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Towards Biorefinery Production of Microalgal Biofuels and Bioproducts: Production of Acetic Acid from the Fermentation of <i>Chlorella</i>sp. and <i>Tetraselmis suecica</i>Hydrolysates

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Green and Sustainable Chemistry 2017年第2期7卷 152-171页

作者： mohd Asyraf Kassim mohd aziz rashid Ronald Halim Bioprocess Technology Divisions School of Industrial Technology Universiti Sains Malaysia Pulau Pinang Malaysia Department of Chemical Engineering Monash University Victoria Australia Crop and Soil Science Research Centre (SS) Malaysian Agriculture Research and Development Institute (MARDI) Serdang Malaysia Department of Chemical and Biomolecular Engineering The University of Melbourne Victoria Australia

Successful commercialization of microalgal bio-industry requires the design of an integrated microalgal biorefinery system that facilitates the co-production of biofuels, high-value products and industrial chemicals from the biomass. In this study, we investigated the use of sugar hydrolysate obtained from enzymatic saccharification of microalgal biomass (Chlorella sp. and T. suecica) as fermentation feedstock to produce industrially important chemicals, in particular acetic acid and butyric acid. By using hydrolysate with low sugar content as substrate for the anaerobic fermentation (1.5 - 2.4 g/L), we were able to prevent the bacterium C. saccharoperbutylacetonicum from activating its solventogenesis pathway. As a result, the fermentation process generated a product stream that was dominated by organic acids (acetic acid and butyric acid) rather than solvents (butanol, ethanol and acetone). Acetic acid constituted up to 92 wt% of Chlorella’s fermentation products and 80 wt% of T. suecica’s fermentation products. For T. suecica, the fermentation consumed almost all of the sugar available in the hydrolysate (up to 92% of initial sugar) and produced a reasonable yield of fermentation products (0.08 g fermentation products/g sugar). The Gompertz equation was successfully used to predict the formation kinetics of acetic acid and other fermentation products across both species. The results in the study demonstrate the production of industrially important chemicals, such as acetic acid and butyric acid, from the fermentation of microalgal sugar. The process described in the study can potentially be used as a value-adding step to generate biochemicals from cell debris in an integrated microalgal biorefinery system.

关键词： Microalgal Cultivation Acetone-Butanol-Ethanol Fermentation Acetic Acid Microalgal Biorefinery Gompertz Model Biochemical Biofuels

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Blade Wrap Angle Impact on Centrifugal Pump Performance:Entropy Generation and Fluid-Structure Interaction Analysis

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 109-137页

作者： Hayder Kareem Sakran mohd Sharizal Abdul aziz Chu Yee Khor School of Mechanical Engineering Universiti Sains MalaysiaEngineering CampusNibong TebalPenang14300Malaysia Chemical Engineering Department Faculty of EngineeringAl-Muthanna UniversityMuthanna66001Iraq Faculty of Mechanical Engineering&Technology Universiti Malaysia Perlis(UniMAP)ArauPerlis02600Malaysia

The centrifugal pump is a prevalent power equipment widely used in different engineering patterns,and the impeller blade wrap angle significantly impacts its performance.A numerical investigation was conducted to analyze the influence of the blade wrap angle on flow characteristics and energy distribution of a centrifugal pump evaluated as a low specific speed with a value of *** study investigates six impellermodels that possess varying blade wrap angles(95°,105°,115°,125°,135°,and 145°)that were created while maintaining the same volute and other geometrical *** investigation of energy loss was conducted to evaluate the values of total and entropy generation rates(TEG,EGR).The fluid-structure interaction was considered numerically using the software tools ANSYS Fluent and *** elastic structural dynamic equation was used to estimate the structural response,while the shear stress transport k–ωturbulence model was utilized for the fluid domain *** findings suggest that the blade wrap angle has a significant influence on the efficiency of the *** impeller featuring a blade wrap angle of 145°exhibits higher efficiency,with a notable increase of 3.76%relative to the original *** in the blade wrap angle impact the energy loss,shaft power,and pump *** model with a 145°angle exhibited a maximum equivalent stress of 14.8MPa and a total deformation of 0.084 *** results provide valuable insights into the intricate flow mechanism of the centrifugal pump,particularly when considering various blade wrap angles.

