Displaying publications 101 - 120 of 759 in total

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  1. Optic Canal Analysis in Syndromic Craniosynostosis: Volumetric and Surface Area Validation Study Using Different Measurement Modalities
    Hariri F, Zainudin NAA, Anuar AMS, Ibrahim N, Abdullah NA, Aziz IA, et al.
    J Craniofac Surg, 2020 11 7;32(1):355-359.
    PMID: 33156163 DOI: 10.1097/SCS.0000000000006981
    BACKGROUND: In syndromic craniosynostosis (SC), unlike persistent corneal irritation due to severe exophthalmos and increased intracranial pressure, optic canal (OC) stenosis has been scarcely reported to cause visual impairment. This study aimed to validate the OC volumetric and surface area measurement among SC patients.

    METHODS: Sixteen computed tomography scan of SC patients (8 months-6 years old) were imported to Materialise Interactive Medical Image Control System (MIMICS) and Materialise 3-matics software. Three-dimensional (3D) OC models were fabricated, and linear measurements were obtained. Mathematical formulas were used for calculation of OC volume and surface area from the 3D model. The same measurements were obtained from the software and used as ground truth. Data normality was investigated before statistical analyses were performed. Wilcoxon test was used to validate differences of OC volume and surface area between 3D model and software.

    RESULTS: The mean values for OC surface area for 3D model and MIMICS software were 103.19 mm2 and 31.27 mm2, respectively, whereas the mean for OC volume for 3D model and MIMICS software were 184.37 mm2 and 147.07 mm2, respectively. Significant difference was found between OC volume (P = 0.0681) and surface area (P = 0.0002) between 3D model and software.

    CONCLUSION: Optic canal in SC is not a perfect conical frustum thus making 3D model measurement and mathematical formula for surface area and volume estimation not ideal. Computer software remains the best modality to gauge dimensional parameter and is useful to elucidates the relationship of OC and eye function as well as aiding intervention in SC patients.

    Matched MeSH terms: Software
  2. Fulltext A study on private browsing in windows environment
    Kathiravan, Yamunah, Mohd Fahmi Mohamad Amran, Noor Afiza Mat Razali, Mohd Afizi Mohd Shukran, Norshahriah Abdul Wahab, Mohammad Adib Khairuddin, et al.
    ZULFAQAR International Journal of Defence Science, Engineering & Technology, 2020;3(1):15-22.
    MyJurnal
    Privacy has always been a constant concern for many people. Internet users are often worried about the browsing information that is left on their storage media. Web browsers were later introduced with a new feature called private browsing to overcome this issue. The private browsing mode is expected to behave as normal browsing session but without storing any data such as browser cookies, history, cache and passwords on the local machine. Unfortunately, previous researchers concluded web browser often failed to provide the intended privacy protection to their user. Along the way of this reviewing process, the weakness and downside of previous web browser vendors have been identified.
    Matched MeSH terms: Software
  3. Fulltext Microleakage of class II cavities restored using composite resins
    Normaliza Ab. Malik, Marhazlinda Jamaludin, Seow, Liang Lin
    Malaysian Dental Journal, 2010;31(1):52-57.
    MyJurnal
    Objectives: To evaluate the marginal microleakage of Class II cavities restored with various types of composite resins.
    Materials and Methods: Standard Class II slot cavities were prepared at the proximal surfaces of 40 intact premolars which were divided into 4 groups. Four types of composite resins (Esthet-X-Denstply, USA, FiltekTMZ350- 3M ESPE, USA, Beautifil- Shofu, Japan and Solare P-GC, Japan) were used to restore the slot cavities. All the specimens were thermocycled and immersed in 0.5% basic fuschin dye for 24 hours. The specimens were then sectioned in mesio-distal direction. The marginal microleakage at the occlusal and cervical margin was scored using the ISO microleakage scoring system. Data was entered using SPSS Version 12.0 and analyzed using STATA software programme.
