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Optimal Resource Allocation for Integrated Optical Path and Optical Packet Switch
Dang-Quang Bui,Hiroaki Harai,Won-Joo Hwang 한국멀티미디어학회 2010 한국멀티미디어학회 학술발표논문집 Vol.2010 No.1
Integration of optical paths and packets in a switch is one of key techniques to support ultra-highspeed traffic in New Generation Networks. However, the question on how to efficiently allocate wavelengths for optical packets and optical paths has not been solved yet because there lacks of a systematic model for evaluating performance of the integrated switch. In this paper, we model the operation of the integrated switch as a system of two queueing models: M/M/x/x for optical paths and M/M/1/LPS for optical packets. From the model, we find an optimal policy to dynamically allocate wavelength resources in an integrated switch. The simulation shows that our mechanism has better performance than other methods.
Yahaya, M.S.,Kimura, A.,Harai, J.,Nguyen, H.V.,Kawai, M.,Takahashi, J.,Matsuoka, S. Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.12
The evaluation of structural carbohydrate losses and its effect on silages digestibility in alfalfa (Medicago sativa L.) and orchardgrass (Dactylis glomerata L.) was studied during 5, 21 and 56 days ensiling. About 70 and 60 kg fresh matter of the two forages were ensiled in 9 silos of 120 L capacity. The digestion trials were conducted in two phases using the two grasses in two $4{\times}4$ Latin square design according to the four treatments being the grass and the three silages. There were no differences in the DM and CP contents resulting from 5 to 56 days ensiling in both forages. The water-soluble carbohydrates (WSC), hemicelllose, pectin, and energy were slightly reduced and appeared lower in 56 days silage. The ether extract and cellulose contents slightly increased as the ensiling process advanced in the two species. Hemicellulose losses of 29 and 41 g/kg DM were obtained in alfalfa and orchardgrass, respectively, 56 days after ensiling. While the cellulose losses in both species were very little, compared to that for hemicellulose, the pectin losses, 56 days after ensiling were 15 and 12 g/kg DM in alfalfa and orchardgras respectively. The total structural carbohydrates lost (ie., hemicellulose + cellulose + pectin) in g/kg DM of fresh material forage ensiled, is about four fifths the amount lost by WSC, in alfalfa and about two thirds, in orchardgrass, by 21 days ensiling after the activity of microorganism terminated, indicating that appreciable amount was used as substrate for silage fermentation. Ensiling alfalfa and orchardgrass for 0, 5, 21 and 56 days maintained a decreasing trend of 83.8, 82.5, 79.3 and 78.9% digestibility in alfalfa and 80.5, 77.0, 77.1 and 76.4% digestibility in orchardgrass. While the digestibility of cellulose and ether extract increased in silage in both species, the digestible energy values in silage were reduced from 2.6 to 2.3 and 2.9 to 2.7 Mcal/kg DM respectively in alfalfa and orchard during 5-56 days ensiling.
Dynamic Wavelength Allocation for Integrated Optical Path and Optical Packet Switch
Khanh-Huy Nguyen,Dang-Quang Bui,Hiroaki Harai,Won-Joo Hwang 한국멀티미디어학회 2010 한국멀티미디어학회 국제학술대회 Vol.2010 No.-
This paper models the operation of the integrated optical path and optical packet switch as a system of two servers, one for optical paths and the other for optical packets. From the model, we utilize Newton method to find an optimal policy for sharing of wavelength resources. Afterwards, we propose an algorithm to dynamically allocate wavelength resources in an integrated switch. Finally, we evaluate performance of the algorithm.
The Algorithm Improves Performance of The Integrated Optical Path and Optical Packet Switch
Dang-Quang BUI,Khanh-Huy NGUYEN,Hiroaki HARAI,Won-Joo HWANG 한국멀티미디어학회 2010 한국멀티미디어학회 학술발표논문집 Vol.2010 No.1
In New Generation Networks, integration of optical paths and packets in a switch is one of key techniques to support ultra-high-speed traffic. However, the wavelength allocation for optical packets and optical paths has not been efficiently resolved yet. In this paper, from modeling the operation of the integrated switch as a system of two servers, one for optical paths and the other for optical packets, we utilize Newton method to find an optimal policy for sharing of wavelength resources. Then, we propose an algorithm to dynamically allocate wavelength resources in an integrated switch. Finally, we evaluate performance of that algorithm.