- Research Article
- 10.29013/ejems-21-2-76-81
MEAN VARIANCE PORTFOLIO OPTIMIZATION
- Jan 01, 2021
- European Journal of Economics and Management Sciences
- Jonathan Xu
Publications from 2021 to 2026
Showing 10 of 15 papers
MEAN VARIANCE PORTFOLIO OPTIMIZATION
VISUAL WORLD AND VISUAL FIELD DETECTION, THREE-DIMENSIONAL AREA AND PAINTING AREA
inde yaadmz ve anlamlandrdmz grsel dnyamz deiik faktrler ile srekli deiim halindedir. Bu deiimler iki farkl alglama biimi ile aklanabilir. Grsel dnya ve grsel alann alglanmas: Grsel alan ve grsel dnya arasnda izleyicinin bilgi birikimine, fiziksel pozisyonuna bal olduu
Read moreUK Localism: Unprecedented Opportunity for Local Migrant Integration Policies or ‘White Elephant’?
Since 2010 successive legislation aimed at decentralising power to the local level has led to the assertion that UK integration policies have undergone a ‘localist turn’ (Ali and Gidley 2014). When taken on face value, it is easy how this would appear to be the case. The 2012 Creating the Conditions for Integration policy clearly designates integration as a local issue and in 2016, the government introduced an Act which they claimed was “the biggest transfer of power from central to local government in recent history” (Osbourne, cited in Watt, 2015) Theoretically, local authorities in the UK have been given an unprecedented opportunity to inovate and facilitate migrant integration in their localities.
Read moreRowan Williams, <i>Being Disciples: Essentials of the Christian Life</i>
Metrological attributes of current transformers in electrical energy meters
Instrument current and voltage transformers remain the basic apparatus used in measurements of energy in electrical grid. Increasing importance of distributed energy sources necessitates more precise measurements of consumed as well as generated electrical energy. Both types occur in low voltage network where the main focus is on current transformers for electronic-type electrical energy meters. These current transformers should fulfil many requirements for precise electrical energy measurements. This paper presents a modern system for measurement of various metrological features of current transformers.
Read moreAbstract 4432: Discovery of novel Pin1 inhibitors by structure-guided fragment evolution that downregulate cyclin D1 expression in PC-3 prostate cancer cells
Abstract Pin1 is a peptidyl-prolyl isomerase (PPIase) that is specialized for catalysing isomerization around pSer/Thr-Pro bonds. As isomerisation around such bonds can promote major conformational changes within proteins, Pin1 is able to influence signaling dynamics and outcomes within pathways regulated by proline-directed kinases such as: MAP kinases, cyclin-dependent kinases and GSK-3β. Pin1 overexpression is only weakly oncogenic in itself, but enhances transformation by ErbB2 or activated Ras alleles. Remarkably however, cells from Pin1 deficient mice are resistant to transformation by Ras and ErbB2. As Pin1-deficient mice have a mild phenotype, there are considerable grounds for hope that Pin1 inhibitors will have value for the therapy of cancer and also inflammatory disorders. Here we report the discovery of our second series of cell active Pin1 inhibitors. Screening of a 700 member fragment library at high concentrations in a PPIase assay revealed 37 potential novel hits. Only two of these hits could be verified to bind Pin1 by 2D NMR, and we were able to obtain a crystal structure of just one of the novel hits bound to Pin1, a pyridyl pyrazole acid. After examining a number of 6-5 unfused ring system acids, we selected a phenyl-imidazole acid as a start point. A program of structure-guided medicinal chemistry led to the discovery of a series of ligands that occupied a novel combination of surfaces within the Pin1 active site, distinct from that occupied by our previously published amino acid-derived inhibitors. This effort culminated in VER-158197, a sub-micromolar (∼750 nM) inhibitor of Pin1 that exhibits high permeability in a CaCo-2 permeability assays and inhibits the growth of Pin1-dependent PC-3 prostate cancer cells (GI50 ∼ 13 uM). Mode of action studies indicated that VER-158197 downregulated cyclin D1 expression and prevented the phosphorylation of p70 S6 Kinase on Thr389 that is normally observed in repsonse to insulin stimulation. Note: This abstract was not presented at the AACR 101st Annual Meeting 2010 because the presenter was unable to attend. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 101st Annual Meeting of the American Association for Cancer Research; 2010 Apr 17-21; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2010;70(8 Suppl):Abstract nr 4432.
Read moreTooling Influence on Stencil Print Coating Uniformity for 150μM Thick 200Mm Wafers
ABSTRACT Applications for wafer print coating include protective coating and die attach adhesive applied on the backside and non-capillary active component protection on the front side. The preceding study examined the coating thickness distributions achieved comparing metal stencil print and mesh screen print processes using standard thickness 200mm diameter wafers. Despite mesh screen printing typically exhibiting better coating thickness uniformity results, the stencil print process is more commonly implemented. The process advantages provided by stencil printing include compatibility across a wider range of material rheology, smoother coating surface finish results, and complementing modern industry practice in using standard metal stencils. To that end, additional experiments have utilized the metal stencil printing process exclusively with 200mm wafers thinned to 150um, imitating more challenging process conditions that customers are now encountering. The primary objective of this study is to identify correlation between coating thickness control and wafer support tooling surface metrology. The data indicates coating thickness capability ratio (C p ) improvement exceeds 4x between best and worst performing wafer chucks, confirming our prediction that stricter chuck design tolerances are required for stencil print coating thinner wafers. This updated study improves our competency to satisfy demand for processing thinned wafers successfully.
Read moreA rose by any other name
I first met one of my oldest friends when we'd both reached that waddling stage of pregnancy. It was 1990. I had recently qualified as a GP and she was a partner in a local practice. Our first kids were born 6 days' apart. As our families expanded, between us, we used just about every job scheme going: locum, locum with a view, partner at all sorts of % shares, salaried GP, retainer, and academic GP with an honorary clinical contract. For years we spent Wednesday afternoons whinging happily about our various practices while the kids leapt across the furniture and scribbled on newly painted walls. We moaned about being on call on Mondays or not being on call on Mondays (depending on how the practice organised the Bank Holiday rota); partners who made a habit of putting chronic …
Read moreThe Use of Laser Acupuncture for the Treatment of Neurogenic Pruritus in a Child – a Case History
This report describes the successful treatment using laser acupuncture of a six year old girl with neurogenic pruritus of the abdomen. It is the first case report of neurogenic pruritus treated by laser acupuncture. The main advantage of using low energy laser, as opposed to acupuncture needles, to stimulate points, is that low energy laser causes little or no sensation, which is particularly useful when treating children.
Read moreDevelopment of 3D-Redistribution and Balling Technologies for Fabrication of Vertical Power Devices
ABSTRACT Based on the electroless wafer-level redistribution technology, the development of a rerouting technology for vertical power transistor devices, which includes the wiring through a via in the silicon wafer from the back to the front side, was realized. The basic technology approaches, as well as the stencil printing of preformed solder balls, will be presented and discussed.
Read more