Effects of Price Transmission and Exchange Rate Elasticities of Three Developing Countries on the World Cotton Trade

This paper examines (i) whether the government interventions in the forms of border protection and as price support have weakened the integrations of domestic cotton markets of China, Brazil and Turkey with the world cotton market and (ii) how a weak cointegration of a domestic market with international market affects the world cotton trade. We address the first question by estimating price and exchange rates transmission elasticities using an error correction model and the second question by conducting a partial equilibrium model. Results indicate that the estimated elasticities are significantly smaller than unitary, which suggests that the cointegration is weak and the law of one price (LOP) does not hold. Furthermore, when cointegration is weak, exchange rate movements have lower impact on exports, imports and prices than they do in the case of strong cointegration

Implications of non-volatile memory as primary storage for database management systems

Traditional Database Management System (DBMS) software relies on hard disks for storing relational data. Hard disks are cheap, persistent, and offer huge storage capacities. However, data retrieval latency for hard disks is extremely high. To hide this latency, DRAM is used as an intermediate storage. DRAM is significantly faster than disk, but deployed in smaller capacities due to cost and power constraints, and without the necessary persistency feature that disks have. Non-Volatile Memory (NVM) is an emerging storage class technology which promises the best of both worlds. It can offer large storage capacities, due to better scaling and cost metrics than DRAM, and is non-volatile (persistent) like hard disks. At the same time, its data retrieval time is much lower than that of hard disks and it is also byte-addressable like DRAM. In this paper, we explore the implications of employing NVM as primary storage for DBMS. In other words, we investigate the modifications necessary to be applied on a traditional relational DBMS to take advantage of NVM features. As a case study, we have modified the storage engine (SE) of PostgreSQL enabling efficient use of NVM hardware. We detail the necessary changes and challenges such modifications entail and evaluate them using a comprehensive emulation platform. Results indicate that our modified SE reduces query execution time by up to 40% and 14.4% when compared to disk and NVM storage, with average reductions of 20.5% and 4.5%, respectively.The research leading to these results has received funding from the European Union’s 7th Framework Programme under grant agreement number 318633, the Ministry of Science and Technology of Spain under contract TIN2015-65316-P, and a HiPEAC collaboration grant awarded to Naveed Ul Mustafa.Peer ReviewedPostprint (author's final draft

The Russia-Ukraine war, soaring food prices, and the Turkish economy: insights from computable general equilibrium

The ongoing war between Russia and Ukraine has led to considerable human suffering and raised concerns regarding the potential implications for the global economy. Türkiye, as a neighboring country and a major player in the region, maintains close ties with Ukraine and Russia and heavily relies on agricultural imports from both countries making it susceptible to market shocks caused by the war. In this research paper, we examine the economic impact of war-induced soaring food prices on the Turkish economy using a Computable General Equilibrium (CGE) model, which is a widely used tool for simulating the effects of shocks and policy changes on a country’s economy. We considered two utility functions with varying elasticity parameters to explore both micro-level and macro-level impacts of the price shock, encompassing household demand, industrial production, price and trade dynamics, income, investment, and welfare implications. The findings reveal significant effects on agricultural imports of crops (wheat, maize, barley, rice, and cereal grains), fruit and vegetables, and oil products, leading to an increase in both import and domestic prices, resulting in food inflation in the country. Additionally, the findings show that while the trade balance for the agricultural sector improved, the services, manufacturing, and forestry sectors have experienced an increased trade deficit. Furthermore, the war has caused a decline in foreign direct investment flowing into the country. Finally, the war-led price shock resulted in an estimated income loss of 0.2 or 0.8 percent of real GDP depending on the utility function, and a significant welfare loss. Based on these findings, several policy recommendations were discussed. The findings of the study highlight the importance of considering the interplay between food prices and micro and macroeconomic indicators

The effect of supply chain agility on firm performance during COVID-19 pandemic: the mediating and moderating role of demand stability

The aim of this paper is to analyse the effects of supply chain agility on firm performance and the role of demand stability in this relationship. Within the scope of the research, by establishing a SEM (structural equation modelling), effects of supply chain agility and demand stability on firm performance were investigated. In addition, the effect of supply chain agility on demand stability is also observed. Analyzes have shown that during COVID-19 pandemic period, supply chain agility positively affects demand stability and firm performance. In addition, demand stability has positively affected firm performances. The mediating role of demand stability was analysed with the Process Macro method and its moderating effect was analysed with multiple regression. Analysis results showed that demand stability has a mediating role in the effect of supply chain agility on firm performance, but it doesn't have a moderating role

