An Object-Oriented, Client-Server Architecture for a Generalized Multimedia a Processing Model in a Distributed Multimedia System

김두현,임영환,Kim, Doo-Hyun,Lim, Young-Hwan 한국정보처리학회 1996 정보처리학회논문지 Vol.3 No.1

본고는 분산 멀티미디어 시스템 환경에서 여러가지 응용 서비스를 지원하기 위한 범용 멀티미디어 데이타 처리 모델을 제시하고 그것을 구현하기 위한 객체지 향, 클 라이언트 서버 구조에 대하여 기술하였다. 이 모델은 분산 멀티미디어 시스템에서 필 요한 원격 데이타의 이용을 위한 통신망 투명성과 실시간 멀티미디어 입출력, 그리고 미디어의 통합이나 동기화 등의 멀티미디어 처리를 지원하는 범용 모델이다. 이 모델 은, 스트립 계층, 멀티미디어 프리젠테이션 계층, 하이퍼 프리젠테이션 계층등으로 구 성된다. 본 고는 이 모델의 각 계층에 해당되는 추상적인 데이타개념을 정의하고 이것 이 각 계층의 서비스와 실재로 객체지향 기법으로 제공되는 AP(Application Programming Interface)가 어떻게 연결되는지 기술하였다. 그리고 실제 구현하기 위한 구체적인 문제 를 예를 들면서 다루었고 마지막에 추후 연구해야 할 방향을 제시하며 결론을 맺었다. In this paper, we describe a multimedia data processing model that supports wide variety of applications based on multimedia production model. This model supports network-transparent access to stored multimedia data, real-time mult media input devices, and multimedia processing. The model addresses real-time dato a switching and delivery, as well as acquisition, processing, and output. Most translation, compression, and synchronization services are integrated. This model consists of three layers: (1) stream, (2) multimedia presentation, (3) hyperpresentaion. This paper describes the data abstractions associated with each layer. These data abstractions provide a framework for defining the services provided by each layer, and describe the object-oriented mechanisms that provide those services. A sample scenario is presentated to illustrate the use of this model. A server-client architecture and implementation issues, and future directions are also discussed. sed.

국회보안강화를 위한 법규개정방안에 관한 연구

김두현,정태황,최병권,Kim, Doo-Hyun,Chung, Tae-Hwang,Choi, Byung-Kwon 한국경호경비학회 2011 시큐리티연구 Vol.- No.26

국회는 가급 국가중요시설로 내 외적인 위협으로부터 안전하게 보호되어야 하는데, 국회의 보안강화를 위해 법적 제도적 개선방안이 필요하다. 본 연구는 국회 경호업무 강화와 경호업무의 법치주의 실현을 위한 국회 경호관계법 개선방안을 다음과 같이 제안하고자 한다. 첫째, 경호업무의 범위를 회의장의 질서유지, 국회건물의 시설경비, 중요인사의 신변보호 등의 안전활동을 포함하고 경위의 경호활동 권한을 부여할 수 있도록 규정하는 것이 필요하다. 둘째, 현재의 경호조직을 '경호국' 하부 조직으로 하고 하부조직을 신변보호과, 시설경비과, 질서유지과, 종합상황담당관으로, 1국 1담당관 3과로 조직체계를 개선하여 경호지휘체계 단일화를 취하고, '경호업무'에 대한 용어정의를 명확하게 하는 것이 필요하다. 셋째, 방청인 신체검사 기능 및 국회 안에서의 현행범 체포에 대한 현실적인 상황을 고려하여 불필요한 조항은 삭제하고, '회의장의 질서를 문란하게 하는 행위를 하거나 하려고 하는 때', '경위로 하여금' 퇴장시킬 수 있게 개정하는 것이 필요하다. 넷째, 경위의 경호활동에 대한 실효성을 강화하기 위하여 국가기관 등에 대한 협조요청, 경위의 사법경찰권, 무기 휴대 및 사용, 제복 및 장비 등에 대한 규정이 필요한데, 경호처, 경찰, 청원경찰, 특수경비원 등의 활동권과의 비례성을 고려해 볼 수 있다. This study is to propose the improvement of security related regulations to reinforce security activity and actualize constitutionalism in the National Assembly. For the purpose, some improvements could be considered as followings; First, legislating of regulations including some articles on the scope of security activity such as order preservation at assembly hall, facility security, security agents' right and protection of personal is necessary. Second, changing the organization and command system of security management is necessary for the unification of security activity and efficiency of the job. Also clear definition of terminology on the security job is need. For the shake of above object, one officer in charge of situation management and three section such as the personal protection section, facility security section and order preservation section could be substructured under security department. Third, elimination of unnecessary article on the arrest of red handed criminal in the assembly hall and on the physical checkup of audience by security agent is need. Also legislating of regulations on the hoarding of person who could disorder is necessary. Forth, legislating of regulations on the cooperation with government branch, judicial police power, carry and use of weapon and uniform and equipment to reinforce practical efficiency of security activity. For the proper legislating of the regulations, comparition with other public organizations such as presidential security Service, police, private security could be considered.

