• Journal of information and communication convergence engineering
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• 제8권6호
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• pp.682-686
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• 2010

In this paper, we propose the fast wakeup and connection mechanisms for various energy saving schemes in order to improve QoS. First, we offer the interconnection of heterogeneous access networks via the Media Independent Information Server/Service (MIIS). Then, we propose the fast wakeup and connection mechanism for multi-interface communication systems. The proposed novel mechanism focuses on the fast provision of incoming service destined to the interface currently in energy saving mode by using MIIS-assisted interconnection. We further evaluate the performance of proposed mechanism through the numerical and experimental analysis.

• 한국항행학회논문지
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• 제21권4호
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• pp.402-412
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• 2017

방송 기술과 통신 기술의 융합은 유비쿼터스 네트워크를 위한 핵심 기술 중 하나이다. 본 논문에서는 AT-DMB(advanced terrestrial digital multimedia broadcasting) 방송망과 통신망의 융합망을 제안하고, MIIS(media independent information server/service)를 통한 방송 시스템과 통신 시스템 간 연동을 제공하는 융합 시스템을 제안한다. 특히, 방송통신 융합망에서 QoS(Quality of Service)와 전력절감의 향상을 위한 fast wakeup and connection 기술을 제안한다. 제안하는 기술은 사용자 단말의 휴지기 인터페이스로 유입되는 서비스 지연과 해당 인터페이스의 전력소모를 최소화하는 기술이다. 끝으로, 시뮬레이션 및 성능분석을 통해 제안하는 기술이 서비스 지연을 감소시키면서 전력소모를 최소화할 수 있음을 확인하였다.

• 한국통신학회논문지
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• 제41권6호
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• pp.631-639
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• 2016

현재 Wi-Fi Alliance에서 발표한 Wi-Fi Peer-to-Peer Technical Specification (v1.4, 2014) 기술은 Wi-Fi Direct 접속을 위하여 개발되었으며, 최근 출시되는 대부분의 스마트폰과 TV, 모니터, 셋톱박스, 게임콘솔 등의 장치에서 상용화되고 있다. 하지만, 위 기술 표준에서 정의되는 초기 접속 절차는 5~10 초의 시간이 소모되며, 이는 해당 기술의 성능과 더불어 사용의 편의성 측면에서도 문제가 될 수 있다. 이러한 문제는 현재 표준 기술의 Scan 절차와 Find 절차로 구성된 초기 Discovery 절차의 비효율성으로 인하여 발생되며, 본 고는 이와 같은 문제를 해결하기 위하여 Wi-Fi Direct 절차를 구성하는 Scan 및 Find 절차를 재구성하여 Discovery 소요 시간을 단축시키고 접속 환경에 대한 효율을 향상시켰으며, 객관적 검증을 위하여 성능분석과 실험을 진행하였다.

• 한국전기전자재료학회논문지
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• 제26권1호
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• pp.68-72
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• 2013

The series connection-type superconducting fault current limiter (SFCL) with two magnetically coupled circuits was suggested and its effectiveness through the analysis on the current limiting and recovery characteristics was described. The fault current limiting characteristics of the proposed SFCL as well as the load voltage sag compensating characteristics according to the winding direction were investigated. To confirm the fault current limiting and the voltage sag suppressing characteristics of the this SFCL, the short-circuit tests for the simulated power system with the series connection-type SFCL were carried out. The series connection-type SFCL designed with the additive polarity winding was shown to perform more effective fault current limiting and load voltage sag compensating operations through the fast quench occurrence right after the fault appears and the fast recovery operation after the fault removes than that with the subtractive polarity winding.

• 콘크리트학회논문집
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• 제16권4호
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• pp.573-579
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• 2004

For the fast construction and replacement of bridges in urban area, a prefabricated bridge system can be an excellent alternative. Details of prefabricated slabs for PSC girders were developed and static tests on shear connections were conducted to propose design equations of the shear connection. Stirrups and stud connectors were used as shear connectors and non-shrink mortar was used for the filling material in shear pockets for shear connectors. Stirrups and studs were fabricated to insert embedded nut-type devices in PSC girders. Shear strength of the shear connection considering chemical bond, friction and mechanical connectors was evaluated and empirical equations were suggested. Due to the mechanical connectors, ultimate slip capacity of the shear connection was sufficient for shear load redistribution, and suggested details of the shear connection showed good performance in terms of strength and ductility.

