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CDMA IMT-2000 시스템의 음성부호화기 성능 평가
김재원 경주대학교 정보전자기술연구소 2002 情報電子技術論叢 Vol.1 No.-
The efficient speech coders are required for spectral efficient mobile communication systems such as CDMA IMT-2000 system. These coders have to provide the good speech quality with low bit rate. The G. 729 was accepted as 8kb/s toll quality speech coding algorithm by ITU-T. For radio communication application, the G.729B with discontinuous transmission scheme was developed. This algorithm can be operated based on voice activity detection and discontinuous transmission. For IS-95 compatible system, the continuous transmission may be required. I will proposed the variable rate speech coding algorithm through classification of speech frame as voice, unvoice and silence frame. I explain these speech coding algorithms briefly and evaluate the performance by speech quality and bit-rate criterion.
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金才媛,宋熙昇 고려대학교 의과대학 1973 고려대 의대 잡지 Vol.10 No.3
The U wave of the electrocardiogram was recognised about 60 years ago by Einthoven, but little attention has been payed in clinical electrocardiography, and its significance was not clear. During the last 30 years, number of reports has appeared in which changes of the U wave was found to be the chief clue leading to the correct diagnosis. However, the reports of clinical significance and genesis of U wave were controversial. Author analysed electrocardiograms of 288 cases of normal persons, 406 cases of hypertension and 212 cases of pre-and postexercise electrocardiogram(normal person 158 cases. angina pectoris 22 cases, hypertension 25 cases, diabetes mellitus 7 cases) and following results were obtained ; A. U-waves in normal persons. 1. Incidences of measurable U wave (higher than 0.2㎜) were 96.6% in unipolar precordial lead, 24.3% in standard lead and 19.8% in unipolar limb lead. 2. Incidence of U wave in standard and unipolar limb lead was higher in female and in prerordial lead were higher in male. 3. Height of U wave were not related with age in both sex. 4. The most prominent U wave in the precordial lead was seen in V₃. B. U waves in hypertension. 1. Negative U wave was seen in 19.7% of hypertension (22.9% of male, 18.8% of female) and most prominent in V_(5). 2. Systolic and diastolic blood pressure was significantly higher in negative U wave group than positive U wave group, and incidence of negative U wave was not related with age. 3. Secondary U wave change (negative U wave secondary to T wave inversion) was 29.8% of hyper-tension and isolated negative U ways was 12.8%. 4. Types of negative U wave in hypertension were negative 48%, diphasic 36% and continuous type 16%. 5. Incidence of high U wave (over 1㎜) in hypertension was significantly higher than that of normal person.
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김재원 경주대학교 정보전자기술연구소 2006 情報電子技術論叢 Vol.5 No.-
CDMA-2000은 광대역 데이터 서비스 제공을 위한 용량 문제 등을 근본적으로 해결하여 고속 데이터 통신이 가능한 동기방식의 이동통신 서비스를 제공하기 위한 시스템으로서 기존 무선 규격에서 데이터 전송 속도와 핸드오프 기능을 향상시키면서 오류정정 기술, 전력 제어기술, 소프트 핸드오프 성능 개선 및 사용자별 파이롯 채널 도입 등으로 제공되는 서비스 품질을 개선할 수 있는 시스템이다, 본 논문에서는 CDMA-2000에서 서비스별 시스템 형상과 서비스를 제공하기 위한 방안을 분석하고자 한다. In addition to technical advances, the trend from speech service and narrow band data service to wideband and packet data service require composite system design. The CDMA-2000 system was introduced for various service needs. The large portion of CDMA-2000 systems are upgraded for good service provisions that could not be supported in legacy mobile communication network. Recently, large part of communication service is based on internet protocol by packet switch techniques and required new technologies such as multimedia processing, QoS achievement, and mobility management. In this paper, I analyzed the network architecture and service provision methods in CDMA2000-1X mobile communication systems. Each service on CDMA-2000 system can be supported by different network elements. I classified service by interaction of network element and described the data How in each service support. By using the analysed results, I will extract an efficient method for network evolution and a core technique for next generation mobile communication network.
