Using Column Generation to Solve Extensions to the Markowitz Model

We introduce a solution scheme for portfolio optimization problems with cardinality constraints. Typical portfolio optimization problems are extensions of the classical Markowitz mean-variance portfolio optimization model. We solve such type of problems using a method similar to column generation. In this scheme, the original problem is restricted to a subset of the assets resulting in a master convex quadratic problem. Then the dual information of the master problem is used in a sub-problem to propose more assets to consider. We also consider other extensions to the Markowitz model to diversify the portfolio selection within the given intervals for active weights.Comment: 16 pages, 3 figures, 2 tables, 1 pseudocod

The problems of Women's lives revealed in a collection of short stories titled Poems that Kanalil Pootha Kavithaigal

Through his work, the Creator conveys the messages and ideas he has felt or intended to go to society. It is the characters who help the readers to convey their point of view to the readers. Thoughts are the main factor that determines life If the thought is strong, we have to live the life of action in its course and fear it. The purpose of this article is to explore how the female story characters that may feature in the collection of short stories, Poems That Kanalil Pootha Kavithaigal, are arranged

Analysis of Link Availability in FSO-OFDM System under Various Climatic Conditions

Free Space Optics (FSO) is an emerging solution for the last mile broad band connectivity where deployment of fiber is expensive. This wireless technology has attracted the researchers due to the ease of erecting along the windows and terrace and the abundant bandwidth available in the unlicensed band. Combining OFDM with FSO gives a hybrid technique - OFDM based FSO or FSO-OFDM in which OFDM symbol modulates the light that passes through free space. Various predictable and unpredictable phenomena cause variation in the light that causes the fading effect of the received signal. Besides the atmospheric effect, the signal power varies within the symbol. The link availability has been calculated by setting threshold power at the receiver. The simulation of the OFDM based FSO system under three climatic conditions namely summer, winter and rainy has been observed that shows the link availability is 99.3% for summer, 98.32% for winter and 98.99% for rainy condition. Under worst climatic condition link availability is 98.17%. Thus FSO- OFDM is able to provide better connectivity even under any atmospheric condition

Visible and infrared photocurrent enhancement in a graphene-silicon Schottky photodetector through surface-states and electric field engineering

The design of efficient graphene-silicon (GSi) Schottky junction photodetectors requires detailed understanding of the spatial origin of the photoresponse. Scanning-photocurrent-microscopy (SPM) studies have been carried out in the visible wavelengths regions only, in which the response due to silicon is dominant. Here we present comparative SPM studies in the visible ($\lambda$ = 633nm) and infrared ($\lambda$ = 1550nm) wavelength regions for a number of GSi Schottky junction photodetector architectures, revealing the photoresponse mechanisms for silicon and graphene dominated responses, respectively, and demonstrating the influence of electrostatics on the device performance. Local electric field enhancement at the graphene edges leads to a more than ten-fold increased photoresponse compared to the bulk of the graphene-silicon junction. Intentional design and patterning of such graphene edges is demonstrated as an efficient strategy to increase the overall photoresponse of the devices. Complementary simulations and modeling illuminate observed effects and highlight the importance of considering graphene's shape and pattern and device geometry in the device design

Analisis Pengaruh Customer Relationship Management, Persepsi Harga, dan Kualitas Pelayanan terhadap Loyalitas Pelanggan Kendaraan Niaga Merek Hino

This research aims to examine and Analysis the Effect of Customer Relationship Management, Price Perception, and Quality of Service to Customer Loyalty Vehicle Logistic Brand Hino that became the object of research. The reaserch design used is quantitative and explanatory research type of survey methods. Data was collected using questionnaires to 105 respondents, the sampling technique used is online survey via customer emails as. The method of analysis is SPSS. The result of the research showed that customer relationship management has a positively and significant customer loyalty vehicle logistic, price perception have positiv and effect significant customer loyalty vehicle logistic, and quality of service positive and significant influence to customer loyalty vehicle logisti

A Power Quality Improvement for Microgrid Inverter Operated in Grid Connected and Grid Disconnected Modes

The renewable energy based distributed generators (DGs) will plays a dominant role in electricity production. A micro grid consists of clusters of load and distributed generators that operate as a single controllable system. The interconnection of the DG to the utility/grid through power electronic converters has raised concern about safe operation and protection of the equipments. The main objective of this paper is too focused on the power quality improvement in micro grid. In the distributed power system, the increased infiltration of nonlinear loads and power electronic interfaced distribution generation systems creates power quality issues such as voltage unbalance, frequency regulation and harmonic elimination

By using Internet of Things Analysis of Waste Monitoring System

Metropolitan territories in urban areas are confronting poor strategy for waste administration. Since there is quick increment of urban populace unhygienic conditions are winning. To maintain a strategic distance from this condition and to enhance the personal satisfaction powerful waste administration is utilized. In proposed framework, squander container is checked with the sensors and GSM framework. An android application is utilized to screen data with respect to squander independent of area. By this squanders are expelled effectively

Development of technology for modified starch incorporated grains and pulse blended bakery and pasta products

The study aimed to investigate the appropriate technology for the development of modified starch and standardize the millet-based bakery and pasta products incorporated with modified starch and measure the glycemic index of the standardized therapeutic baked and pasta products. The physical modification and chemical modification techniques were performed to optimize the technology for modified starch. Refined wheat flour was substituted with millet flour, modified starch and pulse flour at various percentages to optimize the flour blend for pasta and bakery products. The products were subjected to in vitro study to measure the glycemic index. Physical modification technique, i.e. autoclave-cooling, was found to be optimum for the development of modified starch. The optimum flour blend for pasta products was whole wheat flour(50%), millet flour (25 and 50%), cassava modified starch (15 and 25%) and green ram flour (10%) and it was found to be acceptable without affecting its sensory attributes. The optimum blend for bread was whole wheat flour (50%), kodo / barnyard millet flour (50%) with cassava modified starch (10%) and for low-fat cookies, it was millet flour (20%) and modified starch (15 %). Among the three pasta products, noodles and macaroni were found to be highly acceptable with minimum cooking loss. The in vitro study showed that the pasta products have a hypoglycemic effect suitable for lifestyle disorder patients and do not involve high production costs and earn good returns to the entrepreneurs