• 한국환경복원기술학회지
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• 제15권2호
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• pp.31-40
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• 2012

The Environmental Conservation Value Assessment Map (ECVAM) is a five grade assessment map created with nationally integrated environmental information and environmental values. The map is made through the evaluation of 65 items, including greenbelt area and naturalness. Naturalness means original state of nature, and it is one of the most important evaluation items for conserving nature. The criteria of naturalness includes the Degree of Green Naturality (DGN) made by MOE. Using the data which has been not updated is a problem of accuracy for ECVAM. Therefore, this study would like to improve the criteria of naturalness. To improve the criteria, the study examined the effectiveness of DGN using field survey. The results of analysis the naturalness without DGN, some area changed grade of naturalness have been already damaged or cleared for agriculture and industrial purposes. The grade of naturalness should be included the concept of vegetation transition like DGN. The study suggested a improved method using vegetation type (natural and planted forest), forest age, and the grade of vegetation conservation. The method was reviewed by experts and field survey. After applying the method in South Korea, the grade of naturalness were distributed evenly like GradeI is 38.87%, GradeII is 37.62%, GradeIII is 23.51%, respectively. From the results of field survey, over 4 grade of forest age in natural forest showed similar pattern of structure and composition in original forests. Therefore, the improved criteria explained the naturalness better than existing criteria, and the accuracy of ECVAM has been improved more.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권10호
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• pp.4865-4885
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• 2019

We propose a FPGA based design that performs real-time power-efficient analysis of heterogeneous sensor data using adaptive ANN on edge gateway of smart military wearables. In this work, four independent ANN classifiers are developed with optimum topologies. Out of which human activity, BP and toxic gas classifier are multiclass and ECG classifier is binary. These classifiers are later integrated into a single adaptive ANN hardware with a select line(s) that switches the hardware architecture as per the sensor type. Five versions of adaptive ANN with different precisions have been synthesized into IP cores. These IP cores are implemented and tested on Xilinx Artix-7 FPGA using Microblaze test system and LabVIEW based sensor simulators. The hardware analysis shows that the adaptive ANN even with 8-bit precision is the most efficient IP core in terms of hardware resource utilization and power consumption without compromising much on classification accuracy. This IP core requires only 31 microseconds for classification by consuming only 12 milliwatts of power. The proposed adaptive ANN design saves 61% to 97% of different FPGA resources and 44% of power as compared with the independent implementations. In addition, 96.87% to 98.75% of data throughput reduction is achieved by this edge gateway.

• 디자인학연구
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• 제11권1호
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• pp.259-268
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• 1998

본 연구의 목적은 앞으로 지속될 전통도구의 미적 체험에 관한 새로운 인식을 체계화하는데 있다. 아름다움의 이상을 실현하기 위한 노력은 시대와 사회를 막론하고 끊임없이 다양한 형태로 표출되었다. 서로 다른 문화권에서 각기 다른 언어가 사용되듯이 도구 또한 고유한 형태언어를 갖는다. 시각적 의사소통을 전제하는 도구의 형태언어 또한 고유한 어휘와 문법을 갖는다. 우리는 종종 언어의 코드가 일치하지 않는 상황에서 타 문화권의 사고방식과 행동특성을 충분히 이해하는데 어려움을 느끼는 것 처럼 이해의 상황이 준비되지 않고는 진실한 미적 체험에 도달할 수 없다. 도구형태의 미적 가치를 올바로 인식하기 위해서는 도구의 탄생과 진화를 추진해 온 상황과의 역학관계를 인식하여야 한다. 어느 문화권이나 시대를 막론하고 그들이 설정한 에토스에 가장 진실하게 접근하고 그것을 가장 진실하게 표출해 온 도구들은 오랫동안 우리에게 사랑을 받고 보존되어 왔다. 그것은 아름다움을 추구하는 여성의 의복이나 장신구와 같은 미적 대상 뿐 아니라 언어와 같이 그들의 공동체의식을 가장 잘 표현하고 전달할 수 있는 것이라면 시대와 정신이 바뀌어도 변함없는 가치를 발휘할 것이다.

