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Karimi, Mohammad Reza,Fathi, Shima,Ghanavati, Farzin The Korean Academy of Prosthodonitics 2015 The Journal of Advanced Prosthodontics Vol.7 No.1
PURPOSE. The purpose of this research was to evaluate the amount of reosseointegration after counter torquing (reverse torque) and transposing the installed implants at different times. MATERIALS AND METHODS. This study was done on ten tibiae of five cross-bred dogs. At the first day one implant was installed in each tibia. After one week half of the implants were randomly counter torqued (1WCT) and the other half were explanted and reimplanted in a new juxtaposition site (transposed)(1WT). At the same time three new implants were installed in each dog, one of them was considered as one week control (1WC) and remaining two as 8 week groups (8WCT&8WT). After eight weeks the 1WCT and 1WT implants were loosened by counter torque and the quantity of needed force for liberation was measured with the digital device (BGI). At the same time one implant was installed in each dog as eight week control (8WC) and the same protocol was repeated for 8 week groups after another 8 weeks. RESULTS. All implants were osseointegrated. Mean quantities of osseointegration in case groups indicated better amounts rather than control groups. CONCLUSION. Counter torque or transposition of the installed implants one week or eight weeks after the implantation did lead to osseointegration.
Protective factors of marital stability in long-term marriage globally: a systematic review
Reza Karimi,Maryam Bakhtiyari,Abbas Masjedi Arani 한국역학회 2019 Epidemiology and Health Vol.41 No.-
OBJECTIVES: In recent decades, due to the high prevalence of divorce in numerous countries and the detrimental aftermath thereof, it has become increasingly important to study the components of marital stability. The current study explored fundamental protective factors in long-term marriage through a systematic review. METHODS: Searches for relevant publications were conducted in Embase, Web of Science, PubMed, Scopus, Science Direct, Magiran, and Scientific Information Database from their inception through January 30, 2019. Through the keyword search, 1,706 articles were found, of which 25 articles remained after screening based on the eligibility criteria. RESULTS: The extracted protective factors associated with marital stability in long-term marriage were classified as interpersonal and intrapersonal. Notable extracted factors included spirituality and religion, commitment, sexual relationship, communication, children, love and attachment, intimacy, and conflict resolution approach. These findings show that some aspects of relationships, such as commitment, act to preserve the pillars of marriage in critical situations, while other aspects, such as intimacy, help to construct marital identity and satisfaction. CONCLUSIONS: The identified components of marital stability are structures that enhance a couple’s identity and sense of togetherness. Identifying the specific aspects of marital relationships that contribute to marital stability may help specialists and researchers to target specific types of marital interaction that may enhance the happiness and longevity of relationships, thereby preventing avoidable divorces.
Karimi, Khatoon,Mahmoudi, Touraj,Karimi, Negar,Dolatmoradi, Hesamodin,Arkani, Maral,Farahani, Hamid,Vahedi, Mohsen,Parsimehr, Elham,Dabiri, Reza,Nobakht, Hossein,Asadi, Asadollah,Zali, Mohammad Reza Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.9
Background: Several epidemiological studies have shown associations between colorectal cancer (CRC) risk and type 2 diabetes and obesity. Any effects would be expected to be mediated through the insulin pathway. Therefore it is possible that variants of genes encoding components of the insulin pathway play roles in CRC susceptibility. In this study, we hypothesized that polymorphisms in the genes involving the insulin pathway are associated with risk of CRC. Materials and Methods: The associations of four single nucleotide polymorphisms (SNPs) in IGF-I (rs6214), IGFBP-3 (rs3110697), INSR (rs1052371), and IRS2 (rs2289046) genes with the risk of CRC were evaluated using a case-control design with 167 CRC cases and 277 controls by the PCR-RFLP method. Results: Overall, we observed no significant difference in genotype and allele frequencies between the cases and controls for the IGF-I, IGFBP-3, INSR, IRS2 gene variants and CRC before or after adjusting for confounders (age, BMI, sex, and smoking status). However, we observed that the IRS2 (rs2289046) GG genotype compared with AA+AG genotypes has a protective effect for CRC in normal weight subjects (p=0.035, OR=0.259, 95%CI= 0.074-0.907). Conclusions: These findings do not support plausible associations between polymorphic variations in IGF-I, IGFBP-3, INSR, IRS2 genes and risk of CRC. However, the evidence for a link between the IRS2 (rs2289046) variant and risk of CRC dependent on the BMI of the subjects, requires confirmation in subsequent studies with greater sample size.
