• Journal of Korea Society of Digital Industry and Information Management
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• v.18 no.3
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• pp.25-32
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• 2022

DID(Decentralized Identity Identification) is a system in which users voluntarily manage their identity, etc., and control the scope and subject of submission of identity information based on a block chain. In the era of the 4th industrial revolution, where the importance of protecting personal information is increasing day by day, DID will surely be positioned as the industrial center of the Internet and e-business. However, when managing personal information, DID is highly likely to cause a large amount of personal information leakage due to electronic infringement, such as hacking and invasion of privacy caused by the concentration of user's identity information on global service users. Therefore, there are a number of challenges to be solved before DID settles into a stable standardization. Therefore, in this paper, we try to examine what problems exist in order to positively apply the development of DID technology, and analyze the improvement plan to become a stable service in the future.

• Journal of Korea Society of Digital Industry and Information Management
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• v.19 no.3
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• pp.233-244
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• 2023

Although artificial intelligence and machine learning technologies have been used in various fields, problems with personal information protection have arisen based on centralized data collection and processing. Federated learning has been proposed to solve this problem. Federated learning is a process in which clients who own data in a distributed data environment learn a model using their own data and collectively create an artificial intelligence model by centrally collecting learning results. Unlike the centralized method, Federated learning has the advantage of not having to send the client's data to the central server. In this paper, we quantitatively present the performance improvement when federated learning is applied using the building change detection learning data. As a result, it has been confirmed that the performance when federated learning was applied was about 29% higher on average than the performance when it was not applied. As a future work, we plan to propose a method that can effectively reduce the number of federated learning rounds to improve the convergence time of federated learning.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.549-550
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• 2023

본 논문에서는 데이터 마이닝을 활용한 감성적 여행계획 제공 앱으로 각 개인에게 알맞은 맞춤형 여행계획 추천 어플을 연구하고자 한다. 여행 계획에서 여행자들이 더 좋은 경험을 하도록 돕고 앱을 통하여 여행을 최대로 즐길 수 있으며 앱에서 제공하는 데이터들을 바탕으로 숙소, 관광명소, 음식점 등의 자료제공으로 최상, 최적의 숙소 체험, 훌륭한 음식점 예약, 주변의 좋은 여행지를 검색 가능하게 하고자 한다. 아울러, 어떤 여행을 계획하든 제공하는 앱으로 간편하게 감성적으로 여행을 계획하고 그 체험과 정보들을 다른 사람들에게도 여행 가이드로 추천, 공유할 수 있도록 하고자 한다.

• Journal of Digital Convergence
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• v.17 no.7
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• pp.131-138
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• 2019

The world's electricity production ratio is 40% for coal, 20% for natural gas, 16% for hydroelectric power, 15% for nuclear power and 6% for petroleum. Fossil fuels also cause serious problems in terms of price and supply because of the high concentration of resources on the earth. Solar energy is attracting attention as a next-generation eco-friendly energy that will replace fossil fuels with these problems. In this study, we test the charge-operation plan and the discharge operation plan for peak-cut operation by applying the maximum power demand reduction simulation. To do this, we selected the electricity usage from November to February, which has the largest amount of power usage, and applied charge / discharge logic. Simulation results show that the contract power decreases as the peak demand power after the ESS Peak-cut service is reduced to 50% of the peak-target power. As a result, the contract power reduction can reduce the basic power value of the customer and not only the economic superiority can be expected, but also contribute to the improvement of the electric quality and stabilization of the power supply system.

• Journal of The Korean Astronomical Society
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• v.38 no.2
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• pp.103-106
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• 2005

The Submillimeter Array (SMA), a collaborative project of the Smithsonian Astrophysical Observatory (SAO) and the Academia Sinica Institute of Astronomy & Astrophysics (ASIAA), has begun operation on Mauna Kea in Hawaii. A total of eight 6-m radio telescopes comprise the array with currently working receiver bands at 230, 345, and 690 GHz. The array will have 8 receiver bands covering the frequency range of 180-900 GHz. The backend is flexible analog-digital correlator with a full bandwidth of 2GHz, which is very powerful to cover several line emissions simultaneously. The current status and future plans of the SMA are described with emphasis on Taiwanese efforts.

• 한국정보교육학회:학술대회논문집
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• 2010.01a
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• pp.133-139
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• 2010

우리나라는 범국가적인 정보화를 추진하여 지금 어느 국가보다도 발전된 정보기술력을 가지고 있다. 이에 따라 장애인들에게도 그에 적절한 정보화교육이 이루어져야하지만 실정은 그렇지 못하고 있다. 먼저 정보화 사회의 개념과 그에 대한 긍정적, 부정적 입장에 대해 알아보고 정보격차에 대한 기본 개념을 정리한 후 장애인들을 위해 정보 격차를 줄일 수 있는 방안을 정보 접근성에서의 방법과 장애인 정보화 교육, 컨텐츠 개발 등의 관점에서 제시하였다.

• ETRI Journal
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• v.25 no.4
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• pp.211-218
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• 2003

This paper presents a dynamic resource allocation algorithm with multi-frequency time-division multiple access for the return link of interactive satellite multimedia networks such as digital video broadcasting return channel via satellite systems. The proposed timeslot assignment algorithm, called the very efficient dynamic timeslot assignment (VEDTA) algorithm, gives an optimal assignment plan within a very short period. The optimality and computational efficiency of this algorithm demonstrate that it will be useful in field applications.

• 한국디지털정책학회:학술대회논문집
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• 2003.12a
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• pp.171-185
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• 2003

This study deals with an tourism information promotion plan that the government, businesses, and private sectors should consider implementing. Tourism information policy is crucial to tourism industry competitiveness by triggering changes in economy, culture, and society. Better tourism information policy should satisfy the tourist needs as well as create additional value for the tourism businesses.

• Proceedings of the IEEK Conference
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• 2001.06e
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• pp.161-164
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• 2001

In this paper, we has been studied self controlled mobile robot system with CCD camera. This system consists of TMS320F240 digital signal processor, step motor, RF module and CCD camera. we used wireless RF module for movable command transmitging between robot and host PC. This robot go straight until 95 percent filled screen from input image. And the robot recognizes obstacle about 95 percent filled something, so it could avoid the obstacle and conclude new path plan.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 1995.11a
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• pp.112-117
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• 1995

The Nautical Chart Division has the responsibility of producing charts covering the Korean Waters and its adjacent seas. In November 1994 a part of computer charting system has been introduced to the OHA and the total system of 4 workstations and 3 graphic terminals for digital compilation and ENC preparation will be delivered by the end of this year. Using this system three papaer charts are now edited as a test-base.