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Diop, Mamadou Abdoul,Rathinasamy, Sakthivel,Ndiaye, Abdoul Aziz Springer-Verlag 2016 MEDITERRANEAN JOURNAL OF MATHEMATICS Vol.13 No.5
<P>This paper deals with the existence,uniqueness and asymptotic behaviors of mild solutions to neutral stochastic delay functional integrodifferential equations with impulsive effects, perturbed by a fractional Brownian motion B (H) , with Hurst parameter . We use the theory of resolvent operators developed in Grimmer (Trans Am Math Soc 273(1982):333-349, 2009) to show the existence of mild solutions. An example is provided to illustrate the results of this work.</P>
STABILITY IN THE α-NORM FOR SOME STOCHASTIC PARTIAL FUNCTIONAL INTEGRODIFFERENTIAL EQUATIONS
Diop, Mamadou Abdoul,Ezzinbi, Khalil,Lo, Modou Korean Mathematical Society 2019 대한수학회지 Vol.56 No.1
In this work, we study the existence, uniqueness and stability in the ${\alpha}$-norm of solutions for some stochastic partial functional integrodifferential equations. We suppose that the linear part has an analytic resolvent operator in the sense given in Grimmer [8] and the nonlinear part satisfies a $H{\ddot{o}}lder$ type condition with respect to the ${\alpha}$-norm associated to the linear part. Firstly, we study the existence of the mild solutions. Secondly, we study the exponential stability in pth moment (p > 2). Our results are illustrated by an example. This work extends many previous results on stochastic partial functional differential equations.
Babacar Diop,Dame Diongue,Ousmane Thiare 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.3
Monitoring events using audio sensed data has become recently an interesting research issue in multimedia based surveillance system, due to the proliferation of very tiny sensors, quite powerful to be deployed in harsh environments and to cooperatively detect critical events. Events detection can be performed through capturing, processing and decision making by an automated centralized system. Adding to this the passive nature of sound, wireless sensor networks based surveillance system may enable event detection without any requirement like line of sight, and so perform well in different application cases. In this paper, we bring out the first research element in building an automated surveillance system for rice field monitoring against pest and grain-eating birds. We study how accurate can be the use of normalized power sequences in detecting bird sounds, which is a kind of harmonic sound type. We proposed a simply detection scheme (which can be executed by sensors), for the purpose of detecting the presence of birds based on the sounds and calls they produce. The scheme is based on pruning audio frame blocks to keep relevant peaks, computing the normalized power of the sequences of captured audio files, and derive the presence of birds by only considering important values of the variances of the input files. The experimental results conducted to test the efficiency of the scheme show that 91,07% of bird calls from our database can be correctly identified.
실내실험에 의한 온실 피복재 및 보온재의 관류열전달계수 측정
소레이멘디옵 ( S. Diop ),이종원 ( J. W. Lee ),나욱호 ( O. H. Na ),신동창 ( D. C Shin ),이현우 ( H. W. Lee ) 한국농공학회 2013 한국농공학회 학술대회초록집 Vol.2013 No.-
To optimize the heating system, it is necessary to assess the actual energy saving potential of new covering systems as they are introduced into markets. Many studies have been conducted to reduce energy consumption for greenhouse heating and suggest an overall heat transfer coefficient. However, the coefficients suggested vary greatly because the covering material characteristics, climate conditions and greenhouse environments differ. Accordingly, modification of existing testing methods is required because, in most cases, they are insufficient for greenhouse covering materials. As a result, further studies using the hot box method to determine the thermal transmittance of various greenhouse covering materials have been conducted. This study is conducted by producing an indoor experimental apparatus for measuring the overall heat transfer coefficient with which the actual sky temperature can be implemented and measuring greenhouse coverings and thermal screens available in Korea to compare the results with the measured results in the outdoor experiment and to assess their appropriateness. Experiment is carried out for 12 kinds of treatment conditions according to combination of covering materials and thermal screens and whether there is sky thermal radiation or not. The measuring results show that the overall heat transfer coefficient increases almost straightforward proportionally as the difference in temperature for all of test covering treatments increases in case that sky thermal radiation is not implemented. And in case that sky thermal radiation is implemented the overall heat transfer coefficient becomes the highest when the difference in temperature between inside and outside of the hot box is 10℃ and is significantly lowered when the difference in temperature becomes near 20℃ and after that, there is no significant change and the overall heat transfer coefficient maintains almost constant as the difference in temperature becomes higher than 20℃. Even though slight differences between the indoor experiment results and the outdoor experiment results are shown, they are in accord with the range of standard deviation of the indoor experiment results. These results show that it is reasonable to measure the overall heat transfer coefficient of greenhouse covering materials and thermal screens through the indoor experiment.