• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권7호
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• pp.2286-2304
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• 2022

Blockchain is a distributed ledger that combines technologies such as cryptography, consensus mechanism, peer-to-peer transmission, and time stamping. The rapid development of blockchain has attracted attention from all walks of life, but storage scalability issues have hindered the application of blockchain. In this paper, a scalable blockchain storage model based on Distributed Hash Table (DHT) and the InterPlanetary File System (IPFS) was proposed. This paper introduces the current research status of the scalable blockchain storage model, as well as the basic principles of DHT and the InterPlanetary File System. The model construction and workflow are explained in detail. At the same time, the DHT network construction mechanism, block heat identification mechanism, new node initialization mechanism, and block data read and write mechanism in the model are described in detail. Experimental results show that this model can reduce the storage burden of nodes, and at the same time, the blockchain network can accommodate more local blocks under the same block height.

• 한국콘텐츠학회논문지
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• 제11권7호
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• pp.192-209
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• 2011

본 연구는 미디어 시장에서 종합편성채널 도입이 확정된 이후 지역 지상파방송사들의 대응전략을 살펴보았다. 종합편성채널 등장으로 시장경쟁력이 취약한 지역 지상파방송은 제한된 광고시장에서 더욱 생존의 어려움에 내몰린다. 그리고 지역 지상파방송은 규제의 측면에서 종합편성채널에 비해 차별적 적용을 받는다. 의무재송신, 방송권역, 편성규제, 광고규제, 방송발전기금 등에서 역차별을 받고 있다. 이에 지역 지상파 방송사는 어려운 미디어 환경에서 다각적인 대응전략이 필요하다. 무엇보다도 경쟁력 있는 콘텐츠 강화가 절실할 때이다. 그러기에 콘텐츠 유통구조를 다원화할 필요가 있다. 지역방송의 유통구조를 확대하기 위한 방법으로, 전국 네트워크 프로그램에 지역프로그램 편성총량제 도입이 강조된다. 지역방송사가 제작한 프로그램이 주시청시간대에 전국 네트워크를 통해 정규적으로 방송될 수 있도록 하는 의무화정책이 그 예이다. 또한 독자적인 우수한 콘텐츠개발로 2차 유통창구의 다원화가 필요하다. 각 지역방송사와 SO 등 다양한 플랫폼에 공급할 수 있도록 해야 한다. 또한 지역방송사간 권역 간, 권역별 공동제작 프로그램을 활성화시킬 필요가 있다. 중앙사와 지역 방송사 간 전파료를 현실적으로 분배해야 하고 지역방송 자체적으로도 수익모델을 광고 이외에 협찬과 자체사업을 확대하여 경쟁력을 강화시켜 자생력을 키워 나가야 할 것이다. 그리고 광역화를 통해 규모의 경제를 확대해야 할 것이다.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2005년도 추계학술대회 및 정기총회
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• pp.180-184
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• 2005

These days, home network connects all home appliances using one of broadband convergence network, is constructed and propagated to more than 10 million house hold. Users can monitor and control statuses of home appliances using mobile terminal through homeserver. For active propagation of home network, high-quality multimedia service is very important. Specially, as digital recorder and digital camera is propagated, new paradigm that private DVDs can be shared in many household shows up. The homeserver is the main part of UbiHome, which can store much multimedia content and through which the user can search and share these contents. For searching and sharing, the metadata of contents is supposed to keep the consistency. These metadata include the description to different format such as Image, movie, and music. Therefore, we intend to provide a RDF model for effectively storing, searching and managing high-quality contents in UbiHome. In this paper, we propose to make Ontology to close semantic approach using RDF/RDF Schema for managing multimedia data in UbiHome. we propose RDF-Based Local Ontology and merging these ontology to RDF-Based Global Ontology.

• 한국항공운항학회지
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• 제22권4호
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• pp.15-24
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• 2014

Low Cost Carrier(LCC)s in Asia Pacific market are expected to record high growth due to the expansion of Open Sky Policy among Korea, Japan, China and South East Asia. As everybody is aware of, LCC is not only saving flight cost but also creates differentiating business model by reducing unnecessary services such as F&B and in-flight duty free sales services. Booming LCCs in Asian market will cause not only Incheon airport but also other local airports in Korea to compete heavily to attract LCCs. For example, Air Asia Group with more than 200 fleet has expanded its alliance network throughout Asia. Therefore this paper has researched a new business model operating a LCC terminal for the hub airport competitiveness. According to analysis result of case study, it was found out, considering increasing airline demand next decade, Incheon airport and other domestic airports in Korea had better change an existing terminal into a LCC Terminal(LCCT) to differentiate airport services and expand its hub network. That is because of economic feasibility, first of all, of securing hub and spoke networking capabilities with airlines and finally of developing commercial facilities customizing LCC passengers' demand.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권12호
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• pp.3868-3888
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• 2022

A widely used social networking service like Twitter has the ability to disseminate information to large groups of people even during a pandemic. At the same time, it is a convenient medium to share irrelevant and unverified information online and poses a potential threat to society. In this research, conventional machine learning algorithms are analyzed to classify the data as either non-rumor data or rumor data. Machine learning techniques have limited tuning capability and make decisions based on their learning. To tackle this problem the authors propose a deep learning-based Rumor Detection Neural Network model to predict the rumor tweet in real-world events. This model comprises three layers, AttCNN layer is used to extract local and position invariant features from the data, AttBi-LSTM layer to extract important semantic or contextual information and HPOOL to combine the down sampling patches of the input feature maps from the average and maximum pooling layers. A dataset from Kaggle and ground dataset #gaja are used to train the proposed Rumor Detection Neural Network to determine the veracity of the rumor. The experimental results of the RDNN Classifier demonstrate an accuracy of 93.24% and 95.41% in identifying rumor tweets in real-time events.