关键词： Centrifugal pump blade wrap angle entropy generation theory fluid-structure interaction hydraulic performance

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Occurrence of K1 and K2 serotypes and genotypic characteristics of extended spectrumβ-lactamases-producing Klebsiella pneumoniae isolated from selected hospitals in Malaysia

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Asian Pacific Journal of Tropical Medicine 2024年第1期17卷 30-38页

作者： Nurul Syazrah Anuar Hazmin Hazman Sharven Raj Jeyakumar mohd Nasir mohd Desa Hasni Idayu Saidi Siti Norbaya Masri Nur Afiza aziz Nurshahira Sulaiman Department of Biomedical Science Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400UPM SerdangSelangorMalaysia Department of Medical Microbiology Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400UPM SerdangSelangorMalaysia Microbiology Unit Department of PathologyHospital Sultanah AminahJalan Persiaran Sultan Abu Bakar80100 Johor BahruJohorMalaysia

Objective:To determine the distribution,phenotypic and genetic background of extended spectrumβ-lactamases(ESBL)-producing Klebsiella(K.)pneumoniae clinical isolates associated with K1 and K2 serotypes in two selected hospitals in ***:A total of 192 *** isolates were collected and subjected to antibiotic susceptibility,hypermucoviscosity test and multiplex PCR to detect the presence of K1-and K2-serotype associated *** sequence typing(MLST)was performed on ESBL-producing *** isolates presented with K1 and K2 serotypes,followed by phylogenetic ***:A total of 87 out of 192(45.3%)of the *** isolates collected were ESBL ***,only 8.3%(16/192)and 10.9%(21/192)of the total isolates were detected to carry K1-and K2-serotype associated genes,*** analysis showed that K1 and K2 capsular serotypes were not significantly associated with ESBL phenotype(P=0.196).However,they were significantly associated with hypervirulent,as demonstrated by the positive string test(P<0.001).MLST analysis revealed that ST23 as the predominant sequence type(ST)in the K1 serotype,while the ST in the K2 serotype is more ***:Although the occurrence of ESBL-producing isolates among the hypervirulent strains was low,their coexistence warrants the need for continuous *** showed that these isolates were genetically heterogeneous.

关键词： Extended spectrumβ-lactamases Klebsiella pneumoniae Capsular serotypes Genotypic

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Comparison of resistive index and shear-wave elastography in the evaluation of chronic kidney allograft dysfunction

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World Journal of Transplantation 2024年第1期14卷 154-163页

作者： Ameet Kumar Jesrani Syed M Faiq Rahma rashid Tariq Ali Kalwar Rehan Mohsin Tahir aziz Nida Amin Khan Muhammed Mubarak Department of Radiology Sindh Institute of Urology and TransplantationKarachi 74200SindhPakistan Department of Pathology Sindh Institute of Urology and TransplantationKarachi 74200SindhPakistan Department of Transplantation Sindh Institute of Urology and TransplantationKarachi 74200SindhPakistan Department of Urology Sindh Institute of Urology and TransplantationKarachi 74200SindhPakistan

BACKGROUND Detection of early chronic changes in the kidney allograft is important for timely intervention and long-term *** and novel ultrasound-based investigations are being increasingly used for this purpose with variable *** To compare the diagnostic performance of resistive index(RI)and shear wave elastography(SWE)in the diagnosis of chronic fibrosing changes of kidney allograft with histopathological *** This is a cross-sectional and comparative study.A total of 154 kidney transplant recipients were included in this study,which was conducted at the Departments of Transplantation and Radiology,Sindh Institute of Urology and Transplantation,Karachi,Pakistan,from August 2022 to February *** consecutive patients with increased serum creatinine levels and reduced glomerular filtration rate(GFR)after three months of transplantation were enrolled in this *** and RI were performed and the findings of these were evaluated against the kidney allograft biopsy results to determine their diagnostic *** The mean age of all patients was 35.32±11.08 *** these,126(81.8%)were males and 28(18.2%)were *** mean serum creatinine in all patients was 2.86±1.68 mg/dL and the mean estimated GFR was 35.38±17.27 mL/min/1.73 *** allograft biopsy results showed chronic changes in 55(37.66%)*** sensitivity,specificity,positive predictive value(PPV),and negative predictive value(NPV)of SWE for the detection of chronic allograft damage were 93.10%,96.87%%,94.73%,and 95.87%,respectively,and the diagnostic accuracy was 95.45%.For RI,the sensitivity,specificity,PPV,and NPV were 76.92%,83.33%,70.17%,and 87.62%,respectively,and the diagnostic accuracy was 81.16%.CONCLUSION The results from this study show that SWE is more sensitive and specific as compared to RI in the evaluation of chronic allograft *** can be of great help during the routine follow-up of kidney transplant recipients for screening a

