• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.178-179
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• 2011

The exchange of information with legacy systems is a main issue in the era of SMARTGRID. Because WAMAC(Wide Area Monitoring and Control) system has monitoring function, as well as control function, it is very necessary for WAMAC to exchange data and information with SCADA(Supervisory Control and Data Acquisition) / EMS(Energy Management System). IEC 61970 CIM(Common Information Model) is an abstract model that represents all the major objects in an electric utility enterprise typically involved in utility operations. In this paper, a proposal that adopting CIM to WAMAC model be submitted so that the integration of various legacy system and application for itself be able to be flexible.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제14권2호
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• pp.135-145
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• 2011

우리나라의 2007개정 수학과 교육과정에서는 의사소통 능력의 신장을 수학과 교육 목표의 중요한 부분으로 설정하고 있다. 수학적 의사소통은 학생들이 자신의 사고 과정을 재정립하고, 다른 사람과 상호작용하면서 지식을 구성해 나가는데 중요한 수단이 된다. 이 논문에서는 수학 교실에서 수학적 의사소통 능력을 신장시키기 위한 방안으로 수학적 의사소통 모형을 개발하고, 개발된 의사소통 모형에 따른 수업과 전통적인 교사 중심의 설명식 수업에서 지식의 형성 과정을 비교 분석하였다. 개발된 교수-학습 모형에 따른 수업에서는 전통적인 교사 중심의 설명식 수업에 비해 자신의 문제 해결 방법을 모둠원들과 의사소통을 통해 상호 비교하고, 자신의 의견을 수정하여 가장 적절한 해결 방법을 찾고 합의하였다. 이런 과정을 통해 학생들은 주관적 지식을 객관적 지식으로 구성해 나갔다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1993년도 Fifth International Fuzzy Systems Association World Congress 93
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• pp.857-860
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• 1993

In this paper, we apply the self generating neuro fuzzy model (SGNFM) to the dimension analysis of the chaotic time series. Firstly, we formulate a nonlinear time series identification problem with nonlinear autoregressive (NARMAX) model. Secondly, we propose an identification algorithm using SGNFM. We apply this method to the estimation of embedding dimension for chaotic time series, since the embedding dimension plays an essential role for the identification and the prediction of chaotic time series. In this estimation method, identification problems with gradually increasing embedding dimension are solved, and the identified result is used for computing correlation coefficients between the predicted time series and the observed one. We apply this method to the dimension estimation of a chaotic pulsation in a finger's capillary vessels.

• 한국정보처리학회논문지
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• 제4권10호
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• pp.2544-2552
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• 1997

본 논문은 병렬 프로토콜 구현을 위해서 (1)채널통신 모델, (2)포크-조인 모델, (3)사건조회 모델이라 부르는 3 가지 유형의 다중 프로세스 모델을 제시한다. 각 모델에 대한 병렬화 사양을 위해서 병렬 프로그래밍 언어인 Par. C System을 사용한다. 제안한 다중 프로세스 모델의 성능을 측정하기 위하여 인터넷 프로토콜 스택의 Internet Protocol (IP)을 Transputer상에서 구현한다. IP 프로토콜 기능은 송신측과 수신측으로 분리하고 양측의 병렬화는 Multiple Instruction Single Data(MISD) 구조를 이용한다. 제안한 모델들은 다양한 실행시간 과부하에 대하여 성능 평가와 비교 분석을 한다. 즉, 채널통신 모델에서는 채널을 경유한 사건 송신, 포크-조인 모델에서는 프로세스 생성, 그리고 사건조회 모델에서는 프로세스간 문맥전환시에 발생하는 과부하를 송신측과 수신측에 대하여 성능을 분석한다. 송신측의 성능 측정 결과, 사건조회 모델이 채널통신 모델과 포크-조인 모델과 비교하여 77%와 9%의 빠른 처리 시간을 보였다. 수신측에서는 포크-조인 모델이 채널통신 모델과 사건조회 모델과 비교하여 55%와 107%의 빠른 처리 시간을 보였다.

• 대한임베디드공학회논문지
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• 제5권2호
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• pp.67-76
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• 2010

Although both functional verification and performance evaluation are necessary for the development of effective and reliable communication systems, they have been often performed independently; by functional modeling with formal language tools and by performance modeling with professional network performance evaluation tools, respectively. Separate and repeated modeling of one system, however, would often result in cost increase and inconsistency between the models. This paper proposes an integrated model design approach in order to overcome this problem that evaluates the performance of a communication protocol designed in SDL with SDL-OPNET model conversion. The proposed technique generates OPNET skeleton code from Tau-generated C code of the SDL model by analyzing the relations between SDL and OPNET models. IEEE 802.2 LLC protocol was used as an example of model conversion to show the applicability and effectiveness of the proposed technique.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권10호
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• pp.4698-4716
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• 2017

