Binary BAT algorithm and RBFN based hybrid credit scoring model

Credit scoring is a process of calculating the risk associated with an applicant on the basis of applicant’s credentials such as social status, financial status, etc. and it plays a vital role to improve cash flow for financial industry. However, the credit scoring dataset may have a large number of irrelevant or redundant features which leads to poorer classification performances and higher complexity. So, by removing redundant and irrelevant features may overcome the problem with huge number of features. This work emphasized on the role of feature selection and proposed a hybrid model by combining feature selection by utilizing Binary BAT optimization technique with a novel fitness function and aggregated with for Radial Basis Function Neural Network (RBFN) for credit score classification. Further, proposed feature selection approach is aggregated with Support Vector Machine (SVM) & Random Forest (RF), and other optimization approaches namely: Hybrid Particle Swarm Optimization and Gravitational Search Algorithm (PSOGSA), Hybrid Particle Swarm Optimization and Genetic Algorithm (PSOGA), Improved Krill Herd (IKH), Improved Cuckoo Search (ICS), Firefly Algorithm (FF) and Differential Evolution (DE) are also applied for comparative analysis.

     

Nanopillars TiO<Subscript>2</Subscript> thin film photocatalyst application in the remediation of aquatic environment

We assessed the photocatalytic behavior of Nanopillars-TiO₂ thin films obtained onto a borosilicate glass in the degradation of 17α-ethynylestradiol (EE2) from aqueous solution under batch reactor operations. The thin films were characterized by the XRD, SEM, AFM analytical methods. BET specific surface area and pore sizes were also obtained. The photocatalytic degradation of EE2 using the UV light was studied at wide range of physico-chemical parametric studies to determine the mechanism of degradation as well the practical implacability of the technique. The batch reactor operations were conducted at varied pH (pH 4.0 to 10.0), EE2 initial concentration (1.0 to 5.0mg/L) and presence of several interfering ions, i.e., cadmium nitrate, copper sulfate, zinc chloride, sodium chloride, sodium nitrate, sodium nitrite, glycine, oxalic acid and EDTA in the photocatalytic degradation of EE2. The time dependence photocatalytic degradation of EE2 was demonstrated with the pseudo-first-order rate kinetics. The mineralization of EE2 was assessed using the total organic carbon analysis conducted at varied initial pH and EE2 concentrations. Further, the repeated use of the photocatalyst enhanced the applicability of thin films in the successive photocatalytic operations.     

Synchronous steady state response of an overhung rotor with squeeze film damping

An analytical method is developed for treatment of a typical system in which the outrigger bearing of an overhung rotor is provided with a squeeze film damper supported in a flexible casing. The rotor and stator of multiple degrees-of-freedom are handled with convenience by a “polar receptance matrix” method. A characteristic equation is derived which governs rotor-stator interaction either with dry contact or through a squeeze film damper. For the nonlinear squeeze film action solutions based on “mobility” information of a dynamically loaded journal bearing are obtained facilitating a general approach. A computer programme is written in Fortran for steady state response of the system in terms of whirl, position and force vectors, trial runs of which indicate complex behaviour of a squeeze film damped system.     

2'-脱氧核糖胞苷的合成工艺

本文报道了2''-脱氧核糖胞苷的一条工业化生产的路线。该工艺路线以α-D-2-脱氧核糖和尿嘧啶为原料,经过甲苷化,酯化,氯代,亲核取代,高效氨化及水解脱保护等6个步骤,总收率44%,经一次重结晶纯化最终产品纯度达到99%以上。此路线条件温和,操作安全,终产物分离纯化简易。目前已经完成公斤级别的中试。     

Oscillatory flow in a stratified medium past an infinite porous plate with constant suction

An approximate solution to oscillatory flow past a porous horizontal plate was carried out under the following conditions

• (i) Constant suction
• (ii) Stratification of the medium due to change in density, viscosity and thermal conductivity
• (iii) Free-stream oscillation about a nonzero constant mean.

Solutions have been derived for the transient velocity, the transient temperature, the amplitude and the phase of skin friction and the amplitude and phase of the first and second harmonics of the rate of heat transfer. These are shown on the graphs. The effects of the suction parameter S, the stratification parameter λ, the frequency λ and the Eckert number E are discussed.     

