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Classification of Defects in a Thermal Barrier Coating Layer using the Fuzzy C-means Algorithm
김평호,김정석,박진효,이구현,송요승,이득용 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.16 No.1
A thermally grown oxide (TGO) layer of Al2O3 is formed between a CoNiCrAlY bond coating and a zirconia top coating of a thermalbarrier coating (TBC) system on an Inconel 738 substrate during exposure at 1050°C. Thick TGO is vulnerable to damage in termsof cracking and spallation. In order to estimate the TBC failure, fundamental damage data of TGO that is induced by compressedair are monitored to determine the failure mode and the state of damage by using a nondestructive acoustic emission (AE) system. The defects of the TGO are detected and evaluated by means of AE signal analysis with the root mean squared value in the frequencyrange of 100 kHz to 400 kHz. The thickness of the TGO increased with the oxidation time. The RMS (Root Mean Square) valuedecreased almost linearly as the TGO thickness increased up to the failure of the TBC. The amplitude of the AE signal decreaseddramatically when the TGO was delaminated. The AE signals for pattern classification were evaluated in accordance with the TBClayer. It is conceivable that the center value represents the damage state of the TBC coating.
Back Propagation 알고리즘을 이용한 초음파 전동기의 위치제어에 관한 연구
김평호 서강정보대학 1999 산업과학연구 Vol.1 No.-
Recently, neural networks have been the focus of a great deal of attentions. Multilayer neural networks have been used successfully for a wide variety of applications, such as pattern recognition, identification and fault detection. From 1990' s, Neural networks begin to be used in servo drive field. Neural network controller can respond flexibly to unexpected and complex situation by using their self-learning capability, generalization ability, fault tolerance ability and a great degree of robustness. In contrast, conventional controller must be programmed in advance so that response to these variations properly. The inherent performance of Ultrasonic Motor(USM) which is one of highlighted a directly-driven positioning servo motor/actuator. In this paper, the speed of control USM based on neural network control. The neural network control can roughly be classified as the direct control and indirect control schemes. An indirect control scheme is adapted for USM speed control. A back propagation algorithm is used to train neural network controller.
김평호,Kim, Pyung-Ho 한국언론정보학회 2005 한국언론정보학보 Vol.30 No.-
방통융합 관련 법제개편 연구에서 '왜 방통융합 법제로의 개편이 필요한가?'라는 물음에 대해 제시되고 있는 근거와 이유는 두 가지로 요약된다. 하나는 '미디어 정책구조(media governance perspective)'에 초점을 둔 입장이며 두 번째는 '미디어 산업(media industry perspective)'에 초점을 둔 입장이다. 방통융합 환경에서 전자가 주로 방송통신 전반의 정책과 행정의 일관성과 효율성을 강조하는 입장이라면, 후자는 방송통신 관련 산업의 성장과 발전을 강조하는 입장이다. 미디어 정책구조의 관점이나 미디어 산업의 시각에서 제시하고 있는 방통법제통합의 이유와 근거는 나름대로 논리적이며 타당한 근거를 가지고 있고 또 지적된 여러 문제점들을 감안할 때 방통법제의 개편이 우리 사회에 주어진 중요한 현안과제임에는 틀림없다. 그러나 논리적, 현실적 타당성과 필요성에도 불구하고 여기에는 단선적인 제도주의적 사고에 기초한 '입법만능주의(legalism)'와 '근시안적 경제주의(myopic economism)'라는 두 가지의 근본적 문제가 놓여있다. 입법만능주의는 제도의 형식적 완결성에 강조점을 두면서 제도가 가지고 있는 실질적 내용에 대한 분석과 관찰이 부족한 문제를, 근시안적 경제주의는 좁은 의미의 경제산업적 가치에 치중하면서 매체 공익성과 같은 사회문화적 차원의 관심을 평가절하하거나 우리나라의 매체산업/정보기술 산업정책이 가지고 있는 근본적 결함을 제대로 짚지 못하고 있는 문제를 뜻한다. 방통융합 법제개편이 기대한 만큼의 성과를 이룩하기 위해서는 이 같은 두 가지 문제에 대한 적절한 대안제시를 포함하는 보다 진전된 논의가 선행되어야 할 것이다. Most of the convergence studies argue the reform of the current policy regime of broadcasting and telecommunications in Korea from two perspectives: 1) the media governance perspective and 2) the media industry perspective. The former emphasizes the need of integrity, consistency and efficiency of the regime in the convergence environment, while the latter focuses upon the growth and development of the media industry making the best of economic and industrial opportunities that are spawned by digital convergence. Although their arguments are logical and robust, they are lopsided in terms of legalism and myopic economism due to the linear perception of institutionalism, Bureaucratic administrative practices as well as ostentatious IT policies that have chronically plagued the policy regime in Korea cannot be resolved by simply assimilating distinct regulatory bodies and laws. Unless these two issues are properly addressed, the convergence of media policy institutions would end up a half-success or half-failure contrary to the exportations of existing studies.