Optimal Combinatorial Mechanism Design

We consider an optimal mechanism design problem with several heterogeneous objects and interdependent values. We characterize ex post incentives using an appropriate monotonicity condition and reformulate the problem in such a way that the choice of an allocation rule can be separated from the choice of the payment rule. Central to our analysis is the formulation of a regularity condition, which gives a recipe for the optimal mechanism. If the problem is regular, then an optimal mechanism can be obtained by solving a combinatorial allocation problem in which objects are allocated in a way to maximize the sum of "virtual" valuations. We identify conditions that imply regularity for two nonnested environments using the techniques of supermodular optimization.

A Survey on Deep Learning-based Architectures for Semantic Segmentation on 2D images

Semantic segmentation is the pixel-wise labelling of an image. Since the problem is defined at the pixel level, determining image class labels only is not acceptable, but localising them at the original image pixel resolution is necessary. Boosted by the extraordinary ability of convolutional neural networks (CNN) in creating semantic, high level and hierarchical image features; excessive numbers of deep learning-based 2D semantic segmentation approaches have been proposed within the last decade. In this survey, we mainly focus on the recent scientific developments in semantic segmentation, specifically on deep learning-based methods using 2D images. We started with an analysis of the public image sets and leaderboards for 2D semantic segmantation, with an overview of the techniques employed in performance evaluation. In examining the evolution of the field, we chronologically categorised the approaches into three main periods, namely pre-and early deep learning era, the fully convolutional era, and the post-FCN era. We technically analysed the solutions put forward in terms of solving the fundamental problems of the field, such as fine-grained localisation and scale invariance. Before drawing our conclusions, we present a table of methods from all mentioned eras, with a brief summary of each approach that explains their contribution to the field. We conclude the survey by discussing the current challenges of the field and to what extent they have been solved.Comment: Updated with new studie

Determinants of Integration and Its Impact on the Economic Success of Immigrants: A Case Study of the Turkish Community in Berlin

Using a new data on 590 Turkish households in Berlin, we investigate the determinants and impact of integration on economic performance. We find that usual suspects such as time spent in Germany and education have positive impact, while networks have no impact on integration. There is strong evidence that political integration and the degree of full integration promote income. Using endogenous switching regression models, we show that local familial networks increase the income of unintegrated migrant groups only, while transnational networks decrease it. We also find that education is more welfare improving for integrated than non-integrated immigrants.integration, economic success, ethnic networks, Turkish migrants

The Role of Decoration Magazines in the Art Education

AbstractThis notification aims to find out what kind of effects furniture and decoration magazines have on the art education. It is possible to mention about two different points of view regarding this subject. The first one argues that products, which take place in these magazines, are results of a design process; they aim to develop creativity of readers besides providing their artistic and aesthetical developments; and thus, they can be useful in the art education. The second one emphasizes that these magazines are products of the popular culture; they serve to the expansion of the popular culture; and thus, they cannot contribute to the art education. Visual arts education aims to enable persons to express their emotions, opinions and observations; and to increase their skills and creativities to an aesthetical level. It is an education activity which teaches persons how to canalize their excitements. The art education is not just/only limited to the visual arts given at schools, and it is required to last for the whole life

Anger Management of Students for a Peaceful School Environment: The Group Studies

AbstractThe aim of this study is to provide guidance to students in gaining skills to control their aggressive behaviours through an anger management group study. In this study, a pretest- posttest control group design has been used. Data gathered from 288 students have been analysed through SPSS-20 statistical program. The Empathic Tendency scale, Aggressiveness scale, and Anger Rating scale with three subscales as overt-anger, covert-anger, and anger control have been applied to both control and experimental group members as pretests and posttests. The experimental group members have learned to control their anger feelings/behaviours at the end of the group activities. When students learn to display their anger feelings appropriately probably school settings will be more peaceful places than that present

Integrating Curriculum: Developing Student Autonomy In Learning In Higher Education

The need to combine social constructivist activities with cognitive constructivist ones has emerged which incorporates personalized learning approaches. Characteristics of education and educational institutions of the third millennium indicate that flexibility, inclusiveness, collaboration, authenticity, relevance and extended institutional boundaries are the leading features of superior education. While educational goals have changed and expanded to incorporate lifelong learning, global interaction, the attainment of meta-cognitive knowledge and abilities, so did the role of both students and teachers (Felix, 2005). This study is about various techniques used in curriculum development, teaching and assessment, one of which is the negotiated curricula. How to integrate this phenomenon of the learning and teaching literature into curriculum and its influence on students’ active learning is presented