• Computers and Concrete
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• 제32권3호
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• pp.339-349
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• 2023

Fast-built construction is a key feature for successful applications of precast concrete (PC) moment frame system in recent construction practices. To this end, by introducing some unique splicing details in precast connections, especially between PC columns including panel zones, use of temporary supports and bracings can be minimized based on their self-sustaining nature. In addition, precast wide beams are commonly adopted for better economic feasibility. In this study, three self-sustaining precast concrete (PC) wide beam-column connection specimens were fabricated and tested under reversed cyclic loadings, and their seismic performances were quantitatively evaluated in terms of strength, ductility, failure modes, energy dissipation and stiffness degradation. Test results were compared with ASCE 41-17 nonlinear modeling curves and its corresponding acceptance criteria. On this basis, an improved macro modeling method was explored for a more accurate simulation. It appeared that all the test specimens fully satisfy the acceptance criteria, but the implicit joint model recommended in ASCE 41-17 tends to underestimate the joint shear stiffness of PC wide beam-column connection. While, the explicit joint model along with concentrated plastic hinge modeling technique is able to present better accuracy in simulating the cyclic responses of PC wide beam-column connections.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 춘계학술대회
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• pp.76-79
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• 2009

최근 학회와 산업분야에서 모바일 사용자들에게 다양한 무선 기술들을 통합하여 끊김없는 접속을 제공하기 위한 노력들이 이루어지고 있다. 단말의 연속적인 서비스 지원을 위해서는 고속의 핸드오버 기능 및 위치관리 기능이 필요하다. 특히 고속의 핸드오버를 수행하기 위해서는 액세스망에 의존적인 데이터링크 계층 기능들과 IP기반 이동성 기능들이 밀접히 연계되어 동작되어야 한다. 본 논문에서는 대표적인 핸드오버 기술인 MIH(Media Independent Handover)의 이론적 배경과 제안한 핸드오버 결정 기술과 함께 비교 분석한다.

• 대한전자공학회논문지SD
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• 제43권10호
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• pp.68-73
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• 2006

본 논문에서는 SoC(System On a Chip)의 효율적인 설계와 빠른 검증을 위해서 Active-HDL과 Matlab의 Simulink를 연동하여 HDL, SystemC 및 알고리즘 레벨의 추상화를 동시에 통합하여 시뮬레이션 할 수 있는 방법론을 제시하고, 이를 이용한 다채널 스피커의 직렬연결 기법을 설계 및 구현하였다. 구현은 ARM 프로세서와 Xilinx Virtex4 FPGA를 기반으로 하고 AMBA 버스를 사용하여 연동하는 SoC Master 보드 상에서 이루어졌다. 이러한 방법은 하드웨어 부분의 RTL 코드를 IP화하여 소프트웨어 부분과 동시에 검증 할 수 있는 장점을 가지고 있으며 직렬 연결 스피커 시스템과 같이 많은 신호처리를 하는 부분에서 쉽고 빠르게 설계를 진행할 수 있음을 보였다.

• 복식
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• 제59권3호
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• pp.27-41
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• 2009

Interpreting the phenomenon of Fast fashion that is prevalent these days, this research is meaningful in that it prepares the frame which suggests the vision to read the trend of 2000s and analyzes the property of phenomenon of Fast Fashion in the connection with society and culture. The so[io-cultural property can be largely characterized by consumption orientation, change orientation, efficiency, moment and multiculturism. Analyzing the phenomenon of fast fashion that emerged after 2000 on the basis of such sociocultural background, it is largely classified into imitation, fashionability, disposability, portability, transformation and convergence. Due to the hi-polarization of consumption, people tend to select imitated goods, and people accustomed to speed get interested in the fashionability of all Phenomena. Further, society that is transient and changing rapidly makes the habit of purchasing in disposability. The property of nomad society encourages to keep the habit of portability. Such change-oriented society and rapidly changing life pattern make them adapt in diverse transformation modes of Fast Fashion. Further, multi-cultural world integrates enterprises through combination of all cultures and the convergence of all factors.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계학술발표회 논문집(I)
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• pp.530-533
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• 2006

This thesis investigates the behavior of precast wall systems with a new vertical connection which are proportioned by the displacement based design. The proposed precast wall systems are supposed to provide additional spaces and seismic strengthening in remodeling existing residential buildings. For a fast remodeling constructions using PC walls require an efficient, economic fabrication method. A C-type vertical connections for PC wall systems is proposed for transfer of bending moment between walls in the vertical direction while a shear key in the center of wall is prepared to transfer shear forces by bearing. The proposed vertical connection allows us easy fabrication because of different direction of slots at the edges of wall. The dimension of C-type connection components are determined by engineering models and a series of test.