TOTAL DOMINATION NUMBER OF CENTRAL GRAPHS

Kazemnejad, Farshad,Moradi, Somayeh Korean Mathematical Society 2019 대한수학회보 Vol.56 No.4

Let G be a graph with no isolated vertex. A total dominating set, abbreviated TDS of G is a subset S of vertices of G such that every vertex of G is adjacent to a vertex in S. The total domination number of G is the minimum cardinality of a TDS of G. In this paper, we study the total domination number of central graphs. Indeed, we obtain some tight bounds for the total domination number of a central graph C(G) in terms of some invariants of the graph G. Also we characterize the total domination number of the central graph of some families of graphs such as path graphs, cycle graphs, wheel graphs, complete graphs and complete multipartite graphs, explicitly. Moreover, some Nordhaus-Gaddum-like relations are presented for the total domination number of central graphs.

Total domination number of central graphs

Farshad Kazemnejad,Somayeh Moradi 대한수학회 2019 대한수학회보 Vol.56 No.4

Let $G$ be a graph with no isolated vertex. \emph{A total dominating set}, abbreviated TDS of $G$ is a subset $S$ of vertices of $G$ such that every vertex of $G$ is adjacent to a vertex in $S$. \emph{The total domination number} of $G$ is the minimum cardinality of a TDS of $G$. In this paper, we study the total domination number of central graphs. Indeed, we obtain some tight bounds for the total domination number of a central graph $C(G)$ in terms of some invariants of the graph $G$. Also we characterize the total domination number of the central graph of some families of graphs such as path graphs, cycle graphs, wheel graphs, complete graphs and complete multipartite graphs, explicitly. Moreover, some Nordhaus-Gaddum-like relations are presented for the total domination number of central graphs.

Trend Analysis of Gastrointestinal Cancer Incidences in Guilan Province: Comparing Rates over 15 Years

Atrkar-Roushan, Zahra,Kazemnejad, Anoshirvan,Mansour-Ghanaei, Fariborz,Zayeri, Farid Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12

Background: Cancers of gastric and esophagus are the most frequent gastrointestinal (GI) tract cancers in Iran. This study aimed to analyze time trends of GI tract cancers in Guilan province by gender and age to provide solid scientific evidence for cancer prevention and control. Materials and Methods: The data were obtained from the Guilan Cancer Registry System and Guilan Provincial Health Center, over the 15 year period between 1997 and 2011. Crude incidence and age standardized (AS)incidence rates were calculated and annual percent change was estimated by Joinpoint software for long term trend analysis. Results: During the study period, 8,332 cases of GI malignances with a male to female ratio of 1:1.73 were registered in Guilan province. The AS rates for esophageal, gastric, colon and rectal cancers were 5.97, 14.5, 7.59 and 3.58 per 105 respectively. While the trend was declining and relatively constant for esophageal and gastric cancer, respectively, the incidence trend for colon and rectal cancers was of increase over the period of the study. Conclusions: The results indicated that the incidence of GI cancers was relatively low in Guilan province compared to neighboring provinces. An effective cancer control program including prevention measures, early detection and effective treatment needs to be implemented to reduce cancer morbidity and mortality.

Horizontal instability after acromioclavicular joint reduction using the two-hole technique is preferred over the loop technique: a single-blind randomized clinical trial

Mohsen Mardani-Kivi,Kamran Asadi,Ehsan Kazemnejad Leili,Keyvan Hashemi-Motlagh,Amin Izadi,Mona Pishgahpour,Zohre Darabipour 대한견주관절학회 2022 대한견주관절의학회지 Vol.25 No.3

Background: Most acromioclavicular joint (ACJ) injuries are caused by direct trauma to the shoulders, and various methods and techniques are used to treat them; however, none of the options can be considered the gold standard. This study examines the horizontal stability of the ACJ after a complete dislocation was repaired using one of two Ethibond suture techniques, the loop technique and the two holes in the clavicle technique. Methods: In this single-blind, randomized clinical trial, 104 patients diagnosed with complete ACJ dislocation type V were treated using Ethibond sutures with either the loop technique or the two holes in the clavicle technique. Horizontal changes in the ACJ were radiographically assessed in the lateral axial view, and shoulder function was evaluated by the Constant (CS) and Taft (TS) scores at intervals of 3, 6, and 12 months after surgery. Results: The horizontal stability of the ACJ was better with the two-hole technique than the loop technique at all measurement times. CS and TS changes showed a significant upward trend over time with both techniques. The mean CS and TS at the final visit were 95.2 and 11.6 with the loop technique and 94.0 and 11.9 with the two-hole technique, respectively. The incidence of superficial infections caused by the subcutaneous pins was the same in the two groups. Conclusions: Due to the improved ACJ stability with the two-hole technique, it appears to be a more suitable option than the loop technique for AC joint reduction.

