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On conjugacy of maximal abelian subalgebras and the outer automorphism group of the Cuntz algebra
Conti, Roberto,Hong, Jeong Hee,Szymań,ski, Wojciech Cambridge University Press 2015 Proceedings. Section A, Mathematics Vol.145 No.2
<P>We investigate the structure of the outer automorphism group of the Cuntz algebra and the closely related problem of conjugacy of maximal abelian subalgebras in . In particular, we exhibit an uncountable family of maximal abelian subalgebras, conjugate to the standard maximal abelian subalgebra via Bogolubov automorphisms, that are not inner conjugate to .</P>
Network Experimentation for Cooperative Localization
Conti, A.,Guerra, M.,Dardari, D.,Decarli, N.,Win, M. Z. IEEE 2012 IEEE journal on selected areas in communications Vol.30 No.2
<P>This paper introduces the notion of network experimentation and proposes an experimentation methodology particularly suited for cooperative wireless networks. Based on this methodology we performed extensive measurement campaigns and compare various cooperative localization techniques under a common setting. Network experiments enable (i) the quantification of cooperation benefits, (ii) the development of techniques for harnessing environmental information, and (iii) the characterization of network localization algorithms. As a case study, we consider ultrawide bandwidth cooperative location-aware networks in cluttered indoor environments and evaluate their performance based on measurements collected from network experiments.</P>
The Weyl group of the Cuntz algebra
Conti, R.,Hong, J.H.,Szymanski, W. Academic Press ; Elsevier Science B.V. Amsterdam 2012 Advances in mathematics Vol.231 No.6
The Weyl group of the Cuntz algebra O<SUB>n</SUB> is investigated. This is (isomorphic to) the group of polynomial automorphisms λ<SUB>u</SUB> of O<SUB>n</SUB>, namely those induced by unitaries u that can be written as finite sums of words in the canonical generating isometries S<SUB>i</SUB> and their adjoints. A necessary and sufficient algorithmic combinatorial condition is found for deciding when a polynomial endomorphism λ<SUB>u</SUB> restricts to an automorphism of the canonical diagonal MASA. Some steps towards a general criterion for invertibility of λ<SUB>u</SUB> on the whole of O<SUB>n</SUB> are also taken. A condition for verifying invertibility of a certain subclass of polynomial endomorphisms is given. First examples of polynomial automorphisms of O<SUB>n</SUB> not inner related to those induced by unitaries from the core UHF subalgebra are exhibited, for every n≥2. In particular, the image of the Weyl group in the outer automorphism group of O<SUB>n</SUB> is strictly larger than the image of the restricted Weyl group analyzed in previous papers. Results about the action of the Weyl group on the spectrum of the diagonal are also included.
Cristian Conti,Corrado Pedrazzani,Giulia Turri,Eduardo Fernandes,Enrico Lazzarini,Raffaele De Luca,Alessandro Valdegamberi,Andrea Ruzzenente,Alfredo Guglielmi 대한대장항문학회 2021 Annals of Coloproctolgy Vol.37 No.3
Purpose: Laparoscopic complete mesocolic excision (CME) right colectomy is a technically demanding procedure infre- quently employed in Western centers. This retrospective cohort study aims to analyze the safety of laparoscopic CME col- ectomy compared to standard colectomy for right-sided colon cancer in a Western series. Methods: Prospectively collected data from 60 patients who underwent laparoscopic CME right colectomy were com- pared to the ones of 55 patients who underwent laparoscopic standard right colectomy. Results: No differences in clinical characteristics were observed between the CME and standard right colectomy groups. No differences were demonstrated in terms of blood loss (P = 0.060), intraoperative complications (P = 1), conversion rate (P = 0.102), and operative time (P = 0.473). No deaths were observed in either group, while complication rate was 40.0% in the CME and 49.1% in the standard group (P = 0.353). Severe complications occurred in 10.0% vs. 9.1% (P = 0.842), redo surgery in 5.0% vs. 7.3% (P=0.708), and unplanned readmission in 5.0% vs. 5.5% (P=1) after CME and standard colec- tomy, respectively. A significant difference in favor of CME was observed in the total length of specimen (P < 0.001), prox- imal (P=0.018), and distal margins (P=0.037). The number of lymph nodes harvested was significantly higher in the CME group (27 vs. 22, P = 0.037). Conclusion: In Western series, where patients have less favorable clinical characteristics, laparoscopic CME allows to ob- tain better quality surgical specimens and comparable short-term outcomes compared to standard right colectomy.