Curricular Elements of Problem-Based Learning That Cause Developments of Self-Directed Learning Behaviors Among Students and Its Implications on Elementary Education

Rapid technological and social changes and developments in the world put high demands on individuals. The high demanding world increases the pressure on educational systems to be more effective. “Therefore, educators have looked at constructivist pedagogical designs that are based of cognitive and social interactions in problem-centered environments” (Greeno, Collins, & Resnick, 1996; Savery & Duffy, 1994). It is claimed that the active learning emphasized in PBL promotes self-directed learning strategies needed for lifelong learning. Self-directed learning is related with cognitive ability, selfconcept, and achievement. Therefore, it is important to determine curricular elements of problem-based learning that cause self-directed behaviors among its students. Problem-based curriculum is student centered, students attempt to identify and solve a problem with their existing knowledge, they identify knowledge deficits and generate appropriate learning issues, they independently search the learning issues, critiquing the resources used for research, and apply the new knowledge to the problem, and students in the small group collaborative reflection on self-directed behavior improve students’ self-directed behaviors. It is believed that discussions in the tutorial group, content to be tested, lectures, tutor, and reference literature also impact on students’ self-directed behaviors. Most of the studies about problem-based learning and self-directed behaviors have been carried out among college students more particularly among medical students. On the other hand elementary students have different characteristics than do medical students. The basic elements of problem-based curriculum, which affect students’ self-directed learning behaviors, require some changes and modifications so that they can be effectively applied to elementary-aged students

PASSIVE AND ACTIVE CONTROL OF ACOUSTIC RESONANCE IN CAVITY FLOWS USING FFOWCS-WILLIAMS-HAWKINGS EQUATIONS

PASSIVE AND ACTIVE CONTROL OF ACOUSTIC RESONANCE IN CAVITY FLOWS USING FFOWCS-WILLIAMS-HAWKINGS EQUATIONSAbstractIn the aerospace industry, interior storage carriages, that carry items such as weapons and bombs form cavities. The turbulence-cavity interaction causes significant vibration, sound pressure levels, resonance, and structural problems. Therefore, control methods are can be useful to reduce drag, minimize pressure fluctuations and SPL levels. This work studies the passive flow control methods to reduce the noise induced by the flow over the cavity. For this purpose, cavity leading, and trailing edge wall modifications were made such as inclination, placing a block upstream of the cavity, blowing from the cavity walls. Broadband nature of the noise sources is captured generally with DNS or LES approach. Large Eddy Simulations (LES) is used to compute the flow field to reduce computational cost.  ANSYS Fluent software is utilized to solve compressible, two-dimensional, transient subsonic cavity flow.  For the determination of sound pressure levels, Ffowcs-Williams–Hawkings (FW-H) integral method is used.Keywords:  Passive and Active control, compressible flow, Ffowcs-Williams–Hawkings equations, CFD, AeroacousticsKAVİTE BÖLGELERİNDEKİ AKUSTİK REZONANS KONTROLÜ İÇİN AKTİF VE PASİF KONTROL METODLARININ FFOWCS-WILLIAMS-HAWKINGS DENKLEMLERİ YARDIMI İLE İNCELENMESİÖzetHavacılık endüstrisinde uçakların mühimmat depolayan bölümleri kavite olarak adlandırılmaktadır. Kavite bölgesinde, türbülans-kavite etkileşimi önemli ölçekte titreşime, yüksek ses basınç seviyelerine, rezonansa ve yapısal problemlere sebep olmaktadır. Bu sebeplerden ötürü, kavite bölgelerinde meydana gelen basınç salınımını minimize etmek, sürtünme kat sayısını ve ses basınç seviyelerini (SPL) düşürmek amacı ile kontrol metodları geliştirilmekttedir. Bu çalışmada, kavite giriş ve çıkış duvarlarında geometrik modifikasyonlar yaratarak pasif, kavite duvarlarından hava üflemesi yaparak ise aktif akış kontrol yöntemleri geliştirilmiştir.  Akış alanını çözümlemek için LES yaklaşımı kullanılmıştır. Sıkıştırılabilir, iki boyutlu,zamana bağlı değişen ve türbülanslı  kaviye akışı ANSYS Fluent programı kullanılarak modellenmiştir. Ses seviyelerinin belirlenmesi için ise Ffowcs-Williams–Hawkings (FW-H) integral metodu kullanılmıştır.Anahtar Kelimeler: Pasif ve aktif kontrol, sıkıştırılabilir akış, Ffowcs-Williams–Hawkings (FW-H) denklemleri, HAD, aeroakusti