Predicting the failure modes of monotonically loaded reinforced concrete exterior beam-column joints

Pelin G. Bakir,HasanM.Bodurolu 국제구조공학회 2002 Structural Engineering and Mechanics, An Int'l Jou Vol.14 No.6

Shelby D. Hunt’s legacy, the R-A theory of competition, and its perspective on the geographical indications (GIs) debate

Pelin Bicen 한국마케팅과학회 2021 마케팅과학연구 Vol.31 No.2

The article highlights Dr. Shelby Hunt’s major contribution to the interminable discussions in the field of competition in general, and most specifically in the role of institutions and public policy promoting productivity and economic growth. The article specifically focuses on Hunt’s legacy, Resource-Advantage Theory of Competition, and its core concepts to guide our understanding in one of the most heated debates in the international trade discussions: Geographical Indications (GI) and their impact on the competitive nature of global trade. Geographical Indications (GI) are collective intellectual property (IP) rights for agri-food products that highlight the unique tie between the quality of the GI product and the territory where it is produced and/or processed. This tie encompasses both physical (i.e. soil, climate, local variety and breed) and human-related factors (i.e. local know-how, specific skills, historical traces). The heated debate regarding the nature and scope of GIs policies and whether these policies foster or hinder competition takes considerable attention in global trade agreements. Founding my arguments on Hunt’s Resource-Advantage theory, a dynamic theory of competition, I argue that GIs policies are pro-competition and provide the agrifood producers with productivity tools and, thereby, have the potential to foster regional economic growth and prosperity. The article highlights Dr. Shelby Hunt’s major contribution to the interminable discussions in the field of competition in general, and most specifically in the role of institutions and public policy promoting productivity and economic growth. The article specifically focuses on Hunt’s legacy, Resource-Advantage Theory of Competition, and its core concepts to guide our understanding in one of the most heated debates in the international trade discussions: Geographical Indications (GI) and their impact on the competitive nature of global trade. Geographical Indications (GI) are collective intellectual property (IP) rights for agri-food products that highlight the unique tie between the quality of the GI product and the territory where it is produced and/or processed. This tie encompasses both physical (i.e. soil, climate, local variety and breed) and human-related factors (i.e. local know-how, specific skills, historical traces). The heated debate regarding the nature and scope of GIs policies and whether these policies foster or hinder competition takes considerable attention in global trade agreements. Founding my arguments on Hunt’s Resource-Advantage theory, a dynamic theory of competition, I argue that GIs policies are pro-competition and provide the agrifood producers with productivity tools and, thereby, have the potential to foster regional economic growth and prosperity.

A comparative study on the subspace based system identification techniques applied on civil engineering structures

Pelin Gundes Bakir,Serhat Alkan,Ender Mete Eksioglu 국제구조공학회 2011 Smart Structures and Systems, An International Jou Vol.7 No.2

The Subspace based System Identification Techniques (SSIT) have been very popular within the research circles in the last decade due to their proven superiority over the other existing system identification techniques. For operational (output only) modal analysis, the stochastic SSIT and for operational modal analysis in the presence of exogenous inputs, the combined deterministic stochastic SSIT have been used in the literature. This study compares the application of the two alternative techniques on a typical school building in Istanbul using 100 Monte Carlo simulations. The study clearly shows that the combined deterministic stochastic SSIT performs superior to the stochastic SSIT when the techniques are applied on noisy data from low to mid rise stiff structures.

Experimental assessment of the piezoelectric transverse d15 shear sensing mechanism

Pelin Berik,Ayech Benjeddou,Michael Krommer 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.4

The piezoelectric transverse d15 shear sensing mechanism is firstly assessed experimentally for a cantilever smart sandwich plate made of a piezoceramic axially poled patched core and glass fiber reinforced polymer composite faces. Different electrical connections are tested for the assessment of the sensor performance under a varying amplitude harmonic (at 24 Hz) force. Also, the dynamic response of the smart sandwich composite structure is monitored using different acquisition devices. The obtained experimentally sensed voltages are compared to those resulting from the benchmark three-dimensional piezoelectric coupled finite element simulations using a commercial code where realistic features, like equipotential conditions on the patches\' electrodes and mechanical updating of the clamp, are considered. Numerically, it is found that the stiffness of the clamp, which is much softer than the ideal one, has an enormous influence on the sensed voltage of its adjacent patch; therefore, sensing with the patch on the free side would be more advantageous for a cantilever configuration. Apart from confirming the latter result, the plate benchmark experimental assessment showed that the parallel connection of its two oppositely poled patches has a moderate performance but better than the clamp side patch acting as an individual sensor. Key

