Towards Robust Key Extraction from Multipath Wireless Channels

Shehadeh, Youssef El Hajj,Alfandi, Omar,Hogrefe, Dieter The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.4

This paper tackles the problem of generating shared secret keys based on the physical characteristics of the wireless channel. We propose intelligent quantization mechanisms for key generation, achieving high secret bits generation rate. Moreover, some practical issues affecting the performance of the key generation mechanism are deeply investigated. Mainly, we investigate the effects of delay and mobility on the performance and we enhance the key generation mechanism accordingly. As a result, this paper presents a framework towards robust key generation from multipath wireless channels.

A Movement Towards the Accrual Based IPSAS Implementation in Developing Countries: Evidence from Jordan

Esam SHEHADEH 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.3

As the Jordanian government is in the process of implementing accrual-based IPSAS, this study aims to provide academics’ perspectives on the effective implementation of accrual-based IPSAS in Jordan to authorities and regulators. The findings of a survey of 124 accounting professors at Jordanian institutions reveal that adopting accrual-based IPSAS will aid in presenting the realistic financial status of governmental bodies, with various advantages to adopting accrual-based IPSAS (e.g., enhance assets and liabilities management, decisionmaking process, transparency, expenditures management). On the other side, we discovered that change is met with reluctance because the majority of public-sector accountants are untrained and unqualified to apply the accrual-based IPSAS. Another main challenge is the cost of implementing the accrual-based IPSAS in the Jordanian public sector is very high. To address these issues, employees should be motivated by providing suitable training programs, reward systems, and top management support and commitment to a successful transition. Finally, we suggested that Jordanian governments commit to using IPSAS in the public sector to increase residents’ socioeconomic advantages. Public sectors should implement IPSASs for improved management, transparency in financial reporting, accountability, and regulatory and supervisory agencies.

Analyses of Alpha-Alpha Elastic Scattering Data in the Energy Range 140 - 280 MeV

Zuhair F. Shehadeh 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.2

The differential and the reaction cross-sections for 4He-4He elastic scattering data have been nicely obtained at four energies ranging from 140 MeV to 280 MeV (lab system), namely, 140, 160, 198 and 280 MeV, by using a new optical potential with a short-range repulsive core. The treatment has been handled relativistically as v/c > 0.25 for the two lower energies and v/c > 0.31 for the two higher ones. In addition to explaining the elastic angular distributions, the adopted potentials accounted for the structure that may exist at angles close to 90, especially for the 198 and the 280-MeV incident energies. No renormalization has been used, and all our potential parameters are new. The necessity of including a short-range repulsive potential term in our real nuclear potential part has been demonstrated. Our results contribute to solving a long-standing problem concerning the nature of the alpha-alpha potential. This is very beneficial in explaining unknown alpha-nucleus and nucleus-nucleus relativistic reactions by using the cluster formalism.

Towards Robust Key Extraction from Multipath Wireless Channels

Youssef El Hajj Shehadeh,Omar Alfandi,Dieter Hogrefe 한국통신학회 2012 Journal of communications and networks Vol.14 No.4

This paper tackles the problem of generating shared secret keys based on the physical characteristics of the wireless channel. We propose intelligent quantization mechanisms for key generation,achieving high secret bits generation rate. Moreover, some practical issues affecting the performance of the key generation mechanism are deeply investigated. Mainly, we investigate the effects of delay and mobility on the performance and we enhance the key generation mechanism accordingly. As a result, this paper presents a framework towards robust key generation from multipath wireless channels.

