• Proceedings of the Korean Society of Computer Information Conference
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• 2024.01a
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• pp.141-144
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• 2024

이 논문은 현대의 불규칙한 기후 환경에 주요한 영향을 미치는 탄소 배출을 감소시키기 위한 현실적인 방안을제공하고자 한다. 우산 대여시스템은 일회용 우산구매 시 사용 절제를 장려할 수 있는 시스템으로, 사용 시 지속해서 탄소 배출을 감소시킬 수 있다. 사용자는 자신이 위치한 곳에 가까운 대여소를 애플리케이션으로 선택 후 대여가 가능하며 대여한 곳과 다른 대여소에도 반납할 수 있다. 지난 몇 년간 시행됐던 아날로그식에 단점인 회수율을 시민의식이라는 신념에만 의존하지 않고 NFC 보안과 Node MCU 통신 탑재를 통해 효율적으로 다양한 상업이나 공공기관에서 확장될 수 있을 것으로 기대한다.

• Journal of Digital Contents Society
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• v.14 no.4
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• pp.493-503
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• 2013

Through everyday life to an art work creation, the computer technology is using intimately and infiltrated deeply in the digital era. Particularly dissemination and miniaturization of the computer cause remarkable development of computer and mobile game industry. Its popularity in general is reaching to the art field. This study contemplate the aesthetic changes and characteristics in game and dance convergence investigating the concept of art game and dance game as a new art form.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.05a
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• pp.528-530
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• 2022

심층강화학습에 완전 연결 신경망과 합성곱 신경망은 잘 활용되는 것에 반해 순환 신경망은 잘 활용되지 않는다. 이는 강화학습이 마르코프 속성을 전제로 하기 때문이다. 지금까지의 강화학습은 환경이 마르코프 속성을 만족하도록 사전 작업이 필요했다, 본 논문에서는 마르코프 속성을 따르지 않는 환경에서 이러한 사전 작업 없이도 순환 신경망의 은닉 상태를 통해 마르코프 속성을 학습함으로써 학습 성능을 개선할 수 있다는 것을 소개한다.

• Bulletin of the Korean Mathematical Society
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• v.52 no.3
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• pp.825-836
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• 2015

In this article, we discuss the complete moment convergence for arrays of B-valued random variables. We obtain some new results which improve the corresponding ones of Sung and Volodin [17].

• Journal of applied mathematics & informatics
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• v.19 no.1_2
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• pp.165-177
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• 2005

In this paper, an adaptive trust region method based on the conic model for unconstrained optimization problems is proposed and analyzed. We establish the global and super linear convergence results of the method. Numerical tests are reported that confirm the efficiency of the new method.

• The Journal of the Korea Contents Association
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• v.3 no.4
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• pp.103-110
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• 2003

In this paper, we investigate the properties of fuzzy spheres and estabilish convergence theorems of them. We expect that convergence theorems of fuzzy spheres may be useful for computer graphics and patten recognition.

• ETRI Journal
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• v.26 no.5
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• pp.505-508
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• 2004

We propose a new arbitration method for an input buffered switch with a buffered crossbar. In the proposed method, an exhaustive polling method is used to decrease the synchronization. Using an approximate analysis, we explain how the proposed method improves the switch performance. Also, using computer simulations, we show the proposed method outperforms the previous methods under burst traffic.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.01a
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• pp.285-286
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• 2022

본 연구는 주문을 하여 배달을 하기 까지 필요한 플랫폼들을 통합하여 더 나은 서비스를 지원하는 시스템이다. 주문이 가능한 주문 어플리케이션, 주문 관리 및 배달 대행 관리가 가능한 포스프로그램, 배달 대행 기사 사용하는 배달 대행 어플리케이션을 설계하였다. 주문 앱을 이용하는 소비자의 입장에서는 합리적인 가격을, 음식 업체 업주의 입장에서는 주문 어플리케이션 플랫폼 이용비 절감하는 효과를 제공한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.12
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• pp.6152-6168
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• 2017

Recently, the biometric-based authentication systems such as FIDO (Fast Identity Online) are increased in mobile computing environments. The biometric-based authentication systems are performed on the mobile devices with the battery, the improving energy efficiency is important issue. In the case, the size of images (i.e., face, fingerprint, iris, and etc.) affects both recognition accuracy and energy consumption, and hence the tradeoff analysis between the both recognition accuracy and energy consumption is necessary. In this paper, we propose an energy-efficient way to authenticate based on biometric information with tradeoff analysis between the both recognition accuracy and energy consumption in multimedia IoT (Internet of Things) transmission environments. We select the facial information among biometric information, and especially consider the multicore-based mobile devices. Based on our experimental results, we prove that the proposed approach can enhance the energy efficiency of GABOR+LBP+GRAY VALUE, GABOR+LBP, GABOR, and LBP by factors of 6.8, 3.6, 3.6, and 2.4 over the baseline, respectively, while satisfying user's face recognition accuracy.

• The Transactions of the Korean Institute of Power Electronics
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• v.27 no.5
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• pp.367-375
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• 2022

Generally, a proportional-resonant controller is used to eliminate steady-state errors during the voltage-current control of a double-conversion uninterruptible power supply (UPS) in a stationary reference frame. Additionally, the feed-forward control compensating for the load current, which can be considered a disturbance of the voltage controller, can be used to improve the disturbance rejection performance. However, during the parallel operation of UPSs, circulating current can occur between UPS modules when performing both feed-forward control and droop control because feed-forward control reduces the circulating current impedance. This study proposes a feed-forward compensation technique that considers the impedance of circulating current. An additional feed-forward compensation technique is developed to enhance the disturbance rejection performance. The validity of the proposed feed-forward compensation technique is verified by the experiment results of the parallel operation of a 500 W double-conversion UPS module.