    Results and discussion: All composite resins exhibited worse microleakage at the cervical margin compared to occlusal margin. Esthet-X showed significantly better microleakage score at the occlusal margin compared to Beautifil and Solare P. FiltekTMZ350 and Beautifil showed mainly microleakage into enamel only at the occlusal margin. Solare P demostrated better resistance against microleakage at the cervical margin compared to other composite resin tested. Esthet-X, Filtek Z350 and Beautiful is not significantly different from each other in terms of microleakage at the cervical margin.
    Conclusion: This study showed that none of the materials used in this study is able to eliminate microleakage. Composite resin restorations exhibited worse micorleakage at cervical margin in comparison to occlusal margin.
    Matched MeSH terms: Software
  4. Fulltext Performance analysis of a commodity-class linux cluster for computational chemistry applications
    Omar, N.Y.M., Rahman, N.A., Zain, S.M.
    ASM Science Journal, 2009;3(1):77-90.
    MyJurnal
    Computational chemistry is a discipline that concerns the computing of physical and chemical properties of atoms and molecules using the fundamentals of quantum mechanics. The expense of computational chemistry calculations is significant and limited by available computational capabilities. The use of high-performance computing clusters alleviate such calculations. However, as high-performance computing (HPC) clusters have always required a balance between four major factors: raw computing power, memory size, I/O capacity, and communication capacity. In this paper, we present the results of standard HPC benchmarks in order to help assess the performance characteristics of the various hardware and software components of a home-built commodity-class Linux cluster. We optimized a range of TCP/MPICH parameters and achieved a maximum MPICH bandwidth of 666 Mbps. The bandwidth and latency of GA put/get operations were better than the corresponding MPICH send/receive ones. We also examined the NFS, PVFS2, and Lustre parallel filesystems and Lustre provided the best read/write bandwidths with more than 90% of those of the local filesystem.
    Matched MeSH terms: Software
  5. Fulltext Software development for real-time weed colour analysis
    Wan Ishak, W.I., Khairuddin Abdul Rahman
    Pertanika Journal of Science & Technology, 2010;18(2):-.
    MyJurnal
    The application of computer and machines for agricultural production has been one of the outstanding
    developments in Malaysian agriculture, especially in overcoming labour shortages in Oil Palm plantations. The on-line automated weedicide sprayer system was developed at Universiti Putra
    Malaysia to locate the existence and intensity of weeds in real-time environment and to spray the
    weedicides automatically and precisely. During the start of the spraying operation, the web camera
    will initially capture the image of weeds. The computer programme will compute the red, green, blue (RGB) values in the form of computer pixel. These values will be used as reference RGB values to be compared with the RGB values of the weeds captured real-time during the spraying operation. The sprayer nozzle will be turned ‘on’ or ‘off’, depending on the percentage or intensity of the green colour pixel value of weeds. The sprayer valve will open the nozzle/s when the camera detected the presence of weeds. The purpose is to reduce wastage, reduce labour, reduce cost, and control environment hazard.
    Matched MeSH terms: Software
  6. Fulltext Rootkit guard (RG) - an architecture for rootkit resistant file-system implementation based on TPM
    Yew, Teh Jia, Khairulmizam Samsudin, Nur Izura Udzir, Shaiful Jahari Hashim
    Pertanika Journal of Science & Technology, 2013;21(2):507-520.
    MyJurnal
    Recent rootkit-attack mitigation work neglected to address the integrity of the mitigation tool itself. Both detection and prevention arms of current rootkit-attack mitigation solutions can be given credit for the advancement of multiple methodologies for rootkit defense but if the defense system itself is compromised, how is the defense system to be trusted? Another deficiency not addressed is how platform integrity can be preserved without availability of current RIDS or RIPS solutions, which operate only upon the loading of the kernel i.e. without availability of a trusted boot environment. To address these deficiencies, we present our architecture for solving rootkit persistence – Rootkit Guard (RG). RG is a marriage between TrustedGRUB (providing trusted boot), IMA (Integrity Measurement Architecture) (serves as RIDS) and SELinux (serves as RIPS). TPM hardware is utilised to provide total integrity of our platform via storage of the aggregate of the clean snapshot of our platform OS kernel into TPM hardware registers (i.e. the PCR) – of which no software attacks have been demonstrated to date. RG solves rootkit persistence by leveraging on one vital but simple strategy: the mounting of rootkit defense via prevention of the execution of configuration binaries or build initialisation scripts. We adopted the technique of rootkit persistence prevention via thwarting the initialisation of a rootkit’s installation procedure; if the rootkit is successfully installed, proper deployment via thwarting of the rootkit’s
    configuration is prevented. We had subjected the RG to 8 real world Linux 2.6 rootkits and the RG was successful in solving rootkit persistence in all 8 evaluated rootkits. In terms of performance, the RG introduced a maximum of 11% overhead and an average of 4% overhead, hence permitting deployment in production environments.