关键词： Shear wave Sonoelastography Resistive index Chronic allograft changes Biopsy Histopathology

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Epidemiological observations of invasive group B Streptococcus infections in six major hospitals in Peninsular Malaysia

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Asian Pacific Journal of Tropical Medicine 2024年第9期17卷 384-391页

作者： AbdulRahman Muthanna mohd Nasir mohd Desa Nurul Asyikin Abdul Rahman Nurul Diana Dzaraly Nurul Hana Zainal Baharin Nur Afiza aziz Chua Hui Shan Zalina Ismail Lailatul Akmar Mat Nor Marlindawati mohd Ali Nur Hanani Ahmad Mohammad Noor Amal Azmai Syafinaz Amin-Nordin Department of Biomedical Sciences Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400 SerdangSelangorMalaysia School of Biology Faculty of Applied SciencesUniversiti Teknologi MARANegeri Sembilan72000 Kuala PilahMalaysia Department of Oral Biology&Biomedical Sciences Faculty of DentistryMAHSA University42610 JenjaromSelangorMalaysia School of Bioscience Faculty of Pharmacy and Biomedical SciencesMAHSA University42610 JenjaromSelangorMalaysia Department of Pathology Sultanah Aminah Hospital80100 Johor BahruJohorMalaysia Department of Pathology Melaka General Hospital75400 MelakaMalaysia Department of Medical Microbiology and Immunology Faculty of MedicineUniversiti Kebangsaan Malaysia56000 CherasKuala LumpurMalaysia Department of Pathology Sultan Idris Shah Serdang Hospital43000 KajangSelangorMalaysia Department of Pathology Tuanku Ja'afar Hospital70300 SerembanNegeri SembilanMalaysia Department of Pathology Sungai Buloh Hospital47000 Sungai BulohSelangorMalaysia Department of Biology Faculty of ScienceUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Aquatic Animal Health and Therapeutics Laboratory Institute of BioscienceUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Medical Microbiology Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Medical Microbiology Sultan Abdul Aziz Shah HospitalUniversiti Putra MalaysiaPersiaran MARDI-UPM43400SelangorMalaysia

Objective:To address the lack of research on invasive group B Streptococcus(GBS)infections in Malaysia and Southeast Asia through a comprehensive analysis of GBS isolates obtained from ***:Medical records from patients with GBS infection isolated from the sterile site,such as blood and cerebrospinal fluid from 14 July 2019 to 15 December 2020,were reviewed from six major hospitals in Peninsular *** criteria were invasive GBS,sterile sites and non-repeated GBS isolated from the same patients in the same *** isolates were re-identified for GBS and ***:A total of 118 patients were eligible,with a majority of non-pregnant adults(76.3%).Over half of the patients(62.7%)had underlying medical conditions,with diabetes as the most common disease,followed by respiratory disease,renal disease,cardiovascular disease and skin and soft tissue *** most common manifestations were sepsis,followed by soft tissue abscess,diabetic foot ulcer,wet gangrene and *** overall mortality was 7.6%.The most common serotype was serotype桋.Conclusions:Invasive GBS infection among non-pregnant adults showed a rising trend,particularly among diabetic *** study underscores the importance of reducing risk factors and highlights the necessity of developing GBS vaccination as a preventive strategy for both infants and adults.

