변수 불확실성을 가지는 시스템에 대한 견실비약성 $H_{\infty}$ 칼만형필터 설계: PLMI 접근법

김준기,양승협,방경호,박홍배,Kim, Joon Ki,Yang, Seung Hyeop,Bang, Kyung Ho,Park, Hong Bae 대한전자공학회 2012 전자공학회논문지 Vol.49 No.10

본 논문에서는 변수 불확실성과 필터이득 섭동을 가지는 시스템에 대한 견실비약성 $H_{\infty}$ 칼만형필터 설계기법을 제안한다. 필터가 존재할 충분조건과 견실비약성 $H_{\infty}$ 필터 설계기법을 선형행렬부등식 (LMI: Linear Matrix Inequality 접근법으로 제안하고 시스템과 필터의 불확실성을 매개변수화 선형행렬부등식(PLMI: Parameterized Linear Matrix Inequality)으로 구조화된 불확실성의 형태로 표현한 후 Lyapunov 함수를 통해 시스템의 불확실성과 더불어 필터이득섭동을 고려한 칼만형 $H_{\infty}$ 필터가 존재할 충분조건과 필터설계기법을 PLMI 형태로 보인다. PLMI는 무한개의 LMI의 형태로 나타나므로 완화기법(relaxation technique)을 적용하여 유한개의 LMI의 형태로 변환한 후 견실하고 최적화된 필터이득과 필터섭동범위를 계산하고, 예제와 모의실험을 통해 제시된 필터의 타당성을 검증한다. In this paper, we describe the synthesis of robust and non-fragile Kalman filter design for a class of uncertain linear system with polytopic uncertainties and filter gain variations. The sufficient condition of filter existence, the design method of robust non-fragile filter, and the measure of non-fragility in filter are presented via LMIs(Linear Matrix Inequality) technique. And the obtained sufficient condition can be represented as PLMIs(parameterized linear matrix inequalities) that is, coefficients of LMIs are functions of a parameter confined to a compact set. Since PLMIs generate infinite LMIs, we use relaxation technique, find the finite solution for robust non-fragile filter, and show that the resulting filter guarantees the asymptotic stability with parameter uncertainties and filter fragility. Finally, a numerical example will be shown.

시간지연을 가지는 비선형 상호연결시스템의 견실비약성 $H_{\infty}$ 분산 퍼지모델 제어기법

김준기,양승협,권영신,방경호,박홍배,Kim, Joon-Ki,Yang, Seung-Hyeop,Kwon, Yeong-Sin,Bang, Kyung-Ho,Park, Hong-Bae 대한전자공학회 2010 電子工學會論文誌-SC (System and control) Vol.47 No.6

본 논문에서는 폴리토프 불확실성과 시간지연, 그리고 제어기 섭동을 가지는 비선형 상호연결시스템의 상태궤환 제어기에 대한 견실비약성 $H_{\infty}$ 분산 퍼지제어기 설계 방법을 다룬다. 먼저 시간지연을 가지는 비선형 상호연결시스템을 Takagi-Sugeno 퍼지모델로 나타내고, 이로부터 지연종속 견실비약성 $H_{\infty}$ 퍼지제어기가 존재하기 위한 충분조건, 제어기 설계방법 및 비약성을 만족하는 제어기의 꽉찬집합(compact set)을 제시한다. 이 때 제시한 조건은 변수치환과 슈어여수(Schur complement)정리를 통해 선형행렬부등식(LMI: Linear Matrix Inequality)의 계수가 꽉찬 집합 내의 파라미터의 함수로 정의되는 파라미터화 선형행렬부등식(PLMIs: Parameterized Linear Matrix Inequalities)으로 표현되며, 이를 완화기법(relaxation technique)를 사용하여 유한개의 선형행렬부등식으로 변환하고, 제어기와 비약성을 만족하는 제어기 영역을 구한다. 마지막으로 예제와 모의실험을 통해 불확실성과 시간지연, 제어기이득 섭동에도 불구하고 제안한 퍼지제어기가 폐루프시스템을 안정화시키고 외란감쇠를 보장함을 확인한다. In general, due to the interactions among subsystems, it is difficult to design an decentralized controller for nonlinear interconnected systems. In this study, the model of nonlinear interconnected systems is studied via decentralized fuzzy control method with time delay and polytopic uncertainty. First, the nonlinear interconnected system is represented by an equivalent Takagi-Sugeno type fuzzy model. And the represented model can be rewritten as Parameterized Linear Matrix Inequalities(PLMIs), that is, LMIs whose coefficients are functions of a parameter confined to a compact set. We show that the resulting fuzzy controller guarantees the asymptotic stability and disturbance attenuation of the closed-loop system in spite of controller gain variations within a resulted polytopic region by example and simulations.

