• 제목/요약/키워드: Fast Storage

검색결과 559건 처리시간 0.032초

옥트리에 기반한 5 축 가공 시뮬레이션을 위한 연구 (Research for the 5 axis machining simulation system with Octree Algorithm)

  • 김용현;고성림
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.956-959
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    • 2005
  • The overall goal of this thesis is to develop a new algorithm based on the octree model for geometric and mechanistic milling operation at the same time. Most commercial machining simulators are based on the Z map model, which has several limitations in terms of achieving a high level of precision in five-axis machining simulation. Octree representation being a three-dimensional (3D) decomposition method, an octree-based algorithm is expected to be able to overcome such limitations. With the octree model, storage requirement is reduced. Moreover, recursive subdivision is processed in the boundaries, which reduces useless computations. To achieve a high level of accuracy, fast computation time and less memory consumption, the advanced octree model is suggested. By adopting the supersampling technique of computer graphics, the accuracy can be significantly improved at approximately equal computation time. The proposed algorithm can verify the NC machining process and estimate the material removal volume at the same time.

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유연디스크용 가동 코일형 광 픽업 엑추에이터 개발 (Design of Moving Coil Type Optical Pickup Actuator for Flexible Disk)

  • 김윤기;송명규;이동주;박노철;박영필
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2006년도 추계학술대회논문집
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    • pp.479-483
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    • 2006
  • As high-definition television(HDTV) broadcasting were generalized, there have been many researches and developments about large storage capacity and fast data transfer rate in optical disk drives(ODD). Pickup actuators must have high flexible mode frequencies and gain margins. Flexible modes are caused by the flexibility of moving parts in the actuator and a servo bandwidth is limited by them. As a result, the system becomes unstable for high-speed operations in high density reading and recording. In this paper, we suggest improved modeling method that considers the bonding layer. And, flexible mode frequency of actuator is improved by Design of Experiment of lens holder. Magnet circuit is designed considering the relation with moving part. Through improving yoke design, the magnetic flux is changed and DC tilt is reduced. Consequently, we designed actuator which has high flexible mode frequency and gain margins.

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소형 HTS SMES와 실시간 전력계통 시뮬레이터의 연계 알고리즘 제안 (Connection Algorithm Proposal of Real Time Digital Simulator with Miniaturized HTS SMES)

  • 김아롱;김경훈;김광민;박민원;유인근;심기덕;김석호;성기철;박영일
    • 전기학회논문지
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    • 제59권1호
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    • pp.96-101
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    • 2010
  • Superconducting Magnetic Energy Storage (SMES) system is one of the key technologies to overcome the voltage sag, swell, interruption and frequency fluctuation by fast response speed of current charge and discharge. In order to evaluate the characteristics of over mega joule class grid connected High Temperature Superconducting (HTS) SMES system, the authors proposed an algorithm by which the SMES coil could be connected to the Real Time Digital Simulator (RTDS). Using the proposed algorithm, users can perform the simulation of voltage sag and frequency stabilization with a real SMES coil in real time and easily change the capacity of SMES system as much as they need. To demonstrate the algorithm, real charge and discharge circuit and active load were manufactured and experimented. The results show that the current from real system was well amplified and applied to the current source of simulation circuit in real time.

플래시 메모리 데이터베이스를 위한 플래시인지 트랜잭션 관리 기법 (Flash-Aware Transaction Management Scheme for flash Memory Database)

