• Journal of Communications and Networks
• /
• 제18권2호
• /
• pp.162-172
• /
• 2016

The placement of the complete baseband processing in a centralized pool results in high data rate requirement and inflexibility of the fronthaul network, which challenges the energy and cost effectiveness of the cloud radio access network (C-RAN). Recently, redesign of the C-RAN through functional split in the baseband processing chain has been proposed to overcome these challenges. This paper evaluates, by mathematical and simulation methods, different splits with respect to network level energy and cost efficiency having in the mind the expected quality of service. The proposed mathematical model quantifies the multiplexing gains and the trade-offs between centralization and decentralization concerning the cost of the pool, fronthaul network capacity and resource utilization. The event-based simulation captures the influence of the traffic load dynamics and traffic type variation on designing an efficient fronthaul network. Based on the obtained results, we derive a principle for fronthaul dimensioning based on the traffic profile. This principle allows for efficient radio access network with respect to multiplexing gains while achieving the expected users' quality of service.

• Journal of Welding and Joining
• /
• 제27권6호
• /
• pp.25-30
• /
• 2009

SBD (Strain-based design) of pipe lines have gained world-wide attention in recent years. The present research aims to evaluate the fracture characteristics of API (America Petroleum Institute) SBD X100 girth weldment that typically applied for cold climate and deep water offshore, with the focus on the influence of heat input changing with 6kJ/cm and 10kJ/cm from GMAW (Gas Metal Arc Welding). At a low heat input at 6kJ/cm, the weld metal had Multi-phase matrix (Acicular ferrite + Banite + Martensite) that could fill up both fracture toughness and strength as reported previously. Also, the weld metal exhibited 859MPa YS (Yield strength), 108J impact toughness at $-40^{\circ}C$ and 0.52mm CTOD (Crack Tip Open Displacement) at $-10^{\circ}C$. These results can be satisfied with the requirement of API SBD X100 girth weldment and Alaska pipe line project.

• KIEAE Journal
• /
• 제15권6호
• /
• pp.47-56
• /
• 2015

Purpose and Method: Despite benefits of building energy simulations, practitioners seem to be reluctant to use simulations for design decision making. By means of survey and interviews, this study aims to investigate domestic hindrance against increasing simulation usability, and to collect user requirement to enhance technical functionality of the simulation. Also this study compares the Information Sharing Workflow by Stantec and general domestic design process in order to identify a direction of the Integrated Design Process. Result: Finally this study wraps up with suggestions of how simulation functionality and use protocol should be in order to satisfy user requirement and also to gather more users.

• 한국컴퓨터정보학회논문지
• /
• 제8권4호
• /
• pp.132-137
• /
• 2003

인터넷 기술과 웹 기반 응용 프로그램의 발전으로 광역 분산처리에 대한 요구가 기하급수적으로 증대되고 있다. 이러한 광역 분산처리 환경의 요구사항에 적용할 수 있는 모델로 모바일 에이전트를 들 수 있다. 그러나 현재의 모바일 에이전트 모델은 여러 가지 기술적 제약점들을 가지고 있다. 모바일 에이전트가 광역 분산 처리 환경에서 사용되기 위하여 필요한. 모바일 에이전트 시스템의 구조와 사용되는 프로그래밍 패러다임과 사용 기술 등에 있어서의 문제점들을 분석하였다.

• Architectural research
• /
• 제17권3호
• /
• pp.83-91
• /
• 2015

A comprehensive understanding of functions and performances enables a selection of appropriate alternatives to the existing design and can prevent defective design. A performance-based design quality management can ensure successful project completion. This study proposes a new model for design quality management in order to prevent defective design and to minimize design change. The new quality management model defines the requirement about function and performance based on technical characteristic, and assesses suitability for design alternatives. This study attempts to propose a quality matrix assessment method that can compare the alternative design and requirements defined with the new quality management model. This method can judge conformity and suitability of design quality in accordance with the requirements configured.

• 한국컴퓨터산업학회논문지
• /
• 제6권3호
• /
• pp.415-420
• /
• 2005

게임 산업체에서 요구하는 기술 능력과 컴퓨터 관련 학과 졸업생들의 능력 차이로 기업들의 재교육비가 크게 증가하는 것은 바람직하지 않다. 이에 본 논문에서는 게임 업체에서 요구하는 인력의 기술 능력 수준과 컴퓨터 관련 학과 졸업자들의 기술 능력 수준을 비교, 분석하고 이를 바탕으로 게임 소프트웨어 전문 인력의 실무 능력 향상 및 활용도 제고를 위한 교과 과정을 제시하고자 한다.

• 항공우주기술
• /
• 제6권1호
• /
• pp.6-13
• /
• 2007

본 논문에서는 언제 어디서나(유비쿼터스) 빠르게 지정간 수송을 가능하게 해주며 현재 의 자동차를 대체할 수 있는 개인용 항공기, 즉 PAV(personal Air Vehicle)에 대하여 요구 조건을 살펴보고, 기존의 고속 회전익기 개념과 현재 진행 중인 고속회전익기 개발사업을 개괄적으로 검토하여, PAV 적용가능 플랫폼으로서 고속 회전익기 개념 및 기술적 이슈를 탐색하였다.

• International Journal of Knowledge Content Development & Technology
• /
• 제10권1호
• /
• pp.7-20
• /
• 2020

For research data to be shared without legal, financial and technical barriers in the Open Science era, data repositories must have the functional requirements asked by DMP and CoreTrustSeal. In order to derive functional requirements for the data repository, this study analyzed the Data Management Plan (DMP) and CoreTrustSeal, the criteria for certification of research data repositories. Deposit, Ethics, License, Discovery, Identification, Reuse, Security, Preservation, Accessibility, Availability, and (Meta) Data Quality, commonly required by DMP and CoreTrustSeal, were derived as functional requirements that should be implemented first in implementing data repositories. Confidentiality, Integrity, Reliability, Archiving, Technical Infrastructure, Documented Storage Procedure, Organizational Infrastructure, (Meta) Data Evaluation, and Policy functions were further derived from CoreTrustSeal. The functional requirements of the data repository derived from this study may be required as a key function when developing the repository. It is also believed that it could be used as a key item to introduce repository functions to researchers for depositing data.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2003년도 하계종합학술대회 논문집 II
• /
• pp.1161-1164
• /
• 2003

We have developed an optimization algorithm based formulation for performing efficient time driven simultaneous place and route for FPGAs. Field programmable gate array(FPGAs) provide of drastically reducing the turn-around time for digital ICs, with a relatively small degradation in performance. For a variety of application specific integrated circuit application, where time-to-market is most critical and the performance requirement do not mandate a custom or semicustom approach, FPGAs are an increasingly popular alternative. This has prompted a substantial amount of specialized synthesis and layout research focused on maximizing density, minimizing delay, and minimizing design time.

• 한국마린엔지니어링학회:학술대회논문집
• /
• 한국마린엔지니어링학회 2002년도 춘계학술대회논문집
• /
• pp.193-199
• /
• 2002

According to the NOx level requirement of annex Vl to IMO(International Maritime Organization) MARPOL 73/78, this regulation shall apply to each diesel engine with a power output of more than 130 ㎾ which is installed on a ship constructed and undergoes a major conversion on or after 1 January 2000. It is inevitable to adopt IMO standard for marine engines. Therefore, most of diesel engines which are being currently built should be tested and surveyed in accordance with the NOx technical code. In this study, various technics of NOx reduction methods were investigated for the diesel engines and the methods of NOx measuring were introduced by the new and simplified field detecting equipment. These results can be utilized for the basic design and developement of diesel engine for NOx reduction.