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Interference Priority: A New Scheme for Prioritized Resource Allocation in Wireless
Lozano, Angel,Biglieri, Ezio,Alrajeh, Nabil The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.5
A standard paradigm for the allocation of wireless resources in communication demands symmetry, that is, all users are assumed to be on equal footing and hence get equal shares of the system's communication capabilities. However, there are situations in which "prime users" should be given priority, as for example in the transmission of emergency messages. We examine prioritization policies that could be implemented at the physical layer and propose a new one, termed interference priority (IP), which is shown to have excellent performance. We evaluate the performance of these prioritization techniques both in controlled settings and within the context of a full cellular system and discuss the impact of prioritized use of resources on the unprioritized users.
Interference Priority: A New Scheme for Prioritized Resource Allocation in Wireless
Angel Lozano,Ezio Biglieri,Nabil Alrajeh 한국통신학회 2012 Journal of communications and networks Vol.14 No.5
A standard paradigm for the allocation of wireless resources in communication demands symmetry, that is, all users are assumed to be on equal footing and hence get equal shares of the system’s communication capabilities. However, there are situations in which “prime users” should be given priority, as for example in the transmission of emergency messages. We examine prioritization policies that could be implemented at the physical layer and propose a new one, termed interference priority (IP), which is shown to have excellent performance. We evaluate the performance of these prioritization techniques both in controlled settings and within the context of a full cellular system and discuss the impact of prioritized use of resources on the unprioritized users.
Miguel Angel Garcia Rangel,Adrian Manzanilla,Angel Eduardo Zamora Suarez,Filiberto Muñoz,Sergio Salazar,Rogelio Lozano 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.3
This research work focuses on the design of a robust-adaptive control algorithm for a 4DOF Unmanned Underwater Vehicle (UUV). The proposed strategy is based in a Non-Singular Terminal Sliding Mode Control (NTSMC) with adaptive gains, where the proposed adaptation mechanism ensures that the gains remain bounded. In this control strategy a non-singular terminal sliding surface is proposed to obtain a faster convergence of the tracking errors. The NTSMC ensures Practical Finite-Time Stability for the closed-loop system as well as exhibits a chattering reduction. In order to demonstrate the satisfactory performance of the proposed controller, a set of experiments was performed with a Non-singular Terminal Sliding Mode Controller and an Adaptive Non-Singular Terminal Sliding Mode Control (ANTSMC) in real time for trajectory tracking in the X-Y plane, the graphs showed that the ANTSMC converges faster to a smaller region and reduces oscillations.
Prioritized Resource Allocation in Wireless Spectrum Pooling
Biglieri, Ezio,Lozano, Angel,Alrajeh, Nabil The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.5
A standard paradigm for the allocation of wireless resources in communication demands symmetry, whereby all users are assumed to be on equal footing and hence get equal shares of communication capabilities. However, there are situations in which "prime users" should be given higher priority, as for example in the transmission of emergency messages. In this paper, we examine a prioritization policy that can be implemented at the physical layer. In particular, we evaluate the performance of a prioritized transmission scheme based on spectrum pooling and on the assignment of higher signal-to-noise ratio channels to higher-priority users. This performance is compared to that of unprioritized (or "symmetric") schemes, and the impact of prioritization on the unprioritized users is discussed.
Prioritized Resource Allocation inWireless Spectrum Pooling
Ezio Biglieri,Angel Lozano,Nabil Alrajeh 한국통신학회 2012 Journal of communications and networks Vol.14 No.5
A standard paradigm for the allocation of wireless resources in communication demands symmetry, whereby all users are assumed to be on equal footing and hence get equal shares of communication capabilities. However, there are situations in which “prime users” should be given higher priority, as for example in the transmission of emergency messages. In this paper, we examine a prioritization policy that can be implemented at the physical layer. In particular, we evaluate the performance of a prioritized transmission scheme based on spectrum pooling and on the assignment of higher signal-to-noise ratio channels to higher-priority users. This performance is compared to that of unprioritized (or “symmetric”)schemes, and the impact of prioritization on the unprioritized users is discussed.
( Yasser Hessen Abdou ),( Maria Angeles Perez Martinez ),( Natalia Pinlla Echevarri ),( Maria Thiscal Lopez Lluva ),( Fernando Lozano Ruiz Poveda ),( Ignacio Sanchez Perez ),( Miguel Angel Rienda More 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
A 36 year-old man was referred to our hospital for the evaluation of an abnormal shadow on the cardiac apex on a chest X-ray fi lm.He denied systemic disease such as hypertension or diabetes mellitus and had no history of specifi c conditions, such as Kawasaki`s disease, chest trauma or connective tissue disorder. He had no subjective symptoms. His blood pressure was 120/75 mmHg and pulse rate was 70 beats/min. On physical examination, continuous murmur of a grade II/VI was audible at 4th left intercostal space. The results of other physical examination and blood test were normal. A Chest X-ray showed a radio-opaque shadow at the apex. An echocardiography was arranged and a round sac of 4x4 cm located in the apex, as well as a double-chamber right ventricle was observed Contrast echocardiography with Sonovue showed the fi lling of the vascular sac with contrast then partial fi lling of the distal RV apex. The abnormal vascular sac was connected from the left side to a vascular structure that looks to be coronary artery and from the right side to the distal part of a double right ventricle apex with a bi-directional shunt (fi stula). It also demonstrates the high velocity and centrifuge nature of blood fl ow in the vascular sac. Chest CT showed a LAD ectasia with a 4x4 cm saccular aneurysm at the distal portion of LAD Cardiac MRI revealed a giant left descending coronary artery distal aneurysm attached to a double apex right ventricle Coronary angiography revealed a dilated LAD with a huge saccular coronary aneurysm at its distal portion. The patient refused surgical correction for the coronary aneurysm and fi stula. He was discharged and has been followed up for more than 1 year without cardiovascular events.
