for people with hemiplegic disabilities showed significant reduction of operation time compared with conventional secondary controls. Application: This study can be used to design secondary controls for adaptive vehicles and to improve the quality of life of the people with disabilities.

Multi-physics analysis for the design and development of micro-thermoelectric coolers

  • Han, Seung-Woo;Hasan, MD Anwarul;Kim, Jung-Yup;Lee, Hyun-Woo;Lee, Kong-Hoon;Kim, Oo-Joong
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.139-144
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    • 2005
  • A rigorous research is underway in our team, for the design and development of high figure of merits (ZT= 1.5${\sim}$2.0) micro-thermoelectric coolers. This paper discusses the fabrication process that we are using for developing the $Sb_2Te_3-Bi_2Te_3$ micro-thermoelectric cooling modules. It describes how to obtain the mechanical properties of the thin film TEC elements and reports the results of an equation-based multiphysics modeling of the micro-TEC modules. In this study the thermoelectric thin films were deposited on Si substrates using co-sputtering method. The physical mechanical properties of the prepared films were measured by nanoindentation testing method while the thermal and electrical properties required for modeling were obtained from existing literature. A finite element model was developed using an equation-based multiphysics modeling by the commercial finite element code FEMLAB. The model was solved for different operating conditions. The temperature and the stress distributions in the P and N elements of the TEC as well as in the metal connector were obtained. The temperature distributions of the system obtained from simulation results showed good agreement with the analytical results existing in literature. In addition, it was found that the maximum stress in the system occurs at the bonding part of the TEC i.e. between the metal connectors and TE elements of the module.

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Preparation of PVDF Hollow Fiber Membrane and Absorption of SO2 from Flue Gas Using Bench Scale Gas-Liquid Contactor (PVDF 중공사막 제조 및 벤치규모 기-액 접촉기를 이용한 SO2 흡수특성)

  • Park, Hyun-Hee;Jo, Hang-Dae;Kim, In-Won;Lee, Hyung-Keun
    • Korean Chemical Engineering Research
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    • v.46 no.3
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    • pp.521-528
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    • 2008
  • The micro-porous asymmetric PVDF hollow fiber membranes for gas-liquid contactor were prepared by the dry-jet wet phase inversion process and the characteristics of hollow fiber membranes were evaluated by the gas permeation method and scanning electron microscope. The chemical absorbent for removal of $SO_2$ gas was sodium hydroxide at bench scale hollow fiber membrane contactor. The experiments were performed in a counter-current mode of operation with gas in the shell side and liquid in the fiber lumen of the module to examine the effect of various operating variables such as concentration of absorbent, gas flow rate, L/G ratio and concentration of inlet $SO_2$ gas on the $SO_2$ removal efficiency using PVDF hollow fiber membrane contactor. Membrane mass transfer coefficient($k_m$) was calculated by mathematical modeling. The volumetric overall mass transfer coefficient increased with increasing the concentration of absorbent and L/G ratio. The increase of the absorbent concentration and L/G ratio not only provides more sufficient alkalinity but also decreases liquid phase resistance. The volumetric overall mass transfer coefficient increased with increasing gas flow rate due to decreasing the gas phase resistance.

A Development of the High-Performance Signal Processor for the Compact Millimeter Wave Radar (소형 밀리미터파 레이더를 위한 고성능 신호처리기 개발)

  • Choi, Jin-Kyu;Ryu, Han-Chun;Park, Seung-Wook;Kim, Ji-Hyun;Kwon, Jun-Beom
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.17 no.6
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    • pp.161-167
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    • 2017
  • Recently, small radar has been reduced in size and power consumption to cope with various operating environments. It also requires the development of a small millimeter wave radar with high range resolution to disable the system of target with a single strike. In this paper, we design and implement a signal processor that can be used in small millimeter wave radar. The signal processor for the small millmeter wave radar is designed with a digital IF(Intermediate Frequency) receiver and DFT(Discrete Fourier Transform) module capable of real time FFT operation for miniaturization and low power consumption. Also it was to leverage the FPGA(Field Programmable Gate Array) and DAC(Digital Analog Converter) as a means for correcting the distortion of signals that can occur in the receive path of the small millimeter wave radar to create a RF signal that is used by the system. Finally, we verified the signal processor presented through performance test