Pseudo-Riemannian Sasaki solvmanifolds
Diego Conti,Federico A. Rossi,Romeo Segnan Dalmasso 대한수학회 2023 대한수학회지 Vol.60 No.1
We study a class of left-invariant pseudo-Riemannian Sasaki metrics on solvable Lie groups, which can be characterized by the property that the zero level set of the moment map relative to the action of some one-parameter subgroup $\{\exp tX\}$ is a normal nilpotent subgroup commuting with $\{\exp tX\}$, and $X$ is not lightlike. We characterize this geometry in terms of the Sasaki reduction and its pseudo-K\"ahler quotient under the action generated by the Reeb vector field. We classify pseudo-Riemannian Sasaki solvmanifolds of this type in dimension $5$ and those of dimension $7$ whose K\"ahler reduction in the above sense is abelian.
Extending Quality Concepts to Cope with The Needs of a Global World
( Tito Conti ) 한국품질경영학회 2003 The Asian Journal on Quality Vol.4 No.1
The concept of quality is revisited to evidence its applicability beyond the product and economic transaction level, to cover every kind of human and social relation. A very important extension indeed in this globalization era, where an increasingly interconnected world badly needs rules and means to improve quality, both at economic and political level. To that aim, some commonplaces about quality need to be exposed to criticism and the close connection between value and quality concepts must be highlighted. Generalization of the quality related concepts could appear to be just a theoretical issue were it not for the fact that it opens the door to the extension of quality management concepts to every kind of organization: from the company to the state to the planet. Managing for quality appears to be a fundamental issue for all human-made systems.
Tissue-Material Integration and Biostimulation Study of Collagen Acellular Matrices
Quintero Sierra Lindsey Alejandra,Busato Alice,Zingaretti Nicola,Conti Anita,Biswas Reetuparna,Governa Maurizio,Vigato Enrico,Parodi Pier Camillo,Bernardi Paolo,Sbarbati Andrea,Conti Giamaica 한국조직공학과 재생의학회 2022 조직공학과 재생의학 Vol.19 No.3
BACKGROUND: Breast reconstruction after mastectomy using silicone implants is a surgical procedure that occasionally leads to capsular contracture formation. This phenomenon constitutes an important and persistent cause of morbidity, and no successful therapies are available to date. Recently, the use of acellular membranes as a protective material for silicone prostheses has been gaining attention due to their ability to prevent this adverse outcome. For this reason, the evaluation of the tissue-material integration and the induced biostimulation by acellular membranes results crucial. Evaluation of in vivo tissue integration and biostimulation induced by three different natural acellular collagen membranes. METHODS: Scanning electron microscopy was performed to analyse the membrane porosity and cells-biomaterial interaction in vitro, both in dry and wet conditions. Adipose-derived stem cells were cultured in the presence of membranes, and the colonisation capacity and differentiation potential of cells were assessed. In vivo tests and ex vivo analyses have been performed to evaluate dermal integration, absorption degree and biostimulation induced by the evaluated membrane. RESULTS: Analysis performed in vitro on the three different acellular dermal matrices evidenced that porosity and the morphological structure of membranes influence the liquid swelling ratio, affecting the cell mobility and the colonisation capacity. Moreover, the evaluated membranes influenced in different manner the adipose derived stem cells differentiation and their survival. In vivo investigation indicated that the absorption degree and the fluid accumulation surrounding the implant were membrane-dependent. Finally, ex vivo analysis confirmed the membrane-dependent behavior revealing different degree of tissue integration and biostimulation, such as adipogenic stimulation. CONCLUSION: The physico-chemical characteristics of the membranes play a key role in the biostimulation of the cellular environment inducing the development of well-organized adipose tissue.
A REMARK ON GEL'FAND DUALITY FOR SPECTRAL TRIPLES
Bertozzini, Paolo,Conti, Roberto,Lewkeeratiyutkul, Wicharn Korean Mathematical Society 2011 대한수학회보 Vol.48 No.3
We present a duality between the category of compact Riemannian spin manifolds (equipped with a given spin bundle and charge conjugation) with isometries as morphisms and a suitable "metric" category of spectral triples over commutative pre-$C^*$-algebras. We also construct an embedding of a "quotient" of the category of spectral triples introduced in [5] into the latter metric category. Finally we discuss a further related duality in the case of orientation and spin-preserving maps between manifolds of fixed dimension.