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Categorized 가변 스텝 사이즈 LMS 알고리즘
김선호,전상배,임준석,성굉모,Kim, Seon-Ho,Chon, Sang-Bae,Lim, Jun-Seok,Sung, Koeng-Mo 한국음향학회 2009 韓國音響學會誌 Vol.28 No.8
소음이 존재하고, 신호의 전달 시스템이 가변적인 환경에서 신호처리는 일반적으로 적응 알고리즘에 의해 이뤄진다. 다양한 적응 알고리즘들 중에서 LMS 알고리즘은 연산량이 적고, 구현이 쉬우며, 성능이 훌륭해 가장 널리 쓰이는 알고리즘이 되었다. LMS 알고리즘의 성능에 영향을 미치는 가장 중요한 요소 중 하나가 Step Size이다. 일반적으로, Step Size가 크면, 알고리즘 수렴 속도는 빨라지지만, 수렴 오차는 커지게 되고, Step Size가 작으면 수렴 오차는 작아지지만, 수렴 속도는 느려진다. Step Size의 이러한 특성을 상호 보완하고자 많은 방법들이 제안되어 오고 있다. 본 논문에서는 오차 제곱 변화 곡선의 기울기로부터 현재 상태에 대한 카테고리를 분류하여, Step Size를 매 단계마다 적절하게 가변시킴으로써, 결과적으로 수렴 속도와 정확도, 연산량을 향상시킨 새로운 개념의 Categorized 가변 스텝 사이즈 LMS 알고리즘을 제시하고, 그 성능은 실험을 통하여 수렴 속도와 Excessive Mean Square Error (EMSE), 연산량의 관점에서 향상되었음을 검증하였다. Information processing in variable and noisy environments is usually accomplished by means of adaptive filters. Among various adaptive algorithms, Least Mean Square (LMS) has become the most popular for its robustness, good tracking capabilities and simplicity, both in terms of computational load and easiness of implementation. In practical application of the LMS algorithm, the most important key parameter is the Step Size. As is well known, if the Step Size is large, the convergence rate of the algorithm will be rapid, but the steady state mean square error (MSE) will increase. On the other hand, if the Step Size is small, the steady state MSE will be small, but the convergence rate will be slow. Many researches have been proposed to alleviate this drawback by using a variable Step Size. In this paper, a new variable Step Size LMS(VSSLMS) called Categorized VSSLMS (CVSSLMS) is proposed. CVSSLMS updates the Step Size by categorizing the current status of the gradient, hence significantly improves the convergence rate. The performance of the proposed algorithm was verified from the view point of convergence rate, Excessive Mean Square Error(EMSE), and complexity through experiments.
김선호(Sun-Ho Kim),주정훈(Junghoon Joo),이석영(Seog Young Lee),이강욱(Kang Ug Lee),오상진(Sang Jin Oh) 한국표면공학회 2004 한국표면공학회지 Vol.37 No.3
Plasma Display Panel is a display device emitting fluorescent light from gas discharge between a front and a rear panel sealed together. Front and rear panel have multitude of film layers and barrier ribs in the rear panel has the largest area so releasing various gases and affecting light emitting characteristics and lifetime. The remaining gases in a barrier rib were studied by thermal desorption analysis up to 400℃ and main gases were H₂ H₂O, CO. During sustaining at 300℃, the outgassing rates from other gases were decreased but H₂ kept constantly increasing until I hour, which can be originated from the dissociation of organics remained in the inside of barrier rib material. In H₂O, two distinct peaks were observed : desorption from physically adsorbed one at 100℃ and from chemically adsorbed one 400℃. The result can be utilized in interpretation of electronic and optical characteristics and evacuation process control of PDP
Excel 해 찾기 모듈을 이용한 사료배합 프로그램과 산란계의 성장모델시스템에 관한 연구
김선호 ( Seon Ho Kim ),이승환 ( Seoung Hwan Lee ),이상석 ( Sang Suk Lee ) 한국축산학회(구 한국동물자원과학회) 2021 축산기술과 산업 Vol.8 No.1
An assorted feed technology maximized productivity and margin of profit by allowing to the domestic animals making supply and economical food that have balance as nutrition applying domestic animals science of nutrition and food learning. Least cost formula creation that product design that use Feed Mix Program for these purpose can satisfy nutrient requirement was available. Non-linear optimum code Generalized Reduced Gradient (GRG2) that Texas College and Cleveland State University develop as a tool that to find Microsoft Excel is indispensable solving linear programming problem that handle in spreadsheet modelling is used. Divergence and border law that simple method and Frontline Systems that fan shape and proper move problem use the variable border develops are used. Need data for raw material, product basically because tell feed mixing problem on unpack, and name of raw material, raw material unit cost, raw material ingredient by growth step that get into standard of design. Growth Modelling System was studied IPGM (International Pig Growth Modelling Group). Important purpose of this project is so that on-the-spot survey presents available growth model. Is displaying definitely dialogue current connected with alimentation but mean fundamental, and biologic alimentation principle is thing which do simulation. Ultimate purpose of layer industry is producing egg of high quality efficiently. Is influenced to several factors such as production potential energy of layer, environment condition, food intake, food, disturbed family. These leading persons do on summer period so that might can operate specification system that is correct to each farm because influence in productivity and studied growth model technique application of layer.
