{"title":"A monitoring system for people living with Alzheimer's disease","authors":"Irene-Maria Tabakis, M. Dasygenis, M. Tsolaki","doi":"10.1109/PACET.2017.8259985","DOIUrl":"https://doi.org/10.1109/PACET.2017.8259985","url":null,"abstract":"Neurodegenerative diseases affect millions of people worldwide, and Alzheimer's disease is one of the most common types. Alzheimer's disease and other dementias have a deep impact not only to those who are diagnosed but also on the people who are close to them and society as a whole. Various researchers and companies have proposed products that aid towards relief for these people. We noticed that there are plenty of products, which are targeting to patients' safety, although there is a gap: there is no link between the products and the needs of caregivers, while at the same time most of the products do not protect sufficiently patient' s personal data. We designed a complete system to monitor and record patient's locations, heart rate and sleep which organizes the way that the caregivers comprehend and satisfy patient's needs. In this paper, we present a monitoring system for people living with Alzheimer's disease. This system consists of a wearable and an Android application. It can be used from every involving actors. Our system developed thanks to the close and constant communication with patients and their caregivers in an outpatient clinic for dementia and memory loss by a team of engineers and doctors. The evaluation results lead to rate the significance of our system.","PeriodicalId":171095,"journal":{"name":"2017 Panhellenic Conference on Electronics and Telecommunications (PACET)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129424627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lazaros Spyridopoulos, Nikos Konofaos, Theodoras Simopoulos, G. Alexiou
{"title":"Crossbar sector addressing scheme on SRAMs","authors":"Lazaros Spyridopoulos, Nikos Konofaos, Theodoras Simopoulos, G. Alexiou","doi":"10.1109/PACET.2017.8259951","DOIUrl":"https://doi.org/10.1109/PACET.2017.8259951","url":null,"abstract":"Typical memory addressing, where a row of cells that forms the memory word, is addressed every time the memory is accessed, has the disadvantage of decreased addressing flexibility, originating from the strict addressing method and leading to addressing limitations. In this work we present and implement the crossbar addressing scheme, where the memory is addressed in a two dimensional way, using two decoders on each direction. Although crossbar addressing is mentioned on references there is no known implementation on SRAM memories. We extend this scheme proposing the new Sector addressing scheme, based on crossbar addressing.","PeriodicalId":171095,"journal":{"name":"2017 Panhellenic Conference on Electronics and Telecommunications (PACET)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116381658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The MapReduce application of matrix multiplication implemented on field programmable gate arrays","authors":"Michail-Antisthenis I. Tsompanas, G. Sirakoulis","doi":"10.1109/PACET.2017.8259986","DOIUrl":"https://doi.org/10.1109/PACET.2017.8259986","url":null,"abstract":"Data intensive computations in data centers are performed by an increasingly popular programming framework named MapReduce. An advantage of this framework is that the algorithm is divided into simple tasks that enables the exploitation of its parallelism. A great variety of processing elements architectures, such as shared memory systems, clusters of computers and heterogeneous systems, have accommodated applications of the MapReduce framework in order to enhance its robustness and efficiency. Field Programmable Gate Arrays (FPGAs) are known for implementing algorithms while providing higher parallelism compared to their software counterparts. The mapping of a MapReduce framework on specialized hardware is proposed here. The proposed FPGA architecture is using a pipeline principle in order to alleviate the need of large memory resources. The proposed system was analyzed implementing a basic application, namely matrix multiplication.","PeriodicalId":171095,"journal":{"name":"2017 Panhellenic Conference on Electronics and Telecommunications (PACET)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121997005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"SIMO PPM optical wireless communication system over gamma turbulence channels with generalized pointing errors","authors":"M. P. Ninos, H. Nistazakis, G. Tombras, C. Volos","doi":"10.1109/PACET.2017.8259982","DOIUrl":"https://doi.org/10.1109/PACET.2017.8259982","url":null,"abstract":"In