남${\cdot}$북한의 국가원수 경호조직에 관한 연구

김두현,Kim, Doo-Hyun 한국경호경비학회 1997 시큐리티연구 Vol.- No.1

I study on the security organization for the chief of state in North and South Korea. The paper, purporting to analyze security system in comparative prospectives, comprise four chapters. Chapter I Which sets out purpose, scope and method, is followed by Chapter II , dealing largely with the power structure on The Socialist Constitution of Democratic People's Republic of Korea, the protection organization and security activities for the chief of state in North Korea. Chapter III concerns the security environment - terrorist groups, firearms, explosives, suspects, movements of hostile countries and orthers - and the protection organization on The Presidential Security Service for the president in South Korea, culminating in projection of certain problem area. It is followed by concluding observation made in Chapter IV. To be operated security systems effectively, these need to be regulated according to a protective scale, function, authority of a existing.

FTA를 이용한 볼트 유도가열시스템의 고장 및 전기화재 분석

김두현,김성철,엄한얼,강문수,정천기,Kim, Doo-Hyun,Kim, Sung-Chul,Eom, Haneol,Kang, Moon-Soo,Jeong, Cheon-Kee 한국안전학회 2021 한국안전학회지 Vol.36 No.4

This paper presents a safety assessment method for FTA-based induction heating systems; the failures and causes of electrical fire are first analyzed for each part and module qualitatively, and methods to manage high probabilities of failure and electrical fire are considered, thereby improving the reliability of the induction heating system. The cumulative importance value (ACC) of the minimal cut set is drawn by setting failure as the top event, and STACK and SMPS are observed to account for about 70% of the induction heating system failures. Thus, intensively managing the basic events contained in the minimal cut set of failures for STACK and SMPS is expected to provide effective and stable operation of the induction heating system. When electrical fire is set as the top event, the STACK percentage is 90%. Accordingly, the current IGBT is changed to a FET to increase the applied voltage and prevent induction heating system failure, and a heat sink plane is installed to prevent FET heating caused by switching, thereby preventing an electrical fire. By classifying the parts and modules of the induction heating system in detail and by applying FTA based on actual failure rates and relevant data, more practical and reasonable results may be expected. Hence, continuous research must be conducted to ensure safety when using induction heating systems.

유도가열시스템의 구성부품에 대한 강건설계

김두현,김성철,이종호,강문수,정천기,Kim, Doo Hyun,Kim, Sung Chul,Lee, Jong Ho,Kang, Moon Soo,Jeong, Cheon Kee 한국안전학회 2021 한국안전학회지 Vol.36 No.2

This paper presents the robust design of each component used in the development of an induction bolt heating system for dismantling the high-temperature high-pressure casing heating bolts of turbines in power plants. The induction bolt heating system comprises seven assemblies, namely AC breaker, AC filter, inverter, transformer, work coil, cable, and CT/PT. For each of these assemblies, the various failure modes are identified by the failure mode and effects analysis (FMEA) method, and the causes and effects of these failure modes are presented. In addition, the risk priority numbers are deduced for the individual parts. To ensure robust design, the insulated-gate bipolar transistor (IGBT), switched-mode power supply (SMPS), C/T (adjusting current), capacitor, and coupling are selected. The IGBT is changed to a field-effect transistor (FET) to enhance the voltage applied to the induction heating system, and a dual-safety device is added to the SMPS. For C/T (adjusting current), the turns ratio is adjusted to ensure an appropriate amount of induced current. The capacitor is replaced by a product with heat resistance and durability; further, coupling with a water-resistant structure is improved such that the connecting parts are not easily destroyed. The ground connection is chosen for management priority.

