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Capacity Performance Analysis of M-ary PPM TH-UWB Systems in the Presence of Narrowband Interference
Kokkalis, Nikos V.,Mathiopoulos, P. Takis,Karagiannidis, George K.,Koukourlis, Christos S. The Korea Institute of Information and Commucation 2008 Journal of communications and networks Vol.10 No.3
The capacity of ultra-wideband (UWB) systems in presence of narrowband interference (NBI) is studied. By appropriately modifying the Shannon capacity formula, an analytical expression for the capacity of M-ary pulse position modulation (PPM) signals in the presence of NBI is obtained. Performance evaluation results for the capacity of such signals as a function of the NBI carrier frequency and power are also presented.
BIOFUNCTIONALIZATION OF PET/SiO_2 SURFACES FOR SINGLE MOLECULE EXPERIMENTS AND MEDICAL APPLICATIONS
ALEXANDROS KATRANIDIS,ALEXANDROS MELACHROINOS,PANAGIOTIS G. KARAGIANNIDIS,SYLVIE LOUSINIAN,GEORGIOS PAPADOPOULOS,STERGIOS LOGOTHETIDIS,THEODORA CHOLI-PAPADOPOULOU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.3
PET/SiO2 layers were chemically modified to maintain immobilization of functional single molecules. GFP molecules provide an ideal system due to their stability and intrinsic fluorescence. GFP in vivo biotinylated within its NH2-terminal region and attached on the substrate via the biotin–streptavidin bond was further investigated with confocal microscopy, atomic force microscopy (AFM) and spectroscopic ellipsometry (SE). AFM revealed monolayered donut-like structures representing assemblies of biotin–streptavidin–biotin–GFP immobilized onto PET/SiO_2 surfaces via mPEG. In particular, regions with an approximate height of 12 nm, which approaches the molecular dimensions of the above complex given by molecular modeling, could be detected. The dimensions of the donut-like structures suggest a close-to-each-other positioning of the GFP molecules — which, however, retain their functionality, as evidenced by confocal microscopy.
Capacity Performance Analysis of M-ary PPM TH-UWB Systems in the Presence of Narrowband Interference
Nikos V. Kokkalis,P. Takis Mathiopoulos,George K. Karagiannidis,Christos S. Koukourlis 한국통신학회 2008 Journal of communications and networks Vol.10 No.3
The capacity of ultra-wideband (UWB) systems in presence of narrowband interference (NBI) is studied. By appropriately modifying the Shannon capacity formula, an analytical expression for the capacity ofM-ary pulse position modulation (PPM) signals in the presence of NBI is obtained. Performance evaluation results for the capacity of such signals as a function of the NBI carrier frequency and power are also presented.
Enhancing PHY Security of Cooperative Cognitive Radio Multicast Communications
Nguyen, Van-Dinh,Duong, Trung Q.,Shin, Oh-Soon,Nallanathan, Arumugam,Karagiannidis, George K. IEEE 2017 IEEE transactions on cognitive communications and Vol.3 No.4
<P>In this paper, we propose a cooperative approach to improve the security of both primary and secondary systems in cognitive radio multicast communications. During their access to the frequency spectrum licensed to the primary users, the secondary unlicensed users assist the primary system in fortifying security by sending a jamming noise to the eavesdroppers, while simultaneously protect themselves from eavesdropping. The main objective of this paper is to maximize the secrecy rate of the secondary system, while adhering to all individual primary users’ secrecy rate constraints. In the case of active eavesdroppers and perfect channel state information (CSI) at the transceivers, the utility function of interest is nonconcave and the involved constraints are nonconvex, and thus, the optimal solutions are troublesome. To solve this problem, we propose an iterative algorithm to arrive at least to a local optimum of the original nonconvex problem. This algorithm is guaranteed to achieve a Karush–Kuhn–Tucker solution. Then, we extend the optimization approach to the case of passive eavesdroppers and imperfect CSI knowledge at the transceivers, where the constraints are transformed into a linear matrix inequality and convex constraints, in order to facilitate the optimal solution.</P>
Busschaert, Nathalie,Park, Seong-Hyun,Baek, Kyung-Hwa,Choi, Yoon Pyo,Park, Jinhong,Howe, Ethan N. W.,Hiscock, Jennifer R.,Karagiannidis, Louise E.,Marques, Igor,Fé,lix, Ví,tor,Namkung, Wan Nature Publishing Group 2017 Nature chemistry Vol.9 No.7
<P>Perturbations in cellular chloride concentrations can affect cellular pH and autophagy and lead to the onset of apoptosis. With this in mind, synthetic ion transporters have been used to disturb cellular ion homeostasis and thereby induce cell death; however, it is not clear whether synthetic ion transporters can also be used to disrupt autophagy. Here, we show that squaramide-based ion transporters enhance the transport of chloride anions in liposomal models and promote sodium chloride influx into the cytosol. Liposomal and cellular transport activity of the squaramides is shown to correlate with cell death activity, which is attributed to caspase-dependent apoptosis. One ion transporter was also shown to cause additional changes in lysosomal pH, which leads to impairment of lysosomal enzyme activity and disruption of autophagic processes. This disruption is independent of the initiation of apoptosis by the ion transporter. This study provides the first experimental evidence that synthetic ion transporters can disrupt both autophagy and induce apoptosis.</P>