• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.41 no.4
• /
• pp.433-440
• /
• 2016

This paper proposes a method of minimizing total energy consumption of IoT environment when communication devices in the network share the information directly. The proposed method reduces total number of transmission for the information sharing by using an effective network coding-based technique which dynamically selects a node and a data packet for each transmission. Simulation results show that the proposed method has better performance than an existing network coding-based method selecting transmission node in fixed order, a network coding-based method selecting transmission node in random order, and a uncoded method selecting transmission node in random order.

• Proceedings of the Korean Institute of Communication Sciences Conference
• /
• 1995.10a
• /
• pp.653-656
• /
• 1995

• The Transactions of the Korean Institute of Power Electronics
• /
• v.7 no.2
• /
• pp.194-204
• /
• 2002

In this paper, a new two-phase space vector RPWM(Random PWM) is proposed. In the proposed RPWM, each of two-phase PWM pulses is located randomly in each switching interval. Based on the space vector modulation technique, the duty ratio of the pulses is calculated. Along with the randomization of the PWM pulses, we can obtain the effects of spread spectra of inverter output voltage, d.c link current and audible switching acoustic noise as in the case of randomly changed switching frequency. To verily the validity of the proposed two-phase RPWM scheme, the experiment based on the Cl67 micro-controller was executed. The performance of the proposed scheme was compared with traditional PWM schemes experimentally.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
• /
• 1997.11a
• /
• pp.101-110
• /
• 1997

본고에서는 수신된 데이터의 무결성과 데이터에 대한 수신자의 인증을 위해 기존의 디지탈 다중 서명을 분석하여 더욱 향상된 디지탈 다중 서명 방식을 제안하고자 한다. 기존의 디지탈 다중 서명 방식이 ID-based한 특징을 갖는데 비해 제안한 디지탈 다중 서명 방식은 이산 대수에 근거해 계산하고 있다. 이 방식은 형식면에서 더욱 간편하고, 계산적인 면에서 랜덤수를 저장하지 않으므로서 현실적이며 효율적이라 할 수 있다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
• /
• 1996.11a
• /
• pp.36-43
• /
• 1996

본 고에서는 기존의 Shamir의 ID를 이용한 디지털 서명 방식에 대하여 분석하여, 이 방식이 서명자가 서명 생성시 동일한 랜덤수를 두 번 이상 사용할 경우 서명자의 비밀 정보가 노출될 수 있음을 보인다. 또한 이러한 문제점을 해결할 수 있는 새로운 ID를 이용한 디지털 서명 방식을 제안하고, 제안된 방식의 안전성과 효율성을 분석하고자 한다.

• Journal of the Korean Data and Information Science Society
• /
• v.26 no.4
• /
• pp.923-930
• /
• 2015

There exist many competition systems to determine a winner. Many sports games use the 1-in-2 tournament or its modified version to determine a winner. In this paper, we propose a competition system that can be used when there are many candidates and many random referees to evaluate the candidates. These competitions can be found in the cyber space where many users score many competing apps. We study fairness of our proposed competing system called a multi-stage random tournament in terms of equal probabilities. We also formulate the influence factor of a specific referee under some specific conditions.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.18 no.5
• /
• pp.111-116
• /
• 2018

This paper introduces the concept of a random universal hash function to amplify security in a quantum key distribution system. It seems to provide security amplification using the relationship between quantum error correction and security. In addition, the approach in terms of security amplification shows that phase error correction offers better security. We explain how the universal hash function enhances security using the BB84 protocol, which is a typical example of QKD(Quantum Key Distribution). Finally, we show that the BB84 protocol using random privacy amplification is safe at higher key rates than Mayers' performance at the same error rate.

• Journal of Korea Game Society
• /
• v.17 no.6
• /
• pp.129-138
• /
• 2017

In football simulation games, it is very important for the interest of the game to make the stats of the football players close to reality. As the management concept is introduced to the sports simulation game, when the user plays the game for a long time, the existing player character retires. Therefore, the game creates the environment of the game by creating a new player in the game. In this study, we propose a method to create a new player character by using genetic algorithm to have the optimal ability similar to existing players. We compare and evaluate the player character with the existing random generation method, the correction random method and the proposed algorithm, and verify the validity of the proposed method.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2000.10a
• /
• pp.789-792
• /
• 2000

차세대 이동통신 시스템의 이용자와 네트워크간 이용자 익명성을 보장하고, 이용자와 네트워크가 상대 실체를 안전하게 상호 인증할 수 있는 공개키 암호 방식에 기반한 개선된 인증 및 키합의 프로토콜을 제안한다. 이 프로토콜은 이용자와 네트워크는 이용자의 고유신분과 세션별로 변하는 랜덤수를 입력으로 하여 임시신분 정보를 생성 및 상호 공유하고, 네트워크는 초기에 이용자의 신분을 확인하며, 임시신분 정보는 이용자와 네트워크가 상호 선택한 랜덤 수에 따라 세션별로 갱신되므로 무선 접속 구간 상에 익명성을 보장하고 기존의 방식에 비교하여 보다 강화된 안전성을 보장한다.

• Journal of Korea Society of Industrial Information Systems
• /
• v.19 no.5
• /
• pp.1-7
• /
• 2014

Distance based mobility management schemes have been considered as a major issue in the wireless network research area. Accordingly, many efforts have been made to analyze them numerically with suitable mobility models. In particular, bidirectional random walk model has been employed frequently due to its simplicity. Nevertheless, the exact equations are not presented so far. In this paper, we provide the exact equations regarding the bidirectional random walk model, which is very useful for the analysis of the distance based mobility management schemes.