Piezoceramic d15 shear–induced direct torsion actuation mechanism: a new representative experimental benchmark

Pelin Berik,Ayech Benjeddou,Michael Krommer 국제구조공학회 2013 Smart Structures and Systems, An International Jou Vol.12 No.5

A new piezoceramic d15 shear-induced torsion actuation mechanism representative benchmark is proposed and its experimentations and corresponding 3D finite element (FE) simulations are conducted. For this purpose, a long and thin smart sandwich cantilever beam is dimensioned and built so that it can be used later for either validating analytical Saint Venant-type solutions or for analyzing arm or blade-based smart structures and systems applications. The sandwich beam core is formed by two adjacent rows of 8 oppositely axially polarized d15 shear piezoceramic patches, and its faces are dimensionally identical and made of the same glass fiber reinforced polymer composite material. Quasi-static and static experimentations were made using a point laser sensor and a scanning laser vibrometer, while the 3D FE simulations were conducted using the commercial software ABAQUS®. The measured transverse deflection by both sensors showed strong nonlinear and hysteretic (static only) variation with the actuation voltage, which cannot be caught by the linear 3D FE simulations.

The combined deterministic stochastic subspace based system identification in buildings

Pelin Gundes Bakir 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.38 No.3

The Combined Deterministic Stochastic Subspace based System Identification Technique (CDSSSIT) is a powerful input-output system identification technique which is known to be always convergent and numerically stable. The technique determines a Kalman state sequence from the projection of the output-input data. The state space matrices are determied subsequently from this Kalman state sequence using least squares. The objective of this paper is to examine the efficiency of the CDSSSIT in identifying the modal parameters (frequencies and mode shapes) of a stiff structure. The results show that the CDSSSIT predicts the modal parameters of stiff buildings quite accurately but is very sensitive to the location of sensors.

The Role of Microaspiration in the Pathogenesis of Gastroesophageal Reflux-related Chronic Cough

( Pelin Ozdemir ),( Munevver Erdinc ),( Rukiye Vardar ),( Ali Veral ),( Serdar Akyildiz ),( Ozer Ozdemir ),( Serhat Bor ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2017 Journal of Neurogastroenterology and Motility (JNM Vol.23 No.1

Background/Aims Gastroesophageal reflux disease (GERD) is one of the main causes of chronic cough. We evaluated the role of microaspiration in the pathogenesis of reflux-related cough by determining the amount of lipid-laden macrophages (LLMs) in bronchoalveolar lavage (BAL) specimens. Methods A total of 161 cases of chronic cough were evaluated, and 36 patients (average age 48.2 years) were recruited for this single center prospective study. Patients with a history of smoking, angiotensin converting enzyme inhibitor usage, any abnormality on pulmonary function tests, abnormal chest X-rays, occupational or environmental exposures, or upper airway cough syndrome were excluded. GERD was evaluated by 24-hour esophageal impedance-pH monitoring. BAL specimens for LLM determination were obtained from 34 patients by flexible bronchoscopy. Results Patients with pathological intra-esophageal reflux according to multichannel intraluminal impedance and pH monitoring had higher LLM positivity in BAL specimens than patients without pathological reflux (8/14 in reflux positive group vs 1/22 in reflux negative group; P = 0.004). The BAL cell distribution was not different between the 2 groups (P = 0.574 for macrophages, P = 0.348 for lymphocytes, P = 0.873 for neutrophils and P = 0.450 for eosinophils). Conclusions Our results confirm the role of the microaspiration of refluxate in the pathogenetic mechanism of chronic cough. While bronchoscopy is indicated in patients with chronic cough, in addition to the routine airway evaluation, BAL and LLM detection should be performed. LLM can be used to diagnose aspiration in reflux-related chronic cough. Future studies are needed to evaluate the response to antireflux medications or surgery in patients with LLM positivity. (J Neurogastroenterol Motil 2017;23:41-48)

