• ETRI Journal
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• v.30 no.1
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• pp.164-166
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• 2008

This paper proposes a priority-based duplicate burst transmission mechanism in an optical burst switching network to enhance the probability of successful reception of bursts. The performance of the proposed mechanism is evaluated by NS2 simulations. Our results show that the burst loss rate is improved especially under light traffic loads.

• ETRI Journal
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• v.10 no.4
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• pp.89-98
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• 1988

We consider an N duplicate-server system, where each server consists of two reconfigurable duplicated units which are subject to breakdowns. This system is studied analytically using generating functions, and also numerically using the matrix-geometric procedure. Using the generating function approach we obtain a recursive expression of the queuelength distribution for N=1. This expression in difficult to generalize to N>1. The numerical method is applicable for any value of N. For any N, we also obtain the condition for stability and the availability of the system.

• Applied Microscopy
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• v.46 no.2
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• pp.67-70
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• 2016

Research ethics are mainly of two fields; research integrity and publication ethics. Research misconducts can occur at both areas. Examples of the research integrity violations are falsification, fabrication, and plagiarism; and those of the publication ethics violations are duplicate publication including self-plagiarism, and improper authorship. In this paper, concepts of research misconducts defined in Research Misconduct-related Rules of The Korean Society of Microscopy are explained and discussed.

• Health Policy and Management
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• v.33 no.3
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• pp.241-242
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• 2023

As part of efforts to internally strengthen the research ethics capacity of the Korean Academy of Health Policy and Management, we have compiled research ethics issues that are frequently encountered in public health researches. Firstly, when reusing research reports or dissertations as papers, efforts should be made to avoid unfair duplicate publication. Compliance with the institutional review board exemption process is required, and additional efforts should be devoted during the text recycling process to prevent self-plagiarism or unjust duplicate publication.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• fall
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• pp.152-153
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• 2021

고성능 딥러닝 모델은 학습과 추론 과정에서 고비용의 전산 자원과 많은 연산량을 필요로 하여 이에 따른 개발 환경과 많은 학습 시간을 필요로 하여 개발 지연과 한계가 발생한다. 따라서 HW 또는 SW 개선을 통해 파라미터 수, 학습 시간, 추론시간, 요구 메모리를 줄이는 연구가 지속 되어 왔다. 본 논문은 EfficientNet에서 사용된 Linear Bottleneck을 변경하여 정확도는 소폭 감소 하지만 기존 모델의 파라미터를 55%로 줄이는 경량화 모델을 제안한다.

• Journal of KIISE:Databases
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• v.37 no.1
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• pp.50-55
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• 2010

Duplicate documents in blog service system are one of causes that deteriorate both of the quality and the performance of blog searches. Unlike the WWW environment, the creation of documents is reported every time in blog service system, which makes it possible to identify the original document from its duplicate documents. Based on this observation, this paper proposes a novel method for detecting duplication documents in blog service system. This method determines whether a document is original or not at the time it is stored in the blog service system. As a result, it solves the problem of duplicate documents retrieved in the search result by keeping those documents from being stored in the index for the blog search engine. This paper also proposes three indexing methods that preserve an accuracy of previous work, Min-hashing. We show most effective indexing method via extensive experiments using real-life blog data.

• Journal of Satellite, Information and Communications
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• v.10 no.3
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• pp.53-56
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• 2015

In this paper, we want provide improved services with faster transmission, IEEE 802.11n was standardized. A-MPDU (Aggregation MAC Protocol Data UNIT) is a vital function of the IEEE 802.11n standard, which was proposed to improve transmission rate by reducing frame transmission overhead. In this paper, we show the problems of TCP retransmission with A-MPDU and propose a solution utilizing the property of TCP cumulative ACK. If the transmission of an MPDU subframe fails, A-MPDU mechanism allows selective re-transmission of failed MPDU subframe in the MAC layer. In TCP traffic transmission, however, a failed MPDU transmission causes TCP Duplicate ACK, which causes unnecessary TCP re-transmission. Furthermore, congestion control of TCP causes reduction in throughput. By supressing unnecessary duplicate ACKs the proposed mechanism reduces the overhead in transmitting redundant TCP ACKs, and transmitting only a HS-ACK with the highest sequence number. By using the RACK mechanism, through the simulation results, it was conrmed that the RACK mechanism increases up to 20% compared the conventional A-MPDU, at the same time, it tightly assures the fairness among TCP flows.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.6
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• pp.151-156
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• 2020

Various institutions provide various welfare-related services, and accordingly, the quantity and quality of welfare-related services are improved. Along with the improvement of welfare services, the rate of fraudulent and redundant supply and demand due to inappropriate applicants is also increasing. In particular, in the case of similarly promoted projects by various institutions, confirmation of duplicate applications may be insufficient due to system inconsistency between institutions and delays in qualification verification, which may result in duplicate supply and demand. In this paper, in order to prevent the redundant supply and demand related to welfare service similar projects in various institutions, the problem of data management and sharing between institutions was reviewed and a method of applying blockchain technology was proposed step by step. Through the proposal of this paper, transparent data management of recipients is possible, and through this, trust-based welfare benefit management will be possible.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.27 no.4
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• pp.981-987
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• 2017

Proliferation of cloud computing services brings about reduction of the maintenance and management costs by allowing data to be outsourced to a dedicated third-party remote storage. At the same time, the majority of storage service providers have adopted a data deduplication technique for efficient utilization of storage resources. When a hash tree is employed for duplicate identification as part of deduplication process, size information of the attested data and partial information about the tree can be deduced from eavesdropping. To mitigate such side channels, in this paper, a new duplicate identification method is presented by exploiting a multi-set hash function.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.67 no.10
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• pp.1358-1363
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• 2018

As the usage of the Internet grows and digital media become more diversified, it has become much easier for digital contents to be distributed and shared. This makes easier to access the desired digital contents. On the other hand, there is an increasing need to protect the copyright of digital works. There are some prevalent ways to protect ownership, but they accompany several disadvantages. Among those ways, watermarking methods have the advantage of ensuring invisibility, but they also have a disadvantage that they are vulnerable to external attacks such as a noise and signal processing. In this paper, we propose the detecting method of illegal contents that is robust against external attacks to protect digital works. We extract HSV and LBP features from images and use Euclidian-based hashing techniques to shorten the searching time on high-dimensional and near-duplicate videos. According to the results, the proposed method showed higher detection rates than that of the Watermarking techniques in terms of the images with fabrications or deformations.