A NOTE ON THE UNITS OF MANTACI-REUTENAUER ALGEBRA

Arslan, Hasan,Can, Himmet Korean Mathematical Society 2018 대한수학회보 Vol.55 No.4

In this paper, we have first presented the construction of the linear characters of a finite Coxeter group $G_n$ of type $B_n$ by lifting all linear characters of the quotient group $G_n/[G_n,G_n]$ of the commutator subgroup $[G_n,G_n]$. Also we show that the sets of distinguished coset representatives $D_A$ and $D_{A^{\prime}}$ for any two signed compositions A, A' of n which are $G_n$-conjugate to each other and for each conjugate class ${\mathcal{C}}_{\lambda}$ of $G_n$, where ${\lambda}{\in}\mathcal{BP}(n)$, the equality ${\mid}{\mathcal{C}}_{\lambda}{\cap}D_A{\mid}={\mid}{\mathcal{C}}_{\lambda}{\cap}D_{A^{\prime}}{\mid}$ holds. Finally, we have given the general structure of units of Mantaci-Reutenauer algebra.

A note on the units of Mantaci-Reutenauer algebra

Hasan Arslan,Himmet Can 대한수학회 2018 대한수학회보 Vol.55 No.4

In this paper, we have first presented the construction of the linear characters of a finite Coxeter group $G_{n}$ of type $B_{n}$ by lifting all linear characters of the quotient group $G_{n}/[G_{n},G_{n}]$ of the commutator subgroup $[G_{n},G_{n}]$. Also we show that the sets of distinguished coset representatives $D_{A}$ and $D_{A'}$ for any two signed compositions $A, A'$ of $n$ which are $G_{n}$-conjugate to each other and for each conjugate class $\mathcal{C}_{\lambda}$ of $G_{n}$, where $\lambda \in \mathcal{BP}(n)$, the equality $|\mathcal{C}_{\lambda} \cap D_{A}|=|\mathcal{C}_{\lambda} \cap D_{A'}|$ holds. Finally, we have given the general structure of units of Mantaci-Reutenauer algebra.

Survival Results and Prognostic Factors in T4 N0-3 Non-small Cell Lung Cancer Patients According to the AJCC 7^th Edition Staging System

Arslan, Deniz,Bozcuk, Hakan,Gunduz, Seyda,Tural, Deniz,Tattli, Ali Murat,Uysal, Mukremin,Goksu, Sema Sezgin,Bassorgun, Cumhur Ibrahim,Koral, Lokman,Coskun, Hasan Senol,Ozdogan, Mustafa,Savas, Burhan Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.6

Background: The American Joint Committee on Cancer (AJCC) published a new staging system ($7^{th}$ edition) in 2009. In our study, we evaluated the survival results and prognostic factors among T4 local advanced non-small cell lung cancer (LA-NSCLC) patients in a large heterogeneous group, in accordance with this new system. Materials and Methods: We retrospectively evaluated the files of 122 T4 N0-3 M0 LA-NSCLC patients, identified according to the new staging system, treated at two centers between November 2003 and June 2012. Variables correlating with univariate survival at p<0.20 were later included in multivariate Cox regression analysis. Here, selection of relevant predictors of survival was carried out in accordance with the likelihood ratio formula with p<0.05 regarded as significant. Results: The median age was 60 and the median follow-up period was 17.4 months. Median overall survival (OS) was 18.3 months, the 1 year overall survival (OS) rate was 72%, and the 5 year OS rate was 28%. Statistically significant predictors of survival were (p<0.20) ECOG-PS (Eastern Cooperative Oncology Group Performance Status), age, T4 factor subgroup, stage and primary treatment in OS univariate analysis. On multivariate analysis for OS ECOG-PS (p=0.001), diagnostic stage (p=0.021), and primary treatment (p=0.004) were significant. In the group receiving non-curative treatment, the median OS was 11.0 months, while it was 19.0 months in the definitive RT group and 26.6 months in the curative treatment group. There was a significant difference between the non-curative group and the groups which had definitive RT and curative operations (respectively p<0.001 and p=0.001) in terms of OS, but not between the groups which had definitive RT and curative operations. The median event free survival (EFS) rate was 9.9 months, with rates of 46% and 19% at 3 and 5 years, respectively. On univariate analysis of EFS rate with ECOG-PS, weight loss and staging, statistical significance was found only for thorax computerized tomography (CT)+18F-fluorodeoxy-glucose positron emission tomography-CT (PET-CT) use, stage and primary treatment (p<0.20). In multivariate analysis with EFS, only the primary treatment was statistically significant (p=0.001). In the group receiving non-curative treatment, the median EFS was 10.5 months while in the curative operation group it was 14.7 months. When all the primary treatment groups were taken into consideration, grade III/IV side effect swas observed in 57 patients (46.6%). Esophagitis was most prominent among those that received definitive radiotherapy. Conclusions: Independent prognostic factors among these 122 heterogeneous LA-NSCLC T4 N0-3 M0 patients were age at diagnosis, ECOG-PS, stage and primary treatment, the last also being a significant prognostic indicator of EFS. Our findings point to the importance of appropriate staging and a multidisciplinary approach with modern imaging methods in this patient group. In those with T4 lesions, treatment selection and the effective use of curative potential should be the most important goal of clinical care.

