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Khasawneh, Khalid,Cho, Kun-Woo The Korean Association for Radiation Protection 2014 방사선방어학회지 Vol.39 No.2
Following the emergency work in Fukushima Daiichi nuclear power plant, more attention was paid for the radiation protection of workers working under severe accident condition. The protection procedure for the emergency workers, including the on-site emergency center, the seismic isolated building and the reestablishment of the radiation protection framework were analyzed to investigate drawbacks and deficiencies which led to adverse effects on the emergency planning and on emergency workers' health and comfort. Those drawbacks were identified and studied, and then suggestions were made to enhance the emergency working condition to avoid any future problems during severe accident emergency work and management.
Khasawneh, Khalid,Jeong, Yong Hoon Elsevier 2018 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.116 No.-
<P><B>Abstract</B></P> <P>Experimental investigations of high pressure steam condensation heat transfer are limited due to technical requirements and construction costs of experimental facilities. Applying fluid-to-fluid scaling methods is a possible way to overcome those difficulties. Performing experiments with simulant fluid, Freon for instance, allows testing at low pressure, low temperature and with low power requirements compared with the prototype. Fluid-to-fluid scaling criteria for modeling high pressure steam condensation have been developed based on two approaches, the Buckingham Pi theorem and the non-dimensionalization of the governing equations and the interface boundary conditions. Both criteria have been validated using eight benchmark problems and based on three different condensation models. The approach based on the non-dimensionalization of the governing equations and the interface boundary conditions showed a better method for modeling the high pressure steam condensation phenomena. It showed that, in order to guarantee the similarity between the prototype and the model, the liquid-to-vapor density ratio, the Froude number and the vapor Reynolds number should be preserved. In comparison with the prototype, by applying the scaling criteria to model steam condensation in secondary system passive decay heat removal system of a pressurized water nuclear reactor, the model's pressure can be reduced by six times. Therefore, reducing the cost of conducting experimental tests.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Scaling criteria developed to model high pressure steam condensation in horizontal tubes. </LI> <LI> The criteria have been validated by comparing different prototype and model pairs using three different condensation models. </LI> <LI> Main dimensionless numbers for fluid-to-fluid scaling were defined. </LI> <LI> High pressure steam condensation can be accurately simulated using Freon as the working fluid. </LI> </UL> </P>
PRESSURE BASED ROUTING PROTOCOL FOR UNDERWATER WIRELESS SENSOR NETWORKS: A SURVEY
Khasawneh, Ahmad,Bin Abd Latiff, Muhammad Shafie,Chizari, Hassan,Tariq, MoeenUddin,Bamatraf, Abdullah Korean Society for Internet Information 2015 KSII Transactions on Internet and Information Syst Vol.9 No.2
Underwater wireless sensor networks (UWSNs) are similar to the terrestrial sensor networks. Nevertheless, there are different characteristics among them such as low battery power, limited bandwidth and high variable propagation delay. One of the common major problems in UWSNs is determining an efficient and reliable routing between the source node and the destination node. Therefore, researchers tend to design efficient protocols with consideration of the different characteristics of underwater communication. Furthermore, many routing protocols have been proposed and these protocols may be classified as location-based and location-free routing protocols. Pressure-based routing protocols are a subcategory of the location-free routing protocols. This paper focuses on reviewing the pressure-based routing protocols that may further be classified into non-void avoidance protocols and void avoidance protocols. Moreover, non-void avoidance protocols have been classified into single factor based and multi factor based routing protocols. Finally, this paper provides a comparison between these protocols based on their features, performance and simulation parameters and the paper concludes with some future works on which further study can be conducted.
Lubna Khasawneh,Manohar Das 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.5
This paper addresses the problem of controlling the electric power steering angle for autonomous vehicles in the presence of model parameter uncertainty and disturbances. Usually, the electric power steering manufacturer provides it as a black box to the automotive companies and does not provide the model or the model parameters. Identifying those parameters is a time-consuming process that requires a special vehicle setting, and does not always give accurate results. Inaccuracies on those parameters deteriorate the behavior of the model-based controller that is using them. To overcome those problems, an adaptive backstepping steering angle controller is designed, which assumes the steering model parameters are unknown and develops parameter update laws to estimate them. Adaptive laws are also developed to estimate the disturbance resulting from self-aligning moment. Usually, self-aligning moment estimation requires tire parameters knowledge. In the adaptive backstepping method, it is treated as disturbance and no knowledge of tire parameters is required in order to estimate it. Coulomb friction and static friction are considered as disturbances and estimated together with the self-aligning moment disturbance. The performance of the proposed method was validated with numerical simulation.