Optimized Local Relocation for VLSI Circuit Modification Using Mean-Field Annealing
Gholam Reza Karimi,Ahmad Azizi Verki,Sattar Mirzakuchaki 한국전자통신연구원 2010 ETRI Journal Vol.32 No.6
In this paper, a fast migration method is proposed. Our method executes local relocation on a model placement where an additional module is added to it for modification with a minimum number of displacements. This method is based on mean-field annealing (MFA), which produces a solution as reliable as a previously used method called simulated annealing. The proposed method requires substantially less time and hardware, and it is less sensitive to the initial and final temperatures. In addition, the solution runtime is mostly independent of the size and complexity of the input model placement. Our proposed MFA algorithm is optimized by enabling module rotation inside an energy function called permissible distances preservation energy. This, in turn, allows more options in moving the engaged modules. Finally, a three-phase cooling process governs the convergence of problem variables called neurons or spins.
Relationship between university brand personality and student behavioral loyalty
Mohammad Reza Karimi Alavijeh,Morteza Rezaee,Vahid Hosseinabadi 한국교육개발원 2014 KEDI Journal of Educational Policy Vol.11 No.2
The brand personality and status of the university among other universities are important for encouraging students to choose a particular university. This study examines different dimensions of the university brand personality and the effect of brand personality on the student-university relationship, student loyalty, and the moderating role of ethics on the research model. The sample of the first study includes all the students of public universities of Tehran city, and for the second study all the students of University of Tehran. 403 and 399 completed surveys were collected for the first and second studies. The results of an exploratory factor analysis show that the university brand personality has six dimensions with twenty-two scales. The results of structural equation modeling show that the university brand personality has a positive and meaningful effect on student-university relations, the relationship between student and university and the likelihood of students recommending the university to others, and the willingness to continue academic study. Ethics has a moderating role, but its effect and intensity are not meaningful.
Hamid Reza Karimi,Huijun Gao 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.3
The H∞ synchronization problem of the master and slave structure of a second-order neutral master-slave systems with time-varying delays is presented in this paper. Delay-dependent sufficient conditions for the design of a delayed output-feedback control are given by Lyapunov-Krasovskii method in terms of a linear matrix inequality (LMI). A controller, which guarantees H∞ synchroniza-tion of the master and slave structure using some free weighting matrices, is then developed. A numeri-cal example has been given to show the effectiveness of the method. The simulation results illustrate the effectiveness of the proposed methodology.
Hamid Reza Karimi,Boris Lohmann,Christof Buskens 대한전기학회 2007 International Journal of Control, Automation, and Vol.5 No.2
This paper presents a delay-dependent approach to robust filtering for linear parameter-varying (LPV) systems with discrete and distributed time-invariant delays in the states and outputs. It is assumed that the state-space matrices affinely depend on parameters that are measurable in real-time. Some new parameter-dependent delay-dependent stability conditions are established in terms of linear matrix inequalities (LMIs) such that the filtering process remains asymptotically stable and satisfies a prescribed H∞ performance level. Using polynomially parameter-dependent quadratic (PPDQ) functions and some Lagrange multiplier matrices, we establish the parameter-independent delay-dependent conditions with high precision under which the desired robust H∞ filters exist and derive the explicit expression of these filters. A numerical example is provided to demonstrate the validity of the proposed design approach.
Hamid Reza Karimi 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.4
In this paper, the problem of robust synchronization and fault detection for a class of master-slave systems subjected to some nonlinear perturbations and mixed neutral and discrete time-varying delays is investigated based on an H∞ performance condition. By introducing a descriptor technique, using Lyapunov-Krasovskii functional and a suitable change of variables, new required sufficient conditions are established in terms of delay-dependent linear matrix inequalities to synthesize the residual generation scheme. The explicit expression of the synchronization law is derived for the fault such that both asymptotic stability and a prescribed level of disturbance attenuation are satisfied for all admissi-ble nonlinear perturbations. A numerical example with simulation results illustrates the effectiveness of the methodology.
Observer-Based Mixed H₂/H<SUB>∞</SUB> Control Design for Linear Systems with Time-Varying Delays
Hamid Reza Karimi 대한전기학회 2008 International Journal of Control, Automation, and Vol.6 No.1
This paper presents a convex optimization method for observer-based mixed H₂/H∞ control design of linear systems with time-varying state, input and output delays. Delay-dependent sufficient conditions for the design of a desired observer-based control are given in terms of linear matrix inequalities (LMIs). An observer-based controller which guarantees asymptotic stability and a mixed H₂/H∞ performance for the closed-loop system of the linear system with time-varying delays is then developed. A Lyapunov-Krasovskii method underlies the observer-based mixed H₂/H∞ control design. A nwnerical example with simulation results illustrates the effectiveness of the methodology.