• 한국인터넷방송통신학회논문지
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• 제20권6호
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• pp.151-156
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• 2020

최근 복지서비스의 확대에 힘입어 여러 정부기관에서 복지 관련 서비스를 다양하게 제공하고 있으며 이에 따라 복지관련 서비스의 양과 질의 향상이 동시에 이루어지고 있다. 복지서비스 향상과 더불어 부적정 신청자로 인한 부정·중복수급율도 증가하고 있다. 특히 여러 기관에서 유사하게 추진되는 사업의 경우 기관들 간 시스템 불일치 및 자격검증 지연의 문제 등에 기인한 중복신청 확인이 미흡할 수 있으며 이로 인한 중복수급이 발생할 수 있다. 본 논문에서는 여러기관에서 진행되는 복지서비스 유사사업 관련 중복수급 방지를 위하여, 기관 간 데이터 관리 및 공유의 문제점을 검토하고 블록체인기술의 적용방법을 단계별로 제안하였다. 본 논문의 제안을 통하여 수급대상자의 투명한 데이터 관리가 가능하며 이를 통하여 신뢰기반의 복지급여 관리가 가능할 것이다.

• 사물인터넷융복합논문지
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• 제10권2호
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• pp.109-114
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• 2024

높은 데이터 신뢰성을 요구하는 엔터프라이즈 저장시스템은 데이터 손실 및 장애 시 복구를 위해 RAID(Redundant Array of Independent Disks) 시스템을 적용하고 있다. 특히 RAID 5는 패리티를 여러 저장장치에 분산 저장하여 공간 효율성과 안정성을 보장하였다. 그러나 저장장치의 용량이 서로 다를 경우 가장 작은 용량의 저장장치기준으로 RAID가 구축되어 저장공간의 낭비가 발생한다. 따라서 이러한 자원관리 문제를 해결하기 위한 연구가 필요하다. 본 논문에서는 SSD(Solid State Disk)로 구성된 RAID에서 각각의 독립적인 NAND 플래시 메모리 블록을 내부뿐만 아니라 외부 SSD와 RAID 그룹을 묶는 방법을 제안한다. 이 방법은 SSD 내부의 블록 정보를 RAID 시스템에 전달하는 정책과 RAID 시스템으로부터 전달된 물리적인 주소를 RAID 그룹으로 묶는 정책으로 구분된다. 이 방법을 통해 서로 다른 용량의 SSD를 RAID로 묶을 때 자원의 낭비가 발생하지 않는 RAID를 유지할 수 있다. 마지막으로 실험을 통해 제안하는 방법의 효과를 증명한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권6호
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• pp.3238-3257
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• 2019

Closed-circuit television (CCTV) technology continuously captures and stores video streams. Users are typically required by policy to store all the captured video for a certain period. Accordingly, increasing the number of CCTV operation cycles and photographing positions expands the amount of data to be stored. However, expanding the available storage space for video data incurs increased costs. In recent years, this problem has been addressed with cloud storage solutions, which enable multiple users and devices to access and store data simultaneously. However, because of the large amount of data to be stored, a vast storage space is required. Consequently, cloud storage administrators need a way to store data more efficiently. To save storage space, deduplication technology has been proposed to prevent duplicate storage of the same data. However, because cloud storage is hosted on remote servers, data encryption technology must be applied to address data exposure issues. Although deduplication techniques for encrypted data have been studied, there have been various security vulnerabilities. We attempted to solve this problem by addressing various issues such as poison attacks, property forgery, and ownership management while removing the redundant data and handling the data more securely.

• 정보과학회 논문지
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• 제44권10호
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• pp.1112-1123
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• 2017

최근 다수의 콘텐츠 서비스 제공자가 제공하는 콘텐츠 중심 서비스가 클라우드로 이전함과 동시에 온라인 상의 유사 중복 콘텐츠가 급격히 증가함에 따라, 불필요한 과잉 검색 결과를 초래하는 등 클라우드 기반 데이터 검색 서비스의 품질이 저하하고 있다. 또한 데이터 보호법 등에 의거, 각 서비스 제공자는 서로 다른 비밀키를 이용하여 콘텐츠를 암호화하기 때문에 데이터 검색이 어렵다. 따라서, 검색 프라이버시를 보장하면서 유사 중복 데이터 검색의 정확도까지 보장하는 서비스의 구현은 기술적으로 어려운 실정이다. 본 연구에서는, 클라우드 환경에서 데이터 복호 없이 불필요한 검색 결과를 제거함으로써 검색서비스 품질을 제고하며, 동시에 효율성까지 개선된 유사 중복 검출 기법을 제안한다. 제안 기법은 검색 프라이버시와 콘텐츠 기밀성을 보장한다. 또한, 사용자 측면의 연산 비용 및 통신 절감을 제공하며, 빠른 검색 평가기능을 제공함으로써 유사 중복 검출 결과의 신뢰성을 보장한다. 실제 데이터를 통한 실험을 통해, 제안 기법은 기존 연구 대비 약 70.6%로 성능이 개선됨을 보인다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.770-773
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• 2005