변수 불확실성을 가지는 시스템에 대한 견실비약성 H∞ 칼만형필터 설계

김준기(Joon Ki Kim),양승협(Seung Hyeop Yang),방경호(Kyung Ho Bang),박홍배(Hong Bae Park) 대한전자공학회 2012 전자공학회논문지 Vol.49 No.10

본 논문에서는 변수 불확실성과 필터이득 섭동을 가지는 시스템에 대한 견실비약성 H∞ 칼만형필터 설계기법을 제안한다. 필터가 존재할 충분조건과 견실비약성 H∞ 필터 설계기법을 선형행렬부등식 (LMI: Linear Matrix Inequality 접근법으로 제안하고 시스템과 필터의 불확실성을 매개변수화 선형행렬부등식(PLMI: Parameterized Linear Matrix Inequality)으로 구조화된 불확실성의 형태로 표현한 후 Lyapunov 함수를 통해 시스템의 불확실성과 더불어 필터이득섭동을 고려한 칼만형 H∞ 필터가 존재할 충분조건과 필터설계기법을 PLMI 형태로 보인다. PLMI는 무한개의 LMI의 형태로 나타나므로 완화기법(relaxation technique)을 적용하여 유한개의 LMI의 형태로 변환한 후 견실하고 최적화된 필터이득과 필터섭동범위를 계산하고, 예제와 모의실험을 통해 제시된 필터의 타당성을 검증한다. In this paper, we describe the synthesis of robust and non-fragile Kalman filter design for a class of uncertain linear system with polytopic uncertainties and filter gain variations. The sufficient condition of filter existence, the design method of robust non-fragile filter, and the measure of non-fragility in filter are presented via LMIs(Linear Matrix Inequality) technique. And the obtained sufficient condition can be represented as PLMIs(parameterized linear matrix inequalities) that is, coefficients of LMIs are functions of a parameter confined to a compact set. Since PLMIs generate infinite LMIs, we use relaxation technique, find the finite solution for robust non-fragile filter, and show that the resulting filter guarantees the asymptotic stability with parameter uncertainties and filter fragility. Finally, a numerical example will be shown.

German shepherd에서 발생한 기관 골,연골형성증

김준기 ( Joon Ki Kim ),서강문 ( Kang Moon Seo ),한정희 ( Jeong Hee Han ) 한국임상수의학회 2000 한국임상수의학회지 Vol.17 No.1

고령층의 통행환경 분석

김준기(Kim, Joon-Ki),손기민(Sohn, Kee-Min),오성호(Oh, Sung-Ho),박종일(Park, Jong-Il) 대한교통학회 2012 대한교통학회 학술대회지 Vol.66 No.-

종료 유의동사가 갖는 명사연어의 의미범주코퍼스기반 연구

김준기 ( Joon Ki Kim ) 한국현대언어학회 2015 언어연구 Vol.31 No.3

The purpose of this study is to investigate the semantic domains of the noun collocations of the synonymous verbs finish, end, complete, stop, quit, cease, halt, and terminate through the Corpus of Historical American English (COHA). This paper demonstrates how semantic domains are obtainable by using a systematic semantic-tagging tool rather than judgments based only on theoretical analysis, and how they are thus reflected, to judge the semantic characteristics of termination verbs. In order to explore the semantic domains of noun collocations of termination verbs, we used the corpus analysis tool Wmatrix. Our findings are as follows: (1) the semantic characteristics of each termination verb suggested by Freed (1979) and Givon (1972) are more clearly explained and understood when the semantic tagging procedure is applied through Wmatrix to the noun collocates; (2) the frequency of the collocation of termination verbs has, according to their semantic domains, increased over time, especially since the 1900s. (Dongseo University)

현대 미국 영어 말뭉치에 나타난종료의미 유의동사의 명사연어 분석 연구

김준기 ( Joon Ki Kim ) 대한언어학회 2014 언어학 Vol.22 No.1

The purpose of this study is to investigate the semantic differences and similarities among the synonymous verbs finish, end, complete, stop, quit, cease, halt, and terminate as well as to analyze the noun collocations shown as their complements through the Corpus of Contemporary American English. This paper demonstrates that although the verbs share the common meaning of termination, they have some semantic differences in terms of the degree of completion of the event. The semantic characteristic of finish is that it implies the full completion of the event. That of end is that it implies interruption without any resumption. In particular, stop allows a reading which implies a possible resumption of the event. We found that these semantic differences of verbs are reflected in their taking up as their complements the collocations which have temporal differences; therefore, the verbs involve some different categories of collocations. This study reveals how the semantic properties of noun collocations which collocate with each verb are very helpful in distinguishing the semantic meanings of synonymous verbs of termination.

