farid Ahmed - Academia.edu (original) (raw)

Papers by farid Ahmed

Optical Engineering, 2004

We propose a correlation-based digital watermarking technique for robust image pattern authentica... more We propose a correlation-based digital watermarking technique for robust image pattern authentication. We hide a phase-based signature of the image back into its Fourier magnitude spectrum in the embedding stage. The detector computes the Fourier transform of the watermarked image and extracts the embedded signature. Authentication performance is measured by a correlation test of the extracted signature and the signature computed from the watermarked image. The quality of the watermarked image is obtained from the peak signal-tonoise ratio metric. We also furnish simulation results to show the robustness of our approach to typical image processing as found in JPEG compression.

International Review of Business Research Papers, 2015

While there is an increasing number of companies realising the potential that the diverse ethnic ... more While there is an increasing number of companies realising the potential that the diverse ethnic markets in Australia possess, majority still do not see the potential. Ethnic marketing in Australia is still in a developmental stage. Looking from the practitioner’s perspective, this paper reveals the ethnic marketing potential in Australia. Marketers face an exciting challenge in reaching a multi-ethnic Australia with huge potential returns. If perceptively practised, ethnic marketing could develop new approaches that respect Australia's diversities while celebrating their similarities. The market potential of the diverse ethnic markets in Australia is simply too big to be ignored. As more marketers see the potential of ethnic marketing and gradually gain experience and confidence in pursuing this alternative to mainstreaming marketing, it is envisaged that ethnic marketing would become an integral part of any marketing campaign in the long run

Journal of Micro and Nano-Manufacturing, 2014

The method of ultrashort pulse filamentation induced refractive index modification is employed to... more The method of ultrashort pulse filamentation induced refractive index modification is employed to inscribe fiber Bragg grating (FBG) in single-mode optical fiber (SMF). Line-by-line index inscription technique is used to write refractive index modulation in the core of SMF. The proposed pulse filamentation based index modification enables controlled and flexible writing of FBGs in optical fibers. Performance analysis of the fabricated FBG has been carried out for temperature, contact force, pressure, and axial strain sensing. The in-fiber FBG exhibits sensing performance very similar to FBGs commercially available to date. Then, the written FBG is engineered to demonstrate highly sensitive contact force sensor.

SPIE Proceedings, 2013

ABSTRACT This work reports femtosecond laser based fabrication of long period fiber gratings (LPF... more ABSTRACT This work reports femtosecond laser based fabrication of long period fiber gratings (LPFG). Index modulation in the core of single mode fiber (SMF) is written employing femtosecond pulse filamentation technique. Highly repeatable filamentary voids written in line-by-line femtosecond laser inscription technique enables steady and noise free growth of LPFGs. The sharp transmission valley (with a narrow full width at half maximum of 5 nm) of long period grating offers better resolution for refractive index (RI) measurement of a solution. The LPFGs inscribed by femtosecond laser radiation show RI sensing sensitivity of 29.199 nm/RIU which is three times higher than the sensitivity of LPFGs written by UV radiation (sensitivity: 11.179 nm/RIU). The position of transmission dip of a grating can be tailored relatively easily simply by varying the period of index modulation. © (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

SPIE Proceedings, 2004

Steganographic and watermarking information inserted into a color image file, regardless of embed... more Steganographic and watermarking information inserted into a color image file, regardless of embedding algorithm, causes disturbances in the relationships between neighboring pixels. A method for steganalysis utilizing the local binary pattern (LBP) texture operator to examine the pixel texture patterns within neighborhoods across the color planes is presented. Providing the outputs of this simple algorithm to an artificial neural net capable of supervised learning results in the creation of a surprisingly reliable predictor of steganographic content, even with relatively small amounts of embedded data. Other tools for identifying images with steganographic content have been developed by forming a neural network input vector comprised of image statistics that respond to particular side effects of specific embedding algorithms. The neural net in our experiment is trained with general texture related statistics from clean images and images modified using only one embedding algorithm, and is able to correctly discriminate clean images from images altered by data embedded by one of various different watermarking and steganographic algorithms. Algorithms tested include various steganographic and watermarking programs and include spatial and transform domain image hiding techniques. The interesting result is that clean color images can be reliably distinguished from steganographically altered images based on texture alone, regardless of the embedding algorithm.