Effect of Feelings of Guilt and Shame on Life Quality of Women in Menopause

( Pelin Zivdir ),( Rabia Sohbet ) 대한폐경학회 2017 대한폐경학회지 Vol.23 No.1

Objectives: Current study was conducted between September 2014 and January 2015 in Gaziantep proviency Sehitkamil town Sirinevler district. Purpose of the study is to measure changes experienced, point of view on menopause, and life style of women who are older than 40, living in said district, and within post-menopause and how these factors effected their feelings of guilt and shame. Methods: Out of universe consisting of 800 women, 500 participants have joined the study. Data collected by personal information form, Guilt-Shame scales, and World Health Organization quality of life (WHOQOL-BREF) scales. SPSS 18 was used to conduct statistical analysis. Results: Analysis indicated that 78.6% of the participants was not literate, 37.8% of the participants were was subjected to domestic violence. Fifty-five percent of the participants were found to see menopause as a predicament, 45.4% as a disease, and 56% as infertility. Results of scales are as follows; guilt factor 48.95 ± 0.37, shame factor 44.89 ± 0.27, body 10.64 ± 0.42, mental 10.96 ± 0.39, social 11.12 ± 0.49, environment 10.84 ± 0.37. Conclusions: No significant correlation found between Guilt: body, mental, social, and environmental area (P < 0.05). It was found that there is a significant correlation between the thought that menopause is not a bad thing and the perceived guilt (P < 0.001). Results of analyses indicate that information about menopause significantly correlates between perceived guilt (P < 0.05). Current study found that as perceived shame and guild increases, the life quality of the sample decreases and the average life quality of the sample is below average. (J Menopausal Med 2017;23:5-14)

Evaluation of malnutrition status and related risk factors in geriatric outpatient clinic

Pelin Cin,Ozlem Tanrıover,Hakan Yavuzer,Deniz Suna Erdincler 한국영양학회 2021 Nutrition Research and Practice Vol.15 No.4

BACKGROUND/OBJECTIVES: Malnutrition risk and malnutrition among the elderly is a public health concern. In combating this health-related problem, it is critically important to evaluate the risk factors in a multidimensional way and to apply appropriate nutrition intervention based on the results. SUBJECTS/METHODS: A cross-sectional study was conducted on 215 elderly patients (32.6% male, 67.4% female) in a geriatric outpatient clinic of a hospital in Turkey. Nutritional questionnaires that incorporated the 24-h recall method were applied to determine general characteristics of patients, their health status, nutritional habits, and daily energy and nutrient intakes. Mini Nutritional Assessment was used to determine nutritional status. Relevant anthropometric measurements were obtained. RESULTS: The subjects" mean age was 76.1 ± 7.0 years, and the prevalence of malnutrition (n = 7) and risk of malnutrition (n = 53) among the 215 subjects was 3.2% and 24.7%, respectively. Patients with malnutrition or risk of malnutrition were found to be single, have a depression diagnosis, in an older age group, have less appetite, more tooth loss, have more frequent swallowing/chewing difficulty, and have more frequent meal skipping. In addition, mean daily energy, carbohydrate, fat, fiber, vitamin E, vitamin B1, vitamin B2, vitamin B6, vitamin C, folates, potassium, magnesium, phosphorus, iron intake, and water consumption were found to be statistically significantly low in subjects with malnutrition or risk of malnutrition. After performing regression analysis to determine confounding factors, malnutrition risk was significantly associated with marital status, loss of teeth, appetite status, and depression. CONCLUSIONS: Routine nutritional screening and assessment of the elderly should be performed. If nutritional deficiencies cannot be diagnosed early and treated, self-sufficiency in the elderly may deteriorate, resulting in increased institutionalization.

Instrumentation and system identification of a typical school building in Istanbul

Pelin Gundes Bakir 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.43 No.2

This study presents the findings of the structural health monitoring and the real time system identification of one of the first large scale building instrumentations in Turkey for earthquake safety. Within this context, a thorough review of steps in the instrumentation, monitoring is presented and seismic performance evaluation of structures using both nonlinear pushover and nonlinear dynamic time history analysis is carried out. The sensor locations are determined using the optimal sensor placement techniques used in NASA for on orbit modal identification of large space structures. System identification is carried out via the stochastic subspace technique. The results of the study show that under ambient vibrations, stocky buildings can be substantially stiffer than what is predicted by the finite element models due to the presence of a large number of partitioning walls. However, in a severe earthquake, it will not be safe to rely on this resistance due to the fact that once the partitioning walls crack, the bare frame contributes to the lateral stiffness of the building alone. Consequently, the periods obtained from system identification will be closer to those obtained from the FE analysis. A technique to control the validity of the proportional damping assumption is employed that checks the presence of phase difference in displacements of different stories obtained from band pass filtered records and it is confirmed that the ”proportional damping assumption” is valid for this structure. Two different techniques are implemented for identifying the influence of the soil structure interaction. The first technique uses the transfer function between the roof and the basement in both directions. The second technique uses a pre-whitening filter on the data obtained from both the basement and the roof. Subsequently the impulse response function is computed from the scaled cross correlation between the input and the output. The overall results showed that the structure will satisfy the life safety performance level in a future earthquake but some soil structure interaction effects should be expected in the North South direction.