Yaşamından bir kesit ve Ankara

Taha Toros Arşivi, Dosya No: 9-Ahmet Adnan SaygunUnutma İstanbul projesi İstanbul Kalkınma Ajansı'nın 2016 yılı "Yenilikçi ve Yaratıcı İstanbul Mali Destek Programı" kapsamında desteklenmiştir. Proje No: TR10/16/YNY/010

Occupational health and safety problems in health workers

Çalışma ortamları çeşitli sağlık ve güvenlik tehlikelerini barındırmaktadır. Bu tehlikeler bireyin sağlığını doğrudan etkileyebilecek meslek hastalıkları ve iş kazalarına neden olmaktadır. İş sağlığı ve iş güvenliği bakımından önemli riskler taşıyan çalışma alanlarından biri de Sağlık Hizmet Alanı’dır. Sağlık çalışanları Sağlık hizmetlerinin birçok alanında, özellikle de hastanelerde, biyolojik, kimyasal, fiziksel, ergonomik, psiko-sosyal risklerle karşı karşıyadır. Ülkemizde yapılan pek çok araştırma, son yıllarda bu sorunların ciddi boyutlara ulaştığını, çalışanların meslek etkinliklerini yerine getirmede engeller oluşturduğunu bildirmektedir ayrıca bu araştırmalar sağlık çalışanlarına, sağlıklı ve güvenli çalışma ortamı sağlayabilmek için çağdaş iş sağlığı uygulamalarına gereksinim olduğunu ortaya çıkarmıştır.There are many health and safety risks in occupational environment. These are causing occupational diseases and accidents that can directly affect individual’s health. One of the hazardous occupational places is health service area. Health workers are experienced with biological, chemical, physical, ergonomic and psycho-social risks in health service areas, especially in hospitals. Many researches from our country inform that these problems reached serious levels in last years and caused difficulties on performing professional efficiencies of workers. Additionally, these researches denote the requirements of contemporary work health practices for providing healthy and safety work environment for health workers

Polar codes for distributed source coding

Ankara : The Department of Electrical and Electronics Engineering and The Graduate School of Engineering and Science of Bilkent Univesity, 2014.Thesis (Ph. D.) -- Bilkent University, 2014.Includes bibliographical references leaves 164-170.Polar codes were invented by Arıkan as the first “capacity achieving” codes for binary-input discrete memoryless symmetric channels with low encoding and decoding complexity. The “polarization phenomenon”, which is the underlying principle of polar codes, can be applied to different source and channel coding problems both in single-user and multi-user settings. In this work, polar coding methods for multi-user distributed source coding problems are investigated. First, a restricted version of lossless distributed source coding problem, which is also referred to as the Slepian-Wolf problem, is considered. The restriction is on the distribution of correlated sources. It is shown that if the sources are “binary symmetric” then single-user polar codes can be used to achieve full capacity region without time sharing. Then, a method for two-user polar coding is considered which is used to solve the Slepian-Wolf problem with arbitrary source distributions. This method is also extended to cover multiple-access channel problem which is the dual of Slepian-Wolf problem. Next, two lossy source coding problems in distributed settings are investigated. The first problem is the distributed lossy source coding which is the lossy version of the Slepian-Wolf problem. Although the capacity region of this problem is not known in general, there is a good inner bound called the Berger-Tung inner bound. A polar coding method that can achieve the whole dominant face of the Berger-Tung region is devised. The second problem considered is the multiple description coding problem. The capacity region for this problem is also not known in general. El Gamal-Cover inner bound is the best known bound for this problem. A polar coding method that can achieve any point on the dominant face of El Gamal-Cover region is devised.Önay, SaygunPh.D

Hepatit B virüsüne karşı aşılamada uzun süreli korunma için booster doz gerekliliğinin (in vivo ve in vitro) araştırılması

Aim: Studies have shown that no booster dose was required at least 10 to 15 years after a primary vaccination for individuals who developed protective anti-hepatitis B surface (anti-HBs) antibodies. In this study, booster dose requirement for HBV after primary immunization was investigated. Materials and Methods: Seventeen individuals vaccinated previously were enrolled in the study. They had once developed a protective level of anti-HBs antibody after immunization and their anti-HBs titer had declined to an underprotective level. Twenty uninfected and unvaccinated healthy people were chosen as controls. Lymphoproliferative response to in-vitro stimulation with hepatitis B surface antigen (HBsAg) and anti-HBs response to vaccine were evaluated for immune response. Results: T lymphocytes from 4 (24%) of the study group showed lymphoproliferative response to HBsAg stimulation while none of the controls did (P < 0.05). In all subjects in the study group, anti-HBs response (?10 mIU/ml) was detected 1 to 7 days after the booster injection but in only 2 of the controls antibody response was detected 28 days after the first dose of HBV vaccine (P < 0.0001). Conclusions: A booster dose of HBV vaccine might not be required because of immunological memory.Aim: Studies have shown that no booster dose was required at least 10 to 15 years after a primary vaccination for individuals who developed protective anti-hepatitis B surface (anti-HBs) antibodies. In this study, booster dose requirement for HBV after primary immunization was investigated. Materials and Methods: Seventeen individuals vaccinated previously were enrolled in the study. They had once developed a protective level of anti-HBs antibody after immunization and their anti-HBs titer had declined to an underprotective level. Twenty uninfected and unvaccinated healthy people were chosen as controls. Lymphoproliferative response to in-vitro stimulation with hepatitis B surface antigen (HBsAg) and anti-HBs response to vaccine were evaluated for immune response. Results: T lymphocytes from 4 (24%) of the study group showed lymphoproliferative response to HBsAg stimulation while none of the controls did (P &lt; 0.05). In all subjects in the study group, anti-HBs response (&amp;#8805;10 mIU/ml) was detected 1 to 7 days after the booster injection but in only 2 of the controls antibody response was detected 28 days after the first dose of HBV vaccine (P &lt; 0.0001). Conclusions: A booster dose of HBV vaccine might not be required because of immunological memory