bluuebunny/crossref_metadata_2025 huggingface dataset:
Compact multiband monopole antenna for UMTS, WiMAX, and WLAN applications
Authors: Jalali A.R. , Ahamdi‐Shokouh J. , Emadian S.R.
Published: February 2016

In this letter, a compact multiband microstrip‐fed planar monopole antenna is presented. The proposed antenna has three resonance modes which cover three bands of wireless standards including universal mobile telecommunications system band (1920–2170 MHz), 3.5 GHz worldwide interoperability for microwave access band (3.4–3.6 GHz), and 5.2 GHz wireless local area network band (5.15–5.35 GHz). The antenna has a simple structure which consists of a rectangular radiation patch with two symmetric folded slots for size reduction, a step‐shaped microstrip feed line, and a rectangular ground plane. Owing to fully printed, simple and small configuration, the proposed antenna fabrication is cost effective. The designed antenna has a total dimensions of 30 × 34×0.8 mm3 which makes this antenna a good candidate for mobile communication applications. The radiation characteristics such as gain, radiation patterns and radiation efficiency of the suggested antenna are investigated. The antenna radiates Omni‐directionally in H‐plane and bidirectionally in the E‐plane. In this design, very high radiation efficiency over the operating bands is obtained. According to the mentioned advantages, the proposed antenna can be a good choice for multiband wireless applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:844–847, 2016
Compact penta‐band microstrip antenna
Authors: Srivastava Kunal , Kumar Ashwani , Kanaujia Binod K.
Published: February 2016

This article presents the compact penta‐band microstrip antenna. The frequency bands of the antenna are WLAN 2.6 GHz (2.56–2.63 GHz), 3.0 GHz (2.94–3.05 GHz), WiMax 3.4 GHz (3.34–3.55 GHz), 4.85 GHz (4.81–4.92 GHz) and WLAN 5.3 GHz (5.27–5.34 GHz). The antenna is rectangular spiral shape and size of the antenna is 20 × 20 mm2. The structures are analysed using Ansoft HFSS v.11 based on Finite Element Method (FEM) and measured results satisfy the simulated results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:836–838, 2016
Frequency multiplexing spatial super‐resolved sensing for RADAR applications
Authors: Mizrahi Moshe , Holdengreber Eldad , Farber Eli , Zalevsky Zeev
Published: February 2016

In this article a RADAR scanning method, based on microwave photonics was presented. The operation principle was based on an antenna array radiating on a far‐field target, where the radiation spectral curve was divided so that different spatial sub resolution segments within the target area were illuminated by a different microwave frequency. Thus, although the radiation that is back reflected from those spatially sub resolution segments was mixed in the detecting single small aperture antenna, due to the frequency encoding, their detector could back separate them and could reconstruct signal with higher spatial resolving capability. Experimental and simulation results were presented for one‐dimensional and two‐dimensional antenna array. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:831–835, 2016
Omnidirectional wide‐band E‐shaped cylindrical patch antenna with horizontal polarization
Authors: Svezhentsev Alexander Y. , Volski Vladimir , Yan Sen , Vandenbosch Guy A.E.
Published: February 2016

An omnidirectional wide‐band cylindrical microstrip array antenna (CMAA) in the frequency range 2.05–2.55 GHz with horizontal polarization is proposed. The antenna consists of two radiating elements fed by probes and symmetrically located on the opposite sides of a textile substrate mounted on a ground cylinder. The radiating element consists of two strongly coupled E‐shaped patches connected by a microstrip line. A prototype has been fabricated and measured. The deviation of the radiation pattern from omnidirectionality in the horizontal plane does not exceed 4 dB. The reached −10 dB bandwidth is 22% and the directivity is 2.14 dBi at 2.3 GHz. The agreement between simulations and measurements is good. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:875–877, 2016
AN e‐shaped slotted‐circular‐patch antenna for circularly polarized radiation and radiofrequency energy harvesting
Authors: Bernard Loo B.K. , Nasimuddin  , Alphones A.
Published: February 2016

