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최명수,박남철,박형준,김경호,이성로 목포대학교 정보산업연구소 2000 情報産業硏究誌 Vol.8 No.-
The use of the Internet is much increased and the multimedia data such as voice and image should be processed in the Internet. The required characteristics of the communication networks for the 21-st century Internet are the fusion between communications and broadcasting, high speed, large capacity, high intelligence, and personalization. In realizing the characteristics mentioned above, the ATM is the only technique that can practically guarantee QoS and is the core technique in super high-speed service networks. In this paper, we will investigate the international study of the high-speed the satellite communication and then research plans for developing and providing optimum application services.
최명수,박형준,박남철,김경호,이성로 목포대학교 정보산업연구소 2000 情報産業硏究誌 Vol.8 No.-
In this paper, we first define 4th-generation multimedia systems that play an important role in 21C information society. Nest, we investigate and analyze the international trend of the related research and then predict the evolutionary model for 155Mbps wireless mobile multimedia systems.
김수경,최선영 가톨릭대학교 생활과학연구소 1999 생활과학연구논집 Vol.19 No.1
The purpose of this study is to investigate the design elements to design functional and creative clothing for preschool children emphasizing the physical, psychological and aesthetic developments. Data were collected from 262 mothers of 2∼7 aged children, residing Pucheon and Seoul. The results of empirical studies were summarized as follows: 1) The clothing aspects considered important by mothers, in order of freqency, were: utility, price, child's attitude, comfort, symbolic, brand, fashionability, design. 2) Children's mothers considered more important, easiness for the child to put on and take off, the amount of clothing necessary for comfortable temperature, comfort of clothing rather than design and fashionability for children's kindergarten life. Mothers seem satisfactory about children's uniform at kindergarten. 3) Preschool children like some aspects of clothing. These were, in order of importance, were: color, activity, cartoon character, texture, prettiness, decoration detail
李鍾洙,崔京三 弘益大學校 1990 弘大論叢 Vol.22 No.2
In this paper, we propose a new manipulator control scheme based on the CMAC neural network. The proposed control consists of two components. The feedforward component is an output of trained CMAC neural network and the feedback component is a modified sliding mode control. The CMAC accepts the position, velocity and acceleration of manipulator as input and outputs two values for the controller: One is the nominal troque used for feedforward compensation(M1 network) and the other is the intertia matrix related information used for the feedback component(M2 network). Since the used control algorithm guarantees the robust trajectory tracking in spite of modeling errors, the CMAC mapping errors due to the memory limitation are little worth consideration.
문수연,최영실,박미연,이정아,정미경,정혜숙,정두련,송재훈,백경란 대한감염학회 2009 감염과 화학요법 Vol.41 No.3
Q fever is a zoonosis caused by Coxiella burnetii, Presenting as acute and chronic illness and it has been reported worldwide. Acute Q fever is usually asymptomatic or mild and self-limiting, but infective endocarditis is one of the most serious complications of chronic Q fever and can be fatal. Known risk factors for Q fever endocarditis are valvular heart disease, immunocompromised hosts, and pregnancy. There have been some reports on Q fever in Korea but there exists no report on Q fever endocarditis. We have experienced 2 cases of Q fever with underlying valvular heart disease; both Patients came to the hospital for evaluation of prolonged fever. Although Q fever and Q fever endocarditis are rare in Korea, Q fever endocarditis should be considered in the differential diagnosis of patient with infective endocarditis when causative microorganism cannot be identified.
A Hybrid Control Algorithm for the Direct Drive Robotic Manipulators
李鍾洙,崔京三 弘益大學校 1989 弘大論叢 Vol.21 No.2
본 논문에서는 직접 구동 팔의 효율적인 경로 제어를 위해 이산 제어 성분과 연속 제어 성분의 두 가지가 혼합된, 새로운 하이브리드 제어 방식을 제안한다. 이산 제어 성분은 로보트 팔의 근사적 추정 모델을 이용하여, 로보트의 규정경로를 따라 계산하는 규정 토오크로서, 로보트의 동력학 정보를 계산하기 위해 필요한 많은 계산 시간을 고려하여, 큰 표본 시간을 갖도록 한다. 이 제어 입력은 로보트 관절들간에 상호 작용하는 강한 결합 토오크를 근사적으로 보상한다. 연속 제어 성분은 가변 구조 제어 이론을 변형한 제어 입력으로서, 모델링 오차나 작업부하의 변화에 따른 외란 등에 강하게 대처하여 경로 추적의 정학성을 높일 수 있도록 한다. 최근의 제어기 개발 추세에 따라 제안한 알고리즘을 디지탈 제어로서 실현할 경우 '연속 제어 성분은 이산 제어 성분에 비하여 매우 작은 계산량 만을 필요로 하므로, 두 가지의 서로 다른 표본 시간을 갖는 이산 제어 형태로서 구현할 수 있음을 보였다. 제어 시스템의 안정성을 증명하였으며, 제안한 알고리즘의 효용성을 보이기 위하여 작업 부하 오차, 모델링 오차 및 계산에 의한 제어 입력의 시간 지연을 고려하여 3자유도의 직접 구동 로보트 팔에 대하여 시뮬레이션 하였다.
박남철,최명수,박형준,김경호,이성로 목포대학교 정보산업연구소 2000 情報産業硏究誌 Vol.8 No.-
The Location-Informing service is based on the GPS data from the satellite. Until now, the service has been free. However, it may become charged. Therefore, we research the methods that can find the location-information using the antennas in future mobile communication systems and investigate the signal arrival direction estimation methods with considering practical environments.