Motivation to Lead and Shared Leadership in Teams

Zeynep Giraylar(Zeynep Giraylar ),Kyoosang Choi(Kyoosang Choi) 한국자료분석학회 2023 Journal of the Korean Data Analysis Society Vol.25 No.1

More companies have started to adopt a model of self-managed team as their primary work design. As work environments get more complex, an appointed leader alone cannot fulfill all the necessary leadership responsibilities of a team. In this manner, the shared leadership within a team is of great importance for today's work environments. The primary purpose of the present study was to examine an antecedent of shared leadership. Focusing on leadership motivation, this study investigated how team members’ motivation to lead affects shared leadership of the team. This study also examined the effects of shared leadership on team performance using an objective team performance measure, which little previous studies have investigated. Data were obtained from 57 teams consisting of 3 to 5 members. They performed a computer-based business strategy game. Findings showed that the teams consisting of members with a high level of motivation to lead scores were positively related to shared leadership and shared leadership significantly predicted team performance. Theoretical and practical implications of this study are also discussed.

Influence of modeling agents on the surface properties of an esthetic nano-hybrid composite

Kutuk Zeynep Bilge,Erden Ecem,Aksahin Damla Lara,Durak Zeynep Elif,Dulda Alp Can 대한치과보존학회 2020 Restorative Dentistry & Endodontics Vol.45 No.2

Objective: The aim of this study was to evaluate the influence of different modeling agents on the surface microhardness (Vickers hardness number; VHN), roughness (Ra), and color change (ΔE) of a nano-hybrid composite with or without exposure to discoloration by coffee. Materials and Methods: Sixty-four cylinder-shaped nano-hybrid composite specimens were prepared using a Teflon mold. The specimens' surfaces were prepared according to the following groups: group 1, no modeling agent; group 2, Modeling Liquid; group 3, a universal adhesive (G-Premio Bond); and group 4, the first step of a 2-step self-adhesive system (OptiBond XTR). Specimens were randomly allocated into 2 groups (n = 8) according to the storage medium (distilled water or coffee). VHN, Ra, and ΔE were measured at 24 hours, 1 week, and 6 weeks. The Kruskal-Wallis test followed by the Bonferroni correction for pairwise comparisons was used for statistical analysis (α = 0.05). Results: Storage time did not influence the VHN of the nano-hybrid composite in any group (p > 0.05). OptiBond XTR Primer application affected the VHN negatively in all investigated storage medium and time conditions (p < 0.05). Modeling Liquid application yielded improved Ra values for the specimens stored in coffee at each time point (p < 0.05). Modeling Liquid application was associated with the lowest ΔE values in all investigated storage medium and time conditions (p < 0.05). Conclusion: Different types of modeling agents could affect the surface properties and discoloration of nano-hybrid composites.

Influence of modeling agents on the surface properties of an esthetic nano-hybrid composite

Kutuk, Zeynep Bilge,Erden, Ecem,Aksahin, Damla Lara,Durak, Zeynep Elif,Dulda, Alp Can The Korean Academy of Conservative Dentistry 2020 Restorative Dentistry & Endodontics Vol.45 No.1

Objective: The aim of this study was to evaluate the influence of different modeling agents on the surface microhardness (Vickers hardness number; VHN), roughness (Ra), and color change (ΔE) of a nano-hybrid composite with or without exposure to discoloration by coffee. Materials and Methods: Sixty-four cylinder-shaped nano-hybrid composite specimens were prepared using a Teflon mold. The specimens' surfaces were prepared according to the following groups: group 1, no modeling agent; group 2, Modeling Liquid; group 3, a universal adhesive (G-Premio Bond); and group 4, the first step of a 2-step self-adhesive system (OptiBond XTR). Specimens were randomly allocated into 2 groups (n = 8) according to the storage medium (distilled water or coffee). VHN, Ra, and ΔE were measured at 24 hours, 1 week, and 6 weeks. The Kruskal-Wallis test followed by the Bonferroni correction for pairwise comparisons was used for statistical analysis (α = 0.05). Results: Storage time did not influence the VHN of the nano-hybrid composite in any group (p > 0.05). OptiBond XTR Primer application affected the VHN negatively in all investigated storage medium and time conditions (p < 0.05). Modeling Liquid application yielded improved Ra values for the specimens stored in coffee at each time point (p < 0.05). Modeling Liquid application was associated with the lowest ΔE values in all investigated storage medium and time conditions (p < 0.05). Conclusion: Different types of modeling agents could affect the surface properties and discoloration of nano-hybrid composites.