    Matched MeSH terms: Software
  7. Fulltext Production of orthophoto and volume determination using low-cost digital cameras
    Khairul Nizam Tahar, Anuar Ahmad
    Pertanika Journal of Science & Technology, 2013;21(2):387-396.
    MyJurnal
    The objective of this study was to investigate the capabilities of low-cost digital cameras in volume determination. Low-cost digital cameras are capable of many applications including aerial photogrammetry and close-range photogrammetry. Low-cost digital cameras have the potential to be used in landslide monitoring and mapping. In this study, a low-cost digital camera was used as a tool to acquire digital images of a model of a simulated landslide. The model was constructed using cement and sand with the dimensions of 3m in length and 1m width. Digital images of the simulated model were acquired using the technique of aerial photogrammetry and were subsequently processed using digital photogrammetric software. A portion of the simulated model was excavated to simulate a landslide and volume determination was carried out for the excavated sand. The results showed that low-cost digital cameras can be used in photogrammetric application including volume determination.
    Matched MeSH terms: Software
  8. Fulltext Dimensional accuracy of the skull models produced by rapid prototyping technology using stereolithography apparatus
    Nizam, A., Gopal, R.N., Naing, L., Hakim, A.B., Samsudin, A.R.
    Archives of Orofacial Sciences, 2006;1(1):60-66.
    MyJurnal
    The purpose of this study was to determine the dimensional accuracy of the skull models produced by Rapid prototyping technology using stereolithography apparatus. Computed tomography images were captured from four dry normal adult human skulls. The resultant 2-D images were stored in Digital Imaging and Communications in Medicine (DICOM) format. The segmentation of the images was prepared in MIMICS software. The slice files were then exported to a stereolithography apparatus (SLA) to produce the replica of each skull. Eight linear measurements were repeatedly made between identified landmarks on each of the original skull and its replica model using an electronic digital calliper. Each of the linear measurements was repeated 5 times and the average was taken to determine the absolute difference and percent difference between the original skull and its replica model. The overall absolute difference between the four human adult skulls and its replica models was 0.23 mm with a standard deviation of 1.37 mm. The percent difference was 0.08% with a standard deviation of 1.25%. The degree of error established by this system seems affordable in clinical applications when these models are used in the field of dental surgery for surgical treatment planning.
    Matched MeSH terms: Software
  9. Fulltext Practical issues in calculating the sample size for prevalence studies
    Naing, L., Winn, T., Rusli, B.N.
    Archives of Orofacial Sciences, 2006;1(1):9-14.
    MyJurnal
    The sample size calculation for a prevalence only needs a simple formula. However, there are a number of practical issues in selecting values for the parameters required in the formula. Several practical issues are addressed and appropriate recommendations are given. The paper also suggests the application of a software calculator that checks the normal approximation assumption and incorporates finite population correction in the sample size calculation.
    Matched MeSH terms: Software
  10. Fulltext Tools for integrated river flood management (hydraulics modeling and logical framework analysis)
    Bong, C.H.J., Mah, D.Y.S, Putuhena, F.J., Said, S., Bustami, R.A.
    ASM Science Journal, 2012;6(1):47-60.
