The conventional polyphase architecture for linear-phase finite impulse response (FIR) filter loses its coefficient symmetry property due to the inefficient arrangement of the filter coefficients among its subfilters. Although, existing polyphase structures can avail the benefits of coefficient symmetry property, at the cost of versatility and complex subfilters arrangement of the conventional polyphase structure. To address these issues, in this paper, we first present the mathematical expressions for inherent characteristics of the conventional polyphase structure. Thereafter, we use these expressions to develop a generalized mathematical framework which exploits coefficient symmetry by retaining the direct use of conventional FIR filter coefficients. Further, the transfer function expressions for the proposed Type-1/ transposed Type-1 polyphase structures using coefficient symmetry are derived. The proposed structures can reduce the requirement of multiplier units in polyphase FIR filters by half. We also demonstrate the decimator design using the proposed Type-1 polyphase structure and the interpolator design using the proposed transposed Type-1 polyphase structure. Moreover, the phase and magnitude characteristics of the proposed Type-1/transposed Type-1 polyphase structures are presented. It is revealed via numerical examples that all subfilters of the proposed symmetric polyphase structure possess linear-phase characteristics. INDEX TERMS Coefficient symmetry, frequency response, polyphase FIR structures, pre/post processing, sampling rate conversion.
Context:Suicide is a disease and a global public health problem. Suicidology has come to become a topic of study for intervention and research. The serotonin (5-hydroxytryptamine [5HT]) system has remained a prime area of investigation. The neurons and platelets display structural and functional similarities. Ninety-nine percent of 5HT is contained in platelets, which shares similar 5HT uptake and release mechanisms with 5HT neurons.Aims:This study aims to study human self-destructive behavior (HSDB).Objectives:Exploring the biological (serotonin levels in platelets) and psychological aspects (impulsivity) of attempted suicide or HSDB.Settings and Design:Thirty-one patients, above the age of 18 years, with a recent history of HSDB, were studied and given an International Classification of Diseases-10 diagnosis, after a detailed interview.Subjects and Methods:For the platelet 5HT estimation, blood samples were collected, and enzyme immunometric assay carried out. Detailed assessment of the impulsivity was done by the 25-item structured diagnostic interview for borderlines by Zanarini et al.Statistical Analysis Used:We obtained both categorical and continuous data. Chi-square test, Fisher's test, Student's t-test, and Pearson's product moment correlation were used.Results:Female subjects outnumbered males by 2:1. Major depression, adjustment disorder, personality disorder were predominant diagnoses. The mean platelet serotonin concentration for males = 57.3 ng/ml, that of females = 56.05 ng/ml (P > 0.05). Platelet 5HT levels were found to be negatively correlated with impulsivity scores (P < 0.05).Conclusions:Platelet serotonin levels in our study sample were quite low when compared with those reported in published literature. Low serotonin levels were inversely related to impulsivity, but only in males.
Background: Depression is found to be common among patients with diabetes and it is associated with poor outcomes in disease control. Mani objective of the study was to study the prevalence and occurrence of depression and anxiety in patients of type 2 diabetes mellitus (T2DM). Materials:115 adults with T2DM without prior diagnosis of depression and 115 matched controls were evaluated. Sociodemographic and relevant clinical variables were collected. They were evaluated for depression and anxiety using Hamilton Depression Rating Scale and Hamilton Anxiety Rating Scale respectively. Results: Significantly larger proportion of diabetic patients had depression [32 (27.8%) vs. 11 (9.57%), P = 0.005), anxiety (38 (33%) vs. 16 (13.9%, P = 0.005) and comorbid depression and anxiety (28 (24.3%) vs. 10 (8.7%), P = 0.005) as compared to healthy controls. The prevalence rate of depression was higher in age between 41 and 60 years (18.8% vs. 7.6%, respectively) in diabetic and healthy control group. Diabetic women had higher depression (21.2% vs. 8.7%) and anxiety (18.8% vs. 9.7%) than men. Depression was found significantly associated with retinopathy 28.6% (p=0.005), nephropathy 16.3% (p=0.005) and ischemic heart disease (IHD) 17.2% (p=0.005) in the present study. Comorbid depression and anxiety was significantly associated with age (40-60 years), obesity (BMI ≥ 25 kg/m2), poor glycemic control (≥7.5%), insulin therapy, nephropathy, neuropathy, and IHD but no significant association was found with education level. Conclusion: This study found a high proportion of depression and anxiety among patients with T2DM. Public health measures are required to create more awareness for managing depression in diabetes. Disclosure N. Kumar: None. A. K. Chandra: None. S. Ahsan: None. A. Kumar: None.
The objective of the study is to empirically examine the various components of subjective well-being (SWB) and its role in the association between personality and contextual performance (CP). To validate the proposed model, Indian executives from various organizations were surveyed with a survey method. The sample response from 809 respondents has been analysed with the assistance of the partial least squares (PLS) structural equation modelling (SEM) approach. The results from the study establish SWB as a mediator between personality and CP. A positive association is observed with specific components of personality factors and SWB and CP. Organizations can also learn from the study that increasing the SWB of employees is one of the important parameters for their CP.
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