컨포멀 위상 배열 안테나의 패턴 합성에 대한 고찰

박동철(Dong-Chul Park),권오혁(Oh-Hyuk Kwon),류홍균(Hong-Kyun Ryu),이규송(Kyu-Song Lee) 한국전자파학회 2015 한국전자파학회논문지 Vol.26 No.12

본 논문에서는 Enhanced Adaptive Genetic Algorithm(EAGA)를 이용하여 두 가지 종류의 컨포멀 배열 안테나의 패턴합성 과정을 기술하였다. 한 종류는 2차 함수 형태의 실린더 도체 위에 배열된 1×16 배열 안테나이고, 다른 종류는 2차함수 곡선의 회전체 곡면 도체 위에 배열된 18개 소자 배열 안테나이다. 패턴 합성시 각 소자의 능동 소자 패턴을 이용하였고, 특히 회전체형 배열 안테나의 경우, 합성 시간을 크게 줄이기 위해 동심원형 평면 배열 안테나의 능동 소자 패턴을 구한 뒤 이를 변환하여 사용하였다. 제안한 합성 기법의 타당성을 검증하기 위해 MATLAB 내에서 합성된 배열 안테나의 패턴과 MWS(Microwave Studio) 내에서 구현된 배열 안테나의 패턴을 비교하였으며, 또한, 1×16 배열 안테나의 경우는 측정 패턴과 합성 패턴도 비교하였다. This paper describes the pattern synthesis method of two kinds of conformal array antenna using the Enhanced Adaptive Genetic Algorithm (EAGA). One is the 1×16 conformal array antenna on a curved cylindrical metallic surface with quadratic function, and the other is the 18-element conformal arrary antenna on a metallic surface obtained by the rotation of a quadratic function curve around the axis. The active element pattern is utilized in the pattern synthesis. Especially for the case of the rotated-type conformal array antenna the transformed active element pattern obtained from the Euler’s angle rotation of the active element pattern of the planar concentric array is utilized, which reduces the synthesis time a lot. To verify the validity of the proposed synthesis method the MATLAB results are compared with the MWS results. Furthermore, for the case of 1×16 conformal array antenna the measured results are compared with the MATLAB synthesized results.

금수육군전(金水六君煎)이 알러지항원의 혈관투과성에 미치는 영향

전종철,정문수,이성도,박동일,Jeon, Jong-Chul,Jung, Moon-Soo,Lee, Sung-Do,Park, Dong-Il 대한한방내과학회 2006 大韓韓方內科學會誌 Vol.27 No.1

Kyumsuyukgun-jun has been used for the chronic bronchitis, asthma and other illnesses. This study was carried out for the purpose of determining what effect KS has against allergic inflammatory reaction. The results obtained was that KS had inhibitory effects of following administration routes on PCA in rats. According to the above results, KS is beneficial against allergic inflammatory reaction through inhibition of PCA.

새로운 무감독 경쟁 학습 알고리즘의 개발

박동철(Dong-Chul Park) 한국지능시스템학회 1999 한국지능시스템학회논문지 Vol.9 No.2

유전체 도파관 격자를 이용한 대역통과 필터의 설계

박동철(Dong Chul Park) 대한전자공학회 1985 대한전자공학회 학술대회 Vol.1985 No.6

다단계 특징벡터 기반의 분류기 모델

박동철(Park Dong Chul),송영수(Song Young Soo),김재영(Kim Jae Young) 한국통신학회 2007 한국통신학회 학술대회논문집 Vol.2007 No.11

자동차 소음/진동 개발동향 및 발전과제

박동철(Dong Chul Park) 한국자동차공학회 2011 오토저널 Vol.33 No.4

Homogeneous Centroid Neural Network에 의한 Tied Mixture HMM의 군집화

박동철,김우성,Park Dong-Chul,Kim Woo-Sung 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.9C

음성인식에서 TMHMM(Tied Mixture Hidden Markov Model)은 자유 매개변수의 수를 감소시키기 위한 좋은 접근이지만, GPDF(Gaussian Probability Density Function) 군집화 오류에 의해 음성인식의 오류를 발생시켰다. 본 논문은 TMHMM에서 발생하는 군집화 오류를 최소화하기 위하여 HCNN(Homogeneous Centroid Neural Network) 군집화 알고리즘을 제안한다. 제안된 알고리즘은 CNN(Centroid Neural Network)을 TMHMM상의 음향 특징벡터에 활용하였으며, 다른 상태에 소속된 확률밀도가 서로 겹쳐진 형태의 이질군집 지역에 더 많은 코드벡터를 할당하기 위해서 본 논문에서 새로 제안이 제안되는 이질성 거리척도를 사용 하였다. 제안된 알고리즘을 한국어 고립 숫자단어의 인식문제에 적용한 결과, 기존 K-means 알고리즘이나 CNN보다 각각 14.63%, 9,39%의 오인식률의 감소를 얻을 수 있었다. TMHMM(Tied Mixture Hidden Markov Model) is an important approach to reduce the number of free parameters in speech recognition. However, this model suffers from a degradation in recognition accuracy due to its GPDF (Gaussian Probability Density Function) clustering error. This paper proposes a clustering algorithm, called HCNN(Homogeneous Centroid Neural network), to cluster acoustic feature vectors in TMHMM. Moreover, the HCNN uses the heterogeneous distance measure to allocate more code vectors in the heterogeneous areas where probability densities of different states overlap each other. When applied to Korean digit isolated word recognition, the HCNN reduces the error rate by 9.39% over CNN clustering, and 14.63% over the traditional K-means clustering.

