33 research outputs found
Anonymous RFID authentication for cloud services
Cloud computing is one of the fastest growing segments of IT industry since the users’ commitments for investment and operations are minimized, and costs are in direct relation to usage and demand. In general, cloud services are required to authenticate the user and most of the practical cloud services do not provide anonymity of the users. Namely, cloud provider can track the users easily, so privacy and authenticity are two critical aspects of security. Anonymous authentication is a technique enabling users to prove that they have privilege without disclosing real identities. This type of authentication can be useful especially in scenarios where it is sufficient to ensure the server that the claiming parties are indeed registered. Some motivating applications in the cloud for an anonymous authentication protocol are E-commerce, E-voting, E-library, Ecashand mobile agent applications. Many existing anonymous authentication protocols assume absolute trust to the cloud provider in which all private keys are stored. This trust may result in serious security and privacy issues in case of private key leakage from the cloud provider. In this paper, we propose forward secure anonymous and mutual authentication protocols using RFID technology for cloud services. These protocols avoid the trustworthiness to the cloud provider. Meaning that, even if the private keys are obtained from the corrupted tags or from the server owners of these tags cannot be traced from the past authentication actions. In fact, anonymity of the users will still be ensured even the private keys of tags are compromised
The effect of short-term royal jelly supplement on testosterone levels in sedentary and healthy individuals
This study with a placebo-controlled experimental design intends to investigate the effect of shortterm Royal Jelly (RJ) on the testosterone levels in sedentary men at a dose of 1000 mg/day. For this purpose, a total of 20 adult sedentary men aged 21 to 23 were included in this study. The subjects visited the laboratory every day for 15 days between 08:00 and 10:00 to get their portion of royal jelly. The subjects were randomly divided into two groups, namely the experimental group (n = 10 individuals, 1000 mg/day of Royal Jelly) and the placebo group (n = 10 individuals, corn starch mixed with 1000 mg/day of water) and they took royal jelly in glass vials at the same time. Blood samples were taken from both groups of subjects one day before and one day after the study and analyzed to determine their testosterone levels. 2x2 mixed factor ANOVA and LSD tests were used to analyze data obtained from the experimental and the placebo group. A sharp increase in the testosterone levels of the experimental group that took RJ for a short time was found to be statistically significant (p0.05). The study shows that a short-term 1000 mg/day dose of RJ supplements was effective in increasing testosterone levels in sedentary, healthy men. © Mattioli 1885
Norwegian internet voting protocol revisited: ballot box and receipt generator are allowed to collude
The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link. open access articleNorway experienced internet voting in 2011 and 2013 for municipal and parliamentary elections, respectively. Its security depends on the assumptions that the involving organizations are completely independent, reliable, and the receipt codes are securely sent to the voters. In this paper, we point out the following aspects:
- The vote privacy of the Norwegian scheme is violated if Ballot Box and Receipt Generator cooperate because the private key of Decryption Service can be obtained by the two former players. We propose a solution to avoid this issue without adding new players.
- To assure the correctness, the receipt codes are sent to the voters over a pre‐channel (postal service) and a post‐channel (Short Message Service [SMS]). However, by holding both SMS and the postal receipt code, a voter can reveal his vote even after the elections. Albeit revoting is a fairly well solution for coercion or concealment, intentional vote revealing is still a problem. We suggest SMS only for notification of vote submission.