Wireless signal transmission is influenced by environmental effects. These effects have also been challenging for Vehicular Ad hoc Network (VANET) in real-time communication. More specifically, in an urban environment, with high mobility among vehicles, a vehicle's status from the transmitter can instantly trigger from line of sight to non-line of sight, which may cause loss of real-time communication. In order to overcome this, a deterministic signal propagation model is required, which has less complexity and more feasibility of implementation. Hence, we propose a realistic path loss model which adopts ray tracing technique for VANET in a grid urban environment with less computational complexity. To evaluate the model, it is applied to a vehicular simulation scenario. The results obtained are compared with different path loss models in the same scenario based on path loss value and application layer performance analysis. The proposed path loss model provides higher loss value in dB compared to other models. Nevertheless, the performance of vehicle-vehicle communication, which is evaluated by the packet delivery ratio with different vehicle transmitter density verifies improvement in real-time vehicle-vehicle communication. In conclusion, we present a realistic path loss model that improves vehicle-vehicle wireless real-time communication in the grid urban environment.

• 산업경영시스템학회지
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• 제41권1호
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• pp.39-49
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• 2018

In the satellite operation phase, a ground station should continuously monitor the status of the satellite and sends out a tasking order, and a satellite should transmit data acquired in the space to the Earth. Therefore, the communication between the satellites and the ground stations is essential. However, a satellite and a ground station located in a specific region on Earth can be connected for a limited time because the satellite is continuously orbiting the Earth, and the communication between satellites and ground stations is only possible on a one-to-one basis. That is, one satellite can not communicate with plural ground stations, and one ground station can communicate with plural satellites concurrently. For such reasons, the efficiency of the communication schedule directly affects the utilization of the satellites. Thus, in this research, considering aforementioned unique situations of spacial communication, the mixed integer programming (MIP) model for the optimal communication planning between multiple satellites and multiple ground stations (MS-MG) is proposed. Furthermore, some numerical experiments are performed to verify and validate the mathematical model. The practical example for them is constructed based on the information of existing satellites and ground stations. The communicable time slots between them were obtained by STK (System Tool Kit), which is a well known professional software for space flight simulation. In the MIP model for the MS-MG problems, the objective function is also considered the minimization of communication cost, and ILOG CPLEX software searches the optimal schedule. Furthermore, it is confirmed that this study can be applied to the location selection of the ground stations.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권6호
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• pp.2838-2858
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• 2019

Traditional channel models for vehicle-to-vehicle (V2V) communication usually assume fixed velocity in static scattering environment. In the realistic scenarios, however, time-variant velocity for V2V results in non-stationary statistical properties of wireless channels. Dynamic scatterers with random velocities and directions have been always utilized to depict the non-stationary statistical properties of the channel. In this paper, a non-stationary geometry-based cooperative scattering channel model is proposed for multiple-input multiple-output (MIMO) V2V communication systems, where a birth-death process is used to capture the appearance and disappearance dynamic properties of moving scatterers that reflect the time-variant time correlation and Doppler spectrum characteristics. Moreover, our model has more straight and concise to study the impact of the vehicular traffic density on channel characteristics and thus avoid complicated procedure in deriving the analytical expressions of the channel parameters and functions. The numerical results validate our analysis and demonstrate that setting important parameters of our model can appropriately build up more purposeful measurement campaigns in the future.

• 수산해양교육연구
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• 제23권3호
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• pp.486-502
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• 2011

The purpose of this study is to investigate the model of curriculum supervision that can substantialize the educational value by studying actual condition and problems of present curriculum supervision. And this study focuses on reciprocal actions based on communication and dialogs. As the model of supervision mentioned above, this research proposes the supervision model of curriculum based on narrative. We need to move the view point of bureaucratic administrative supervision to new vision. For the supervision matched with this new approach, the teachers' experience has to be reinforced by dialogs and communication between school members and the person in charge of supervision in the mood of respect. The educative value of school can be recovered by the narrative through interaction, respecting school members' experience and meanings in their life according to personal practical knowledge based on teacher's experience, forming the school community by mutual communication, and constructing school culture coping with change of new environment.

• 한국전자통신학회논문지
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• 제18권5호
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• pp.885-894
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• 2023

본 연구는 1인 창업에 대한 경제적 어려움과 리소스(resource) 부족으로 극복할 수 있는 다양한 마케팅 모델을 조사하고 분석하였다. 이전의 연구에서는 통합 마케팅 커뮤니케이션모델에 중점을 두고 진행하였기에 융합적 논의가 부족하였다. 본 연구에서는 포괄적 분석과 시점의 변화를 고려한 역할을 파악하여 IT 콘텐츠 마케팅 커뮤니케이션 모델에 중점을 두고 진행하였다. 그 결과, IT 콘텐츠 커뮤니티 모델을 융합적 가치사슬(Value Chain)방식으로 통합하여 IT 콘텐츠 모델을 개선하고 브랜드 성장과 온라인 프레젠테이션 강화를 도모할 수 있는 새로운 전략적 접근법을 제안할수 있었다. 이를 통해 브랜드 인지도를 효과적으로 높일 수 있는 기반 시설을 마련하게 되었으며, 구체적인 가이드라인을 제공하여 1인 창업의 지속적 성장을 지원하는 방안을 제시할수 있게 되었다.