关键词： Streptococcus agalactiae Group B Streptococcus Invasive GBS infections Malaysia

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National guidelines for the diagnosis and treatment of hilar cholangiocarcinoma

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World Journal of Gastroenterology 2024年第9期30卷 1018-1042页

作者： Faisal Saud Dar Zaigham Abbas Irfan Ahmed Muhammad Atique Usman Iqbal Aujla Muhammad Azeemuddin Zeba aziz Abu Bakar Hafeez Bhatti Tariq Ali Bangash Amna Subhan Butt Osama Tariq Butt Abdul Wahab Dogar Javed Iqbal Farooqi Faisal Hanif Jahanzaib Haider Siraj Haider Syed Mujahid Hassan Adnan Abdul Jabbar Aman Nawaz Khan Muhammad Shoaib Khan Muhammad Yasir Khan Amer Latif Nasir Hassan Luck Ahmad Karim Malik Kamran rashid Sohail rashid Mohammad Salih Abdullah Saeed Amjad Salamat Ghias-un-Nabi Tayyab Aasim Yusuf Haseeb Haider Zia Ammara Naveed Department of Hepatopancreatic Biliary Surgery&Liver Transplant Pakistan Kidney and Liver Institute&Research CentreLahore 54000Pakistan Department of Hepatogastroenterology and Liver Transplantation Dr.Ziauddin University HospitalKarachi 75600SindhPakistan University of Aberdeen Aberdeen B243FXUnited Kingdom Department of Pathology Pakistan Kidney and Liver Institute&Research CentreLahore 54000Pakistan Department of Gastroenterology&Hepatology Pakistan Kidney and Liver Institute&Research CentreLahore 54000Pakistan Department of Radiology Aga Khan UniversityKarachi 74800Pakistan Department of Oncology Hameed Latif HospitalLahore 54000Pakistan Division of Hepatopancreatic Biliary Surgery&Liver Transplantation Shifa International HospitalIslamabad 44000Pakistan Department of Hepatopancreatic Biliary Surgery&Liver Transplant Shaikh Zayed Hospital and Post Graduate Medical InstituteLahore 54000Pakistan Department of Medicine Aga Khan University HospitalKarachi 74800Pakistan Department of Liver Transplant Pir Abdul Qadir Shah Jeelani Institute of Medical SciencesGambat 66020Pakistan Department of Medicine&Gastroenterology Lifecare Hospital and Research CentrePeshawar 25000Khyber PakhtunkhwaPakistan Department of Hepatopancreatobiliary&Liver Transplant Bahria International HospitalLahore 54000Pakistan Department of Surgery Hepatopancreatobiliary&Liver TransplantDow University of Health SciencesKarachi 74800Pakistan Department of Gastroenterology Hepatology&NutritionPir Abdul Qadir Shah Jeelani Institute of Medical SciencesGambat 66020Pakistan Department of Oncology Dr.Ziauddin HospitalKarachi 74800Pakistan Department of Radiology Rehman Medical InstitutePeshawar 25000Pakistan Army Liver Transplant Unit Pak Emirates Military HospitalRawalpindi 46000Pakistan Department of Gastroenterology Sindh Institute of Urology and TransplantationKarachi 75500Pakistan rashid Nursing Home and Cancer Clinic Rashid Nursing Home and Cancer ClinicRawalpindi 46000Pakistan Department of Gastroentero

A consensus meeting of national experts from all major national hepatobiliary centres in the country was held on May 26,2023,at the Pakistan Kidney and Liver Institute&Research Centre(PKLI&RC)after initial consultations with the *** Pakistan Society for the Study of Liver Diseases(PSSLD)and PKLI&RC jointly organised this *** effort was based on a comprehensive literature review to establish national practice guidelines for hilar cholangiocarcinoma(hCCA).The consensus was that hCCA is a complex disease and requires a multidisciplinary team approach to best manage these *** coordinated effort can minimise delays and give patients a chance for curative treatment and effective *** diagnostic and staging workup includes high-quality computed tomography,magnetic resonance imaging,and magnetic resonance *** cytology or biopsy utilizing endoscopic retrograde cholangiopancreatography is a mainstay for ***,histopathologic confirmation is not always required before *** ultrasound with fine needle aspiration of regional lymph nodes and positron emission tomography scan are valuable adjuncts for *** only curative treatment is the surgical resection of the biliary tree based on the Bismuth-Corlette *** patients with unresectable hCCA can be considered for liver *** chemotherapy should be offered to patients with a high risk of *** use of preoperative biliary drainage and the need for portal vein embolisation should be based on local multidisciplinary *** with acute cholangitis can be drained with endoscopic or percutaneous biliary *** chemotherapy with cisplatin and gemcitabine has shown improved survival in patients with irresectable and recurrent hCCA.

