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신정호,강대성,Shin, Jung-Ho,Kang, Dae-Seong 한국융합신호처리학회 2009 융합신호처리학회 논문지 (JISPS) Vol.10 No.1
유도 전동기의 사용이 증가함에 따라 유도전동기의 고장은 산업 사회에 커다란 피해를 끼치게 되었다. 그렇기 때문에 유도 전동기의 고장을 찾아내는 것은 매우 중요한 문제로 부각되었다. 하지만 그 중에서도 문제점은 유도전동기의 고장은 종종 오랜 시간에 걸쳐 진행된다는 것이다. 그것은 빠른 진단이 매우 중요하다는 것을 뜻한다. 이에 대해 많은 연구가 진행되어 왔으며 가장 일반적으로 쓰이는 고장 진단 방법은 진동 센서를 이용한 전동기의 기계적 고장을 찾는 방법이다. 하지만 이 방법은 신뢰도가 높은 검증 방법임에도 불구하고 높은 시스템 가격과 활용의 어려움으로 인해 새로운 방법들이 시도가 되었다. 이 논문은 시스템을 기반으로 웨이블릿 변환을 이용한 유도전동기의 고장 진단 기술을 구현하는 것을 보여주며 윈도우즈 기반 C++을 이용하여 고장인지 아닌지를 결정하는 알고리즘으로 구성되어 있다. 전체 시스템은 전류 데이터 수집 보드와 PC를 이용한 신경망 알고리즘으로 실시간으로 수행 될 것이다. As increasing of using induction motors, the induction motors faults cause serious damage to the industry. Therefore to find out faults of induction motor is recognized as important problem awaiting solution. But to make matters worse, the faults of induction motors often progress through long time. It means that early diagnosis is very important. Many researches have been progressed and general method of diagnosis is using vibration sensor to diagnose fault of induction motor. However, although it is reliability technique, it demands high price and it is difficult to use. This paper presents an implementation of technique for fault diagnosis of induction motor using wavelet transform based stator current and it is composed with algorithm that decides whether fault existence or not using C++ based on windows software. The algorithm will be accomplished in real-time using current data acquisition board and PC automatically with Neural Network algorithm.
신정호,정정훈,백준기,Shin, Jeong-Ho,Jung, Jung-Hoon,Paik, Joon-Ki 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.11
We propose a spatially adaptive image interpolation algorithm, which can restore high frequency details in the original high resolution image. In order to apply the regularization approach to the interpolation procedure, we first present a two-dimensional separable image degradation model for a low resolution imaging system. According to the model, we propose a regularized spatially adaptive interpolation algorithm by using five different constraints. We also analyze convergence of the proposed algorithm, and provide some experimental results to compare the proposed algorithm with its nonadaptive version. 본 논문에서는 원영상이 가지고 있는 고주파 성분을 효율적으로 복원할 수 있는 공간 적응적 영상보간(image interpolation) 알고리듬을 제안한다. 영상이 갖고 있는 선험적 정보(a priori knowledge)를 보간 과정에 적용하기 위해서는, 우선 저해상도의 영상 시스템을 나타내는 분리 가능한(separable) 2차원 열화모델(degradation model)을 결정한다. 이렇게 결정된 열화 모델에 따라 다섯 가지의 서로 다른 제약 조건들을 사용하여 정칙화에 기반을 둔 공간 적응적 영상보간 알고리듬을 제안한다. 또한, 제안된 알고리듬의 수렴성을 분석하고, 실험 결과를 토대로 비적응적인 방법과 제안된 알고리듬의 성능을 비교한다.
직접Quenching 열간 단조용 비조질강의 기계적 성질에 미치는 Quenching온도 및 냉각속도의 영향
신정호,류영주,김병옥,고인용,이오연,Shin, Jung-Ho,Ryu, Young-Joo,Kim, Byung-Ok,Ko, In-Yong,Lee, Oh-Yeon 한국재료학회 2012 한국재료학회지 Vol.22 No.10
Recently, automobile parts have been required to have high strength and toughness to allow for weight lightening or improved stability. But, traditional micro-alloyed steel cannot be applied in automobile parts. In this study, we considered the influence of quenching temperature and cooling rate for specimens fabricated by vacuum induction furnace. Directly quenched micro-alloyed steel for hot forging can be controlled according to its micro structure and the heat-treatment process. Low carbon steel, as well as alloying elements for improvement of strength and toughness, was used to obtain optimized conditions. After hot forging at $1,200^{\circ}C$, the ideal mechanical properties (tensile strength ${\geq}$ 1,000 MPa, Charpy impact value ${\geq}\;100\;J/cm^2$) can be achieved by using optimized conditions (quenching temperature : 925 to $1,050^{\circ}C$, cooling rate : ${\geq}\;5^{\circ}C/sec$). The difference of impact value according to cooling rate can be influenced by the microstructure. A fine lath martensite micro structure is formed at a cooling rate of over $5^{\circ}C/sec$. On the other hand, the second phase of the M-A constituent microstructure is the cause of crack initiation under the cooling rate of $5^{\circ}C/sec$.