• Smart Structures and Systems
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• 제12권5호
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• pp.501-521
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• 2013

This paper is concerned with static and dynamic shape control of a laminated Bernoulli-Euler beam hosting a uniformly distributed array of resistively interconnected piezoelectric patches. We present an analytical one-dimensional model for a laminated piezoelectric beam with material discontinuities within the framework of Bernoulli-Euler and extent the model by a network of resistors which are connected to several piezoelectric patch actuators. The voltage of only one piezoelectric patch is prescribed: we answer the question how to design the interconnected resistive electric network in order to annihilate lateral vibrations of a cantilever. As a practical example, a cantilever with eight patch actuators under the influence of a tip-force is studied. It is found that the deflection at eight arbitrary points along the beam axis may be controlled independently, if the local action of the piezoelectric patches is equal in magnitude, but opposite in sign, to the external load. This is achieved by the proper design of the resistive network and a suitable choice of the input voltage signal. The validity of our method is exact in the static case for a Bernoulli-Euler beam, but it also gives satisfactory results at higher frequencies and for transient excitations. As long as a certain non-dimensional parameter, involving the number of the piezoelectric patches, the sum of the resistances in the electric network and the excitation frequency, is small, the proposed shape control method is approximately fulfilled for dynamic load excitations. We evaluate the feasibility of the proposed shape control method with a more refined model, by comparing the results of our one-dimensional calculations based on the extended Bernoulli-Euler equations to three-dimensional electromechanically coupled finite element results in ANSYS 12.0. The results with the simple Bernoulli-Euler model agree well with the three-dimensional finite element results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 B
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• pp.804-806
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• 1995

This paper discusses Self-organized Distributed Networks(SODN) as identifier of nonlinear dynamical systems. The structure of system identification employs series-parallel model. The identification procedure is based on a discrete-time formulation. The learning with the proposed SODN is fast and precise. Such properties arc caused from the local learning mechanism. Each local networks learns only data in a subregion. Large number of memory requirements and low generalization capability for the untrained region, which are drawbacks of conventional local network learning, are overcomed in the SODN. Through extensive simulation, SODN is shown to be effective for identification of nonlinear dynamical systems.

• 대한산업공학회지
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• 제15권1호
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• pp.105-116
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• 1989

This study presents an algorithm that determines the optimal configuration of the FMSs with limited local buffers. The algorithm finds the lowest cost configuration, i.e. the number of tools, the number of pallets as well as the number of buffers to be installed in front of each machine in the system. Thus it assures a given production ratio with a minimum cost. In the algorithm, FMSs are considered as the closed queueing network with limited queue length. System performance evaluation is performed using the Block-&-Recirculation model developed by Yao and Buzacott. The algorithm is composed with three steps. The steps are namely i) determination of a lower configuration, ii) derivation of an heuristic solution, and iii) obtaining the optimal solution. The computational efforts required in the algorithm usually lies within the capability of personal computers.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2004년도 학술발표회
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• pp.134-147
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• 2004

Theses days, there are 3 prerequisites for dam building in Korea: First one is how to build the dam safe and stable from the technical points of view. Second one is how to design and construct the dam environmentally sound with the minimum change of the surrounding area of the dam site. Third one is how to activate the local economy of the surrounding area of the dam site in order to make the dam construction sustainable from the social and economical points of view. As far as technical aspects far dam building, there are hardly any problems in dam design and construction in our country. However, there are a little difficulty according to the location of the dam site. In order to fulfill the second option it is believed that a lot of effort should be made to accomplish the second task not only because that fairly large area shall be inundated with water after impounding but also because that ecological environments shall be changed due to change of water environment. Therefore, thoughtful investigation and assessment of the environmental features of the local regions have to be preceded before starting of the dam building. In order to overcome these difficulties Hantan river dam has been declared as an Eco-dam with 3 strategies and 9 activities plan at the design stage after sufficient consideration of the local identities of these region and coupled national plans for surrounding areas. Finally, Eco-tourism with the several coupled network-wise touristic courses, namely PERTH model, has been proposed after thorough analysis of the local identities by the Jahari window to make local economy being activated. Detailed descriptions for 3 strategies and 9 activities plan for declaration of Eco-dam and proposal of Eco-tourism with the network-wise touristic courses will be mentioned in the main content.

• 정보학연구
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• 제5권2호
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• pp.1-9
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• 2002

본 논문은 지역과 사회 탐구 단원을 학생들이 살고 있는 지역 사회인 영월군으로 재구성하고, 이를 웹 기반으로 하는 코스웨어로 구현하여 영월 지역 사회를 조사하고 평가하는 내용을 제시한다. 본 논문에서는 학교 인터넷을 통하여 개별적으로 자기 주도적으로 학습을 하게 하고, 또 전자 메일을 통하여 보고서나 평가 답안을 교사에게 전송하게 하는 상호 작용적인 학습 활동과 피드백을 할 수 있도록 한다. 따라서 학생들이 자신이 살고 있는 영월 지역사회를 이해하는데 큰 효과를 가져왔으며, 나아가 학생들이 지역사회의 발전과 보존을 위해 노력하는 자세를 갖도록 하였다. 이러한 웹 기반 코스웨어 방법이 모든 학교에서 이루어진다면 중학교 학생들에게 자기가 살고 있는 지역 사회와 문화 학습과 인터넷을 이용한 자기 주도적 학습과 정보통신기술 활용 능력 향상에 큰 도움이 될 것이다.