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Fuzzy Risk Analysis Using Fuzzy Sampling Method
Saman Siadati,Mohammad Jafar Tarokh,Rassoul Noorossana 대한산업공학회 2017 Industrial Engineeering & Management Systems Vol.16 No.4
First step of reconfigurable supply chain network developing is understanding of risk affects. Categorizing of risk module and results of risk events considered with gathering and analyzing of data from network design parameters. These obtained data have probability distribution that shows uncertainty in parameters. In the literatures supply chain risk categorized based on occurrences rate or frequency and period or duration time and also place of occurrence. Deal with uncertainty and complexity of risk, our proposed fuzzy method can solve these problems in two aspects. Also described a fuzzy based sampling method (FLHS) that developed and used in this paper can improve our results even more than previous works. This paper suggests a novel modelling and simulation method of fuzzy sampling and fuzzy analysis system to address the dynamic risks effects in the especially the consideration of uncertainty risk event system behavior in different operational conditions.
Improving Sampling Using Fuzzy LHS in Healthcare Supply Chain
Saman Siadati,Mohammad Jafar Tarokh,Rassoul Noorossana 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.2
Considering the effects of risk on supply chain in healthcare industry, we must provide a mathematical model based on the risk to re-design the supply chain network, which is a part of the optimization module, random sampling meth-ods use. One of the objectives for applying sampling methods is to determine the best method (by reducing the vari-ance and computational time) for different sizes. The large number of random parameters of the objective function value led to very high variance that required using methods for reducing the variance. In this research, our approach to handle risk analysis problems in mean approximation is using traditional sampling method namely Latin hypercube sampling. However, to reduce error in correlations between variables, it is proposed to perform a fuzzy method on the intervals to eliminate uncertainty in statistical values. Limitations in hypercube sampling will be discussed and numerical results involving a FLHS are presented and compared with Monte Carlo, simple LHS and other types of LHS. We show that the proposed method can affect the precision of mean and variance values.
Characterization of Demethylated Industrial Hardwood Kraft Lignin
( Saman Ghahri ),( Byung-dae Park ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
In this research, characterization of demethylated industrial hardwood kraft lignin by FTIR were investigated. For this aim, lignin was extracted from industrial hardwood black liquor and then demethylated. The results of FTIR clearly showed that methoxyl groups in lignin structure were decreased after demethylation.
Samane Sakaki,Ahad Sahragard 한국응용곤충학회 2011 Journal of Asia-Pacific Entomology Vol.14 No.4
Functional response is basic to any investigation of predator–prey relationships. In this study, the functional response of female Scymnus syriacus Marseul (Col.: Coccinellidae) to different densities (10, 20, 40, 60, 80,100) of third instar nymphs of Aphis gossypii Glover as prey was studied in an open patch experiment in a growth chamber (25 °C, 65±5% RH and a photoperiod of 16L:8D h ). Using logistic regression, a type II functional response for female Scymnus syriacus was determined. The searching efficiency (a') and handling time (T_h) of the female predator using non linear least-square regression were estimated as 0.0769±0.0136 h^(−1) and 0.3103±0.0438 h., respectively. Mean times required for the female predator to settle in a patch were 10.20±4.28, 6.58±2.58, 12.58±4.50, 4.53±1.48, 5.14±2.59, 3.87±3.52 min at different prey densities, respectively. Maximum theoretical predation rate (T/T_h) estimated by Rogers' model for the female predator was 77.34. The proportion of female predators remaining in open patches at the end of the experiment was dependent on prey density (R^2=0.876). The type of functional response obtained here agrees with studies on this predator in closed patches.
Saman Bagheri,Ali Nikkar 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
This paper deals with the determination of approximate solutions for a model of column buckling using two efficient and powerfulmethods called He’s variational approach and variational iteration algorithm-II. These methods are used to find analytical approximatesolution of nonlinear dynamic equation of a model for the column buckling. First and second order approximate solutions of the equationof the system are achieved. To validate the solutions, the analytical results have been compared with those resulted from Runge-Kutta 4thorder method. A good agreement of the approximate frequencies and periodic solutions with the numerical results and the exact solutionshows that the present methods can be easily extended to other nonlinear oscillation problems in engineering. The accuracy and convenienceof the proposed methods are also revealed in comparisons with the other solution techniques.
