| 21. |
- Amin, Yasar, et al.
(författare)
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Two-arm Sinuous Antenna for RFID Ubiquitous Sensors and Wireless Applications
- 2012
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Ingår i: Journal Electromagnetic Waves and Applications. - UK : Taylor & Francis. - 0920-5071 .- 1569-3937. ; 26:17-18, s. 2365-2371
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Tidskriftsartikel (refereegranskat)abstract
- For the first time, two-arm planar sinuous antenna is demonstrated to realize the emerging concept of integrating RFID functionalities along with sensors and other wireless applications for "green" electronics. In-depth, parametric analysis is performed for the proposed antenna which is fabricated on a paper substrate using revolutionary inkjet printing technology to develop a system-level solution for ultra-low-cost mass production of multipurpose wireless tags in an approach that could be easily expanded to other microwave and wireless "cognition" applications. The proposed antenna exhibits excellent performance throughout several RFID ISM bands and for other wireless applications in its operational range from 0.8 to 3.0 GHz.
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| 22. |
- Ansari, Muhammad Adeel, et al.
(författare)
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Diode based charge pump design using 0.35μm technology
- 2010
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Ingår i: 28th Norchip Conference, NORCHIP 2010. - : IEEE. - 9781424489732 ; , s. 5669437-
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Konferensbidrag (refereegranskat)abstract
- A high voltage charge pump design is being presented in this paper. The design is based on Dickson charge pump, constructed with diodes by using AMS 0.35μm technology. The innovation is made in Dickson charge pump i.e. charge control PMOS transistor is used in each stage of charge pump. PMOS transistor is used in series with charging capacitor which reduces the power consumption during the clock transition by controlling the time constant of each stage. The resistance between drain to source of PMOS transistor increases the time constant during the charging of the capacitor placed in each stage of charge pump. The output voltage of about 5.693V is achieved by the six stages of Dickson charge pump at no-load which reduces to 5.537V with the six stages of proposed charge pump but the power during the input clock transition is reduced from 340.5μw (consumed by Dickson charge pump) to 28.85 μW (consumed by the proposed modified charge pump). Some other results are also discussed in this paper, which are achieved on different load resistances.
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| 23. |
- Bao, D., et al.
(författare)
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A smart catheter system for minimally invasive brain monitoring
- 2015
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Ingår i: Proceedings of the International Conference on Biomedical Electronics and Devices. - : SciTePress. - 9789897580710 ; , s. 198-203
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Konferensbidrag (refereegranskat)abstract
- This paper demonstrates a smart catheter system with intracranial pressure (ICP) and temperature sensing capability which is designed for real-time monitoring in traumatic brain injury (TBI) therapy. It uses a single flexible catheter with a 1 mm (3 Fr) diameter that integrates electrodes and sophisticated silicon chip on flexible substrates, enabling multimodality monitoring of physiological signals. A micro-electromechanical-system (MEMS) catheter pressure sensor is mounted on the distal end. It can be used for detecting both pressure and temperature by different switch configurations, which minimizes the size of catheter and reduces the cost. The interconnects (signalling conductors) are printed on a bio-compatible flexible substrate, and the sensor is interfaced with an embedded electronic system at the far-end. The electronic system consists of analog front end with analog-to-digital converter (ADC), a microcontroller, and data interface to the hospital infrastructure with a graphical user interface (GUI). The overall smart catheter system achieves a pressure sensing root mean square error (RMSE) of ±1.5 mmHg measured from 20 mmHg to 300 mmHg above 1 atm and a temperature sensing RMSE of ±0.08°C measured from 32°C to 42°C. The sampling rate can be up to 10S/s. The in vivo performance is demonstrated in laboratory animals.
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| 24. |
- Cao, Yuexin, et al.
(författare)
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Minimal Control Placement of Turing's Model Using Symmetries
- 2023
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Ingår i: 2023 62nd IEEE Conference on Decision and Control, CDC 2023. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 1456-1461
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Konferensbidrag (refereegranskat)abstract
- In this paper, the minimal control placement prob-lem for Turing's reaction-diffusion model is studied. Turing's model describes the process of morphogens diffusing and reacting with each other and is considered as one of the most fundamental models to explain pattern formation in a devel-oping embryo. Controlling pattern formation artificially has gained increasing attention in the field of development biology, which motivates us to investigate this problem mathematically. In this work, the two-dimensional Turing's reaction-diffusion model is discretized into square grids. The minimal control placement problem for the diffusion system is investigated first. The symmetric control sets are defined based on the symmetry of the network structure. A necessary condition is provided to guarantee controllability. Under certain circumstances, we prove that this condition is also sufficient. Then we show that the necessary condition can also be applied to the reaction-diffusion system by means of suitable extension of the symmetric control sets. Under similar circumstances, a sufficient condition is given to place the minimal control for the reaction-diffusion system.
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| 25. |
- Cao, Yuexin, et al.
