scholarly journals Integrated Lab-on-a-Chip Optical Biosensor Using Ultrathin Silicon Waveguide SOI MMI Device

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4955
Author(s):  
Mohamed Y. Elsayed ◽  
Sherif M. Sherif ◽  
Amina S. Aljaber ◽  
Mohamed A. Swillam
Keyword(s):  
Design Methodology ◽  
Figure Of Merit ◽  
Optical Biosensor ◽  
Glucose Sensing ◽  
Multimode Interference ◽  
Silicon Waveguide ◽  
Definition Of ◽  
Ultrathin Soi ◽  
Compact Design ◽  
Difference Time

Waveguides with sub-100 nm thickness offer a promising platform for sensors. We designed and analyzed multimode interference (MMI) devices using these ultrathin platforms for use as biosensors. To verify our design methodology, we compared the measured and simulated spectra of fabricated 220-nm-thick MMI devices. Designs of the MMI biosensors based on the sub-100 nm platforms have been optimized using finite difference time domain simulations. At a length of 4 mm, the 50-nm-thick MMI sensor provides a sensitivity of roughly 420 nm/RIU and with a figure of merit (FOM) definition of sensitivity/full-width-at-half-maximum, the FOM is 133. On the other hand, using a thickness of 70 nm results in a more compact design—only 2.4 mm length was required to achieve a similar FOM, 134, with a sensitivity of 330 nm/RIU. The limits of detection (LOD) were calculated to be 7.1 × 10−6 RIU and 8.6 × 10−6 RIU for the 50 nm and the 70-nm-thick sensor, respectively. The LOD for glucose sensing was calculated to be less than 10 mg dL−1 making it useful for detecting glucose in the diabetic range. The biosensor is also predicted to be able to detect layers of protein, such as biotin-streptavidin as thin as 1 nm. The ultrathin SOI waveguide platform is promising in biosensing applications using this simple MMI structure.

scholarly journals High Sensitivity Plasmonic Sensor Based on Fano Resonance with Inverted U-Shaped Resonator

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1164
Author(s):  
Gongli Xiao ◽  
Yanping Xu ◽  
Hongyan Yang ◽  
Zetao Ou ◽  
Jianyun Chen ◽  
...  
Keyword(s):  
Fano Resonance ◽  
Figure Of Merit ◽  
High Sensitivity ◽  
Refractive Index Sensor ◽  
Multimode Interference ◽  
Geometrical Parameters ◽  
The Finite Element Method ◽  
Plasmonic Sensor ◽  
Coupled Mode ◽  
Plasmonic Nanosensor

Herein, we propose a tunable plasmonic sensor with Fano resonators in an inverted U-shaped resonator. By manipulating the sharp asymmetric Fano resonance peaks, a high-sensitivity refractive index sensor can be realized. Using the multimode interference coupled-mode theory and the finite element method, we numerically simulate the influences of geometrical parameters on the plasmonic sensor. Optimizing the structure parameters, we can achieve a high plasmonic sensor with the maximum sensitivity for 840 nm/RIUand figure of merit for 3.9 × 105. The research results provide a reliable theoretical basis for designing high sensitivity to the next generation plasmonic nanosensor.

Multimode-Interference-Based Waveguide Crossing in Two-Dimensional Cubic Photonic Crystal

2013 ◽  
Vol 284-287 ◽  
pp. 2876-2879
Author(s):  
Yih Bin Lin ◽  
Jen Hao Cheng ◽  
Rei Shin Chen ◽  
Ting Chung Yu ◽  
Ju Feng Liu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Integrated Circuits ◽  
Expansion Method ◽  
Transmission Efficiency ◽  
Multimode Interference ◽  
Plane Wave Expansion Method ◽  
Modal Dispersion ◽  
Optical Integrated Circuits ◽  
Difference Time ◽  
Novel Design

A novel design of photonic crystal waveguide crossing based on multimode-interference (MMI) structure is proposed. Two structures of difference device lengths are simulated and studied. The proposed structures have high transmission efficiency for a wide bandwidth. The crosstalk is -26dB with device length of 12 lattice periods and -39dB with device length of 24 lattice periods. The plane wave expansion method and finite-difference time-domain method are used to calculate the modal dispersion curve and field propagation, respectively. The proposed MMI-based waveguide crossing has the potential to be practical in high-density optical integrated circuits.