this work, the performance of a free-space optical communication system using spatial diversity on the receiver's side with optimal combining, is studied. The information signal is conveyed using the L-PPM scheme and the proposed wireless optical system is assumed to be hampered by the atmospheric turbulence effect modeled by the Gamma distribution and the misalignment fading modeled by the recently launched generalized pointing error model. Novel analytical closed-form expressions are derived for the average bit error rate (BER) estimation for such a communication system. Using the derived mathematical expressions, numerical results are illustrated for various turbulence conditions, different pointing error cases and receivers' diversity configurations.","PeriodicalId":171095,"journal":{"name":"2017 Panhellenic Conference on Electronics and Telecommunications (PACET)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132472619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A toolset for the design of embedded systems, enabling HW/SW co-simulation, performance optimisation and source code generation","authors":"Michael Loupis","doi":"10.1109/PACET.2017.8259981","DOIUrl":"https://doi.org/10.1109/PACET.2017.8259981","url":null,"abstract":"In the context of MODUS project, several tools were developed for SMEs, to be used in their development process for different application domains. In this paper, the overview of the architecture of each one of these tools is presented, as included in the final version of the MODUS toolset and a use case scenario is presented.","PeriodicalId":171095,"journal":{"name":"2017 Panhellenic Conference on Electronics and Telecommunications (PACET)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125324464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nikolaos Georgoulopoulos, Alkiviadis A. Hatzopoulos
{"title":"Real number modeling of a flash ADC using SystemVerilog","authors":"Nikolaos Georgoulopoulos, Alkiviadis A. Hatzopoulos","doi":"10.1109/PACET.2017.8259969","DOIUrl":"https://doi.org/10.1109/PACET.2017.8259969","url":null,"abstract":"Real Number Modeling (RNM) is the process of modeling an analog circuit's behavior as signal flow model. This means that every output of an analog component is sampled, in a discrete manner, from the inputs and the internal state. The model detects an event and decides the time to carry out a computation. A SystemVerilog behavioral real number model for a 3-bit flash analog-to-digital converter (ADC) is presented, in order to improve simulation efficiency. The ADC model simulation time completes in only 1.23s, which can be utilized effectively in high-frequency applications. The proposed model is compared to three different models: a transistor-level flash ADC, a Verilog-A ADC model and a Verilog-AMS with wreal ADC model. 65nm CMOS technology library was used for the flash ADC designs in Cadence Virtuoso. The simulation runs took place in Spectre (for transistor-level SPICE model) and AMS Simulator (for SystemVerilog, Verilog-A and Verilog-AMS with wreal). In all cases, the presented SystemVerilog model displays reduced simulation run time, in comparison with the other models, along with satisfying accuracy.","PeriodicalId":171095,"journal":{"name":"2017 Panhellenic Conference on Electronics and Telecommunications (PACET)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120930913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Kyriakos, I. Patronas, G. Tzimas, V. Kitsakis, D. Reisis
{"title":"Realizing virtual output queues in high throughput data center nodes","authors":"A. Kyriakos, I. Patronas, G. Tzimas, V. Kitsakis, D. Reisis","doi":"10.1109/PACET.2017.8259971","DOIUrl":"https://doi.org/10.1109/PACET.2017.8259971","url":null,"abstract":"Contemporary Data Center designs involve optical switches and Top-of-Rack (ToR) switches to connect thousands of servers. Most often ToR switches include Virtual Output Queues (VOQs) to alleviate the effect of the head-of-line blocking problem and improve the network's performance. The design of the VOQs has to minimize the latency in frame transmission and to keep the implementation cost, which includes buffers and the organization overhead, at relatively low level. The current paper focuses on a data center operating with Time Division Multiple Access (TDMA) method and presents a VOQ architecture placed at the input of the ToR switch supporting 10GEthernet port. The VOQ architecture consists of a limited number of queues corresponding to the active destinations of each input port, which forward the Ethernet frames to a shared buffer. A low latency