247 research outputs found
On the KNS Conjecture in type
For the exceptional types , , and , we prove that the
specializations at roots of unity of the quantum dimensions of the
Kirillov-Reshetikhin modules give real solutions of -restricted
-systems, as conjectured by Kuniba, Nakanishi, and Suzuki. We also show that
these solutions are positive in type . In type and , we only
prove positivity for a subset of the nodes of the Dynkin diagram.Comment: 28 pages, 1 figur
Quantum affine algebras at roots of unity and generalised cluster algebras
Let be the restricted
integral form of the quantum loop algebra specialised
at a root of unity . We prove that the Grothendieck ring of a
tensor subcategory of representations of
is a generalised cluster
algebra of type , where is the order of . Moreover,
we show that the classes of simple objects in the Grothendieck ring essentially
coincide with the cluster monomials. We also state a conjecture for
, and we prove it for .Comment: 26 pages, 9 figure
Generalised cluster algebras and -characters at roots of unity
International audienceShapiro and Chekhov (2011) have introduced the notion of generalised cluster algebra; we focus on an example in type . On the other hand, Chari and Pressley (1997), as well as Frenkel and Mukhin (2002), have studied the restricted integral form of a quantum affine algebra where is a root of unity. Our main result states that the Grothendieck ring of a tensor subcategory of representations of is a generalised cluster algebra of type , where is the order of . We also state a conjecture for , and sketch a proof for .Shapiro et Chekhov (2011) ont introduit la notion d'algĂšbre amassĂ©e gĂ©nĂ©ralisĂ©e; nous Ă©tudions un exemple en type . Par ailleurs, Chari et Pressley (1997), ainsi que Frenkel et Mukhin (2002), ont Ă©tudiĂ© la forme entiĂšre restreinte d'une algĂšbre affine quantique oĂč est une racine de l'unitĂ©. Notre rĂ©sultat principal affirme que l'anneau de Grothendieck d'une sous-catĂ©gorie tensorielle de reprĂ©sentations de est une algĂšbre amassĂ©e gĂ©nĂ©ralisĂ©e de type , oĂč est l'ordre de . Nous conjecturons une propriĂ©tĂ© similaire pour et donnons un aperçu de la preuve pour
Transient Addressing for Related Processes: Improved Firewalling by Using IPV6 and Multiple Addresses per Host
Traditionally, hosts have tended to assign relatively few network addresses to an interface for extended periods. Encouraged by the new abundance of addressing possibilities provided by IPv6, we propose a new method, called Transient Addressing for Related Processes (TARP), whereby hosts temporarily employ and subsequently discard IPv6 addresses in servicing a client host's network requests. The method provides certain security advantages and neatly finesses some well-known firewall problems caused by dynamic port negotiation used in a variety of application protocols. A prototype implementation exists as a small set of kame/BSD kernel enhancements and allows socket programmers and applications nearly transparent access to TARP addressing's advantages
Generalised cluster algebras and -characters at roots of unity
Shapiro and Chekhov (2011) have introduced the notion of generalised cluster algebra; we focus on an example in type . On the other hand, Chari and Pressley (1997), as well as Frenkel and Mukhin (2002), have studied the restricted integral form of a quantum affine algebra where is a root of unity. Our main result states that the Grothendieck ring of a tensor subcategory of representations of is a generalised cluster algebra of type , where is the order of . We also state a conjecture for , and sketch a proof for
Disease burden and direct medical costs of incident adult ADHD:A retrospective longitudinal analysis based on German statutory health insurance claims data
Background. Adult attention-deficit/hyperactivity disorder (aADHD) is still a largely unrecognized psychiatric condition despite its strong impact on individuals' well-being. Here, we describe the healthcare situation of individuals with incident aADHD over 4 years before and 4 years after initial administrative diagnosis. Methods. A retrospective, longitudinal cohort analysis was conducted using German claims data. The InGef database contained approximately 5 million member-records from over 60 nationwide statutory health insurances (SHI). Individuals were indexed upon initial diagnosis of aADHD. Results. Average age at diagnosis of aADHD was 35 years, and 60% of individuals were male. Comorbidities, resource use, and healthcare costs were substantial before initial diagnosis and decreased within the 4 years thereafter. Only 32% of individuals received initial ADHD medication and adherence was low. The majority received psychotherapy. Individuals with initial ADHD medication showed the highest share in comorbidities, physician visits, medication use for comorbidities, psychotherapy, and costs. Overall, healthcare costs were at over euro4,000 per individual within the year of aADHD diagnosis. Conclusions. We conclude that earlier recognition of aADHD could prevent the development and aggravation of comorbid mental illnesses. At the same time, comorbid conditions may have masked ("over-shadowed") aADHD and delayed diagnosis. The burden of disease in aADHD is high, which was noticeable especially among individuals who received initial ADHD-medication, suggesting that psychopharmacological treatment was mainly considered for the most severely ill. We conclude that measures to facilitate access of aADHD patients to clinical experts are required to improve reality of care in the outpatient setting
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