Buckling of plates including effect of shear deformations: a hyperelastic formulation

Idris A. Musa 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.57 No.6

Consistent finite strain Plate constitutive relations are derived based on a hyperelastic formulation for an isotropic material. Plate equilibrium equations under finite strain are derived following a static kinematic approach. Three Euler angles and four shear angles, based on Timoshenko beam theory, represent the kinematics of the deformations in the plate cross section. The Green deformation tensor has been expressed in term of a deformation tensor associated with the deformation and stretches of an embedded plate element. Buckling formulation includes the in-plane axial deformation prior to buckling and transverse as well as in-plane shear deformations. Numerical results for a simply supported thick plate under uni-axial compression force are presented.

Systematic Literature Review on Cloud Adoption

Idris Lawal Bagiwa,Imran Ghani,Muhammad Younas,Mannir Bello 한국인터넷방송통신학회 2016 International Journal of Internet, Broadcasting an Vol.8 No.2

While many organizations believe that cloud computing has the potential to reduce operational cost by abstracting capital assets like data storage center and processing systems into a readily on demand available and affordable operating expenses, still many of these organizations are not aware of the factors determining the performance of cloud computing technology. This paper provides a systematic literature review focusing on the factors determining the performance of cloud computing. In trying to come up with this review, the following sources were searched for relevant articles: ScienceDirect, Scientific.Net, ACMDigital Library, IEEE Xplore, Springer, World Scientific Journal, Wiley Online Library, Academic Search Premier (via EBSCOHost) and EdITLib (Education & Information Technology Digital Library). In first search strategy, approximately 100 keywords related to the research domain like; "Cloud Computing" and "Cloud Services" were used. In second search strategy, 65 keywords more related to the research domain were selected. In the third search strategy, the primary materials were identified and classified according to the paper types (Journal or Conference), year of publication and so on. Based on this study, twenty (20) factors were found that determine the performance of cloud computing. The IT organization needs to consider these twenty (20) factors in order to adopt cloud computing.

Comparison between different combinations of chemical treatment on parthenogenetic activation of mouse oocytes and its subsequent embryonic development

Idris Siti Khadijah,Ramli Bin Abdullah,Wan Embong Wan Khadijah,Mohammad Mijanur Rahman 한국통합생물학회 2013 Animal cells and systems Vol.17 No.3

Combination of different chemicals has been an effective method to activate oocytes. The objectives of this study were to evaluate the optimal: (1) concentration (Experiment 1) and duration (Experiment 2) of strontium chloride (SrCl2) in the presence of cytochalasin B (CB), (2) secondary activation agent [6-dimethylaminopurine (6-DMAP),cycloheximide (CHX) and CB] in combination with calcium ionophore (CaI) (Experiment 3) and (3) ethanol (EtOH)concentration in combination with 6-DMAP (Experiment 4). There were no significant (P0.05) differences in cleavage (86.8289.06%) and blastocyst (33.4246.83%) rates when oocytes were treated with various concentrations of SrCl2 (210 mM). Three-hour duration generally showed the highest cleavage (93.83%) and blastocyst rates (60.42%) compared to other durations. Comparing with various combinations, CaI6-DMAP showed the highest cleavage at all stages of development and significantly (PB0.05) higher from other combinations at 8-cell (50.58%),morula (30.29%) and blastocyst (23.28%) stages. When comparing the EtOH concentrations, 8% EtOH gave significantly (PB0.05) highest cleavage rates at 8-cell stage (39.70%), morula (21.50%) and blastocyst (13.86%) stages followed by 9% and 7% EtOH. In conclusion, 10 mM SrCl25 mg/ml CB in calcium-free Chatot Ziomek Bavister medium for 3-h incubation duration gave the highest cleavage rates of parthenotes mouse oocytes.

Horizontal and Vertical Diversity of Ichneumonid Wasps (Hymenoptera: Ichneumonidae) in the Sungkai Wildlife Forest Reserve in Perak, Malaysia

Idris, A.B.,Kee, S.S. Korean Society of Applied Entomology 2002 Journal of Asia-Pacific Entomology Vol.5 No.1

A study on diversity of ichneumonid wasps in the Sungkai Forest Reserve was studied from June to September in 2000. To investigate the horizontal diversity, samplings were taken using Malaise traps placed along three transect .lines started from forest edge to 600 m into the forest interior. For the vertical diversity study, traps were installed at the base and top portion of the 12 m towers. In the horizontal diversity study, diversity of ichneumonid species (H') increased toward the interior forest but the diversity was not significantly different between 400 m and 600 m treatments. In the vertical diversity study, species diversity decreased as we go upward direction. The species similarity index (Jaccard's coefficient index) indicated that the number of ichneumonid species was significantly different among treatments. The reasons for low ichneumonid diversity at 12 m above ground and no change in diversity as we go deeper in to the forest are discussed.

