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Slotted ALOHA Based Greedy Relay Selection in Large-scale Wireless Networks
( Fengchen Ouyang ),( Jianhua Ge ),( Fengkui Gong ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.10
Since the decentralized structure and the blindness of a large-scale wireless network make it difficult to collect the real-time channel state or other information from random distributed relays, a fundamental question is whether it is feasible to perform the relay selection without this knowledge. In this paper, a Slotted ALOHA based Greedy Relay Selection (SAGRS) scheme is presented. The proposed scheme allows the relays satisfying the user`s minimum transmission request to compete for selection by randomly accessing the channel through the slotted ALOHA protocol without the need for the information collection procedure. Moreover, a greedy selection mechanism is introduced with which a user can wait for an even better relay when a suitable one is successfully stored. The optimal access probability of a relay is determined through the utilization of the available relay region, a geographical region consisting of all the relays that satisfy the minimum transmission demand of the user. The average number of the selection slots and the failure probability of the scheme are analyzed in this paper. By simulations, the validation and the effectiveness of the SAGRS scheme are confirmed. With a balance between the selection slots and the instantaneous rate of the selected relay, the proposed scheme outperforms other random access selection schemes.
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꿀벌(Apis mellifera L.) 교배조합의 질병저항성 평가
이명렬(Myeong-Lyeol Lee),Ge FengChen,이만영(Man-Young Lee),김영수(Young-Soo Kim),윤병수(Byoung-Su Yoon) 한국양봉학회 2006 韓國養蜂學會誌 Vol.21 No.1
Hygienic behavior and degree of chalk brood infection were evaluated from the ten crossed lines of honeybee accord to the Korea-China Joint Research Program in 2003. The crossed line no. 6 and no. 9 were significantly less infected (2.5 ± 0.6 and 4.5 ± 1.8 larvae respectively) by chalk brood disease than the other eight lines (11.0~29.8 larvae). The crossed line no. 6 also showed the lowest accumulated infection degree of chalk brood from seven times of observation during the year. The hygienic behaviors of experimental bee lines were estimated by nest cleaning ability for frozen and killed bee pupae by liquid nitrogen. The removal rate of dead pupae 24 hours after liquid nitrogen treatment was also the highest (95.3%) in the colonies of no. 6 line, which had revealed the lest infection level of chalk brood. The nest cleaning activities of other lines were ranged from 44% to 89%. The correlation coefficient between hygienic behavior and chalk brrod infection level was r=-0.731 (y=-0.0214x+3.23, p=0.06).
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이만영(Man-Young Lee),葛鳳晨(Ge Fengchen) 한국양봉학회 2005 韓國養蜂學會誌 Vol.20 No.2
The Jilin Provincial Institute of Apicultural Science has been researching on honeybees for more than 40 years and breeding various races of queen bee, which had been appointed as a national honeybee breeding organization in 1989. Now, it has 6 branches of breeding places and propagates 18 commercial products of queens into beekeeping farmers. About 40% of the spreading queens were produced by the instrumental (artificial) insemination technique that have already set up as a fixed skill in the Jilin Provincial Institute of Apicultural Science. Two main points of the instrumental insemination are the collecting of drones and the injection the semens into queens. Besides, the collection of drones should be administrated during the time from 11:00-13:00 in spring and from 13:00-15:00 in summer for the best efficiency. The percentage of drone emitted semen was 72.0% and the amount of collected semen was 0.92㎕ per a drone. The injection of semen was 4㎕ in one time and total 2 times at l-day interval. The required time of semen-injection per a queen was about 34.3 seconds.
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이만영(Man-Young Lee),葛鳳晨(Ge Fengchen) 한국양봉학회 2006 韓國養蜂學會誌 Vol.21 No.2
The superior queen was selected by a basic evaluation such as the number of eggs, worker bees, the rate of capped pupa, and the survival of wintering and by a target evaluation such as the improvement of the apicultural products and the resistance of the pest. It was observed that the parasitic rate of the resistant line to Varroa destructor was lowered by 8 to 10 times than that of the susceptible line. Not only queen rearing but also drone rearing was very important in breeding of the selected superior line. The drone for mating should be reared 20 days before the second drafting of larva for virgin queen and also fed by an abundant and qualified diet. The drafting of the worker larva also should be managed by two times in every two days. The breeding colony for the superior queen consists of so many worker bees as the 80 percents per the comb. The mating system of the honey bee had an instrumental insemination and natural mating. The entrances of the mated queen into the nuclear of colony was applied to 4 steps, the installation of three combs in the super colony, the establish colony of confined queen, the exchange of comb between basal and super colony, and the final combining the whole colony. It requires about 10 days until becoming a normal colony. The two-queen system in one colony was managed to control the breeding potential of worker bees as well as the productivity of egg-laying by queens. The wintering of honeybee in the northeast of China was mostly indoor. The average temperature of the indoor was observed - 0.2, - 0.6, and - 0.7℃ in Dec., Jan., and Feb. respectively, whereas outdoor -10.7, - 15.1, and -16.1℃ respectively. The first plant visited by worker bee after wintering was Adonis amurensis flowered at April 6, 2005 in this area. Tilia amurensis, the most honey plant, bloomed at June 28, 2005.
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이만영(Man-Young Lee),이명렬(Myeong-Lyeol Lee),김영수(Young-Soo Kim),이광길(Kwang-Gill Lee),조상균(Sang-Kyun Cho),Ge Fengchen 한국양봉학회 2007 韓國養蜂學會誌 Vol.22 No.2
It has been known that the royal jelly is ranked the second apicultural product by beekeeper. It has been carried out to develop the method of grafting larva and colony management in order to improve the yield of royal jelly. The yield of royal jelly with pre-treatment of queen cell before grafting larva was significantly higher 51.0% and 13.6g, respectively in the acceptance rate of larva and the total yield of royal jelly. The using of 12hr aged larvae for grafting investigated to the most suitable in the productivity of royal jelly. The grafting larva of two times was 12.1 and 7.3g higher in the acceptance rate of larva and yield of royal jelly than that of one time. However, it has to apply only the smaller beekeeper due to the complication of grafting larva. The arrangement of comb including new capped pupa at both side of royal jelly frame was higher than that of non-pupa comb in the acceptance rate of larva and total yield of royal jelly.
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