• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 춘계학술대회 특별세미나. 특별세션
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• pp.47-59
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• 2006

This study is about a feasibility study for the practical using Urban Transit Maglev system based on systems engineering. First of all we defined what phase is matched with the project for feasibility study in the system life cycle and identified tasks that shall be done in the phase. Finally we suggested how to do in this project. The Urban Transit Maglev system is not wholly new system. It has similar architecture to a legacy urban railway system. But it is the system that is partially introduced new technology, because there are many projects have this characteristic within the country, we expect that this study may provide references.

• 한국전자거래학회지
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• 제3권1호
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• pp.23-41
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• 1998

In a centralized database system, all system components reside at a single platform. In recent years there has been a rapid trend toward the integration of information systems over multiple sites that are interconnected via a communication network, and users' needs are changed to integration of multiple information sites. Multi database System is one of solutions for integrating distributed heterogeneous databases. However the problems in multi database system are restriction in distributed environment support, limitation in integrating heterogeneous media type data, static integration, and data-only of integration. In order to solve these problems, we propose a hybrid database integration model, HyDIM. HyDIM is used for the integrating legacy multimedia data, adopting CORBA, MDS, and mediator. We demonstrate a prototype system far PDM application domain.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.590-591
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• 2007

Legacy utilities can not adapt to changing business conditions without having complete control of operational systems and a flexible infrastructure that supports change. What is needed is a framework that enables data to be coalesced and transformed in to usable knowledge. This framework should be robust enough to that as new situations arise, information can be shared in ways not previously anticipated. Utility Integration Bus (UIB) provides an integration framework which solves many of these issues while controlling complexity. This paper provides UIB's overview and course.

• 산업공학
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• 제19권4호
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• pp.333-341
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• 2006

RFID (Radio Frequency Identification) is a technology that can input identification information to microchip and make goods, animals, persons recognized, chased, and managed using radio frequency, and is founded on the core technology of ubiquitous environment of the future. In this paper, we propose a RFID integrated system designed to manage the lifecycle of an individual product efficiently. The proposed system can enable traceability and visibility of items through their entire life by integrating distribution and banking information on the basis of EPCglobal Network. It may provide the infra of Digital Manufacturing and RTE (Real Time Enterprise) and effective information sharing structure with existing legacy system (ERP, CRM, SCM) by real time.

• 한국군사과학기술학회지
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• 제16권6호
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• pp.819-827
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• 2013

Compared to legacy frequency hopping communications, future radio communications are required the secure and high data rate, ad-hoc network communication. In this paper, we have designed the network communication structure on the frequency hopping mode, and analyzed the performance of synchronization on the frequency hopping network radio systems. The design results are shown the initial sync. phase of approximately 9 hops and the traffic packet phase of approximately 30 hops. Also, we have simulated the performance on the communication conditions which are carrier bandwidth of 50kHz, user data rate of 64kbps and OQPSK modulation scheme in AWGN. In the simulation, we analyzed the correlation and the performance of synchronization success. The result of simulation show 99% probability for synchronization success at $E_b/N_o$ -4dB.

• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2003년도 추계학술대회
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• pp.609-615
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• 2003

본 논문은 레거시 시스템을 컴포넌트 기반 시스템으로 재공학하는 절차 및 기법을 제공하는 마르미-RE의 전체 단계 중 계획 단계에 대한 상세한 프로세스를 서술한다. 계획 단계는 11개의 작업으로 이루어져 있고, 이들은 각각 4개의 활동인 현황 파악, 개선 비즈니스 도출, 개선 전략 수립, 개발 계획 수립으로 그룹핑 된다. 현황 파악 활동은 업무의 전반적인 정보 분석을 통해 조직의 구조와 업무의 흐름 및 문제점을 파악하고, 개선 비즈니스 모델 도출은 유스케이스 모델링과 객체 모델링을 통해 사용자의 요구사항을 수집하여 개선 업무 모델을 도출한다. 개선 전략 수립 활동은 변환을 위한 전략을 수립하고, 마지막으로 개발 계획 수립 활동에서 변환을 위한 프로젝트 계획서가 작성된다.

• Journal of Positioning, Navigation, and Timing
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• 제11권4호
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• pp.341-349
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• 2022

When designing a new RNSS signal, the performance analysis for the legacy signal providing the same service, is required to determine the performance requirements. However, there are few studies on the secured service (SS) signal performance analysis, and the waveform is the only published information on the signal design component of the SS signal. Therefore, in this paper, we introduce several figures-of-merit (FoMs) that can be used for performance analysis in terms of the waveform. And then, we calculate the FoMs, such as autocorrelation main peak to secondary peak ratio (AMSR), spectral efficiency, Gabor bandwidth, multipath error, and jamming resistance quality factor, for the existing SS signals and discuss the analysis results. Finally, we conclude that the superior waveform for each FoM is different, and that the consideration of the trade-off relationship between the FoMs is required for waveform design.

• Journal of Information Processing Systems
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• 제19권4호
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• pp.450-464
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• 2023

To address the problems of large system overhead and low timeliness when dealing with task scheduling in mobile edge cloud computing, a task scheduling and resource management strategy for edge cloud computing based on an improved genetic algorithm was proposed. First, a user task scheduling system model based on edge cloud computing was constructed using the Shannon theorem, including calculation, communication, and network models. In addition, a multi-objective optimization model, including delay and energy consumption, was constructed to minimize the sum of two weights. Finally, the selection, crossover, and mutation operations of the genetic algorithm were improved using the best reservation selection algorithm and normal distribution crossover operator. Furthermore, an improved legacy algorithm was selected to deal with the multi-objective problem and acquire the optimal solution, that is, the best computing task scheduling scheme. The experimental analysis of the proposed strategy based on the MATLAB simulation platform shows that its energy loss does not exceed 50 J, and the time delay is 23.2 ms, which are better than those of other comparison strategies.

• Journal of information and communication convergence engineering
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• 제22권2호
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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.

• ETRI Journal
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• 제34권6호
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• pp.827-837
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• 2012

We propose a flow admission control (FAC) for setting up a wire-speed connection for new flows based on their negotiated bandwidth. It also terminates a flow that does not have a packet transmitted within a certain period determined by the users. The FAC can be used to provide a reliable transmission of user datagram and transmission control protocol applications. If the period of flows can be set to a short time period, we can monitor active flows that carry a packet over networks during the flow period. Such powerful flow management can also be applied to security systems to detect a denial-of-service attack. We implement a network processor called a flow management network processor (FMNP), which is the second generation of the device that supports FAC. It has forty reduced instruction set computer core processors optimized for packet processing. It is fabricated in 65-nm CMOS technology and has a 40-Gbps process performance. We prove that a flow router equipped with an FMNP is better than legacy systems in terms of throughput and packet loss.