Recently,switched Ethernet has become an active area of research because of its wide uses in industry.However,its uses have various real-time constraints on data communications.This paper analyzes the performance of t...Recently,switched Ethernet has become an active area of research because of its wide uses in industry.However,its uses have various real-time constraints on data communications.This paper analyzes the performance of the line topology switched Ethernet as a data acquisition network.Network calculus theory,which has been successfully applied to assess the real-time performance of packet-switched networks,is used to analyze the networks.To properly describe the activity of switches,a novel approach of modeling data flows into or out of switches is addressed.Based on our model,a concisely analytical expression of the maximal end-to-end delay in line topology switched Ethernet is derived.Finally,the relative simulation results are demonstrated.These results agree well with the analytical results,and thus they validate the data flow modeling techniques.展开更多
“Minimizing path delay” is one of the challenges in low Earth orbit (LEO) satellite network routing algo-rithms. Many authors focus on propagation delays with the distance vector but ignore the status information an...“Minimizing path delay” is one of the challenges in low Earth orbit (LEO) satellite network routing algo-rithms. Many authors focus on propagation delays with the distance vector but ignore the status information and processing delays of inter-satellite links. For this purpose, a new discrete-time traffic and topology adap-tive routing (DT-TTAR) algorithm is proposed in this paper. This routing algorithm incorporates both inher-ent dynamics of network topology and variations of traffic load in inter-satellite links. The next hop decision is made by the adaptive link cost metric, depending on arrival rates, time slots and locations of source-destination pairs. Through comprehensive analysis, we derive computation formulas of the main per-formance indexes. Meanwhile, the performances are evaluated through a set of simulations, and compared with other static and adaptive routing mechanisms as a reference. The results show that the proposed DT-TTAR algorithm has better performance of end-to-end delay than other algorithms, especially in high traffic areas.展开更多
The article presents data on the study of phenological phases of blackberries in the Samarkand region in 2022-2023. The influence of differing in weather conditions, especially at the beginning and end of the growing ...The article presents data on the study of phenological phases of blackberries in the Samarkand region in 2022-2023. The influence of differing in weather conditions, especially at the beginning and end of the growing season, on the timing of onset and duration of the main phenophases of the plant is analyzed. The objects of the study were 4 varieties of different genetic and ecological-geographical origin of foreign selection: Brazos, Jumbo, Thornfree and Karaka Black. Phenological observations were carried out according to the classical methodology developed for this crop in Russia. The timing of all phenophases was significantly dependent on the temperature conditions of the growing season: in the year with a higher sum of average daily temperatures, the corresponding phenophases occurred earlier. According to preliminary data, the climatic indicators of the vegetation period of this region allow for the cultivation of blackberries of the main morphological groups (erect, semi-erect, trailing) and different ripening periods.展开更多
文摘Recently,switched Ethernet has become an active area of research because of its wide uses in industry.However,its uses have various real-time constraints on data communications.This paper analyzes the performance of the line topology switched Ethernet as a data acquisition network.Network calculus theory,which has been successfully applied to assess the real-time performance of packet-switched networks,is used to analyze the networks.To properly describe the activity of switches,a novel approach of modeling data flows into or out of switches is addressed.Based on our model,a concisely analytical expression of the maximal end-to-end delay in line topology switched Ethernet is derived.Finally,the relative simulation results are demonstrated.These results agree well with the analytical results,and thus they validate the data flow modeling techniques.
文摘“Minimizing path delay” is one of the challenges in low Earth orbit (LEO) satellite network routing algo-rithms. Many authors focus on propagation delays with the distance vector but ignore the status information and processing delays of inter-satellite links. For this purpose, a new discrete-time traffic and topology adap-tive routing (DT-TTAR) algorithm is proposed in this paper. This routing algorithm incorporates both inher-ent dynamics of network topology and variations of traffic load in inter-satellite links. The next hop decision is made by the adaptive link cost metric, depending on arrival rates, time slots and locations of source-destination pairs. Through comprehensive analysis, we derive computation formulas of the main per-formance indexes. Meanwhile, the performances are evaluated through a set of simulations, and compared with other static and adaptive routing mechanisms as a reference. The results show that the proposed DT-TTAR algorithm has better performance of end-to-end delay than other algorithms, especially in high traffic areas.
文摘The article presents data on the study of phenological phases of blackberries in the Samarkand region in 2022-2023. The influence of differing in weather conditions, especially at the beginning and end of the growing season, on the timing of onset and duration of the main phenophases of the plant is analyzed. The objects of the study were 4 varieties of different genetic and ecological-geographical origin of foreign selection: Brazos, Jumbo, Thornfree and Karaka Black. Phenological observations were carried out according to the classical methodology developed for this crop in Russia. The timing of all phenophases was significantly dependent on the temperature conditions of the growing season: in the year with a higher sum of average daily temperatures, the corresponding phenophases occurred earlier. According to preliminary data, the climatic indicators of the vegetation period of this region allow for the cultivation of blackberries of the main morphological groups (erect, semi-erect, trailing) and different ripening periods.