An e‐shaped slotted‐circular‐patch antenna is proposed for circularly polarized (CP) radiation and RF energy harvesting. The proposed antenna consists of an e‐shaped slotted‐circular‐patch radiator and a coaxial feed. An e‐shaped slot is cut along the orthogonal axis of a circular‐patch with a coaxial feed along the diagonal axis to generate CP radiation with compact antenna size of 45 × 45 × 1.6 mm. The prototype antenna shows the measured gain more than 5 dBic at 2.4 GHz with 3 dB axial ratio beamwidth more than 140°. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:868–875, 2016
Modeling of two‐pump optical frequency comb generation in monolithic silicon nitride ring resonator
Authors: Wang Rui
Published: February 2016

The two‐pump Four‐Wave‐Mixing (FWM) in the ring resonator promises more agile compact frequency comb generation than the traditional singe‐pump scheme regarding the convenient tuning of comb line space by modifying the two pumps’ space. The silicon‐nitride‐ring‐resonator‐based optical frequency comb generation system input with two pumps for the parametric process is simulated by an iterative process relying on the split‐step Fourier method. The influences of the coupling coefficient and pumps’ frequencies on the comb spanning are explained in terms of Q factor and resonance condition of the ring. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:919–921, 2016
Bandpass filter based on novel‐coupled half‐wavelength microstrip ring resonators
Authors: Olokede Seyi S. , Zubir Ihsan A. , Ain Mohd F. , Ahmad Zainal A.
Published: February 2016

A microstrip bandpass filter (BPF) based on centre‐coupled cylindrical microstrip ring resonator (MRR) for wireless application in ISM frequency band of applications is presented. The proposed is a combination of two identical bended half‐wavelength (λ/2) MRR, and centre‐coupled by an end‐coupled transmission feed line. The equivalent circuits of the MRR, the end‐coupled feed, and the effects of various spacing between them were investigated based on the even‐ and odd‐mode theory. The mechanism of resonant mode splitting is investigated with the possibility of enhancing the coupling effect, while suppressing spurious resonances in order to achieve sharp rejection skirts. Findings indicates that the proposed equivalent circuit are influenced by capacitances due to resonator – transmission feed line gap (d), the gap between each ring (g), the feed line gap (i), the radius of MRR (r), and the resonator head (m). The operation mechanism of the structure was investigated first theoretically to the intent of design a circuit model, then using numerical 3D EM based on finite integration technique (FIT) method, and finally, through 2D equivalent circuit modeller. The derived equivalent circuit model have been validated both by analytical formulae and numerical simulations. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:911–918, 2016
Extremely wideband printed monopole antenna with dual rejection bands
Authors: Amiri Zhale , Movagharnia Sima , Masoumi Masoume , Shokry Majed , Virdee Bal S.
Published: February 2016

An extremely wideband (EWB) microstrip antenna is presented that is designed with band rejection characteristics at C and WLAN bands. This is achieved by embedding inside the inverted triangular shaped patch a pair of L‐shaped slits that have been rotated by ±90° so that they are horizontal and downward facing, and topping the patch with an arrow‐shaped strip. The feedline to the patch also needs to be backed with a trapezoid shaped ground‐plane. The center frequency of the notched bands can be easily controlled by altering the parameters of the slits and arrow‐shaped strip. The low‐profile antenna essentially radiates omni‐directionally and has a measured impedance bandwidth of 18.9 GHz (2.9–21.8 GHz) with a VSWR ≤ 2, except at the two rejection bands. The antenna has an average gain > 3 dBi. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:908–911, 2016
Low‐cost antenna design for RFID readers using multiobjective optimization
Authors: Oliveira Diogo B. , Lisboa Adriano C. , Fonseca Leandro A. C. , Silva Elson. J. , Adriano Ricardo
Published: February 2016

This article presents a systematic methodology to aid design a low‐cost patch antenna for RFID readers. The geometric antenna parameters are found using multiobjective optimization for return loss minimization and gain maximization. To assess the use of low‐cost FR‐4 substrate the radiation efficiency has been investigated using software simulations. A prototype antenna was built and its parameters were measured in the anechoic chamber. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:905–908, 2016
A suspended stripline bandpass filter using hybrid transmission line stepped impedance resonator
Authors: Xu ZhaoXu , Hu YiYao , Chen Yongpin P. , Kang Kai , Le Wei Li Joshua
Published: February 2016