효율적인 고출력 LED 디밍 제어를 위한 회로 설계 및 구현

김두현,최재호,조범준,Kim, Doo-Hyun,Choi, Jae-Ho,Cho, Beom-Joon 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.9

기존의 고출력 LED의 디밍(Dimming) 제어 방법에는 펄스폭변조, 주파수변조, 아날로그 제어 방법이 있으며, 아날로그 디밍은 순방향 고출력 LED 전류를 조정하는 방법으로 0%~100%의 전 범위에서 선형 밝기 조절이 가능하나 순방향 전류를 변화시킴으로써 파장의 변화가 존재하고, 펄스폭변조 디밍 제어는 고출력 LED에 흐르는 정격 전류의 듀티를 가변하여 조도를 제어하는 방식으로 저 레벨(0%~10%)에서 선형 밝기 조정이 어렵다. 그리고 주파수변조 디밍 또한 저 레벨의 디밍에서 빛이 깜박거리는 문제를 내포하고 있다. 본 논문은 이러한 디밍 방식의 단점을 보완하고자 저 레벨 디밍 제어 시 아날로그 방식을 적용하고, 10%~100%의 디밍 제어 시에 펄스폭변조 방식을 적용하는 효율적인 디밍 제어 회로의 설계 및 구현을 제안한다. 전 범위에 걸쳐 선형 밝기 조절이 가능하고, 다양한 디밍 레벨에서 일정한 파장의 출력이 가능한 디밍 제어 회로를 구현하였으며, 실험 결과는 제안한 방법의 우수성을 보여주고 있다. The conventional dimming control methods of LED (Light-emitting dioades) include Analog, PWM (Pulse Width Modulation), and FM (Frequency Modulation) Control. Analog dimming is controlled by adjusting forward current of Power LED. Although Analog dimming is possible to control linearly the brightness levels on a whole range (0%~100%), it comes into existence a variation of wavelength by changing the Power LED's forward current. PWM dimming has achieved by varying in duty of full current flowing to the Power LED. Generally, PWM dimming doesn't make variation of wavelength but have difficulty with adjusting the linear brightness level between 0% and 10%. FM dimming method is on the same wavelength as PWM dimming, however, it has problem of flickering at low level of dimming. This paper propose a efficient dimming control method of Power LED in order to overcome the disadvantages of the above mentioned methods. We apply to Analog method in low level of dimming control and use PWM method in dimming range from 10% to 100%. For the experiment, we design and implement a circuit and test the proposed method. Consequently, we can control the linear brightness of Power LED across the whole range and get the constant wave at different dimming level. The experimental results show the benefits of the proposed method.

태양광발전시스템의 PCS에서 이상 온도 제어를 위한 하드웨어개발

김두현 ( Doo-hyun Kim ),김성철 ( Sung-chul Kim ),김윤복 ( Yoon-bok Kim ) 한국안전학회(구 한국산업안전학회) 2019 한국안전학회지 Vol.34 No.1

This paper is purposed to develop hardware for controlling abnormal temperature that can occur environment and component itself in PCS. In order to be purpose, the hardware which is four part(sensing, PLC, monitoring and output) keep detecting temperature for critical components of PCS and can control the abnormal temperature. Apply to the hardware, it is selected to PV power generation facilities of 20 ㎾ in Cheong-ju city and measured the data for one year in 2017. Through the temperature data, it is found critical components of four(discharge resistance, DC capacitor, IGBT, DSP board) and entered the setting value for operating the fan. The setting values for operating the fan are up to 130℃ in discharge resistance, 60℃ in DC capacitor, 55℃ in IGBT and DSP board. The hardware is installed at the same PCS(20 ㎾ in Cheong-ju city) in 2018 and the power generation output is analyzed for the five days with the highest atmospheric temperature(Clear day) in July and August in 2017 and 2018 years. Therefore, the power generation output of the PV system with hardware increased up to 4 ㎾h.