• KSBB Journal
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• 제20권2호
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• pp.123-128
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• 2005

효율적인 바이오칩을 개발을 위해 칩 표면에 생체 물질들의 상호반응이 효과적으로 일어날 수 있는 센싱 표면의 조성과 항원-항체 반응과 같은 생체인식 반응을 정량적 신호로 전환하는 방법에 대해 연구하였다. 전기화학식 센서의 표면을 개선하기 위해 폴리아미도아민 덴드리머를 가교 물질로 도입하였다. 생체 분자들의 인식작용을 정량적인 신호로 전환하기 위해 전형적인 면역조직화학분석에서 사용된 반응들을 바이오센서에 적용한 방법론을 사용하였다 효소에 의해 촉매되는 신호화 방법은 면역반응들에 대하여 광학식 센서와 전기화학식 센서에서 공히 수행되었으며, 매우 정량적인 신호로 측정되었다. 측정된 신호들로부터 단백질 농도에 비례하는 검량곡선을 획득할 수 있었으며 다양한 면역 샘플에 대한 적용 가능성을 제시하였다.

• 기술발표회
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• 통권2006호
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• pp.279-291
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• 2006

This study shows decision-making process for selection of cutoff wall on a wastewater treatment project. There are 10 different cut-off wall methods So, we examine the site to gather information for find appropriate methods. After using that information, 10 cutoff wall methods are reviewed for analysis. Through brainstorming, four alternatives are selected for design VE item. Following the standard VE process, we established performance criteria and evaluated function score(F) using questionnaire. The questionnaires, brainstorming and AHP method for weighting on performance criteria and evaluate function score increased the reliability of this selection process. Water Jet method, one of four methods, has the best function score(F=92.71) and the lease construction cost(as cost index 1,000). The value score also highest as 92.7, so we select the method. The result is value innovation type In addition, the authors try to calculate the environmental burden in selection process using LCA. We cannot conduct the full LCA as defined ISO, so perform Simple LCA In LCA result, the cut-off grouting has the least environmental burden as index 9.09E+01 and Water Jet method has following as the second. To selection best method to specific area and purpose, design VE/LCG process used as useful tool and it is needed to develop integrated method that evaluate VEILCC and LCA as one-set process.

• 천문학논총
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• 제24권1호
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• pp.65-81
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• 2009

We present the performance test results of VLBI Correlation Subsystem (VCS) trial product which was being developed for 1 year from August 2007. It is a core component of Korea-Japan Joint VLBI Correlator (KJJVC). The aim for developing VCS trial product is to improve the performance of VCS main product to reduce the efforts and cost, and to solve the design problems by performing the preliminary test of the manufactured trial product. The function of VCS trial product is that it is able to process the 2 stations-1 baseline, 8 Gbps/station speed, 1.2 Gbps output speed with FX-type. VCS trial product consists of Read Data Control Board (RDC), Fourier Transform Board (FTB), and Correlation and Accumulation Board (CAB). Almost main functions are integrated in the FTB and CAB board. In order to confirm the performance of VCS trial product functions, the spectral analysis, delay compensation and correlation processing experiments were carried out by using simulation and real observation data. We found that the overflow problem of re-quantization after FFT processing was occurred in the delay compensation experiment. We confirmed that this problem was caused by valid bit-expression of the re-quantized data. To solve this problem, the novel method will be applied to VCS main product. The effectiveness of VCS trial product has been verified through the preliminary experimental results, but the overflow problem was occurred.

• 한국통신학회논문지
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• 제24권7A호
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• pp.964-972
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• 1999

본 논문에서는 셀룰라 이동 통신시스템에서 BSC와 MSC 사이에 AAL 2를 적용하기 위한 시뮬레이션 모델을 제안하였다. 짧은 길이의 패킷을 처리하기 위해 프레임 구조와 이를 하나 또는 그 이상의 ATM 셀에 다중화 시키는 방식 등을 제시하였으며, 또한, 패킷화된 음성과 저속의 비트율을 갖는 데이터가 혼합된 트래픽을 사용하여 통계적 다중화의 효율 (AR), 전송 지연 특성, 채널전송효율 등을 해석하였다. 시뮬레이션 결과, AAL 2 다중화를 하지 않는 경우, 최대 수용 가능한 가입자 수가 최대 47 가입자이었으나, 다중화를 하는 경우, 최대 가입자 수는 Non-Overlapping 방식에서는 70, Overlapping 방식에서는 110이었다. 그러므로, Overlapping 방식을 적용한 layered 셀 방식이 Non-Overlapping 방식보다 더 효율적임을 알 수 있었다. 그리고, 대역폭이 2 Mbps인 셀룰라 이동 통신시스템의 경우 최적의 전송 버퍼 크기는 4 ATM 셀이 된다는 것을 알았다.

