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Ahmed El Shafie,Ahmed Sultan Salem 한국통신학회 2015 Journal of communications and networks Vol.17 No.3
In a recent paper [1], the authors investigated the maximum stable throughput region of a network composed of a rechargeable primary user and a secondary user plugged to a reliable power supply. The authors studied the cases of an infinite and a finite energy queue at the primary transmitter. However, the results of the finite case are incorrect. We show that under the proposed energy queue model (a decoupled M/D/1 queueing system with Bernoulli arrivals and the consumption of one energy packet per time slot), the energy queue capacity does not affect the stability region of the network.
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N. E. A. SHAFIE,H. M. KAMAR,N. KAMSAH 한국자동차공학회 2016 International journal of automotive technology Vol.17 No.5
Ventilation system in a bus is employed to provide good indoor air quality and thermal comfort for passengers. Poor ventilation system will increase the concentration level of air contaminants which could affect the passenger’s health. The presence mixing ventilation system used in many buses is not efficient in removing the air contaminants from the passenger compartments. This article presents a study on the effects of using different ventilation setups on the concentration level of gases and particulate matters inside a passenger compartment of a university’s shuttle bus. The goal is to find a suitable layout of the air supply diffusers and air return grilles that would lower the concentration level of contaminants inside the passenger compartment. Field measurements were carried out to quantify the concentration of gases (carbon monoxide, carbon dioxide and formaldehyde) and particulate matters (PM1, PM2.5 and PM10). The measurements were done at the front section of the bus compartment, close to the front door. The data were acquired in the morning, afternoon and evening hours during a clear and sunny day. The bus travelled along an in-campus road with no passengers. A simplified three-dimensional model of the bus compartment was developed using computational fluid dynamics software. Flow analyses were carried out to predict distribution of gases and particulate matters concentration. The concentrations of carbon dioxide, carbon monoxide, formaldehyde and particulate matters obtained from the field measurements were used as boundary conditions and for validating the computational model. A parametric study was carried out to identify a suitable layout of air supply diffusers and air return grilles that would lower the concentration level of the air contaminants. Two types of ventilation systems were considered namely a displacement ventilation and an underfloor air distribution. Results show that the underfloor air distribution system is more effective in reducing the concentration level of gases and particulate matters inside the passenger compartment compared to the displacement ventilation system.
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Zulfida Mohamad Hafis Mohd Shafie,ABDUL LATIF AHMAD 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
New dope formulation was synthesized to fabricate an antibacterial and antifouling hollow fiber (HF) membrane using polyvinyl alcohol (PVA)–zinc oxide (ZnO) blend, mediated by lithium chloride (LiCl). Study was done between neat polyethersulfone (PES), PES–ZnO, PES–PVA, and PES–PVA–ZnO membrane samples. The addition of PVA improved the antifouling properties with the lowest recorded relative humic acid flux (HAF) above 0.95. On the other hand, PVA–ZnO incorporation improved the humic acid rejection up to 96.03 ± 1.07%. Minimal bacterial formation was found on ZnO present sample surfaces, suggesting superior antibacterial properties.
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Current Trends and Future Directions on Women CEOs/CFOs and Financial Reporting Quality
Ismaanzira ISMAIL,Rohami SHAFIE,Ku Nor Izah Ku ISMAIL 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.11
The aim of this paper is to review studies of women chief executive officers (CEOs) and chief financial officers (CFOs) in the context of financial reporting quality. By using electronic searches and keywords to identify relevant studies, a total of 22 published studies are identified over the period 2010-2020. Based on the review, two underpinning theories have been widely used in examining the effect of women CEOs/CFOs on the quality of financial reporting, namely, risk aversion theory and gender-ethics theory. In addition, a majority of the studies documented that women CEOs/CFOs lead to more conservative reporting and higher earnings quality. The findings underscore the importance to examine the gender issue in accounting literature and established a business and management case for women to attain the top position whether as a CEO or CFO. This paper also recommends to practitioners and regulators about the effect of having women as CEOs or CFOs on financial reporting quality as women are a pool of talent that is underutilized. In addition, this paper goes beyond a classic narrative review by suggesting future research avenues to examine further such issues in order to broaden the understanding of the role of women in accounting.
