• 디지털융복합연구
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• 제17권2호
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• pp.1-7
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• 2019

우리사회는 점점 고령화사회로 진화하고 있다. 본 연구는 소위 정보소외계층 중 하나인 장노년층을 대상으로 하여, 이들의 디지털정보화 역량이 사회활동에 어떻게 영향을 미치는 지를 밝혀보고자 한다. 이를 위해 2017년 디지털정보격차실태조사 결과를 바탕으로 장노년층의 디지털정보화수준과 사회 활동 만족도 수준과의 관계를 분석하였다. 연구결과 장노년층의 유무선 정보기기 보유 및 인터넷 상시 접속가능 여부 등 디지털접근과 사회 활동 만족도 수준과는 정(+)의 관계를 가지는 것으로 나타났다. 둘째, PC이용능력 및 모바일 디지털기기 이용능력 등 디지털 정보역량수준과 사회활동 만죽도 수준도 정(+)의 관계를 가짐을 알 수 있었다. 셋째, 유선 및 모바일 인터넷 이용여부 등 디지털 정보 활용 등의 수준이 높아 질수록 사회 활동 만족도 수준도 정(+)의 관계로 증가한다는 것을 알 수 있었다. 이를 통해 장노년층에 대한 디지털 정보화 수준을 높일 수 있는 정부의 다양한 정보격차해소 정책이 필요함을 알수 있었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권5호
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• pp.2398-2415
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• 2017

Content-Centric Networking (CCN) is a new Internet architecture with routing and caching centered on contents. Through its receiver-driven and connectionless communication model, CCN natively supports the seamless mobility of nodes and scalable content acquisition. In-network caching is one of the core technologies in CCN, and the research of efficient caching scheme becomes increasingly attractive. To address the problem of unbalanced cache load distribution in some existing caching strategies, this paper presents a neighbor cooperation based in-network caching scheme. In this scheme, the node with the highest betweenness centrality in the content delivery path is selected as the central caching node and the area of its ego network is selected as the caching area. When the caching node has no sufficient resource, part of its cached contents will be picked out and transferred to the appropriate neighbor by comprehensively considering the factors, such as available node cache, cache replacement rate and link stability between nodes. Simulation results show that our scheme can effectively enhance the utilization of cache resources and improve cache hit rate and average access cost.

• Journal of information and communication convergence engineering
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• 제11권3호
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• pp.153-166
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• 2013

A hierarchical time division multiple access (HTDMA) medium access control (MAC) protocol is proposed for clustered mobile underwater acoustic networks. HTDMA consists of two TDMA scheduling protocols (i.e., TDMA1 and TDMA2) in order to accommodate mobile underwater nodes (UNs). TDMA1 is executed among surface stations (e.g., buoys) using terrestrial wireless communication in order to share mobility information obtained from UNs which move cluster to cluster. TDMA2 is executed among UNs, which send data to their surface station as a cluster head in one cluster. By sharing mobility information, a surface station can instantaneously determine the number of time slots in a TDMA2 frame up to as many as the number of UNs which is currently residing in its cluster. This can enhance delay and channel utilization performance by avoiding the occurrence of idle time slots. We analytically investigate the delay of HTDMA, and compare it with that of wellknown contention-free and contention-based MAC protocols, which are TDMA and Slotted-ALOHA, respectively. It is shown that HTDMA remarkably decreases delay, compared with TDMA and Slotted-ALOHA.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권11호
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• pp.5234-5251
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• 2018

It is well-known that virtualization technology can bring many benefits not only to users but also to service providers. From the view of system security and resource utility, higher resource sharing degree and higher system reliability can be obtained by the introduction of virtualization technology in distributed cloud. The small size time-sharing multiplexing technology which is based on virtual machine in distributed cloud platform can enhance the resource utilization effectively by server consolidation. In this paper, the concept of memory block and user satisfaction is redefined combined with user requirements. According to the unbalanced memory resource states and user preference requirements in multi-virtual machine environments, a model of proper memory resource allocation is proposed combined with memory block and user satisfaction, and at the same time a memory optimization allocation algorithm is proposed which is based on virtual memory block, makespan and user satisfaction under the premise of an orderly physical nodes states also. In the algorithm, a memory optimal problem can be transformed into a resource workload balance problem. All the virtual machine tasks are simulated in Cloudsim platform. And the experimental results show that the problem of virtual machine memory resource allocation can be solved flexibly and efficiently.