(författare)
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Network Controllability of Turing Reaction and Diffusion Model
- 2022
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Ingår i: 2022 41St Chinese Control Conference (Ccc). - : IEEE. ; , s. 259-264
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Konferensbidrag (refereegranskat)abstract
- In this paper, the controllability problem of the reaction-diffusion (RD) model, or Turing model is studied. Turing model provides a valuable framework for self-organized system and has been widely used to explain to pattern formation in the real life. With the rapidly development of the biology technology, biologists are trying to control the pattern formation artificially and has achieved some progress. However, the influence that exerted on the pattern formation by the external factors, such as light and temperature, remains to be solved. In this work, The RD model is obtained following the assumptions in Turing's original paper and spatially discretized into square grids. The nodes in the outermost layer are considered as candidates for control. Controllability of the RD system with all such nodes as control is first shown. Then controllability of the RD system with minimal number of control nodes is studied. Our results show that nearly 87.5% control nodes can be saved while the system is still controllable. Numerical simulations are provided to demonstrate the effects of controlling the reaction and diffusion of the morphogens.
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| 26. |
- Chen, Jian, et al.
(författare)
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The Design of All-Digital Polar Transmitter based on ADPLL and Phase Synchronized Delta Sigma Modulator
- 2012
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Ingår i: IEEE Journal of Solid-State Circuits. - : IEEE Solid-State Circuits Society. - 0018-9200 .- 1558-173X. ; 47:5, s. 1154-1164
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Tidskriftsartikel (refereegranskat)abstract
- An improved architecture of polar transmitter (TX) is presented. The proposed architectureis digitally-intensive and mainly composed of an all-digital PLL (ADPLL) for phasemodulation, a 1-bit low-pass delta sigma (Delta Sigma) modulator for envelop modulation, and aH-bridge class-D power amplifier (PA) for differential signaling. The (Delta Sigma) modulator isclocked using the phase modulated RF carrier to ensure phase synchronization between theamplitude and phase path, and to guarantee the PA is switching at zero crossings of theoutput current.An on chip pre-filter is used to reduce the parasitic capacitance from packages at theswitch stage output. The high over sampling ratio of the (Delta Sigma) modulator move quantizationnoise far away from the carrier frequency, ensuring good in-band performance and relax filterrequirements. The on-chip filter also acts as impedance matching and differential to singleended conversion. The measured digital transmitter consumes 58 mW from a 1 V at 6.8 dBm output power.
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| 27. |
- Chen, L., et al.
(författare)
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Process development and reliability for system-in-a-package using liquid crystal polymer substrate
- 2004
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Ingår i: Proc Electron Compon Technol Conf. ; , s. 24-28
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Konferensbidrag (refereegranskat)abstract
- In this study, embedded chip technology for system-in-a-package (SiP) application using liquid crystal polymer (LCP) substrate was developed and the reliability issue for embedded structure was evaluated. To this end two test chips with daisy chain joints were used with one copper layer. After assembly, modules were exposed to thermal cycling. The failure was investigated by SEM, and compared with finite element method (FEM) simulation results. Passive components as inductors were also fabricated on the LCP during the embedded technology. Their inductance and quality factors were simulated and discussed.
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| 28. |
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| 29. |
- Cheng, W., et al.
(författare)
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Medial reward and lateral non-reward orbitofrontal cortex circuits change in opposite directions in depression
- 2016
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Ingår i: Brain. - : Oxford University Press. - 0006-8950 .- 1460-2156. ; 139:12, s. 3296-3309
-
Tidskriftsartikel (refereegranskat)abstract
- The first brain-wide voxel-level resting state functional connectivity neuroimaging analysis of depression is reported, with 421 patients with major depressive disorder and 488 control subjects. Resting state functional connectivity between different voxels reflects correlations of activity between those voxels and is a fundamental tool in helping to understand the brain regions with altered connectivity and function in depression. One major circuit with altered functional connectivity involved the medial orbitofrontal cortex Brodmann area 13, which is implicated in reward, and which had reduced functional connectivity in depression with memory systems in the parahippocampal gyrus and medial temporal lobe, especially involving the perirhinal cortex Brodmann area 36 and entorhinal cortex Brodmann area 28. The Hamilton Depression Rating Scale scores were correlated with weakened functional connectivity of the medial orbitofrontal cortex Brodmann area 13. Thus in depression there is decreased reward-related and memory system functional connectivity, and this is related to the depressed symptoms. The lateral orbitofrontal cortex Brodmann area 47/12, involved in non-reward and punishing events, did not have this reduced functional connectivity with memory systems. Second, the lateral orbitofrontal cortex Brodmann area 47/12 had increased functional connectivity with the precuneus, the angular gyrus, and the temporal visual cortex Brodmann area 21. This enhanced functional connectivity of the non-reward/punishment system (Brodmann area 47/12) with the precuneus (involved in the sense of self and agency), and the angular gyrus (involved in language) is thus related to the explicit affectively negative sense of the self, and of self-esteem, in depression. A comparison of the functional connectivity in 185 depressed patients not receiving medication and 182 patients receiving medication showed that the functional connectivity of the lateral orbitofrontal cortex Brodmann area 47/12 with these three brain areas was lower in the medicated than the unmedicated patients. This is consistent with the hypothesis that the increased functional connectivity of the lateral orbitofrontal cortex Brodmann area 47/12 is related to depression. Relating the changes in cortical connectivity to our understanding of the functions of different parts of the orbitofrontal cortex in emotion helps to provide new insight into the brain changes related to depression.
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| 30. |
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