Intensity estimation with log-linear Poisson model on linear networks

Idris Demirsoy,Fred W. Huffer 한국통계학회 2023 Communications for statistical applications and me Vol.30 No.1

Purpose: The statistical analysis of point processes on linear networks is a recent area of research that studies processes of events happening randomly in space (or space-time) but with locations limited to reside on a linear network. For example, trac accidents happen at random places that are limited to lying on a network of streets. This paper applies techniques developed for point processes on linear networks and the tools available in the R-package spatstat to estimate the intensity of trac accidents in Leon County, Florida. Methods: The intensity of accidents on the linear network of streets is estimated using log-linear Poisson models which incorporate cubic basis spline (B-spline) terms which are functions of the x and y coordinates. The splines used equally-spaced knots. Ten dierent models are fit to the data using a variety of covariates. The models are compared with each other using an analysis of deviance for nested models. Results: We found all covariates contributed significantly to the model. AIC and BIC were used to select 9 as the number of knots. Additionally, covariates have dierent eects such as increasing the speed limit would decrease trac accident intensity by 0.9794 but increasing the number of lanes would result in an increase in the intensity of trac accidents by 1.086. Conclusion: Our analysis shows that if other conditions are held fixed, the number of accidents actually decreases on roads with higher speed limits. The software we currently use allows our models to contain only spatial covariates and does not permit the use of temporal or space-time covariates. We would like to extend our models to include such covariates which would allow us to include weather conditions or the presence of special events (football games or concerts) as covariates.

Paperless Business Environment of Malaysia

Idris, Irwan Arma Asian Pacific Women's Information Network Center t 2009 APWIN Vol.10 No.-

Perceived Usefulness of Business Coaching on the Relationship between Entrepreneurial Competencies and Business Success

IDRIS, Mohd Mahfudz bin,ABU BAKAR, Saridan bin Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.10

The present study aims to investigate the perceived usefulness of business coaching as a moderator between the association of entrepreneurial competencies and business success of women micro-entrepreneurs. This study employs a stratified random sampling technique to collect data from women micro-entrepreneurs who attended business coaching sessions. In total, 261 questionnaires were distributed and collected. This study has divided the moderator (i.e., perceived usefulness of business coaching) into two groups, namely, group 1 (with a low mean) and group 2 (with a high mean) for moderation analysis. By using a comparative analysis of the path coefficient for groups 1 and 2, the path is moderated by the perceived usefulness of business coaching if the beta value for group 1 is significant, and the beta value for group 2 is non-significant. The results show that eight out of a total of sixteen hypotheses were supported, while the remaining hypotheses were rejected. The findings of the study suggest that the domains of entrepreneurial competencies for women micro-entrepreneurs, including strategic, commitment, conceptual, opportunity, and relationship competencies, together with the perceived usefulness of business coaching, are vital for the business success and should remain the principal focus of future research in women entrepreneurship.

Awareness and Utilization of the Internet Resources and Services for Academic Activities by the Academics of Tertiary Institutions in Adamawa State, Nigeria

Idris Suleiman,Dauda Joshua 건국대학교 지식콘텐츠연구소 2019 International Journal of Knowledge Content Develop Vol.9 No.2

This study was conducted to investigate the awareness and utilization of the Internet resources and services for academic activities by the academic staff of tertiary institutions in Adamawa State. The researchers adopted a quantitative research method using cross-sectional survey design to collect data from the respondents. Multi-stage sampling techniques were used. Three hundred and thirty-three (333) copies of the questionnaire were administered to the respondents in the eight (8) sampled institutions and two hundred and ninety-two (292) respondents representing (87.6%) were returned and found useful. The data collected were analyzed using descriptive and inferential statistics by the use of SPSS version 20.0. The findings revealed that respondents were aware of all the Internet resources, (e-books, e-journals, and online databases), but regarding the Internet services, they were mostly aware of only the e-mail. The study further found that online database and e-mail as the most Internet resources and services utilized by the respondents. There are inverse and weak relationship between awareness and utilization of the Internet resources and services by the academic staff of tertiary institutions in Adamawa State. The study recommends increase awareness and use to other Internet resources such as the e-books and e-journal and Internet services, especially Usenet, Discussion group and Telnet by the management of the institutions through training, workshops/conferences for better academic activities.

ON *-PRIMES AND *-VALUATIONS

Idris, Ismail M. Department of Mathematics 1992 Kyungpook mathematical journal Vol.32 No.1

Comparison of the Average of Five Readings with Averages from Fewer Readings for Automated Oscillometric Blood Pressure Measurement in an Outpatient Clinic

Idris Oladipo,Ayoade Adedokun 대한심장학회 2013 Korean Circulation Journal Vol.43 No.5

Background and Objectives: The optimal number of consecutive measurements for obtaining an average blood pressure (BP) reading in clinical practice is yet undefined by research. This study aimed to compare readings obtained from an average of 5 with averages of 2, 3,and 4, sequential measurements. Subjects and Methods: Using an automated oscillometric device (BpTRU), BP measurement was conducted on 410 consenting adults attending a general outpatients clinic. Comparison of an average of 5 readings with averages of 2, 3, and 4 readings involved evaluation of correlations, Bland-Altman analysis, comparison of means and distribution of readings, and determination of the proportion of differences between compared readings which were clinically non-significant. Results: 397 (96.8%) sets of complete BP readings were suitable for analysis. Clinically non-significant differences (≤5 mm Hg) were found between at least 79.3% (n=315) and 96.5% (n=383) of compared systolic and diastolic readings, respectively. Bland-Altman’s analysis re-vealed that the 95% limits of agreement for the differences between compared readings were approximately 2-4, 3-7, and 4-11 mm Hg for 2, 3 and 4 readings’ systolic comparisons while those for diastolic comparisons were 2-3, 3-5, and 4-7 mm Hg, respectively. Statistically non-significant differences were observed in all comparisons of the distributions of readings that were classified as <140 mm Hg or ≥140mm Hg and <90 mm Hg or ≥90 mm Hg for systolic and diastolic readings, respectively. Strong positive correlations were found between 5 average readings and each of 2, 3, and 4 average readings, respectively. Conclusion: An average of 5 readings may be excessive for routine BP measurement using this device at outpatient clinics.