- In case the codes are falsely generated or the pre‐channel is not secure, a vote can be counted for a different candidate without detection. We propose a solution in which voters verify the integrity of the postal receipt codes
Comparison of muscle activation during push-ups exercise on stable and unstable surfaces
Bu çalışmada, instabilite cihazlarında ve sabit zeminde yapılan şınav egzersizi sırasında Pectoralis Majör (PM), Antreior Deltoid (AD) ve Triceps Brachii (TB) kaslarının elektromiyografik aktivasyonlarının belirlenmesi amaçlanmıştır. 18-25 yaş aralığında 25 katılımcı, sabit bir yüzey, her iki taraf da kullanılan top (BOSU), Pilates topu ve Fonksiyonel egzersiz bandı (TRX) üzerinde çapraz geçişli deney tasarımında şınav egzersizi uyguladı. Katılımcılar 2 saniye iniş, 2 saniye çıkış fazı olmak üzere 3 tekrardan oluşan şınav hareketini sırasıyla 4 zeminde uyguladı. Egzersiz sırasında PM, AD ve TB kaslarının amplitüdünü belirlemek için yüzey elektromiyografisi (sEMG) kullanıldı. sEMG genliği, kasların izometrik kasılmaları sırasında en yüksek tepe tork değerini veren maksimum istemli kasılma (MİK) yöntemi kullanılarak normalleştirildi. PM kasında TRX’te sabit zemin ve BOSU’ya göre önemli ölçüde daha yüksek normalize sEMG amplitüdü (%MİK) değerleri tespit edildi. AD kasında Pilates topunda diğer zeminlere göre önemli ölçüde daha düşük %MİK değerleri tespit edildi. TB kasında sabit yüzey ve BOSU’ya kıyasla TRX ve Pilates topunda önemli ölçüde daha yüksek %MİK değerleri tespit edilirken BOSU’da sabit zemine göre daha yüksek değerler tespit edildi. TRX’te şınav PM, AD, TB kasları için daha fazla zorluk isteyen antrenörler için iyi bir seçenek olabilirken; AD kası için şınav egzersizinde pilates topunu tercih etmek doğru olmayabilir.In this study, it was aimed to determine the electromyographic activations of Pectoralis Major (PM), Anterior Deltoid (AD), and Triceps Brachii (TB) muscles during push-up exercises performed on instability devices and a stable surface. Twenty-five participants aged 18-25 performed push-ups in an experimental crossover design on a stable surface, both sides utilized ball (BOSU), Pilates ball, and TRX Suspension Trainer (TRX). Participants completed the push-up exercise consisting of 3 repetitions, 2 seconds of descent, and 2 seconds of ascent, on four floors, respectively. Surface electromyography (sEMG) was used to determine the amplitude of the PM, AD, and TB muscles during exercise. The sEMG amplitude was normalized using the maximum voluntary contraction (MİK) method, which gives the highest peak torque value during isometric contractions of the muscles. Significantly higher normalized sEMG amplitude (%MİK) values were detected in the PM muscle compared to the stable surface and BOSU in TRX. In the AD muscle, significantly lower %MİK values were detected on the Swiss Ball compared to the other surfaces. Compared to the stable surface and BOSU in the TB muscle, significantly higher %MİK values were detected in the TRX and Swiss Ball, while higher values were detected in the BOSU than in the stable surface. While TRX can be a good option for trainers who want more challenge for the PM, AD, and TB muscles, It may not be suitable to prefer the Swiss Ball in push-up exercise for AD muscle
False negative effect of high triglycerides concentration on vitamin D levels: A big data study
Background: Inaccurate test results may be a reason why vitamin D deficiency is seen as a common problem worldwide. Interferences from the sample matrix during testing are the most important factors in measurement errors. In this study, the relationship between triglycerides and total cholesterol levels and vitamin D levels in Turkey was investigated. Methods: The 25-hydroxyvitamin D test results and lipid test results studied in Turkey in 2021 were compared. Data were obtained from the Ministry of Health National Health Database. Simultaneously, 25-hydroxyvitamin D, triglyceride, and total cholesterol levels were studied, and 1,135,644 test results were taken as the basis. Results: In the group of patients with total cholesterol levels between 0-10.33 mmol/L, the proportion of patients below 20 