Yaqoub Al-Khasawneh,Habis Al-Zoubi 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.8
This manuscript presents an experimental evaluation of the grinding of biomass pellet samples using ball mills. These samples are the torrefied and white wood pellets. Both samples were de-agglomerated with water to determine their original particle size before the pelleting process using RRSB model. Different design and operating parameters, including; ball charge fraction, classifier speed, fuel flow rates, and orifice size, are investigated. It was found that the particle size of torrefied pellets was finer than that of the white pellets. The results showed that grinding time had a significant inversed influence with the product fineness for both pellets at the laboratory scale. For the industrial scale, the aspired fineness of ≤ 30 % residue at a mesh size of 1.0 mm was obtained with a classifier. Moreover, power consumption decreased when increasing the discharge orifice width. The lowest specific power consumption was obtained at a classifier speed of 175 rpm.
Haythem Bany Salameha,Haneen Khasawneh 한국통신학회 2021 ICT Express Vol.7 No.1
This paper proposes a routing scheme for full-duplex-(FD)-based multi-hop CRNs that attempts to maximize the packet-delivery-ratio between any source–destination pair by being aware of the time-varying nature of spectrum-availability of the operating environment. The proposed routing scheme consists of path selection and channel assignment. Two design variants are presented: one for inband- and the other for outband-FD CRNs. Our scheme is performed into three phases: path-discovery (to identify a set of feasible routes), channel-selection (to assign channels along each path) and path-selection (to select the highest effective availability-time path). Compared to a reference scheme, the simulation results indicate that being spectrum-availability-aware can achieve significant performance enhancement.
Abdur Rosyid,Bashar El-Khasawneh,Anas Alazzam 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.6
This paper presents the implementation of nonlinear least squares and iterative linear least squares algorithms for external kinematic calibration of a hybrid kinematics machine composed of two 3PRR planar parallel kinematics mechanisms by utilizing a laser tracker. First the hand-eye and robot-world transformations were obtained by a separable closed-form solution and refi ned by the nonlinear least squares. Subsequently, the geometric parameters of the machine’s mechanisms were estimated using the two algorithms. Due to the rank defi ciency, we implemented the nonlinear least squares algorithm through a subset selection approach in which we performed the estimation in two steps. We iterated the closed-form solution of the linear least squares until the solution converges to the actual values. We have shown that the nonlinear least squares algorithm successfully refi ned the hand-eye and robot-world transformations and outperformed the iterative linear squares algorithm in the estimation of the geometric parameters of the mechanisms.
Influence of mesiodens on adjacent teeth and the timing of its safe removal
Barham Majd,Okada Shunsuke,Hisatomi Miki,Khasawneh Abdullah,Tekiki Nouha,Takeshita Yohei,Kawazu Toshiyuki,Fujita Mariko,Yanagi Yoshinobu,Asaumi Junichi 대한영상치의학회 2022 Imaging Science in Dentistry Vol.52 No.1
Purpose: To focus on the effects of the presence of mesiodens on adjacent teeth and to investigate the timing of its safe removal. Materials and Methods: Cone-beam computed tomography examinations, obtained at Okayama University Hospital over a three-year period, were inspected. Data were recorded including the number of mesiodens; associated abnormalities; and the relationship with neighboring structures. Depending on multiple factors, the risk of developing complications due to early extraction of a mesiodens was divided into three categories: high, medium, and low risk. Results: A total of 5,958 cone-beam computed tomography exams were obtained, 460 patients aged 3-85 years were diagnosed with a total of 568 mesiodens, 382 (67.3%) of which were discovered in young patients (age <10 years), and 333 (87.2%) of these were associated with abnormalities. Regarding the risk categories, 11 (1.9%) were considered to be in the high-risk, five (0.9%) in the medium-risk and 552 (97.2%) in the low-risk categories. Moreover, eight out of 11 high-risk mesiodens were extracted and no post-operative complications have been seen. Conclusion: As the results showed that no postoperative complications were seen in all the extracted cases of high- risk mesiodens, this indicates the possibility of safe extraction at an early age which could reduce related future complications.