ali habibi - Academia.edu (original) (raw)

Papers by ali habibi

IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 2006

Transaction level modeling allows exploring several SoC design architectures leading to better pe... more Transaction level modeling allows exploring several SoC design architectures leading to better performance and easier verification of the final product. In this paper, we present an approach to design and verify SystemC models at the transaction level. We integrate the verification as part of the design-flow where we first model both the design and the properties (written in PSL) in UML; then, we translate them into an intermediate format modeled with AsmL (language based on Abstract State Machines (ASM)). The AsmL model is used to generate an FSM of the design including the properties. Checking the correctness of the properties is performed on-the-fly while generating the state machine. Finally, we translate the verified design to SystemC and map the properties to a set of assertions (as monitors in C#) that can be reused to validate the design at lower levels by simulation. For existing SystemC designs, we propose to translate the code back to AsmL in order to apply the same verification approach. At the SystemC level, we also present a genetic algorithm to enhance the assertions coverage. We will ensure the soundness of our approach by proving the correctness of the SystemC to AsmL and AsmL to SystemC transformations. We illustrate our approach on two case studies including the PCI bus standard and a Master/Slave generic architecture from the SystemC library.

2004 International Symposium on System-on-Chip, 2004. Proceedings.

Abshaef-In this paper, we present an approach to design and verify SystemC intellectual propertie... more Abshaef-In this paper, we present an approach to design and verify SystemC intellectual properties (IPS). We considered as illustrative case a PCI bus modeled us a monitor module that can he interfaced to existent SystemC IPS. We defined three design steps where we first model the bus in UML; then, design it completely with Abstract State Machines (ASM); and, finally, translate the ASM code to SystemC. We considered an intermediate ASM representation in order to extract the finite state machine of the bus that can be used to for model checking of PSL properties. The final SystemC monitor block can be seen as a stand-alone PCI IP as well as a verification module to validate other SystemC PCI compatible devices. Besides, our design offers a Eexihle and easy to configure IP that supports a large number of masterlslave devices.

The 3rd IEEE International Workshop on System-on-Chip for Real-Time Applications, 2003. Proceedings.

Advancement in the microelectronics era made it possible the integration of a complete yet comple... more Advancement in the microelectronics era made it possible the integration of a complete yet complex system on a single chip. Over 10 million gates, integrated together and running a real-time optimized software red crossed classical design techniques. Register level will serve as an assembly language for the new design languages or so called system level languages. The problematic is to define a language that can allow the design of such a complex systems. In this paper, we explore different paradigms of state-of-the-art of the System-ona-Chip (SoC) modeling and design. In particular, this paper presents the main proposals in defining a system level language and discusses their advantages and drawbacks.

Zenith International Journal of Business Economics Management Research, 2012

In this paper, a statistical analysis is represented on financial data related to Apollo Global M... more In this paper, a statistical analysis is represented on financial data related to Apollo Global Management, LLC, a prominent global private equity firm, from the viewpoint of an important measure of financial performance, i.e. Economic Net Income, and also its components using Descriptive Statistics, Bivariate Correlation Test, and Curve Estimation. This analysis has been accomplished to identify the correlation between the aforementioned measure of financial performance and its components, and ultimately to estimate relative variation patterns of the former in terms of time and also its significantly-correlated components. Such patterns can be utilized to estimate and evaluate the values of Economic Net Income as a measure of the firm's financial performance based on expected or observed values of its main determinative components. This paper mainly aims to represent a beneficial analytical approach to assess financial performance of a private equity firm and effectiveness and efficiency of strategies of private equity investment in various industries.

