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29 results on '"Ozdemir, Engin"'

8. Optisyenlerin mesleki doyumları ile mesleki bağlılıkları arasındaki ilişkinin incelenmesi

Author

Ozdemir, Engin, Kalmuk, Gulhan, and İstinye Üniversitesi, Sosyal Bilimler Enstitüsü, Sağlık Yönetimi Ana Bilim Dalı

Subjects
Mesleki Doyum, Duygusal Bağlılık, Mesleki Memnuniyet, Optician, Mesleki Bağlılık, Emotional Commitment, Optisyen, Professional Satisfaction, Professional Commitment
Abstract

Mesleki doyum ve mesleki bağlılık kavramları uzun zamandır farklı meslek dallarında incelenmiştir. Ülkemizde ise optisyenler ile ilgili bu konuda yeterli veri bulunmamaktadır. Çalışmamızda bu amaçla İstanbul’da yer alan 600 optisyenlik çalışanına mesleki doyum ve mesleki bağlılık anketleri elektronik posta yoluyla ulaştırılmış ve sonuçlar incelenmiştir. Mesleki doyum ölçeğine bağlı duygusal mesleki bağlılık, mesleki devam bağlılığı; mesleki bağlılık ölçeğine bağlı olarak niteliklere uygunluk, mesleki memnuniyet ve gelişme isteği faktörleri oluşturulmuştur. Korelasyon analizi sonucunda niteliklere uygunluk faktörü ile mesleki bağlılık faktörü arasında yüksek derecede, duygusal bağlılık skoru arasında ise orta derecede pozitif yönde ilişki saptanmıştır. Faktörler ile yapılan regresyon analizi sonucunda niteliklere uygunluk ve gelişme isteği skorlarının duygusal bağlılık üzerinde ve yine niteliklere uygunluk skorunun devam bağlılığı üzerinde istatistiksel olarak anlamlı derecede etkisi olduğu görülmüştür. Sonuç olarak bu çalışmada daha önce diğer meslek gruplarında belirtildiğine benzer bir şekilde, optisyenlerde de iş doyumu ve mesleki bağlılık skorlarının birbirleri ile pozitif yönde ilişkide olduğu saptanmıştır. The concepts of professional satisfaction and professional commitment have been studied in different professions for a long time. In our country, there is not enough data on opticians on this field. For this purpose, in our study, professional satisfaction and professional commitment questionnaires were sent to 600 opticians in Istanbul via e-mail and the results were examined. Emotional professional commitment and professional continuance commitment factors were formed based on professional satisfaction scale. Depending on the scale of professional commitment, the factors of conformity to qualifications, Professional satisfaction and desire for improvement were formed. As a result of the correlation analysis, a high degree of positive correlation was found between the factor of conformity to qualifications and the factor of professional commitment, and a moderate degree of positive relationship between the emotional commitment score. As a result of the regression analysismade with the factors, it was seen that the scores of conformity to qualifications and desire for improvement had a statistically significant effect on emotional commitment, and the score of conformity to qualifications had a statistically significant effect on continuance commitment.As a result, in this study, it was determined that job satisfaction and professional commitment scores were positively related to each other in opticians, similar to what was previously stated in other occupational groups.

Published
2021

11. Energy economy with a variable speed drive in an oxygen trim controlled boiler house

Author

Kilicaslan, Ibrahim and Ozdemir, Engin

Subjects
Boilers -- Management, Boilers -- Research, Energy management systems -- Research, Heating -- Equipment and supplies, Company business management, Engineering and manufacturing industries, Petroleum, energy and mining industries, Science and technology
Abstract

This paper investigates the potentional for energy saving in a boiler house that can be achieved through installing a variable speed drive (VSD) for the fan motor by including an oxygen trim control cycle. This investigation is carried out through surveys; energy saving calculations are based on experimental data. In particular, some unique energy saving measures and energy efficiency improvements in the boiler associated with the VSD system are analytically and experimentally studied. In this study, the relation between excess air ratio and boiler efficiency was investigated in a water tube boiler that has the capacity of producing 55 tons of steam per unit time at 245[degrees]C and 20 bar pressure. The boiler combustion air is supplied from a fan driven by a 30 kW 1450 rpm induction motor. Since the fan motor running at nominal speed has supplied the same airflow rate, excess air amount and exhaust gas temperature were very high at low loads. The boiler efficiency was low due to thermal energy losses and also consequently led to electrical energy losses. After implementation of the VSD, stack temperature was reduced from 200[degrees]C to 142[degrees]C, so the boiler efficiency was increased about 2.5% and 8000 kWh of electrical energy were saved in a month. The energy losses associated with excess air rate and its cost to manufacturers are evaluated and guaranteed. An overview and analysis of such conservation measures, along with the potential energy and cost savings, the implementation cost, and simple payback period are also given. Keywords: Energy Saving, Oxygen Trim Control, Boiler, Variable Speed Drive

Published
2005

29. Synchronous-Reference-Frame-Based Control Method for UPQC Under Unbalanced and Distorted Load Conditions.

Author

Kesler, Metin and Ozdemir, Engin

Subjects
*ELECTRIC potential, *ELECTRONIC control, *PHASE-locked loops, *ELECTRIC filters, *PHYSICAL measurements, *ELECTRICAL harmonics, *PROTOTYPES, *ELECTRIC power distribution
Abstract

This paper presents a new synchronous-reference-frame (SRF)-based control method to compensate power-quality (PQ) problems through a three-phase four-wire unified PQ conditioner (UPQC) under unbalanced and distorted load conditions. The proposed UPQC system can improve the power quality at the point of common coupling on power distribution systems under unbalanced and distorted load conditions. The simulation results based on Matlab/Simulink are discussed in detail to support the SRF-based control method presented in this paper. The proposed approach is also validated through experimental study with the UPQC hardware prototype. [ABSTRACT FROM AUTHOR]

Published
2011
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