• 전기의세계
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• v.34 no.8
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• pp.489-496
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• 1985

VLSI기술의 독특한 특징들은 이에 맞는 VLSI 지향적 아키텍쳐를 요구하게 된다. 이러한 아키텍쳐들은 영상신호 처리에 있어 중요한 실시간 처리를 위한 병렬처리 및 pipeline처리에도 잘 조화되어 고속영상신호 처리를 위한 시스템에서 VLSI기술이 필수적으로 사용 되어야 함을 알 수 있다. 현재 고속 영상신호 처리를 위한 VLSI 구조로 화면의 병렬성에 근거를 둔 CLA(Cellular Logic Array) 및 이의 단점을 보완한 피라밋 구조가 활말히 연구되고 있으나 거대한 양의 하드웨어 및 주변 시스템의 요구로 그 규모가 방대하여 지는 흠이 있다. 이에 반하여 화소 Kernel의 병렬성에 근거를 두는 pixel-kernel 프로세서는 영상신호 데이타의 공간의존성의 기본 단위인 Kernel을 병렬처리하고 그 거대성 및 균일성은 Pipeline 처리를 함으로써 비교적 작은 하드웨어로 높은 성능을 얻을수 있다. 또한 기존 영상 Sensor 로부터의 데이타 흐름을 중단 시키지 않고 처리할 수 있으며 기본 프로세서의 다양한 조합 방법에 의해 시스템 구조상의 유연성을 갖는다. 따라서 로보트 등의 실제적인 응용분야에서 후자의 구조가 효율적으로 사용될 것으로 전망된다. 앞으로 효과적인 pixel-Kernel 프로세서의 개발을 위해 PKF 계산구조의 연구와 함께 효과적인 Kernel 병렬성을 실현할 수 있는 VLSI 지향적 구조의 개발이 요구된다.

• Journal of Technology Innovation
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• v.29 no.1
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• pp.39-73
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• 2021

The cooperative network structure influences the academic performance of the research institute. In particular, South Korea's Government-Funded Research Institutes(GRI) need to establish an efficient cooperative system as a leading national R&D implementer. This study applied the Small World structure, which has been discussed as an efficient network structure, and the centrality of representing the characteristics of nodes to the cooperative network of GRI in Korea. Based on the SCIE published data from 2010 to 2019, we analyze how the Small World characteristics and centrality of GRI contribute to academic performance using a network analysis and Feasible GLS regression. The GRI cooperative network has shown that the Small World network structure facilitates the academic performance. In addition, centrality indicating the degree of direct connection showed positive significance, but centrality indicating the degree of intermediary was not significant or negative. The results of this study explain that the higher the number of institutions that exchange and cooperate, the higher the academic performance, and the higher the performance of the institutions that serve as the center of cooperation. In addition, it was established that the stronger the cooperative network of GRIs have the characteristics of Small World, the more effective it is to create research results. This study applies centrality and Small World previously discussed as an efficient network structure to the GRI cooperation network and provide implications for establishing policies and strategies related to R&D cooperation among GRIs.

• Journal of the Earthquake Engineering Society of Korea
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• v.1 no.2
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• pp.1-15
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• 1997

This paper presents substructural identification methods for the assessment of local damages in complex and large structural systems. For this purpose, an auto-regressive and moving average with stochastic input (ARMAX) model is derived for a substructure to process the measurement data impaired by noises. Using the substructural methods, the number of unknown parameters for each identification can be significantly reduced, hence the convergence and accuracy of estimation can be improved. Secondly, the damage index is defined as the ratio of the current stiffness to the baseline value at each element for the damage assessment. The indirect estimation method was performed using the estimated results from the identification of the system matrices from the substructural identification. To demonstrate the proposed techniques, several simulation and experimental example analyses are carried out for structural models of a 2-span truss structure, a 3-span continuous beam model and 3-story building model. The results indicate that the present substructural identification method and damage estimation methods are effective and efficient for local damage estimation of complex structures.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.107-108
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• 2021

농업용 전기차는 일반 전기차에 비해 경량성 및 연료의 효율성이 매우 중요하다. 또한, 충돌에 대비한 재질의 강도적인 측면에서 다소 자유로움을 가진다. 본 연구에서는 레이저 가공, 절곡, 도장 등의 복잡한 절차를 통한 가공 공정을 대체하여 생산의 효율성을 극대화 할 수 있는 진공성형을 위한 전기차 전면부 3차원 설계 방법을 제안한다. 보닛 및 휀더의 3차원 설계 및 진공성형 금형 기술 개발을 통하여 제품의 안정성과 생산성 및 편의성을 향상시키는 것이 연구의 주요 목적이다. 주요 연구 절차는 CATIA를 이용한 설계 결과물을 바탕으로 ABAQUS를 이용한 구조해석을 통해 안정성을 확인하고 3D Scanner를 이용하여 시제품의 치수 확인을 통한 실효성을 검증한다. 본 연구의 결과물은 농업용 전기차 주 고객층인 고령자 및 여성 농업 종사자들에게 널리 사용될 수 있을 것으로 사료된다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.14 no.2
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• pp.237-247
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• 2001

강상판교는 부재수가 많고 구조적 거동이 복잡하여 재래적인 단일수준 (CSL) 알고리즘을 이용하여 최적화하는 것이 매우 어렵기 때문에 본 연구에서는 강상판교를 효율적으로 최적화하기 위해 다단계 최적설계 (MLDS) 알고리즘이 제안되었다. 강상판교를 주형과 강상판으로 나누기 위해 등위법이 사용되었고, 시스템 최적화를 위하여 설계 변수를 줄이는 분해법이 사용되었다. 효율적인 최적설계를 위해 다단계 최적설계 알고리즘은 제약조건 소거기법(Constraint Deletion)과 응력 재해석 같은 근사화 기법을 도입하였다. 변위해석을 위한 제약조건 소거기법은 교량의 최적화에 효율적인 것으로 검증되었고, 제안된 응력 재해석 기법 또한 설계민감도 해석을 필요로 하지 않으므로 매우 효율적이다. MLDS 알고리즘의 적용성과 강건성은 다양한 수치예제를 사용하여 기존의 단일수준 알고리즘과 비교하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.79-82
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• 2002