In this article, a suspended stripline bandpass filter using hybrid transmission line stepped impedance resonator (HTLSIR) is proposed. SSL has been proven to be an excellent transmission‐line system for realizing different types of filters. However, due to the effective permittivity being too close to unity, the size of the distributed elements is usually very large. The novel resonator introduced in this letter contains a section of hybrid transmission line which consists of the SSL and the microstrip line. The characteristics of the HTLSIR have been analyzed clearly. The novel SSL filter is designed, fabricated, and tested. Both simulated and measured results are presented. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:892–895, 2016
Small‐size narrow open‐slot antenna for the 2.4/5.2/5.8‐GHz WLAN operation along the side edge of the metal‐framed smartphone
Authors: Wong Kin‐Lu , Lu Jun‐Yu
Published: February 2016

A small‐size narrow open‐slot antenna with 1‐mm slot width and 12.7‐mm slot length promising to be disposed in the narrow region along the side edge of the metal‐framed smartphone for the 2.4/5.2/5.8‐GHz WLAN operation is presented. This study exploits the narrow region between the display panel and the casing of the metal‐framed smartphone to dispose the internal antenna therein. The proposed antenna is fed using a microstrip feedline with its tuning stub disposed within the slot, thereby keeping narrow width of the antenna. The open slot (denoted as a first slot) has a 1‐mm opening disposed at the metal frame, and its length corresponds to only about 0.1 wavelength at 2450 MHz, which supports a fundamental open‐slot mode to cover the 2.4 GHz band. In addition, with a chip capacitor (1.1 pF) loaded at a proper position across the first slot, the antenna can be reconfigured at about 5.2 GHz to create a new resonant open slot (second slot) from the capacitor to the slot opening. This second slot contributes to a new resonant mode for the antenna to cover the 5.2 GHz band. By embedding a series chip inductor (1.5 nH) in the microstrip feedline, a higher‐order slot mode supported by the first slot can be shifted to cover the 5.8 GHz band. The antenna can hence cover the 2.4/5.2/5.8‐GHz WLAN operation with a compact and narrow slot structure. Details of the proposed antenna are described. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:886–892, 2016
A 3–7 GHz GaNHEMT power amplifier
Authors: Cheng Zhiqun , Zhu Dandan , Yan Guoguo , Liu Guohua , Gao Steven
Published: February 2016

An ultra‐broadband power amplifier (PA) with TGF2023‐2‐10 GaN HEMT operating in the frequency of 3–7 GHz is presented in this article. The GaN HEMT transistor is modeled and the frequency compensation and multi impedance matching approach with different characteristic impedances of transmission line are employed for broadband impedance matching. The measured results agree well with the simulated results. The PA has output power of more than 41.2 dBm and small‐signal gain of 8 dB at the frequency range of 3–7 GHz under DC bias of Vds = 28 V, Vgs = −2.98 V. Details of device modeling, amplifier designs, and simulated and measured results are presented and discussed. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:901–904, 2016
Realization of all‐optical logic gates using injection locking in a distributed feedback laser diode
Authors: Qureshi Khurram K.
Published: February 2016

In this article, we experimentally demonstrate an all‐optical inverter and NOR logic working at 10 Gbit/s using injection locking technique in a Distributed Feedback laser diode. The proposed optical inverter operate at 10 Gb/s with very good extinction ratio of around 15 dB with a power penalty of only 2 dB at BER of 10−9. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:940–944, 2016
Metamaterial inspired monopole antenna for WLAN/WiMAX applications
Authors: Imaculate Rosaline S. , Raghavan S.
Published: February 2016

