Passive combining network for THz phased arrays

Abstract. Power combiners play an important role in the phased array transceivers at mmWave and THz frequencies. Wilkinson combiner has been in use for a long time and is considered one of the best power combiners due to its good port isolation and low losses. In this work theoretical and simulation studies have been done to design the power combiner for sub-THz receiver front-end in the IHP 130nm SiGe process. The Wilkinson combiner designed in this work is able to provide decent performance around 300GHz frequency and shows good isolation between the input ports. The differential Wilkinson combiner has input combining port isolation of -18.2dB and reflection coefficients are around -8.5±0.5dB. While from the transmission coefficients the path loss observed is around 3.7dB. Besides this the differential Wilkinson combiner has also provided decent performance with the phase shifter testbench

Stack-run adaptive wavelet image compression

We report on the development of an adaptive wavelet image coder based on stack-run representation of the quantized coefficients. The coder works by selecting an optimal wavelet packet basis for the given image and encoding the quantization indices for significant coefficients and zero runs between coefficients using a 4-ary arithmetic coder. Due to the fact that our coder exploits the redundancies present within individual subbands, its addressing complexity is much lower than that of the wavelet zerotree coding algorithms. Experimental results show coding gains of up to 1:4dB over the benchmark wavelet coding algorithm

Proses Pemiskinan Dan Eksploitasi Sumber Daya Alam Di Desa IV Koto Setingkai

Desa penelitian studi dianostik ini adalah Desa IV Koto Setingkai yang terletak di Kecamatan Kampar Kiri dengan ibukota kecamatan di Lipat Kain dan memiliki luaswilayah sebesar 1.961,41 Km2

Civic Political Engagement of Sub-Saharan African Naturalized Immigrants

Civic political engagement is an intentional and empathic leadership behavior, especially toward engaging minorities and populations that are usually not seen and heard. Research has shown that civic political engagement helps foster better communities, people, organizations, all levels of government, and private and non-profit entities. Engaging sub-Saharan Africans as a disadvantaged population requires that they are met where they are, and because this does not happen often, they have continued to be ignored and understudied compared to other immigrant groups. This qualitative study has been an effort to see and hear sub-Saharan African stories and experiences. The study used a descriptive phenomenology approach. There were 24 participants in four focus groups to examine how sub-Saharan Africans naturalized immigrants engage in civic political processes. The study used Hanna Pitkin’s political representation theory as a lens to approach the research. In the findings, the following themes and subthemes emerged based on three research questions. The first question investigated participation, and activities and behaviors modeled emerged as the theme. Subthemes were: voting, campaign and mobilization, advocacy/activism, and volunteering. The second question examined the influence of lived experiences, and the theme was perception and attitude. The subthemes were: opportunity, resilience, representation, and fear of politics. Finally, the third question investigated motives with the theme of ubuntu (“I am because you are”). The subthemes were: collective community responsibility, and dignity and identity

The case for validating ADDIE model as a digital forensic model for peer to peer network investigation

Rapid technological advancement can substantially impact the processes of digital forensic investigation and present a myriad of challenges to the investigator. With these challenges, it is necessary to have a standard digital forensic framework as the foundation of any digital investigation. State-of-the-art digital forensic models assume that it is safe to move from one investigation stage to the next. It guides the investigators with the required steps and procedures. This brings a great stride to validate a non-specific framework to be used in most digital investigation procedures. This paper considers a new technique for detecting active peers that participate in a peer-to-peer (P2P) network. As part of our study, we crawled the μTorrent P2P client over ten days in different instances while logging all participating peers. We then employed digital forensic techniques to analyse the popular users and generate evidence within them with high accuracy. We evaluated our approach against the standard Analysis, Design, Development, Implementation, and Evaluation (ADDIE) model for the digital investigation to achieve the credible digital evidence presented in this paper. Finally, we presented a validation case for the ADDIE model using the United States Daubert Test and the United Kingdom’s Forensic Science Regulator Guidance – 218 (FSR-G-218) and Forensic Science Regulator Guidance – 201 (FSR-G-201) to formulate it as a standard digital forensic model