    MyJurnal
    Hydraulics simulation can be used as a supporting tool for planning and developing a framework, such as Integrated Flood Management for river management. To demonstrate this, a hydraulics model for the Sarawak River Basin was run using InfoWorks RS software by Wallingford Software, UK. InfoWorks River Simulation (RS) was chosen because its applicability has been proven and widely used to model Malaysian rivers. The extraction of computed floodwater level and flood maps for different time intervals would produce the rate of floodplain submergence from river bank level. This information could be incorporated into a logical framework to support decisions on flood management measures. Thus, hydraulics models can be used as tools to provide the necessary decision parameters for developing logical frameworks which would act as to guide the planning when it involved various stakeholders’ participation.
    Matched MeSH terms: Software
  11. Fulltext Random sampling and allocation using SPSS
    Wan Nor Arifin
    Education in Medicine Journal, 2012;4(1):129-143.
    MyJurnal
    Among most important aspects in conducting a clinical trial are random sampling and allocation of subjects. The processes could be easier if done with familiar software used for data entry and analysis instead of relying on other programs or methods. The objective of this article is to demonstrate random sampling and allocation using SPSS in step-by-step manners using examples most relevant to clinicians as well as researchers in health sciences.
    Matched MeSH terms: Software
  12. Fulltext Design of Helical Capacitance Sensor for Holdup Measurement in Two-Phase Stratified Flow: A Sinusoidal Function Approach
    Lim LG, Pao WK, Hamid NH, Tang TB
    Sensors (Basel), 2016 Jul 04;16(7).
    PMID: 27384567 DOI: 10.3390/s16071032
    A 360° twisted helical capacitance sensor was developed for holdup measurement in horizontal two-phase stratified flow. Instead of suppressing nonlinear response, the sensor was optimized in such a way that a 'sine-like' function was displayed on top of the linear function. This concept of design had been implemented and verified in both software and hardware. A good agreement was achieved between the finite element model of proposed design and the approximation model (pure sinusoidal function), with a maximum difference of ±1.2%. In addition, the design parameters of the sensor were analysed and investigated. It was found that the error in symmetry of the sinusoidal function could be minimized by adjusting the pitch of helix. The experiments of air-water and oil-water stratified flows were carried out and validated the sinusoidal relationship with a maximum difference of ±1.2% and ±1.3% for the range of water holdup from 0.15 to 0.85. The proposed design concept therefore may pose a promising alternative for the optimization of capacitance sensor design.
    Matched MeSH terms: Software
  13. Fulltext Technique for Early Reliability Prediction of Software Components Using Behaviour Models
    Ali A, N A Jawawi D, Adham Isa M, Imran Babar M
    PLoS One, 2016 Sep 26;11(9):e0163346.
    PMID: 27668748 DOI: 10.1371/journal.pone.0163346
    Behaviour models are the most commonly used input for predicting the reliability of a software system at the early design stage. A component behaviour model reveals the structure and behaviour of the component during the execution of system-level functionalities. There are various challenges related to component reliability prediction at the early design stage based on behaviour models. For example, most of the current reliability techniques do not provide fine-grained sequential behaviour models of individual components and fail to consider the loop entry and exit points in the reliability computation. Moreover, some of the current techniques do not tackle the problem of operational data unavailability and the lack of analysis results that can be valuable for software architects at the early design stage. This paper proposes a reliability prediction technique that, pragmatically, synthesizes system behaviour in the form of a state machine, given a set of scenarios and corresponding constraints as input. The state machine is utilized as a base for generating the component-relevant operational data. The state machine is also used as a source for identifying the nodes and edges of a component probabilistic dependency graph (CPDG). Based on the CPDG, a stack-based algorithm is used to compute the reliability. The proposed technique is evaluated by a comparison with existing techniques and the application of sensitivity analysis to a robotic wheelchair system as a case study. The results indicate that the proposed technique is more relevant at the early design stage compared to existing works, and can provide a more realistic and meaningful prediction.
    Matched MeSH terms: Software
  14. Fulltext A behavior of reinforced vibrocompacted stone column in peat
    Prasad, Arun, Kazemian, Sina, Kalantari, Behzad, Bujang B.K. Huat
    Pertanika Journal of Science & Technology, 2012;20(2):221-241.
