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Unusual Malignant Solid Neoplasms of the Kidney: Cross-Sectional Imaging Findings
Ali Devrim Karaosmanog˘lu,Mehmet Ruhi Onur,Ali Shirkhoda,Mustafa Ozmen,Peter F. Hahn 대한영상의학회 2015 Korean Journal of Radiology Vol.16 No.4
Malignant kidney neoplasms are the most frequently encountered solid kidney masses. Although renal cell carcinoma is the major renal malignancy, other solid malignant renal masses should be considered in the differential diagnosis of solid renal masses that do not contain a macroscopic fatty component. In this pictorial essay, we present the imaging findings of a primitive neuroectodermal tumor, primary liposarcoma of the kidney, primary neuroendocrine tumor, leiomyosarcoma, synovial sarcoma, malignant fibrous histiocytoma, sclerosing fibrosarcoma and renal metastasis of osteosarcoma.
A Performance Modeling of Wireless Sensor Networks as a Queueing Network with On and Off Servers
Ali, Mustafa K. Mehmet,Gu, Hao The Korea Institute of Information and Commucation 2009 Journal of communications and networks Vol.11 No.4
In this work, we consider performance modeling of a wireless sensor network with a time division multiple access (TDMA) media access protocol with slot reuse. It is assumed that all the nodes are peers of each other and they have two modes of operation, active and sleep modes. We model the sensor network as a Jackson network with unreliable nodes with on and off states. Active and sleep modes of sensor nodes are modeled with on and off states of unreliable nodes. We determine the joint distribution of the sensor node queue lengths in the network. From this result, we derive the probability distribution of the number of active nodes and blocking probability of node activation. Then, we present the mean packet delay, average sleep period of a node and the network throughput. We present numerical results as well as simulation results to verify the analysis. Finally, we discuss how the derived results may be used in the design of sensor networks.
REGULARITY OF THE GENERALIZED CENTROID OF SEMI-PRIME GAMMA RINGS
Ali Ozturk, Mehmet,Jun, Young-Bae Korean Mathematical Society 2004 대한수학회논문집 Vol.19 No.2
The aim of this note is to study properties of the generalized centroid of the semi-prime gamma rings. Main results are the following theorems: (1) Let M be a semi-prime $\Gamma$-ring and Q a quotient $\Gamma$-ring of M. If W is a non-zero submodule of the right (left) M-module Q, then $W\Gamma$W $\neq 0. Furthermore Q is a semi-prime $\Gamma$-ring. (2) Let M be a semi-prime $\Gamma$-ring and $C_{{Gamma}$ the generalized centroid of M. Then $C_{\Gamma}$ is a regular $\Gamma$-ring. (3) Let M be a semi-prime $\Gamma$-ring and $C_{\gamma}$ the extended centroid of M. If $C_{\gamma}$ is a $\Gamma$-field, then the $\Gamma$-ring M is a prime $\Gamma$-ring.
Mehmet Ali Ozturk,Ebubekir Inan 원광대학교 기초자연과학연구소 2019 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.17 No.2
In this paper, we consider the problem of how to establish algebraic structures on nearness approximation spaces. Essentially, our approach is to define the nearness ring, nearness ideal and nearness ring of all weak cosets by considering new operations on the set of all weak cosets. Afterwards, our aim is to study homomorphism on nearness approximation spaces, and to investigate some properties of nearness rings and ideals.
Semiring on weak nearness approximation spaces
Mehmet Ali Ozturk 원광대학교 기초자연과학연구소 2018 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.15 No.3
In this paper, our aim is to define the nearness semirings and to deal with their basic properties. Afterwards, we will study some properties of nearness semirings and ideals.
