• Journal of Communications and Networks
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• v.3 no.4
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• pp.334-341
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• 2001

The provision of QoS control is a key of the successful deployment of multimedia networks. Buffer management plays an important role in QoS control. Therefore, this paper proposes a novel QoS buffer management algorithm named GREEN (Global Random Early Estimation for Nipping), which extends the concepts of ERD (early random drop) and RED (random early detection). Specifically, GREEN enhances the concept of "Random" to "Global Random" by globally considering the random probability function. It also enhances the concept of "Early" to "Early Esti mation" by early estimating the network status. For performance evaluation, except compared with RED, extensive simulation cases are performed to probe the characteristics of GREEN.

• Journal of Positioning, Navigation, and Timing
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• v.9 no.4
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• pp.405-409
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• 2020

This paper proposes time management system for unmanned aerial vehicle (UAV) network. The computers of the UAVs need time synchronization that time offset does not exceed the minimum interval of data samples for errorless data blending between the computers. The proposed time management system is composed of time synchronization and general management systems for UAV control. The systems communicate each other for time information and control signals. The synchronization system uses improved version of existing time offset estimation that network time protocol (NTP) uses. The time synchronization is operated when the time offset of any UAV exceeds threshold that preconfigured by the general management system. The demonstration of prototype shows stable time synchronization satisfying preconfigured threshold.

• Journal of Information Technology Services
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• v.8 no.3
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• pp.101-109
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• 2009

For half a century, PMM(Project Management Model) continually has been advanced by many researchers and managers. Especially, the model for civil and construct engineering has now high maturity, but the model for IT engineering has not acceptable maturity. PMI(Project Management Institute) provides the knowledge of protect management for general purpose, it is not adequate for IT prefect management without complements. In this paper, we propose IT project management model based the knowledge of PMI using UML. IT project management model provides not only functions for project planning, budgeting, design and Implement, but also the knowledge for managing IT protect efficiently. We use uses case diagrams to describe the details of the model. We expect the model to be used in management of IT project efficiently in public sector.

• International conference on construction engineering and project management
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• 2017.10a
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• pp.321-327
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• 2017

China is experiencing the urbanization at an unprecedented speed and scale in human history. The continuing growth of China's big cities, both in city land and population, has already led to great challenges in China's urban planning and construction activities, such as the continuous increase of construction and demolition (C&D) waste. Therefore, how to characterize cities' construction activities, particularly dynamically quantify the flows of building materials and construction debris, has become a pressing problem to alleviate the current shortage of resources and realize urban sustainable development. Accordingly, this study is designed to employ 4D-GIS (four dimensions-Geographic Information System) and Internet Plus to offer new approach for accurate but dynamic C&D waste management. The present study established a spatio-temporal pattern and material metabolism evolution model to characterize the geo-distribution of C&D waste by combing material flow analysis (MFA) and 4D-GIS. In addition, this study developed a mobile application (APP) for C&D waste trading and information management, which could be more effective for stakeholders to obtain useful information. Moreover, a cloud database was built in the APP to disclose the flows of C&D waste by the monitoring information from vehicles at regional level. To summarize, these findings could provide basic data and management methods for the supply and reverse supply of building materials. Meanwhile, the methodologies are practical to C&D waste management and beyond.

• Journal of information and communication convergence engineering
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• v.22 no.2
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• pp.121-126
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• 2024

In enterprise environments, file owners are often required to share critical files with other users, with encryption-based file delivery systems used to maintain confidentiality. However, important information might be leaked if the cryptokey used for encryption is exposed. To recover confidentiality, the file owner must then re-encrypt and redistribute the file along with its new encryption key, which requires considerable resources. To address this, we propose a key management server that minimizes the distribution of encryption keys when critical files are compromised, with unique encryption keys assigned for each registered user to access critical files. While providing the targeted functions, the server employs a level of system resources comparable to that of legacy digital rights management. Thus, when implemented in an enterprise environment, the proposed server minimizes cryptokey redistribution while maintaining accessibility to critical files in the event of an information breach.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2002.11a
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• pp.9-15
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• 2002

PDM(Product Data Management)은 제품정보 및 개발 프로세스를 관리하는데 많은 이점이 있는 도구로써 인식되어 왔으며, 제품 설계, 제작, 건설, 유지, 보수하는데 필요한 많은 양의 데이터 및 정보를 효율적으로 관리할 수 있다. PDM은 일반적으로 EDM(engineering data management), DM(document management), PIM(product information management), TDM(technical data management), TIM(technical information management) 등으로 알려진 기술의 보다 더 일반화된 개념이다.(중략)

• IE interfaces
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• v.20 no.3
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• pp.327-332
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• 2007

Because the coins of about 920 billion are hoarded during these ten years, the national treasury of about 35 billion wons is wasted in minting coins every year. In this paper we promote to revitalize the circulation of coins through the connection with the financial world. Firstly embedded software that is contained in the coin banking ATM is developed. Then we developed new business process model that does customer spend coins efficiently in online through this system. The system constructed in this paper can contribute to the public interest and the marketability of the nation because of reducing waste of the national treasury and improving utilization and negotiability of coins.

• Industrial Engineering and Management Systems
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• v.4 no.2
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• pp.207-217
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• 2005

Business mergers are a direct result of rapid changes in the current corporate environment. They are occurring in many industries, including financial institutions. As information systems prove increasingly indispensable in the integration of companies’ business systems, information system integration is becoming increasingly necessary. However, in many cases such integration does not work well. Therefore, this paper proposes a new framework using both IS integration model and IS integration phases to analyze systems failure in IS integration.

• Industrial Engineering and Management Systems
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• v.6 no.1
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• pp.28-39
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• 2007

The issue of customer-centric enterprise focusing on realizing customer needs has recently received considerable attention in the corporate world. However, little research has yet been reported on developing Information Systems (IS) supporting the customer-centric enterprises. This research proposes an integrated approach of IS development that supports organizations aiming to become customer-centric enterprises using various customer profiles. In this paper, we propose an integrated approach unifying goal modeling, business process modeling, and information systems modeling. The approach is expected to be seamlessly linked with the object-oriented systems development approach. Finally, we apply this approach to the real case of a securities company in Japan.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2008.02a
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• pp.143-146
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• 2008

인터넷의 발전은 온라인상의 무한한 정보 이용을 가능케 하였다. 인터넷 상의 무한한 정보에는 유익한 정보도 있지만 그렇지 못한 유해한 정보도 있다. 대표적인 유해 정보인 음란물 사이트는 청소년들에게 쉽게 노출되어 심신건강에 악영향을 끼친다. 최근에는 이러한 음란물 사이트를 차단하기 위한 알고리즘 개발이 활발히 진행되고 있다. 본 논문에서는 음란물 사이트 차단을 위해 연구되고 있는 대표적인 알고리즘들의 성능 비료를 통하여 각 알고리즘의 취약점을 보완할 수 있는 새로운 방법론을 제시한다.