The paper proposes a scheme, referred to as proactive server roaming, to mitigate the effects of denial of service (DoS) attacks. The scheme is based on the concept of ‘‘replicated elusive service’’, which through server roaming, causes the service to physically migrate from one physical location to another. Furthermore, the proactiveness of the scheme makes it difficult for attackers to guess ...

The objective of this article is to discuss effective communication strategies between elderly patients and their physicians from the perspective of osteopathic heritage. The patient-physician communication styles of Andrew Taylor Still, MD, DO, and early osteopathic physicians (ie, DOs) may have influenced how DOs today communicate with their patients. Historical literature describes how Still...

We report valence and conduction band densities of states measured via ultraviolet and inverse photoemission spectroscopies on three metal halide perovskites, specifically methylammonium lead iodide and bromide and cesium lead bromide (MAPbI3, MAPbBr3, CsPbBr3), grown at two different institutions on different substrates. These are compared with theoretical densities of states (DOS) calculated ...

Denial of Service (DoS) attacks constitute a major security threat to today’s Internet. This challenge is especially pertinent to the Internet of Things (IoT) as devices have less computing power, memory and security mechanisms to mitigate DoS attacks. This paper presents a model that mimics the unique characteristics of a network of IoT devices, including components of the system implementing ...

A denial-of-service attack (DoS attack) is an attempt to make a system resource unavailable to its intended users. Several types of DoS attacks are known. A SYN flood attack is a typical DoS attack, exploiting the vulnerability of TCP’s three-way handshake with respect to imbalances between the computational costs of clients and server. In addition to cost imbalance, the amount of cost over a g...

Client puzzles are meant to act as a defense against denial of service (DoS) attacks by requiring a client to solve some moderately hard problem before being granted access to a resource. However, recent client puzzle difficulty definitions (Stebila and Ustaoglu, 2009; Chen et al., 2009) do not ensure that solving n puzzles is n times harder than solving one puzzle. Motivated by examples of puz...

Resumo. Neste artigo é analisada a influência dos parâmetros de aprendizagem de algoritmos baseados em enxames e propostas estratégias para a atualização de políticas em ambientes dinâmicos. Nós verificamos que os parâmetros de aprendizagem quando ajustados inadequadamente podem ocasionar atrasos no processo de aprendizagem ou convergir para uma política não-satisfatória. Além disso, esse probl...

A assistência da deslocalização de elétrons sigma ou assistência anquimérica dos elétrons sigma explica grandes diferenças de velocidade na solvólise de 2-exoe 2-endo-norbornilp-bromobenzenosulfonatos. Este estudo foi anteriormente analisado pela teoria dos orbitais moleculares em fase gás. Ao revisitar este antigo problema a partir da teoria quântica de átomos em moléculas (QTAIM), novas infor...

Introdução e objetivo: A Doença Inl amatória Intestinal (DII) em 25-30% dos casos manifesta-se em idade pediátrica, reconhecendose um aumento da incidência nos últimos anos, particularmente de Doença de Cronh (DC). Pretendeu-se caracterizar o peri l clínico dos casos de DII em seguimento numa Unidade de Gastrenterologia Pediátrica, num período de 11 anos. Material e métodos: Estudo retrospectiv...

Serial blood draws for the assessment of trauma patients' hemoglobin (sHgb) and hematocrit (sHct) is standard practice. A device that would allow for continuous real-time, non-invasive monitoring of hemoglobin and tissue perfusion would potentially improve recognition, monitoring and resuscitation of blood loss. We developed a device utilizing diffuse optical spectroscopy (DOS) technology that ...