가상경계 유한차분 볼츠만법을 통한 2 차원 원형 실린더 주위 유동에 관한 수치적 연구

김두현(Doo-Hyun Kim),정해권(Hae-Kwon Jeong),김래성(Lae-Sung Kim),양희주(Hui-Ju Yang),하만영(Man-Yeong Ha) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11

This paper presents a 2-D numerical simulation of fluid flow around a cylinder using immersed boundaryfinite difference lattice Boltzmann method(IB-FDLBM). This method is a combination and utilizes the most desirable feature of the finite difference lattice Boltzmann method and the immersed boundary method. The FDLBM uses a Eulerian grid for the flow domain and the immersed boundary is represented with a finite number of Lagrangian points. Bluff body wake interference and its effect on drag and lift force are studied. The drag and lift coefficient are compared with previous experimental and numerical results for various Reynolds number.

전기안전분야 : 배선에서의 반단선 및 접촉불량에 대한 열적 전조 DB 구축

김두현 ( Doo Hyun Kim ),김성철 ( Sung Chul Kim ),이종호 ( Jong Ho Lee ),강동규 ( Dong Kyu Kang ) 한국안전학회(구-한국산업안전학회) 2009 한국안전학회지 Vol.24 No.2

효(孝)를 통한 부모의 건강관리에 관한 연구

김두현 ( Doo Hyun Kim ) 한국청소년효문화학회(구 한국청소년문화학회) 2012 韓國의 靑少年文化 Vol.19 No.-

이 논문은 문헌적 연구를 통하여 효를 통한 부모의 건강관리 방안을 연구하여, 이를 실천함으로써 부모의 삶의 질을 향상시켜 보다 행복한 생활을 보장하는데 그 목적이 있다. 현대사회에서는 "효"의 개념은 자녀가 부모 등을 성실하게 부양하고 이에 수반되는 봉사를 하는 것을 말한다. 그동안 부모에 대한 정신적 건강관리에만 치우쳐온 부모에 대한 효행방법을 다음과 같은 질병에 걸리기 전에 예방적 차원에서 신체적 건강을 위한 노력이 필요하다. 첫째, 부모건강의 개념을 정립할 필요가 있다. 둘째, 부모건강의 결정요인을 분석하여 체계적인 교육을 하여야 한다. 셋째, 부모의 건강증진법을 강구하고 건강실천을 위한 사업을 추진하여야 한다. 넷째, 부모비만의 예방과 건강한 신체를 유지하여야 한다. 다섯째, 사회복지차원에서는 부모의 경제적인 원인을 해결하기 위해서는 국민연금제도 및 공적연금제도 확대 등 경제적 환경개선을 통한 복지대책이 강구되어야 한다. 그리고 심리적인 원인을 해결하기 위해서는 갱년기 등 부모심리상담과 치료프로그램 및 시스템을 개발하여야 한다. The purpose of this study which done by the Comparative Study is to secure more happier lives of parents improving their quality of life through implementing the ways to improve parents` health-care with filial piety(Hyo). The definition of filial piety(Hyo) in modern society is for sons and daughters to support their parents with sincerity and do the required services. On top of the traditional ways of filial piety which had been more focused on mental health-care, the efforts on physical healthcare are also critical as follows. First, the definition of parents` health should be reestablished. Second, the critical factors for parents` health should be analyzed and then systematic education should be done. Third, study the ways to keep parents` health in good condition and implement those ways to achieve. Fourth, prevent parents` obesity from happening and maintain good physical condition. Fifth, the measures to improve economical circumstances such as the expansion of National Pension system and Public Pension plan should be taken in order to solve parents` financial issues from the point of social welfares. In addition, counseling of midlife crisis and other treatments and system should be developed to solve the psychological causes.