Predictors of 3-month mortality with muscle ultrasound and palliative prognostic tools among patients admitted to palliative care units

Zeynep Irmak Kaya,Yelda Öztürk,Sinem Gürcü,Gülgün Uncu,Anıl Uçan,Mert Eşme,Berrin Yalınbaş Kaya,Cafer Balci 대한내과학회 2023 The Korean Journal of Internal Medicine Vol.38 No.4

Background/Aims: Prognostic factors are an important issue in progressive and life-limiting diseases. This study evaluate 3-month mortality in patients admitted to the palliative care unit (PCU). Methods: In this study, the patient’s demographics, comorbidities, nutritional status, and laboratory values were recorded. The palliative performance scale (PPS), the palliative prognostic index (PPI), and the palliative prognostic (PaP) score were calculated. The rectus femoris (RF) cross-sectional area (CSA), RF muscle thickness, gastrocnemius (GC) medialis muscle thickness, pennation angle and fascicle length of the GC were measured by ultrasound for survival prediction. Results: A total of 88 patients enrolled during the study period, with a mean age of 73.6 ± 13.3 years and a 3-month mortality rate of 59.1%. The findings of a multivariable Cox proportional hazards regression model based on age, gender, C-reactive protein level and Nutrition Risk Screening 2002 scores as covariates revealed the PPI and the PaP score to be significant predictors of 3-month mortality. In addition, in the unadjusted Cox proportional hazard regression analysis, the CSA of the RF muscle was also found to be a significant predictor of 3-month mortality. Conclusions: Findings revealed that the combined use of the CSA of the RF, the PPI, and the PaP score are reliable predictors of mortality in patients admitted to the PCU.

Cyclical Dynamics of the Turkish Economy and the Stock Market

Zeynep Senyuz,Emre Yoldas,Ismail Onur Baycan 한국국제경제학회 2014 International Economic Journal Vol.28 No.3

We analyze the cyclical dynamics of the Turkish economy and the stock market as well as their interactions. We use hidden Markov models that are robust to parameter instability arising from major shifts in economic policy, which have been typically observed in the Turkish economy. These models provide estimates of turning points for the growth, business, and stock market cycles. We identify three states of growth cycles and two states of business cycles in Turkey characterized by different mean estimates. We find that the economy went through five recessions since 1987. Crises are characterized by sharp drops in economic activity and are preceded by slowdowns. These crises are typically followed by strong recoveries during which the economy grows above its long-run average rate. We show that the Turkish stock market goes through three regimes having distinct risk-return dynamics. Bear markets associated with negative returns precede every recession with an average lead time of three quarters, suggesting that the stock market may be a useful forward-looking indicator of the Turkish economy.

Analyses of the Structural and the Temperature-Dependent Magnetic Properties of Pine Resin and Pine Bark from the Oltu/Erzurum Region in Turkey

Zeynep Aygun,Necmi Yarbasi 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.7

In the present paper, our aim is to investigate the structural, compositional and temperaturedependent magnetic properties of pine resin and pine bark obtained from a yellow pine forest situated in Oltu/Erzurum, a tertiary depositional area, located on the central area of the Northeast Anatolian Fault Zone. With the purpose of understand the regional effects on pine resin and pine bark obtained from a yellow pine forest, electron paramagnetic resonance spectroscopy is used to determine paramagnetic features at different temperatures (room temperature, 65 ℃, 75 ℃ and 85℃). An X-ray diffraction experiment is performed to obtain the crystalline nature of the resin and the bark. Also, scanning electron microscopy and energy dispersive spectroscopy methods are preferred for analyzing the surface morphology and the elemental composition of the samples, respectively.