Physical Inactivity, Water Intake and Constipation as Risk Factors for Colorectal Cancer among Adults in Jordan

Tayyem, Reema Fayez,Shehadeh, Ihab Numan,AbuMweis, Suhad Sameer,Bawadi, Hiba Ahmad,Hammad, Shatha Sabri,Bani-Hani, Kamal Eddin,Al-Jaberi, Tareq Mohammad,Alnusai, Majed Mohammed Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.9

Background: Physical activity has been found to play a role in cancer prevention. The purpose of this matched case-control study was to investigate the association between physical activity levels, water intake, constipation and colorectal cancer (CRC). Materials and Methods: Two hundred and thirty-two patients diagnosed with CRC (125 male, 107 female) were enrolled in this case-control study. Cases were matched to 271 population controls (137 male, 134 female). Results: Drinking more than 4 cups of water daily decreased the risk of CRC by 33-42%; however, this effect was non-significant. Having constipation was found to be a significant risk factor for developing CRC with an OR=6.284 (95%CI=2.741-14.40). With reference to sedentary behavior, minimum activity (600-3000 Metabolic Equivalents Task (MET)) had 43% protection against CRC and the level of Health Enhancing Physical Activity OR was 0.58 (at 95%CI; 0.37-0.92). A significant negative association was found between CRC and physical activity levels expressed as both METs and MET-hours/week (p for trend=0.017 and 0.03, respectively). Among females, a significant trend of reduction in CRC by 62% was observed with increasing the level of physical activity expressed in MET (p for trend=0.04). Conclusions: The risk of CRC may be reduced by adopting a healthy lifestyle and practicing physically activity regularly, especially among females. Consuming adequate amounts of water and healthy bowel motility could also reduce the risk of CRC.

Audit Quality and Stock Price Synchronicity: Evidence from Emerging Stock Markets

ALMAHARMEH, Mohammad I.,SHEHADEH, Ali A.,ISKANDRANI, Majd,SALEH, Mohammad H. Korea Distribution Science Association 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.3

This research examines the impact of audit quality on the extent to which firm-specific information is integrated with a firm's share price - which is determined inversely using stock price synchronicity. The study sample consists of non-financial companies listed on the Amman Stock Exchange i.e., the Jordanian Stock Market, from 2014-2018. After examining 810 firm-year observations from Jordanian industrial companies listed on the ASE, during the study period, we find that the companies using one of the BIG4 audit firms for auditing have less synchronous and more informative stock prices, suggesting high-quality audit improved governance and reduce information asymmetry between firms' insiders and investors which enhances the capitalization of firm's specific information into the stock price, thus less synchronous and more informative stock return. The findings remain consistent over 2 separate measurements of stock price synchronicity (Market and Industry model and Market Model) and show robustness for fixed effect tests. Our multivariate regression results are also robust after controlling for a number of features at the firm level with potential associations with stock price synchronicity. These include the firm size, leverage, return on assets (ROA), and market to book value (MBV).

Functional expression in the curriculum of teaching Arabic to speakers of other languages at the University of Jordan

( Basmah Ahmad Sedqi Al-dajani ),( Heba Mahmoud Shehadeh Abu Hijazi ) 한국아랍어아랍문학회 2016 아랍어와 아랍문학 Vol.20 No.2

This study aims to detect the opinion of Arabic learners - as a second language- on the importance of functional expression and their opinion on the role of the curriculum of the University of Jordan in this subject. It also aims to analyze the content of the curriculum of teaching Arabic to speakers of other languages, to recognize the exercises and its role in increasing the ability to learn functional expression in writing and orally, to identify how the lessons of the functional expression were selected in this curriculum, to identify the method through which learners can recruit what they learn in their career, and finally to detect the mistakes that Arabic learners as a second language can slip into in their expressive writing.

