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서재영 ( Jaeyoung Seo ),작드수렝투무르호약 ( Zagdsuren Tumurkhuyag ),백장현 ( Jang Hyun Baek ) 조선대학교 공학기술연구원 2021 공학기술논문지 Vol.14 No.1
In this study, a route-based group location registration (RGR) scheme is considered to reduce location registration and paging costs when there are many mobile stations (MSs) in a transportation system (TS) such as bus and train routes. In addition to adopting the existing group location tracking (GLT) scheme, the RGR scheme tries to minimize the total signaling cost by using the mobility characteristics of the TS whereby vehicles move along a specified route from the point of departure to the destination. In this study, we propose a 2-step paging (2SP) scheme based on an estimation of the location of the vehicles of a TS to reduce the paging cost of the RGR scheme. In this 2SP scheme, when an incoming call occurs, the first paging area is determined in accordance with an estimation of the location of the TS vehicle using the time from location registration to call occurrence. Since the moving speed of the TS vehicle is almost constant, the probability that the first paging will succeed is very high, which reduces the paging cost by roughly half. Numerical results show that the larger the route threshold K in the RGR scheme, the larger the reduction in total cost because of the 2SP effect. As a result, it can be seen that 2SP increases the optimal K, which minimizes the total cost compared with simultaneous paging. The results of this study can be used for mobility management research of mobile networks as well as for performance analysis of mobility management schemes.
Genetic Structure of Mongolian Goat Populations Using Microsatellite Loci Analysis
Takahashi, H.,Nyamsamba, D.,Mandakh, B.,Zagdsuren, Yo.,Amano, T.,Nomura, K.,Yokohama, M.,Ito, S.,Minezawa, M. Asian Australasian Association of Animal Productio 2008 Animal Bioscience Vol.21 No.7
We studied genetic diversity and relationships among Mongolian goat populations on the basis of microsatellite DNA polymorphisms. DNA samples from eight populations (Bayandelger, Ulgii Red, Zavkhan Buural, Sumber, Zalaajinst White, Erchim Black, Dorgon, and Gobi Gurvan Saikhan) from geographically distinct areas of Mongolia were analyzed by using 10 microsatellite DNA markers. Since the 10 markers were highly polymorphic, the genetic characteristics of these native goat populations could be estimated. Genetic diversity within populations, as estimated by the expected heterozygosities, was high, ranging from 0.719 to 0.746, but genetic differentiation between populations was low, representing only 1.7% of the total genetic variation. The results suggest that Mongolian native goat populations still have a semi-wild genetic structure reflecting traditional Mongolian nomadism and the short history of artificial selection. The genetic relationships among the populations were not clear in the neighbor-joining tree generated from the modified Cavalli-Sforza chord genetic distances. By using principal components analysis, the five core populations of Mongolian native goats (Bayandelger, Ulgii Red, Zavkhan Buural, Sumber, and Dorgon) and the populations crossed with Russian breeds (Zalaajinst White, Erchim Black, and Gobi Gurvan Saikhan) were distinguished. There was no correlation between genetic relationships among the populations and the geographical distribution of the populations.
이동통신 네트워크에서 방향 기준 위치등록과 라인 페이징의 정확한 모델링 및 성능 분석
서재준 ( Jae Joon Suh ),작드수렝투무르호약 ( Zagdsuren Tumurkhuyag ),백장현 ( Jang Hyun Baek ) 조선대학교 공학기술연구원 2020 공학기술논문지 Vol.13 No.2
An efficient location management plays an important role in mobile communication networks. In this study, a direction-based location registration (DIR) scheme and its modified scheme called a unidirection-based location registration (uniDIR), both of which adopt a line paging to reduce paging costs, are considered. The problems of the previous performance analysis method for DIR and uniDIR are pointed out, and a new accurate analysis model to properly analyze the correct performance is proposed. Using the new analysis method, the exact performance of DIR and uniDIR is obtained, and the performance comparison results of the two schemes are presented. According to the results of performance analyses in various environments, this study confirms that DIR has better performance than uniDIR in most cases despite the reduction in paging cost.