Morphotypes of Cytheridella ilosvayi (Ostracoda) detected by soft and hard part analyses

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1998 ◽  
Vol 43 ◽  
pp. 1-20 ◽  
Author(s):  
M. F. Burnyeat

Mr Vice-Chancellor,May I thank you for coming to preside at this occasion, and thank everyone else for coming to be presided over – most especially my colleagues in the Faculty of Classics. You were not all here when I joined the Faculty eighteen years ago, but you have all helped to sustain the atmosphere of cooperation, good will, and intellectual adventure, which has made this Faculty such a wonderful place to work and teach in. There is much that I shall miss when I go. But that is not what I want to talk about now. To borrow the words of our Chairman, Ian DuQuesnay, I should like this occasion to be a party rather than a wake.What I want to say is this. It is too late now – twelve years too late – to apologize for not having given an Inaugural Lecture. There was no particular moment when I decided not to, just many many moments when other work seemed both more urgent and, to be honest, more interesting. The trouble with Inaugural Lectures is that you are expected to define your subject and say how it ought to be done. You begin by paying respectful tribute to your predecessor – in my case G. E. L. Owen, so the tribute would have been sincere and a pleasure to compose. But then comes the hard part, in which you set out ‘the aims and objectives’ (as the managerial language of our present rulers would have us call them) of your discipline. In other words, I would have had to tell myself and my colleagues where ancient philosophy in Cambridge ought to go and how it ought to get there.


2013 ◽  
Vol 50 (4) ◽  
pp. 1025-1043 ◽  
Author(s):  
Nicole Bäuerle ◽  
Zejing Li

We consider a multi asset financial market with stochastic volatility modeled by a Wishart process. This is an extension of the one-dimensional Heston model. Within this framework we study the problem of maximizing the expected utility of terminal wealth for power and logarithmic utility. We apply the usual stochastic control approach and obtain, explicitly, the optimal portfolio strategy and the value function in some parameter settings. In particular, we do this when the drift of the assets is a linear function of the volatility matrix. In this case the affine structure of the model can be exploited. In some cases we obtain a Feynman-Kac representation of the candidate value function. Though the approach we use is quite standard, the hard part is to identify when the solution of the Hamilton-Jacobi-Bellman equation is finite. This involves a couple of matrix analytic arguments. In a numerical study we discuss the influence of the investors' risk aversion on the hedging demand.


2020 ◽  
Author(s):  
Nandkumar Niture

The AI, deep learning and machine learning algorithms are gaining the ground in every application domain of information technology including information security. In formation security domain knows for traditional password management systems, auto-provisioning systems and user information management systems. There is another raising concern on the application and system level security with ransomware. On the existing systems cyber-attacks of Ransomware asking for ransom increasing every day. Ransomware is the class of malware where the goal is to gain the data through encryption mechanism and render back with the ransom. The ransomware attacks are mainly on the vulnerable systems which are exposed to the network with weak security measures. With the help of machine learning algorithms, the pattern of the attacks can be analyzed. Create or discuss a workaround solution of a machine learning model with combination of cryptographic algorithm which will enhance the effectiveness of the system response to the possible attacks. The other part of the problem, which is hard part to create an intelligence for the organizations for preventing the ransomware attacks with the help of intelligent system password management and intelligent account provisioning. In this paper I elaborate on the machine learning algorithms analysis for the intelligent ransomware detection problem, later part of this paper would be design of the algorithm.


2020 ◽  
Vol 55 ◽  
pp. 136-150
Author(s):  
Yu.M. Shirshov ◽  

Despite the great practical importance, the control of blood by optical methods is enormously complicated by the strong scattering of light. This is especially true for formed blood elements (FBEs), which are a compact suspension that remains after plasma removal from blood by centrifugation. The study of the surface plasmon resonance (SPR) in Kretchman’s geometry together with measurement of the angular dependence of the light internal reflection R( φ ) at the glass/ FBEs boundary is one of the few possibilities to obtain additional information about the structure and molecular composition of this complex inhomogeneous object. Measurement of R( φ ) for contact FBEs with the glass surface allows to determine the total internal reflection (TIR) angle and the effective refractive index N of the binary of erythrocytes-blood plasma mixture. At the same time, the comparison of the angles of TIR and SPR makes it possible to establish the presence of a transition layer between gold surface and the volume of FBEs. In addition, a detailed matching of the experimental dependence R( φ ) with one of calculated curve by regression method allows minimize the objective function and allows to establish a detailed model of the transition layer. The paper shows that the value of N is 1.4003...1.4008. According to the formula of the effective Bruggeman's medium, the packing density of erythrocytes in the volume of FBEs is about 85%, which is well matched with the data known from the literature. At the same time, at least two intermediate layers were detected at the gold /FBEs interface. (1) A layer 33–38 nm thick adjacent to the hydrophobic surface of the gold film and with a refractive index of N p = 1.356–1.357. Presumably, it is a binary phase with a liquid part in the form of water, a buffer solution or blood plasma and a hard part in the form of proteins non-specifically related to gold, most likely molecules of albumin and fibrinogen. (2) A thicker, transition-to- volume FBEs layer is most likely related to the edges curvature and marginal packing of erythrocytes; the effective thickness of this layer is d m = 130-200 nm, and the effective refractive index N m = 1.356... 1.369. The details of this transition layer are currently of considerable practical interest because they can reflect the physiological state of blood cells and whole body, and the parameters d m and N m can be useful from a biological or medical point of view.


2014 ◽  
pp. 321-358
Author(s):  
Gustavo Crespi ◽  
Eduardo Fernández-Arias ◽  
Ernesto Stein
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Author(s):  
Stephen Yablo

Essentialists maintain that an object’s properties are not all on an equal footing: some are ‘essential’ to it and the rest only ‘accidental’. The hard part is to explain what ‘essential’ means. The essential properties of a thing are the ones it needs to possess to be the thing it is. But this can be taken in several ways. Traditionally it was held that F is essential to x if and only if to be F is part of ‘what x is’, as elucidated in the definition of x. Since the 1950s, however, this definitional conception of essence has been losing ground to the modal conception: x is essentially F if and only if necessarily whatever is x has the property F; equivalently, x must be F to exist at all. A further approach conceives the essential properties of x as those which underlie and account for the bulk of its other properties. This entry emphasizes the modal conception of essentiality. Acceptance of some form of the essential/accidental distinction appears to be implicit in the very practice of metaphysics. For what interests the metaphysician is not just any old feature of a thing, but the properties that make it the thing it is. The essential/accidental distinction helps in other words to demarcate the subject matter of metaphysics. But it also constitutes a part of that subject matter. If objects have certain of their properties in a specially fundamental way, then this is a phenomenon of great metaphysical significance.


2020 ◽  
Vol 185 (Supplement_3) ◽  
pp. 58-62
Author(s):  
Teresa Roberts

Abstract The transformation of the Military Health System to the Defense Health Agency under the National Defense Authorization Act of 2017 is a change of historical proportion. Change can be seen as hard, yet change is always happening. What is actually hard is providing leadership to accomplish the mission and goals for ourselves and our organizations within constant change. Those of us selected for leadership positions often receive standardized preparation and experiences to help us with this challenge. The hard part, though, is not what we often think it is. Leadership is not hard because of the amount of change or the people we are leading. Leadership is hard because, as we increase our rank and responsibilities, there are more people we need to see as people, having an outward mindset toward them, to have a positive influence and impact. In this article, I share the challenge I experienced with an outward mindset in leading the transition of our military treatment facility under the transformation to Defense Health Agency.


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