치마버섯에서 이형 유전자 발현에 관한 연구

박동철,김현정,김옥미,배준태,박선희,이병훈,이갑랑 ( Dong Chul Park,Hyun Jeong Kim,Ok Mi Kim,Jun Tae Bae,Sun Hee Park,Byeung Hun Lee,Kap Rang Lee ) 한국균학회 1998 韓國菌學會誌 Vol.26 No.1

분산커널 기반의 퍼지 c-평균을 이용한 음악 데이터의 장르 분류

박동철(Dong-Chul Park) 대한전자공학회 2009 電子工學會論文誌-CI (Computer and Information) Vol.46 No.3

본 논문은 효율적인 음악 데이터의 분류를 위한 방법으로 분산커널 기반의 퍼지 c-평균을 이용한 분류기 모델을 제안한다. 분산 커널 기반의 퍼지 c-평균은 주어진 오디오 데이터에서 추출된 특징벡터의 평균과 공분산 정보를 동시에 이용하여 기존의 평균값만을 사용하는 방식에 비해 성능을 월등히 향상시킬 수 있는 장점이 있다. 사용된 방식은 확률적 분포로 주어지는 데이터 사이의 거리를 분산거리척도로 측정하고, 복잡한 분류 경계를 단순화 시키는데 효율적인 커널 개념을 사용함으로서 분류의 정확도를 극대화 시킬 수 있는 장점이 있다. 제안하는 분류기의 성능을 평가하기 위하여 고전음악, 컨트리음악, 힙합, 재즈의 4개의 장르 음악데이터를 총 1200개 수집하여 실험을 진행하였다. 실험의 결과 제안된 분산커널 기반의 퍼지 c-평균을 이용하는 분류기는 기존의 방식과 비교하여 분류정확도에서 평균적으로 17.73% - 21.84%의 성능향상을 보여준다. An approach for the classification of music genres using a Fuzzy c-Means(FcM) with divergence-based kernel is proposed and presented in this paper. The proposed model utilizes the mean and covariance information of feature vectors extracted from music data and modelled by Gaussian Probability Density Function (GPDF). Furthermore, since the classifier utilizes a kernel method that can convert a complicated nonlinear classification boundary to a simpler linear one, the classifier can improve its classification accuracy over conventional algorithms. Experiments and results on collected music data sets demonstrate that the proposed classification scheme outperforms conventional algorithms including FcM and SOM 17.73% - 21.84% on average in terms of classification accuracy.

북한(北韓)의 대외경제개방(對外經濟開放) 추세(趨勢)와 전망(展望)

박동철 ( Dong Chul Park ) 평화문제연구소 1989 統一問題硏究 Vol.1 No.3

The paper mainly analyzes the open-door policy of North Korea economies since North Korea promulgated a joint venture law, on September 8, 1984. The main characteristic of North Korean economic development is called selfreliance for the building of a solid, independent national economy. The main emphasis is on the development of heavy industry, then the development of light industry and agriculture together. This involves building the economy and society with modern technology, relying on and developing the nation`` So resources training specialists and technicians. and maintaining a collective economic system. North Korea has developed its economy in this direction since the 1950s and foreign trade with socialist countries has expanded. In the early 19705, economic exchanges were opened with western countries. In the 1980s North Korean economic strategy has made a turn towards a more active open -door policy the target of creating the most comprehensive economic complex based on the principle of "self-reliance" is being replaced by a. search for more rational ways of involving the country in the international division of labour. The growing role of foreign trade in socialist construction found reflection in the decisions of the sixth W·PK congress (1950). "A rapid development of foreign trade" the congress noted, "is a major prerequisite for boosting the economy." The policy of accelerated development of foreign trade was confirmed by the third session of the North Korea Supreme People``s Assembly (seventh convocation) in 1984. The session stressed the need to build up the country``s export potential and use the external factor to raise the scientific and technological level of production. Implementation of these decisions required restructuring of the mechanism of foreign trade management to centralize management. The Ministry of foreign trade and the North Korean Committee for economic ties were merged in the mid1980s into the committee-for external econornicties, Simultaneously, more fights were given to production associations which began to incorporate foreign trade firms of dual subordination to branch ministers and foreign trade organizations. In 1984, to stimulate foreign investments, North Korea passed a law on joint enterprises, This law makes it possible to set up joint companies in industry, transport, science, technology and tourism with the participation of foreign capital to promote joint ventures with western countries, North Korea has continuously established a series of laws and rules and regulations as follows: ( 1) Detailed rules and regulations for the implementation of the law of Republic of Korea on joint ventures on March 20, 1985. (2) Income tax law of the North Korea on joint companies on March 7, 1985. (3) Detailed rules and regulations of the income tax law of the North Korea on joint companies. (4) Foreigner``s income tax law of the North Korea on March 7, 1985. (5) Detailed rules and regulations of the foreigner income tax law of the North Korea on May 17, 1985. The North Korean objectives of joint ventures law is to introduce the most up-to-date science and technology, improve the quality of products and increase export but it has not been successful in this respect because western countries have not had incentives of the investments in North Korea. So far the very joint ventures have been done with Korean residents in Japan. The ``outlook of the open-door policy in North Korea is, therefore, expected to remain stagnant in the future without any expanding of investment incentives, internal market (demand), market rnachanism, policy problems in North Korea