The Determinants of Earning Differentials in Ankara and Istanbul

In this study, an attempt is made to compare and contrast the determinants of earnings differentials in Ankara and Istanbul. The determinants of earnings differentials are first examined with semi-logarithmic single equation models based on the basic human capital approach. Secondly, extended models are formed in which all the variables are expressed as dummy variables. In general, the average per hour earnings in Istanbul, is higher than in Ankara. It is found that age, gender, education and job status have significant effects on the explanatory power of the model, whereas occupation and marital status have only limited effect.Turkey, earning differentials

Time Use in Rural Areas: A Case Study in Turkey

This study aims to analyze rural household work and leisure time and how it is allocated among various activities and by socio-economic characteristics of individuals. The analysis is based on a survey carried out in two central Anatolian villages. Three time use questionnaires are administered between May-October 2003 during two different days of the week, an ordinary weekday and the day of the local bazaar. 138 household members from these two villages have participated in the survey. It is found that on the average, the villagers spend over half of their nonsleeping time on non-economic activities including personal development. The remaining time spent on agricultural and non-agricultural economic activities is about the same. Males on the average spend more time on all activities than females except for personal development. The results show that, time use patterns change during different days of the week and months of the year. It is also found that, there is a high correlation between time use patterns and socio-economic characteristics of the households. In general there are statistically significant differences in the average time devoted to activities by education and age groups. Finally, significant differences are observed in the time use patterns rather than magnitudes by gender. As expected, differentiation in men’s and women’s roles is observed in agricultural activities.Time Use surveys, rural households, agricultural activities

Fault Tolerant Super Twisting Sliding Mode Control of a Quadrotor UAV Using Control Allocation

In this study, a fault-tolerant super-twisting sliding mode controller with a control allocation system for a quadrotor aircraft is proposed. Super twisting sliding mode control is a robust control technique that handles a system with a relative degree equal to one. A super-twisting sliding mode controller is proposed because of its robustness to uncertainties and perturbations. It increases accuracy and reduces chattering. A control allocation algorithm is developed to cope with the actuator fault. Firstly, a nonlinear model of the quadrotor unmanned aerial vehicle (UAV) is presented. Then, the controller design and type of the actuator fault are explained. The control allocation algorithm is used to optimize the trajectory tracking performance of the quadrotor in the presence of an actuator fault. A control allocation algorithm is an effective approach to implementing fault-tolerant control. When actuator faults are identified, they can be modeled as changes in the B matrix of constraints. Various simulations have been made for situations with and without actuator failure. In normal conditions, the quadrotor can accurately track altitude, roll, pitch and yaw references. In faulty conditions, the quadrotor can follow the references with a small error. Simulations prove the effectiveness of the control allocation algorithm, which stabilizes the quadrotor in case of an actuator fault. Overall, this paper presents a novel fault-tolerant controller design for quadrotor aircraft that effectively addresses actuator faults using a super-twisting sliding mode controller and control allocation algorithm

Active Queue Management of TCP Flows with Self-scheduled Linear Parameter Varying Controllers

Control-theoretic approaches to Active Queue Management (AQM) are typically based on linearizations of fluid flow models around design conditions. These conditions depend on the Round Trip Time (RTT), and the AQM performance is known to degrade if RTT values during actual operation depart substantially from design values. To overcome this difficulty a self-scheduled LPV controller for AQM is considered in this paper, where the controller is modified in real-time based on RTT. Simulations show that the self-scheduled LPV controller has good performance for both constant and time-varying RTTs, and outperforms two other common control-theoretic approaches to AQM

Microstrip Patch Antenna Design at 10 GHz for X Band Applications

Microstrip patch antennas are used in satellite imaging systems, wireless communication equipment, military radios, GPS (Global Positioning System) and GSM (Global System for Mobile Communications) applications. Its advantages are its small size and light weight, thin structure, low power consumption, use in dual frequency applications, and patching in various geometric shapes. Developing technology has facilitated and accelerated the production of microstrip antennas. In this study, microstrip antenna design operating at 10 GHz frequency for X band applications has been made. X band is used for air traffic control, weather traffic control, vessel traffic control, defense tracking and vehicle speed detection, terrestrial communications and networking, space communications and amateur radio. HFSS program was used in antenna design. AWR program was used to find transmission line parameters. In addition, MATLAB program was used to calculate some parameters. First of all, information is given about the working principle of the antenna, the selected dielectric layer and the working frequency. Schematic drawings of the designed antenna were made from above and from the side. S11 reflection coefficient magnitude graphs are drawn below and above the operating frequency. The radiation pattern is drawn for the E-plane and H-plane at the operating frequency. 3-D (dimensional) plot of antenna gain at operating frequency is drawn. The simulations performed have shown that the designed antenna works successfully.&nbsp

Food security issues in Turkey

Food security in Turkey is assessed with respect to supply, demand and policy. In the section on supply, the country's resource endowments, technology and the resulting food production are discussed. The section on demand considers the income generated in the country and the purchasing power of the members as well as their consumption habits. The section on policy reviews the role of government and its policies at both the macro- and micro-levels in facilitating, directing and harmonizing supply and demand toward the achievement of food security. First, a conceptual approach related to food security, self-sufficiency and nutrition is introduced. Second, the food security performance of the Turkish economy in the three decades since the 1960s is considered using these concepts. The evidence presented in this chapter suggests that Turkey is potentially a food-secure country-both in the short run and in the near future. Turkey's food supply is more than sufficient to meet the nutritional demands of its population. The exportation of Turkey's surplus food supply also has potential

Non-linear programming models for sector and policy analysis

This paper examines the basic problems of the mathematical programming models used for agricultural sector and policy analysis. Experience with traditional programming models shows that a considerable improvement in performance is possible by adequately incorporating non-linear relationships. Particular emphasis will be given to the calibration and validation problems involved in this type of model. With the help of the Turkish agricultural sector model it will be demonstrated that an empirical specification of a non-linear programming model for the agricultural sector is possible even with poor statistical data and that an operational model version can be handled on a PC