• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.8
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• pp.1380-1385
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• 2006

A Pipelined Tone Wakeup(PTW) scheme(1) was proposed to support energy saving and end-to-end delay for sensor networks by providing an asynchronous wakeup pipeline to overlap the wakeup procedures with the packet transmission. But the scheme uses two radios and assumes error-free environments. In this paper, we propose a modified PTW scheme for wireless sensor networks. The proposed scheme is based on the PTW. The difference is that next hop information will be included in the ack packet from receiver node to sender node, So all the other neighbor nodes can stay in sleep mode long enough to save energy. Also ore get enhanced delay performance.

• Proceedings of the KIEE Conference
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• 2000.07a
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• pp.474-476
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• 2000

Because of the continuous growth of energy consumption, and also the tendency to site power lines and pipelines along the same route, the close proximity of power lines and metallic pipelines has become more and more frequent. Therefore, there has been and still is a growing concern about possible hazards resulting from the influence of power lines on metallic pipelines. This paper calculates the induced voltage of the pipeline which has the same right-of-war with 154kV and 22.9kV power cables in a tunnel. And propose the best phase order to minimize the induced voltage.

• 한국정보통신설비학회:학술대회논문집
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• 2004.08a
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• pp.115-118
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• 2004

본 논문에서는 파이프라인 아키텍처 기반의 네트워크 프로세서를 이용한 네트워크 시스템 개발에 대해 다룬다. 파이프라인 아키텍처는 구조상 Hazards 문제가 발생할 수 있으며 이는 시스템의 성능에 중요한 영향을 주게 된다. 또한 네트워크 프로세서는 고수준의 프로그래밍 모델을 제공하므로 고속의 패킷 처리를 위한 코드 작성이 수월하다. 따라서 파이프라인 아키텍처 기반의 네트워크 프로세서를 이용한 시스템 개발시 Hazards 문제를 피할 수 있는 방법과 효율적인 패킷 처리를 위한 코드 작성에 대한 지침을 제시하고 그 방법이 일반적인 방법보다 효율적임을 확인하였다.

• Journal of information and communication convergence engineering
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• v.6 no.1
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• pp.29-33
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• 2008

This paper presents the proposal and hardware design of JPEG baseline encoder. The JPEG encoder system consists of line buffer, 2-D DCT, quantization, entropy encoding, and packer. A fully pipelined scheme for JPEG encoder is adopted to speed-up an image compression. The proposed architecture was described in VHDL and synthesized in Xilinx ISE 7.1i and simulated by modelsim 6.1i. The results showed that the performance of the designed JPEG baseline encoder is higher than that demanded by real-time applications for $1024{\times}768$ image size. The designed JPEG encoder IP can be easily integrated into various application systems, such as scanner, PC camera, color FAX, and network camera, etc.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.959-962
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• 2002

This paper presents a method of constructing the universal multiple processing element unit(UMPEU) based on De Bruijn Graph. The proposed method is as following. Firstly we propose transformation operators in order to construct the De Bruijn graph using properties of graph. Secondly we construct the transformation table of De Bruijn graph using above transformation operators. Finally we construct the De Bruijn graph using transformation table. The proposed UMPEU is capable of constructing the De Bruijn geraph for any prime number and integer value of finite fields. Also the UMPEU is applied to fault-tolerant computing system, pipeline class, parallel processing network, switching function and its circuits.

• 한국전산유체공학회:학술대회논문집
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• 2010.05a
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• pp.127-128
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• 2010

As P-new-city is planned and constructed, district eating utilizing an existing near-by power plant's waste heat is considered as an economic and environment friendly way of providing heating to the new city. Many pipeline diameters and pumping station location and capacity were assumed, investigated and optimized, to satisfy the customers' heat demand considering common district heating pipe-network design and construction practice, and also and construction, pumping station land price and construction and the pumping energy cost during lifetime of DH systems.

• Proceedings of the Korea Water Resources Association Conference
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• 1996.05a
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• pp.605-610
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• 1996

광역상수도의 수도시설 및 관로시설의 적지를 선정하기 위한 시스템에서는 GIS기법을 이용하여 공간정보를 입력하고, 분석하며 적정입지를 선정할 수 있는 기초를 마련하였다. GIS를 이용한 적지선정기법을 방대한 지형정보의 종합적인 관리와 분석능력 및 시각적인 표현능력을 갖추고 있어 광역상수도의 적정노선 결정에 적합하며, 그 이용도가 점차 증가하는 추세이다. 본 연구에서는 포항시를 대상으로 GIS를 이용한 광역상수도의 수도 및 관로시설의 적지선정 시스템에 대한 타당성을 검증하였다. 수치지도는 국가기본도와 주제도중 토지이용도와 도시계획도를 작성하였다. 구축된 지형정보에 관한 기술조건을 만족하는 공간분석항목을 바탕으로 가능대안을 마련하였다. 본 연구의 결과, 기존 수도시설 및 관로시설의 적지선정 방법에 비해 개발된 시스템을 이용할 경우 많은 시간과 비용이 줄었다.

• JSTS:Journal of Semiconductor Technology and Science
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• v.11 no.4
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• pp.318-328
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• 2011

Stage-level reconfigurable chip multiprocessor (CMP) aims to achieve highly reliable and fault tolerant computing by using interwoven pipeline stages and on-chip interconnect for communicating with each other. The existing crossbar-switch based stage-level reconfigurable CMPs offer high reliability at the cost of significant area/power overheads. These overheads make realizing large CMPs prohibitive due to the area and power consumed by heavy interconnection networks. On other hand, area/power-efficient architectures offer less reliability and inefficient stage-level resource utilization. In this paper, I propose a hierarchical multiplexing interconnection structure in lieu of crossbar interconnect to design area/power-efficient stage-level reconfigurable CMP. The proposed approach is able to keep the reliability offered by the crossbar-switch while reducing the area and power overheads. Experimental results show that the proposed approach reduces area by up to 21% and power by up to 32% when compared with the crossbar-switch based interconnection network.

• The Bulletin of The Korean Astronomical Society
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• v.41 no.1
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• pp.75.3-75.3
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• 2016

We present a new survey of nearby galaxies to obtain deep wide-field images of 200 nearby bright galaxies in the southern hemisphere using Korea Microlensing Telescope Network (KMTNet). We are taking very deep and wide-field images, spending 4.5 hours for the B and R filters for each object. Using this dataset, we will look for diffuse, low-surface brightness structures including outer disks, truncated disks, tidal features and stellar streams, and faint companions. The multicolor data will enable us to estimate the incidence and star formation history of those features. We present an outline of the data reduction pipeline, and preliminary results from the commissioning data.

• Environmental Engineering Research
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• v.19 no.2
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• pp.117-122
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• 2014

Indexes of safety, restoration, damage impact, and management reliability were developed to assess reliability of drinking water distribution networks (DWDNs) management. The developed indexes were applied to evaluate the reliability of the pipeline management stage during unexpected mechanical and hydraulic accidents of components. The results were used to support the decision-making process in effective management and maintenance by enhancing the administrator's system understanding and by helping to create appropriate maintenance and management policies. The results of this study indicated that application of a management reliability index to assess DWDNs reliability may help create a more effective plan for establishing DWDNs management and maintenance.