$Research paper thumbnail of Liquid uptake of gas shales: A workflow to estimate water loss during shut-in periods after fracturing operations$

Journal of Unconventional Oil and Gas Resources, 2014

The imbibition of fracturing fluid into the shale matrix is identified as one of the possible mec... more The imbibition of fracturing fluid into the shale matrix is identified as one of the possible mechanisms leading to high volumes of water loss to the formation in hydraulically fractured shale reservoirs. In an earlier study (Makhanov et al, 2012), several spontaneous imbibition experiments were conducted using actual shale core samples collected from Fort Simpson, Muskwa and Otter Park formations, all belong to the Horn River shale basin. This study provides additional experimental data on how imbibition rate depends on type and concentration of salts, surfactants, viscosifiers and sample orientation with regard to the bedding plane. The study also proposes and applies a simple methodology to scale up the lab data for field-scale predictions. The data shows that an anionic surfactant reduces the imbibition rate due to the surface tension reduction. The imbibition rate is even further reduced when KCl salt is added to the surfactant solution. Surprisingly, viscous XG solutions show a considerable spontaneous imbibition rate when exposed to organic shales, although their viscosity is much higher than water viscosity. This observation indicates that water uptake of clay-rich organic shales is mainly controlled through preferential adsorption of water molecules by the clay particles, and high bulk viscosity of the polymer solution can only partly reduce the rate of water uptake. The field scale calculations show that water loss due to the spontaneous imbibition during the shut-in period is a strong function of fluid/shale properties, fracture-matrix interface, and soaking time. The presented data and analyses can be used to explain why some fractured horizontal wells completed in gas shales show poor water recovery and an immediate gas production after extended shut-in periods.

IEEE CCECE2002. Canadian Conference on Electrical and Computer Engineering. Conference Proceedings (Cat. No.02CH37373)

In this paper, we describe formal modelling of the digital signal processors of the family ADSP-2... more In this paper, we describe formal modelling of the digital signal processors of the family ADSP-2100 using the HOL (Higher Order Logic) theorem prover. While specifying the behavior and implementation of the processor, we solved the problem of complexity related to the large number of parameters by using a structured method based on our knowledge about the processor architecture. We show details of the specification strategy used and display few illustrative examples.

Offshore Technology Conference-Asia, 2014

ABSTRACT Wettability is always an important issue for reservoir engineers. Wettability alteration... more ABSTRACT Wettability is always an important issue for reservoir engineers. Wettability alteration is one of the significant indexes to show the capability of oil recovery of reservoir. In the recent years, various approaches to change wettability have been suggested by scientists and researchers such as chemical flooding and nanofluid injection. The purpose, in oil wet condition, is to change wettability to water wet condition to obtain more recovery. A lot of different methods for wettability measurement such as Contact Angle, Amott methods and USBM are proposed by Anderson and others. The most accurate method is contact angle for wettability measurement. Plasma is one of the four fundamental states of matter. Heating a gas may ionize its molecules or atoms thus turning it into a plasma which contains charged particles: positive ions and negative electrons or ions. A nonthermal plasma is in general any plasma which is not in thermodynamic equilibrium, either because the ion temperature is different from the electron temperature or because the velocity distribution of one of the species does not follow a distribution. The effect of cold atmospheric argon/oxygen plasma torch based on dielectric barrier discharge was investigated on different surfaces. The experiments were conducted on the mica, glass slide and slice of dolomite core surface which is aged with oil and without oil and on a dolomite core with oil after waterflooding. The time interval of plasma torch treatment on these surfaces were 1, 3 and 5 minutes and contact angle measurements done 1, 14 and 28 minutes after plasma treatment. The range of contact angle decrease is between 5 to 41 degree and Fourier Transform Infrared Radiation (FTIR) spectroscopy was carried out for analysis of surface chemistry. It is worth mentioning, however, that it is a novel method and requires more investigation in order to be feasible in reservoir conditions.

Journal of Advanced Microscopy Research, 2012

ABSTRACT Formation damage as a result of fines migration causes drastic reduction of rock permeab... more ABSTRACT Formation damage as a result of fines migration causes drastic reduction of rock permeability; then, retracts hydrocarbon production rate. When the brine salinity which presents in the core reduced to its critical salt concentration (CSC), fine particles initiate the release process. In this study, MgO nanofluid was prepared and its stable sample was characterized based on the transmission electron microscopy analysis. Afterward, stable MgO nanofluid injection into Berea sandstone cores was perform to investigate the effect of nanofluid injection on fines triggering prevention. The obtained results showed significant disparities in permeability ratios between two cores with/without nanofluid treatment. Permeability reduction occurred up to 95% of inchoate permeability for no treatment case which is demonstrated by scanning electron microscopy analysis and MgO nanofluid could lessen fine particles release in the water shock phenomenon and fix them for the case with nanofluid treatment.