In most biological laboratory, sequences from sequence machine are stored into file disks as simple files. It will be hard work to store and manage the sequence data with consistency and integrity such as storing redundant files. It is required needed to develop a system which integrated and managed genome data with consistency and integrity for accurate sequence analysis. There fore, in this paper, we not only store gene and protein sequence data through sequencing but also manage them. We also make a integrate schema for transforming the file formats and design database system using it. As integrated schema is designed as a BSML, it is possible to apply a style language of XSL. From this, we can transfer among heterogeneous sequence formats.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.94-99
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• 1993

In this paper, the method for navigation and obstacle avoidance of an autonomous mobile robot is proposed. It is based on the fuzzy inference system which enables to deal with imprecise and uncertain information, and on the neural network which enables to learn input and output pattern data obtained from ultrasonic sensors. For autonomous navigation, the wall-following navigation utilizing input and output data by an expert's control action is constructed. An approach by the neural network is developed for the obstacle avoidance because of the redundant input data. For an autonomous navigation, the fuzzy control and the control of the neural network are integrated and its feasibility is demonstrated by means of experiment.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1466-1472
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• 2007

State estimation is to estimate the values of the states that minimize the error between the real states and the measured states, which are usually hampered by noise. It exploits the redundant data and the equality constraints achieved from the power systems. In the electric railway feeding systems, especially, the measured states may have significant level of noise in comparison with the commercial power systems. Since the meters - the sources of the data that include vehicles - are distributed in the long distance along the railroad, they are vulnerable to the signal interference. In this paper we have studied the application of state estimation method to the AT feeding systems and shown that this method can increase the reliability of the measured data.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(5)
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• pp.211-214
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• 2002

Under a continuous manufacturing process, two dimension inspection system causes problems as blurring effect and low resolution and requires position calibration between frames. One dimension inspection system is, therefore, being researched as a substitution. In this paper, we implement mechanism of switching memory and processing data for reasonable one dimension inspection system. Redundant weft image and noise was suggested to be reduced by new method using modified morphological process and masked erosion process. From resulting image, line data and possible error information were obtained and constructed as a structure. Finally, error detecting algorithm was performed with this data structure. Processing time of error detecting was 0.625ms per line in applied system and experiment showed 94.7% of error detecting ability. This method is 20% faster in speed and 2.7% higher in error detecting ability comparing with the present method.

• 유통과학연구
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• 제10권5호
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• pp.19-28
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• 2012

The study examines the performance and its relationship with capital structure and agency cost with respect to the industrial configurations and economic groups of Pakistan Economy. The study employs data set of 334 listed joint stock companies from the nonfinancial sectors for the period of 1999-2009 from cotton and textile, engineering, chemical, sugar, cement, fuel and energy, paper and board, transport and communication, and miscellaneous economic groups. Pooled data from the Panel data methodology has been applied to observe the significance of different performance measures through determinant of capital structure and agency costs with special focus on the leverage and cash flows as the direct determinant and interactive variables. The empirical test results using redundant variable tests demonstrate support for agency theory in the context of Pakistan's industrial configurations. The implications of the study point towards more investigations on the subject using industrial configurations as control and moderating variables.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 통신소사이어티 추계학술대회논문집
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• pp.281-284
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• 2003

Multi-code CDMA is an appropriate scheme for transmitting high rate data. However, dynamic range of the signal is large, and power amplifier with good linearity is required. Code select CDMA (CS/CDMA) is a variation of multi-code CDMA scheme that ensures constant amplitude transmission. In CS/CDMA input data selects multiple orthogonal codes, and sum of these selected codes are MPSK modulated to convert multi-level symbol into different carrier phases. CS/CDMA system employs level clipping to limit the number of levels at the output symbol to avoid hish density of signal constellation. In our previous work we showed that by encoding input data of CS/CDMA amplitude of the output symbol can be made constant. With this coding scheme, level clipping is not necessary and the output signal can be BPSK modulated for transmission. In this paper we show that the constant amplitude coded(CA-) CS/CDMA transmitter can be implemented using only logic gates, and the hardware complexity is very low. In the proposed transmitter architecture there is no apparent redundant encoder block which plays a major role in the constant amplitude coded CS/CDMA.