• 통상정보연구
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• 제10권4호
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• pp.395-416
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• 2008

The advance information for oceangoing cargoes destined to th United States enable CBP to evaluate the potential risk of smuggling WMD and to facilitate the prompt release of legitimate cargo following its arrival in the Unites States. On January 1, 2008, CBP promulgate regulations, also known as 10+2 rule, to require the electronic transmission of additional data elements for improved high-risk targeting, including appropriate security elements of entry data for cargo destined to the United States by vessel prior to loading of such cargo on vessels at foreign seaports. The potential impact to an importer's international supply chain will be as follows ; Firstly, importers will take incremental supply chain costs and filing costs. Secondly, anticipate delay in shipment of containerized cargo. Thirdly, importers could be charged fines if they fail to file and file inaccurate or missing data. Companies exporting to the United States should be interested in 10+2 rule, analyze their current processes and procedures to ensure that they are prepared to handle the additional filing requirements of 10+2 rule. And they should focus on how 10+2 impacts their supply chain in terms of costs and sourcing. They will be necessary to revise service legal agreements with their forwarders, customs brokers or carriers in order to meet filing requirements of 10+2 rule.

• 한국정보통신학회논문지
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• 제8권1호
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• pp.88-95
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• 2004

기존의 Best-effort 응용을 위한 디스크 스케줄링 기법들은 멀티미디어 객체의 실시간성을 만족하지 못하며, 실시간 응용을 위한 디스크 스케줄링 기법들은 시스템의 처리율을 만족시키지 못한다. 따라서, 본 논문에서는 범용 운영체제에서 멀티미디어 객체의 주기적인 연성 실시간 요구와 비 실시간 서비스를 동시에 만족시키는 2 단계 디스크 스케줄링 기법을 제안한다. 제안하는 기법은 실시간 요구와 비 실시간 요구에 적절한 가중치를 부여하는 라운드로빈 기법에 기초하고 있다. 리눅스 커널에서의 실험 결과 실시간 태스크와 비 실시간 태스크 사이의 공정성이 보장됨을 확인하였다.

• 한국문헌정보학회지
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• 제36권3호
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• pp.215-232
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• 2002

도서관 및 정보센터에서 고객의 요구사항을 분석하고 고객이 기대하는 정보서비스 수준에 이르도록 상호 유기적인 프로세스를 시스템 경영을 통해 접근하는 방법이 품질경영시스템이다. 본 연구는 국제적인 품질경영시스템인 ISO 9000 인증제도의 이론적 고찰과 ISO 9000 인증제도의 변천과 인증 추이를 조사하였다. 아울러 이를 국내 도서관 및 정보센터에 효율적으로 적용할 수 있도록 ISO 9000패밀리 규격을 검토하여 도서관 및 정보센터에서 품질경영시스템 인증을 위한 절차와 요구사항을 제시하였고, 도서관 및 정보센터에서의 품질경영시스템 모형을 제시하였다.

• 한국농공학회지
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• 제36권2호
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• pp.44-55
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• 1994

This paper describes the development of real-time irrigation reservoir operation models that adequately allocate available water resources for paddy rice irrigation. Water requirement deficiency index(WRDI) was proposed as a guide to evaluate the operational performance of release schemes by comparing accumulated differences between daily release requirements for irrigated areas and actual release amounts. Seven reservoir release rules were developed, which are constant release rate method (CRR), mean storage curve method(MSC), frequency analysis method of reservoir storage rate(FAS), storage requirement curve method(SRC), constant optimal storage rate method (COS), ten-day optimal storage rate method(TOS), and release optimization method(ROM). Long-term forecasting reservoir operation model(LFROM) was formulated to find an optimal release scheme which minimizes WRDIs with long-term weather generation. Rainfall sequences, rainfall amount, and evaporation amount throughout the growing season were to be forecasted and the results used as an input for the model. And short-term forecasting reservoir operation model(SFROM) was developed to find an optimal release scheme which minimizes WRDIs with short-term weather forecasts. The model uses rainfall sequences forecasted by the weather service, and uses rainfall and evaporation amounts generated according to rainfall sequences.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권9호
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• pp.4144-4165
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• 2018

Software-defined networking (SDN) has emerged as a promising technology for network programmability and experiments. In this work, we focus on virtual network embedding in multiple controllers SDN network. In SDN virtualization environment, virtual SDN networks (vSDNs) operate on the shared substrate network and managed by their each controller, the placement and load of controllers affect vSDN embedding process. We consider controller placement, vSDN embedding, controller adjustment as a joint problem, together considering different quality of service (QoS) requirement for users, formulate the problem into mathematical models to minimize the average time delay of control paths, the load imbalance degree of controllers and embedding cost. We propose a heuristic method which places controllers and partitions control domains according to substrate SDN network, embeds different QoS constraint vSDN requests by corresponding algorithms, and migrates switches between control domains to realize load balance of controllers. The simulation results show that the proposed method can satisfy different QoS requirement of tenants, keep load balance between controllers, and work well in the acceptance ratio and revenue to cost ratio for vSDN embedding.

