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Game theory-based attack and defense analysis in virtual wireless networks with jammers and eavesdroppers

Digital Communications and Networks 2021年第3期7卷 327-334页

作者： bassma s.alsulami Chandra Bajracharya Danda B.Rawat Department of Electrical Engineering and Computer science Howard UniversityWashingtonDC20059USA Department of Electrical Engineering Capitol Technology UniversityLaurelMD20708USA

Dynamic spectrum sharing and cognitive radio networks were proposed to enhance the Radio Frequency(RF)spectrum ***,there are several challenges to realize them in real systems,such as sensing uncertainty causing issues to licensed users,business models for licensed service *** virtualization is regarded as a technology that leverages service level agreements to sublease unused or underutilized RF spectrum that addresses aforementioned issues and helps to significantly enhance the utilization of the RF spectrum,offer improved coverage and capacity of networks,enhance network security and reduce energy *** wireless virtualization,wireless networks'physical substrate is shared and reconfigured dynamically between virtual wireless networks through Mobile Virtual Network Operations(MVNOs).Wireless virtualization with dynamic configurable features of Wireless Infrastructure Providers(WIPs),virtualized wireless networks are vulnerable to a multitude of attacks,including jamming attacks and eavesdropping *** paper investigates a means of defense through the employment of coalition game theory when jammers try to degrade the signal quality of legitimate users,and eavesdroppers aim to reduce secrecy ***,we consider a virtual wireless network where MVNO users'job is to improve their signal to Interference plus Noise Ratio(sINR)while the jammers target to collectively enhance their Jammer Received signal strength(JRss),and an eavesdropper's goal is to reduce the overall secrecy *** results have demonstrated that the proposed game strategies are effective(in terms of data rate,secrecy rate and latency)against such attackers compared to the traditional approaches.

关键词： Game theory based security Virtual wireless networks Jamming and eavesdropping

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Pathological conditions predisposing to infertility and gynaecological neoplasia

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World Journal of Obstetrics and Gynecology 2014年第2期3卷 28-34页

作者： bassma Mohamed El sabaa Department of Pathology Alexandria Faculty of Medicine Alexandria University Alexandria 21111 Egypt

some of the conditions long blamed for female factor infertility are now acknowledged as well established risk factors of gynecological neoplasia. This realization has lead to the proposition that infertility might be a risk factor for the development of several types of gynecological neoplasms. This review addresses different conditions that play a role in both infertility and gynaecological neoplasia. An intricate interplay between growth factors and hormonal factors(estrogens and progestins, androgens and gonadotropins) is said to link the state of infertility to some gynecological tumors. The relation between endometriosis-as one of the well established causes of female infertility- and ovarian cancer is well known. Endometriosis has been particularly related to endometrioid and clear-cell ovarian carcinomas. Another evidence for this association is embodied in finding endometriotic lesions adjacent to ovarian cancers. The polycystic ovary syndrome(PCOs), one of the most prevalent endocrine disorders and a long studied cause of female infertility increases the risk of endometrial carcinoma. The link between PCOs and endometrial carcinoma seems to be endometrial hyperplasia. PCOs-associated endometrial carcinoma tends to present at a younger age and early stage, with lower grade and lower risk of metastasis. Turner's syndrome and other types of ovarian dysgenesis constitutea rare cause of infertility and are known to confer a definite risk of germ cell tumors. There seems to be a link between infertility and an increased risk of gynecological neoplasia. Hence, it is important to assess the risk of malignancy in each category of infertile patients so as to provide optimal and timely intervention.

关键词： Infertility-gynecological cancer Endome-triosis Polycystic ovary syndrome Ovarian dysgenesis Endometrioid carcinoma Clear cell carcinoma Turner’s syndrome Gonadoblastoma Hyperestrogenemia

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Effect of Ciprofloxacin on *** and *** Growth in Presence of Vitamin C Using Cup Cut Diffusion Method

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Journal of Pharmacy and Pharmacology 2019年第8期7卷 473-484页

作者： suhera M. Aburawi bassma M. Doro Ebtisam A. Awad Department of Pharmacology and Clinical Pharmacy Faculty of PharmacyUniversity of Tripoli. TripoliLibya Department of Microbiology and Immunology Faculty of PharmacyUniversity of TripoliTripoliLibya

Ciprofloxacin is a second-generation of fluoroquinolone,broad-spectrum antibiotic with bactericidal activity against Gram-positive and Gram-negative *** is one of the most widely used antibiotics,because of its efficacy,safety,and relatively low *** acid(vitamin C)is water-soluble monosaccharide antioxidant;it is essentially required by the body for its various biochemical and physiological *** is Gram-positive cocci;widely distributed in the environment,it is a member of the normal flora of the *** is not always pathogenic;it is a common cause of skin infections including abscesses,respiratory infections such as sinusitis,and food *** is Gram-negative bacteria,found in the environment,foods,and *** *** strains are harmless;it is part of the normal microbiota of the ***,some serotypes of *** cause serious food poisoning in their hosts;it can cause diarrhea,while others cause urinary tract infections,respiratory illness and pneumonia,and other ***:Cup cut diffusion method was *** I:is carried out to choose the concentration of vitamin C to be used in experiment *** negative control is normal saline,added in cup in each plate,vitamin C(100 mg/mL,200 mg/mL,400 mg/mL)was added,the volume in each cup was 100μ*** II:Eight groups of treatments were *** first is the negative control(1%normal saline),the second group is the positive control of vitamin C(200 mg/mL).The third,fourth and fifth groups are ciprofloxacin with different concentrations(10 mg/mL,20 mg/mL,40 mg/mL);the sixth,seventh and eighth are the combination of vitamin C with each concentration of ciprofloxacin(10 mg/mL,20 mg/mL,40 mg/mL).Each group includes six petri *** plates were incubated at 37 oC for 24 h and 48 *** of inhibition is measured in *** and conclusion:Ciprofloxacin produces dose dependent increase in zone of inhibition of *** and *** gr

关键词： Ciprofloxacin vitamin C s.aureus E.coli cup cut diffusion method

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