Work-Related Low Back Pain Treatment: A Randomized Controlled Trial from Tehran, Iran, Comparing Multidisciplinary Educational Program versus Physiotherapy Education

Leila Ghadyani,Sedigheh Sadat Tavafian,Anoshirvan Kazemnejad,Joan Wagner 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.4

Study Design: Clinical trial. Purpose: To compare the multidisciplinary educational program versus physiotherapy education among Iranian nurses. Overview of Literature: Low back pain (LBP) can accompany significant occupational injuries in the nursing profession. There is no agreement on the most effective educational practice. Methods: This study was conducted from August 17, 2014 to September 22, 2014 in Tehran, Iran. Eligible nurses with chronic mechanical LBP (n=136) were classified into an intervention group (n=66) or the control group (n=70). The intervention group received physiotherapy education for 120-minutes followed by a 120-minute health education session based on predictive constructs of social cognitive theory (SCT). The control group received the 120-minute physiotherapy education. Disability rate, pain severity and back pain prevention behavior were measured at initially and 3 months after intervention using visual analogue scale, Roland-Morris disability questionnaire and nursing low back pain preventive behaviors questionnaire. Results: The two groups were the same in terms of all studied variables at the initiation of the study. At the 3-month follow up, predictive constructs of LBP preventive behaviors of participants in the intervention were improved (p <0.001). Significant decreases were evident at 3 months in pain severity (p =0.03) and disability (p =0.003). Conclusions: The designed multidisciplinary educational intervention could decrease chronic mechanical LBP in nurses.

Development and Psychometric Evaluation of Nursing Low Back Pain Predictor Questionnaire Focusing on Nurses Suffering from Chronic Low Back Pain in Iran

Leila Ghadyani,Sedigheh Sadat Tavafian,Anoshirvan Kazemnejad,Joan Wagner 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.4

Study Design: Development and psychometric evaluation. Purpose: Design and psychometric assessment of the Nursing Low Back Pain Predictor Questionnaire addressing nurses suffering from chronic low back pain in Iran. Overview of Literature: Low back pain is the most prevalent behavior-related health problem among nurses, and it needs to be assessed through a validated multi-factorial questionnaire, using the premises of the social cognitive theory. Methods: This was a cross-sectional study carried out in Tehran, Iran from April 17, 2014 to July 16, 2014. A 50-item questionnaire based on the social cognitive theory was generated. The questionnaire was distributed among 500 nurses working in hospitals located in different geographically areas in Tehran. Exploratory factor analysis was used to determine the factors and their related items. Cronbach’s alpha was calculated to assess reliability. Results: The exploratory factor analysis loaded six factors, named observational learning, outcome expectations, self-efficacy, self-regulation, and self-efficacy in overcoming impediments in the working environment and emotional coping. All factors were jointly accounted for 67.12% of behavior change variance. The Cronbach’s alpha coefficient showed excellent internal consistency (alpha=0.91). Test and retest analysis with 2-week intervals indicated an appropriate stability for the questionnaire (intraclass correlation coefficient=0.94). Conclusions: According the results, the developed questionnaire is a reliable and validated theory-based instrument, which can be used to predict the work, related factors for low back pain among nurses.

Effectiveness of Multidisciplinary Group-Based Intervention versus Individual Physiotherapy for Improving Chronic Low Back Pain in Nursing Staff: A Clinical Trial with 3- and 6-Month Follow-Up Visits from Tehran, Iran

Leila Ghadyani,Sedigheh Sadat Tavafian,Anoshirvan Kazemnejad,Joan Wagner 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.3