• 한국통신학회논문지
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• 제33권10B호
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• pp.904-910
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• 2008

본 논문에서는 군의 요구사항을 고려하여 군 통신망의 서비스와 관련 파라미터들을 연구하고, u-Army 실험망을 시뮬레이션을 통해 성능 측정을 하였다. 이를 바탕으로 전 군에 VoIP를 적용할 수 있는 VoIP 설계 가이드라인을 제시하였다. 측정은 패킷과 콜 시그널링 관점에서 지연과 손실에 관하여 몇 가지 시나리오에 대해 측정하였다. 첫 번째는 독립적인 네트워크 서비스에 따라 만족하는 요구사항을 측정하였다. 두 번째는 통합 서비스에서 지연과 손실에 관하여 백그라운드 트래픽을 증가시키면서 그 결과를 측정하였다. 마지막으로 시뮬레이션에 근거하여 IP PBX 장비의 설치 위치에 따라 네트워크의 구성을 분류하여 설계 가이드라인을 제시하였으며, 현재 군의 고정된 링크의 상황에 맞추어 VoIP 단말기의 수를 정할 수 있도록 계산 방법을 제시하였다.

• 한국통신학회논문지
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• 제42권1호
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• pp.257-267
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• 2017

IoT(사물인터넷) 기술이 발전하여 적용 분야가 다양해지고 이에 따라 서비스를 이용하는 사용자 수도 크게 증가하였다. 수많은 IoT 디바이스들에 의해 발생되는 실시간 대용량 데이터를 클라우드 컴퓨팅 환경에서 처리하는 것은 더 이상 적합하지 않다. 이러한 문제를 해결하기 위해서 응답시간을 최소화 하고 실시간 처리가 적합하도록 하는 포그 컴퓨팅이 제안되었다. 하지만 포그 컴퓨팅이라는 새로운 패러다임에 대한 보안 요구사항이 아직 정립되지 않았다. 이 논문에서는 포그 컴퓨팅에 대한 모델 정의와 정의된 모델에 대한 보안 요구사항을 정리하였다.

• 디지털산업정보학회논문지
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• 제6권2호
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• pp.233-245
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• 2010

This paper proposes security architecture, security audit framework, and audit check item. These are based on the security requirement that has been researched in the information system audit. The proposed information security architecture is built in a way that it could defend a cyber attack. According to its life cycle, it considers a security service and security control that is required by the information system. It is mapped in a way that it can control the security technology and security environment. As a result, an audit framework of the information system is presented based on the security requirement and security architecture. The standard checkpoints of security audit are of the highest level. It was applied to the system introduction for the next generation of D stock and D life insurance company. Also, it was applied to the human resources information system of K institution and was verified. Before applying to institutions, system developers and administrators were educated about their awareness about security so that they can follow guidelines of a developer security. As a result, the systemic security problems were decreased by more than eighty percent.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권10호
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• pp.4848-4863
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• 2016

The explosive wireless data service requirement accompanied with carbon dioxide emission and consumption of traditional energy has put pressure on both industria and academia. Wireless networks powered with the uneven and intermittent generated renewable energy have been widely researched and lead to a new research paradigm called green communication. In this paper, we comprehensively consider the total generated renewable energy, QoS requirement and channel quality, then propose a utility based renewable energy allocation policy. The utility here means the satisfaction degree of users with a certain amount allocated renewable energy. The energy allocation problem is formulated as a constraint optimization problem and a heuristic algorithm with low complexity is derived to solve the raised problem. Numerical results show that the renewable energy allocation policy is applicable not only to soft QoS, but also to hard QoS and best effort QoS. When the renewable energy is very scarce, only users with good channel quality can achieve allocated energy.

• Structural Engineering and Mechanics
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• 제69권1호
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• pp.1-10
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• 2019

In the construction of flat plate slabs, which are widely used for tall buildings but have relatively low flexural stiffness, serviceability problems such as excessive deflections and cracks are of great concern. To prevent excessive deflections at service load levels, current design codes require the minimum slab thickness, but the requirement could be unconservative because it is independent on loading and elastic modulus of concrete, both of which have significant effects on slab deflections. In the present study, to investigate the effects of the construction load of shored slabs, reduced flexural stiffness and moment distribution of early-age slabs, and creep and shrinkage of concrete on immediate and time-dependent deflections, numerical analysis was performed using the previously developed numerical models. A parametric study was performed for various design and construction conditions of practical ranges, and a new minimum permissible thickness of flat plate slabs was proposed satisfying the serviceability requirement for deflection. The proposed minimum slab thickness was compared with current design code provisions and numerical analysis results, and it agreed well with the numerical analysis results.