    MyJurnal
    In the literature, several methods of ground improvement have been presented including compacted stone columns. The bearing capacity of the granular column is governed mainly by the lateral confining pressure mobilized in the soft soil to restrain or prevent bulging of the granular column. Therefore, the technique becomes unfeasible in peat that does not provide sufficient lateral confinement. This condition can be overcome by encasing the stone column with geogrid. This paper investigates the performance of the geogrid encased vibrocompacted stone column in peat. This study was carried out using PLAXIS software equipped with unit cell concept. The peat was modelled using soft soil model and the stone column using Mohr-Coulomb soil model, respectively. The geogrid was modelled using the geogrid option and could take only tensile force. The results indicate that the geogrid encased stone column can take much higher load in comparison to ordinary stone columns as the stiffness of the column increases. Meanwhile, the length of encasement also varied and it was observed that it was very effective up to about two times the diameter of the column. It also increased the column stiffness, and therefore led to a significant strain reduction. It was also observed that the columns at a spacing of three times the diameter are very effective. The results presented here can be used by the geotechnical engineers to design the geogrid reinforced stone column based on the strength of the soil, diameter of the column, spacing of the columns and stiffness of the geogrid.
    Matched MeSH terms: Software
  15. Fulltext Upgrading of real-time radiation data logging and web based radiation monitoring system
    Mohd Fauzi Haris, Saaidi Ismail, Mohamad Safuan Sulaiman, Mohd Dzul Aiman Aslan, Siti Nurbahyah Hamdan, Maslina Mohd Ibrahim, et al.
    Jurnal Sains Nuklear Malaysia, 2014;26(1):36-42.
    MyJurnal
    The remote measurements of radiation level at an identified location, are not only important for
    collecting data or monitoring radiation level per se, but also crucial for workers who deal with
    radiation sources. A device for checking an on-site radiation level has been developed quite a
    long time ago under the name of Geiger Muller and widely known as a Geiger counter. The
    reading of the output can be seen on the device on-site and on real-time basis. Nowadays, with
    the fast evolution of computer and networking technology, those reading not only can be read
    real-time but also from a remote location that makes workers able to enter the risky area more
    safely. The collected data reading also can be analyzed for predicting the future trending
    pattern. The data is transferred from the monitoring devices to a server through a network. This
    paper discusses about several critical issues on the design, implementation and deployment that
    relates to the devices, interface programs, hardware and software that allow all parameters such
    as radiation levels reading and the timestamp of the data-logging can be collected and stored in
    a central storage for further processes. The compatibility issue with regards to technology
    change from the previous system will also be discussed. The system has many advantages
    compared to previous system and conventional method of doing the area monitoring in term of
    sustainability and availability.
    Matched MeSH terms: Software
  16. Analyzing Data Remnant Remains on User Devices to Determine Probative Artifacts in Cloud Environment
    Ahmed AA, Xue Li C
    J Forensic Sci, 2018 Jan;63(1):112-121.
    PMID: 28397244 DOI: 10.1111/1556-4029.13506
    Cloud storage service allows users to store their data online, so that they can remotely access, maintain, manage, and back up data from anywhere via the Internet. Although helpful, this storage creates a challenge to digital forensic investigators and practitioners in collecting, identifying, acquiring, and preserving evidential data. This study proposes an investigation scheme for analyzing data remnants and determining probative artifacts in a cloud environment. Using pCloud as a case study, this research collected the data remnants available on end-user device storage following the storing, uploading, and accessing of data in the cloud storage. Data remnants are collected from several sources, including client software files, directory listing, prefetch, registry, network PCAP, browser, and memory and link files. Results demonstrate that the collected remnants data are beneficial in determining a sufficient number of artifacts about the investigated cybercrime.
    Matched MeSH terms: Software
  17. Fulltext t-test using STATA software
    Maher D. Fuad Fuad, Munn Sann, L., Normala Ibrahim, Phang, Cheng Kar, Siti Irma Ismail, Balsam Mahdi Nasir Al-Zurfi
    Education in Medicine Journal, 2015;7(2):64-70.
