This paper summarizes the current state of the art and recent trends in software engineering economics. It provides an overview of economic analysis techniques and their applicability to software engineering and management. It surveys the field of software cost estimation, including the major estimation techniques available, the state of the art in algorithmic cost models, and the outstanding research issues in software cost estimation.

Software engineering economics

Meetings of the Advisory Technical Committees of the International Electrotechnical Commission were held in Brussels March 27th to April 1st. The meetings were attended by delegates from eight national committees — Belgium, France, Great Britain, Holland, Italy, Spain, Switzerland, and the United States. There were about 40 delegates in all.

https://ieeexplore.ieee.org/iel5/5308791/5321388/05321395.pdf

The International Electrotechnical Commission

Demand side management (DSM) plays a critical role in dealing with power system reliability as one of the main challenges of generating energy in stand-alone residential buildings. This paper introduces a new effective approach of DSM based on predetermined hourly generation and time-varying tariffs to enhance the reliability and quality of a stand-alone energy system. This research focus on two main novelties: 1) analyzing data via clustering method to improve the efficiency and accuracy of DSM, and 2) a state-of-the-art modeling framework DSM for a stand-alone residential building. Looking at first novelty, the well-known linkage-ward clustering method is used for defining time-varying tariffs and in the second novelty the mixed integer linear programming (MILP) formulates the power system components, load management and objective function considering user's priority and convenience to improve the reliability of a stand-alone energy system. The proposed method outperforms DSM in hybrid power systems consisting of photovoltaic, wind turbines, and energy storage systems. To illustrate the efficiency of this strategy, the proposed DSM is applied to a stand-alone building located in Sistan and Baluchistan province of Iran as an experimental case. Considering four different case studies that include a battery energy storage system and electric vehicle, the results reveal that the power system reliability and energy supplying quality are significantly improved by utilizing the aforementioned DSM.

Data-Driven load management of stand-alone residential buildings including renewable resources, energy storage system, and electric vehicle

A hybrid of firefly and improved particle swarm optimization algorithms for load balancing in cloud environments: Performance evaluation

Toward smart schemes for modeling CO2 solubility in crude oil: Application to carbon dioxide enhanced oil recovery

In this chapter, the basic principles of optimization and the mathematical formulation of the optimization problem have been provided. Besides, the categorization of the optimization problems has been presented in terms of the number of constraints, the structure of the variables, and linearity of the formulation elements. Considering the most familiar type of optimization problem, linear optimization approach has been examined in details. Then, some remarkable optimization techniques under the classification of unconstrained and constrained techniques have been investigated. Moreover, as regarding the increasing trend in the utilization of intelligent constrained optimization methods for the implementation and operational problems of renewable energy technologies, the literature have been reviewed.

Introduction to Optimization

The potential of symbolic algebra for the design of control systems is illustrated through several examples. It has been shown in particular, that (a) the exact calculations provided by symbolic algebra can be used to utilize some of the direct (but numerically error prone) methods efficiently in control system design, and (b) symbolic manipulations by a computer can help control engineers at several stages of the design. The block diagram reduction, calculation of all stabilizing controllers, dominant pole assignment and robust pole assignment are taken as case studies.

Designing control systems using exact and symbolic manipulations of formulae

Modular Fault Diagnosis in Fixed-Block Railway Signaling Systems

Typically, software development processes are time consuming, expensive, and rigorous, particularly for safety-critical applications. Even if guidelines and recommendations are defined by sector-specific functional safety standards, development process may not be completed because of excessive costs or insufficient planning. The V-model is one of the most well-known software development lifecycle model. In this study, the V-model lifecycle is modified by adding an intermediate step. The proposed modification is realized by checking the fault diagnosability of each module. The proposed modification provides three advantages: (1) it checks whether the constructed model covers all software requirements related with faults; (2) it decreases costs by early detection of modeling deficiencies before the coding and testing phases; and (3) it enables code simplicity in decision of fault occurrence.

Enhanced V-Model

Fast and accurate electromagnetic torque calculation of unconventional Permanent Magnet Synchronous Machines (PMSMs) is very important in order to reduce design effort. Dual winding PMSMs (DWPMSMs) can be categorized as unconventional and commonly available fast design software that usually lacks predicting machine performance. In this study, an analytical modeling approach has been proposed to calculate electromagnetic torque of DWPMSMs, which has motor and generator windings in a single stator core. Conformal mapping is used for the calculation of flux levels at various locations in the machine. Radial and tangential components of flux densities due to magnet and winding are determined analytically. Instantaneous value of electromagnetic torque due to generator or motor windings is calculated by integrating the Maxwell stress tensor in the middle of the air gap. Accuracy of the proposed analytical solution is confirmed with finite element analysis results. For further validation, an experimental...

Ilker Ustoglu

Papers

Introduction to Optimization

Designing control systems using exact and symbolic manipulations of formulae

Modular Fault Diagnosis in Fixed-Block Railway Signaling Systems

Enhanced V-Model

Analytical Modeling of Dual Winding Surface-mounted Permanent Magnet Synchronous Machine for Hybrid Electric Vehicle Accessory Drive Systems