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5G 이동통신 셀 설계를 위한 타부 탐색과 유전 알고리즘의 성능
권오현,안흥섭,최승원,Kwon, Ohyun,Ahn, Heungseop,Choi, Seungwon 디지털산업정보학회 2017 디지털산업정보학회논문지 Vol.13 No.3
The fifth generation(5G) of wireless networks will connect not only smart phone but also unimaginable things. Therefore, 5G cellular network is facing the soaring traffic demand of numerous user devices. To solve this problem, a huge amount of 5G base stations will need to be installed. The base station positioning problem is an NP-hard problem that does not know how long it will take to solve the problem. Because, it can not find an answer other than to check the number of all cases. In this paper, to solve the NP hard problem, we compare the tabu search and the genetic algorithm using real maps for optimal cell planning. We also perform Monte Carlo simulations to study the performance of the Tabu search and Genetic algorithm for 5G cell planning. As a results, Tabu search required 2.95 times less computation time than Genetic algorithm and showed accuracy difference of 2dBm.
프로토콜 바인딩 기법을 적용한 단일인증기반 이질적 인증시스템의 통합에 관현 연구
권오현(Ohyun Kwon),황준(Jun Hwang),김영찬(Youngchan Kim) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
인터넷의 사용이 날로 증가함에 따라 전자상거래가 인터넷을 통해 활발하게 이루어지는데 있어서 금융권 및 각종 기타 기관에서는 인증서 기반의 전자서명을 사용하고 있다. 이러한 인증서 기반의 시스템은 궁극적으로 SSO(Single Sign-On)를 지향하는데, 동일 인증기관 내의 모든 서비스는 단 한 번의 접속으로 모두 사용할 수 있게 하는 것이 그 목적이다. 그러나 SSO는 동일 인증기관이라는 제약사항이 따르기 때문에 인터넷을 이용하는 사용자들이 각 인증기관별로 인증서를 따로 관리하게 되는 불편함이 생기게 된다. 따라서 본 논문에서는 OASIS에서 발표한 SAML을 이용하여 다른 이질적인 인증 기관간의 인증을 통합 할 수 있는 방법을 제시하고자 한다.
절화장미 ‘엔틱컬’ 품종의 인공광원별 생육과 화색의 차이 분석
박기영(Park, KiYoung),김유선(Kim, YooSun),권오현(Kwon, OHyun) 한국색채학회 2020 한국색채학회 논문집 Vol.34 No.3
This study aimed to evaluate the differences in growth, development, and color of ‘Antique Curl’ cut rose flowers in response to different artificial light sources. Experiments were conducted in a glass greenhouse facility with an environment similar to that maintained by rose farmers, with a supply of nutrient solution and insecticides through a drip system while maintaining a temperature of 15 °C or higher. The growth was measured with the length and thickness of the rose stem and the assessment of photosynthesis and chlorophyll. Also, the color of the flowers was assessed using a spectrophotometer and visual analysis. The results of this study are as follows: First, the best possible results for the development and color of flowers, according to horticultural standards, were observed under an induction sodium lamp. Second, the difference in growth and development, depending on the type of artificial light source used, was less as compared to the difference in flower color. The flower color showed marked differences depending on the type of artificial light. This result shows that a variety of flowering plants can be produced using artificial light sources, and developing such variety in flower products could increase their economic value. However, it is necessary to consider other variables, such as the lifespan of roses, preferred colors, and various species per customer preferences, for future research.
남정무,김병건,구자성,박종무,이정주,권오현,Nam, Jungmoo,Kim, Byung-Kun,Koo, Ja-Seong,Park, Jongmoo,Lee, JungJu,Kwon, Ohyun 대한임상신경생리학회 2007 Annals of Clinical Neurophysiology Vol.9 No.2
Spinocerebellar ataxia type 2 (SCA2) is characterized by progressive cerebellar ataxia and slow saccades. A 40-year-old woman presented with progressive gait disturbance and ataxia over 15 years. Neurologic examination revealed scanning speech, ataxia, and hyporeflexia. Brain CT showed diffuse atrophy of the cerebellum. Electronystagmography demonstrated slowed saccades with normal accuracy and delayed latency. The diagnosis of SCA2 was confirmed by the genetic test. Documentation of slow saccades may help differentiation among SCA subgroups.