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Noise in Structured-Light Stereo Depth Cameras: Modeling and its Applications  [PDF]
Avishek Chatterjee,Venu Madhav Govindu
Computer Science , 2015,
Abstract: Depth maps obtained from commercially available structured-light stereo based depth cameras, such as the Kinect, are easy to use but are affected by significant amounts of noise. This paper is devoted to a study of the intrinsic noise characteristics of such depth maps, i.e. the standard deviation of noise in estimated depth varies quadratically with the distance of the object from the depth camera. We validate this theoretical model against empirical observations and demonstrate the utility of this noise model in three popular applications: depth map denoising, volumetric scan merging for 3D modeling, and identification of 3D planes in depth maps.
Modeling Study of the Impact of Heterogeneous Reactions on Dust Surfaces on Aerosol Optical Depth and Direct Radiative Forcing over East Asia in Springtime
LI Jia-Wei,HAN Zhi-Wei,
LI Jia-Wei
,HAN Zhi-Wei

大气和海洋科学快报 , 2011,
Abstract: The spatial distributions and interannual variations of aerosol concentrations,aerosol optical depth(AOD) ,aerosol direct radiative forcings,and their responses to heterogeneous reactions on dust surfaces over East Asia in March 2006-10 were investigated by utilizing a regional coupled climate-chemistry/aerosol model. Anthropogenic aerosol concentrations(inorganic+carbonaceous) were higher in March 2006 and 2008,whereas soil dust reached its highest levels in March 2006 and 2010,resulting in stronger aerosol radiative forcings in these periods.The domain and five-year(2006-10) monthly mean concentrations of anthropogenic and dust aerosols,AOD,and radiative forcings at the surface(SURF) and at the top of the atmosphere(TOA) in March were 2.4μg m-3,13.1μg m-3,0.18,-19.0 W m-2,and-7.4 W m-2,respectively.Heterogeneous reactions led to an increase of total inorganic aerosol concentration;however,the ambient inorganic aerosol concentration decreased,resulting in a smaller AOD and weaker aerosol radiative forcings.In March 2006 and 2010,the changes in ambient inorganic aerosols,AOD,and aerosol radiative forcings were more evident.In terms of the domain and five-year averages,the total inorganic aerosol concentrations increased by 13.7%(0.17μg m-3) due to heterogeneous reactions,but the ambient inorganic aerosol concentrations were reduced by 10.5%(0.13μg m-3) .As a result,the changes in AOD,SURF and TOA radiative forcings were estimated to be-3.9%(-0.007) ,-1.7%(0.34 W m-2) ,and-4.3%(0.34 W m-2) ,respectively,in March over East Asia.
Spatial modeling of extreme snow depth  [PDF]
Juliette Blanchet,Anthony C. Davison
Statistics , 2011, DOI: 10.1214/11-AOAS464
Abstract: The spatial modeling of extreme snow is important for adequate risk management in Alpine and high altitude countries. A natural approach to such modeling is through the theory of max-stable processes, an infinite-dimensional extension of multivariate extreme value theory. In this paper we describe the application of such processes in modeling the spatial dependence of extreme snow depth in Switzerland, based on data for the winters 1966--2008 at 101 stations. The models we propose rely on a climate transformation that allows us to account for the presence of climate regions and for directional effects, resulting from synoptic weather patterns. Estimation is performed through pairwise likelihood inference and the models are compared using penalized likelihood criteria. The max-stable models provide a much better fit to the joint behavior of the extremes than do independence or full dependence models.
Direct Load Control Programs by using of Logarithmic Modeling in Electricity Markets  [cached]
Shoorangiz Shams Shamsabad Farahani,Hossain Tourang,Behrang Yousefpour,Mehdi Ghasemi Naraghi
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: In this study a logarithmic modeling for Direct Load Control programs (DLC) as incentive-based Demand Response Programs (DRPs) is presented. The proposed model considers nonlinear behavioral characteristic of elastic loads which causes to more realistic modeling of demand response to DLC rates. To demonstrate the validity of the proposed technique, a real world power system is considered as test system. Where, Iranian power system is investigated. Simulation results emphasis on the effectiveness impact of running DLC programs using proposed logarithmic model on load profile of the peak day of the proposed power system.
Peak Load Modeling for Kingdom of Bahrain  [PDF]
Isa S. Qamber
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.512B010
Abstract: Deriving some models to estimate the electrical demand for future for the Kingdom of Bahrain is carried out in the present study. The ambient temperature is taken into the account as well as the time factor (Year). The model was developed in away describing the electric power demand during a summer period. The estimated values of the maximum electrical load is obtained and evaluated on actual peak load data of the Kingdom of Bahrain.