• 국제초고층학회논문집
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• 제11권2호
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• pp.87-102
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• 2022

In Japan, the population progresses to the extreme aging society and it is entering the phase of the population decrease while the population increase is continuing in the world. The construction market is expected to shrink accordingly, however the situation of labor shortage is expected to continue at a faster rate, because the aging of construction workers is progressing and new younger labor force cannot be secured. In order to supplement the labor shortage, it is required to progress mechanization, automation, labor saving, and efficiency improvement by utilizing the information well in each stage in a series of flow of planning, design, construction, operation, and disassembly in one building. The measures to maintain and expand the construction market by the new efficiency improvement techniques which enhance the utilization degree of building information are required. Currently, the elemental technologies which utilized BIM (Building Information Modeling) are accumulated by advancing digitization in each phase. DX (Digital transformation) in the construction industry can be achieved by the technology maturing and having a series of continuities. It is anticipated that this will evolve to a new method which is unprecedented. Present status of BIM and mechanized constructions in Taisei Construction are introduced, and future prospect is described.

• 현장농수산연구지
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• 제26권2호
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• pp.14-24
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• 2024

To enhance the usability of smart agriculture, methods for utilizing smart farm data are required. Therefore, this study proposes a scheme for utilizing regional smart farm data by linking it to services. The current status of domestic and foreign smart farm data collection and linkage services is analyzed. To collect and link regional smart farm data, necessary data collection, data cleaning, data storage structure and schema, and data storage and linkage systems are proposed. Based on the standards currently being implemented for regional smart farm internal data storage, a farm schema, environmental information schema, facility control information schema, and growth information schema are designed by extending the crop schema and crop main environmental factor information database schema. A data collection and management system structure based on the Hadoop Ecosystem is designed for data collection and management at regional smart farm data centers. Strategies are proposed for utilizing regional smart farm data to provide smart farm productivity improvement and revenue optimization services, image-based crop analysis services, and virtual reality-based smart farm simulation services.

• 전자공학회논문지S
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• 제35S권2호
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• pp.50-57
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• 1998

In this paper, we propoe a log N-stage ATM concentator. ATM concentrator is used in the ATM access network to concentrate the traffic offered at UNI, so that high utilization of the newtork rewources is achieved. The concetrator may be used as a construction block in the design of ATM switch. We define abasic element, named equalizer, and decribe its function and theory to construct an efficient concentrator using the element. In addition, a control scheme to enhance the concentrator to a superconcentrator is presented, which enables the concentration to start from an arbitrary output. This scheme makes it possible to construct an efficient ditributior or a barrel shifter which are often used in ATM switch and other application. The proposed concentrator has a low hardware complexity of O(N log N), thus it is economical to implement. Also, the time complexity of proposed concentrator for determining the rouging is O(N log N), which is faster than that of the existing ones.

• Journal of Community Nutrition
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• 제5권2호
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• pp.59-64
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• 2003

The National Nutrition Survey in Japan (NNS-J) started in 1945 and has provided information on dietary intake and health status of Japanese citizens to the public and policymakers for more than half a century. We summarized several relevant issues on the survey in this report : the current framework of the NNS-J in accordance with the Nutrition Improvement Law, utilization of the survey for nutrition and health policy in Japan, the Health Promotion Law recently enacted in 2003, the national plan for health promotion and disease prevention (Health Japan 21), and possible measures to improve the survey systems under the new law. We also mentioned implementation structures of regional health and nutrition surveys, because the Health Promotion Law designates an active role of local governments on promoting health for their citizens, which will enhance the needs for appropriate assessment of health and nutrition conditions in each community as well as the monitoring at the national level. (J Community Nutrition 5(2) : 59-64,2003)

• 수산해양교육연구
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• 제15권2호
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• pp.184-192
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• 2003

When the present Learning System for Computer-Related Subjects Using WBI is implemented on the Web with the above characteristics to help students to study computer subjects without any limitations of time or space, they can easily attain the goals of learning, have computer-utilizing abilities or information capacity, and enhance their capabilities for self-initiative learning. This system enables the learners to carry out 'plan-do-see' for the contents of learning initiatively. The learners can study the practice part of the curriculum using multi-media, such as motion pictures, voices, images, and sound effects, vividly with a sense of actual presence. It helps the students to have an active attitude toward leaning afterward. without meeting the teacher or without any storage media, the leaners can submit their assignments or materials for performance evaluation via the Internet.

• Journal of Smart Tourism
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• 제1권2호
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• pp.27-36
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• 2021

As a popular concept, smart tourism is widely used as a strategic tool to improve the competitiveness of world tourism destinations. Taking Macao as a case study, this research explores the relationship between government, academic research, and smart destination applications, with a view toward investigating the utilization of smart technology to achieve service innovation, effective communication with tourists, and enhance the travel experience. The study summarizes the current situation of smart tourism in Macao, finding that most of the smart services in Macao rely on users to obtain information spontaneously and do not achieve real interaction and service demand. Suggestions and advice for smart development are provided.