예측/의지 조동사의 지역 영어별 차이에 관한 코퍼스 기반연구

김준기(Kim, Joon-Ki) 한국영미어문학회 2008 영미어문학 Vol.- No.89

English is the de facto common language of international print media. Despite this commonality, there are contentions that regional differences still exist between English usage in EFL/ESL communities versus ENL communities, in which English is the native tongue. Prior research on oral and written language samples has suggested that item usage may vary within grammatical categories, and that particular regional differences occur in modal auxiliaries. The present study further investigated such findings by analyzing tokens in written corpora consisting of newspaper articles. It focused on the usage of modals of prediction and volition such as will, would, shall, and be going to in newspaper articles published in different English language communities. The results indicated that these modals are subject to regional differences in usage.

섭식장애 가족에 대한 개입

김준기(Kim Joon Ki),공성숙(Kong Sung Sook) 한국가족치료학회 2001 가족과 가족치료 Vol.9 No.2

섭식장애는 사회·문화적인 요인과 더불어 가족적인 요인에 의해서 많은 영향을 받는다는 점에서 가족치료가 중요한 개입방법의 하나가 될 수 있다. 본 연구에서는 섭식장애 환자의 가족치료에 대한 이론적 모형, 특히 Minuchin의 구조적 가족치료와 Maudsley 모델을 근간으로 이론적 배경과 치료 접근방법을 고찰하고 임상사례의 분석을 통하여 그 치료기법을 적용하는 과정과 효과를 알아보았다. Minuchin의 모델에서는 밀착, 과잉보호, 경직성, 갈등회피, 갈등우회에 대한 개입을 중시한다. 반면, Maudsley 모델에서는 초기에 부모로 하여금 환자의 식행동에 개입하게 함으로써 증상을 감소시킨 후, 새로운 관계유형을 만들어서, 청소년기의 문제를 다룬 후에 종결을 한다. 본 연구의 결과를 통하여 형제관계를 다루는 session을 포함하는 것과 매우 지쳐 있는 상태에서 병원을 방문하게 되는 환자의 부모에게 힘을 불어넣고 치료동기를 증진시키기 위한 자조집단의 구성 등을 제언하였다. Family Therapy is an important intervention tool for families of eating disorder when it is greatly affected by familial factors as well as social and cultural factors. This study looked into Minuchin s structural family therapy and Maudsley s multifactorial model as theoretical foundations for an intervention to a family with an eating disorder client. In Minuchin s model, intervention to enmeshment, over protection, rigidity, conflict avoidance, and conflict detour is emphasized. In Maudsley s medel, on the other hand, the intervention is started with refeeding the patient. Negotiation for a new pattern of relationship and dealing with problems of adolescent stage take place after the initial stage. Authors suggest 1. therapy sessions that deals with sibling issues; and 2. support groups for the burned-out parents in order to empower them and enhance their motivation for the treatment of their children .

전치사 Over의 명사연어 선호도 분석 및 의미범주 코퍼스기반 연구

김준기(Joon-ki Kim) 한국영미어문학회 2021 영미어문학 Vol.- No.143

The purpose of this paper is to examine the correlation between the semantic characteristics of the noun collocates taken by the preposition over and the meaning of the preposition over in the combination of over and a noun collocate. For this, collostructional analysis, one of the corpus-based quantitative methods that can measure lexicogrammatical attraction, is used to measure the interaction between the preposition over and a noun. Additionally, the nouns found in COCA were categorized using Wmatrix, and their correlation with the meaning of the preposition over was examined. The analysis results are as follows. First, through the semantic category analysis of noun collocate, it was found that the preposition over shows a higher association with the noun of an abstract concept that mainly conveys a metaphorical meaning. Second, the attraction in the construction is different even between words belonging to the same semantic category, and the degree of the attraction according to frequency is not necessarily proportional to the noun’s reliance on the meaning of the preposition over.