关键词： Hilar cholangiocarcinoma Bismuth-Corlette classification Memorial Sloan Kettering Cancer Centre Staging Preoperative biliary drainage Portal vein embolisation Surgical resection Hepatectomy

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Low-energy X-ray attenuation characteristics of Rhizophora ***

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Nuclear Science and Techniques 2021年第3期32卷 11-29页

作者： Damilola Oluwafemi Samson Ahmad Shukri mohd Zubir Mat Jafri Rokiah Hashim mohd Zahri Abdul aziz Sylvester Jande Gemanam mohd Fahmi mohd Yusof School of Physics Universiti Sains Malaysia11800 GelugorPenangMalaysia School of Industrial Technology Universiti Sains Malaysia11800 GelugorPenangMalaysia Advanced Medical and Dental Institute Universiti Sains Malaysia13200 BertamPenangMalaysia School of Health Sciences Universiti Sains Malaysia16150 Kota BharuKelantanMalaysia

Photon absorption parameters such as mass attenuation coefficients(μ_m),molar extinction coefficients(ε),total molecular(σ_(t,m)),atomic(σ_(t,a))and electronic(σ_(t,el))cross sections,half-value layers(X_(1/2)),tenth-value layers(X_(1/10)),mean free paths(λ),effective atomic numbers(Z_(eff)),and effective electron densities(N_(el))were estimated for defatted soy flour(DSF),soy protein concentrate(SPC),and soy protein isolate(SPI)-based Rhizophora *** composites substituted with 10 wt%sodium hydroxide(NaOH)and 0,5,10,and 15 wt%itaconic acid polyamidoamine-epichlorohydrin(IA-PAE)*** composition was assessed using ultrahigh-resolution field emission scanning electron microscopy-energy dispersive X-ray spectrometry(UHR-FESEM-EDX).The interaction parameters were evaluated for K_(α1)photons at16.59,17.46,21.21,and 25.26 keV,employing a low-energy germanium(LEGe)detector system and an~(241)Amγ-ray source.X-ray diffraction characterization revealed an amorphous phase in the developed particleboard *** DSF15',SPC15',and SPI15'exhibited the highest values ofμ_m,ε,σ_(t,m),Zeff,and N_(el)among all of the studied particleboard samples,within the range of measured photon *** addition,all of the modified samples exhibited lower X_(1/2),X_(1/10),λ,σ_(t,a),andσ_(t,el)than the unmodified samples,with DSF-,SPC-,and SPI/NaOH/Rhizophora spp./IA-PAE(15 wt%),indicating insignificant *** current results of the particleboard samples'analysis can be useful for medical radiation applications and shielding research.

关键词： Photon interaction parameters Shielding DSF–SPC–SPI Particleboards NaOH/IA-PAE

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Analytical and finite-element study of optimal strain distribution in various beam shapes for energy harvesting applications

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Acta Mechanica Sinica 2016年第4期32卷 670-683页

作者： B.L.Ooi J.M.Gilbert A.rashid A.aziz Faculty of Integrative Sciences and Technology Quest International University Perak (QIUP) Faculty of Science and Engineering School of EngineeringUniversity of Hull Center for Automotive Research and Electric Mobility(CAREM) Universiti Teknologi PETRONAS (UTP)

