• 한국지형공간정보학회:학술대회논문집
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• 한국지형공간정보학회 2003년도 창립 10주년 기념 국제학술대회 논문집
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• pp.89-94
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• 2003

이동통신기술의 발전과 무선인터넷 사용자의 급증 및 휴대 단말기 장치의 성능 향상으로 인하여 사용자의 위치 정보를 활용하여 부가 정보 서비스를 받을 수 있는 위치기반서비스(LBS : Location Based Service)에 대한 관심이 급증하고 있다. 위치기반 서비스를 제공하기 위해서는 사용자의 위치정보를 관리하는 이동객체 관리 기술이 필수적으로 요구된다. 이에 본 논문에서는 기존의 시공간데이터베이스시스템 연구와 이동객체 관리 시스템을 간략히 살펴보고, 이동객체 객체 관리 시스템 중 이동객체를 저장하는 서브시스템을 설계 및 구현하고자 한다. 이를 위해서 단일 RDBMS 기반에 위치정보를 저장, 검색하는 컴포넌트와 수많은 이동객체의 계속적인 저장 및 검색의 과부하를 조절하고 대용량의 위치정보를 효율적으로 관리하기 위해 분산 데이터베이스에 저장하는 컴포넌트를 제안하고자 한다.

• Journal of information and communication convergence engineering
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• 제11권1호
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• pp.17-23
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• 2013

Cloud computing is a currently developing revolution in information technology that is disturbing the way that individuals and corporate entities operate while enabling new distributed services that have not existed before. At the foundation of cloud computing is the broader concept of converged infrastructure and shared services. Security is often said to be a major concern of users considering migration to cloud computing. This article examines some of these security concerns and surveys recent research efforts in cryptography to provide new technical mechanisms suitable for the new scenarios of cloud computing. We consider techniques such as homomorphic encryption, searchable encryption, proofs of storage, and proofs of location. These techniques allow cloud computing users to benefit from cloud server processing capabilities while keeping their data encrypted; and to check independently the integrity and location of their data. Overall we are interested in how users may be able to maintain and verify their own security without having to rely on the trust of the cloud provider.

• 디지털산업정보학회논문지
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• 제17권2호
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• pp.1-11
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• 2021

Salt and pepper is a type of impulse noise. It may appear due to an error in the image transmission process and image storage memory. This noise changes the pixel value at any position in the image to 0 (in case of pepper noise) or 255 (in case of salt noise). In this paper, we present an algorithm for SAP noise reduction. The proposed method consists of three steps. In the first step, the location of the SAP noise is detected, and in the second step, the pixel value of the detected location is restored using a weighted average of the surrounding pixel values. In the last step, a reliability matrix around the reconstructed pixels is constructed, and additional correction is performed with a weighted average using this. As a result of the experiment, the proposed method appears to have similar or higher objective and subjective image quality than previous methods for almost all SAP noise ratios.

• 반도체디스플레이기술학회지
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• 제22권3호
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• pp.125-129
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• 2023

In this paper, we propose a method to design and implement a smart pipeline information management system that can provide visualization information linked to GIS and roadmap based on the construction of precise pipeline buried information. The smart pipeline information management system consists of a positioning device for high-precision pipeline location measurement and surround view image data recording, a database for data storage and management, and a mobile app for remote monitoring and management. It connects surrounding image data and location data with GIS and roadmap. Convenience and accessibility of management can be improved.

• 대한전자공학회논문지SD
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• 제41권2호
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• pp.17-25
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• 2004

디지털 흘로그래픽 정보 저장을 위한 새로운 데이터 매트릭스 구조와 이 구조를 통해 정보 추출할 수 있는 알고리즘을 제안하고 구현하였다 제안된 데이터 매트릭스 구조는 실제 사용자 정보와 기하학적 변형에 따른 raw BER을 줄이기 위한 참조 격자로 이루어져있고, 정보를 추출하는 알고리즘은 찬조격자의 위치를 판별하고 이 정보로부터 실제 사용자 정보를 추출하는 구조로되어 있다. 실험 결과 영상 이동, 회전, 배율변화에 대해 각각 3.09×10-18, 6.14×10-12, 1.2×10-7 의 평균 raw BER을 얻음으로서, 기하학적 변형에 대한 우수한 검출특성을 갖고 있음이 증명되었다.