La Projection Des Familles Ayant Enfant Handicapé Dans La Littérature: « Avez-vous du Bleu » - « Un Problème Personnel »

Zeynep Kösteloğlu,Seyit Tarık Tülek 고려대학교 응용문화연구소 2023 에피스테메 Vol.- No.29

N’importe où et quelle période qu’ils soient, les parents mettant au monde des bébés en situation, avec leurs caractéristiques physiques ou psychologiques, éprouvent des difficultés par rapport aux familles normales. Le degré de difficulté varie selon la situation de handicap de l’enfant/bébé. C’est pourquoi les mettre au monde en santé occupe une importance au regard d'eux- même, de leur famille et de la société. L'objectif de cette étude est de déceler la situation dans laquelle les individus ayant des enfants à besoins spécifiques, les changements dans leur niveau de vie, la façon dont la société les considère et les effets psychologiques de cette situation sur elles. Deux ouvrages prennent place, l'une par turque et l'autre par littérature japonaise, dans cette étude comparative effectuée. Parallèlement à l'œuvre « Avez-vous du Blue ? » par Uzun Ö, publiée comme une étude autobiographique dans la littérature turque et vue même dans le média ; l’œuvre « Un Problème Personnel » par Kenzaburo Oe rémunérée par le prix Nobel et comme l'une des figures les plus importantes dans la littérature japonaise contemporaine forme le cadre de l'étude. Originellement publié sous le nom de Kojintekina Taiken, « Un Problème Personnel » différencie par l'usage des noms réels des personnes de chez l'autre. Cependant, cela ne change ni l’importance de l’œuvre dans le monde littéraire ni la place de l’auteur dans sa vie privée. Comme ils sont deux de type autobiographique et donnent l'exemple des familles avec un enfant en situation, ces ouvrages différents par deux auteurs de différentes cultures marquent le même dénominateur. Par entremise de cette étude, on tentera de révéler les similitudes, les différences et les modes de vie s'accrochant à la vie parmi des familles ayant un /des enfant(s) handicapé(es). Les troubles que l'on éprouve individuellement parmi les membres de la famille et leur positionnement à un point différent dans la société exigent une approche multifonctionnelle au travail. Par conséquent, les travaux seront discutés en utilisant les données de la psychologie et de la sociologie et évalués dans la méthode éclectique (pluraliste) sous le toit de la littérature scientifique comparative.

No Adverse Outcomes of Video-Assisted Thoracoscopic Surgery Resection of cT2 Non-Small Cell Lung Cancer during the Learning Curve Period

Zeynep Bilgi,Hasan Fevzi Batırel,Bedrettin Yıldızeli,Korkut Bostancı,Tunç Laçin,Mustafa Yüksel 대한흉부외과학회 2017 Journal of Chest Surgery (J Chest Surg) Vol.50 No.4

Background: Video-assisted thoracoscopic surgery (VATS) anatomic lung resections are gradually becoming the standard surgical approach in early-stage non-small cell lung cancer (NSCLC). The technique is being applied in cases of larger tumors depending on the experience of the surgical team. The objective of this study was to compare early surgical and survival outcomes in patients undergoing anatomic pulmonary resections using VATS and thoracotomy techniques for clinical T2 NSCLC during the adaptation period of the surgical team to the VATS approach. Methods: The data of all patients who underwent anatomic pulmonary resection for NSCLC using VATS and open techniques since April 2012 were recorded to create a prospective lung cancer database. Clinical T2 NSCLC patients who underwent VATS anatomic lung resection were identified and compared with cT2 patients who underwent open resection. Results: Between April 2012 and August 2014, 269 anatomical resections for NSCLC were performed (80 VATS and 189 thoracotomy). Thirty-four VATS patients who had clinical T2 disease were identified and stage-matched to thoracotomy patients. The average tumor diameter was comparable (34.2±11.1×29.8±10.1 mm vs. 32.3±9.8×32.5±12.2 mm, p=0.4). Major complications were higher in the thoracotomy group (n=0 vs. n=5, p=0.053). There was no 30-day mortality, and the 2-year survival rate was 91% for VATS and 82% for thoracotomy patients (p=0.4). Conclusion: VATS anatomic resections in clinical T2 NSCLC tumors are safe and have perioperative and pathologic outcomes similar to those of thoracotomy, while remaining within the learning curve.

