Joint energy harvesting time allocation and beamforming in two-way relaying network

Abstract. A two-way relaying system with amplify-and-forward technique, where relay stations (RSs) acquire the energy from transmission signal and interferences, is considered. The RSs use the energy to amplify the signal received from the transmitter and forward it to the receiver. Particularly, energy harvesting (EH) and time switching (TS) are deployed. Based on the TS architecture, we divide transmission time into two time slots, which are EH phase and information transmission (IT) phase. In the EH phase, the RSs harvest the energy from the received radio frequency (RF) signal. In the IT phase, the RSs process and forward the transmission signal to the destination by energy harvesting during the EH phase. From such a transmission scheme, we investigate the optimal time ratio of the EH and IT phase as well as the beamforming at RSs in order to acquire the sum rate maximization. Since the sum-rate maximization problem is nonconvex, we develop an iterative algorithm based on the majorization-minimization (MM) technique to solve the problem. Furthermore, we deployed two schemes to overcome the self-interference to see the efficiency of each scheme related to sum-rate performance. The results show that power transmission and a number of relay station have a major impact on the sum rate performance of the two-way relay system

The effects of work-integrated learning on undergraduate sports coaching students’ perceived self-efficacy

This study examined the effects of a work-integrated learning (WIL) placement on student\u27s self-efficacy and perceived workplace skill levels. Twenty-eight participants volunteered for this study, in which 15 completed WIL and 13 did not (non-WIL). The Work Self-Efficacy Inventory (WS-Ei) and Workplace Skills Questionnaire (WSQ) were used to collect student responses. Differences between groups were analyzed using a Mann-Whitney U test, mean differences were shown, and statistical significance was set at p \u3c 0.05. Results from the WS-Ei indicated the WIL group shown significantly higher total WS-Ei scores, higher mean scores for all dimensions measured, and significantly higher scores for individual dimensions; problem-solving, politics, pressure and role expectations. The WSQ indicated the WIL group had higher mean scores for all perceived workplace skills, except for information technology, and no significant differences was observed between groups. Areas showing little difference between groups can be highlighted for further support and development

FORGOTTEN MEMORIES: RE-CONSTRUCTING THE VIETNAM WAR IN FILMS

As many scholars have written about the Vietnam War, this thesis, Forgotten Memories: Re-Constructing the Vietnam War in Films, explores a different approach to this topic by examining films. Historical films are becoming increasingly important in shaping the way the past is understood and remembered. After the war ended, many Hollywood films have continued to capture the atrocities of the war that affected the war narrative of the Vietnam War. American politics and the public suffered from the Vietnam Syndrome, and they lost confidence in the military and government structures. These emotions are translated into Hollywood films about the Vietnam War. The victory of the Gulf War in 1991 finally helped them to get out of the shadow of that psychological fear in foreign intervention. The Vietnam War films have made its comeback after the September 11th attacks. Many scholars have compared the war against terrorism is similar to the war against communism in the 1950s. Over the years, Hollywood has produced many films that are either directly about or set against the backdrop of the Vietnam War. The different representations of the Vietnam War presenting in both American and Vietnamese films produced between 1979 and 2005 explain how the film war narrative reconstruct the memory of history. By examining both American and Vietnamese films about the Vietnam War, this study calls attention to the importance of the Vietnamese experience in our understanding of the Vietnam War and brings an international perspective to the study of this subject in cultural and film studies. By identifying trends and discussing similarities and differences in film-narrative tropes across both American and Vietnamese films about the Vietnam War, this research argues that the film industry has shaped the collective memory of the Vietnam War. In doing so, Hollywood has highlighted the memorable and traumatic events that occurred during the war to construct the film narrative and generate a widespread perception of v the war. Vietnam’s government, due to the war’s destruction, made it a top priority to rebuild the economy and used films to deliver only social propaganda, expressing its gratitude and sympathy to families who lost their loved ones in the war

Chromatin status and transcription factor binding to gonadotropin promoters in gonadotrope cell lines.