    MyJurnal
    Students-t test is the most popular statistical test. The test compares two mean values to judge if they are different or not. For small data it is possible to conduct it using manual calculation – however that is not the case. Researchers would need to use statistical software and packages to conduct their analysis. This guide will help the junior researchers to conduct independent- and paired-t test using STATA software.
    Matched MeSH terms: Software
  18. Fulltext Dose exposure work planning using dmu kinematics tools
    Rosli Darmawan
    Jurnal Sains Nuklear Malaysia, 2011;23(2):12-18.
    MyJurnal
    The study on the possibility of using DMU Kinematics module in CAE tools for dose exposure work planning was carried out. A case scenario was created using 3D CAD software and transferred to DMU Kinematics module in a CAE software. The work plan created using DMU Kinematics module was animated to simulate a real time scenario. Data on the phantom position against the radioactive source was collected by activating positioning sensors in the module. The data collected was used to calculate the estimated dose rate exposure for the phantom. The results can be used to plan the safest and optimum procedures in carrying out the radiation related task.
    Matched MeSH terms: Software
  19. Fulltext Development of a SANS data acquisition GPIB interface using wavemetrics Igor
    Muhammad Akmal Asraf Mohamad Sharom, Zainol Abidin Ibrahim, Wan Ahmad Tajuddin Wan Abdullah, Megat Harun Al Rashid Megat Ahmad, Faridah Mohamad Idris, Abdul Aziz Mohamed
    Journal of Nuclear and Related Technologies, 2011;2011(1):39-50.
    MyJurnal
    Small angle neutron scattering (SANS) is used for probing the microstructure of materials in the range between 1-100 nm in dimension. The scattered neutrons from the target material were detected by a 128 x 128 array area sensitive, Helium gas-filled proportional counter, which is known as Position Sensitive Detector (PSD). The small angle neutron scattering (SANS) facility in Malaysian Nuclear Agency has been developed since 1995. The data acquisition system of this prototype facility consists of the two-dimensional Position Sensitive Detector (2D-PSD) and neutron monitor as a data grabber, TDC Histogram as a memory processing processor, two units of ORTEC 994 as a counter and timer and a computer as a data acquisition controller via GPIB interfacing protocol. This paper will describe on the development of GPIB interface for data acquisition of the SANS instrument on Windows based platform. The GPIB device interface and graphical user interface (GUI) for this data acquisition is developed using WaveMetrics Igor software.
    Matched MeSH terms: Software
  20. Fulltext Online 3D terrain visualization of GIS data: a comparison between three different web servers
    Ruzinoor Che Mat, Abdul Rashid Mohd. Shariff, Pradhan, Biswajeet, Ahmad Rodzi Mahmud
    Pertanika Journal of Science & Technology, 2011;19(3):31-39.
    MyJurnal
    Geographical Information Systems (GIS) and three dimensional (3D) World Wide Web (WWW) applications usage are on the rise. The demand for online 3D terrain visualization for GIS data has increased. Current users demand for more complex data which have higher accuracy and realism. This is aided by the emergence of geo-browsers in the market which provide free service and also cater for the commercialized market. Other new technology driving the market is the use of software such as CityGML, Virtual Reality Markup Language (VRML)/ Entensive 3D (X3D), geoVRML, and Keyhole Markup Language (KML). These technologies also play an important role for this new era of online 3D terrain visualization. The aim of this paper is to implement the online 3D terrain visualization for GIS data by using VRML technology and launching the system into three different web servers. The data used for this system are contour data and high resolution satellite image (QUICKBIRD) for Universiti Putra Malaysia (UPM) area. Testing was done only for satellite image overlaid to 3D terrain data. The web servers used in this experiment were the Spatial Research Group Server in UPM, Universiti Utara Malaysia (UUM) web server, and ruzinoor.my web server. The comparison was based on the performance of web servers in terms of accessibility, uploading time, CPU usage, frame rate per second (fps), and number of users. The results from this experiment will be of help and guidance to the developers in finding the right web servers for the best performance on implementing online 3D terrain visualization for GIS data.
    Matched MeSH terms: Software
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