Open Journal of Blood Diseases, 2012

The chronic myeloproliferative neoplasms (CMPN) are a group of clonal hematopoietic stem cell dis... more The chronic myeloproliferative neoplasms (CMPN) are a group of clonal hematopoietic stem cell disorders in which large numbers of red blood cells, white blood cells, or platelets grow and spread excess in the bone marrow and the peripheral blood. Cytogenetic analysis of the t(9;22) and molecular detection of BCR/ABL is the main diagnostic criteria in Philadelphia positive CMPN (CML). The identification of non-receptor tyrosine kinase JAK2 mutations (exon 14 JAK2 V617F and exon 12) have significantly contributed to our understanding of the molecular mechanisms in the pathogenesis of Philadelphia negative CMPN such as polycythemia vera (PV), essential thrombocythemia (ET) and primary myelofibrosis (PMF) patients. According to the revised WHO classification, JAK2 mutation is considered as a major diagnostic and clonal marker in Philadelphia negative CMPN which will play a major role in designing personalized treatments for the disease. JAK2 V617F mutation frequency is unknown in Saudi Arabia. Therefore, investigation of the JAK2 V617F mutation was carried out in DNA samples from 78 peripheral blood specimens corresponding to patients with polycythemia vera (PV) (n = 11), Chronic myeloid leukemia (CML) (n = 45), essential thrombocythemia (ET) (n = 10), idiopathic myelofibrosis (MF) (n = 12). We used polymerase chain reaction and direct DNA sequencing to detect the JAK2 mutation. Overall, the incidence of the JAK2 V617F mutation was 91% in PV, 40% in ET, and 25% in MF. This approach proved to be reliable and more sensitive in detecting the mutation. Two essential findings arose from our study. First, this technique could be carried out with DNA samples, even partially degraded, from routinely processed BM or peripheral blood specimens. Second, after correlation with morphological features, it turned out that the characteristics of the megakaryocytes were more specific than the mutational status of JAK2 in characterizing ET and PMF. Concerning PV, as expected, the incidence of the JAK2 mutation was higher, but the morphological criteria were misleading in some cases, strongly suggesting that the combination of both morphology and molecular data would enable the characterization of virtually all cases. JAK2 V617F mutation frequency along with accurate morphological characterization is very reliable tool in diagnosing and classifying CMPN in Saudi patients.

Optical Pattern Recognition VI, 1995

Wavelet based Joint transform correlator (JTC) for rotation invariant automatic target detection ... more Wavelet based Joint transform correlator (JTC) for rotation invariant automatic target detection is proposed in this paper. Wavelet features of a set of rotationally distorted training images are first extracted at different levels of resolution. A simple composite filter formulation is then employed to construct the reference image of the JTC. Simulation results are presented showing the improved rotation-invariant detection performance of the proposed technique.

Materials Sciences and Applications, 2014

Palm fiber (PF) reinforced acrylonitrile butadiene styrene (ABS) composite matrix was prepared by... more Palm fiber (PF) reinforced acrylonitrile butadiene styrene (ABS) composite matrix was prepared by employing Injection Moulding Machine (IMM). Palm fiber was collected from ten different trees of different age group from Comilla region in Bangladesh. Three sets of samples were prepared for three different wt% (5%, 10% and 20%) of fiber contents. The mechanical (tensile strength, flexural stress, micro hardness, Leeb's rebound hardness) and physical (bulk density and water absorption) properties were measured. The observed result reveals that the tensile strength (TS) and flexural stress (FS) were decreased with increasing fiber contents in the PF-ABS composites except 10% fiber content.

CNS & Neurological Disorders - Drug Targets, 2014

Journal of Current and Advance Medical Research, 2014

Chikungunya is an arthropod borne viral disease considered as the new emerging infectious disease... more Chikungunya is an arthropod borne viral disease considered as the new emerging infectious disease in many countries of Asia, Africa, Europe and America. In this present case report a 45 year old lady was presented with multiple joint pains following exanthematous febrile illness. Laboratory result revealed this case as positive for chikungunya.DOI: http://dx.doi.org/10.3329/jcamr.v1i1.19562J Curr Adv Med Res 2014;1(1):21-22

Optical Pattern Recognition VII, 1996

Optics and Lasers in Engineering, 1998

ABS¹RAC¹ A synthetic joint Fourier transform (SJF¹) correlator is proposed for the realization of... more ABS¹RAC¹ A synthetic joint Fourier transform (SJF¹) correlator is proposed for the realization of generalized logic problems. As a case study, a multi-channel SJF¹ correlator is employed to realize a multi-output logic unit. For a given correlator setup , this particular scheme ensures the maximal utilization of space bandwidth product. ¹his work establishes a pragmatic approach for implementing real-time programmable content addressable memory for information processing.

Optical Engineering, 1996

An amplitude-coupled minimum-average correlation energy algorithm is implemented and tested for a... more An amplitude-coupled minimum-average correlation energy algorithm is implemented and tested for a rotation invariance feature. The algorithm is tested on synthetic aperture radar images for probability of correct classification.