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Experimental and Numerical Study of a Seismic Rotating Mass Damper (RMD) in an Isolated Floor
Afshin Kalantari,Reihane Shafie Panah 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.4
Negative stiffness has shown a capable characteristic in reduction of seismic response of structures. In this paper a passive Rotating Mass Damper (RMD) with negative stiffness characteristic, which was conceptually introduced in an earlier study, has been employed experimentally and numerically on an isolated floor to protect the building content during strong ground motions. The equipment was assumed as a rigid block on the isolated floor. The RMD devices force results indicate the negative stiffness characteristic of the damper. It was also observed that the RMD could increase the natural period of the system up to 50 percent without increasing the mass or reducing the stiffness. A numerical model of a seven storey building was employed to investigate the seismic response of the isolation floor in fourth storey. Two RMD models with different specifications and a viscous damper providing 10 percent of critical damping were applied in the study. Seven ground motion records were selected from PEER ground motion database. The time history analysis results indicate that RMD dampers show acceptable performance in terms of reducing both acceleration up to 40% and displacement responses up to 68% simultaneously in comparison with the viscous damper under the applied ground motions. The model was also analyzed employing seven artificial seismic waves. The results in this part also show the capability of the damper model in generating negative stiffness characteristics and a successful performance during excitation.
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Models for Internet Traffic Sharing in Computer Network
Alrusaini, Othman A.,Shafie, Emad A.,Elgabbani, Badreldin O.S. International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.8
Internet Service Providers (ISPs) constantly endeavor to resolve network congestion, in order to provide fast and cheap services to the customers. This study suggests two models based on Markov chain, using three and four access attempts to complete the call. It involves a comparative study of four models to check the relationship between Internet Access sharing traffic, and the possibility of network jamming. The first model is a Markov chain, based on call-by-call attempt, whereas the second is based on two attempts. Models III&IV suggested by the authors are based on the assumption of three and four attempts. The assessment reveals that sometimes by increasing the number of attempts for the same operator, the chances for the customers to complete the call, is also increased due to blocking probabilities. Three and four attempts express the actual relationship between traffic sharing and blocking probability based on Markov using MATLAB tools with initial probability values. The study reflects shouting results compared to I&II models using one and two attempts. The success ratio of the first model is 84.5%, and that of the second is 90.6% to complete the call, whereas models using three and four attempts have 94.95% and 95.12% respectively to complete the call.
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Mustaffa Khairu Hazwan,Shafie Asrul Akmal,Ngu Lock-Hock 한국간호과학회 2022 Asian Nursing Research Vol.16 No.3
Purpose: To compare patient care multipliers estimated from subjective evaluation against work sampling (WS) techniques in genetic nursing activities. Methods: An observational WS technique was conducted from November to December 2019 with nine genetic nurses in a tertiary referral center in Malaysia. The WS activity instrument was devised, validated, and pilot tested. All care- and non-care-related activities were sampled at 10-minute intervals within 8 hours of working over 14 days, followed by a subjective evaluation of activities survey over the same period. Bonferroni correction was undertaken for multiple testing with a p value of 0.0025. Results: The two techniques produced significant differences in genetic nurses’ activities categorization. The WS showed that compared with subjective evaluation, direct care (19.3% vs. 45.0%; p < .001) was estimated to be significantly lower, and indirect care (40.4% vs. 25.6%; p < .001) and unit-related activity (28.5% vs. 16.9%; p < .001) were higher. Both techniques produced a similar proportion of time spent in other non-care activities (12.0%) but differed in genetic meetings and information-gathering activities. While the multipliers for patient face-to-face contact were significantly larger between WS (4.57) and the survey (1.94), the multipliers for patient care time were smaller between WS (1.47) and the survey (1.24), indicating that caution should be taken when multiplying for patient contact time compared to patient care activity to determine the cost of care provision. Conclusion: A considerable proportion of time spent away from the patient needs to be allocated to patient-related care time. Thus, estimating the paid cost solely based on direct time with patients considerably underestimates the cost per hour of nurses' care. It is recommended to employ ‘patientrelated activity’ instead of the ‘face-to-face contact’ multiplier because the former did not significantly differ from the one estimated using WS.
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