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김재원,최영수 대불대학교 2001 論文集 Vol.7 No.1
More importance has been attached to the role of urban planning and policies than the role of economic planning in our society. A local government should be able to enhance abilities to survive in fierce competition with other local cities in terms of urban organization and management capacity according to changes in future circumstances. The local government should predict urban circumstances and develop urban communities in an effort to achieve such objectives. This study is designed to suggest future urban strategics through the classification of some factors affecting urban circumstances and the methods of urban development in urban cities. With this in mind, the study is composed of the following three. First, it deals with the analysis of urban circumstances focusing on physical planning and natural factors. Second, it reexamines the methods of developing cities aimed at the execution of urban planning. Third, it covers the execution of future stages based on the prediction and analysis.
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김재원 대불대학교 2001 論文集 Vol.7 No.1
Most of cities in Korea are using the following method of estimating demands for residential, commercial and industrial land within their urbanization ares: They are putting to use a calculation formula for by-use land areas on the basis of per capita areas required and the scale of the population. But the method above fails to take into consideration the features of indexes presenting the characteristics of cities and is being unanimously applied to most of the cities. Accordingly, this study have extracted factors related to areas in use on the basis of various kinds of city composition materials, calculating models designed to estimate demands for land use with those factors as variables. Residential areas turned out to be subjected to the greatest differences in the areas of land in use, while commercial and residential areas turned out to make few differences. And the findings show that the areas of residential regions are most influenced by the exterior factors of cities in urban planning and that it is necessary that the areas of residential areas should first be expanded for the cause of the artificial development of cities. And the calculation formula for by-use land areas turned out be appropriate for the calculation of the areas of industrial regions. The models for calculating residential areas should take into consideration the exterior factors of cities as well as urban-organization materials.
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김재원 경주대학교 2003 論文集 Vol.16 No.-
인터넷 서비스의 폭발적 증가, 통신기술의 발전, 세계적인 통신 규제 완화에 따른 신규 통신사업자 등장 등 다양한 통신환경의 변화로 인하여 기존 음성 위주의 서비스 사업자는 신규 서비스의 수용, 노후화된 통신장비의 효율적 대체, 운용 유지비의 최소화를 위한 다각적인 검토가 수행되고 있다. 이러한 통신시장의 변화를 수용하기 위해서는 고속의 전송속도에 근거한 다양한 서비스 제공과 아울러 인터넷 응용에 기반한 다양한 서비스들이 제공되어 기존의 공중 유무선 통신망의 서비스 제한성을 탈피한 고품질의 서비스의 제공이 요구된다. 이러한 고속통신을 수용하기 위해서는 신호처리 기술, 광대역 전송기술, 첨단 유무선 통신망 구축 기술이 필수적이다. 본 논문에서는 개방형 구조에 근거한 유선망의 차세대 네트워크의 개념과 통신 사업자, 통신망 설비의 제조업체들의 망 구성 동향을 고찰하고, 이동통신망의 동기방식 CDMA2000, 비동기방식 WCDMA 기술 등에 의하여 서비스 예정인 3세대 이동통신망의 차세대 이동통신망으로의 발전 방향과 구조를 분석하고자 한다. According to tremendous increase of internet service requests, advance of telecommunication technology, and advent of CLEC company, ILEC land telecommunication company with revenues based on voice service must introduce network capability for new services and service quality upgrade. In addition to current of land communication markets, mobile communication services also require service paradigm change from narrow band speech and data to wideband data and multimedia. For the purpose of satisfaction on market need, new communication systems should be installed and upgraded based on a wide-band transmission facility. Recently, large part of communication service is based on internet protocol by packet switch techniques and required new technologies such as multimedia processing, QoS achievement, and mobility management. In this paper, I analyzed the network architecture based on open network architecture of public land and mobile networks and try to conclude evolution direction and structure of next generation land and mobile convergence networks.
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김재원 한국직업능력개발원 2003 직업능력개발연구 Vol.6 No.1
This paper examines various aspects of work altitude including career after graduation, preparation concerning future career and work attitude of college students. The sample is based on students who took the class of Work and Occupation. The results reveal that students do not have a succinct goal for their career development. Concerning marriage the new generation seem to have more progressive ideas compared to old generation. The survey reveals that even for the senior students preparations for career are not sufficient. Comparing the degree of preparation, male students are better than female students in the area of fob search, English and documentation for various fob application forms, while female students are better prepared In the area of coordination and make-up for job interview, implying that overall preparation is better for male students compared to female students. Also the survey shows that college students prefer leisure than work and do not want to work more than co-workers. They respond that the purpose of work is to enjoy life rather than self realization or social contribution. In comparison with the comparable survey for Japanese newly hired workers in 1991 , we find that Japanese young generation in general show higher motivation to work, especially retired age to work Is longer than
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