Samane Adib,Taki Tiraihi,Merzieh Darvishi,Taher Taheri,Hadi Kazemi 한국조직공학과 재생의학회 2015 조직공학과 재생의학 Vol.12 No.1
Human Bone marrow stromal cells (hBMSCs) can differentiate under appropriate experimental conditionsinto neuronal and glial-like cells. This study shows a protocol for producing human neural stem cells (hNSCs)from hBMSCs and the subsequent differentiation of hNSCs into cholinergic neurons (CNs), where sequential mediareplaced the culturing media. hBMSCs have been used in generating cell aggregates (CAs) using bFGF, EGF andB27. The hNSCs were isolated from CAs, and the CNs differentiated from the hNSCs using sequential media, wherebFGF, EGF and B27 were gradually replaced with NGF. The hNSC stemness was checked by RT-PCR of SOX2,Oct-4 and Nanog genes. Fibronectin, CD90, CD106, CD31, nestin, neurofilament 68 (NF-68), NF-200 and ChATimmunostaining evaluated the differentiation of the hBMSCs, the hNSCs and the CNs. FM1-43 was used in studyingthe function of the CNs. The hBMSCs were immunoreactive to fibronectin, CD90 and CD106; they werechecked for lipogenic and osteogenic differentiation. The cells of the CAs were immunoreactive to nestin. ThehNSCs were immunoreactive to nestin and NF-68, also, they expressed SOX2, Oct-4 and nanong. Nestin expressiondeclined sharply following NSC differentiation into CNs, while the expression of NF-200, synapsin I, synaptophysin,MAP-2 and ChAT increased. They were stained with FM1-43, where the synaptic vesicles were releasedfollowing stimulation. The present study demonstrates the conversion of hBMSCs into CASs under appropriate conditions. CAs generated hNSCs, which were induced in order to differentiate into CNs using sequential media, wherethe yield was 83%.
An Investigation on Image Secret Sharing
Saman Salehi,Mohammad Ali Balafar 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.3
Numerous multimedia applications and communications are rapidly growing through the Internet. Because most of these multimedia communications are confidential and cannot be known by unauthorized users, secret image sharing has become a key technology for digital images in secured storage and confidential transmission. The ultimate objectives of secret sharing include transparency, authority (resistance to various image tampering and forgery methods), and high capacity of the hidden data. A variety of secret image sharing algorithms and techniques have been proposed in order to satisfy these objectives. These goals were used in this paper to compare current methods of image secret sharing and present their properties and limitations. This paper provided a state-of-the-art review and analysis of different existing secret image sharing methods along with some common standards and guidelines drawn from the literature.
Samane Arefani,Seyyed Mohammad Mohseni Mehran,Hassan Moladoust,Mohammad Reza Norasfard,Ahmad Ghorbani,Mahmood Abedinzade 대한약침학회 2018 Journal of pharmacopuncture Vol.21 No.2
Objective: Diseases of the respiratory system are one of the main causes of death and include situation such as chronic obstructive pulmonary disease, pneumonia or asthma. Medicinal plants have beneficial effects on multiple diseases include respiratory disorders like asthma and bronchitis. The aim of this study was to evaluate the effects of U. dioica and L. Album on tracheal smooth muscle contraction. Material and methods: Hydroalcoholic extracts of L. Album and U. Dioica aerial parts were prepared by maceration method and standardized based on their total phenol content. The effect of the extracts on the KCl-induced contraction of rat trachea was examined in an organ bath chamber. Data was analyzed with spss software 22. Results: The extract of L. Album (5 mg/ml), similar to theophylline (20 mM), significantly reduced the KCl-induced tracheal contraction. On the other hand, U. Dioica (1 mg/ml and 5 mg/ml) augmented the KCl-induced contraction. Conclusion: The relaxant effect of L. Album on the trachea makes it as a candidate for the managing patients with asthma and obstructive pulmonary diseases. But because of U. Dioica potential constrictive effect on the trachea it is suggested that patients avoid consuming it.