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프리스트레스트 콘크리트 중공 슬래브의 변형률 기반 전단강도 분석
강준희(Kang, Joon Hee),강수민(Kang, Su-Min),엄태성(Eom, Tae-Sung) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구에서는 실험결과 ACI 및 KCI 설계코드에 의한 예측강도에 대한 시험강도의 비는 HCS의 전단강도가 설계기준에서 요구되는 구조성능을 만족한다고 볼 수 있다. 하지만 현 설계기준은 HCS의 전단강도를 과소평가되는 경향이 있어 비경제적인 설계를 초래한다고 볼 수 있다. 따라서 HCS의 전단강도를 보다 합리적으로 평가하기 위해 변형률 기반 전단강도모델을 고려하여 실험결과 예측에 사용하였다. 이는 본 연구와 기존연구의 비교를 통하여 효율성을 검증하였다. In this study, As a result of the experiment, the shear strength ratio of test strength to predicted strength by ACI and KCI design code was HCS slabs satisfy the shear strength requirement by the design codes. However, the test results also showed the the design code underestimates the shear strength of HCS slabs. For the more rational design, the strain-based shear strength model was considered to predict the shear strength of the hollow slab By compare the test results in this and exsiting study to the prediction by proposed method, the effectiveness of the proposed method was verified.
초전도 Pipelined Multi-Bit ALU에 대한 연구
김진영,고지훈,강준희,Kim, Jin-Young,Ko, Ji-Hoon,Kang, Joon-Hee 한국초전도학회 2006 Progress in superconductivity Vol.7 No.2
The Arithmetic Logic Unit (ALU) is a core element of a computer processor that performs arithmetic and logic operations on the operands in computer instruction words. We have developed and tested an RSFQ multi-bit ALU constructed with half adder unit cells. To reduce the complexity of the ALU, We used half adder unit cells. The unit cells were constructed of one half adder and three de switches. The timing problem in the complex circuits has been a very important issue. We have calculated the delay time of all components in the circuit by using Josephson circuit simulation tools of XIC, $WRspice^{TM}$, and Julia. To make the circuit work faster, we used a forward clocking scheme. This required a careful design of timing between clock and data pulses in ALU. The designed ALU had limited operation functions of OR, AND, XOR, and ADD. It had a pipeline structure. The fabricated 1-bit, 2-bit, and 4-bit ALU circuits were tested at a few kilo-hertz clock frequency as well as a few tens giga-hertz clock frequency, respectively. For high-speed tests, we used an eye-diagram technique. Our 4-bit ALU operated correctly at up to 5 GHz clock frequency.
시각장애인 의약품 정보 안내를 위한 RFID 고글 개발
김진영 ( Jin Young Kim ),강준희 ( Joon Hee Kang ) 한국센서학회 2014 센서학회지 Vol.23 No.2
Recent development of ubiquitous technology prompted its application for the blinds. In this work, we developed an RFID goggle equipped with a voice guide for the blinds who have difficulties in obtaining medication in formations. When a blind, wearing our RFID goggle, tags the RFID tag attached to a drug, the RFID goggle announces the already saved medication information. We used STM32 as MCU and MFRC523 for RFID chipset in the reader. Our miniaturized hardware supported ISO 14443A protocol, and the standardized conformance test was performed. When the blinds wear our RFID goggle, they can conveniently access to the medication in formations, and thus the drug misuse cases may decrease.
Study of the Switching Errors in an RSFQ Switch by Using a Computerized Test Setup
김세훈,백승헌,양정국,김준호,강준희,Kim, Se-Hoon,Baek, Seung-Hun,Yang, Jung-Kuk,Kim, Jun-Ho,Kang, Joon-Hee The Korean Superconductivity Society 2005 Progress in superconductivity Vol.7 No.1
The problem of fluctuation-induced digital errors in a rapid single flux quantum (RSFQ) circuit has been a very important issue. In this work, we calculated the bit error rate of an RSFQ switch used in superconductive arithmetic logic unit (ALU). RSFQ switch should have a very low error rate in the optimal bias. Theoretical estimates of the RSFQ error rate are on the order of $10^{-50}$ per bit operation. In this experiment, we prepared two identical circuits placed in parallel. Each circuit was composed of 10 Josephson transmission lines (JTLs) connected in series with an RSFQ switch placed in the middle of the 10 JTLs. We used a splitter to feed the same input signal to both circuits. The outputs of the two circuits were compared with an RSFQ exclusive OR (XOR) to measure the bit error rate of the RSFQ switch. By using a computerized bit-error-rate test setup, we measured the bit error rate of $2.18{\times}10^{-12}$ when the bias to the RSFQ switch was 0.398 mA that was quite off from the optimum bias of 0.6 mA.