Unified Fault-Tolerant Control for Air-Fuel Ratio Control of Internal Combustion Engines with Advanced Analytical and Hardware Redundancies

Amin Arslan Ahmed,Mahmood-ul-Hasan Khalid 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3

This paper proposes a Unifi ed Fault-Tolerant Control System (UFTCS) based on advanced analytical and hardware redundancies for Air-Fuel Ratio (AFR) control of Spark Ignition (SI) Internal Combustion (IC) engines. The advanced analytical redundancy part is termed the Hybrid Fault-Tolerant Control System (HFTCS) which consists of both active and passive types. The Lookup Tables (LTs) have been utilized in the active part and a robust proportional feedback controller of high gain with fuel throttle actuator has been implemented in the passive part. Since the failure of any two sensors at the same time or failure of a single actuator causes engine shutdown, an advanced hardware redundancy protocol Modifi ed Triple Modular Redundancy (MTMR) has been suggested for the sensors, and Dual Redundancy (DR) has been proposed for the actuators to prevent the tripping of the engine. MATLAB/Simulink simulation results indicate that the suggested UFTCS is highly robust to the sensor faults in both normal and noisy conditions. The probabilistic reliability analysis for various hardware redundancy schemes also proves the greater overall reliability of UFTCS. Finally, a comparison with the existing AFR control systems is carried out to demonstrate its superior performance

Low-Power-Adaptive MC-CDMA Receiver Architecture

Mohd. Hasan,Tughrul Arslan,John Thompson 한국전자통신연구원 2007 ETRI Journal Vol.29 No.1

This paper proposes a novel concept of adjusting the hardware size in a multi-carrier code division multiple access (MC-CDMA) receiver in real time as per the channel parameters such as delay spread, signal-to-noise ratio, transmission rate, and Doppler frequency. The fast Fourier transform (FFT) or inverse FFT (IFFT) size in orthogonal frequency division multiplexing (OFDM)/MCCDMA transceivers varies from 1024 points to 16 points. Two low-power reconfigurable radix-4 256-point FFT processor architectures are proposed that can also be dynamically configured as 64-point and 16-point as per the channel parameters to prove the concept. By tailoring the clock of the higher FFT stages for longer FFTs and switching to shorter FFTs from longer FFTs, significant power saving is achieved. In addition, two 256 sub-carrier MC-CDMA receiver architectures are proposed which can also be configured for 64 sub-carriers in real time to prove the feasibility of the concept over the whole receiver.

