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병원의 관리개선을 위한 원가개념의 도입과 원가분석전산시스템의 효과분석 : K대학병원의 원가분석시스템을 중심으로
최황규,이열원,윤덕보,오건영,정수경 한국병원경영학회 1996 병원경영학회지 Vol.1 No.1
Some of the large sized companies have taken parts in a hospital business with a view or justification to improve medical care regadless of the disadvantageous fee-for-service medical insurance reimbursement system controlled by authorities related. This gradually brought about the financial difficulties to university hospitals as well as general hospitals that were less competitive. In this circumstance the hospital administrators are called for preparing and implementing proper financial strategies by analyzing external circumstances and internal abilities of their hospitals. In this aspect, an effective cost-analysis system in the hospital has been needed for years. K-University hospital developed the practical cost-analysis system and applied it to the hospital management. The effects of const analysis system are as belows : first, the trend of the monthly revenue per medical specialist from March to July in 1996 showed increasing pattern which is different from that in past years. second, it turned out that the department of functional laboratory in relation to medical treatment enlarged the medical revenue very sharply. third, the intensive care units were being operated at the state of deficit, while other general wards were lucrative.
DVD 쥬크박스 기반의 계층적 VOD 서버 구성을 위한 파이프라인 로딩 기법
최황규 한국컴퓨터산업학회 2002 컴퓨터産業敎育學會論文誌 Vol.3 No.3
In order to realize a practical VOD system, it is necessary for a high-capacity and cost-effective hierarchical VOD server based on tertiary storages such as DVD jukebox. In such a system, it is possible to transfer multiple streams to users by alternatively swapping DVDs using the fixed number of drives. But it takes a long time for loading DVD to a drive. In this paper, we propose a primitive pipelined loading mechanism for hiding the loading time to swap DVDs in a hierarchical VOD server based on DVD jukebox. We also propose a enhanced pipelined loading mechanism for increasing the maximum admittable streams with the fixed number of drives. The enhanced mechanism caches the initial segment of each stream on a disk storage allowing faster data transfer. The performance analysis shows that the proposed mechanisms can admit the maximum allowed stream capacity under the fixed number of disk drives. 최근 관심을 끌고 있는 VOD 시스템을 현실적으로 실현 가능하게 하기 위해서는 대용량 멀티미디어 정보를 장기적으로 저장할 수 있도록 저가이면서 저장 용량이 큰 3차 저장장치를 사용하는 계층적 VOD 서버를 필요로 한다. 본 논문은 이러한 계층적 VOD 서버를 저가의 대용량 DVD 쥬크박스를 온라인 저장장치로 사용하여 구성하고, 여러 개의 스트림들을 적당한 시간을 주기로 드라이브들을 교대로 활용하게 함으로써 서비스 스트림을 최대화함으로써 효율을 높일 수 있다. 그러나 DVD 쥬크박스 내에서 하나의 스트림이 저장된 DVD-ROM의 교환은 상대적으로 긴 시간을 요구하므로 본 논문에서는 DVD 쥬크박스를 기반으로 한 VOD 서버에서 DVD-ROM의 교환시간을 은폐하면서 효율적인 데이터 전송을 지원 할 수 있는 파이프라인 로딩 기법을 제안한다. 또한 디스크를 캐쉬로 사용하여 스트림의 초기 일부분을 미리 디스크 캐쉬에 적재하여 놓음으로써 최대허용 스트림 수를 증가시킬 수 있는 기법을 제안한다. 제안된 기법들은 시뮬레이션 성능분석을 통하여 파이프라인 상황하에서 사용하는 드라이브 수에 비하여 최대 허용 스트림 수가 크게 증가될 수 있음을 보인다.