김진영 ( Jin Young Kim ),강준희 ( Joon Hee Kang ) 한국센서학회 2016 센서학회지 Vol.25 No.2
In this work, we have developed a test system to examine whether the charge indicator of the plug-in hybrid electric vehicle (PHEV) works properly or not. In PHEV, the driver should charge the necessary electricity by plugging in manually and be able to know the charging status through the charge indicator conveniently located for the charging individual. Our system used the CAN bus to transmit the same commands from ECU to the indicator to test the proper operation of the indicator lights. It measured the electric current values during operation and analyzed to determine the quality of the indicators. The inspection items included the proper packaging, the electrical shorts, the LED lighting during charging, the LED lighting for charging failure, and the LED lighting when errors occur. We developed the system for the operators in the factory allowing them to approve the test results at the site. We developed the hardware, the control software, and the software to store the test results and the history of the products in the database. Serial numbers were given to the good quality products and the bar code labels were printed to trace the products afterwards. Through this work, we developed a system to inspect the electric parts in real time upon fabrication. We are planning to further improve our system to inspect the brightness of the indicator by adding the vision inspection in future.
금속 부품의 결함 판단을 위한 고유 주파수 분석 시스템 개발
이충석 ( Chung Suk Lee ),김진영 ( Jin Young Kim ),강준희 ( Joon Hee Kang ) 한국센서학회 2015 센서학회지 Vol.24 No.3
In this study, we developed a system to detect the various defects in the metallic objects using the phenomenon that the defects cause the changes of the natural resonant frequencies. Our system consists of a FFT Amp, an Auto Impact Hammer, a Hammer controller and a PC. Auto Impact Hammer creates vibrations in the metallic objects when tapped on the surface. These vibrational signals are converted to the voltage signals by an acceleration sensor attached to the metallic part surface. These analog voltage signals were fed into an ADC (analog-digital converter) and an FFT (fast fourier transform) conversion in the FFT Amp to obtain the digital data in the frequency domain. Labview graphical program was used to process the digital data from th FFT amp to display the spectrum. We compared those spectra with the standard spectrum to find the shifts in the resonant frequencies of the metal parts, and thus detecting the defects. We used PCB’s acceleration sensor and TI’s TMS320F28335 DSP (digital signal processor) to obtain the resolution of 2.93 Hz and to analyze the frequencies up to 44 kHz.
실시간 위치추적을 위한 2.45㎓ 능동형 고주파 시스템에 관한 연구
김진영(Kim Jin Young),정용섭(Jung Young Sub),강준희(Kang Joon Hee) 대한공간정보학회 2008 대한공간정보학회지 Vol.16 No.3
실시간 위치추적 (Real Time Location System ; RTLS) 시스템은 유비쿼터스 사회에서 인물, 자산, 물류제품을 실시간으로 추적하기 위해 매우 중요하다. 본 연구에서는 RTLS를 위해 능동형 RF 시스템을 개발하였고 개발된 시스템의 성능을 측정하였다. 본 시스템에서 개발한 RTLS 시스템은 3개의 능동형 리더(수신기)와 1개의 태그로 구성되었다. 개발된 능동형 소형 태그에는 동전형 배터리를 내장하였다. 태그의 소형화를 위해 내장형 PCB 안테나와 칩 안테나를 장착하여 태그의 성능을 측정하였다. 또한, RF 시스템의 제조 원가를 줄이기 위해 저가의 RF 트랜시버 CC2510 칩셋을 사용하였다. CC2510 칩셋은 능동형 태그와 능동형 리더(수신기)사이의 거리를 측정하기 위한 수신신호 강도지시기가 (Received Signal Strength Indicator ; RSSI) 내장되어있다 . The Real Time Location System (RTLS) is very important in the ubiquitous society for real time tracking of men, high price assets, and logistics products. In this work, we developed an active RF system for RTLS and tested its performance. The RTLS system developed in this work was constructed of three active readers and one active tag. The small size tag developed in this work operated with a coin type battery. To make the tag smaller, we used an internal PCB antenna and a chip antenna. We tested the performance of the tag. To reduce the manufacturing cost of our RF system, we used low price RF transceiver CC2510 chip-set. The CC2510 chip-set provided RSSI(Received Signal Strength Indicator) signal which could be used to determine the distances between an active tag and three active readers.