A Study on Implementation for Wireless Gas Sensor Data Transmission Platform using ARM11 and Linux (ARM11 과 Linux 기반의 무선 가스 센서 데이터 전송용 플랫폼 구현)

  • Sun, Hee-Gab;Kim, Young-Kil
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.5
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    • pp.1022-1029
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    • 2009
  • What Ubiquitous means "being or existing anywhere, anytime"in Latin, which is, in other words, the users are able to access the network no matter where they are, what kind of network or computer terminals they use. This paper focuses on the implementation of hardware system. The first part of the sytem is the sensor node which transmits the sensor data from node to ARM11 platform through the Zigbee network wirelessly. The other part of the system is the ARM11 platform which receives and displays the sensor data. ARM11 platform is sink node. The ARM11 platform is based on ARM11 architecture and ported with Linux OS. Qtopia is used as Window Manager in order to make applications. The highly efficient ARM11 processor, S3C6400 MPC is the main part of the ARM11 platform.

A Study on Improvement Methods for Encrytion and Authentication in Batt le Field Management System(C4I) (전장관리체계(C4I)에서의 암호 및 인증방법 개선 방안에 관한연구)

  • Lee, Won Man;Koo, Woo Kwon;Park, Tae Hyeong;Lee, Dong Hoon
    • Convergence Security Journal
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    • v.12 no.6
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    • pp.39-50
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    • 2012
  • Battlefield management systems are operated by the Public Key Infrastructure (PKI) and cryptographic equipment is distributed through the personal delivery to the enemy has deodorizing prone to structure. In addition, Per person each battlefield management system (C4I) encryption key operate and authentication module to manage multiple encryption so, encryption key operating is restrictions. Analysis of the problems of this public key infrastructure(PKI), Identity-Based Cryptosystem(IBC) and Attribute-Based Cryptosystem(ABC) to compare construct the future of encrypt ion and authentication system were studied. Authentication method for the connection between the system that supports data encryption and secure data communication, storage, and communication scheme is proposed.

Study on operating characteristics of Ferrite cores for Flat TR in high frequency (Flat TR용 페라이트 코아의 고주파 동작 특성)

  • Han, Se-Won;Cho, Han-Goo;Ryu, Dong-Uk;Choi, Kwang-Bo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07b
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    • pp.1168-1171
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    • 2003
  • In contrast to a conventional transformer, the flat transformer is made using a number of small ferrite cores. Two cores for transformer and one core for inductor, which composed one module. Many modules can be connected together to form a flat matrix transformer. This structural arrangement eliminates the single hot spot problem in conventional transformers and permits high current density pertains at high frequency. In this study, the ferrite magnetic cores of Mn-Zn system for the Flat transformer were manufactured and the electrical and magnetic characteristics of its tested. The power loss of sample FO2(Mn-Zn ferrite) sintered at $1350^{\circ}C$ was $350kW/m^3$ in test conditions of 250kHz, 200mT and $100^{\circ}C$, which showed the good power loss property in high frequency. The power loss of FO2 samples has been studied as a function of magnetic flux density and frequency. Steinmetz exponent was 2.82 at 250kHz and 2.73 at 500kHz. These results illustrated the switching of power loss mechanism in ferrite core from hysteresis losses to eddy current losses or others.

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A Design and Implementation of MINI-PACS Employing the DICOM Converter on Web Environment (웹 상에서 DICOM 변환기를 이용한 MINI-PACS 설계 및 구현)

  • Ji, Youn-Sang;Rhee, Kang-Hyeon;Chung, Il-Yong;Lee, Sung-Joo
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.38 no.4
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    • pp.39-49
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    • 2001
  • Application of information system to hospital would bring innovative improvement on efficiency of business management and provide high quality services toward patients as well as the retrenchment of operating funds. PACS(Picture Archiving and Communication System) including X-ray film that manages the medical image information effectively, has drawn considerable attention to essential structural elements to the sophisticated information system for hospital. PACS system should be connected to the network after making a form of standard medical image file from different style of image information obtained from various medical instruments. In this paper, to solve this problem, we construct Mini-PACS that converts the form of Non-DICOM file to the form of standard file by designing the DICOM converter. This system is designed to be managed under Web environment. Comparing with the existed Mini-PACSs, consisting of the client and server module, our system is designed and implemented with integration of these functions in order to be strongly combine strongly between system.

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