CROSSTALK-RESILIANT CODING FOR HIGH DENSITY DIGITAL RECORDING

Increasing the track density in magnetic systems is very difficult due to inter-track interference (ITI) caused by the magnetic field of adjacent tracks. This work presents a two-track partial response class 4 magnetic channel with linear and symmetrical ITI; and explores modulation codes, signal processing methods and error correction codes in order to mitigate the effects of ITI. Recording codes were investigated, and a new class of two-dimensional run-length limited recording codes is described. The new class of codes controls the type of ITI and has been found to be about 10% more resilient to ITI compared to conventional run-length limited codes. A new adaptive trellis has also been described that adaptively solves for the effect of ITI. This has been found to give gains up to 5dB in signal to noise ratio (SNR) at 40% ITI. It was also found that the new class of codes were about 10% more resilient to ITI compared to conventional recording codes when decoded with the new trellis. Error correction coding methods were applied, and the use of Low Density Parity Check (LDPC) codes was investigated. It was found that at high SNR, conventional codes could perform as well as the new modulation codes in a combined modulation and error correction coding scheme. Results suggest that high rate LDPC codes can mitigate the effect of ITI, however the decoders have convergence problems beyond 30% ITI

Psychological Empowerment and Its Relation with Organizational Loyalty Among First Line Managers

Psychological empowerment is an individual's belief about the meaning of their work, ability to successfully perform their tasks, sense of autonomy and their abilities to influence the work outcomes. Organizational loyalty is the employees being committed to the success of the organization and believing that working for this organization is their best option. Aim of the study: was to assess psychological empowerment and its relation with organizational loyalty among first line managers. A convenient sample of (50) head nurses participated in the study. Descriptive correlational research design was used. This research was carried out at Minia university hospital and pediatric & obstetric hospital. Data were collected by using three tools (1) Personal and clinical data questionnaire, (2) Psychological empowerment scale Spreitzer (1995) (3) Organizational loyalty scale Porter et al., (1974). The findings of the present study revealed that (46%) of the studied subjects had a high level of psychological empowerment and (44%) of them had a high level of organizational loyalty. There were strong positive statistically significant correlations between total psychological empowerment and its dimensions which include" meaning, competence, determination, and impact" and organizational loyalty among first line managers. Keywords/ Psychological empowerment/ Organizational loyalty/ First line manager

Good Codes From Generalised Algebraic Geometry Codes

Algebraic geometry codes or Goppa codes are defined with places of degree one. In constructing generalised algebraic geometry codes places of higher degree are used. In this paper we present 41 new codes over GF(16) which improve on the best known codes of the same length and rate. The construction method uses places of small degree with a technique originally published over 10 years ago for the construction of generalised algebraic geometry codes.Comment: 3 pages, to be presented at the IEEE Symposium on Information Theory (ISIT 2010) in Austin, Texas, June 201

Neonatal midgut volvulus: Spectrum of findings at color Doppler sonography

AbstractObjectiveThis study was conducted to evaluate the spectrum of findings of neonatal midgut volvulus by color Doppler sonography.Patients and methodsFrom March 2010 to December 2013, fourteen neonates was retrospectively analyzed and diagnosed as midgut volvulus. The clinical and radiological data were evaluated with special concern about the color Doppler sonography findings. The radiological data were correlated with surgical diagnosis.ResultsColor Doppler sonography found proximal bowel dilatation in 8 cases, SMA/SMV inversion of relationships in 12 cases, whirlpool sign in 13 cases and SMV dilatation was found in 10 cases. US sensitivity was 92% to diagnose midgut volvulus.ConclusionUltrasonography is an ideal examination for diagnosis of midgut volvulus and should be performed early in neonates with bilious vomiting

High-Rate Space-Time Coded Large MIMO Systems: Low-Complexity Detection and Channel Estimation