Self-perceived Body Weight Status and Weight-control Behaviors of High School Students in a Southern City of Turkey

Defining »healthy weight« is not easy and for an adolescent with all concerns about newly developing physiognomy it is even harder. The aim of this study was to find out the frequency of obesity and the association between the body mass index (BMI), weight-control behaviors and self-perceived body weight status in high school students of a southern city of Turkey. The students from 10 schools were randomly selected among 46,271 students of 72 high schools in Adana from 1999 to 2000. The response rate was 94.8% (2,352/2480). The Turkish version of Youth Risk Behavior Survey Questionnaire (YRBSQ) was completed by the students. The students’ weights and heights were measured. The mean age was 16.5±1.0 years of age (range=14–21 years). The mean BMI was 21.0±3.1, 25.5% of students were underweight, 65.7% were normal, 6.4% were overweight and 2.3% were obese (p=0.0001). Of all students, 24.3% defined themselves as thin, 45.3% as normal, 24.9% as overweight and 5.5% as obese (p=0.0001). The percentage of girls defining their body weight as overweight and obese was significantly higher than the boys (p=0.0001). Of all students, 35.5% wanted to lose weight, 22.3% wanted to gain weight, 27.8% wanted to keep their current weight. Intention (p=0.0001) and interventions to lose weight such as going on a diet (p=0.0001), provocative vomiting (p=0.0001) and 24-hours starving (p=0.0001) were significantly higher in girls than boys. Of students, 26.8% (n=620) were on a diet program either to lose or to keep their body weight. There was significant relationship between being on a diet program and intention to change body weight (p=0.047). We concluded that adolescents living in Adana have relatively higher risk of being underweight than being obese and have unhealthy weight changing plans due to their misperception of their body images. Adolescents may be unconscious on plans and attempts to change their body weights and nutrition and we suggest that education on nutrition and health is required for adolescents

Olfactory Neuroblastomas: An Experience of 24 Years

Objective. The aim of this study was to evaluate clinicopathological findings and the efficacy of the treatment modalities used in patients with olfactory neuroblastomas. Study Design. Retrospective record review. Setting. Istanbul University, Cerrahpasa Medical Faculty, medical oncology outpatient clinic. Subjects and Methods. There were 3 stage A tumors, 5 stage B and 11 stage C according to the Kadish staging system. There were 5 grade I/II and 12 grade III/IV according to the Hyams' histopathologic system. Involvement to orbita was detected in eight patients at the time of diagnosis. Results. The median follow-up period was 23.7 months. The 5-year survival rate for the whole group was 26%. The stage A/B groups exhibited a better survival rate than the C group with 2-year survival rates being 25 versus 71% respectively (P = .008). The grade I/II groups exhibited a better survival rate than the grade III/IV groups with 2-year survival rates being 50 versus 16% respectively (P = .001). The group who had orbital involvement exhibited a poor survival rate than the group of patients who had no involvement of the orbital. Conclusion. In our study, tumor stage, histopathologic grading, involvement of the orbita, brain and bone marow metastases were the statistically significant prognostic factors

Evaluation and Management of Antrochoanal Polyps

Antrochoanal polyps (ACPs) are benign polypoid lesions arising from the maxillary antrum and they extend into the choana. They occur more commonly in children and young adults, and they are almost always unilateral. The etiopathogenesis of ACPs is not clear. Nasal obstruction and nasal drainage are the most common presenting symptoms. The differential diagnosis should include the causes of unilateral nasal obstruction. Nasal endoscopy and computed tomography scans are the main diagnostic techniques, and the treatment of ACPs is always surgical. Functional endoscopic sinus surgery (FESS) and powered instrumentation during FESS for complete removal of ACPs are extremely safe and effective procedures. Physicians should focus on detecting the exact origin and extent of the polyp to prevent recurrence

Draft Genome Sequences of Two Heat-Resistant Mutant Strains (A52 and B41) of the Photosynthetic Hydrogen-Producing BacteriumRhodobacter capsulatus

The draft genome sequences of two heat-resistant mutant strains, A52 and B41, derived from Rhodobacter capsulatus DSM 1710, and with different hydrogen production levels, are reported here. These sequences may help understand the molecular basis of heat resistance and hydrogen production in R. capsulatus.Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)Publisher's Versio