The operational efficiency of passenger aircraft

2006 ◽  
Vol 78 (1) ◽  
pp. 32-38 ◽  
Author(s):  
Donald McLean
Keyword(s):  
Design Methodology ◽  
Operational Efficiency ◽  
Civil Aviation ◽  
Content Type ◽  
Transport Economics ◽  
Load Factors ◽  
Consistent Assessment ◽  
Definition Of ◽  
Passenger Aircraft ◽  
Practical Implications

PurposeTo provide for the use of airlines and other civil aviation organizations a practical definition of operational efficiency and to show how it can be determined.Design/methodology/approachA brief account of air transport economics is used to demonstrate how bom load factors and aircraft utilization need to be considered in assessing operational efficiency. Then other efficiencies are treated briefly before an example is given of how the better of two fictitious aircraft can be chosen for a particular route. A second example involving the calculation of the operational efficiency achieved by an imaginary airline is also given to show that the typical value is lower than might be expected, particularly in view of the relatively high load factors involved.FindingsProvides performance values and economic figures which are typical of current airline operations.Practical implicationsUse of the proposed definition will allow the consistent assessment of the economic performance of airlines.Originality/valueAt present there is no definition of operational efficiency in general use although it is greatly needed by airlines. The definition proposed in this paper is practical and easy to use.

A model for the elaboration of fair divisional projects in inheritance disputes

2018 ◽  
Vol 36 (2) ◽  
pp. 186-202
Author(s):  
Francesco Tajani ◽  
Pierluigi Morano
Keyword(s):  
Design Methodology ◽  
Market Value ◽  
Content Type ◽  
Mathematical Formulas ◽  
Mathematical Algorithms ◽  
Complex Inheritance ◽  
Fundamental Value ◽  
Definition Of ◽  
Calculation Software ◽  
Legal Right

Purpose The purpose of this paper is to develop a method to support the definition of efficient and fair divisional projects in particularly complex cases concerning inheritance disputes. Design/methodology/approach First, the approach involves an appraisal of the market value of the assets, along with an analysis of the respective conditions of concrete divisibility; then, two mathematical models have been developed for the assignment of the assets to the subjects involved in the divisional projects. The logic underlying of both models has been translated into mathematical algorithms that allow for the minimization of the monetary compensations resulting from the differences between the legal right shares and the actual portions to be attributed to them. Findings Both models have been developed through mathematical formulas that can be easily implemented by using an appropriate calculation software. They can be used in particularly complex inheritance divisions, in which the deceased’s assets are numerous and there are several heirs with similar or different legal right shares. Originality/value The methodology is useful in the disputes that could arise in hereditary successions. The fundamental value is that the models could support the definition of the best solution in particularly complex situations, characterized by a large number of assets to be assigned and/or the existence of “preferential” constraints for the assignment of the assets.

scholarly journals Gendering expert work and ideal candidacy in Finnish and Estonian job advertisements

2018 ◽  
Vol 33 (7) ◽  
pp. 544-560 ◽  
Author(s):  
Jatta Jännäri ◽  
Seppo Poutanen ◽  
Anne Kovalainen
Keyword(s):  
Design Methodology ◽  
Doing Gender ◽  
Content Type ◽  
Market Structures ◽  
Job Advertisements ◽  
Management Literature ◽  
Global Construction ◽  
Managerial Positions ◽  
Definition Of ◽  
The Ideal

Purpose This paper aims to analyse the ways the textual materials of job advertisements do the gendering for prospective expert positions and create a space for ambiquity/non-ambiquity in the gender labelling of this expertise. Expert positions are almost always openly announced and are important to organizations because they often lead to higher managerial positions. By gendering the prospective positions, the job advertisements bring forth repertoires strengthening the gendering of work and gendered expert employee positions. Design/methodology/approach This study draws on qualitative textual and visual data of open job advertisements for expert positions. The materials of the study are gathered from open job advertisements in two countries, i.e. Finland and Estonia with rather similar labour market structures in relation to gender positions but differing as regards their gender equality. Findings The analyses show that the gendering of expert work takes place in the job advertisements by rendering subtly gendered articulations, yet allowing for interpretative repertoires appear. The analysis reveals some differences in the formulations of the advertisements for expert jobs in the two countries. It also shows that in general the requirements for an ideal expert candidate are coated with superlatives that are gendered in rather stereotypical ways, and that the ideal candidates for highly expert jobs are extremely flexible and follows the ideal of an adaptable and plastic employee, willing to work their utmost. This paper contributes to the “doing gender” literature by adding an analysis of the textual gendering of ideal candidates for positions of expertise. Research limitations/implications The research materials do not expose all the issues pertinent to questions of the ideal gendered candidate. For instance, questions of ethnicity in relation to the definition of the ideal candidate cannot be studied with the data used for this study. Being an exploratory study, the results do not aim for generalizable results concerning job advertisements for expert positions. Originality/value This paper contributes to the “doing gender” and “gendering” literature by addressing the question of how and in what ways gender is defined and done for an expert positions prior the candidates are chosen to those jobs. It also offers new insights into the global construction of gendered expert jobs advertisements by addressing the topic with data from two countries. It further contributes to understanding the gendered shaping of expertise in the management literature.