  • 변시우
    • 인터넷정보학회논문지
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    • 제6권1호
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    • pp.65-72
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    • 2005
  • 플래시 메모리는 이동형 컴퓨팅 환경에서 휴대용 정보기기를 지원하는 우수한 미디어이다. 플래시 메모리는 비휘발성, 낮은 전력소모, 빠른 데이터 접근 속도 등의 특징으로 휴대용 정보기기용 데이터베이스의 핵심 저장 모듈이 되었다. 하지만, 일반 RAM 메모리에 비하여 상대적으로 느린 연산 특성을 고려하여 기존의 트랜잭션 처리 기법을 개선할 필요가 있다. 이를 위하여, 본 논문은 플래시인지 트랜잭션 관리(Flash-Aware Transaction Management: FATM) 기법을 제안한다. FATM은 SRAM과 W-cache를 활용하여 트랜잭션 처리 성능을 높인다. 또한, 성능 검증을 위하여 시뮬레이션 모델을 제안하였으며, 실험 결과 분석을 통하여 FATM이 기존의 트랜잭션 처리 기법보다 우수함을 확인하였다.

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일반 싱글폴리 Nwell 공정에서 제작된 아날로그 메모리 (An Analog Memory Fabricated with Single-poly Nwell Process Technology)

  • 채용웅
    • 한국전자통신학회논문지
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    • 제7권5호
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    • pp.1061-1066
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    • 2012
  • 디지털 메모리는 신뢰성, 속도 그리고 상대적인 단순한 제어회로로 인해 지금까지 저장장치로서 널리 사용되어 왔다. 그러나 디지털 메모리 저장능력은 공정의 선폭감소의 한계로 인해 결국 한계에 다다르게 될 것이다. 이러한 저장 능력을 획기적으로 증가시키는 방안의 하나로서 메모리의 셀에 저장하는 데이터의 형태를 디지털에서 아날로그로 변화시키는 것이다. 한 개의 셀과 프로그래밍을 위한 주변회로로 구성된 아날로그 메모리가 0.16um 표준 CMOS 공정에서 제작되었다. 제작된 아날로그 메모리는 저밀도 불활성 메모리, SRAM과 DRAM에서 리던던시 회로 제어, ID나 보안코드 레지스터, 영상이나 음성 저장장치 등에 응용될 것이다.

속응자원의 국내 및 북미 ISO/RTO 주파수조정예비력 서비스 제공에 따른 보상규칙 비교 분석 (Comparison of Compensation Rules for Fast Responding Resources Providing Frequency Regulation Service in Domestic and North American ISO/RTO Power Electricity Market)

  • 박대현;박용기;박종배;김발호;노재형
    • 전기학회논문지
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    • 제67권5호
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    • pp.617-625
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    • 2018
  • Since FERC order 755 was published, each frequency regulation market rules of the North American ISO/RTO have been revised in many parts. In 2016, the domestic CBP market has also changed its market rules to allow ESS to participate in the frequency regulation reserve services(Governor Free and Automatic Generation Control). This paper compares and analyzes the changed North American ISP/RTO market and domestic CBP market rules. In particular, we compare PJM and CAISO frequency regulation market pricing mechanism and settlement rules with the settlement rules of the domestic CBP market and compare the factors of each market used to compensate the participating resources in terms of resource dependency and accuracy.

전력품질 개선을 위한 초전도 에너지 저장장치와 실시간 전력계통 시뮬레이터의 연계 알고리즘 개발 (Connection algorithm of Real Time Digital Simulator with HTS SMES for power quality improvement)

  • 김아롱;김대원;김경훈;김진근;박민원;유인근;심기덕;김석호;성기철
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.601_602
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    • 2009
  • Superconducting Magnetic Energy Storage (SMES) system is one of the key technologies to overcome the voltage sag, swell, interruption and frequency fluctuation by fast response speed of current charge and discharge. In order to evaluate the characteristics of over mega joule class grid connected High Temperature Superconducting (HTS) SMES system, the authors proposed an algorithm by which the SMES coil could be connected to the Real Time Digital Simulator (RTDS). Using the proposed algorithm, users can perform the simulation of voltage sag and frequency stabilization with a real SMES coil in real time and easily change the capacity of SMES system as much as they need. To demonstrate the algorithm, real charge and discharge circuit and active load were manufactured and experimented. The results show that the current from real system was well amplified and applied to the current source of simulation circuit in real time.

