A Case Study:The Effects of Job Satisfaction on Hotel Guests

Ameneh Hekmat,Afsaneh Hekmat,Fardin Safari 세계문화관광학회 2011 Conference Proceedings Vol.12 No.-

One of the main goals of any successful industry is to survive against competitors in the long run. The necessity of keeping the customers and maintaining reputation drives the industry holders to fulfil all the requirements via customer satisfaction. Satisfaction of hotel guests is therefore one of the major concerns of lodging services in tourism industry globally including Penang resort in Malaysia. Consequently the main concept of this research is to investigate the effect of hotel employees' job satisfaction on hotel guests' satisfaction.

Effects of Different Angles of the Traction Table on Lumbar Spine Ligaments: A Finite Element Study

Hekmat Farajpour,Nima Jamshidi 대한정형외과학회 2017 Clinics in Orthopedic Surgery Vol.9 No.4

Background: The traction bed is a noninvasive device for treating lower back pain caused by herniated intervertebral discs. In this study, we investigated the impact of the traction bed on the lower back as a means of increasing the disc height and creating a gap between facet joints. Methods: Computed tomography (CT) images were obtained from a female volunteer and a three-dimensional (3D) model was created using software package MIMICs 17.0. Afterwards, the 3D model was analyzed in an analytical software (Abaqus 6.14). The study was conducted under the following traction loads: 25%, 45%, 55%, and 85% of the whole body weight in different angles. Results: Results indicated that the loading angle in the L3–4 area had 36.8%, 57.4%, 55.32%, 49.8%, and 52.15% effect on the anterior longitudinal ligament, posterior longitudinal ligament, intertransverse ligament, interspinous ligament, and supraspinous ligament, respectively. The respective values for the L4–5 area were 32.3%, 10.6%, 53.4%, 56.58%, and 57.35%. Also, the body weight had 63.2%, 42.6%, 44.68%, 50.2%, and 47.85% effect on the anterior longitudinal ligament, posterior longitudinal ligament, intertransverse ligament, interspinous ligament, and supraspinous ligament, respectively. The respective values for the L4–5 area were 67.7%, 89.4%, 46.6%, 43.42% and 42.65%. The authenticity of results was checked by comparing with the experimental data. Conclusions: The results show that traction beds are highly effective for disc movement and lower back pain relief. Also, an optimal angle for traction can be obtained in a 3D model analysis using CT or magnetic resonance imaging images. The optimal angle would be different for different patients and thus should be determined based on the decreased height of the intervertebral disc, weight and height of patients.

Conformational and Structural Changes of Choline Oxidase from Alcaligenes Species by Changing pH Values

Hekmat, A.,Saboury, A. A.,Divsalar, A.,Khanmohammadi, M. Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.8

Results of intrinsic and extrinsic fluorescence studies on choline oxidase revealed that the enzyme at high alkaline pH values has more accessible hydrophobic patches relative to acidic pH. Fluorescence quenching studies with acrylamide confirm these changes. The quenching constants were also determined at different pH(s) by using the Stern-Volmer equation. CD studies showed that at higher pH a transition from $\alpha$-helix to $\beta$- structure was appeared while at lower pH the content of $\alpha$-helix structure was increased. Furthermore, analysis of the spectral data using chemometric method gave evidence for existence of intermediate components at very high pH(s). Results of thermal denaturation evaluated that the enzyme has the most instability at higher pH(s). Altogether low and high pH values caused significant alteration on secondary and tertiary structures of choline oxidase via inducing of an intermediate.

Institute for Experimental Mathematics, University of Duisburg-Essen in Ad-hoc and Sensor Networks

R. Hekmat,X. An 보안공학연구지원센터 2008 International Journal of Hybrid Information Techno Vol.1 No.2

Neighbor attachment is the process of establishing links between nodes that on the physical layer are visible to each other. In ad-hoc and sensor networks many strategies can be followed to connect to adjacent nodes. A simple scenario would be to consider all nodes within the transmission range of a node as its neighbors. More sophisticated scenarios can establish neighborhood relations with a limited number of carefully selected nodes. Different neighbor attachment policies result into different network topologies at the link-layer. In any topology a packet sent from a node to one of its neighbors will experience interference, which is caused by simultaneous communications between other nodes in the network. Obviously, high levels of interference would severely disrupt communications and reduce overall network capacity. In this paper we examine how neighbor attachment policies can change the amount of interference experienced by network nodes. We will also show that Carrier-to- Interference ratio (C/I) is directly affected by neighbor attachment policies. Our study enables us to identify neighbor attachment directives that can reduce interference, or optimize C/I in large multi-hop ad-hoc and sensor networks.

Conformational and Structural Changes of Choline Oxidase from Alcaligenes Species by Changing pH Values

A. Hekmat, A. A. Saboury,A. Divsalar,M. Khanmohammadi 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.8

Results of intrinsic and extrinsic fluorescence studies on choline oxidase revealed that the enzyme at high alkaline pH values has more accessible hydrophobic patches relative to acidic pH. Fluorescence quenching studies with acrylamide confirm these changes. The quenching constants were also determined at different pH(s) by using the Stern-Volmer equation. CD studies showed that at higher pH a transition from α-helix to β- structure was appeared while at lower pH the content of α-helix structure was increased. Furthermore, analysis of the spectral data using chemometric method gave evidence for existence of intermediate components at very high pH(s). Results of thermal denaturation evaluated that the enzyme has the most instability at higher pH(s). Altogether low and high pH values caused significant alteration on secondary and tertiary structures of choline oxidase via inducing of an intermediate.