Modulation of serratiopeptidase transdermal patch by lipid-based transfersomes

Serratiopeptidase is a proteolytic enzyme obtained from serratia marcescens strain E-15 and used as anti-inflammatory and analgesic drug. Serratiopeptidase undergoes first pass metabolism, causes the gastrointestinal disturbance and systemic toxicity after oral administration. To overcome the limitations of serratiopeptidase, transdermal drug delivery system is an alternative method. So, the aim of present work was to modulate serratiopeptidase transdermal patch by lipid-based transfersomes. Particle size of drug was the major concern to cross stratum corneum which acts as a barrier. This difficulty was surmounted by modulating the vesicles such as transfersomes which carries the drug into the skin by passing the barrier of stratum corneum. Serratiopeptidase was encapsulated in transfersomes in different ratios of lecithin and cholesterol. Particle size of transfersomes, folding endurance, thickness, tensile strength, adhesion test, encapsulation efficiency, in vitro and in vivo release, Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimeter (DSC) studies of patch were used as characterization parameters. Serratiopeptidase transfersomes size was found to be 50 µm with smooth surface. The promising entrapment efficiencies of transfersomes and formulation were found to be 96.76 and 98.7%, respectively. In vitro and in vivo release studies showed controlled and steady release of serratiopeptidase for 24 h. FTIR and DSC confirmed the encapsulation of drug in patch without interaction. It is concluded that transfersomes are interesting carriers for enzymatic drugs for topical application.     

振荡热管的热阻变化规律及烧干特性

振荡热管作为高效传热元件,在解决微小空间而热通量较高的元器件散热方面具有独特的优势。虽然振荡热管结构简单,但其内部运行规律多变复杂,目前还处于探索研究阶段。通过对实验结果的分析,得到随加热功率和充液率改变振荡热管的热阻变化规律,探讨了不同工况所对应的传热机理;同时还对振荡热管的烧干特性进行了分析和研究。所做工作为建立振荡热管理论模型、认识其传热规律提供参考。     

Machine Sharing in Manufacturing Systems: Total Flexibility versus Chaining

In this paper, we compare the operational performance of two machine-sharing configurations: total flexibility and chaining. We show that chaining captures most of the benefits of total flexibility while limiting the number of part types processed on any individual machine to only two. We examine the relative desirability of the two configurations under varying buffer sizes, loading conditions, number of machines, and setup times, as well as for different control policies. For nonzero setups times, we show that chained configurations can outperform fully flexible ones. This particularly is the case when either the number of machines or length of setup times is high. We also find that the effect of the system size on performance diminishes with the number of machines. This means that multiple smaller chains can perform almost as well as a single long one. Our results are consistent with the recent findings of Jordan and Graves (1995), who examined the economic benefits of chaining relative to full flexibility.     

Aflatoxin B(1) contamination of parboiled rice samples collected from different states of India: A multi-centre study.

Under a multi-centre study conducted by the Indian Council of Medical Research, 1,511 samples of parboiled rice were collected from rural and urban areas of 11 states representing different geographical regions of India. These samples were analysed for contamination with aflatoxin B(1.) The presence of aflatoxin B(1) at levels=5 microg g(-1) was found in 38.5% of the total number of samples of the parboiled rice. About 17% of the total samples showed the presence of aflatoxin B(1) above the Indian regulatory limit of 30 microg kg(-1). No statistically significant difference in percentage of samples contaminated with >30 microg kg(-1) was observed between pooled rural (19.4%) and urban (14.5%) data. A median value of 15 microg kg(-1) of aflatoxin B(1) was observed in samples from Assam, Bihar and Tripura. In all other states surveyed the median value was <5 microg?kg(-1).     

Strategic inventory deployment in the steel industry

Integrated Steel Manufacturers (ISMs) perform all of the steps necessary to convert iron ore into finished products. As a result they are characterized by high capital expenditures and long cycle times. The custom nature of finished products and significant demand uncertainty explains why ISMs typically produce to order. However, recent increased competition from low cost mini-mills is causing some ISMs to compete by serving the needs of higher-paying customers who want exotic products, and faster and reliable deliveries. Consequently, ISMs are exploring the option of satisfying a portion of their demand by converting strategically placed semi-finished inventory into finished products, which helps to reduce both the time between order receipt and order dispatch, and its variability. In this study we propose a two-stage stochastic integer programming model that can be used to choose the semi-finished products that should be made to stock, and their target inventory levels. Properties of this model are exploited to develop a fast heuristic applicable to large-scale instances of the problem encountered in industry. Numerical experiments are used to validate the heuristic, and examples based on data from a particular ISM are used to illustrate important managerial insights.