신정호,정정훈,백준기,김효주,Shin, Jeong-Ho,Jung, Jung-Hoon,Paik, Joon-Ki,Kim, Hyo-Ju 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.9
본 논문에서는 캠코더용 디지털 영상 확대 시스템의 VLSI 구현 기술을 제안한다. 제안된 VLSI는 입력 신호로써 시스템 클럭(CLK), 수직 동기 신호(VD), 수평 동기 신호(HD), 블랭크(BLK), 필드 신호(FLD)등을 사용하여 출력으로 최대 256배까지, 256단계의 다양한 배율로 확대된 영상을 구현할 수 있다. 일반적으로 대부분의 캠코더는 앞서 언급한 입력 신호들을 CCD 구동 IC에서 발생시킨다. 본 논문에서 제안한 디지털 영상확대 VLSI는 줌 스텝의 변화에 따라서 256가지의 다양한 배율로 영상을 확대할 수 있으며, 응용 측면에 있어서는 거의 연속적인 단계의 확대를 수행할 수 있기 때문에, 디지털 캠코더에서 별도의 마이콤이나 범용 신호처리기 등과 같은 부가 회로 없이도 사용할 수 있다. In this paper we propose a VLSI implementation technique for camcorder's digital zooming system. The proposed VLSI includes the system clock(CLK), vertical drive(VD), horizontal drive(HD),blank(BLK), and field(FLD) signals as inputs, and produces magnified image as an output, with 256 different magnification ratios. In general, the above mentioned input signals are provided by the CCD driving IC in most camcorders. As a result, the proposed digital zooming VLSI can magnify a part of the input image by up to 256 times, where the magnification ratio can be chosen among 256 different steps. In the application point of view, the proposed VLSI can be used in any digital camcorder for realizing near continuous step digital zooming without any additional circuitry, such as micom or a general purpose digital signal processor.
DWT 분석을 이용한 MCSA기반 유도 전동기 베어링 고장 진단
신정호(Jung-Ho Shin),강대성(Dae-Seong Kang) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.3
The systematic monitoring system about part of fault in induction motor is an important tool for check the induction motor. The representative method to the mechanical fault of induction motor likes bearing fault is the vibration method using the acceleration sensor. However, although the vibration method is able to show outstanding performance to the induction machinery, it has limitation to the body of the induction motor. In this paper proposed the diagnosis system using stator current easy to collect the signals. The system using data acquisition board and MRA(Multi-Resolution Analysis) based on DWT. It is speedy by parallel processing of neural network and diagnosis rate is approach the vibration method.
Copper 함량에 따른 Mo-Cu-N 박막의 미세구조 변화에 대한 연구
신정호(Jung Ho Shin),최광수(Kwang Soo Choi),왕계민(Qi Min Wang),김광호(Kwang Ho Kim) 한국표면공학회 2010 한국표면공학회지 Vol.43 No.6
Ternary Mo-Cu-N films were deposited on Si wafer substrates with various copper contents by magnetron sputtering method using Mo target and Cu target in Ar/N₂ gaseous atmosphere. As increasing N₂ pressure, the microstructure of Mo-N films changed from γ-Mo₂N of (111) having face-centered-cubic (FCC) structure to δ-MoN of (200) having hexagonal structure. Detailed the microstructures of the Mo-Cu-N coatings were studied by X-ray diffraction, scanning electron microscopy and field emission transmission electron microscope. The results indicated that the incorporation of copper into the growing Mo-N coating led to the Mo₂N and MoN crystallites were more well-distributed and refined and the copper existed in grain boundary. Ternary Mo-Cu-N films had a composite microstructure of the nanosized crystal crystalline γ-Mo₂N and δ-MoN surrounded by amorphous Cu₃N phase.
증기발생기 전열관 틈새복합환경(Pb+S+Cl)에서 Alloy 690의 응력부식균열거동
신정호 ( Jung-ho Shin ),임상엽 ( Sang-yeop Lim ),김동진 ( Dong-jin Kim ) 한국부식방식학회(구 한국부식학회) 2018 Corrosion Science and Technology Vol.17 No.3
The secondary coolant of a nuclear power plant has small amounts of various impurities (S, Pb, and Cl, etc.) introduced during the initial construction, maintenance, and normal operation. While the concentration of impurities in the feed water is very low, the flow of the cooling water is restricted, so impurities can accumulate on the Top of Tubesheet (TTS). This environment is chemically very complicated and has a very wide range of pH from acidic to alkaline. In this study, the characteristics of the oxide and the mechanism of stress corrosion cracking (SCC) are investigated for Alloy 690 TT in alkaline solution containing Pb, Cl, and S. Reverse U-bend (RUB) specimens were used to evaluate the SCC resistance. The test solution comprises 3m NaCl + 500ppm Pb + 0.31m Na<sub>2</sub>SO<sub>4</sub> + 0.45m NaOH. Experimental results show that Alloy 690 TT of the crevice environment containing Pb, S, and Cl has significant cracks, indicating that Alloy 690 is vulnerable to stress corrosion cracking under this environment.