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CFCM 기반 적응 뉴로-퍼지 시스템에 의한 비선형 시스템 모델링
곽근창,김성수,유정웅,전명근 충북대학교 컴퓨터정보통신 연구소 2002 컴퓨터정보통신연구 Vol.10 No.2
본 논문에서는 여러 분야에서 널리 응용되고 있는 적응 뉴로-퍼지 시스템에서의 효과적인 퍼지 규칙 생성 방법을 제안한다. 기존의 입력공간 그리드 분할을 이용한 ANFIS의 규칙 생성에 있어서는 얻어진 규칙의 수가 지수적으로 증가하는 단점이 있다. 이에, 본 연구에서는 조건부적인 퍼지 클러스터링(CFCM)을 이용하여 입·출력 데이터의 특성을 잘 반영할 수 있는 클러스터를 구하고, 퍼지 균등화 방법을 적용하여 출력변수의 소속함수를 자동 생성하도록 하였다. 이렇게 함으로써 적은 규칙 수를 갖으면서도 효율적인 퍼지 규칙을 얻을 수 있도록 하였다. 이들 방법의 유용함을 보이고자 정수장 응집제주입결정 모델링에 적용하여 제안된 방법이 기존의 연구보다 좋은 결과를 보임을 알 수 있었다. In this paper, an efficient fuzzy rule generation scheme for Adaptive Network-based Fuzzy Inference System(ANFIS) using the conditional fuzzy c-means(CFCM) and fuzzy equalization(FE) methods is proposed. Usually, the number of fuzzy rules exponentially increases by applying the grid partitioning of the input space, in conventional ANFIS approaches. Therefore, GFCM clustering method is adopted to render the clusters which represent the given input and output fuzzy data and FE method is used to automatically construct the fuzzy membership functions. From this, one can systematically obtain a small size of fuzzy rules which shows satisfying performance for the given problems. Finally, we applied the proposed method to the nonlinear system modeling problems and obtained a better performance than conventional works.
Definitive concurrent chemoradiotherapy in locally advanced pancreatic cancer
Kwak, Yoo-Kang,Lee, Jong Hoon,Lee, Myung-Ah,Chun, Hoo-Geun,Kim, Dong-Goo,You, Young Kyoung,Hong, Tae-Ho,Jang, Hong Seok The Korean Society for Radiation Oncology 2014 Radiation Oncology Journal Vol.32 No.2
Purpose: Survival outcome of locally advanced pancreatic cancer has been poor and little is known about prognostic factors of the disease, especially in locally advanced cases treated with concurrent chemoradiation. This study was to analyze overall survival and prognostic factors of patients treated with concurrent chemoradiotherapy (CCRT) in locally advanced pancreatic cancer. Materials and Methods: Medical records of 34 patients diagnosed with unresectable pancreatic cancer and treated with definitive CCRT, from December 2003 to December 2012, were reviewed. Median prescribed radiation dose was 50.4 Gy (range, 41.4 to 55.8 Gy), once daily, five times per week, 1.8 to 3 Gy per fraction. Results: With a mean follow-up of 10 months (range, 0 to 49 months), median overall survival was 9 months. The 1- and 2-year survival rates were 40% and 10%, respectively. Median and mean time to progression were 5 and 7 months, respectively. Prognostic parameters related to overall survival were post-CCRT CA19-9 (p = 0.02), the Eastern Cooperative Oncology Group (ECOG) status (p < 0.01), and radiation dose (p = 0.04) according to univariate analysis. In multivariate analysis, post-CCRT CA19-9 value below 180 U/mL and ECOG status 0 or 1 were statistically significant independent prognostic factors associated with improved overall survival (p < 0.01 and p = 0.02, respectively). Conclusion: Overall treatment results in locally advanced pancreatic cancer are relatively poor and few improvements have been accomplished in the past decades. Post-treatment CA19-9 below 180 U/mL and ECOG performance status 0 and 1 were significantly associated with an improved overall survival.
Identification of QTLs Associated with Cold Tolerance in Rice(O. sativa L.)
You-Chun Song,Jun-Hyeon Cho,Woon-Gu Ha,Ji-Yoon Lee,No-Bong Park,Jin-Il Choung,Do-Yeon Kwak,Min-Hee Nam,Shambhu P. Khatiwada,T. Akhtar,B. Chaudhary,Byeon-Geun Oh 한국작물학회 2008 한국작물학회 학술발표대회 논문집 Vol.2008 No.10
Cold tolerance at every growing stage of rice(Oryza sativa L.) is one of the main determinations for the stable growth in temperature and high elevate area. In the current study, a 181 lines of BC population derived from a cross of Gayabyeo, a Tongil type sensitive to cold and Chhamrong a tolerant to cold were evaluated for cold tolerance with cold water irrigation(17℃) at seeding stage as well as low temperature germinate at 13℃, respectively. The resulting linkage map consists of 157 marker loci, covering all of 12 rice chromosomes and spanning 910cM(Haldane function) with an average interval of 76cM between markers. Three main-effect QTLs were identified. The comparison of the OTLs identified in this cold treatments resulted in an intriquing finding that each treatments were controlled by a major QTL. The QTL qCWI-4 on chromosome 4 was found to increase its additive effect to -0.84 as the cold water irrigate stress was given. In the meanwhile, the QTL qLTG-8 was detected with a LOD score of5.54, explaining up to 13% of the phenotypic variation controlled by Gayabyeo allele. In addition, the QTL qLTGV-3, controlled by Gayabyeo allele with a LOD score of 5.19 explaining about 12.5% of the variation was also identified. These results would favor our better understanding of the genetic control of cold tolerance in rice and be important for the development of rice cultivars with a broaden climatic adaptation.
