Novi lokaliteti nalaza stranih vrsta kozica Penaeus aztecus (Ives, 1891) i Metapenaeus affinis (H. Milne Edwards, 1837) u Egejskom moru

New findings about the distribution area of Penaeus aztecus and Metapenaeus affinis were reported with this study. Diagnostic features of the both species and some morphometric measures of the specimens were given. In addition, the recent occurrence map of these species in the Mediterranean Sea is provided.Novi nalazi kozica Penaeus aztecus i Metapenaeus affinis predstavljeni su u ovom radu, te su iznesene dijagnostičke značajke obje vrste i neka morfometrijska mjerenja uzoraka. Osim toga, prikazana je i nova mapa nalaza ovih vrsta u Mediteranu

On the Influence of Grouping Practices on Classroom Teaching

The article starts with a historical overview, discusses the arguments for and against ability grouping. It surveys the literature on different practices of grouping that exist in the American and British literature. The study mainly focuses on instructional grouping practices based on ability and on cooperation. It discusses arguments for and against ability grouping. The study also presents information about the use of mastery learning with cooperative strategies

On The Hecke Eigenforms of Half-Integral Weight and Dedekind-Eta Products

Systematic choice of the Hecke eigenforms of half-integral weight is an interesting problem in the theory of modular forms. In this paper, we find all Dedekind-eta products of half-integral weight which are Hecke eigenforms up to weight 15/2 with varying levels. Proof is based on the Shimura lift

Decomposition methods for dynamic room allocation in hotel revenue management

Long-term stays are quite common in the hotel business. Consequently, it is crucial for the hotel managements to consider the allocation of available rooms to a stream of customers requesting to stay multiple days. This requirement leads to the solving of dynamic network revenue management problems that are computationally challenging. A remedy is to apply decomposition approaches so that an approximate solution can be obtained by solving many simpler problems. In this study, we investigate several room allocation policies in hotel revenue management. We work on various decomposition methods to find reservation policies for advance bookings and stay-over customers. We also devise solution algorithms to solve the resulting problems efficiently

Recreational Fishing on the Coastal Hot Spots of Izmir Inner Bay (Aegean Sea, Turkey) : Socio-economics and Management Implications

In this study, we analyzed social and economic dimensions of shore-based recreational fishing (RF) along Izmir Inner Bay in the Metropolitan Province Izmir of Turkey. 634 shore-based recreational fishers were interviewed via on-site face-to-face interviews during the fishing activity from January to December in 2016. Market value approach was utilized to calculate net economic values and expenses of recreational fishers along in eight coastal districts, Goztepe, Karatas, Konak, Pasaport, Alsancak, Bayrakli, Karsiyaka and Bostanli along the coast of the inner bay. The annual fishing efforts demonstrated significant differences among districts. For example; Bostanli fishers that have higher education levels with higher income spent higher time for RF but, finally, this attitude of Bostanli fishers resulted in low CPUE levels. Considering the RF experience of Bostanli fishers, they are either not likely or able to target or catch bigger or more fish. In contrast, Goztepe fishers seems much professional compared to fishers by having the highest amount of catch in shortest time compared to rest of the districts. The highest mean CPUE was observed for Goztepe, Karatas and Konak fishers even so, these CPUE amounts were much under the ones determined in previous studies in Turkey. Considering the catch composition of fishers, S. auratus was the most common catch for all fishers. Secondly, D. labrax and Mugilid species constituted the majority. High fishing related expenditures were observed in all districts, then harvesting values reached quite high levels considering the previous studies. To conclude, RF in Izmir Inner Bay of Turkey is great social and economic activity by generating increase in RF related expenditures, jobs and indirect economic activity in services sector. The results of this study provide an update information of the recreational fishers' profile to help regulate recreational fishery.Peer reviewe