IEEE Transactions on Communications, 1974

Two hybrid coding systems utilizing a cascade of a unitary transformation and differential pulse ... more Two hybrid coding systems utilizing a cascade of a unitary transformation and differential pulse code modulators (DPCM) systems are proposed. Both systems encode the transformed data by a bank of DPCM systems. The first system uses a one-dimensional transform of the data where the second one employs two-dimensional transformations. Theoretical results for Markov data and experimental results for a typical

IEEE Computer Society Annual Symposium on Emerging VLSI Technologies and Architectures (ISVLSI'06)

Accelerating simulation is one of the main reasons be-yond the introduction of system level model... more Accelerating simulation is one of the main reasons be-yond the introduction of system level modeling. Here Sys-temC is one of the main players proven to speed-up simula-tion in comparison to classical HDL languages. However, the kernel architecture of the SystemC simulator ...

Applications of Digital Image Processing III, 1979

In the Hybrid Coding technique, the sampled data is divided into blocks of NXM samples. Next, eac... more In the Hybrid Coding technique, the sampled data is divided into blocks of NXM samples. Next, each block is transformed to generate a one-dimensional transform of each line in the block. The transform coefficients are then processed by a block of DPCM encoders which uncorrelate the data in the second dimension and quantize the uncorrelated samples using appropriate quantizers. In this study an adaptive Hybrid Coding technique is proposed based on using a single quantizer (A/D Converter) to quantize the transform coefficients and using a variable-rate algorithm for coding the quantized coefficients. The accuracy of the A/D converter (number of bits per sample) determines the fidelity of the system. The buffer-control algorithm controls the accuracy of the A/D converter for each block resulting in a fixed-rate encoder system. Experimental results have shown a stable buffer condition and reconstructed images with a higher fidelity than nonadaptive Hybrid systems.

Design, Automation and Test in Europe

In this paper, we present a technique to design and verify the Look-Aside (LA-1) Interface standa... more In this paper, we present a technique to design and verify the Look-Aside (LA-1) Interface standard used in network processors. Our design flow includes several refinements starting from an informal UML specification until getting to an RTL modeled in Verilog. We integrate the verification of the LA-Interface in the design flow by considering two intermediate levels: (1) Abstract State Machines (ASM); and (2) SystemC. The first one serves the verification by model checking of a set of PSL properties, while the second includes a set of assertions to be verified by simulation. To evaluate the performance of our approach, we used the Rule-Base model checker to verify the same properties; and the OVL library to verify the same assertions.

2007 Internatonal Conference on Microelectronics, 2007

2006 Formal Methods in Computer Aided Design, 2006

The importance of re-usable Intellectual Properties (IPs) cores is increasing due to the growing ... more The importance of re-usable Intellectual Properties (IPs) cores is increasing due to the growing complexity of today's system-on-chip and the need for rapid prototyping. In this paper, we provide a design for verification approach of a PCI-X bus model, which is the fastest and latest extension of PCI technologies. We use two different modeling levels, namely UML and AsmL. We integrate the verification within the design phases where we use model checking and model based testing, respectively at the AsmL and SystemC levels. This case study presents an illustration of the integration of formal methods and simulations for the purpose of providing better verification results of SystemC IPs.

Combustion, Fire, 2006

... Please use this identifier to cite or link to this item: Record Details. Record ID, 345473. R... more ... Please use this identifier to cite or link to this item: Record Details. Record ID, 345473. Record Type, conference. Author, Ali Habibi [801001982594] - Ghent University; Bart Merci [801001144859] - Ghent University Bart.Merci@UGent.be; D ROEKAERTS. ...

