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Kalman 알고리즘에 의한 대역분할. 합성형 어댑티브 어레이 안테나의 동작 특성
박재성,오경석,주창복,박남천,정주수 한국정보통신학회 1999 한국정보통신학회논문지 Vol.3 No.3
이동체에서 어댑티브 어레이 안테나를 사용하는 경우 가중계수벡터를 전파 환경의 변화에 고속으로 적응시킬 필요가 있다. 4소자 등간격 선형 어레이 안테나 시스템에 있어서 일정 진폭의 포락선을 갖는 BPSK신호나 BFSK 신호에 대하여 신호의 자기상관성을 향상시켜 주므로서 효과적인 다중 간섭파를 제거할 수 있는 대역분할 합성법에 의한 신호처리 기법을 보고한다. 본 논문에서는 S/I=2, S/N=10인 BPSK 신호에 대하여 대역분할ㆍ합성형 신호처리 기법을 LMS 및 Kalman 알고리즘에 적용한 컴퓨터 시뮬레이션 결과 대역분할ㆍ합성형 기법을 사용하므로서 알고리즘의 수렴성이 빠르고 신호의 추종성이 매우 뛰어남을 확인 할 수 있었다. At the mobile unit for adaptation the propagation environment, it is necessity to adapt very fast the weight coefficient vector of adaptive array antenna In this paper, for the BPSK and BFSK signals with S/I=2, S/N=10 subband adaptive array signal processing method to the linear array antenna using the LMS & the Kalman filter algorithm is proposed. For the 4 elements equidistance linear array antenna systems LMS and Kalman algorithms with subband adaptive instruction principles using the subband signal processing method are adopted and the computer simulation results to the constant amplitude envelope signals such as BPSK or BFSK can be seen that the convergence characteristics of directional patterns and the signal following characteristics are more fast and stable.
OSI 관리 기술을 이용한 CORBA 트래픽 모니터링 프록시 설계
박재성,송왕철 한국정보통신학회 1999 한국정보통신학회논문지 Vol.3 No.2
시스템 관리 영역의 한 부분인 트래픽 모니터링은 시스템의 상황을 파악하는데 있어서 매우 중요하다. 현재 CORBA 표준화를 담당하는 OMG에서는 CORBA 시스템 관리의 표준화를 진행 중에 있으며, 많은 회사와 연구소들은 필요에 의해 CORBA에서의 시스템 관리에 대해 개발하고 연구하고 있다. 본 논문에서는 표준화된 OSI 관리 방식을 통하여 CORBA 트래픽 모니터링을 하기 위한 프록시를 설계하였다. 이를 위해, CORBA 자원을 관리하기 위한 6개의 파리미터를 정의하고, 이들을 관리객체로 만들었다. 본 논문에서 모니터링 시스템의 구성은 CORBA 서버, 프록시 객체, 고리고 MIB로 되어 있다. CORBA 서버는 서비스 제공자, 프록시 서버, 그리고 이벤트 서버로 구성되었다. 프록시 객체는 CORBA 객체인 프로세스로 작동을 하며, 프록시 클라이언트, 이벤트 클라이언트, IPC 서버로 구성되었다. Traffic monitoring, a part of the system management, is a vital function lot the proper operation of a system in use. Currently OMG has been trying to standardize CORBA system management. Besides, many companies and research laboratories have been developing and studying CORBA system management. In this paper, we have designed the proxy to monitor the CORBA traffic using the OSI management technology. To manage CORBA traffic resources, 6 parameters have been made into managed objects. The monitoring system consists of a CORBA server, a proxy object and an MIB. The CORBA server is made up of a service provider, a proxy server, and a event sewer. The proxy object acts as a process of a CORBA object, and is made up of a proxy client, a event client, and an IPC server.
부산시 개원 의사와 개국 약사의 의약분업 정책목적 달성도와 손익에 대한 인식도
박재성,남은우,권영철 한국보건행정학회 2001 보건행정학회지 Vol.11 No.4
The purpose of this study was to identify health care providers' perceptions about the goal achievement and benefit/loss caused by the separation policy of drug prescribing and dispensing after the policy implemented on July 1, 2001. Uslng stratified sampling method based on the administration area, Ku, 315 physicians and pharmacists were sampled from the rosters of physician and pharmacist association in the city of Busan on 2001. There were 122 and 115 responses from physician and pharmacist sample, respectively. 78.3% of physicians and 50.4% of pharmacists evaluated that the goal of the policy was not achieved. Moreover, 75.3% of physicians and 40.7% of pharmacists did not support the policy. Most physicians and pharmacists considered preventing the citizens with drug abuse and misuses as the most important benefit derived from the policy. However, physicians and pharmacists concerned over raising health care cost that could be patients' burden. The most important physicians' benefit derived from the policy was free choice of all possible medicine that might result in effectiveness of medication. In physicians' the most important loss, most physicians worried about that breaking traditional patient and physician relationship might cause physicians' authority in treating diseases to be damaged. Pharmacists considered the most important policy benefit as hiked social status resulted from enforcement of profession due to the policy whereas they considered the most significant loss as expected financial problems of small pharmacies compared to that of large pharmacies or pharmacies adjacent to hospitals. In the current problems of the policy, physician and pharmacists blamed the government for inadequate preparations of the policy implementation. Physicians and pharmacists also considered citizens' mature attitudes toward the policy as a crucial success factor.
박재성,이영신 (사)디지털산업정보학회 2016 디지털산업정보학회논문지 Vol.12 No.3
Mechanical properties of Y2O3-containing tetragonal ZrO2 polycrystals(Y-TZP) were investigated. Several additives were used to modify the hardness and fracture toughness of Y-TZP. The effects of these individual additives were discussed and their interactions were also analysed. Each additive, such as CoO, Fe2O3, MnO2 was found to deteriorate the mechanical properties of Y-TZP when it was used singly. But the fracture toughness of Y-TZP was significantly improved when these additives and Al2O3 were added in combination at a certain ratio. The addition of CoO, Fe2O3 and MnO2 into Y-TZP resulted in the more complex behavior of fracture toughness and hardness. The specimen with 1.5 wt%-Fe2O3, 3.0 wt% -Al2O3 and 1.5 wt%-CoO showed the monoclinic to tetragonal phase ratio of 18% and the highest toughness of 10.8 MPaㆍm1/2 with Vickers hardness of 1201 kgf/mm2. However, the toughness decreased as the ratio increased and macrocracks developed beyond the ratio of 25%. Sample No. 16 is improved high Physical and Mechanical Properties.
Integrated DC-DC Converter Based Energy Recovery Sustainer Circuit for AC-PDP
박재성,신용생,홍성수,한상규,노정욱 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.6
A new sustainer with primary-side integration of DC/DC converters and energy recovery(SPIDER) circuits is proposed. The proposed circuit operates as a DC-DC converter during address period and energy recovery circuit during sustain period. Therefore,the conventional three electronic circuits composed of the power supply, X-driver, and Y-driver can be reduced to one circuit. As a result, it has desirable advantages such as a simple structure, less mass, fewer devices and cost reduction. Moreover, since the Zero Voltage Switching (ZVS) of all power switches can be guaranteed, a switching loss can be considerably decreased. To confirm the operation, validity, and features of the proposed circuit, experimental results from a prototype for 42-inch PDP are presented.