• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.12A
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• pp.994-1005
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• 2011

In this paper, we propose a novel approach to optimize the movement of mobile sink node, called AMSP(Adaptive Mobile Sink Path) for mobile sensor network environments. Currently available studies usually suffer from unnecessary data transmission resulting from random way point approach. To address the problem, we propose a method which uses the Hilbert curve to create a path. The proposed method guarantees shorten transmission distance between the sink node and each sensor node by assigning orders of the curve according to sensor node density. Furthermore, The schedule of the sink node is informed to all of the sensing nodes so that the Duty Cycle helps the network be more energy efficient. In our experiments, the proposed method outperforms the existing works such as TTDD and CBPER by up to 80% in energy consumption.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.268-268
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• 2015

하천법 제66조에서 지자체는 하천에서 생기는 수익금을 하천의 유지 보수에 관한 비용에 사용해야 한다고 규정하고 있고, 동법 시행령 제77조에서 하천 수익금은 하천의 유지 보수를 위해 우선적으로 사용해야 한다고 규정하고 있다. 하천 수익금은 법에서 규정한바와 같이 하천관리를 위해 사용되어야 하지만 건설교통부에서 제공한 2003년도 자료를 분석한 결과 하천과 관련된 용도로 사용된 하천수익금은 30%만 사용되고 있었다. 하천 수익금은 하천의 유지 보수에 우선순위로 사용해야 함에도 불구하고 현재 지자체의 하천 관리에 소요되는 비용을 구체적으로 파악하기 어려운 실정이다. 따라서 본 연구는 지역 내 물 관리 및 재정 관리를 구축하고 있는 네덜란드의 사례를 통하여 국내 하천 유지 보수를 위한 재정확보 도입 방안을 도출하였다. 네덜란드는 지역의 55%가 해수면 아래에 위치한 저지대 국가로 기후변화의 적응을 위해 각 지역별 물 기구는 물 관리를 위한 재정확보로서 독자적인 세금시스템을 구축해왔다. 본 연구는 먼저 네덜란드의 하천관리 측면의 물 기구의 정책방향, 중점추진과제 등의 여건을 살펴봄으로써 네덜란드의 물 관리 방향을 조사하였다. 이를 통해 (1)물 관리 업무에 쓰인 네덜란드 정부 지출 내용 (2)네덜란드 물 관리 기구 법제분석 (3)네덜란드 물 관리 주관 기관 및 재정 조달 방식을 구분할 수 있었다. 또한 국내 하천 수익금 징수 체계와 네덜란드 징수체계를 비교 분석하였다. 비교분석 결과 우리나라와 달리 네덜란드 물기구의 시스템은 중앙정부와 별도로 독립적인 세금시스템을 갖춰 독자적인 하천관리유지가 가능하였다. 이는 지역별 물 기구가 세금을 토대로 물 관리를 위한 금융기관을 설립함으로써 물 관리 재정문제를 해결하고 있기 때문이다. 이는 물 관리를 위한 재원 확보를 위해 네덜란드가 지자체 중심의 물관리가 정착되는 모범적인 사례를 보여주고 있다는 점을 파악할 수 있다. 본 연구를 통하여 네덜란드의 사례를 통해 국내의 재정확보 방안을 위한 방향성을 도출하였다. 네덜란드의 사례는 물 관리의 확보를 위해 자체 금융기관을 설립하여 재원조달을 성공했다는 점에서 국내 하천의 관리 유지 재원조달에 관한 새로운 관점을 시사한다. 국내 하천의 관리유지 재원조달에 대한 논의가 지속되고 있으므로 네덜란드 사례는 향후 우리나라의 하천 관리유지를 위한 재원조달의 제도적 기반을 구축하기 위한 기초 조사로 활용되어 질 것으로 기대한다.

• Journal of Digital Convergence
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• v.17 no.3
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• pp.395-404
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• 2019

This study investigates the interactivity of smart LMS. To this end, smart LMS was used for one semester in the English course for economics majors and the surveys about its interactivity were conducted. The findings show that smart LMS enhanced the interaction between instructors and students, between students and students, and between students and learning contents. Especially in the classroom, the activity bulletin made possible the instructor's immediate feedback about team-based activity outcomes. Also, outside the classroom, Wiki made it convenient for students to collaborate with each other. In addition, activity outcomes in the activity bulletin and course materials uploaded on smart LMS contributed to the interactivity. However, what is recommended to do to increase the interactivity are to prepare instructional strategies for students to get used to using smart LMS and smartphones as their learning tool, to test the target systems of smart LMS in advance, and to take proper actions to solve the problems of smartphone's data and battery.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.4
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• pp.431-437
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• 2019

PLC(Power Line Communication) is being used in various ways in smart grid system because of the advantages of low cost and high data throughput. However, power line channel has many problems due to impulse noise and various studies have been conducted to solve the problem. Recently, ACDL(Adaptive Cannonical Differential Limiter) which is based on an adaptive clipping with analog nonlinear filter, has been proposed and performs better than the others. In this paper, we show that ACDL is similar to the detection of slew rate with oversampled digital signal by simplification and analysis. Through the simulation under the PRIME standard it is shown that the proposed performs equal to or better than that of ACDL, but significantly reduce the complexity to implement. The BER performance is equal but the complexity is reduced to less than 10%.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.7
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• pp.942-948
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• 2020