Owing to the increasing demand for harvesting energy from environmental vibration for use in self-powered electronic applications, cantilever-based vibration energy harvesting has attracted considerable interest from various parties and has become one of the most common approaches to converting redundant mechanical energy into electrical energy. As the output voltage produced from a piezoelectric material depends largely on the geometric shape and the size of the beam, there is a need to model and compare the performance of cantilever beams of differing *** paper presents the study of strain distribution in various shapes of cantilever beams, including a convex and concave edge profile elliptical beam that have not yet been discussed in any prior literature. Both analytical and finite-element models are derived and the resultant strain distributions in the beam are computed based on a MATLAB solver and ANSYS finite-element analysis tools. An optimum geometry for a vibration-based energy harvesting system is ***, experimental results comparing the power density for triangular and rectangular piezoelectric beams are also presented to validate the findings of the study, and the claim, as suggested in the literature, is verified.

关键词： harvesting triangular elliptical verified normalized piezoelectric cantilever redundant validate rectangular

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Risk modification of colorectal cancer susceptibility by interleukin-8-251T>A polymorphism in Malaysians

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World Journal of Gastroenterology 2012年第21期18卷 2668-2673页

作者： mohd Aminudin Mustapha Siti Nurfatimah mohd Shahpudin Ahmad Aizat Abdul aziz Ravindran Ankathil Human Genome Centre School of Medical Sciences Universiti Sains Malaysia Health CampusKubang KerianKelantan 16150 Malaysia

AIM: To investigate the allele and genotype frequencies and associated risk of interleukin (IL)-8-251T>A polymorphism on colorectal cancer (CRC) susceptibility risk. METHODS: Peripheral blood samples of 255 normal controls and 255 clinically and histopathologically confirmed CRC patients were genotyped for IL-8-251T>A polymorphism employing allele-specific polymerase chain reaction. The relative association of variant allele and genotypes with CRC susceptibility risk was determined by calculating the odds ratios (ORs). Corresponding χ 2 tests on the CRC patients and controls were carried out and 95% confidence intervals (CIs) were determined using Fisher's exact test. The allele frequencies and its risk association were calculated using FAMHAP, haplotype association analysis software. RESULTS: On comparing the frequencies of genotypesof patients and controls, the homozygous variant AA was significantly higher in CRC patients (P = 0.002) compared to controls. Investigation on the association of the polymorphic genotypes with CRC susceptibility risk, showed that the homozygous variant IL-8 -251AA had a significantly increased risk with OR 3.600 (95% CI: 1.550-8.481, P = 0.001). In the case of allele frequencies, variant allele A of IL-8 -251 showed a significantly increased risk of CRC predisposition with OR 1.32 (95% CI: 1.03-1.69,P = 0.003). CONCLUSION: Variant allele and genotype of IL-8 (-251 T>A) was significantly associated with CRC susceptibility risk and could be considered as a high-risk variant for CRC predisposition.

关键词： Interleukin-8-251T〉A Polymorphism Colorectal cancer Malaysians

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Smart Objects Identification System for Robotic Surveillance

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International Journal of Automation and computing 2014年第1期11卷 59-71页

作者： Amir Akramin Shafie Azhar Bin mohd Ibrahim Muhammad Mahbubur rashid Department of Mechatronics Engineering Faculty of EngineeringInternational Islamic University Malaysia

Video surveillance is an active research topic in computer *** this paper,humans and cars identifcation technique suitable for real time video surveillance systems is *** technique we proposed includes background subtraction,foreground segmentation,shadow removal,feature extraction and *** feature extraction of the extracted foreground objects is done via a new set of afne moment invariants based on statistics method and these were used to identify human or *** the partial occlusion occurs,although features of full body cannot be extracted,our proposed technique extracts the features of head *** proposed technique can identify human by extracting the human head-shoulder up to 60%–70%***,it has a better classifcation to solve the issue of the loss of property arising from human occluded easily in practical *** whole system works at approximately 16 29 fps and thus it is suitable for real-time *** accuracy for our proposed technique in identifying human is very good,which is 98.33%,while for cars identifcation,the accuracy is also good,which is 94.41%.The overall accuracy for our proposed technique in identifying human and car is at 98.04%.The experiment results show that this method is efective and has strong robustness.

关键词： Humans and cars identifcation partially occluded human afne moment invariants video surveillance systems machine vision

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