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오스테나이트계 25Cr-20Ni 스테인리스강의 Ω법을 이용한 고온 크리프 거동 해석
박인덕,남기우,Park, In-Deok,Nam, Gi-U 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.2
For two kinds of 25Cr-20Ni stainless steels, STS310J1TB and STS310S with and without a small amount of Nb and N, creep behavior has been studied in a stress and temperature range from 147 to 392 MPa and from 923 to 773 K with a special reference to tertiary creep. The average creep life of STS310J1TB was about 100 times longer than that of the STS310S. The apparent activation energy for the initial creep rate was 330 kJ/mol in STS310J1TB, while that of the STS310S was 274kJ/mol in a power law creep region and 478 kJ/mol in a region of power law breakdown (PLB). The activation energy for STS310S below PLB is close to the for self-diffusion. When compensating for the temperature dependence of the Young's modulus and the omega value, it was found that the apparent activation energy for STS310J1TB was reduced to the activation energy for diffusion of chromium atom in gamma steel. The stress exponent of STS310S was about 12.3 above PLB and 5.1 in a power law creep region. Notwithstanding that the creep condition for STS310J1TB was in a power law creep region, its stress exponent was 7.9 larger than that of STS310S corresponding to the same creep conditions. This was ascribed to the presence of fine precipitates in STS310J1TB.
박인덕(In-Deok Park),이승환(Seung-Hwan Lee),최광진(Kwang-Jin Choi),김시경(Si-Kyung Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.10
This paper caused a distribution utility to generation of analysis fault several cases on the ground of substation in a energy meter three phase current, voltage data measurement to fault type and characteristics. Mother wavelet transformation of suitable to method algorism from the distribution utility to generation of fault in image impedance etc several parameter for utility characteristics effective to probatory fault point extraction.
HMI 터치스크린을 이용한 철도차량용 복합화재수신기 개발 연구
박인덕(In-Deok Park),김창(Chang Kim) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.1
Recent social needs for promoting traffic safety increased and the demand social security in economic, increasing the demand for environmentally friendly rail transport. In particular, when train express such as to secure reliability KTX(Korea Train eXpress) from potential disaster(fire) in the train operation caused by the train express running has been very important. Railroad fire extinguishing system is operated to fire exploding before reaching the flashing point more important than early to quickly detect because of CAN(Controller Area Network) communication to fire suppression and fire receiver, interface, fire fighting equipment from HMI((Human Machine Interface) and fire high-performance to research and development for intelligent composite fire receiver is required.
박인덕(In-Deok Park),이승환(Seung-Hwan Lee),김시경(Si-Kyung Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper is distribution utility to generation of analysis fault several cases on the ground of substation in a energy meter three phase current, voltage data measurement to fault type and characteristics. Mother wavelet transformation of suitable to method algorism from the distribution utility to generation of fault in image impedance etc several parameter for utility characteristics effective to probatory.
다우비치 웨이브릿 기법을 이용한 리커시브 실시간 고장점 표정시스템
박인덕(In-Deok Park),이승환(Seung-Hwan Lee),김시경(Si-Kyung Kim) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
This paper is distribution utility to generation of analysis fault several cases on the ground of substation in a energy meter three phase current, voltage data measurement to fault type and characteristics. Daubechie wavelet transformation of utilization method algorism from the distribution utility to generation of fault in image impedance etc several parameter for utility characteristics effective to make probe of recursive real time fault point system.
적응형 필터와 가변 임계값을 적용하여 잡음에 강인한 심전도 R-피크 검출
세이푸르(MD Saifur Rahman),최철형(Chul-Hyung Choi),김시경(Si-Kyung Kim),박인덕(In-Deok Park),김영필(Young-Pil Kim) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.12
심전도(ECG) 신호에서 R-피크를 추출하는 기법에 대하여 많은 연구가 진행 되어 왔으며, 다양한 방법으로 구현되어 왔다. 그러나 이러한 검출 방법 대부분은 실시간 휴대용 심전도 장치에서 구현하기가 복잡하고 어려운 단점이 있다. R-피크 검출을 위해서는 심전도 데이터에 대하여 베이스라인 드리프트 및 상용전원 잡음 제거 등의 적절한 전처리 및 후가공이 필요하며, 특히 적응형 필터를 활용한 기법에서는 적절한 임계값을 선택하는 것이 중요하다. 적응형 필터의 임계값을 추출하는 방식에서는 고정형(Fixed) 및 적응형(adaptive)으로 구분할 수 있다. 고정 임계 값 추출 방식은 고정된 임계값 보다 낮은 값의 입력이 들어오는 경우에 R-피크 값을 감지하지 못하는 경우가 있으며, 적응 임계값 추출 방식은 때때로 잡음에 의한 잘못된 임계값을 도출하여, 다른 파형(P혹은 T파)의 피크를 감지하는 경우도 나타난다. 본 논문에서는 계산상의 복잡성이 적고, 코드구현이 단순하면서도 잡음에 강인한 R-피크 검출 알고리즘을 제안한다. 제안된 방식은 앞서 설명한 임계값 추출 문제를 해결하기 위해서, 적응형 필터를 사용해, 심전도 신호에서 베이스 라인 드리프트 제거를 하여 적절한 임계값을 계산하도록 한다. 그리고 필터 처리된 심전도 신호의 최소 값과 최대 값을 사용하여 적절한 임계값이 자동으로 추출 되도록 한다. 그런 다음 심전도 신호로부터 R-피크를 검출하기 위해 임계값 아래에서 ‘neighborhood searching’ 기법이 적용된다. 제안된 방법은 R-피크 검출의 정확도를 향상시키고, 계산 량을 줄여 검출 속도가 보다 빨라지도록 하였다. 다음으로 R-피크 값이 검출 되면, R-R interval 등의 값을 이용해 심박 수를 계산할 수 있도록 한다. 실험결과 심박 수 검출 정확도와 감도가 약 100%로 매우 높았음을 확인할 수 있었다. There have been numerous studies on extracting the R-peak from electrocardiogram (ECG) signals. However, most of the detection methods are complicated to implement in a real-time portable electrocardiograph device and have the disadvantage of requiring a large amount of calculations. R-peak detection requires pre-processing and post-processing related to baseline drift and the removal of noise from the commercial power supply for ECG data. An adaptive filter technique is widely used for R-peak detection, but the R-peak value cannot be detected when the input is lower than a threshold value. Moreover, there is a problem in detecting the P-peak and T-peak values due to the derivation of an erroneous threshold value as a result of noise. We propose a robust R-peak detection algorithm with low complexity and simple computation to solve these problems. The proposed scheme removes the baseline drift in ECG signals using an adaptive filter to solve the problems involved in threshold extraction. We also propose a technique to extract the appropriate threshold value automatically using the minimum and maximum values of the filtered ECG signal. To detect the R-peak from the ECG signal, we propose a threshold neighborhood search technique. Through experiments, we confirmed the improvement of the R-peak detection accuracy of the proposed method and achieved a detection speed that is suitable for a mobile system by reducing the amount of calculation. The experimental results show that the heart rate detection accuracy and sensitivity were very high (about 100%).