A compact hexagonal‐shaped split ring radiating monopole with multiple band notched characteristics is presented in this article. The proposed antenna is printed on a 24 × 22.5 × 0.8 mm3 FR‐4 substrate and it operates in the WLAN 2.4/5.2/5.8 GHz bands and WiMAX 3.5 GHz band. It yields an impedance bandwidth of 130 MHz centered at 2.45 GHz, 330 MHz centered at 3.5 GHz, and 1540 MHz centered at 5.2 GHz. The extraction of the effective material parameter of the radiating element is discussed, by which the metamaterial property existence and the notch creation is verified. A prototype of the proposed antenna is fabricated and the results are measured, which agrees greatly with the simulated results. Consistent radiation pattern and stable gain are observed over all the operating regions. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:936–939, 2016
Broadband (22–40 GHz) multistage MMIC low‐noise amplifier
Authors: Gao Xingzhen , Yang Shuang , Gu Jianzhong , Wang Wei , Sun Xiaowei
Published: February 2016

In this article, a wideband (22–40 GHz) four‐stage monolithic microwave integrated circuit low noise amplifier has been presented, which was fabricated in WIN 0.15 um pseudomorphic high electron‐mobility transistor technology. The source inductor and interstage mismatching methods were used to realize both low noise and flatten gain simultaneously in wideband. The designed LNA has achieved a gain of 22 ± 1 dB and a noise figure of less than 3 dB from 22 to 40 GHz. The chip size was 2 × 1 mm2, which can be used in active phased‐array receiver modules, millimeter wave imaging, broadband wireless communication systems, and 24‐GHz short‐range sensors. In addition the LNA was worked with only one supply power, which was realized by four self ‐bias resistances. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:956–959, 2016
Coupled line based unequal dual band power divider
Authors: Yadav Amar Nath , Bhattacharjee Ratnajit
Published: February 2016

This article presents theoretical design of dual band unequal power divider based on coupled line structure. The structure consists of two coupled line segments along with five transmission line segments used to satisfy unequal matching characteristic. The isolation is achieved using a circuit, which is a combination of inductor, capacitor, and resistor. Design equations of proposed power divider and the circuit providing isolation are based on circuit representation of ideal transmission lines. Simulation and measured results are given to verify the theoretical design equations. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:953–956, 2016
A simple transformation from lowpass to bandpass filter using a new quasi‐arrow head defected ground structure resonator and gap‐J‐inverter
Authors: Boutejdar Ahmed , Ellatif W. Abd , Ibrahim A. A. , Challal M.
Published: February 2016

In this article, a new compact quasi‐arrow head defected ground structure (DGS) lowpass filter (LPF) is proposed. The proposed DGS behaves as a resonant element which allows size compactness and harmonic suppression in the rejection band. The proposed LPF presents the advantages of compactness, low insertion loss, and ultrawide stopband with 20 dB attenuation from 6 GHz to >20 GHz. The length of the proposed multilayer LPF is reduced to 0.143 λg at 3 GHz in comparison with 0.2 λg for the cascaded topology with λg = 0.157 m. A novel compact bandpass filter (BPF) is presented by utilizing a simple transformation from LPF based on J‐inverter technique. The proposed BPF has low insertion loss and compact size. Finally, the simulated and experimental results of proposed structure are found to be in good agreement with the simulation results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:947–953, 2016
Compact double‐layer substrate integrated waveguide magic Tee for X‐band applications
Authors: Venanzoni Giuseppe , Mencarelli Davide , Morini Antonio , Farina Marco , Losito Onofrio , Prudenzano Francesco
Published: February 2016

A substrate integrated waveguide Magic Tee with very compact size and operating over a wide band is proposed. The circuit is made of two stacked substrates connected by cutting a small aperture between them. This solution presents slightly higher complexity compared to a single substrate magic Tee but it avoids the radiation losses because the circuit is completely closed. A simple and effective procedure is used to design the circuit. A prototype is built and experimental results show a good agreement with simulations. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:932–936, 2016
Double band microwave rectifier for energy harvesting
Authors: Adam Ismahayati , Fareq Abd Malek Mohd , Najib Mohd Yasin Mohd , Rahim Hasliza A.
Published: February 2016