mg/L ranged from 56.8% to 61.8%. In the patient group with cholesterol between 10.36-259 mmol/L, the rate of patients with less than 20 mg/L was between 70.8-100%, while the rate of patients with cholesterol above 100 mg/L was 0%. The mean 25-hydroxyvitamin D level was 20.1 mg/L in the patient group with a total cholesterol level between 0-10.33 mmol/L, and 16 mg/L in the patient group with a cholesterol level above 10.36 mmol/L. The mean 25-hydroxyvitamin D level was 20.11 mg/L in the patient group with triglycerides 0-10.16 mmol/L, and the 25-hydroxyvitamin D level was 12.28 mg/L in the patient group with triglycerides 10.17-113 mmol/L. The proportion of patients with vitamin D levels above 100 mg/L was found to be 0% in the group of patients with triglycerides above 10.17-113 mmol/L. Conclusions: According to this study, there is a risk of toxicity when administering vitamin D therapy in patients with high cholesterol and triglycerides levels. This study is the first of this size in the literature. High triglycerides and cholesterol levels can cause inaccurate measurement of vitamin D levels, so care should be taken when evaluating these tests
Attitudes of religious culture and moral knowledge teachers and religious vocational high school teachers towards human nature
Bu araştırma, giriş ve sonuç kısımları hariç üç bölümden oluşmaktadır. Giriş kısmında araştırmanın problemi, amacı ve önemi üzerinde durulmuştur. Birinci bölümde insan doğası kavramına tarihsel süreç içerisinde yüklenen anlamlar, felsefi, psikolojik ve İslami bakış açıları bağlamında ele alınmıştır. İkinci bölümde araştırmanın modeli, evren ve örneklemi, veri toplama aracı ve veri toplama süreçlerinden bahsedilmiştir. Dördüncü bölümde veri toplama aracından elde edilen istatistiki bulgular, literatür kısmındaki bilgiler ışığında araştırma sorularına göre yorumlanmıştır. Bu çalışmanın amacı, Din Kültürü ve Ahlak Bilgisi öğretmenleri ve İmam Hatip Lisesi Meslek Dersleri öğretmenlerinin insan doğasına ilişkin varsayımlarını ve tutumlarını saptamak, bunları çeşitli değişkenler bağlamında analiz etmektir. Nicel bir araştırma olan bu çalışmada tarama (betimleme) modeli kullanılmıştır. Tarama modelinde gerçekleştirilen betimsel nitelikteki araştırmanın evreni, 2014-2015 eğitim-öğretim yılında Trabzon il sınırlarındaki devlet okullarında görev yapan Din Kültürü ve Ahlak Bilgisi öğretmenleri ile İmam-Hatip Lisesi Meslek Dersleri öğretmenlerinden oluşmaktadır. İnsan doğası alt boyutlarından aldıkları ortama puanlar (5,93) dikkate alındığında, katılımcıların insan doğasına ilişkin tutumlarının genelde olumlu olduğu görülmektedir. Bununla birlikte katılımcıların ölçeğin insana güven, özgecilik ve karmaşıklık boyutlarını olumsuz değerlendirdikleri tespit edilmiştir. Katılımcıların demografik özellikleriyle insan doğasına ilişkin tutumları arasındaki ilişkiye bakıldığında, medeni durumlarına göre evli öğretmenlerin insanları daha basit ve kolay anlaşılabilir olarak algıladıkları, yaş değişkenine göre 18-25 yaş grubundaki öğretmenlerin insan doğasını daha değişken olarak algıladıkları, kıdem yılına göre, tecrübeli öğrenmelerin diğer insanlara yönelik daha genellemeci bakış açısına sahip oldukları sonuçlarına ulaşılmıştır. Anahtar Kelimeler: Din eğitimi, insan, insan doğası, tutum ve inanç, Din Kültürü ve Ahlak Bilgisi Öğretmeni, İmam Hatip Liseleri Meslek Dersleri Öğretmeni. This study is composed of three chapters exclusive of introduction and conclusion sections. In the introduction, the problem, purpose and importance of the study are elaborated. The first chapter discusses meanings ascribed to the human nature in time in philosophical, psychological and Islamic perspective. In the second chapter the model, population and sample of the study are discussed, along with data collection tool and data collection processes. The fourth chapter is devoted to the interpretation of statistical findings from the data collection tool in the light of the literature teachings and based on the study queries. The purpose of this study is to determine assumptions and attitudes of Religious Culture and Moral Knowledge teachers and Religious Vocational High School