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On The Appropriateness Of Attribute-level-ordering Approach In Vertical Product Line Design
김길선(Kilsun Kim),Dilip Chhajed(Dilip Chhajed) 한국경영과학회 2002 한국경영과학회 학술대회논문집 Vol.2002-A No.-
We consider a vertical product line design problem for a monopolist where products are designed with quality-type attributes and customers exhibit an ordered pattern in attribute part worth. In this paper, we examine the appropriateness of attribute-level ordering approach In designing a vertical product line, and show that the approach, although used widely in practice, is not optimal and can lead to an arbitrarily bad design.<br/> Furthermore, we present a sufficient condition when attribute-level-ordering is optimal.
Hwang, Sunyong,Kwon, Hyunah,Chhajed, Sameer,Byon, Ji Won,Baik, Jeong Min,Im, Jiseong,Oh, Sang Ho,Jang, Ho Won,Yoon, Seok Jin,Kim, Jong Kyu The Royal Society of Chemistry 2013 The Analyst Vol.138 No.2
<P>We present high performance gas sensors based on an array of near single crystalline TiO<SUB>2</SUB> nanohelices fabricated by rotating oblique angle deposition (OAD). The combination of large surface-to-volume ratio, extremely small size (<30 nm) comparable to the Debye length, a near single crystallinity of TiO<SUB>2</SUB> nanohelices, together with the unique top-and-bottom electrode configuration hugely improves the H<SUB>2</SUB>-sensing performance, including ∼10 times higher response at 50 ppm, approximately a factor of 5 lower detection limit, and much faster response time than the conventional TiO<SUB>2</SUB> thin film devices. Beyond such remarkable performance enhancement, the excellent compatibility of the OAD method compared with the conventional micro-fabrication technology opens a new avenue for monolithic integration of high-performance chemoresistive sensors to fabricate a simple, low cost, reliable, yet fully functional electronic nose and multi-functional smart chips for <I>in situ</I> environmental monitoring.</P> <P>Graphic Abstract</P><P>A near single crystalline TiO<SUB>2</SUB> nanohelix array simply fabricated by an oblique angle deposition method showed enhanced gas sensing performance. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2an35932d'> </P>
Oh, Seung Jae,Chhajed, Sameer,Poxson, David J,Cho, Jaehee,Schubert, E Fred,Tark, Sung Ju,Kim, Donghwan,Kim, Jong Kyu Optical Society of America 2013 Optics express Vol.21 No.1
<P>The performance enhancement of polycrystalline Si solar cells by using an optimized discrete multilayer anti-reflection (AR) coating with broadband and omni-directional characteristics is presented. Discrete multilayer AR coatings are optimized by a genetic algorithm, and experimentally demonstrated by refractive-index tunable SiO2 nano-helix arrays and co-sputtered (SiO2)x(TiO2)1?x thin film layers. The optimized multilayer AR coating shows a reduced total reflection, leading to the high incident-photon-to-electron conversion efficiency over a correspondingly wide range of wavelengths and incident angles, offering a very promising way to harvest more solar energy by virtually any type of solar cells for a longer time of a day.</P>
A Note on Multidimensional Fractional Calculus Operators Involving Gauss Hypergeometric Functions
Raina, R.K.,Chhajed, Pramod kr. Department of Mathematics 2005 Kyungpook mathematical journal Vol.45 No.1
Making use of the multidimensional fractional calculus operators introduced in [20], this paper gives the images under these operators of the celebrated Fox's H-function. Special cases are briefly point out, and some of the results are also studied on general spaces of functions $M_{\lambda}(R_{+}^n)$.