주조용 A356 합금의 인장 및 고주기 피로 특성에 미치는 열처리 영향
김선호 ( Seon Ho Kim ),김규식 ( Kyu Sik Kim ),조규상 ( Kyu Sang Cho ),어광준 ( Kwang Jun Euh ),임영목 ( Young Mok Rhyim ),이기안 ( Kee Ahn Lee ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.2
In this study, the effect of heat treatment (peak aging, T6) on the porosity and high-cycle fatigue deformation behavior of A356 alloy was investigated. As a result of tensile and high-cycle fatigue tests, A356-T6 exhibited superior tensile strengths (44% increased), fatigue life, and fatigue limit (43% increased) compared to A356-F alloy, due mainly to the evolution of microstructure followed by T6 heat treatment. Globular Si particles, evenly distributed fine Mg2Si particles, and decreased dendrite arm spacing were found to have enhanced tensile and high-cycle fatigue properties effectively. Note, however, that the deteriorating effects of pores were greater on A356-T6 alloy compared to A356-F alloy; those were analyzed using ΔK (stress intensity factor range) parameters.
김선호(Son-Ho Kim),성민규(Minkyu Sung) 사단법인 언론과 사회 2014 언론과 사회 Vol.22 No.1
우리는 인간의 본성에 이타적 측면이 있으며, 그 이타성의 바탕이 신경생물학적 의미의 공감 작용에 있다는 최근 주장에 대해 보다 신중한 접근이 필요하다고 본다. 신경생물학을 포함하여 과학적 방법을 통해 공감을 이해하려는 시도들은 공감을 자연화시키면서 기계론에 빠질 위험과, 집합적이고 사회적 측면을 도외시하면서 공감을 개인 심리적 현상으로 환원시킬 위험을 내포하고 있기 때문이다. 우리는 공감 개념의 지적 발원지인 현상학적 논의들을 살펴보면서 자동적-기계적 관정이 아니라 커뮤니케이션적인 실천으로서 공감을 이론화시키기 위해 원거리 관찰자 개념을 제안하는 한편, 공감이 어떻게 집합적 현상으로 설명될 수 있는지 아담 스미스의 불편부당한 관찰자 개념을 빌어 설명하려고 시도한다. 그러면서 우리는 특히 미디어 커뮤니케이션 현상으로서 공감의 모델을 정식화시키고자 한다. This article investigates the communicative aspects of empathy. Pointing out that the predominant neurological notions tend to reduce empathy to a mechanistic and individual phenomenon, we suggest that empathy be viewed as a social communicative process. Specifically, we discuss problems of theories of emotional contagion and vicarious experience in which empathy is conceived as sharing an identical emotional state with other entities, and posit that distant spectatorship is the primary position of the emphatic agents who do not necessarily share such an emotion. With this respect, we argue that Adam Smith"s concept of the impartial spectator sheds light on understanding empathy as a distant spectators" response induced by the communication media.