데이터 편재 하에서 히스토그램 변환 기법에 기초한 효율적인 병렬 결합 알고리즘
박웅규,최황규 江原大學校 産業技術硏究所 1995 産業技術硏究 Vol.15 No.-
본 논문에서는 데이터 분포가 편재된 상황하에서 부하의 불균형과 버켓 오벌플로우 문제를 해결하기 위해 히스토그램 변환 기법을 이용한 데이터 분산 방법과 이를 기초로한 병렬 결합 알고리즘을 제안한다. 제안된 알고리즘의 성능은 시뮬레이션과 하이퍼큐브형 병렬 컴퓨터 상에서 실험적인 방법에 의하여 분석되었다. 그 결과 제안된 알고리즘이 기본의 해쉬 결합 방법보다 우수함을 보인다.
인터넷상에서 실시간 MPEG 비디오/오디오 및 텍스트 캡션 기능을 제공하는 VOD 시스템의 설계 및 구현
김영진,김근혜,최황규 강원대학교 정보통신연구소 1999 정보통신논문지 Vol.3 No.-
In this paper, we present the design and implementation of an Internet-based VOD system. The system can play the MPEG video/audio and text captions on the Internet environment is real time. The software feedback mechanism is adopted for client/server synchronization, QoS control, and system adaptiveness. Currently, our system is well running on the Internet environment in real time.
디스크 배열 기반의 주문형 비디오 서버에서 효율적인 VCR 기능 지원을 위한 디스크 부하 균등 기법
최황규,김근혜 강원대학교 정보통신연구소 1999 정보통신논문지 Vol.3 No.-
In a VOD system, it is desirable to provide the user with interactive VCR functions such as fast-forward and fast-backward. Typically, these functions can be implemented usding segment interleaving in disk array based VOD servers. But the segment interleaving may not ensure QoS of users because of the concentrated load within some disks. In this paper, we propose and efficient load balancing technique for evenly distributing the retrieval requests across the disks. The proposed technique maintains a frequency counter in each disk, which has a number of disk accesses. The fast-forward can be achieved by choosing a segment to be accessed from the disk with a minimum number in frequency counter. We conduct the simulation experiment and then show that our proposed technique outperforms the previous ones.
캐쉬를 이용한 RAID5상에서 작은 쓰기 문제의 성능 분석
최황규,서주하,이승택 江原大學校 産業技術硏究所 1995 産業技術硏究 Vol.15 No.-
In this paper we evaluate the performance of the cached RAID5 which uses the parity cache and the data cache to overcome the small write problem. From the result of the simulation study we show that the cached RAID5 provides performance improvement with reasonable cache size.
전기차 충전설비에 있어서 도로교통량 데이터를 기반으로 한 충전수요예측 모델 연구
최황규(Hwang Kyu Choi),김광호(Kwang Ho Kim) 한국조명·전기설비학회 2022 조명·전기설비학회논문지 Vol.36 No.1
In order to efficiently build and operate an electric vehicle charging infrastructure in response to the rapidly increasing electric vehicles, it is necessary to accurately predict the electric vehicle charging demand. In this study, we set the road traffic as a major factor in determining electric vehicle charging demand and propose the electric vehicle charging demand forecasting model based on the road traffic. The proposed model suggested in this research primarily predicts the traffic volume of the neighboring area, especially adjacent roads where the charging station is located, and estimates the number of electric vehicles and their charging demand by using the relevant electric vehicle statistics and the historical charging data. As a result of simulated verification of the proposed model for the expressway rest area (Jukam rest area, Seoul direction), it shows an accuracy of 2-3% and is expected to be used as one of the traffic-based models in predicting electric vehicle charging demand.
ATM네트윅과의 접속을 위한 MAN을 이용한 사용자 - 망 인터페이스 설계
최황규,최경,서주하,김화종,이상희 江原大學校 産業技術硏究所 1991 産業技術硏究 Vol.11 No.-
In this paper the functional requirements of a B-ISDN access network based on MAN are investigated . Firstly, criteria of designing access network for the B-ISDN is studied. Secondly, the types of subscribers and their service requirements are defined. Thirdly, various artchitectures of CPNs(Customer Premises Networks) are considered and their characteristics are studied, Finally, the interworking funtions of a DQDB MAN as an access network are investigated.