Energy harvesting has been investigated by many researchers due to their ability to generate power by using existing sources which eliminate the need of batteries and power supply that requires extra cost to the system. Rectifier is the main component in energy harvesting where it converts RF sources to DC power. This work presents the design and investigation of the seven‐stage rectifier. A Villard configuration is chosen with consists of two HSMS 2850 Schottky diodes and two through hole ceramic capacitors for each stage. The aim of this article is to study and evaluate the rectifier performance at 550 MHz and 900 MHz frequency range. Rectifier properties such as number of stage, capacitance effects, and variation in capacitor's combination, and are analyzed and discussed in this article. The result shows that the designed rectifier is operate well at the targeted frequencies. Measured results show that voltages of 9.17 V and 3.78 V are obtained for an input of 0 dBm at 900 MHz and 550 MHz, respectively. The circuit is generating 44.4% rectified output than in the reference work. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:922–927, 2016
Wideband RCS reduction of patch array antenna with miniaturized FSS
Authors: Joozdani Mohsen Zahir , Amirhosseini Mohammad Khalaj , Abdolali Ali
Published: February 2016

In this article, radar cross section reduction of 2 × 2 patch array antenna is investigated using band‐stop Frequency selective surface consisted of miniaturized square loop elements. Stop band of FSS is as the same as the frequency band of antenna resonance which is from 3.3 to 3.4 GHz. Ground plane of conventional patch array antenna is substituted by miniaturized FSS except the regions underneath the patches. FSS acts as the ground plane in the stop‐band and is transparent in the other frequencies. Thus, wideband reduction of RCS is obtained from 4 to 9.5 GHz and changes in antenna pattern, gain, and impedance bandwidth in comparison with the ones of conventional patch array antenna are negligible. It is shown that simulation and measurement results are in good agreement with each other. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:969–973, 2016
Compact CPW UWB diversity slot antenna with dual band‐notched characteristics
Authors: Zhu Jianfeng , Feng Botao , Peng Biao , Li Shufang , Deng Li
Published: February 2016

A compact coplanar waveguide (CPW) fed ultrawideband (UWB) slot antenna for multiple‐input‐multiple‐output (MIMO)/diversity applications is presented in this letter. The antenna consists of two coplanar waveguides (CPWs) feeding circular radiating elements and a protruded stub, which is placed at
between them. The circular radiating elements are arrange orthogonally and fed perpendicularly to obtain polarization diversity. Notched band at X‐band communication downlinks is achieved by etching split ring resonator slots in the radiators and the other notched band at WLAN system is achieved by the collaboration of arc‐shaped strips and the protruded stub. The protruded stub not only can help to achieve band rejection but also can reduce mutual coupling between two ports. As all of the structures are printed in one layer, it can be very easily to be integrated with RF front‐end circuits. Simulated and measured results show that the proposed antenna meets the 10‐dB impedance bandwidth from 3.4 to 12 GHz and isolation better than 15 dB at most of the band. Good diversity performance in terms of envelope correlation coefficient and the ratio of mean effective gain demonstrates that the antenna is quite suitable for MIMO UWB applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:989–994, 2016
Miniaturized wideband bandstop filter using an air‐bridge capacitor via gallium‐arsenide based integrated passive device technology
Authors: Dhakal Rajendra , Kim Nam‐Young
Published: February 2016

This letter reports a new implementation of miniaturized wideband bandstop (WBBS) filter using a gallium‐arsenide (GaAs)‐based integrated passive device technology (IPD). The implementation of an air‐bridge capacitor explores the possibility of frequency selectivity from 8.15 to 9.20 GHz. The WBBS filter generates a return loss of −0.50 dB with a rejection depth of −38.01 dB at the resonance frequency of 9.20 GHz. The size of the filter was drastically reduced by implementing a microfabrication (IPD) with folded meandered‐line, featuring the length equal to 0.38 times the guided wavelength (λg) that occupies only 0.22 λg × 0.13 λg of the die area. The selectivity of the filter was reflected by the higher value of return loss with sufficient suppression of out‐of‐band signals close to the resonance frequency. Experimental verification of the filter response demonstrates its potential as a WBBS filter operating in the X‐band frequency spectrum. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:980–985, 2016
A sharp skirt notch filter based feedforward 3rd harmonic cancellation scheme for ultra‐high frequency wireless communication system in 834–879 MHz
Authors: Jung Won‐Jae , Jung Jin‐Woo , Jang Peter , Park Jun‐Seok
Published: February 2016