Kang, Geun-Il,Kwak, Si-Young,Park, Chun-Seong The Society of Naval Architects of Korea 2017 International Journal of Naval Architecture and Oc Vol.9 No.5
With an increase in the usage of LNG, there is a heightened interest about its safety aspects regarding the explosion of LNG carrier tank. The need for a cryogenic explosion-proof camera has increased. The camera has to work in cryogenic environment (below $-160^{\circ}C$) in LNG carrier. This study conducted design and heat transfer analysis of cryogenic camera to secure working time in limitation of heat source. The design with gap width of double pane windows was conducted based on simple vertical cavity model to insulate from cryogenic environment. The optimal gap width was 12.5 mm. For effective analysis considering convection within the camera, equivalent thermal conductivity method was adopted with ABAQUS. The working time of the camera predicted was over 10 h at warm-start condition. In cold-start condition, it required about 5 h of pre-warming time to work. The results of analysis were compared with the ones of the actual cryogenic test.
곽지은 ( Jieun Kwak ),김미정 ( Mi Jung Kim ),박혜영 ( Hye-young Park ),심은영 ( Eun-yeong Sim ),천아름 ( Areum Chun ),최인덕 ( In Duck Choi ),오유근 ( You Geun Oh ),이춘기 ( Choon-ki Lee ),전용희 ( Yong-hee Jeon ),구본철 ( Bon Che 한국식품조리과학회(구 한국조리과학회) 2021 한국식품조리과학회지 Vol.37 No.3
Purpose: This study investigated the quality characteristics of extruded rice noodles, by comparing the different particle size of the high-amylose rice cultivar (range, < 75 μm, 75∼150 μm, >150 μm). Methods: We analyzed the main physicochemical, hydration, and starch gelatinization properties of rice flours based on the particle size. Furthermore, the cooking quality and textural profiles of rice noodles were also compared by particle size. Results: The smaller particle size rice flour showed lower starch gelatinization temperature, but higher breakdown, peak, trough, final viscosity, and water hydration properties. In addition, the cooking loss rate and the cooked water turbidity of rice noodles were both significantly lower when smaller size rice flour was used. Conclusion: This study compares the quality characteristics of rice noodles according to the particle size of the high- amylose rice cultivar. Water absorption index, water solubility, and swelling power of rice flour showed a distinct negative correlation with the cooking loss rate of noodles.
퍼지 소속도를 갖는 Fisherface 방법을 이용한 얼굴인식
곽근창(Keun-Chang Kwak),고현주(Hyoun-Joo Go),전명근(Myung-Geun Chun) 한국정보과학회 2004 정보과학회논문지 : 소프트웨어 및 응용 Vol.31 No.6
본 논문에서는 퍼지논리에 기초한 Fisherface 얼굴인식 방법의 확장을 다룬다. Fisherface 얼굴인식 방법은 주성분 분석 기법만을 이용하는 경우에 비해 조명의 방향, 얼굴의 포즈, 감정과 같은 변동에 대해 민감하지 않은 장점을 가지고 있다. 그러나, Fisherface 방법을 포함한 얼굴인식의 다양한 방법들은 입력 벡터가 한 클래스에 할당되어질 때 그 클래스에서 소속의 정도를 0 또는 1로서 나타낸다. 따라서 이러한 방법들은 얼굴영상들이 조명이나 보는 각도로 인해 변형이 생기는 경우에 인식률이 저하되는 문제가 있다. 본 논문에서는 PCA에 의해 변환된 특징벡터에 퍼지 소속도를 할당하는 것으로, 퍼지 소속도는 퍼지 kNN(k-Nearest Neighbor)으로부터 얻어진다. 실험 결과 ORL, Yale 얼굴 데이타베이스에서 기존의 인식방법 보다 향상된 인식 성능을 보임을 알 수 있었다. In this study, we deal with face recognition using fuzzy-based Fisherface method. The well-known Fisherface method is more insensitive to large variation in light direction, face pose, and facial expression than Principal Component Analysis method. Usually, the various methods of face recognition including Fisherface method give equal importance in determining the face to be recognized, regardless of typicalness. The main point here is that the proposed method assigns a feature vector transformed by PCA to fuzzy membership rather than assigning the vector to particular class. In this method, fuzzy membership degrees are obtained from FKNN(Fuzzy K-Nearest Neighbor) initialization. Experimental results show better recognition performance than other methods for ORL and Yale face databases.
α-Phenyl-N-iso-propylnitrone 유도체에 대한 Potassium Cyanide의 친핵성 첨가반응 메카니즘과 반응 속도론적 연구
이광일,곽천근,장병만 경기대학교 1995 論文集 Vol.37 No.-
The rate constant of the nucleophilic addition of potassium cyanide to α-phenyl-N-iso-propylnitrone derivatives were determined at various pH and a rate equation which can be applied over wide pH range is obtained. Final product of the addition reaction was α-cyano-p-phenylbenzyliden-N-iso-propyl amine. Base on the rate equation, general base effect, substituent effect and final product, plausible mechanism of addition reaction have been proposed. Below pH 3.0, the reaction was initiated by the addition of netural hydrogen cyanide, and in the range of pH 3.0-10.0, proceeded by the competitive addition of hydrogen cyanide and cyanide anion. Above the pH 10.0, the reaction proceeded through the addition of cyanide anion.