Modeling and Validation of Electrical Load Profiling in Residential Buildings in Singapore  [PDF]
Luo Chuan,Abhisek Ukil
Computer Science , 2015, DOI: 10.1109/TPWRS.2014.2367509
Abstract: The demand of electricity keeps increasing in this modern society and the behavior of customers vary greatly from time to time, city to city, type to type, etc. Generally, buildings are classified into residential, commercial and industrial. This study is aimed to distinguish the types of residential buildings in Singapore and establish a mathematical model to represent and model the load profile of each type. Modeling household energy consumption is the first step in exploring the possible demand response and load reduction opportunities under the smart grid initiative. Residential electricity load profiling includes the details on the electrical appliances, its energy requirement, and consumption pattern. The model is generated with a bottom-up load model. Simulation is performed for daily load profiles of 1 or 2 rooms, 3 rooms, 4 rooms and 5 rooms public housing. The simulated load profile is successfully validated against the measured electricity consumption data, using a web-based Customer Energy Portal (CEP) at the campus housings of Nanyang Technological University, Singapore.
Depth-Optimized Reversible Circuit Synthesis  [PDF]
Mona Arabzadeh,Morteza Saheb Zamani,Mehdi Sedighi,Mehdi Saeedi
Computer Science , 2012, DOI: 10.1007/s11128-012-0482-8
Abstract: In this paper, simultaneous reduction of circuit depth and synthesis cost of reversible circuits in quantum technologies with limited interaction is addressed. We developed a cycle-based synthesis algorithm which uses negative controls and limited distance between gate lines. To improve circuit depth, a new parallel structure is introduced in which before synthesis a set of disjoint cycles are extracted from the input specification and distributed into some subsets. The cycles of each subset are synthesized independently on different sets of ancillae. Accordingly, each disjoint set can be synthesized by ?different synthesis methods. Our analysis shows that the best worst-case synthesis cost of reversible circuits in the linear nearest neighbor architecture is improved by the proposed approach. Our experimental results reveal the effectiveness of the proposed approach to reduce cost and circuit depth for several benchmarks.
Modeling Airplane Load Sheet using Wireless Communication  [PDF]
H.A. Farhan,H.H. Owaied,M.A. Shanableh
Information Technology Journal , 2011,
Abstract: This study, represents a model of load sheet for generate and print the load sheet wirelessly in the airport environment. The proposed model, suggests generating wirelessly load sheet, including all processing of filling, checking, signing and printing the load sheet from the loading area, depending on the communication capabilities that already available between all devices. Such as wireless printer, wireless access points and wireless router. The proposed model will be suitable for all types of airport environment, through making the task for the load control agent and the captain achieved more efficiently. The main benefits from the proposed model are: it saves time, effort and reduces the overall operating cost of the aircraft. The proposed model represents an efficient integrated method, which takes the advantages of the wireless communication.
MODELING AND SIMULATION OF AMMONIA SYNTHESIS REACTOR  [PDF]
Ali Dashti,Kayvan Khorsand,Mehdi Ahmadi Marvast,Madjid Kakavand
Petroleum and Coal , 2006,
Abstract: In this paper an industrial ammonia synthesis reactor has been modeled. The reactor under study is of horizontal type. This reactor which is under the license of Kellogg Company is equipped with three axial flow catalyst beds and an internal heat exchanger in accompany with a cooling flow. The achieved modeling is one dimensional and non-homogenous. Considering the sever effect of internal heat exchanger on reactor operation, it has been simulated by calculation of film heat transfer coefficients in its tube and shell and then, taking into account the shell thermal resistance and fouling coefficient, obtaining the overall heat transfer coefficient. So in the developed software, the heat transfer coefficient is first calculated using the conditions of the input flow to the exchanger and then the input flows to the first and second beds are calculated. The differential equations have been solved using Rung Kutta 4 method and the results have been compared with the available industrial data. Finally the capability of the developed software for industrial application has been investigated by changing the reactor operation conditions and studying their effects on reactor output.
Optimizing the Use of Secchi Depth as a Proxy for Euphotic?Depth in Coastal Waters: An Empirical Study from?the Baltic Sea  [PDF]
Hanna Luhtala,Harri Tolvanen
ISPRS International Journal of Geo-Information , 2013, DOI: 10.3390/ijgi2041153
Abstract: Potential zone for photosynthesis in natural waters is restricted to a relatively thin illuminated surface water layer. The thickness of this layer is often indirectly estimated by measuring the depth in which 1% of the photosynthetically active radiation entering the water remains. This depth is referred to as the euphotic depth. A coarser way to evaluate the underwater light penetration is to measure the Secchi depth, which is a visual measure of water transparency. The numerical relationship between these two optical parameters, i.e.,?conversion coefficient m, varies according to the changes in the optical properties of water, especially in transitional coastal waters. The aim of our study is to assess which is the most suitable criterion to base these coefficients on. We tested nine methods, seven of which were locally calibrated with our own in situ data from the optically heterogeneous Baltic Sea archipelago coast of SW Finland. We managed to significantly improve the accuracy of modeling euphotic depths from Secchi depths by using scalable and locally calibrated methods instead of a single fixed coefficient. The best results were achieved by using methods, either continuous functions or series of constants, which are based on water transparency values.
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