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Search Results: 1 - 7 of 7 matches for " Iorliam Aamo "
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On the Use of Benford’s Law to Detect JPEG Biometric Data Tampering  [PDF]
Iorliam Aamo, Shangbum F. Caleb
Journal of Information Security (JIS) , 2017, DOI: 10.4236/jis.2017.83016
Abstract: Tampering of biometric data has attracted a great deal of attention recently. Furthermore, there could be an intentional or accidental use of a particular biometric sample instead of another for a particular application. Therefore, there exists a need to propose a method to detect data tampering, as well as differentiate biometric samples in cases of intentional or accidental use for a different application. In this paper, fingerprint image tampering is studied. Furthermore, optically acquired fingerprints, synthetically generated fingerprints and contact-less acquired fingerprints are studied for separation purposes using the Benford’s law divergence metric. Benford’s law has shown in literature to be very effective in detecting tampering of natural images. In this paper, the Benford’s law features with support vector machine are proposed for the detection of malicious tampering of JPEG fingerprint images. This method is aimed at protecting against insider attackers and hackers. This proposed method detected tampering effectively, with Equal Error Rate (EER) of 2.08%. Again, the experimental results illustrate that, optically acquired fingerprints, synthetically generated fingerprints and contact-less acquired fingerprints can be separated by the proposed method effectively.
Airtime Credit Banking: From Two Applications to One Application  [PDF]
Iorliam Aamo, Atu Myom, Yahaya I. Shehu
Journal of Computer and Communications (JCC) , 2017, DOI: 10.4236/jcc.2017.510002
Abstract: This paper proposes how airtime credit could be used for banking purposes. The aim is to provide a means of converting airtime credit of any network service provider to a credit alert for a particular bank account user. This paper shows a simple implementation of the proposed system. The advantage of the proposed system is that it allows customers the right to convert their purchased airtime credit to a credit alert at anytime when they no longer wish to use the airtime credit again. Furthermore, it explains the limitations of the proposed system considering regulations in different countries of deployment. This approach could be extended to cover other vouchers for banking applications as well.
Tutorial on Feedback Control of Flows, Part II: Diagnostics and Feedback Control of Mixing
Ole M. Aamo,Thor I. Fossen
Modeling, Identification and Control , 2002, DOI: 10.4173/mic.2002.4.3
Abstract: Control of fluid flows span a wide variety of specialities. In Part II of this tutorial, we focus on diagnostics of mixing and the problem of enhancing mixing by boundary feedback control. Diagnostic tools from dynamical systems theory are presented that enable detection and quantification of chaotic transport in periodically perturbed systems. However, real systems are generally not periodic, and available measurements or simulations are finite in time. A method for quantifying mixing in finite-time velocity fields is discussed, and applied to data obtained from simulations of the 2D controlled channel flow. Mixing has traditionally been brought on by open-loop control strategies, such as stirring, jet injection or mixing valves. Applications of active feedback to mixing problems are scarce in the literature, but the idea is currently drawing attention from various research groups. Feedback laws for the purpose of mixing enhancement in 2D and 3D pipe flow are presented, and simulations show that they induce strong mixing.
Tutorial on Feedback Control of Flows, Part I: Stabilization of Fluid Flows in Channels and Pipes
Ole M. Aamo,Thor I. Fossen
Modeling, Identification and Control , 2002, DOI: 10.4173/mic.2002.3.1
Abstract: The field of flow control has picked up pace over the past decade or so, on the promise of real-time distributed control on turbulent scales being realizable in the near future. This promise is due to the micromachining technology that emerged in the 1980s and developed at an amazing speed through the 1990s. In lab experiments, so called micro-electro-mechanical systems (MEMS) that incorporate the entire detection-decision-actuation process on a single chip, have been batch processed in large numbers and assembled into flexible skins for gluing onto body-fluid interfaces for drag reduction purposes. Control of fluid flows span a wide variety of specialities. In Part I of this tutorial, we focus on the problem of reducing drag in channel and pipe flows by stabilizing the parabolic equilibrium profile using boundary feedback control. The control strategics used for this problem include classical control, based on the Nyquist criteria, and various optimal control techniques (H2, H-Infinity), as well as applications of Lyapunov stability theory.
Effect of Palmyra Palm Leaf Ash on Cement Stabilization of Makurdi Shale
Amos Yala IORLIAM,Isaac Olufemi AGBEDE,Tersugh JEIYOL
Leonardo Electronic Journal of Practices and Technologies , 2012,
Abstract: Makurdi Shale was treated with palmyra palm leaf ash (PPLA) and cement to assess its suitability as a material in construction of flexible pavement. Classification, Compaction, Consistency, California bearing ratio (CBR) and Unconfined compressive strength (UCS) tests, were conducted on the shale specimen treated with, cement and PPLA in a combined incremental order of 2% up to 10% of cement and 2% up to 14% of PPLA of dry weight of soil sample respectively. Results of tests showed that Makurdi shale is an A-7-6, high plasticity (CH) and high swell potential soil by the American Association of State Highway and Transportation Officials (AASHTO), Unified Soil Classification System (USCS) and Nigerian Building and Road Research Institute (NBRRI) classification systems respectively. The plasticity index (PI) reduced from 30.5% for untreated Makurdi shale to 4% at 10% cement +14% PPLA contents. The maximum soaked CBR and 7 day UCS values of 92% and 1041 kN/m2 were obtained at 10% cement+14 % PPLA contents respectively. From the results, Makurdi shale treated with a combination of 10%cement+14% PPFA with a soaked CBR value of 92 %, 7 day UCS value of 1041 kN/m2 and 82 % value of resistance to loss in strength, satisfied the requirement for sub-base specification. It is therefore recommended for use as sub-base materials in flexible pavement.
Nonlinear Model-Based Control of Unstable Wells
Glenn-Ole Kaasa,Vidar Alstad,Jing Zhou,Ole M. Aamo
Modeling, Identification and Control , 2007, DOI: 10.4173/mic.2007.3.2
Abstract: This paper illustrates the potential of nonlinear model-based control applied for stabilization of unstable flow in oil wells. A simple empirical model is developed that describes the qualitative behavior of the downhole pressure during severe riser slugging. A nonlinear controller is designed by an integrator backstepping approach, and stabilization for open-loop unstable pressure setpoints is demonstrated. The proposed backstepping controller is shown in simulations to perform better than PI and PD controllers for low pressure setpoints, and is in addition easier to tune. Operation at a low pressure setpoint is desirable since it corresponds to a high production flow rate. The simulation results are presented to illustrate the effectiveness of proposed control scheme.
Observer Design for Multiphase Flow in Vertical Pipes with Gas Lift - Theory and Experiments
Ole M. Aamo,G.O. Eikrem,H.B. Siahaan,Bjarne A. Foss
Modeling, Identification and Control , 2005, DOI: 10.4173/mic.2005.2.1
Abstract: Unstable regimes occurring for multiphase flow in vertical risers have successfully been stabilized using conventional linear control techniques. However, these control systems rely on downhole measurements which are at best unreliable, if at available. In this paper, we design a nonlinear observer for the states of the multiphase flow that relies on topside measurements only, and apply it to estimate downhole pressure for feedback control. A key feature of the design is that it exploits the structure of the model to obtain robustness with respect to the internal flows in the system. Combining the nonlinear observer with conventional PI control of the downhole pressure, we demonstrate in laboratory experiments the potential for increasing production from gas-lift wells by stabilizing the multiphase flow.
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