teachers towards human nature, and to analyze these attitudes with several variables. This quantitative study is carried out with scanning (survey) method. The population of this descriptive study carried out using scanning method consists of Religious Culture and Moral Knowledge teachers and Religious Vocational High School teachers working in state schools in Trabzon during 2014-2015 academic year. Given the average scores (5,93) in human nature sub-dimension, it is observed that the attitude of the attendants towards the human nature is in general positive. However, it is determined that the participants gave negative results for confidence to mankind (trustworthiness), altruism and complexity. In view of the relationship between the demographical features of the participants and their attitude towards human nature, it is concluded that based on the marital status married teachers perceive humans to be simple and uncomplex creatures whereas according to age variable, the teachers at the age of 18-25 perceive human nature to be unstable, and based on the years of seniority, experienced teachers are more prone to make generalization about humans. Keywords: Religious education, human, human nature, attitude and belief, Religious Culture and Moral Knowledge teacher, Religious Vocational High School teacher
Matbuat Hatıralarım'ın karartılan talihi
Taha Toros Arşivi, Dosya No: 121-Ahmet İhsan TokgözUnutma İstanbul projesi İstanbul Kalkınma Ajansı'nın 2016 yılı "Yenilikçi ve Yaratıcı İstanbul Mali Destek Programı" kapsamında desteklenmiştir. Proje No: TR10/16/YNY/010
Ergene Havzasının Doğusunun (Halaçlı-Çayırdere-Sayalar) Hidrojeolojik İncelemesi
In the Thrace Region, there has been a population growth since 1970s due to the rapid increase in industrialization especially in Çorlu, Çerkezköy and Silivri. The need for drinkable, municipal, irrigation and industrial water has also increased significantly because of the population growth and industrialization. Groundwater abstraction from many boreholes in the region has been implemented so as to meet these (the) needs.
The study area is located in the eastern part of the Ergene Basin where there is no industrialization and the population density is low. Agricultural activities are also carried out intensively in the region. There are not many effects polluting the groundwater in the study area. For this reason, there are 28 drinking water wells by Istanbul Metropolitan Municipality in the region, and they produce average 30 I/s flow rates.
In this study, the hydrogeological characteristics of Ergene and Danişment Formations will be investigated. In order to investigate these formations with aquifer, feeding grounds and geological structural elements of the study area determined. Moreover, surface and groundwater in the area evaluated together. In the light of all data obtained in the study, it is aimed to create the conceptual model of the area by making hydrogeological evaluations.Trakya Bölgesinde, 1970’li yıllardan itibaren özellikle Çorlu, Çerkezköy ve Silivri İlçelerinde sanayileşmenin hızla artmasına bağlı olarak yoğun bir nüfus artışı yaşanmıştır. Nüfus artışı ve sanayileşme nedeniyle, içme, kullanma, sulama ve sanayii suyu gereksinimi de önemli oranda artış göstermiştir. Bölgede açılan çok sayıdaki sondaj kuyusundan ihtiyacı karşılamak amacıyla yeraltısuyu çekilmektedir.
Çalışma alanı, Ergene Havzasının doğu kesiminde bulunmakta olup, sanayileşmenin olmadığı, nüfus yoğunluğunun az olduğu ve tarımsal faaliyetlerin yoğun olarak yapıldığı bölgededir. Alanda yeraltısuyunu kirleten etkiler azdır. Bu nedenle bölgede, İstanbul Büyükşehir Belediyesi tarafından açılmış 28 adet ortalama 30 l/sn debide üretim yapan içme suyu kuyusu bulunmaktadır.
Bu çalışmada, Ergene ve Danişment Formasyonlarının hidrojeolojik özellikleri incelenmiştir. Akifer özelliği gösteren bu formayonların incelenmesi amacıyla; çalışma alanının beslenim alanları, jeolojik yapısal unsurları belirlenecek, sahada bulunan yüzey ve yeraltısuları birlikte değerlendirilmiştir. Elde edilen tüm veriler ışığında hidrojeolojik değerlendirmeler yapılarak alanın kavramsal hidrojeolojik modeli oluşturulmuştur