Study Design: Clinical trial. Purpose: To evaluate the effectiveness of a multidisciplinary group-based intervention on improving pain and disability among Iranian nurses with chronic low back pain in Tehran, Iran. Overview of Literature: Although low back pain (LBP) is one of the most important health problems, the challenge remains on how to find an effective intervention to reduce pain and related disabilities. Methods: Overall, 136 eligible nurses with chronic mechanical LBP were classified into two groups. The intervention group (n=66 participants) participated in a physiotherapy educational program (for 120 minutes) plus a health educational program based on predictive constructs of the social cognitive theory (for 120 minutes). These interventions were delivered by a physiotherapist and a health education specialist. The control group (n=70 participants) participated in a physiotherapy educational program (for 120 minutes). Disability rate, pain severity, and back pain prevention behavior were measured initially and at 3- and 6-month follow-up visits using the visual analogue scale, Roland-Morris Disability, and Nursing Low Back Pain Preventive Behaviors Questionnaire. Data were analyzed by SPSS ver. 16. Results: There were statistically significant differences between the two groups in the main outcome measures immediately after the educational program and at 3- and 6-month follow-up visits. Preventive behaviors of participants in the intervention group were improved at 3- and 6- month follow-up visits (p <0.001). The mean scores of predictive constructs regarding LBP preventive behaviors in the intervention group were improved after 3 and 6 months (p <0.001). Finally, in the intervention group, pain severity and disability were decreased significantly. Conclusions: This study showed that a multidisciplinary educational program intervention can be an effective approach for reducing LBP and related disabilities among nurses.

Iranian Nurses' Readiness Toward Research Utilization

Neda Mehrdad,Mahvash Salsali,Anooshiravan Kazemnejad 한국간호과학회 2009 한국간호과학회 학술대회 Vol.2009 No.10

Qualified sperm selection based on the rheotaxis and thigmotaxis in a microfluidic system

Nima Ahmadkhani,Maryam Saadatmand,Somaieh Kazemnejad,MohammadJafar Abdekhodaie 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.4

Microfluidic systems with the ability to mimic the female reproductive tract (FRT) and sperm features have emerged aspromising methods to separate sperm with higher quality for the assistant reproductive technology. Thereby, we designed andfabricated a microfluidic system based on FRT features with a focus on rheotaxis and thigmotaxis for passive sperm separation. In this regard, four various geometries (linear, square, zigzag, and sinusoidal) were designed, and the effect of rheotaxisand thigmotaxis were investigated. Although separated sperm in all microchannels were 100% motile, non-linear geometrieswere more effective than linear geometry in the term of separating the progressive sperm with high quality. In the presenceof upstream flow, periodical changes in the slope of walls (in non-linear geometries) give rise to the periodical facing spermwith a high flow rate in the middle of microchannels, which was a reason for the high quality of separated sperm. However,because of sharp corners in the square and zigzag microchannels that create dead zones with a lack of upstream flow, whichis noticeable via simulation results, these geometries have obstacles against sperm swimming toward the outlet, whichwas proved by image analysis. The sinusoidal geometry showed the highest enhancement level of the designed geometriescompared to the linear geometry. Separated sperm exhibited 34.7% normal morphology, 100% motility, and 100% viabilityin the sinusoidal geometry. Therefore, the periodic change in the position of sperm from one wall to another wall can be astrategy for separating sperm with high quality.

Rotator cuff repair with or without proximal end detachment for long head of the biceps tendon tenodesis

Mardani-Kivi, Mohsen,Asadi, Kamran,Izadi, Amin,Leili, Ehsan Kazemnejad Korean Shoulder and Elbow Society 2022 대한견주관절의학회지 Vol.25 No.2

Background: Rotator cuff tears cause pathologies of the long head of the biceps tendon (LHBT). One of the surgical treatments for such a tear is LHBT tenodesis to the humerus. This study aims to compare simultaneous rotator cuff repair and LHBT tenodesis with or without detachment of the proximal end of the LHBT (PELHBT) from its site of adhesion to the glenoid. Methods: This retrospective study involved patients affected by LHBT pathology with rotator cuff tear. The patients were divided into two groups, with or without PELHBT detachment from the glenoid. Therapeutic outcomes were investigated by evaluation of patient satisfaction, pain based on visual analog scale, shoulder function based on Constant score and simple shoulder test, and biceps muscle strength based on the manual muscle testing grading system before surgery, at 6 months, and at the final visit after surgery. Results: Groups 1 and 2 comprised 23 and 26 patients, respectively, who showed no significant differences in demographic characteristics (p>0.05). Shoulder function, biceps muscle strength, pain, and satisfaction rate improved over time (p<0.05) but were not significantly different between the two groups (p>0.05). No post-surgical complication was found in either group. Conclusions: There was no difference in final outcomes of tenodesis with or without detachment of the PELHBT from the supraglenoid tubercle. Such tendon detachment is not necessary.