efficient mechanism assigns the active destinations to the queues. This work is part of a complete ToR design that is developed with a commercial Ethernet switch, a Xilinx Virtex VC707 and a Xilinx NetFPGA boards. The VOQs are realized and validated on the NetFPGA board.","PeriodicalId":171095,"journal":{"name":"2017 Panhellenic Conference on Electronics and Telecommunications (PACET)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125204444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Laboratory jitter removal circuit for single-bit all-digital frequency synthesis","authors":"A. Raptakis, Costas Oustoglou, P. Sotiriadis","doi":"10.1109/PACET.2017.8259964","DOIUrl":"https://doi.org/10.1109/PACET.2017.8259964","url":null,"abstract":"All-digital frequency synthesizers based on sigma-delta modulation with single-bit output can have exceptionally high dynamic range and spurs-free dynamic range, in simulation. The performance of their FPGA implementations however is significantly limited by the jitter introduced by the FPGA and its clock reference, which is translated to phase noise. This paper introduces a laboratory circuit architecture for suppressing the FPGA and reference jitter in order to achieve spectrally cleaner single-bit output sequences and demonstrate the achievable performance of the all-digital frequency synthesizers. The proposed architecture is based on a 1-Bit DAC re-clocking the singlebit digital output of the FPGA using one of the two low-jitter clocks generated by a low phase noise reference oscillator. The second clock is used to clock the FPGA after passing through a programmable delay line and a small-value frequency divider. The implementation of the circuit's architecture is presented discussing the design challenges. Phase noise measurements demonstrate the performance of the circuit. Spectral measurements illustrate the effectiveness of jitter removal in the case of a sigma-delta modulator single-bit output.","PeriodicalId":171095,"journal":{"name":"2017 Panhellenic Conference on Electronics and Telecommunications (PACET)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127970352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Conductivity distribution measurement at different low frequencies using a modular 64 electrode electrical impedance tomography system","authors":"Christos Dimas, P. Sotiriadis","doi":"10.1109/PACET.2017.8259973","DOIUrl":"https://doi.org/10.1109/PACET.2017.8259973","url":null,"abstract":"Electrical Impedance Tomography (EIT) is a technique that is widely spread in applications in biomedical engineering. The purpose of EIT is to use a sinusoidal current rather than the traditional methods of tomography where radiation or ultrasound waves are used. In this work, a system architecture using 64-electrodes applied to a circular liquid setup is implemented as well as a test circuitry to verify the system operation. Moreover, measurements are taken at a low-frequency range and their results are presented and compared.","PeriodicalId":171095,"journal":{"name":"2017 Panhellenic Conference on Electronics and Telecommunications (PACET)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131003310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Efficient all-digital frequency synthesizer based on multi-step look-ahead sigma-delta modulation","authors":"Nikos Temenos, Charis Basetas, P. Sotiriadis","doi":"10.1109/PACET.2017.8259967","DOIUrl":"https://doi.org/10.1109/PACET.2017.8259967","url":null,"abstract":"An all-digital frequency synthesizer system architecture with single-bit digital output generating frequency signals while shaping the quantization noise outside of the useful frequency range is presented. The system uses two identical low-pass single-bit Multi-Step Look-Ahead Sigma-Delta modulators (MSLA SDMs) in a quadrature (I-Q) configuration driven by two multi-bit digital orthogonal sinusoidal signals generated by a direct digital synthesizer (DDS). MSLA SDMs operate in the baseband and their outputs are interleaved and frequency up-converted to generate the desirable high-frequency output signal. The system architecture and the hardware complexity of it are parametrized on the number of look ahead steps, the Over Sampling Ratio (OSR) and the filter's order of the MSLA SDMs as well as on the balance between OSR, desirable frequency range span and Signal to Noise and Distortion Ratio (SNDR).","PeriodicalId":171095,"journal":{"name":"2017 Panhellenic Conference on Electronics and Telecommunications (PACET)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114974661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}