Understanding antecedents to perceived information risks : An empirical study of the Korean telecommunications market

Libaque-Sa&#x301,enz, Christian Fernando,Wong, Siew Fan,Chang, Younghoon,Ha, Young Wook,Park, Myeong-Cheol SAGE Publications 2016 INFORMATION DEVELOPMENT Vol.32 No.1

<P>With increasing usage of electronic devices, people are creating digital footprints of their everyday actions. These footprints come in the form of big data, and can provide useful insights into customer preferences, thus enabling companies to gain business benefits. However, customers may perceive usage of their personal information as a threat. The telecommunications sector is facing this issue. It is capable of collecting huge amount of data due to wide usage of smartphones and mobile Internet. Yet, it is unable to capitalize on these data. To manage customer perception of information risks in giving telecommunications companies permission to use their personal information, this study examines factors that influence customers’ risk perception. A survey of 512 Internet panel members in Korea shows that information practices play an important role in shaping information privacy concerns, trust, and perceived information risks. Information privacy concern is the strongest predictor of perceived information risks, followed by perceived data control, and trust. Perceived policy awareness and perceived information protection significantly influence perceived data control. The findings imply that telecommunications companies ought to increase the level of customer trust, improve their information practices, and reduce customers’ information privacy concerns if they want to lower customer perception toward information risks.</P>

Labile Zinc-Assisted BiologicalPhosphate Chemosensingand Related Molecular LogicGating Interpretations

Kim, Kibong,Ha, Yonghwang,Kaufman, Le&#x301,o,Churchill, David G. American ChemicalSociety 2012 Inorganic chemistry Vol.51 No.2

<P>Herein, molecular fluorescence 'OFF-ON' behavior with aqueous addition of biological phosphate and Zn(2+) is studied with Zn(2)(slys)(2)Cl(2) [H(2)slys = 6-amino-2-{(2-hydroxybenzylidene)amino}hexanoic acid], a fluorescent water-soluble complex, using various spectroscopic tools (e.g., (31)P NMR, UV-vis, emission, and CD spectroscopy) at the micromolar level. Adduct-dependent fluorescence intensity changes can be interpreted as a two-input (cation/anion) implication molecular logic gating system. A displacement study of PPi from the dizinc complex is also reported. Diphosphate and triphosphate addition/displacements were also studied. (31)P NMR spectroscopy shows gradual NMR peak shifts from bound ADP/GDP to free ADP/GDP with increasing [PPi]. In the emission spectrum, fluorescence quenching is shown: CD signal maxima decrease with addition of PPi. These displacement events are also tested with triphosphates (ATP, GTP), and their binding strength/displacement ability over ADP/GDP is quantified: PPi > ATP approximate to GTP (3.35 +/- 0.77 X 10(4) M(-1) for PPi, 7.73 +/- 1.79 X 10(3) M(-1) for ATP, 9.21 +/- 2.88 X 10(3) M(-1) for GTP over 1.ADP). Many anions and cations were also screened for selectivity. Tubulin polymerization was assayed in the presence of 1 and its copper analogue which reflected a slight inhibition in polymerization.</P>

Multiwavelength Light-Responsive Au/B-TiO₂ Janus Micromotors

Jang, Bumjin,Hong, Ayoung,Kang, Ha Eun,Alcantara, Carlos,Charreyron, Samuel,Mushtaq, Fajer,Pellicer, Eva,Bu&#x308,chel, Robert,Sort, Jordi,Lee, Sung Sik,Nelson, Bradley J.,Pane&#x301,, Salvador American Chemical Society 2017 ACS NANO Vol.11 No.6

<P>Conventional photocatalytic micromotors are limited to the use of specific wavelengths of light due to their narrow light absorption spectrum, which limits their effectiveness for applications in biomedicine and environmental remediation. We present a multiwavelength light-responsive Janus micromotor consisting of a black TiO<SUB>2</SUB> microsphere asymmetrically coated with a thin Au layer. The black TiO<SUB>2</SUB> microspheres exhibit absorption ranges between 300 and 800 nm. The Janus micromotors are propelled by light, both in H<SUB>2</SUB>O<SUB>2</SUB> solutions and in pure H<SUB>2</SUB>O over a broad range of wavelengths including UV, blue, cyan, green, and red light. An analysis of the particles’ motion shows that the motor speed decreases with increasing wavelength, which has not been previously realized. A significant increase in motor speed is observed when exploiting the entire visible light spectrum (>400 nm), suggesting a potential use of solar energy, which contains a great portion of visible light. Finally, stop–go motion is also demonstrated by controlling the visible light illumination, a necessary feature for the steerability of micro- and nanomachines.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2017/ancac3.2017.11.issue-6/acsnano.7b02177/production/images/medium/nn-2017-02177v_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn7b02177'>ACS Electronic Supporting Info</A></P>

Resonant Coherent Phonon Generation in Single-Walled Carbon Nanotubes through Near-Band-Edge Excitation

Lim, Yong-Sik,Ahn, Jae-Geum,Kim, Ji-Hee,Yee, Ki-Ju,Joo, Taiha,Baik, Sung-Hoon,Há,roz, Erik H.,Booshehri, Layla G.,Kono, Junichiro American Chemical Society 2010 ACS NANO Vol.4 No.6

