http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Innovative Technique to Produce Test Codes from Predefined Design Information
Shamil Al-Ameen,Roua Al-Taie,Zohair Al-Ameen 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.4
During any system's development life cycle, software testing is considered an important and key phase. Even so, the testing phase is commonly the first phase to be removed when time and resources constraints are faced due to its high consumption of recourses. As a result, developers waste their time and effort on developing software that is either filled with bugs or mismatches user specifications. The excessive work and time spent to program and execute a test case takes approximately 70% of a project's resources. The goal of this work is to produce a practical implementation of the extreme programming as a software development methodology that focuses on generating test cases from the design information before initiating the coding phase. Furthermore, a competent testing tool is built to employ the available information in the related design diagrams, Class and State diagram, wherein it automatically generates transition sequences to test any software system. The proposed tool can reduce the time, cost, and human resources used to test or redesign the system when it mismatches user specifications and requirements.
Ameen, S.,Shaheer Akhtar, M.,Shin, H.S. North-Holland 2013 Materials letters Vol.106 No.-
The aligned zinc oxide (ZnO) nanotubes (NTs) thin film was grown on fluorine doped tin oxide (FTO) substrates by low temperature solution method and utilized as a smart working electrode for the fabrication of ethanolamine chemical sensor. The synthesized ZnO possessed well crystalline tubular morphology with typical hexagonal wurtzite phase. The aligned ZnO NTs thin film presented a good optical band gap of ~3.31eV which was nearly close to the bulk ZnO nanomaterials. The fabricated ethanolamine chemical sensor based on aligned ZnO NTs thin film electrode showed significantly high sensitivity of ~37.4x10<SUP>-4</SUP>mAmM<SUP>-1</SUP>cm<SUP>-2</SUP>, good linearity of ~0.05mM-1mM and the detection limit of ~19.5@?M with correlation coefficient ® of ~0.9850.
Ameen, Sadia,Akhtar, M. Shaheer,Seo, Hyung-Kee,Nazeeruddin, Mohammad Khaja,Shin, Hyung-Shik The Royal Society of Chemistry 2015 Dalton Transactions Vol.44 No.14
<P>In this work, the effects of a titanium (Ti) layer on the charge transport and recombination rates of flexible perovskite solar cells were studied. Ti as an efficient barrier layer was deposited directly on PET-ITO flexible substrates through RF magnetic sputtering using a Ti-source and a pressure of ∼5 mTorr. A Ti coated PET-ITO was used for the fabrication of a flexible perovskite solar cell without using any metal oxide layer. The fabricated flexible perovskite solar cell was composed of a PET-ITO/Ti/perovskite (CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>)/organic hole transport layer of 2,2′,7,7′-tetrakis [<I>N</I>,<I>N</I>′-di-<I>p</I>-methoxyphenylamine]-9,9′-spirobifluorene (spiro-OMeTAD)-Li-TFSI/Ag. A high conversion efficiency of ∼8.39% along with a high short circuit current (<I>J</I><SUB>SC</SUB>) of ∼15.24 mA cm<SUP>−2</SUP>, an open circuit voltage (<I>V</I><SUB>OC</SUB>) of ∼0.830 V and a high fill factor (FF) of ∼0.66 was accomplished by the fabricated flexible perovskite solar cell under a light illumination of ∼100 mW cm<SUP>−2</SUP> (1.5 AM). Intensity-modulated photocurrent (IMPS)/photovoltage spectroscopy (IMVS) studies demonstrated that the fabricated flexible perovskite solar cell considerably reduced the recombination rate.</P> <P>Graphic Abstract</P><P>The effects of a titanium (Ti) layer on the charge transport and recombination rates of flexible perovskite solar cells were studied. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4dt03920c'> </P>
Advanced ZnO-graphene oxide nanohybrid and its photocatalytic Applications
Ameen, S.,Shaheer Akhtar, M.,Seo, H.K.,Shik Shin, H. North-Holland 2013 Materials letters Vol.100 No.-
A nanohybrid of Zinc oxide (ZnO)-graphene oxide (GO) was synthesized by chemical route and utilized as an effective photocatalyst for the photodegradation of crystal violet (Cv) dye. The substantially mixed ZnO-GO nanohybrid was formed by the introduction of GO during the synthesis of ZnO. Prepared ZnO-GO nanohybrid showed the better optical properties and exhibited the good interaction between GO and ZnO. The photocatalytic activity of ZnO-GO nanohybrid was analyzed by performing the photodegradation of Cv-dye under light illumination. Enormously high degradation of Cv-dye by ~95% within 80min was observed over the surface of advanced ZnO-GO nanohybrid, which might attribute to the presence of GO sheets as a supporting material and high e<SUP>-</SUP>-h<SUP>+</SUP> pair separation under light illumination.