Laparoscopic surgery for low, intermediate and high-risk endometrial cancer
Mehmet Ali Vardar,Umran Kucukgoz Gulec,Ahmet Baris Guzel,Derya Gumurdulu,Ghanim Khatib,GulsahSeydaoglu 대한부인종양학회 2019 Journal of Gynecologic Oncology Vol.30 No.2
Objective: The aim of the present study was to compare the long-term outcomes of the laparotomy (LT) and laparoscopic surgery and to evaluate the results according to low, intermediate, and high-risk groups of endometrial cancer (EC). Methods: We identified 801 patients with EC and these patients were classified as group 1, who underwent LT (n=515); and group 2, who underwent laparoscopy (LS) (n=286). Patient's demographics, clinical characteristics such as stage, grade, histopathologic type, lymphovascular space invasion, myometrial invasion, lymph node involvement, and risk groups, peri- and post-operative outcomes, and survival outcomes were compared between the groups according to risk classification. Survival outcomes were assessed using KaplanMeier method. Results: The demographic characteristics of both groups were similar except age. Shorter hospital stay and fewer complications were observed in group 2. The overall survival (OS) were similar in the low, low-intermediate, high-intermediate and high-risk groups (p=0.269, 0.476, 0.078, and 0.085; respectively) for LS compared to LT. The covariate analysis revealed that the death and recurrence risks were approximately twice higher in the LT group than in the LS group (odds ratio [OR]=1.9; 95% confidence interval [CI]=1.2–3.1 for OS; OR=2.0; 95% CI=1.2–3.3 for disease-free survival). Conclusion: The results of our study support the well-known positive aspects of LS as well as safe and effective use in cases of intermediate and high-risk EC.
Mehmet Ali Gurol 한국데이타베이스학회 2011 Journal of information technology applications & m Vol.18 No.3
The weakening of the traditional cultures is becoming more evident from the final quarter of the last century, a period of time where the world starts to look like a "gsmall village" in all means. A substantial cause of cultural deterioration shows to be the growing use of information and communication technologies widening the views, mentalities, and perspectives of people. Today the adolescent groups frequently owning, utilizing and consequently being charmed by the electronic equipment such like computers, internet and cellular phones have developed a unique tradition/practice in sensing and meaning life triggering larger generation gap and fading of established cultures. The main focusing of the paper is on the correlation between computer and internet use and life satisfaction, level of hope, personal development assessments and expectations of the adolescent groups in Turkey. Interpretation of the survey findings indicates that this group grading highest in use of that shows to be the happiest, most hopeful and optimistic ones among other groups. Methodologically, the study is based on data analysis and a review of recent key literature. For more dependable results a further study comparing similar tendencies of the similar groups of other nationalities is recommended.
Mehmet Ali Kurcer,Zehra Kurcer,Mete Koksal,Fusun Baba,Ali Rıza Ocak,Nurten Aksoy,Ahmet Atessahin,Engin Sahna 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.4
Lycopene is one of the major carotenoids and is found almost exclusively in tomatoes and tomato products. This study was performed to evaluate the effect of lycopene on methanol-induced liver injury and to compare the results with those after fomepizole, which is used in treatment of methanol intoxication. Experiments were carried out with 30 female Wistar rats weighting 180–200g. Rats were injected with a intraperitoneally dose of 3g/kg methanol as a 50% solution in isotonic saline once for intoxication. Rats were pretreated with fomepizole (50mg/kg) and/or lycopene (10mg/kg) before methanol. After 24 hours all the drug-treated and intoxicated rats were sacrificed under anesthesia. Malondialdehyde (MDA) levels were determined in order to assess lipid peroxidation, and caspase-3 activity was determined by immunostaining of liver tissues to evaluate apoptosis. Methanol administration significantly increased the MDA level and caspase-3 activity in liver. Pretreatment with lycopene and/or fomepizole decreased the MDA levels significantly. Similarly, lycopene and fomepizole decreased methanol-induced caspase-3 activity. The findings of the present study demonstrate that methanol intoxication causes hepatic toxicity in rats and that this is likely a result of reactive oxygen species and apoptosis induction. Lycopene has protective effects against methanol-induced hepatic injury similar to fomepizole. It was demonstrated for the first time that both lycopene and fomepizole prevent methanol-induced hepatic injury by reducing the increase of lipid oxidation and caspase-3 activation.