BackgroundProper expression of key reproductive hormones from gonadotrope cells of the pituitary is required for pubertal onset and reproduction. To further our understanding of the molecular events taking place during embryonic development, leading to expression of the glycoproteins luteinizing hormone (LH) and follicle-stimulating hormone (FSH), we characterized chromatin structure changes, imparted mainly by histone modifications, in model gonadotrope cell lines.MethodsWe evaluated chromatin status and gene expression profiles by chromatin immunoprecipitation assays, DNase sensitivity assay, and RNA sequencing in three developmentally staged gonadotrope cell lines, αT1-1 (progenitor, expressing Cga), αT3-1 (immature, expressing Cga and Gnrhr), and LβT2 (mature, expressing Cga, Gnrhr, Lhb, and Fshb), to assess changes in chromatin status and transcription factor access of gonadotrope-specific genes.ResultsWe found the common mRNA α-subunit of LH and FSH, called Cga, to have an open chromatin conformation in all three cell lines. In contrast, chromatin status of Gnrhr is open only in αT3-1 and LβT2 cells. Lhb begins to open in LβT2 cells and was further opened by activin treatment. Histone H3 modifications associated with active chromatin were high on Gnrhr in αT3-1 and LβT2, and Lhb in LβT2 cells, while H3 modifications associated with repressed chromatin were low on Gnrhr, Lhb, and Fshb in LβT2 cells. Finally, chromatin status correlates with the progressive access of LHX3 to Cga and Gnrhr, followed by PITX1 binding to the Lhb promoter.ConclusionOur data show the gonadotrope-specific genes Cga, Gnrhr, Lhb, and Fshb are not only controlled by developmental transcription factors, but also by epigenetic mechanisms that include the modulation of chromatin structure, and histone modifications

A deep level set method for image segmentation

This paper proposes a novel image segmentation approachthat integrates fully convolutional networks (FCNs) with a level setmodel. Compared with a FCN, the integrated method can incorporatesmoothing and prior information to achieve an accurate segmentation.Furthermore, different than using the level set model as a post-processingtool, we integrate it into the training phase to fine-tune the FCN. Thisallows the use of unlabeled data during training in a semi-supervisedsetting. Using two types of medical imaging data (liver CT and left ven-tricle MRI data), we show that the integrated method achieves goodperformance even when little training data is available, outperformingthe FCN or the level set model alone

The Use of Story Map in Improving the Year Four Pupils' Ability in Reading Comprehension

This is an action research on improving reading comprehension through story map among Year 4 pupils in one of the primary schools in Malaysia. My pupils were unable to answer WH-questions of the narrative texts. The research aimed to use story map to improve pupils' reading comprehension and improve my teaching practices in reading comprehension. I am the researcher with 24 pupils, 12 males and 12 females. I utilized three data collection methods: pre-reading comprehension test and post-reading comprehension test, pupils' work and teacher's reflective journal. I introduced story map through demonstration. Then the participants completed the story through literary elements identification based on the narrative texts. Findings showed that story map helped to improve pupils' reading comprehension by identifying literary elements and relating the literary elements with the comprehension questions. The story map gave positive impact to reading comprehension. The research has impacted the teaching and learning environment, pupils' learning, and my teaching practices. I found out that story map was a useful method in attracting pupils' attention and teaching literary elements. Furthermore, I was developed to be a reflective teacher in terms of strengths and weaknesses of the teaching and learning process. Story map can be an effective tool in improving reading comprehension among pupils. In addition, a more interactive story map which incorporates Information and Communication Technology (ICT) may also be employed in further research

Performance of massive MIMO uplink with zero-forcing receivers under delayed channels

© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.In this paper, we analyze the performance of the uplink communication of massive multicell multiple-input multiple-output (MIMO) systems under the effects of pilot contamination and delayed channels because of terminal mobility. The base stations (BSS) estimate the channels through the uplink training and then use zero-forcing (ZF) processing to decode the transmit signals from the users. The probability density function (pdf) of the signal-to-interference-plus-noise ratio (SINR) is derived for any finite number of antennas. From this pdf, we derive an achievable ergodic rate with a finite number of BS antennas in closed form. Insights into the impact of the Doppler shift (due to terminal mobility) at the low signal-to-noise ratio (SNR) regimes are exposed. In addition, the effects on the outage probability are investigated. Furthermore, the power scaling law and the asymptotic performance result by infinitely increasing the numbers of antennas and terminals (while their ratio is fixed) are provided. The numerical results demonstrate the performance loss for various Doppler shifts. Among the interesting observations revealed is that massive MIMO is favorable even under channel aging conditions.Peer reviewe