In this paper, we propose a clustered algorithm that possible more efficient user distinction within clustering using context-aware attribute information. In typically, the data provided to classify interrelationships within cluster information in the process of clustering data will be as a degrade factor if new or newly processing information is treated as contaminated information in comparative information. In this paper, we have developed a clustering algorithm that can extract user's recognition information to solve this problem in using K-means algorithm. The proposed algorithm analyzes the user's clustering attributed parameters from user clusters using accumulated information and clustering according to their attributes. The results of the simulation with the proposed algorithm showed that the user management system was more adaptable in terms of classifying and maintaining multiple users in clusters.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.50 no.7
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• pp.515-521
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• 2022

In this paper, we propose Quad BTC that compresses DSM files to allow random access for TRF (Terrain Referenced Flight). The terrain data used for TRF has a large data capacity to be stored in the UAV (Unmanned Aerial Vehicle), so its size must be reduced through compression. Conventional BTC (Block Truncation Coding) based compression methods are suitable for TRF because it can decode randomly accessing specific coordinates. However, These conventional methods have a problem that the error increases because the deviation of the data increases as the size of the block increases. In this paper, we propose Quad BTC method that adaptively divides a block in to 4 sub blocks and compresses to solve this problem. The proposed method may reduce errors because the size of the sub block can be adjusted within the block. Through simulation using actual terrain data, it is verified that Quad BTC has less error at the same compression ratio than conventional BTC and AM BTC.

• The Journal of the Convergence on Culture Technology
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• v.7 no.4
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• pp.291-297
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• 2021

The current formal and memorized design repetition training and practice is wandering in the uniform flat design thinking expression. To change these two-dimensional current issues into a three-dimensional design method, set the direction for each grade level under the integrated convergence educational goal and carry out projects step by step to understand design, the principle of spatial composition, the introduction of traditional design history, and the overall design of craft design. Creative and practical skills such as approach should be cultivated. Designers can only be produced through systematic education and training. In order to lead society and succeed, a designer who has experienced solutions and countermeasures on how to adapt themselves to the demands of various changes in the times must come to the field. Education experts insisted on innovation of the organizational structure and subject of the education system, and emphasized the importance of education in response to the rapid pace of change in the 21st century. This study aims to propose an educational system that combines academic research with a structural approach to tasks by setting a project that reflects the needs of society for convergence practice in which design and adjacent disciplines are linked through understanding and analysis of these issues.

• Journal of the Society of Disaster Information
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• v.17 no.4
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• pp.802-816
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• 2021

Purpose: In this paper, we propose a direction of future research and development to be carried out in the passive tracking field by deriving a white space with enhanced search formula of patent analysis. Method: In this paper, we derive a white space by identifying the direction and the flow of technology change and by matrixing the object and solution through extensive patent search with enhanced search formula and analysis in the field of passive tracking technology. Result: By the proposed scheme, 'multi-target positioning and tracking' and '3D positioning technology' using artificial intelligence, adaptive/hybrid positioning technology, and radar/antenna were derived as white space technologies and confirmed with absence of any services or products. Conclusion: The derived white space technologies from this paper are the areas where patent applications are not active and there are not many prior patents, thus it is necessary to secure the rights through more active R&D and patent application activities.

• Journal of Digital Convergence
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• v.20 no.5
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• pp.253-260
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• 2022

Creativity, one of the core competencies of the 21st century, is required as an essential item for members of society. Emphasizes its ability in terms of personality that allows it to be used in the desired direction. However, creativity is considered to contribute to positive change in the organization, not only in creating new ideas or products, but also in adapting to a changing environment and solving problems. Accordingly, by reviewing previous studies, it was concluded that rewards can promote or hinder creativity, which may vary depending on the nature of rewards, the concept of creativity possessed by the researcher, individual differences, and external environment. We also proposed that rewards may influence creativity through motivational, cognitive, and synthetic functions. Based on the analysis, a specific model was proposed for the effect of reward on creativity. This study is based on existing research and analyzed various factors and mechanisms acting in the process of influencing creativity based on comparison of which extrinsic and intrinsic motivations have what kind of relationship. Next, it appears that rewards differ from person to person according to the way they are given in environmental circumstances. Finally, by rewarding various types of creative tasks, an active reward role can be secured.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.3
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• pp.603-612
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• 2010

Recently, with the advance of computing and networking technique, the high speed internet becomes widespread, however, it is still hard job to do streaming the media which requires high network bandwidth over the internet. Previous VoD system researches for streaming over the internet mainly proposed techniques that controls the QoS(Quality of Service) of the media in proportion to the network status. Though, this could be the solution for the service provider while the service user who wants constant QoS may not satisfy with variable QoS. In the paper, we propose greedy precedent frame transmission technique, GPFT, for guarantee of constant QoS. In GPFT, Streaming VoD server prefetches precedent frames and transmits the frame greedily by increasing the frame transmission rate while the available network bandwidth is high. The GPFT uses the prefetched precedent frames to guarantee the QoS while the available network bandwidth is low. The experiment result shows that the proposed GPFT could guarantee the constant QoS by prefetching the frames adaptively to the network bandwidth with the characteristic of video stream.