In this paper, we present a low-complexity algorithm for detection in high-rate, non-orthogonal space-time block coded (STBC) large-MIMO systems that achieve high spectral efficiencies of the order of tens of bps/Hz. We also present a training-based iterative detection/channel estimation scheme for such large STBC MIMO systems. Our simulation results show that excellent bit error rate and nearness-to-capacity performance are achieved by the proposed multistage likelihood ascent search (M-LAS) detector in conjunction with the proposed iterative detection/channel estimation scheme at low complexities. The fact that we could show such good results for large STBCs like 16x16 and 32x32 STBCs from Cyclic Division Algebras (CDA) operating at spectral efficiencies in excess of 20 bps/Hz (even after accounting for the overheads meant for pilot based training for channel estimation and turbo coding) establishes the effectiveness of the proposed detector and channel estimator. We decode perfect codes of large dimensions using the proposed detector. With the feasibility of such a low-complexity detection/channel estimation scheme, large-MIMO systems with tens of antennas operating at several tens of bps/Hz spectral efficiencies can become practical, enabling interesting high data rate wireless applications.Comment: v3: Performance/complexity comparison of the proposed scheme with other large-MIMO architectures/detectors has been added (Sec. IV-D). The paper has been accepted for publication in IEEE Journal of Selected Topics in Signal Processing (JSTSP): Spl. Iss. on Managing Complexity in Multiuser MIMO Systems. v2: Section V on Channel Estimation is update

GSU Event Portal

GSU Event portal is an application which deals with showing any post, ongoing and upcoming events on the website. From the application, user can be able to check all the events going on globally in multiple locations. This application has an option to opt for receiving the recordings of the event when registered and paid for it. This portal will display all the events in different categories such as cultural events, recreational events, ground events. This portal allows users to interact with all other registered members and get updates over the events regularly. This application will have a home page where a panel for navigation will be available for users. Through this they have the various options to go through such as organizers, admin and visitors. organizers can create or edit events, view registrations or payments, etc. The administrator panel allows admin to administer accounts, edit or delete events, review registrations, etc. In the visitor’s console visitors, can set up its profile and payment info, view log of history, etc. This application will help the user to find any kind of events with the help of location, date and name of the project. There will be front page for different types of events. Login page form already registered members and sign up option for new users. Event page to show photos and full details of event and Web map if possible. Booking process will include the payment page and confirmation. The events page will show all the upcoming events and recommended events for you

Model Predictive Control of Grid Forming Converters with Enhanced Power Quality

This paper proposes an enhanced finite control set model predictive control (FCS-MPC) strategy for voltage source converter (VSC) with a LC output filter. The proposed control scheme is based on tracking the voltage reference trajectory by using only a single-step prediction within the controller horizon. Besides, the suitability of different frequency control schemes with the proposed scheme to prevent from inherent variable switching behaviour of conventional FCS-MPC is investigated. Based on that, the proposed method targets two major factors influencing power quality in grid forming applications by enhancing the output voltage harmonic distortion and also preventing variable switching behaviour of FCS-MPC. Although compared to multi-step prediction approaches, only a single-step multi-objective cost function to improve computation efficiency is utilized, the introduced control schemes are able to deliver higher power quality compared to its counterpart methods as well. Furthermore, the effect of different applied cost functions on the transient response of the system is studied and investigated for the future use of the VSC in microgrids (MGs). The effectiveness of the proposed scheme was assessed by simulation using MATLAB/SIMULINK and experiment using a 5.5 kVA VSC module and the results were in good agreement

Min-max method for some classes of Kirchhoff problems involving the ψ \psi -Hilfer fractional derivative

In this work, we develop some variational settings related to some singular $p$-Kirchhoff problems involving the $\psi$-Hilfer fractional derivative. More precisely, we combine the variational method with the min-max method in order to prove the existence of nontrivial solutions for the given problem. Our main result generalizes previous ones in the literature

Severe hypertension in pediatric diabetic ketoacidosis – a case report and review of literature

Diabetic ketoacidosis (DKA) is a life-threatening complication of type 1 diabetes mellitus in children. Despite the presence of dehydration, hypertension occurs in a significant proportion of children with DKA. There is a lack of clarity in the literature regarding the management of hypertension in patients with paediatric DKA. Herein, we report the case of an adolescent boy who presented with DKA and severe hypertension. His neurological status was closely monitored. There was a gradual decline in his blood pressure with an improvement in the pH over the next 72 hours. The combination of severe DKA and hypertension can be a challenging clinical dilemma, especially regarding fluid management. Studies on severe DKA in children are exacting, given the rarity of this condition. A multi-centre study is suggested to provide a meaningful analysis of this aspect of DKA