단백질 3차 구조 정보는 PDB에서 플랫화일 형태로 제공되고 있으며 이러한 플랫화일 각각의 엔트리들은 단백질 3차 분자 구조를 구성하는 원자들의 공간좌표정보, 서열정보, 실험정보 및 참조정보 등으로 구성된다. 이러한 정보들을 포함하고 있는 플랫파일로부터 필수적인 구조정보 및 서열정보 등의 효율적 검색을 위해서는 플랫파일을 데이터베이스로 구축함과 동시에, 구축된 데이터베이스를 위한 유사성 검색시스템 구축이 요구된다. 따라서, 이 논문에서는 Protein DataBank에서 제공하는 플랫파일을 공간객체 모델링기법에 기반한 관계형 데이터베이스로 구축하고 PSI-BLAST를 적용하여 단백질 서열 유사성 검색 시스템을 구축한다. 이렇게 함으로써 단백질 3자 구조 분자를 구성하는 원자에 대한 검색과 구조에 대한 서열 유사성 검색을 통하여 단백질 3차 구조 분류 및 구조 예측 시스템 구축에 활용할 수 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.3
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• pp.620-626
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• 2021

The purpose of this study is to examine the characteristics and industrial structure and to present a future vision through analysis of industrial agglomeration, growth, and industrial efficiency targeting the Chungnam display industry nurtured by regional industrial policies since 2002. The industrial scale and aggregate status were analyzed through the business scale quotient and location quotient, and the growth and pace of structural change in the industry were analyzed through the industrial growth rate and change of industrial structure. Analysis results found the display industry shows its solid status based on industrial agglomeration. The RLQ, added value ratio, and employment coefficient have a relatively high comparative advantage. However, the growth rate has declined, and the pace of structural change has become lower. The regional competitiveness has been deteriorating. It is necessary to develop strategies to help the industry evolve into a convergence display industry to secure competitiveness by forming value chains. The regional industrial policy 'Regional Innovation Growth Plan' should be utilized to foster local industries that consider the regional characteristics and development directions and to promote the shared growth of related subsidiary industries through fostering specialized complexes for materials, parts, and equipment.

• The KIPS Transactions:PartC
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• v.16C no.2
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• pp.151-164
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• 2009

The importance of sensor networks as a base of ubiquitous computing realization is being highlighted, and espicially the security is recognized as an important research isuue, because of their characteristics.Several efforts are underway to provide security services in sensor networks, but most of them are preventive approaches based on cryptography. However, sensor nodes are extremely vulnerable to capture or key compromise. To ensure the security of the network, it is critical to develop security Intrusion Detection System (IDS) that can survive malicious attacks from "insiders" who have access to keying materials or the full control of some nodes, taking their charateristics into consideration. In this perper, we design a distributed and adaptive IDS architecture on sensor networks, respecting both of energy efficiency and IDS efficiency. Utilizing a modified HEED algorithm, a clustering algorithm, distributed IDS nodes (dIDS) are selected according to node's residual energy and degree. Then the monitoring results of dIDSswith detection codes are transferred to dIDSs in next round, in order to perform consecutive and integrated IDS process and urgent report are sent through high priority messages. With the simulation we show that the superiorities of our architecture in the the efficiency, overhead, and detection capability view, in comparison with a recent existent research, adaptive IDS.

• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.3
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• pp.31-38
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• 2010

In this study, it is suggested that it has to reliability-based design methodology with respect to bridge structure-rail longitudinal interaction and bridge structure-vehicle interaction. For the structural analysis, commercial package, ABAQUS, are used for a three-dimensional finite element analysis. The optimization process utilizes a well-known optimizer, ADS(Automated Design Synthesis). Optimization technique is utilized the ALM-BFGS method for global area search and Golden Section Method for 1-D search. In general, ALM-BFGS method don't need the 1-D search, and that algorithm converge a 0.1~0.2 of Push-Off factor. But in this study, value of Push-Off factor is used 90, therefore 1-D search should be needed for effective convergency. That algorithm contains the "heuristic decision method". As a result of optimum design of 2-main steel girder birdge with 5${\times}$(1@50m), design methodology suggested in this study was demonstrated more economic and efficient than existing design and LCC optimization not considering bridge-rail longitudinal interaction and bridge-vehicle interaction.

• Economic Analysis
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• v.26 no.4
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• pp.1-38
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• 2020

In this research, we explore the effects of changes in industrial structure due to industrial restructuring on employment and growth in the Korean economy. To that end, we first investigate the impact of industrial restructuring on employment through Lilien's sectoral shift hypothesis, considering the dependence of industrial restructuring on business cycles. As a result of the analysis, we find that changes in the industrial structure have exerted a short-term effect of increasing unemployment, and that the effects of industrial restructuring are even greater during the economic downturn period. In light of these points, Lilien's sectoral shift hypothesis seems to be valid in Korea. Next, we examine the effect of industrial restructuring on economic growth in Korea by analyzing which one, between the Kuznetz hypothesis and the Baumol effect, is dominant. Empirical results reveal that the mid- to long-term effect of industrial restructuring on GDP growth is significant, which is in accordance with the Kuznets hypothesis, where resource allocation along with industrial restructuring to sectors with high productivity spurs economic growth.