Constrained and non-constrained aerodynamic optimization using the adjoint equations approach

Mohamad Hamed Hekmat,Masoud Mirzaei,Ehsan Izadpanah 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.9

In this research, the continuous adjoint method is applied to optimize an airfoil in subsonic and transonic flows. An inverse design problem is solved to evaluate the ability of the optimization algorithm and then, two types of optimizations, constrained and non-constrained, are investigated in a drag minimization problem. In the non-constrained drag minimization problem, the optimization is performed in a fixed angle of attack with neither geometric nor aerodynamic constraint, but in the constrained drag minimization problem, the optimization is performed in a fixed lift coefficient. Comparison of the results of these two optimizations shows the effects of the constraint on the optimization trend and the optimized geometry. Moreover, imposing the aerodynamic constraint increased the computational costs of the adjoint method. In constrained and non-constrained drag minimization problems, the surface points are adopted as design variables to show the performance of the adjoint equations approach in problems with numerous design variables.

Technical Note : Response of black, cranberry, kidney, and white bean to Linuron

Peter H. Sikkema,Sharareh Hekmat,Christy Shropshire,Nader Soltani 한국잡초학회 2009 Weed Biology and Management Vol.9 No.2

An inclined FGM beam under a moving mass considering Coriolis and centrifugal accelerations

Vahid Shokouhifard,Saeedreza Mohebpour,Parviz Malekzadeh,Hekmat Alighanbari 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.35 No.1

In this paper, the dynamic behaviour of an inclined functionally graded material (FGM) beam with different boundary conditions under a moving mass is investigated based on the first-order shear deformation theory (FSDT). The material properties vary continuously along the beam thickness based on the power-law distribution. The system of motion equations is derived by using Hamilton’s principle. The finite element method (FEM) is adopted to develop a general solution procedure. The moving mass is considered on the top surface of the beam instead of supposing it on the mid-plane. In order to consider the Coriolis, centrifugal accelerations and the friction force, the contact force method is used. Moreover, the effects of boundary conditions, the moving mass velocity and various material distributions are studied. For verification of the present results, a comparative fundamental frequency analysis of an FGM beam is conducted and the dynamic transverse displacements of the homogeneous and FGM beams traversed by a moving mass are compared with those in the existing literature. There is a good accord in all compared cases. In this study for the first time in dynamic analysis of the inclined FGM beams, the Coriolis and centrifugal accelerations of the moving mass are taken into account, and it is observed that these accelerations can be ignored for the low-speeds of the moving mass. The new provided results for dynamics of the inclined FGM beams traversed by a moving mass can be significant for the scientific and engineering community in the area of FGM structures.

Hydrostatic pressure and magnetic field effect on the excited states in inverse parabolic quantum dot

S.A. Safwan,Assma Saleh,Hekmat M. Hassanein,Nagwa El Meshed 한국물리학회 2018 Current Applied Physics Vol.18 No.1

The hydrostatic pressure (P) influence of the degenerate energy states inside an inverse parabolic quantum dot (IPQD), with and without an external magnetic field, was performed within the frame of the effective mass approximation. Our theoretical results showed that the effect of relatively high pressure clearly appeared to induce a crossing between the excited states in the strong confinement region. But in the weak confinement region, such crossing disappeared and, in addition, the excited states got reordered. In the presence of an external magnetic field the hydrostatic pressure modified the crossing points of the degenerate states. We investigated the electron-heavy hole transition energy. It displayed a blue shift with increasing the pressure values and the magnetic field strength. But it showed an adhesive red shift by increasing the IPQD size.

Correlations between anatomical variations of the nasal cavity and ethmoidal sinuses on cone-beam computed tomography scans

Abbas Shokri,Mohammad Javad Faradmal,Bahareh Hekmat 대한영상치의학회 2019 Imaging Science in Dentistry Vol.49 No.2

Purpose: Anatomical variations of the external nasal wall are highly important, since they play a role in obstruction or drainage of the ostiomeatal complex and ventilation and can consequently elevate the risk of pathological sinus conditions. This study aimed to assess anatomical variations of the nasal cavity and ethmoidal sinuses and their correlations on cone-beam computed tomography (CBCT) scans. Materials and Methods: This cross-sectional study evaluated CBCT scans of 250 patients, including 107 males and 143 females, to determine the prevalence of anatomical variations of the nasal cavity and ethmoidal sinuses. All images were taken using a New Tom 3G scanner. Data were analyzed using the chi-square test, Kruskal-Wallis test, and the Mann-Whitney test. Results: The most common anatomical variations were found to be nasal septal deviation (90.4%), agger nasi air cell (53.6%), superior orbital cell (47.6%), pneumatized nasal septum (40%), and Onodi air cell (37.2%). Correlations were found between nasal septal deviation and the presence of a pneumatized nasal septum, nasal spur, and Haller cell. No significant associations were noted between the age or sex of patients and the presence of anatomical variations (P>0.05). Conclusion: Radiologists and surgeons must pay close attention to the anatomical variations of the sinonasal region in the preoperative assessment to prevent perioperative complications.