PRESENT STATUS ,FUTURE PROSPECTIVE OF EFFECTIVENESS OF NUCLEAR MEDICINE IN INDONESIA

Yusuf,Sastradipradja, D.,Masjhur, John S.,Suwarno, Rochjat A.,Suhadi, F. 대한핵의학회 1984 핵의학 분자영상 Vol.18 No.1

A Multi-Indexes Based Technique for Resolving Collision in a Hash Table

Yusuf, Ahmed Dalhatu,Abdullahi, Saleh,Boukar, Moussa Mahamat,Yusuf, Salisu Ibrahim International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.9

The rapid development of various applications in networking system, business, medical, education, and other domains that use basic data access operations such as insert, edit, delete and search makes data structure venerable and crucial in providing an efficient method for day to day operations of those numerous applications. One of the major problems of those applications is achieving constant time to search a key from a collection. A number of different methods which attempt to achieve that have been discovered by researchers over the years with different performance behaviors. This work evaluated these methods, and found out that almost all the existing methods have non-constant time for adding and searching a key. In this work, we designed a multi-indexes hashing algorithm that handles a collision in a hash table T efficiently and achieved constant time O(1) for searching and adding a key. Our method employed two-level of hashing which uses pattern extraction h₁(key) and h₂(key). The second hash function h₂(key) is use for handling collision in T. Here, we eliminated the wasted slots in the search space T which is another problem associated with the existing methods.

Free vibration analysis of laminated composite beam under room and high temperatures

Yusuf Cunedioglu,Bertan Beylergil 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.51 No.1

The aim of this study is to investigate the effects of the beam aspect ratio(L/h), hole diameter,hole location and stacking layer sequence ([0/45/-45/90]s, [45/0/-45/90]s and [90/45/-45/0]s) on naturalfrequencies of glass/epoxy perforated beams under room and high (40, 60, 80, and 100°C) temperatures forthe common clamped-free boundary conditions (cantilever beam). The first three out of plane bending freevibration of symmetric laminated beams is studied by Timoshenko’s first order shear deformation theory. For the numerical analyses, ANSYS 13.0 software package is utilized. The results show that the holediameter, stacking layer sequence and hole location have important effect especially on the second and thirdmode natural frequency values for the short beams and the high temperatures affects the natural frequencyvalues significantly. The results are presented in tabular and graphical form.

Free vibration analysis of edge cracked symmetric functionally graded sandwich beams

Yusuf Cunedioglu 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.56 No.6

In this study, free vibration analysis of an edge cracked multilayered symmetric sandwich beams made of functionally graded materials are investigated. Modelling of the cracked structure is based on the linear elastic fracture mechanics theory. Material properties of the functionally graded beams change in the thickness direction according to the power and exponential laws. To represent functionally graded symmetric sandwich beams more realistic, fifty layered beam is considered. Composition of each layer is different although each layer is isotropic and homogeneous. The considered problem is carried out within the Timoshenko first order shear deformation beam theory by using finite element method. A MATLAB code developed to calculate natural frequencies for clamped and simply supported conditions. The obtained results are compared with published studies and excellent agreement is observed. In the study, the effects of crack location, depth of the crack, power law index and slenderness ratio on the natural frequencies are investigated.

Free vibration analysis of damaged composite beams

Yusuf Cunedioglu,Bertan Beylergil 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.55 No.1

In this study, free vibration analyses of symmetric laminated cantilever and simply supported damaged composite beams are investigated by using finite element method (FEM). Free vibration responses of damaged beams are examined using Euler Bernoulli beam and classical lamination theories. A computer code is developed by using MATLAB software to determine the natural frequencies of a damaged beam. The local damage zone is assumed to be on the surface lamina of the beam by broken fibers after impact. The damaged zone is modeled as a unidirectional discontinuous lamina with 0o orientations in this study. Fiber volume fraction (vf), fiber aspect ratio (Lf/df), damage length (LD) and its location (λ/L), fiber orientation and stacking sequence parameters effects on natural frequencies are investigated. These parameters are affected the natural frequency values significantly.

Corrosion and Wear Behaviors of Boronized AISI 316L Stainless Steel

Yusuf Kayali,Aysel Büyüksagis,Yllmaz Yalçin 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.5

In this study, the effects of a boronizing treatment on the corrosion and wear behaviors of AISI 316L austenitic stainless steel (AISI 316L) were examined. The corrosion behavior of the boronized samples was studied via electrochemical methods in a simulation body fluid (SBF) and the wear behavior was examined using the ball-on-disk wear method. It was observed that the boride layer that formed on the AISI 316L surface had a flat and smooth morphology. Furthermore, X-ray diffraction analyses show that the boride layer contained FeB, Fe2B, CrB, Cr2B, NiB, and Ni2B phases. Boride layer thickness increased with an increasing boronizing temperature and time. The boronizing treatment also increased the surface hardness of the AISI 316L. Although there was no positive effect of the coating on the corrosion resistance in the SBF medium. Furthermore, a decrease in the friction coefficient was recorded for the boronized AISI 316L. As the boronizing temperature increased, the wear rate decreased in both dry and wet mediums. As a result, the boronizing treatment contributed positively to the wear resistance by increasing the surface hardness and by decreasing the friction coefficient of the AISI 316L.