SPE Journal, 2013

Summary Fines migration is a noticeable problem in petroleum-production engineering. Plugging of ... more Summary Fines migration is a noticeable problem in petroleum-production engineering. Plugging of throats in porous media occurs because of detachment of fine particles from sand surfaces. Thus, the study of interactions between fines and pore surfaces and the investigation of governing forces are important factors to consider when describing the mechanism of the fines-release process. The main types of these forces are electric double-layer repulsion (DLR) and London–van der Waals attraction (LVA). It may be possible to alter these forces with nanoparticles (NPs) as surface coatings. In comparison with repulsion forces, NPs increase the effect of attraction forces. In this paper, we present new experiments and simple modeling to observe such properties of NPs. For this purpose, the surfaces of pores were coated with different types of NPs: magnesium oxide (MgO), silicon dioxide (SiO2), and aluminum oxide (Al2O3). A zeta-potential test was used to examine changes in the potential of ...

Macromolecular Theory and Simulations, 2007

Macromolecular Theory and Simulations, 2004

Summary: The kinetics of solution free radical copolymerization of isobutyl methacrylate (i‐BMA) ... more Summary: The kinetics of solution free radical copolymerization of isobutyl methacrylate (i‐BMA) and lauryl methacrylate (LMA) in benzene, initiated with 2,2‐azoisobutyronitrile (AIBN) were studied at different monomer feed compositions at low conversion levels. In order to avoid the complications of copolymerization kinetics, the pseudo‐kinetic rate constant method was applied in constant and variable volume polymerization systems. A two‐step procedure based on interval analysis and the modified Rosenbrock method was used to estimate the kinetic parameters of copolymerization. In the first step, initiation, coupled propagation‐termination and transfer rate parameters were determined from steady state kinetic equations using interval analysis. Since the objective function is non‐linear, non‐convex and has multiple local optima, a robust computational technique, based on the Interval Newton/Generalized Bisection (IN/GB) algorithm, was developed to solve this set of non‐linear algebra...

Journal of Experimental Psychology: Learning, Memory, and Cognition, 1991

Locations nearby in space are typically experienced together in time: Spatial and temporal contig... more Locations nearby in space are typically experienced together in time: Spatial and temporal contiguity are confounded. In these experiments, subjects learned a map under controlled temporal order. In Experiment 1, one condition allowed the natural confound between space and time. Another condition did not; spatially near and far locations were temporally distant. A spatial priming effect was found in the former but not the latter condition. In Experiment 2, two groups learned a map in an unconfounded condition. For one group, temporal proximity in the learning order was held constant and distant, as in Experiment 1. For the other group, temporal proximity was held constant and close. Neither group showed a spatial priming effect. Experiment 3 replicated the unconfounded acquisition of Experiment 1, but tested for temporal priming, which was found. These results are difficult to reconcile with any theory of map representation that has metric properties that emerge independent of the temporal conditions of acquisition. A brief version of Experiment 1 was presented at the 30th annual meeting of the Psychonomic Society, Atlanta, November, 1989. We thank Tim McNamara for his helpful comments throughout the conduct of this research, for giving us access to his map material, and for his comments on earlier drafts. We also thank anonymous reviewers for their comments on an earlier draft, and Jacquelyn Joseph and Stacey Donegan for their help in conducting the research.

Journal of Circuits, Systems and Computers, 2007

In this paper, we propose to integrate an embedding of Property Specification Language (PSL) in S... more In this paper, we propose to integrate an embedding of Property Specification Language (PSL) in State Machines Language (AsmL) with a top–down design for verification approach in order to enable the model checking of large systems at the early stages of the design process. We provide a complete embedding of PSL in the ASM language AsmL, which allows us to integrate PSL properties as a part of the design. For verification, we propose a technique based on the AsmL tool that translates the code containing both the design and the properties into a finite state machine (FSM) representation. We use the generated FSM to run model checking on an external tool, here SMV. Our approach takes advantage of the AsmL language capabilities to model designs at the system level as well as from the power of the AsmL tool in generating both C# code and FSMs from AsmL models. We applied our approach on the PCI-X bus standard, which AsmL model was constructed from the informal standard specifications and...