Assessment of Tissue Perfusion Following Conventional Liposuction of Perforator-Based Abdominal Flaps

Zeynep Deniz Akdeniz Doğan,Bülent Saçak,Doğuş Yalçın,Özgür Pilancı,Fatma Betül Tuncer,Özhan Çelebiler 대한성형외과학회 2017 Archives of Plastic Surgery Vol.44 No.2

Background The effect of liposuction on the perforators of the lower abdominal wall has been investigated in several studies. There are controversial results in the literature that have primarily demonstrated the number and patency of the perforators. The aim of this study was to determine the effect of liposuction on the perfusion of perforator-based abdominal flaps using a combined laser–Doppler spectrophotometer (O2C, Oxygen to See, LEA Medizintechnik). Methods Nine female patients undergoing classical abdominoplasty were included in the study. Perforators and the perfusion zones of the deep inferior epigastric artery flap were marked on the patient’s abdominal wall. Flap perfusion was quantitatively assessed by measuring blood flow, velocity, capillary oxygen saturation, and relative amount of hemoglobin for each zone preoperatively, after tumescent solution infiltration, following elevation of the flap on a single perforator, and after deep and superficial liposuction, respectively. Results The measurements taken after elevation of the flap were not significantly different than measurements taken after the liposuction procedures. Conclusions The liposuction procedure does not significantly alter the perfusion of perforatorbased abdominal flaps in the early period. The abdominal tissue discarded in a classic abdominoplasty operation can be raised as a perforator flap and has been demonstrated to be a unique model for clinical research.

The effect of fiber reinforcement on behavior of Concrete-Filled Steel Tube Section (CFST) under transverse impact: Experimentally and numerically

Zeynep Yaman 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.82 No.2

This study presents an experimental and numerically study about the effects of fiber reinforcement ratio on the behavior of concrete-filled steel tubes (CFST) under dynamic impact loading. In literature have examined the behavior of GFRP and FRP wrapped strengthened CFST elements impact loads. However, since the direction of potential impact force isn't too exact, there is always the probability of not being matched the impact force of the area where the reinforced. Therefore, instead of the fiber textile wrapping method which strengthens only a particular area of CFST element, we used fiber-added concrete-filled elements which allow strengthening the whole element. Thus, the effect of fiber-addition in concrete on the behavior of CFST elements under impact loads was examined. To do so, six simply supported CFST beams were constructed with none fiber, 2% fiber and 10% fiber reinforcement ratio on the concrete part of the CFST beam. CFST beams were examined under two different impact loads (75 kg and 225 kg). The impactors hit the beam from a 2000 mm free fall during the experimental study. Numerical models of the specimens were created using ABAQUS finite element software and validated with experimental data. The obtained results such as; mid-span displacement, acceleration, failure modes and energies from experimental and numerical studies were compared and discussed. Furthermore, the Von Misses stress distribution of the CFST beams with different ratio of fiber reinforcements were investigated numerically. To sum up, there is an optimum amount limit of the fiber reinforcement on CFST beams. Up to this limit, the fiber reinforcement increases the structural performances of the beam, beyond that limit the fiber reinforcement decreases the performances of the CFST beam under transverse impact loadings.