• 아동학회지
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• 제33권2호
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• pp.185-201
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• 2012

The purpose of the present study was to investigate the structural relationships between adolescent problem behaviors and related variables. The subjects of this study consisted of 250 to second graders from a middle school in S city in the Gyeongbuk province of South Korea. The sample variance-covariance matrix was analyzed using AMOS 20.0, and a maximum likelihood minimization function. The results were as follows : First, marital conflict in terms of the father's open communication model indicated both a direct and indirect effect upon adolescent problem behaviors. Marital conflict in terms of the father's problematic communication model revealed an indirect effect upon adolescent problem behaviors also indicated that these behaviors were also mediated by the father's problems communication. Second, a open communication style on the part of the father indicated a partially mediating effect on the relationship between marital conflict and adolescent problem behaviors. The problematic communication model on the part of the father revealed a very clear mediating effect on the relationship between marital conflict and adolescent problem behaviors.

• Journal of Communications and Networks
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• 제12권6호
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• pp.592-599
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• 2010

In recent years, significant improvements have been made to the techniques used for analyzing satellite communication and attacking satellite systems. In 2003, a research team at Los Alamos National Laboratory, USA, demonstrated the ease with which civilian global positioning system (GPS) spoofing attacks can be implemented. They fed fake signals to the GPS receiver so that it operates as though it were located at a position different from its actual location. Moreover, Galileo in-orbit validation element A and Compass-M1 civilian codes in all available frequency bands were decoded in 2007 and 2009. These events indicate that cryptography should be used in addition to the coding technique for secure and authenticated satellite communication. In this study, we address this issue by using an authenticated key-exchange protocol to build a secure and authenticated communication channel for satellite communication. Our protocol uses identity-based cryptography. We also prove the security of our protocol in the extended Canetti-Krawczyk model, which is the strongest security model for authenticated key-exchange protocols, under the random oracle assumption and computational Diffie-Hellman assumption. In addition, our protocol helps achieve high efficiency in both communication and computation and thus improve security in satellite communication.

• 한국통신학회논문지
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• 제18권2호
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• pp.192-201
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• 1993

통신기술이 발전함에 따라 통신망이 아날로그 전송 형태로부터 디지털 전송 형태로 바뀌고 있으며, 궁극적으로는 end-to-end 디지털 통신을 실현하는 종합정보통신망(ISDN)으로 변천하고 있다. 이러한 통신망의 변천에 따라 새로운 망의 설치 및 운용과 더불어 통신의 효율화와 선진화를 달성하기 위한 통화품질의 향상도 중요한 과제로 부각되고 있다. 또한, 새로운 디지털 음성 통신계에서는 통화품질에 영향을 주는 요인들이 기존 아날로그 형태의 음성 통신계와는 다르게 나타나기 때문에 새로운 통화품질의 조건 및 기준을 확립할 필요가 있다. 본 논문에서는 음성통신과 통화품질과의 관계를 설명하고, 디지틀 음성통신계의 통화품질을 설계하기 위한 평가 실험용 디지틀 통화모델 시스템의 설계 및 개발에 대하여 기술한다. 또한, 구현한 모델 시스템의 몇가지 활용을 제안한다.

• 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.

• 한국전자거래학회지
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• 제1권1호
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• pp.159-171
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• 1996

Nowadays, multimedia and Hypermedia become hot topics in information industry. Due to high capacity of media storage and fast communication network, it is possible to exchange text data as well as image, moving picture and voice. Especially to apply hypermedia under CALS standard environment, the relation between international standard and CALS standard needs to be considered. This study introduces conceptual background and processing model of HyTime (Hypermedia Time-based Structuring Language) which is a specification of hypermedia exchange, Hyper ODA (Hyper Open Document Architecture) which is a major multimedia communication basis, MMCF (Multimedia Communication Forum), AHM(Amsterdam Hypermedia Model), and DSRM(DAVIC System Reference Model) reference model which helps determination of hypermedia communication specification Although they are international standard, provisional standard or non-standard, it discusses the Possibility of adopting them as CALS standard. Hence, this paper chooses the best recommend for CALS among these models.

• 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.

• ETRI Journal
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• 제37권3호
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• pp.439-449
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• 2015

Human body communication (HBC) is being recognized as a new communication technology for mobile and wearable devices in a body area network (BAN). This paper presents co-channel interference experienced by HBC supporting the physical layer in the IEEE 802.15.6 BAN standard. To analyze the co-channel interference, a co-channel interference model is introduced, and space-domain and time-domain parameters representing an interference environment are generated using the co-channel interference model. A new signal-to-interference ratio (SIR) parameter depending on the peak amplitudes of the data signals causing co-channel interference is defined; co-channel interference can be easily analyzed and modelled using the newly defined SIR. The BER degradation model derived using the co-channel interference model and SIR in this paper can be effectively used to estimate the performance.

• 대한가정학회지
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• 제40권9호
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• pp.175-189
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• 2002

The purpose of this study was to test a structural model about family income as causally related to family hardiness, pile-up stress, communication, and family adaptation in families of children with disabilities. 250 families of children with disabilities participated as subjects. The models were developed on the basis of confirmatory factor analysis and compared using covariance structure modeling(LISREL). Adequate fitness of the model was observed. Family income showed negative effect on pile-up stress and positive effect on family adaptation. Pile-up stress showed negative effect on family hardiness. Family hardiness showed positive effect on family communication, and family communication showed positive effect on family adaptation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.101-102
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• 2011

The attraction force is an important parameter for permanent-magnet(PM) linear machines. This paper aims to analysis lumped magnetic circuit model of a magnetic levitation system. It accounts for the fringing effect and leakage flux which may greatly affect the accuracy of the analytical model for the optimal lumped magnetic circuit model. consequentially it will be able to apply to prospective permanent-magnet(PM) linear machines for accurate analysis.

• 한국음향학회지
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• 제18권8호
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• pp.100-107
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• 1999

셀룰라 방식의 마이크로셀 및 피코셀 이동통신에서 가입자 서비스가 시가지의 중심 도로를 따라 이루어지는 경우, 도심의 이동통신 전파환경을 보다 신속하고 정확히 해석할 수 있는 전파예측 모델을 제안한다. 그리고 PCS 이동통신 도심 전파환경의 가정하에 제안 전파예측 모델을 시뮬레이션하여 셀 내 지역별 수신 전계강도 분포를 분석하고 그 결과로서 마이크로셀 및 피코셀 이동통신 기지국의 최적 출력과 위치 조건을 제시한다.