Neuropharmacology, 2005

Thyrotropin-releasing hormone (TRH) and TRH analogues have been reported to be neuroprotective in... more Thyrotropin-releasing hormone (TRH) and TRH analogues have been reported to be neuroprotective in experimental models of spinal cord injury and head injury. We have previously shown that a diketopiperazine structurally related to the TRH metabolite cyclo-his-pro reduces neuronal cell death in vitro and in vivo. Here we report the neuroprotective activity of other cyclic dipeptides in multiple in vitro models of neuronal injury and after controlled cortical impact (CCI) in mice. Using primary neuronal cultures, three novel dipeptides were compared to the previously reported diketopiperazine as well as to vehicle controls; each of the compounds reduced cell death after direct physical trauma or trophic withdrawal. Two of these peptides also protected against glutamate toxicity and beta-amyloid-induced injury; the latter also strongly inhibited glutamate-induced increases in intracellular calcium. Treatment with each of the test compounds resulted in highly significant improvement of motor and cognitive recovery after CCI, as well as markedly reducing lesion volumes as shown by high field magnetic resonance imaging. DNA microarray studies following fluid percussion induced traumatic brain injury (TBI) in rats showed that treatment with one of these dipeptides after injury significantly down-regulated expression of mRNAs for cell cycle proteins, aquaporins, cathepsins and calpain in ipsilateral cortex and/or hippocampus, while up-regulating expression of brain-derived neurotrophic factor, hypoxia-inducible factor and several heat-shock proteins. Many of these mRNA expression changes were paralleled at the protein level. The fact that these small peptides modulate multiple mechanisms favoring neuronal cell survival, as well as their ability to improve functional outcome and reduce posttraumatic lesion size, suggests that they may have potential utility in clinical head injury.

Journal of Electronic Imaging, 1999

In this paper, we formulate a complete approach of line matching, based on geometrical invariants... more In this paper, we formulate a complete approach of line matching, based on geometrical invariants. In the proposed technique, it is not necessary to have a priori knowledge about the observed objects and the camera calibration coefficients. This technique can be used in on-line tasks in robotics, tracking, and target recognition applications. A line segment is locally represented by invariant

Journal of Cerebral Blood Flow & Metabolism, 2004

Endocannabinoids, including 2-arachidonoylglycerol and anandamide ( N-arachidonoylethanolamine; A... more Endocannabinoids, including 2-arachidonoylglycerol and anandamide ( N-arachidonoylethanolamine; AEA), have neuroprotective effects in the brain through actions at CB1 receptors. However, AEA also binds to vanilloid (VR1) receptors and induces cell death in several cell lines. Here we show that anandamide causes neuronal cell death in vitro and exacerbates cell loss caused by stretch-induced axonal injury or trophic withdrawal in rat primary neuronal cultures. Administered intracerebroventricularly, AEA causes sustained cerebral edema, as reflected by diffusion-weighted magnetic resonance imaging, regional cell loss, and impairment in long-term cognitive function. These effects are mediated, in part, through VR1 as well as through calpain-dependent mechanisms, but not through CB1 receptors or caspases. Central administration of AEA also significantly upregulates genes involved in proinflammatory/microglial-related responses. Thus, anandamide produces neurotoxic effects both in vitro ...

Journal of neurotrauma, 2011

The overlapping pathologies and functional outcomes of blast-induced TBI (bTBI) and stress-relate... more The overlapping pathologies and functional outcomes of blast-induced TBI (bTBI) and stress-related neurobehavioral disorders like post-traumatic stress disorder (PTSD) are significant military health issues. Soldiers are exposed to multiple stressors with or without suffering bTBI, making diagnosis and treatment as well as experimental modeling of bTBI a challenge. In this study we compared anxiety levels of Naïve rats to ones that were exposed to each of the following conditions daily for 4 consecutive days: C I: transportation alone; C II: transportation and anesthesia; C III: transportation, anesthesia, and blast sounds; Injured: all three variables plus mild blast overpressure. Following behavioral testing we analyzed sera and select brain regions for protein markers and cellular changes. C I, C II, and C III animals exhibited increased anxiety, but serum corticosterone levels were only significantly elevated in C III and Injured rats. C III and Injured animals also had elevated...

International Journal of Surgery, 2012

Conclusions: Our study has shown that patients who present with thickening or lumpiness of the br... more Conclusions: Our study has shown that patients who present with thickening or lumpiness of the breast should all have FNAC or core biopsy of the symptomatic area, even in the presence of normal USS and/or mammography. This highlight's the importance of a thorough triple assessment in all patients presenting to the breast clinic.