<P>We have observed large-amplitude coherent phonon oscillations of radial breathing modes (RBMs) in single-walled carbon nanotubes excited through the lowest-energy (<I>E</I><SUB>11</SUB>) interband transitions. In contrast to the previously studied coherent phonons excited through higher-energy (<I>E</I><SUB>22</SUB>) transitions, these RBMs show comparable intensities between (<I>n</I>−<I>m</I>) mod 3 = +1 and −1 nanotubes. We also find the novel observation of RBMs excited over an excitation range of ∼300 meV above the <I>E</I><SUB>11</SUB> transition, which we attribute to possible resonance with phonon sidebands of the lowest optical transition, arising from strong exciton−phonon coupling.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-6/nn100055e/production/images/medium/nn-2010-00055e_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn100055e'>ACS Electronic Supporting Info</A></P>

Multidomain-Based Responsive Materials with Dual-Mode Optical Readouts

You, Yil-Hwan,Biswas, Aniket,Nagaraja, Ashvin T.,Hwang, Jin-Ha,Cote&#x301,, Gerard L.,McShane, Michael J. American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.15

<P>Responsive materials designed to generate signals for both surface-enhanced Raman spectroscopy (SERS) and phosphorescence lifetime-“dual-mode”-measurements are described. To demonstrate this concept, we incorporated pH-sensitive and oxygen-sensitive microdomains into a single hydrogel that could be interrogated via SERS and phosphorescence lifetime, respectively. Microdomains consisted two populations of discrete microcapsules containing either (1) gold nanoparticles capped with pH-sensitive Raman molecules or (2) oxygen-sensitive benzoporphyrin phosphors. While the microdomain-embedded hydrogels presented an expected background luminescence, the pH-sensitive SERS signal was distinguishable for all tested conditions. Response characteristics of the dual sensor showed no significant difference when compared to standalone single-mode pH and oxygen sensors. In addition, the feasibility of redundant multimode sensing was proven by observing the reaction produced by glucose oxidase chemically cross-linked within the corresponding alginate matrix. Each optical mode showed a signal change proportional to glucose concentration with an opposite signal directionality. These results support the promise of micro-/nanocomposite materials to improve measurement accuracy using intrinsic multimode responses and built-in redundancy, concepts that have broad appeal in the chemical sensing and biosensing fields.</P> [FIG OMISSION]</BR>

Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films

Je, Soong-Geun,Vallobra, Pierre,Srivastava, Titiksha,Rojas-Sa&#x301,nchez, Juan-Carlos,Pham, Thai Ha,Hehn, Michel,Malinowski, Gregory,Baraduc, Claire,Auffret, Ste&#x301,phane,Gaudin, Gilles,Mangin, St American Chemical Society 2018 NANO LETTERS Vol.18 No.11

<P>Magnetic skyrmions are topologically nontrivial spin textures which hold great promise as stable information carriers in spintronic devices at the nanoscale. One of the major challenges for developing novel skyrmion-based memory and logic devices is fast and controlled creation of magnetic skyrmions at ambient conditions. Here we demonstrate controlled generation of skyrmion bubbles and skyrmion bubble lattices from a ferromagnetic state in sputtered ultrathin magnetic films at room temperature by a single ultrafast (35 fs) laser pulse. The skyrmion bubble density increases with the laser fluence, and it finally becomes saturated, forming disordered hexagonal lattices. Moreover, we present that the skyrmion bubble lattice configuration leads to enhanced topological stability as compared to isolated skyrmions, suggesting its promising use in data storage. Our findings shed light on the optical approach to the skyrmion bubble lattice in commonly accessible materials, paving the road toward the emerging skyrmion-based memory and synaptic devices.</P> [FIG OMISSION]</BR>

Ultrafast Generation of Fundamental and Multiple-Order Phonon Excitations in Highly Enriched (6,5) Single-Wall Carbon Nanotubes

Lim, Yong-Sik,Nugraha, Ahmad R. T.,Cho, Sung-Jae,Noh, Min-Young,Yoon, Eun-Jin,Liu, Huaping,Kim, Ji-Hee,Telg, Hagen,Há,roz, Erik H.,Sanders, Gary D.,Baik, Sung-Hoon,Kataura, Hiromichi,Doorn, Step American Chemical Society 2014 NANO LETTERS Vol.14 No.3

<P>Using a macroscopic ensemble of highly enriched (6,5) single-wall carbon nanotubes, combined with high signal-to-noise ratio and time-dependent differential transmission spectroscopy, we have generated vibrational modes in an ultrawide spectral range (10–3000 cm<SUP>–1</SUP>). A total of 14 modes were clearly resolved and identified, including fundamental modes of A, E<SUB>1</SUB>, and E<SUB>2</SUB> symmetries and their combinational modes involving two and three phonons. Through comparison with continuous wave Raman spectra as well as calculations based on an extended tight-binding model, we were able to identify all the observed peaks and determine the frequencies of the individual and combined modes. We provide a full summary of phonon frequencies for (6,5) nanotubes that can serve as a basic reference with which to refine our understanding of nanotube phonon spectra as well as a testbed for new theoretical models.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-3/nl404536b/production/images/medium/nl-2013-04536b_0005.gif'></P>