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재활용을 위한 몰드베이스 구조 및 표준화 (The Structure and Standardization of Mold Base for Recycling)

  • 제덕근;한성렬;송준엽;정영득
    • 한국정밀공학회지
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    • 제20권5호
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    • pp.225-231
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    • 2003
  • The injection molding is a traditional manufacturing method that can make plastic parts by just one time in mold. Therefore, the injection molding has become one of a manufacturing method, which is widely applied in a producing of plastic products. Nowadays, to use of plastic parts has increased and plastic product-model using term has been shorten. By these reasons, using term of a injection mold has fast been reduced. These produced molds will be disused and leaved in a storage after a regular term to use it. These leaved molds are sometime sold as scrap iron. But, these molds have lots parts for recycling except special parts for example, cavities, cores and eject pins, etc. In this research, we investigated when the cavity and core of in injection mold would be changed, the injection mold could be recycled. We suggested the structures and standardizations for recycling of a moldbase. We also developed a program in which can be used when the recycling moldbase design in the Auto-CAD with the recycling standards. We called this program as the Recy-Mold. For the availability of the program and moldbase structure fur the recycling standards, we experimented a used mold for automobile lens, which was remanufactured by the recycling standard. The results of this test showed feasibility for the recycling mold.

사용자 맞춤형 미디어 스트리밍 서비스를 위한 모바일 플랫폼 설계 및 구현 (Design and Implementation of Mobile Platform for Personalized Media Streaming Service)

  • 박성주;양창모
    • 한국방송∙미디어공학회:학술대회논문집
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    • 한국방송공학회 2010년도 하계학술대회
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    • pp.360-363
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    • 2010
  • Streaming Technology can support the real-time playback without downloading and storing multimedia data in local HDD. So, client browser or plug-in can represent multimedia data before the end of file transmission using streaming technology. Recently, the demand for efficient real-time playback and transmission of large amounts of multimedia data is growing rapidly. But most users' connections over network are not fast and stable enough to download large chunks of multimedia data. In this paper, we propose an intelligent IP streaming system based on personalized media service. The proposed IP streaming system enables users to get an intelligent recommendation of multimedia contents based on the user preference information stored on the streaming server or the home media server. The supposed intelligent IP streaming system consists of Server Metadata Agent, Pumping Server, Contents Storage Server, Client Metadata Agent and Streaming Player. And in order to implement the personalized media service, the user information, user preference information and client device information are managed under database concept. Moreover, users are assured of seamless access of streamed content event if they switch to another client device by implementing streaming system based on user identification and device information. We evaluate our approach with manufacturing home server system and simulation results.

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XML 문서관리를 위한 데이터 모델 설계 및 성능평가 (Design and Performance Evaluation of Data Models for the XML Document Management)

  • 유재수;손충범;조혜영
    • 인터넷정보학회논문지
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    • 제2권5호
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    • pp.59-70
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    • 2001
  • 최근 다양한 분야에서 XML이 인터넷상에서 정보교환의 표준으로 자리잡아 가고 있다. 따라서 그동안 XML 문서를 데이터베이스에 저장하고 검색하기 위한 데이터 모델링에 관한 연구가 활발히 진행되어 왔다. 그러나 기존의 연구들은 동적 환경에서 문서 변경 시 버전을 지원하면서 빠른 문서 검색을 효율적으로 지원하지 못하는 단점이 있다. 본 논문에서는 XML 저장 관리시스템에서 사용되고 있는 비분할 모델과 분할 모델의 장점들을 수용하여 동적 환경에 적합한 혼합 모델링 방법 4가지를 제안한다. 또한 시뮬레이션을 통하여 제안한 혼합형 모델링 기법의 우수성을 보인다. 이를 통해 다양한 동적 응용에 적합한 데이터 모델링을 제시하고자 한다.

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