Selenium and Vitamin E for Prostate Cancer - Justifications for the SELECT Study

Ramamoorthy, Venkataraghavan,Rubens, Muni,Saxena, Anshul,Shehadeh, Nancy Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.7

There are several studies that relate oxidative damage as possible mechanism for many cancers. Many studies have also shown that anti-oxidants like selenium and vitamin E decrease the risk for prostate cancer. The main objective of the Selenium and Vitamin E Cancer Prevention Trial (SELECT) study was to look for the benefits of selenium and vitamin E supplementation on prostate cancer. The study had a large sample size, stringent experimental conditions, very long duration, standardized laboratories for biochemical analyses and other factors that contribute to high external validity. The SELECT study failed to show any significant risk reduction for prostate cancers ascribable to selenium and vitamin E supplementations. Because of these conflicting results, many researchers argue about the methods used, supplementations administered (selenium and vitamin E) and indicators used for assessing levels of supplementations. We reviewed many epidemiological studies, clinical trials, and pre-clinical studies. With corroborative evidences we justify that SELECT study has a sound methodology and rationale. In lieu of the contrary results of the select study, researchers should focus on the probable mechanisms for these contrary findings and continue their search for newer and effective agents for prevention of prostate cancer.

Infeasible Punishment and Noneffective Threats: Political Feasibility of Nuclear Punishment and Policy Choices after Direct Nuclear Deterrence Failure

Kim Yang Gyu,Bowen Tyler,Shehadeh Lana 인하대학교 국제관계연구소 2022 Pacific Focus Vol.37 No.3

Direct nuclear deterrence should provide significant stability considering the defender's capability to inflict enormous costs on the challenger and its high level of resolve to protect its territory and people. In the past, however, nuclear powers' deterrence strategy to prevent adversaries from escalating a crisis has failed. We argue that to manage deterrence failure crises, nuclear weapons would not matter much until the crisis actors overcome the inherent political difficulties in following through on the threat of nuclear punishment. If a defender passes this bar, then it would escalate the crisis after the deterrence failure. Conversely, if the challenger possesses high political feasibility to follow through on a threat of nuclear use, then the crisis will be terminated less violently as most defenders will view nuclear escalation as more likely and decide to compromise. We identify a total of 156 cases of direct deterrence failure after 1947 from the International Crisis Behavior Data data set. Then, using ordered logistic regression analysis, we find evidence for this feasibility of punishment hypothesis.

Evaluation of Kinetic Parameters and Thermal Stability of Melt-Quenched Bi_xSe_100-x Alloys (x≤7.5 at%) by Non-Isothermal Thermogravimetric Analysis

Ahmad, Mais Jamil A.,Abdul-Gader Jafar, Mousa M.,Saleh, Mahmoud H.,Shehadeh, Khawla M.,Telfah, Ahmad,Ziq, Khalil A.,Hergenroder, Roland Korean Society of Microscopy 2017 Applied microscopy Vol.47 No.3

Non-isothermal thermogravimetry (TG) measurements on melt-quenched $Bi_xSe_{100-x}$ specimens (x=0, 2.5, 7.5 at%) were made at a heating rate ${\beta}=10^{\circ}C/min$ in the range $T=35^{\circ}C{\sim}950^{\circ}C$. The as-measured TG curves confirm that $Bi_xSe_{100-x}$ samples were thermally stable with minor loss at $T{\leq}400^{\circ}C$ and mass loss starts to decrease up to $600^{\circ}C$, beyond which trivial mass loss was observed. These TG curves were used to estimate molar (Se/Bi)-ratios of $Bi_xSe_{100-x}$ samples, which were not in accordance with initial composition. Shaping features of conversion curves ${\alpha}(T)-T$ of $Bi_xSe_{100-x}$ samples combined with a reliable flow chart were used to reduce kinetic mechanisms that would have caused their thermal mass loss to few nth-order reaction models of the form $f[{\alpha}(T)]{\propto}[1-{\alpha}(T)]^n$ (n=1/2, 2/3, and 1). The constructed ${\alpha}(T)-T$ and $(d{\alpha}(T)/dT)-T$ curves were analyzed using Coats-Redfern (CR) and Achar-Brindley-Sharp (ABS) kinetic formulas on basis of these model functions, but the linearity of attained plots were good in a limited ${\alpha}(T)-region$. The applicability of CR and ABS methods, with model function of kinetic reaction mechanism R0 (n=0), was notable as they gave best linear fits over much broader ${\alpha}(T)-range$.