• Journal of the Institute of Electronics Engineers of Korea SC
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• v.40 no.5
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• pp.326-332
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• 2003

This paper deals with a model reduction for linear systems with time varying delayed states. A generalized controllability and observability gramians are defined and obtained by solving linear matrix inequalities. Using the generalized controllability and observability gramians, the balanced state space equation is realized. The reduced model can be obtained by truncating states in the balanced realization and the upper bound of model approximation error is also presented. In order to demonstrate efficacy of the suggested method, a numerical example is performed.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.41 no.2
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• pp.29-36
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• 2004

This paper deals with a fractional model reduction for linear systems with time varying delayed states. A contractive coprime factorization of linear time delayed systems is defined and obtained by solving linear matrix inequalities. Using generalize controllability and observability gramians of tile contractive coprime factor, a balanced state space realization of the system is derived. The reduced model will be obtained by truncating states in the balanced realization and an upper bound of model approximation error is also presented. In order to demonstrate efficacy of the suggested method, a numerical example is illustrated.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.35S no.11
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• pp.68-74
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• 1998

This paper deals with a model reduction problem for the linear systems with state delay. After defining the controllability/observability Gramians, the concept of a balanced model for the linear systems with state delay is introduced. Based on solutions of linear matrix inequalities, the model reduction method with guaranteed error bounds is developed. In order to demonstrate the efficacy of teh suggested method, a numerical example is also performed.

• 한국경영정보학회:학술대회논문집
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• 2007.06a
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• pp.837-842
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• 2007

일반기업에서 성과측정이 매우 중요시되는 것과 마찬가지로 공공환경의 복잡한 변화와 함께 공공기관에서도 성과측정이 중요시 되고 있다. 이에 따라 공공기관에서는 무형자산의 중요성을 인식하면서 성과측정과 관리의 수단으로 균형성과지표(Balanced Scorecard)를 도입하고 있다. 그러나 균형성과지표는 일반기업의 성과측정을 위해 고안된 방법론으로 공공기관의 특성을 반영할 수 있도록 변형되지 않고서는 공공기관에 그대로 도입되어 사용될 수는 없다. 더욱이 기존의 BSC는 '시간지연(time delay)'을 가지고 있는 지표들간의 상호작용 및 상호 의존성을 반영하지 못하고 있으며, 지표들간의 피드백을 유발하는 인과관계를 간과하고 있다. 따라서 본 연구에서는 핵심지표들간의 상호작용 및 관계성의 설정과 새로운 정책이나 입법과정에서 발생할 수 있는 '시간지연'에 의한 영향 등을 반영하고자 시스템다이내믹스(System Dynamics)와 시스템사고를 적용, 공공기관, 성과측정에 적합한 Dynamic BSC 모델을 개발하고자 한다.

• The KIPS Transactions:PartA
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• v.17A no.1
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• pp.27-32
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• 2010

Logical Effort is a simple hand-calculated method that measures quick delay estimation. It has the advantage of reducing the design cycle time. However, it has shortcomings in designing a path for minimum area or power under a fixed-delay constraint. In this paper, we propose an equal delay model and, based on this, a method of optimizing power-delay efficiency in a logical path. We simulate three designs of an eight-input AND gate using our technique. Our results show about 40% greater efficiency in power dissipation than those of Logical Effort method.

• KIPS Transactions on Computer and Communication Systems
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• v.2 no.3
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• pp.103-110
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• 2013

Logical Effort [1, 2] is a simple hand-calculated method that measures quick delay estimation. It has the advantage of reducing the design cycle time. However, it has shortcomings in designing a path for minimum area or power under a fixed-delay constraint. The method of overcoming the shortcomings is shown in [3], but it is constrained for a single logical path. This paper presents an advanced gate sizing method in multiple logical paths based on the equal delay model. According to the results of the simulation, the power dissipation for both the existing logical effort method and proposed method is almost equal. However, compared with the existing logical effort method, it is about 52 (%) more efficient in space.

• Proceedings of the CALSEC Conference
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• 1997.11a
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• pp.287-302
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• 1997

$\square$ 연구 프로세스 $\bigcirc$ 연구 프로세스 무기(장비)의 개발 프로세스의 시작 점 ☆ 무기(장비)개발의 지연, 비용 증가, 개발 실패의 중요한 발생 요인 내포 $\bigcirc$ 연구 프로세스의 전통적 관점과 현재의 프로세스적 관점 ☆ 전통적 사고： 전문 연구자의 과도한 통제는 긴장 유발 가능으로 연구프로세스를 ‘블랙 박스’로 인식 ☆ 현재： 연구의 가시성과 모니터링 가능 $\bigcirc$ 연구 프로세스의 개선 추진 요인 ☆ 컴퓨터를 이용한 실험실 모델/분석, 컴퓨터 기반의 현장 시험과 결과의 커뮤니케이션, 추적 시스템/프로젝트 관리 시스템, 프로젝트 상에서 정보의 광범위한 유포 $\bigcirc$ 체계개념연구 프로세스의 프로세스 개선전략 ☆ 연구 프로세스 개선 추진요인을 통해, 연구 관련 정보를 관리 사업을 과속화/지연, 자원활용 극대화, 전망이 어두운 사업을 판별 조기 취소 ☆ 정보기술과 추진요인이 지닌 능력의 결합으로 개선 유도 ☆ 유의점： 연구에 종사하는 과학자, 전문 연구자의 전통적 독립성, 자율성과 신중한 균형 유지(중략)

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.10
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• pp.2054-2061
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• 2015

Biologically inspired modeling techniques have received considerable attention for their robustness, scalability, and adaptability with simple local interactions and limited information. Among these modeling techniques, Gene Regulatory Networks (GRNs) play a central role in understanding natural evolution and the development of biological organisms from cells. In this paper, we apply GRN principles to the WSN system and propose a new GRN model for decentralized node scheduling design to achieve energy balancing while meeting delay requirements. Through this scheme, each sensor node schedules its state autonomously in response to gene expression and protein concentration, which are controlled by the proposed GRN-inspired node scheduling model. Simulation results indicate that the proposed scheme achieves superior performance with energy balancing as well as desirable delay compared with other well-known schemes.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.4
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• pp.809-816
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• 2010

This paper proposed about a load-balanced multi-agent model in mobile distribution environment to monitor moving patients and to deal with a situation of emergency. This model was designed to have a structure based on distribution framework by expanding a mobile system, and provides healthcare services based on real time situational information on moving patients. In order to overcome the limitation of middleware when we design system, we provided an abstract layer between applications and their base network infrastructure so that balance between QoS requests and network life can be maintained. In addition, clustering was used in cells for the efficient load distribution among multi-agents. By using Clustering FCM, we got optimal resources and had solve about transmission delay.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.11B
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• pp.945-952
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• 2006

In hierarchical mobile IPv6 networks, when an inter-domain handover occurs, mobile nodes suffer from excessive signaling traffic and long handover latency, resulting in possible disruption of ongoing connections. Further, the selection of MAP and its load status critically affect the overall system performance. Therefore, we propose a dynamic MAP selection scheme that seeks to distribute load among MAPs as well as reduces inter-domain handovers. Performance is evaluated from not only an analytic model of average signaling cost but also simulation. The analytical and simulation results show that our proposed scheme improves load distributedness and reduces inter-domain handovers and signaling cost compared to another existing IETF based approach.