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성종근,Yongbing ZHUANG,이원희,도유성,Angel E. LOZANO,Michael D. GUIVER,이영무 한국막학회 2018 한국막학회 총회 및 학술발표회 Vol.2018 No.11
In this study, Tröger’s Base (TB) chemistry is exploited to introduce tunable microporosity in commercially available polyimide membranes. Considering that TB is a rigid, V-shaped and bridged alicyclic amine, there have been notable reports on accessing feasibility in TB for gas separation membrane applications. However, this presentation shows a different but much viable preparation approach in comparison to the already reported ones. This approach only requires commercially available monomers with two preparation steps, thus it can accommodate scalable and practical productions. Five different kinds of homopolymers and six copolymers were explored to demonstrate structure-property-performance relationships and to evaluate practical applicability towards industrial level.
( Alvaro G. Morales Taboada ),( Jose Manuel Asencio Pascual ),( Pablo Lozano Lominchar ),( Jose Angel Lopez Baena ),( Enrique Velasco ),( Luis Rodriguez-bachiller ),( Benjamin Diaz Zorita ),( Arturo C 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: To analyze the impact of multimodal treatment strategy with neoadjuvant chemotherapy and intraoperative radiation therapy (IORT), on overall median survival in patients with pancreatic cancer. Methods: We analyzed 128 patients, from 1995 to 2016, who underwent multimodal treatment with and without neoadjuvant chemotherapy, surgery and intraoperative radiation therapy (IORT). The patients were stratified in two groups based in multimodality therapy. The data analyses were carried out using the chi-squared test, and the median survival was estimated according to the Kaplan-Meier method. Results: The mean age was 65 years, 71 men (55%) and 58 women (45%), the mean follow-up was 32.5 months with a median of 15.5 months. 19.5% received complete treatment and 41 patients were also treated with IORT, 23 patients (56.1%) were treated as part of the multimodal treatment versus 18 (43.9%), P=<0.001). The overall survival was 57.90 +/- 12.59 months for the neoadjuvant treatment group compared to 39.05 +/- 6.76 months in the control group without neoadjuvant treatment, (P=0, 05). IORT vs Not IORT was 62.05 +/- 13.34 months VS 38.65 +/- 6.58 months, P=0.027 respectively. Conclusions: Neoadjuvant and local therapy with intraoperative radiation therapy (IORT) are feasible strategies and associated with a longer overall median survival.
Andrews, Jeffrey G.,Buzzi, Stefano,Choi, Wan,Hanly, Stephen V.,Lozano, Angel,Soong, Anthony C. K.,Zhang, Jianzhong Charlie IEEE 2014 IEEE journal on selected areas in communications Vol.32 No.6
<P>What will 5G be? What it will <I>not</I> be is an incremental advance on 4G. The previous four generations of cellular technology have each been a major paradigm shift that has broken backward compatibility. Indeed, 5G will need to be a paradigm shift that includes very high carrier frequencies with massive bandwidths, extreme base station and device densities, and unprecedented numbers of antennas. However, unlike the previous four generations, it will also be highly integrative: tying any new 5G air interface and spectrum together with LTE and WiFi to provide universal high-rate coverage and a seamless user experience. To support this, the core network will also have to reach unprecedented levels of flexibility and intelligence, spectrum regulation will need to be rethought and improved, and energy and cost efficiencies will become even more critical considerations. This paper discusses all of these topics, identifying key challenges for future research and preliminary 5G standardization activities, while providing a comprehensive overview of the current literature, and in particular of the papers appearing in this special issue.</P>
Zhuang, Yongbing,Seong, Jong Geun,Do, Yu Seong,Lee, Won Hee,Lee, Moon Joo,Cui, Zhaoliang,Lozano, Angel E.,Guiver, Michael D.,Lee, Young Moo unknown 2016 Chemical communications Vol. No.
<P>A facile two-step synthesis beginning with commercial monomers to prepare copolyimides by Troger's Base (TB) formation provides membranes for the first time with tunable gas transport relative to hydrogen separations, CO2 plasticization resistance, and good mechanical and thermal properties.</P>