Differential transform method for free vibration analysis of a moving beam

Yusuf Yesilce 국제구조공학회 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.35 No.5

In this study, the Differential Transform Method (DTM) is employed in order to solve the governing differential equation of a moving Bernoulli-Euler beam with axial force effect and investigate its free flexural vibration characteristics. The free vibration analysis of a moving Bernoulli-Euler beam using DTM has not been investigated by any of the studies in open literature so far. At first, the terms are found directly from the analytical solution of the differential equation that describes the deformations of the cross-section according to Bernoulli-Euler beam theory. After the analytical solution, an efficient and easy mathematical technique called DTM is used to solve the differential equation of the motion. The calculated natural frequencies of the moving beams with various combinations of boundary conditions using DTM are tabulated in several tables and are compared with the results of the analytical solution where a very good agreement is observed.

Telmisartan to prevent recurrent stroke and cardiovascular events.

Yusuf, Salim,Diener, Hans-Christoph,Sacco, Ralph L,Cotton, Daniel,Ounpuu, Stephanie,Lawton, William A,Palesch, Yuko,Martin, Reneé,H,Albers, Gregory W,Bath, Philip,Bornstein, Natan,Chan, Bernard Massachusetts Medical Society 2008 The New England journal of medicine Vol.359 No.12

<P>BACKGROUND: Prolonged lowering of blood pressure after a stroke reduces the risk of recurrent stroke. In addition, inhibition of the renin-angiotensin system in high-risk patients reduces the rate of subsequent cardiovascular events, including stroke. However, the effect of lowering of blood pressure with a renin-angiotensin system inhibitor soon after a stroke has not been clearly established. We evaluated the effects of therapy with an angiotensin-receptor blocker, telmisartan, initiated early after a stroke. METHODS: In a multicenter trial involving 20,332 patients who recently had an ischemic stroke, we randomly assigned 10,146 to receive telmisartan (80 mg daily) and 10,186 to receive placebo. The primary outcome was recurrent stroke. Secondary outcomes were major cardiovascular events (death from cardiovascular causes, recurrent stroke, myocardial infarction, or new or worsening heart failure) and new-onset diabetes. RESULTS: The median interval from stroke to randomization was 15 days. During a mean follow-up of 2.5 years, the mean blood pressure was 3.8/2.0 mm Hg lower in the telmisartan group than in the placebo group. A total of 880 patients (8.7%) in the telmisartan group and 934 patients (9.2%) in the placebo group had a subsequent stroke (hazard ratio in the telmisartan group, 0.95; 95% confidence interval [CI], 0.86 to 1.04; P=0.23). Major cardiovascular events occurred in 1367 patients (13.5%) in the telmisartan group and 1463 patients (14.4%) in the placebo group (hazard ratio, 0.94; 95% CI, 0.87 to 1.01; P=0.11). New-onset diabetes occurred in 1.7% of the telmisartan group and 2.1% of the placebo group (hazard ratio, 0.82; 95% CI, 0.65 to 1.04; P=0.10). CONCLUSIONS: Therapy with telmisartan initiated soon after an ischemic stroke and continued for 2.5 years did not significantly lower the rate of recurrent stroke, major cardiovascular events, or diabetes. (ClinicalTrials.gov number, NCT00153062.)</P>

Analysis of trusses by total potential optimization method coupled with harmony search

Yusuf Cengiz Toklu,Gebrail Bekdaşa,Rasim Temur 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.45 No.2

Current methods of analysis of trusses depend on matrix formulations based on equilibrium equations which are in fact derived from energy principles, and compatibility conditions. Recently it has been shown that the minimum energy principle, by itself, in its pure and unmodified form, can well be exploited to analyze structures when coupled with an optimization algorithm, specifically with a meta-heuristic algorithm. The resulting technique that can be called Total Potential Optimization using Meta-heuristic Algorithms (TPO/MA) has already been applied to analyses of linear and nonlinear plane trusses successfully as coupled with simulated annealing and local search algorithms. In this study the technique is applied to both 2-dimensional and 3-dimensional trusses emphasizing robustness, reliability and accuracy. The trials have shown that the technique is robust in two senses: all runs result in answers, and all answers are acceptable as to the reliability and accuracy within the prescribed limits. It has also been shown that Harmony Search presents itself as an appropriate algorithm for the purpose.

Effect of Hempseed (Cannabis sativa sp.) Inclusion to the Diet on Performance, Carcass and Antioxidative Activity in Japanese Quail (Coturnix coturnix japonica)

Yusuf Konca,Behzat Cimen,Hasan Yalcin,Mahmut Kaliber,Selma Buyukkilic Beyzi 한국축산식품학회 2014 한국축산식품학회지 Vol.34 No.2

This study was conducted to determine the effects of hempseed (H) on performance, carcass traits, and antioxidant activity in Japanese quail (Coturnix coturnix japonica). A total of 192 quail with seven-days old were divided into four experimental groups with four replicates. The treatments were; i) Control diet (C, no hempseed); ii) 5% hempseed in diet (H5); iii) 10% hempseed in diet (H10); and iv) 20% hempseed in diet (H20). The body weight (BW) and feed intake (FI) of quail wasdetermined at 7, 21 and 42 d of age. At 42 d of age four quail were slaughtered and the carcass and internal organ traits weredetermined. Malondialdehyde (MDA), catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), nit-ric oxide (NO) and total protein were determined in the blood serum end of the experiment. The BW of the groups were notsignificant at 7 and 21 d, however in the 20% hempseed group BW decreased at 42 d (p<0.05). The FI and feed conversionratio were not significant among the treatment groups. The carcass, liver, intestine and heart weight and their percentage tocarcass were significantly differ in treatment groups (p<0.05). The serum MDA and NO decreased in hempseed addition (p<0.001). The serum SOD, CAT and GSH-Px were increased by hempseed supplementation (p<0.001). In conclusion, hemp-seed supplementation to quail diets may not improve quail performance traits but increase antioxidant activity in blood.