A critical examination of the regulation of Ponzi scheme in Mauritius

2018 ◽  
Vol 60 (6) ◽  
pp. 1393-1400
Author(s):  
Valerie Uppiah
Keyword(s):  
Research Method ◽  
Design Methodology ◽  
Legal Framework ◽  
Critical Examination ◽  
Financial Crime ◽  
Modus Operandi ◽  
Content Type ◽  
Ponzi Scheme ◽  
Definition Of ◽  
Legal Mechanism

Purpose The purpose of this paper is to analyse the regulation of the financial crime of Ponzi scheme in Mauritius. Contrary to money laundering which has a legal framework to combat it, for Ponzi scheme, there is no specific legal mechanism to combat this particular financial crime. Therefore, the aim of the paper is to provide for an analysis of Ponzi scheme which includes, inter alia, the definition of a Ponzi scheme, its modus operandi and how it should be tackled. Focus will be placed on devising a specific legal framework for it in Mauritius. Design/methodology/approach The research method used to conduct this research and write this paper is a black letter legal research method. An analysis of several laws and cases is carried out so as to provide for the legal background of the research. Findings The investigation conducted in this paper will lead to the conclusion that Mauritius has to devise a law which will specifically combat Ponzi schemes. This law shall provide for the ways to counter this financial crime as well as the duties of the various financial supervisory bodies. Originality/value The paper provides for an analysis of the operation of Ponzi scheme in the Mauritian context. The paper also examines the existing legal framework that combats this financial crime in Mauritius and highlights its strengths and weaknesses.

20 years of ETHICOMP: time to celebrate?

2015 ◽  
Vol 13 (3/4) ◽  
pp. 166-175 ◽  
Author(s):  
Bernd Carsten Stahl ◽  
Charles M Ess
Keyword(s):  
Design Methodology ◽  
Ethical Issues ◽  
Special Issue ◽  
Content Type ◽  
Conference Series ◽  
Design Build ◽  
The World ◽  
Definition Of ◽  
Important Building Block ◽  
Academic Debate

Purpose – The purpose of this paper is to give an introduction to the special issue by providing background on the ETHICOMP conference series and a discussion of its role in the academic debate on ethics and computing. It provides the context that influenced the launch of the conference series and highlights its unique features. Finally, it provides an overview of the papers in the special issues. Design/methodology/approach – The paper combines an historical account of ETHICOMP and a review of the existing papers. Findings – ETHICOMP is one of the well-established conference series (alongside IACAP and CEPE) focused on ethical issues of information and computing. Its special features include: multidisciplinary and diversity of contributors and contributions; explicit outreach to professionals whose work is to design, build, deploy and maintain specific computing applications in the world at large; creation of knowledge that is accessible and relevant across fields and disciplines; intention of making a practical difference to development, use and policy of computing principles and artefacts; and creation of an inclusive, supportive and nurturing community across traditional knowledge silos. Originality/value – The paper is the first one to explicitly define the nature of ETHICOMP which is an important building block in the future development of the conference series and will contribute to the further self-definition of the ETHICOMP community.

Secondary analysis in the social sciences and its relation to futures studies

2015 ◽  
Vol 23 (2) ◽  
pp. 128-139 ◽  
Author(s):  
Cristiano Vezzoni
Keyword(s):  
Social Sciences ◽  
Design Methodology ◽  
Secondary Analysis ◽  
Sociology Of Religion ◽  
Future Scenarios ◽  
Futures Studies ◽  
Content Type ◽  
Research And Teaching ◽  
The Social ◽  
Definition Of

Purpose – The purpose of this paper is to show the importance of secondary analysis to social sciences and to futures studies, both for research and teaching purposes. Design/methodology/approach – An illustration of the main characteristics of secondary analysis, presenting it as a theory-driven activity where the definition of the research design plays a fundamental role. Findings – This paper extends the secondary analysis approach to the study of the future. The utility of secondary analysis for futures studies is illustrated by means of the presentation of two examples developed in the field of the sociology of religion. Originality/value – The results are useful for those who want to develop sound and robust approaches to the study of social change, taking into consideration the simulation of possible future scenarios.

Brazil: monetary policy and the neutral interest rate

2016 ◽  
Vol 43 (6) ◽  
pp. 966-979
Author(s):  
Cleomar Gomes da Silva ◽  
Rafael Cavalcanti de Araújo
Keyword(s):  
Monetary Policy ◽  
Interest Rate ◽  
Real Interest Rate ◽  
Design Methodology ◽  
Macroeconomic Model ◽  
Natural Rate ◽  
Content Type ◽  
Natural Rate Of Interest ◽  
The Interest Rate ◽  
Definition Of

Purpose The purpose of this paper is to analyze the conduct of monetary policy in Brazil and estimate the country’s neutral real interest rate. Design/methodology/approach The authors make use of a state-space macroeconomic model representation. Findings The period of analysis goes from 2003 up to the end of 2013 and the results show that the country’s natural rate of interest was around 4.2 percent in December 2013. Originality/value One of the main differences of this work is the inclusion of variables such as the real exchange rate and world interest rate. This is important because these variables play an important role in the definition of the interest rate and, consequently, in the definition of the neutral interest rate.

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