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1.
目的:了解医学生的上网情况。方法:采用"医学生上网调查问卷",在七个不同专业500名学生中进行问卷调查。结果:有95.16%学生上网,上网学生中30.25%每次上网3h以上;上网目的以聊天、多媒体娱乐和玩游戏为主。结论:青年群体是网上的主力军,应警惕大学生网上迷路,鼓励上网学生要以理智态度控制上网时间,老师和学校应给予学生上网以恰当的引导和教育。 相似文献
2.
INDRANIL SEN GUPTA 《International journal of systems science》2013,44(12):2419-2426
The problem of minimizing the number of links and buses in a digital system subject to a given set of concurrency constraints among data transfers is studied. The notion of the transfer graph (TG) is introduced which depicts the data transfer paths and concurrency requirements in the system, A very simple node labelling procedure is applied on the nodes of the TG, which enables one to make a direct assignment of transfers to buses without going through any elaborate computational steps. 相似文献
3.
DIPANWITA ROY CHOWDHURY INDRANIL SEN GUPTA 《International journal of systems science》2013,44(8):1503-1513
The P-model approach of modeling a combinational digital network using Petri nets is introduced. In this model a given logic circuit its represented by a graph With only two types of nodes, places and transitions. A logic 1 value in any line of the circuit corresponds to the presence of a so-called token, and a logic 0 corresponds to the absence of tokens, in the corresponding place of the P-model. The operation of the circuit is reflected in the execution of the P-model resulting from the firing of transitions. Several minimizing transformations in the P-model domain are discussed, which reduces the number of places and transitions by an order of magnitude. Based on this P-model representation of a logic circuit, a logic simulation algorithm is outlined. The method is faster and also simpler to implement than conventional simulation techniques. 相似文献
4.
针对次氧化锌烟尘湿法冶炼系统的体积平衡难以控制的难题,本文以年处理次氧化锌烟尘6万t,产出电锌2万t的冶炼系统为例进行了体积平衡计算和分析,对冶炼企业的生产管理提供理论依据和技术指导。 相似文献
5.
In this paper, an attempt has been made to develop a model for determining the optimal policy for felling and planting trees of a particular species in a forest, in order to maximize the total yield over a specified period of time. The model takes into account not only the time at which trees should be felled but also how many trees and of what age. 相似文献
6.
M. DE LA SEN 《控制论与系统》2013,44(2-3):125-150
Abstract A perturbation theory for evaluation algorithms of arithmetic expressions is applied to the generalized least-squares identification of the continuous parameters by using nonperiodic discrete data. The sampling instants are distributed in such a way that a sequence of the elemental arithmetic expressions of the identification algorithm are suboptimized according to bang-bang rules on the extrema of appropriate variation intervals. The weighting scalars in the generalized least-squares method are updated with the same purpose. 相似文献
7.
P. K. KARMAKAR S. DEVBARMAN S. CHATTOPADHYAY A. K. SEN 《International journal of remote sensing》2013,34(7):1537-1541
A characteristic feature of the lingering of post-rain attenuation over Calcutta, India, has been observed by 22·235 GHz radiometer. This feature is presumably due to the injection of extra water vapour during the post-rain period in the presence of large ambient humidity and low wind activity. Experimentally observed post-rain attenuation was found to be mostly due to the vertical diffusion of water vapour into the raining zone, the contribution due to horizontal diffusion being small compared to that of the vertical diffusion. 相似文献
8.
9.
M. DE LA SEN 《International journal of control》2013,86(6):1769-1775
In this note, it is proved that stability of composite systems including parallel subsystems can be achieved for certain sets of initial conditions and additional stability assumptions for the non-hyperstable subsystems. It is required that at least one subsystem be asymptotically hyperstable. 相似文献
10.
A limited survey was carried out to determine the nitrosamine content of several varieties of alcoholic beverages (beer and ale, whiskey, wine, cider, etc.) sold in Canada. Of 22 samples of different beers and ales analyzed all but one contained traces of dimethylnitrosamine; the overall mean level found was 1.5 ppb. Only one Canadian rye and one Scotch whiskey out of a total of 13 samples contained traces of either dimethylnitrosamine or diethylnitrosamine. All the 8 wines and 7 cider samples were negative. 相似文献