Leadership styles embedded in the Turkish National Police

Aziz Ozmen,Hasan Arslan 아시아경찰학회 2006 아시아경찰학회 국제학술회의 Vol.2006 No.-

In recent years, organizations have gone through dramatic changes, including flatter and looser structures, downsizing, and horizontal approaches to information flow. On the one hand, these changes are due to rapid technological developments, global competition, and the changing nature of the workforce. On the other hand, these organizational transformations and innovations are triggered by interventions, such as total quality management and principle-based management. This new leadership formation has taken many forms in non-profit organizations, particularly in law enforcement agencies. Leadership is regarded as a critical factor in the initiation and implementation of the transformation in organizations. If leadership is to succeed in engendering a positive impact on individuals, teams, and organizations, traditional leadership paradigms, such as directive versus participative leadership, consideration versus initiating structure, autocratic versus democratic leadership, and task versus relations-oriented leadership, should be broadened (see for example, Avolio & Bass, 1998; Bass & Avolio, 1990; Conger, 1993; Ekvall & Arvonen, 1991, 1994; Puffer & McCarthy, 1996). With respect to the management of transformation processes in organizations, there is a strong need for leaders who are more change-centered. These leaders place value on the development of a clear vision and inspire followers to pursue the vision. In this way, they provide a strong motivational force for change in followers. These authors suggest that besides a participative leadership style, having a clear vision of the mission is most likely to foster innovation. Leaders who enhance followers’ confidence and skills to devise innovative responses, by being creative and taking risks can facilitate the changeover processes in organizations (Howell & Avolio, 1989). As a result of such processes, a new paradigm applied in the last two decade advocating “new leadership” theories, such as transformational and transactional leadership. As promoters of change, transformational leaders elicit performance beyond expectations by instilling pride, communicating personal respect, facilitating creative thinking, and providing inspiration (Bass, 1985; Bass & Avolio, 1993). The goal of this paper is to determine the underlying leadership structures in the Turkish National Police and, if so, by introducing transformational leadership and sticking to its foundation and tenets, to name these structures consistent with the changing roles of police managers and leaders. In this perspective, the paper argues what underlying structure exists among the thirty one variables by applying the Multifactor Leadership Questionnaire formed by Bass (Bass, 1985). A variety of research studies in the transformational literature review demonstrate that findings based on this questionnaire can identify the potential of leadership style in the Turkish National Police. Moreover, this study can be evaluated as a replication of another study, “Policing in Time of Transformation: An Examination of the Future of the Turkish Police,” conducted by this researcher in Spring and Summer, 2005. Almost the same results as those obtained in the former study demonstrate consistency and prove the reliability of data.

The Ability of the Eating Assessment Tool-10 to Detect Aspiration in Patients With Neurological Disorders

( Selen Serel Arslan ),( Numan Demir ),( Hasan E Kılınc ),( Aynur A Karaduman ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2017 Journal of Neurogastroenterology and Motility (JNM Vol.23 No.4

Background/Aims Dysphagia is common in patients with neurological disorders. There is a need to identify patients at risk early by a useful clinical tool to prevent its serious complications. The study aims to determine the ability of the Turkish version of Eating Assessment Tool-10 (T-EAT-10) to detect aspiration in patients with neurological disorders. Methods Two hundred fifty-nine patients with neurological disorders who had complaints about swallowing difficulty and referred for a swallowing evaluation were included. Oropharyngeal dysphagia was evaluated with the T-EAT-10 and videofluoroscopic swallowing study in the same day. The penetration-aspiration scale (PAS) was used to document the penetration and aspiration severity. Results The mean age of the patients was 59.72 ± 17.24 years (minimum [min] = 18, maximum [max] = 96), of which 57.1% were male. The mean T-EAT-10 of patients who had aspiration (PAS > 5) was 25.91 ± 10.31 (min = 1, max = 40) and the mean T-EAT-10 of patients who did not have aspiration (PAS < 6) was 15.70 ± 10.54 (min = 0, max = 40) (P < 0.001). Patients with a T-EAT-10 score higher than 15 were 2.4 times more likely to aspirate. A linear correlation was found between T-EAT-10 and PAS scores of the patients (r = 0.416, P < 0.001). The sensitivity of a T-EAT-10 higher than 15 in detecting aspiration was 81.0% and the specificity was 58.0%. A T-EAT-10 score of higher than 15 has a positive predictive value of 72.0% and a negative predictive value of 69.0%. Conclusion The T-EAT-10 can be used to detect unsafe airway protection in neurology clinics to identify and refer dysphagic patients for further evaluation. (J Neurogastroenterol Motil 2017;23:550-554)

Effects of Trimetazidine on T Wave Alternans in Stable Coronary Artery Disease

Mehmet Yaman,Uğur Arslan,Hasan Ali Gümrükçüoğlu,Musa Şahin,Hakkı Şimşek,Serkan Akdağ 대한심장학회 2016 Korean Circulation Journal Vol.46 No.3

