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Perfect 2-Colorings of k-Regular Graphs
Piri, Farzaneh,Semnani, Saeed Mohammadian Department of Mathematics 2020 Kyungpook mathematical journal Vol.60 No.2
We study perfect 2-colorings of regular graphs. In particular, we consider the 4-regular case. We obtain a characterization of perfect 2-colorings of toroidal grids.
SOLUTIONS OF SYSTEMS OF VARIATIONAL INEQUALITIES ON FIXED POINTS OF NONEXPANSIVE MAPPINGS
Piri, Hossein Korean Mathematical Society 2014 대한수학회보 Vol.51 No.3
In this paper, we introduce a new approximating method for finding the common element of the set of fixed points of nonexpansive mappings and the set of solution of system variational inequalities for finite family of inverse strongly monotone mappings and strictly pseudo-contractive of Browder-Petryshyn type mappings. We show that the sequence converges strongly to a common element the above two sets under some parameter controling conditions. Our results improve and extend the results announced by many others.
Scaling Network Information Services to Support HetNets and Dynamic Spectrum Access
Piri, Esa,Schulzrinne, Henning The Korea Institute of Information and Commucation 2014 Journal of communications and networks Vol.16 No.2
Wireless network information services allow end systems to discover heterogeneous networks and spectrum available for secondary use at or near their current location, helping them to cope with increasing traffic and finite spectrum resources. We propose a unified architecture that allows end systems to find nearby base stations that are using either licensed, shared or unlicensed spectrum across multiple network operators. Our study evaluates the performance and scalability of spatial databases storing base station coverage area geometries. The measurement results indicate that the current spatial databases perform well even when the number of coverage areas is very large. A single logical spatial database would likely be able to satisfy the query load for a large national cellular network. We also observe that coarse geographic divisions can significantly improve query performance.
Ki-67/MIB-1 as a Prognostic Marker in Cervical Cancer - a Systematic Review with Meta-Analysis
Piri, Reza,Ghaffari, Alireza,Gholami, Nasrin,Azami-Aghdash, Saber,PourAli-Akbar, Yasmin,Saleh, Parviz,Naghavi-Behzad, Mohammad Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.16
Background: In cervical cancer patients it has been reported that there in a significant Ki-67/MIB-1 expression is correlated with survival in cervical cancer patients. However, the prognostic value is still not well understood. Materials and Methods: In the present meta-analysis the prognostic value of Ki-67/MIB-1 with regard to overall survival (OS) and disease-free survival (DFS) in cervical cancer was investigated. The databases of PubMed, ISI Web of Science, Cochrane Central Register of Controlled Trials, EMBASE, Science Direct and Wiley Online Library were used to identify appropriate literature. Results: In order to explore the relationship between Ki-67/MIB-1 and cervical cancer, we have included 13 studies covering 894 patients in the current meta-analysis. The effect of Ki-67/MIB-1 on OS for pooled random effects HR estimate was 1.63 (95%confidence interval (CI) 1.09-2.45; P<0.05). The pooled HR for DFS was 1.26 (95%CI 0.58-2.73; P>0.05) and the subgroup analysis indicated Ki-67/MIB1 was associated with DFS (HR=3.67, 95%CI 2.65-5.09) in Asians. Conclusions: According to this meta-analysis, Ki-67/MIB-1 has prognostic value for OS in patients suffering from cervical cancer. For better evaluation of the prognostic role of Ki-67/MIB-1 on DFS, studies with larger numbers of patients are needed to validate present findings in the future.
A NOTE ON MULTIPLICATIVE AND ALMOST MULTIPLICATIVE LINEAR MAPS
ANSARI-PIRI, E.,EGHBALI, N. The Honam Mathematical Society 2005 호남수학학술지 Vol.27 No.4
This note is a verification on the relations between multiplicative and almost multiplicative linear maps; and the continuity of almost multiplicative linear maps.
Domestic elder abuse and associated factors in elderly women in Tehran, Iran
Negar Piri,Koorosh Etemad 한국역학회 2018 Epidemiology and Health Vol.40 No.-
OBJECTIVES: Elderly people are often abused in many ways, with serious and lasting consequences. Elder abuse remains one of the most hidden forms of family conflict, and its frequency is anticipated to be rising in many countries that are rapidly experiencing population aging. The purpose of this study was to investigate the status of domestic elder abuse in elderly women in Tehran, Iran and to identify associated factors. METHODS: This cross-sectional study was conducted in 2017 among 260 women aged 60 and over, selected through multistage random sampling. Information on abuse and its risk factors was collected through interviews with the elderly in their homes. In order to measure domestic elder abuse, the validated Domestic Elderly Abuse Questionnaire was used. The ordinal logistic test was used in Stata version 12 to identify factors related to elder abuse. RESULTS: Overall, 90.4% of the subjects had experienced at least 1 type of abuse, among which, authority deprivation (68.5%) was the most common, and rejection (11.2%) the least common. The ordinal logistic analysis showed that the likelihood of experiencing more sever abuse was significantly higher in elderly people over 72 than in those aged 60-62 years (odds ratio, 2.07; 95% confidence interval, 1.03 to 4.17). CONCLUSIONS: Domestic elder abuse was found to be common in older women. Old age was an important risk factor for domestic elder abuse in elderly women in Tehran. Managing and preventing elder abuse is an important issue that needs to be addressed.
Solutions of systems of variational inequalities on fixed points of nonexpansive mappings
Hossein Piri 대한수학회 2014 대한수학회보 Vol.51 No.3
In this paper, we introduce a new approximating method for finding the common element of the set of fixed points of nonexpansive mappings and the set of solution of system variational inequalities for finite family of inverse strongly monotone mappings and strictly pseudo-contractive of Browder-Petryshyn type mappings. We show that the sequence converges strongly to a common element the above two sets under some parameter controling conditions. Our results improve and extend the results announced by many others.
Scaling Network Information Services to Support HetNets and Dynamic Spectrum Access
Esa Piri,Henning Schulzrinne 한국통신학회 2014 Journal of communications and networks Vol.16 No.2
Wireless network information services allow end systemsto discover heterogeneous networks and spectrumavailable for secondaryuse at or near their current location, helping them to copewith increasing traffic and finite spectrum resources. We propose aunified architecture that allows end systems to find nearby base stationsthat are using either licensed, shared or unlicensed spectrumacross multiple network operators. Our study evaluates the performanceand scalability of spatial databases storing base stationcoverage area geometries. The measurement results indicate thatthe current spatial databases perform well even when the numberof coverage areas is very large. A single logical spatial databasewould likely be able to satisfy the query load for a large nationalcellular network. We also observe that coarse geographic divisionscan significantly improve query performance.
COMPLETION OF FUNDAMENTAL TOPOLOGICAL VECTOR SPACES
ANSARI-PIRI, E. The Honam Mathematical Society 2004 호남수학학술지 Vol.26 No.1
A class of topological algebras, which we call it a fundamental one, has already been introduced generalizing the famous Cohen factorization theorem to more general topological algebras. To prove the generalized versions of Cohen's theorem to locally multilplicatively convex algebras, and finally to fundamental topological algebras, the completness of the background spaces is one of the main conditions. The local convexity of the completion of a locally convex space is a well known fact and here we have a discussion on the completness of fundamental metrizable topological vector spaces.
Ansari-Piri, Esmaeeil,Eghbali, Nasrin Korean Mathematical Society 2009 대한수학회보 Vol.46 No.2
This note is a verification on the relations between almost linear and nearly additive maps; and the continuity of almost multiplicative nearly additive maps. Also we consider the stability of nearly additive and almost linear maps.