Mineralization of rhodamine 6G dye over rose flower-like ZnO nanomaterials
Ameen, S.,Shaheer Akhtar, M.,Seo, H.K.,Shin, H.S. North-Holland 2013 Materials letters Vol.113 No.-
The rose flower-like ZnO nanomaterials (R-ZnO) were synthesized by the chemical route for the photocatalytic degradation of rhodamine 6G (Rh6G) dye. Each R-ZnO was composed of several sheet like petals of average thickness of ~100-150nm. The synthesized R-ZnO photocatalyst showed enormously high degradation rate of ~96% within 60min towards Rh6G-dye under UV light illumination. The fast photodegradation might attribute to the rapid generation of oxyradical through e-h<SUP>+</SUP> separation pairs between the conduction (CB) and valence band (VB) of ZnO. The mass spectroscopy was carried out to investigate the mineralized intermediates after the photocatalytic degradation of Rh6G-dye.
Ameen, S.,Shaheer Akhtar, M.,Seo, H.K.,Shik Shin, H. North-Holland 2014 Materials Letters Vol. No.
Graphene oxide (GO)-ZnO quantum dots (QDs) thin film electrode was prepared by the deposition of ZnO QDs through spin coating over the surface of electrophoretic deposited (EPD) GO on FTO substrate. The interaction of ZnO QDs with GO surface was confirmed by the crystalline, structural and optical properties of GO-ZnO QDs thin film. The prepared GO-ZnO QDs thin film was utilized as working electrode in chemical sensor for the low level detection of ethyl acetate (EA). GO-ZnO QDs thin film electrode based EA chemical sensor exhibited substantially high sensitivity of ~16.035mAmM<SUP>-1</SUP>cm<SUP>-2</SUP>, the limit of detection (LOD) of ~26@?M, limit of quantification (LOQ) of ~80@?M with correlation coefficient ® of ~0.97879.
Ameen, Sadia,Akhtar, M. Shaheer,Seo, Hyung-Kee,Shin, Hyung-Shik American Chemical Society 2014 Langmuir Vol.30 No.43
<P>A high performance perovskite solar cell was fabricated using the distinguished morphology of polyaniline nanoparticles (PANI-NPs) as an efficient hole transporting layer (HTL) with methylammonium lead iodide perovskite (CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>) as sensitizer. PANI-NPs were simply synthesized by the oxidative chemical polymerization of aniline monomer at 0–5 °C. A reasonable solar-to-electricity conversion efficiency of ∼6.29% with a high short circuit current (<I>J</I><SUB>SC</SUB>) of ∼17.97 mA/cm<SUP>2</SUP> and open circuit voltage (<I>V</I><SUB>OC</SUB>) of ∼0.877 V were accomplished by Ag/PANI-NPs/CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>/mp-anatase-TiO<SUB>2</SUB>/bl-TiO<SUB>2</SUB>/FTO perovskite solar cell. The transient photocurrent and photovoltage studies revealed that the fabricated solar cell showed better charge transport time, diffusion coefficient, diffusion length, and charge collection efficiency. Herein, the use of PANI-NPs as the HTL improved the charge carrier generation and the charge collection efficiency of the fabricated solar cell.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2014/langd5.2014.30.issue-43/la502398x/production/images/medium/la-2014-02398x_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la502398x'>ACS Electronic Supporting Info</A></P>