Background and Objectives: Studies reveal that the microvolt T wave alternans (MTWA) test has a high negative predictive value forarrhythmic mortality among patients with ischemic or non-ischemic cardiomyopathy. In this study, we investigate the effects oftrimetazidine treatment on MTWA and several echocardiographic parameters in patients with stable coronary artery disease. Subjects and Methods: One hundred patients (23 females, mean age 55.6±9.2 years) with stable ischemic heart disease were included inthe study group. Twenty-five age- and sex-matched patients with stable coronary artery disease formed the control group. All patientswere stable with medical treatment, and had no active complaints. Trimetazidine, 60 mg/day, was added to their current treatment for aminimum three months in the study group and the control group received no additional treatment. Pre- and post-treatment MTWAvalues were measured by 24 hour Holter testing. Left ventricular systolic and diastolic functions were assessed by echocardiography. Results: After trimetazidine treatment, several echocardiographic parameters related with diastolic dysfunction significantly improved. MTWA has been found to be significantly improved after trimethazidine treatment (63±8 μV vs. 53±7 μV, p<0.001). Abnormal MTWA waspresent in 29 and 11 patients pre- and post-treatment, respectively (p< 0.001). Conclusion: Trimetazidine improves MTWA, a non-invasive determinant of electrical instability. Moreover, several echocardiographic parametersrelated with left ventricular functions also improved. Thus, we can conclude that trimetazidine may be an effective agent to prevent arrhythmiccomplications and improve myocardial functions in patients with stable coronary artery disease.

Lack of Prognostic Value of Blood Parameters in Patients Receiving Adjuvant Radiotherapy for Breast Cancer

Cihan, Yasemin Benderli,Arslan, Alaettin,Cetindag, Mehmet Faik,Mutlu, Hasan Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.10

Aim: To determine prognostic value of blood parameters on overall and progression-free survival in cases received adjuvant radiotherapy and chemotherapy with diagnosis of stage I-III breast cancer. Materials and Methods: We retrospectively reviewed files of 350 patients with non-metastatic breast cancer who were treated in the Radiation Oncology Department of Kayseri Teaching Hospital between 2005 and 2010. Pretreatment white blood cell (WBC), neutrophil, monocyte, basophil and eosinophil counts, and the neutrophil/lymphocyte ratio (NLR) and platelet lymphocyte ratio (PLR) were recorded. The relationship between clinicopathological findings and blood parameters was assessed. Results: Overall, 344 women and 6 men were recruited. Median age was $55.3{\pm}0.3$ years (range: 22-86). Of the cases, 243 (61.4%) received radiotherapy while 329 (94.3%), received chemotherapy and 215 (61.4%) received hormone therapy. Mean overall survival (OS) and progression-free survival (PFS) was 84.4 and 78.8 months, respectively. During follow-up, 48 patients died due to either disease-related or non-related causes. Local recurrence was detected in 14 cases, while distant metastasis was noted in 45 cases. In univariate analysis, age, pathology, perinodal invasion were significantly associated with overall survival, whereas gender, stage and hormone therapy were significantly associated with progression-free survival. In multivariate analysis, histopathological diagnosis (OR: 0.3; 95%: 0.1-0.7; p=0.006) and perinodal invasion (OR: 0.1; 95% CI: 0.1-1.3; p=0.026) were significantly associated with overall survival, whereas tumor stage (OR: 2.1; 95% CI: 0.0-0.7; p=0.014) and hormone therapy (OR: 2.1; 95%: 1.2-3.8; p=0.010) were significantly associated with progression-free survival. Conclusions: It was found that serum inflammatory markers including WBC, neutrophil, lymphocyte and monocyte counts, and NLR and PLR had no effect on prognosis in patients with breast cancer who underwent surgery and received adjuvant radiotherapy and chemotherapy.

Oral Cyclophosphamide and Etoposide in Treatment of Malignant Pleural Mesothelioma

Gunduz, Seyda,Mutlu, Hasan,Goksu, Sema Sezgin,Arslan, Deniz,Tatli, Ali Murat,Uysal, Mukremin,Coskun, Hasan Senol,Bozcuk, Hakan,Ozdogan, Mustafa,Savas, Burhan Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.20

Background: Malignant mesothelioma (MM) is almost always fatal and few treatment options are available. The aim of this study was to evaluate the efficacy of oral cyclophosphamide and etoposide for patients who underwent standard treatment for advanced MM. Materials and Methods: This study included 22 malignant pleural mesothelioma patients who were treated with oral cyclophosphamide and etoposide (EE). Results: The average follow-up period of the patients was 39.1 months. Under the treatment of oral EE, median progression-free survival was 7.7 months [95%CI HR (4.3-11.1)] and median overall survival was 28.1 months [95%CI HR (5.8-50.3)]. The treatment response rates were as follows: 4 patients (27.3%) had a partial response (PR), 12 (54.5%) had stable disease (SD), and progressive disease (PD) was observed in 6 (35.9%). Conclusions: Oral EE can be administered effectively to patients with inoperable malignant mesothelioma who had previously received standard treatments.