• 대한전자공학회논문지
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• 제22권1호
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• pp.7-13
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• 1985

쉽게 시험할 수 특성을 가진 SLA 의 설계에 관해 논하였다. 제안된 SLA는 hardware를 부가함으로써 회로의 상태를 쉽게 조절하고 점검할 수 있게 하였다. 제안된 SLA는 test pattern과 응답이 SLA에 구현된 함수에 관계없고 단지 SLA의 크기에 따라 유일하게 결정되는 매우 짧은 보편적인 test sequence를 갖는다. 여기서 고려된 SLA의 고장은 단일 및 다중 stuck faults, crosspoint faults 및 bridge faults이다. 또한 고장의 위치 판별 및 그 처리에 관해서도 고찰하였다.

• Journal of Electrical Engineering and Technology
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• 제12권2호
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• pp.569-575
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• 2017

This paper proposes a method to utilize an energy storage system (ESS) based on the assessment of an area of severity (AOS) to voltage sag. The AOS is defined as a set of the fault positions that can cause voltage sags at many buses simultaneously. The assessment of AOS helps to determine an optimal location of ESS installation to minimize the expected sag frequency (ESF) at concerned buses. The ESS has the ability not only to play traditionally known roles but also to mitigate voltage sag impact on renewable energy sources (RES) in the islanded microgrid. Accordingly, using the proposed method the ESS has additional features to prevent the operation failure of RESs and improve the stability of the microgrid. In order to verify the presented method, a case study was conducted on the sample microgrid system that is modified from an IEEE 57-bus system.

• 조명전기설비학회논문지
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• 제28권8호
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• pp.106-112
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• 2014

This paper presents the analysis of connected operation of photo voltaic source and Li energy storage system. The micro-grid has been installed and operated for several years at the campus of USF and has been a role of test bed. Photo voltaic source has been strongly influenced by the location, weather and climate of a installed area and Li battery is connected directly to the photo voltaic source to compensate for the limitations. The Li battery is operated to supply power output to the grid by the charging or discharging mode based on the average power output of the PV source which is calculated from monitored data for several years. The load of the PV and Li battery system is operated as a severe loading condition and the operating characteristics of PV source and Li battery are analyzed in detail. In connected operations of PV and Li battery to power system, the PV and Li battery is operated to supply constant power during only day time or peak time to increase load shedding ratio and efficient usage of generation sources in power system.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2008년도 춘계학술발표대회 논문집
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• pp.339-344
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• 2008

The purpose of this study was to find out the residents' perceptive opinions of apartment housing environment and to contribute to develop a apartment unit plan in Daejeon City. This research was performed by a questionnaire survey method, 464 data was collected from apartment residents lived in about $85m^2$ unit with 3 rooms and the apartments was limited to the complexes within 3 years at Yuseong-gu and Seo-gu. By analyzing those data, findings are as follows: 1) Residents thought living room, kitchen and bathroom were importment space in a unit plan. They needed a storage function in an entrance and a intermediate room, and Anbang(materbed room) so did. L-DK plan type was very preferred. 2) Sub-kitchen was needed for a refrigerator of Kinch, the location of it was realted to a main kitchen and a uitility. the third room was needed for library, home office and storage space. 3) The enlargment remodeling of balcony was showed livingroom balcony or personal bedrooms at the time of occupancy. They needed the balcony near a kitchen or an utility to equip a storage facility. And residents were preferred to their taste rather than a choice of interior concept package services.

• 한국식품저장유통학회:학술대회논문집
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• 한국식품저장유통학회 2003년도 제23차 추계총회 및 국제학술심포지움
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• pp.26-32
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• 2003

Rice is one of the most important cereals in the world. Japanese people use about 9 million tons of rice per you. We use rice for cooked rice as staple foods and for processing, such as rice wine (sake), rice crackers and miso fermentation, etc. Palatability, eating quality, of rice is evaluated by the sensory test and various kinds of physicochemical measurements. Japanese National Food Agency started the storage of 1.5 million tones of rice in 1996. We carried out the storage test using high quality rices since 1995 until 1996. As indices for the quality deteriorations of rice grains during the storage, germination ratio, enzyme activities, fat acidity, physical properties of cooked rice were clarified to be useful. We applied colorimetric method for the measurements of fat acidities in the place of titration method. Processing suitabilities of rice differ depending on the products. Low amylose rice is more suitable for soft rice crackers and high amylose rice is preferred more for rice noodle. Pre-cooked rice products, such as frozen cooked rice, retort-pouched rice and aseptic rice, are increasing recently in Japan. In addition to above-mentioned physico-chemical tests, NIR spectroscopy,“Midometer”and“Taste sensor”are novel and useful to evaluate eating quality and processing suitabolities. Recently, rice wholesalers and retailers have been obligated to display the name of cultivar, location of cultivation and the year of production of rice grains which they sell by the Japanese Agricultural Standard Law (JAS). In order to detect the dishonest labeling of rice cultivars, we developed new cultivar identification method based on DNA polymorphism.