• 세라미스트
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• 제21권2호
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• pp.4-18
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• 2018

Lastly, neuromorphic computing chip has been extensively studied as the technology that directly mimics efficient calculation algorithm of human brain, enabling a next-generation intelligent hardware system with high speed and low power consumption. Three-terminal based synaptic transistor has relatively low integration density compared to the two-terminal type memristor, while its power consumption can be realized as being so low and its spike plasticity from synapse can be reliably implemented. Also, the strong electrical interaction between two or more synaptic spikes offers the advantage of more precise control of synaptic weights. In this review paper, the results of synaptic transistor mimicking synaptic behavior of the brain are classified according to the channel material, in order of silicon, organic semiconductor, oxide semiconductor, 1D CNT(carbon nanotube) and 2D van der Waals atomic layer present. At the same time, key technologies related to dielectrics and electrolytes introduced to express hysteresis and plasticity are discussed. In addition, we compared the essential electrical characteristics (EPSC, IPSC, PPF, STM, LTM, and STDP) required to implement synaptic transistors in common and the power consumption required for unit synapse operation. Generally, synaptic devices should be integrated with other peripheral circuits such as neurons. Demonstration of this neuromorphic system level needs the linearity of synapse resistance change, the symmetry between potentiation and depression, and multi-level resistance states. Finally, in order to be used as a practical neuromorphic applications, the long-term stability and reliability of the synapse device have to be essentially secured through the retention and the endurance cycling test related to the long-term memory characteristics.

• 디지털콘텐츠학회 논문지
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• 제6권2호
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• pp.107-112
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• 2005

인터넷 기술의 발전으로 멀티미디어 데이터의 중요성과 활용도가 증가됨에 따라 데이터베이스에서 멀티미디어 데이터를 표현하고 처리하기 위한 연구가 필요하게 되었다. 관계형 데이터베이스에서는 멀티미디어 데이터를 저장하기 위한 단순히 저장구조만을 지원하지만 멀티미디어에 대한 데이터형, 표한 질의에 대한 지원은 미흡하다. 이러한 문제를 해결하기 위해 ISO/IEC에서 멀티미디어 데이터를 위해 SQL 멀티미디어(SQL/MM)을 표준화하였다. 그러나 SQL/MM은 객체 관계형 데이터베이스에서는 지원하지만 RDBMS에서는 지원하지 않는다. 따라서 본 논문에서는 RDBMS 중 하나인 MS-SQL 2000에서 SQL/MM 지원하기 위해 쿼리변환기를 제안하고 이를 이용한 이미지 검색 프로그램도 함께 보인다. 쿼리 변환기는SQL/MM을 SQL로 변환하는 기능 외에 이미지 중복 체크기능을 추가로 제공한다. 그리고 쿼리 변환기를 이용한 이미지 처리 프로그램은 RDBMS 기반의 기존시스템과 쉽게 통합 운영이 가능하다.

• Steel and Composite Structures
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• 제1권1호
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• pp.17-32
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• 2001

The Rosette-joining system is a completely new press-joining method for cold-formed steel structures. One Rosette-joint has a shear capacity equal to that of approximately four screws or rivets. The Rosette thin-walled steel truss system presents a new fully integrated prefabricated alternative to light-weight roof truss structures. The trusses are built up on special industrial production lines from modified top hat sections used as top and bottom chords and channel sections used as webs which are joined together with the Rosette press-joining technique to form a completed structure easy to transport and install. A single web section is used when sufficient but can be strengthened by double-nesting two separate sections or by using two lateral profiles where greater compressive axial forces are met. An individual joint in the truss can be strengthened by introducing a hollow bolt into the joint hole. The bolt gives the connection capacity a boost of approximately 20%. A series of laboratory tests have been carried out in order to verify the Rosette truss system in practice. In addition to compression tests on individual sections of different lengths, tests have also been done on small structural assemblies and on actual full-scale trusses of a span of 10 metres. Design calculations have been performed on selected roof truss geometries based on the test results, FE-analysis and on the Eurocode 3 and U.S.(AISI) design codes.