Delayed purchase options in single-leg revenue management

Many airline reservation systems offer the commitment option to their potential passengers. This option allows passengers to reserve a seat for a fixed duration before making a final purchase decision. In this study, we develop single-leg revenue management models that consider such contingent commitment decisions. We start with a dynamic programming model of this problem. This model is computationally intractable as it requires storing a multidimensional state space because of bookkeeping of the committed seats. To alleviate this difficulty, we propose an alternate dynamic programming formulation that uses an approximate model of how the contingent commitments behave and we show how to extract a capacity allocation policy from the approximate dynamic programming formulation. In addition, we present a deterministic linear programming model that gives an upper bound on the optimal expected revenue from the intractable dynamic programming model. As the problem size becomes large in terms of flight capacity and the expected number of arrivals, we demonstrate an asymptotic lower bound for the deterministic linear programming model. Our extensive numerical study indicates that offering commitment options can noticeably increase potential revenue even though offering a contingent commitment option may not always be in the best interest of the airline. Also, our results show that the proposed approximate dynamic programming model coordinates capacity allocation and commitment decisions quite well

Physical and physiological characteristics of baseball trained adolescents

The aim of the study is to contrast the physical characteristics of 13-16 years old baseball trained adolescents with the same age sedentary adolescents. Baseball trained adolescents (n=10), who were trained approximately 45 ± 10.67 month, and inactive adolescents (n=14) participated in this research voluntarily. Sit and reach flexibility test, 10-20-30 meter sprint test, active and squat jump tests, hand grip strength test, Wingate anaerobic power test were used to evaluate the physical characteristics of baseball trained adolescents and sedentary adolescents. As a result of the research there is no significant difference between the sedentary adolescents’ and baseball trained adolescents’ age, height, body mass, BMI, body fat percentage and sit-reach flexibility test values. There is a significant difference between the sedentary adolescents’ and baseball trained adolescents’ active and squat jump test, 10-20-30 meter sprint test, left and right hand grip strength test values (p≤0.05). Baseball play trained adolescents’ active and squat jump test, 10-20-30 meter sprint test, left and right hand grip strength test values were found statistically higher than values of sedentary adolescents. Baseball trained adolescents’ absolute peak power and absolute average power were determined higher than sedentary adolescents but no difference was found between the relative peak power, relative average power

Novi lokaliteti nalaza stranih vrsta kozica Penaeus aztecus (Ives, 1891) i Metapenaeus affinis (H. Milne Edwards, 1837) u Egejskom moru

New findings about the distribution area of Penaeus aztecus and Metapenaeus affinis were reported with this study. Diagnostic features of the both species and some morphometric measures of the specimens were given. In addition, the recent occurrence map of these species in the Mediterranean Sea is provided.Novi nalazi kozica Penaeus aztecus i Metapenaeus affinis predstavljeni su u ovom radu, te su iznesene dijagnostičke značajke obje vrste i neka morfometrijska mjerenja uzoraka. Osim toga, prikazana je i nova mapa nalaza ovih vrsta u Mediteranu

Masking primal and dual models for data privacy in network revenue management

We study a collaborative revenue management problem where multiple decentralized parties agree to share some of their capacities. This collaboration is performed by constructing a large mathematical programming model that is available to all parties. The parties then use the solution of this model in their own capacity control systems. In this setting, however, the major concern for the parties is the privacy of their input data, along with their individual optimal solutions. We first reformulate a general linear programming model that can be used for a wide range of network revenue management problems. Then we address the data privacy concern of the reformulated model and propose an approach based on solving an equivalent data-private model constructed with input masking via random transformations. Our main result shows that, after solving the data-private model, each party can safely access only its own optimal capacity allocation decisions. We also discuss the security of the transformed problem in the considered multi-party setting. Simulation experiments are conducted to support our results and evaluate the computational efficiency of the proposed data-private model. Our work provides an analytical approach and insights on how to manage shared resources in a network problem while ensuring data privacy. Constructing and solving a collaborative network problem requires information exchange between parties that may not be possible in practice. Including data privacy in decentralized collaborative network revenue management problems with capacity sharing is new to the literature and relevant to practice

Correction: The effect of activated protein C on experimental acute necrotizing pancreatitis

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