This article presents a feedforward 3rd harmonic cancellation scheme for ultra‐high frequency (UHF) wireless communication system in 834–879 MHz. The major features are highlighted: a special notch filter with sharp skirt performance (e.g., both lower and higher band edge from 834 to 879 MHz yield lower than −40 dB cutoff), and micro‐controller based amplitude/phase control on feedforward path signal generation for fine harmonic cancellation. A prototype was implemented; it works out 47.36 dB Hz−1 cut‐off and 60 dBc ACLR. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1006–1010, 2016
A novel type of bandpass filter using complementary open‐ring resonator loaded HMSIW with an electric cross‐coupling
Authors: Yan Tengfei , Tang Xiao‐Hong , Xu Zhao‐Xu , Lu Di
Published: February 2016

A novel bandpass filter (BPF) with multiple transmission zeros (TZs) and wide stopband is proposed. The filter is realised using complementary open‐ring resonators (CORRs) loaded half mode substrate integrated waveguide (HMSIW). Besides, a novel electric source‐load electric cross‐coupling configuration is introduced to generate extra attenuation poles at either side of the passband, which improves the passband selectivity and the stopband suppression level. Based on this structure, a BPF operating at 5.8 GHz with multiple transmission zeros is designed and fabricated. The Measurement and simulation results indicate that the proposed configuration is a good candidate for filter design. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:998–1001, 2016
Diet‐induced obesity and insulin resistance are associated with brown fat degeneration in SIRT1‐deficient mice
Authors: Xu Fen , Zheng Xiaobin , Lin Beisi , Liang Hua , Cai Mengyin , Cao Huanyi , Ye Jianping , Weng Jianping
Published: February 2016

Objective

Recent studies have revealed that SIRT1 gain‐of‐function could promote adipose tissue browning for the adaptive thermogenesis under normal diet. This study investigated the role of SIRT1 loss‐of‐function in diet‐induced obesity and insulin resistance and the mechanism involved in adipose tissue thermogenesis.

Methods

Male SIRT1+/− and wild‐type (WT) mice were fed with a high‐fat diet (HFD) for 16 weeks to induce obesity and insulin resistance, while mice on a chow diet were used as lean controls. The phenotype data were collected, and different adipose tissue depots were used for mechanism research.

Results

Compared with WT mice, SIRT1+/− mice exhibited increased adiposity and more severe insulin resistance with less thermogenesis under HFD challenge. Strikingly, SIRT1+/− mice displayed an exacerbated brown adipose tissue (BAT) degeneration phenotype, which was characterized by lower thermogenic activity, aggravated mitochondrial dysfunction, and more mitochondrial loss. In addition, SIRT1+/− mice showed aggravated inflammation and dysfunction in epididymal adipose tissue after HFD intervention, which also contributed to the systemic insulin resistance.

Conclusions

Diet‐induced obesity and insulin resistance are associated with BAT degeneration in SIRT1‐deficient mice, which further underlined the beneficial role of SIRT1 in obesity‐associated metabolic disorders.
Physical activity attenuates the effect of the FTO genotype on obesity traits in European adults: The Food4Me study
Authors: Celis‐Morales Carlos , Marsaux Cyril F.M. , Livingstone Katherine M. , Navas‐Carretero Santiago , San‐Cristobal Rodrigo , O'donovan Clare B. , Forster Hannah , Woolhead Clara , Fallaize Rosalind , Macready Anna L. , Kolossa Silvia , Hallmann Jacqueline , Tsirigoti Lydia , Lambrinou Christina P. , Moschonis George , Godlewska Magdalena , Surwiłło Agnieszka , Grimaldi Keith , Bouwman Jildau , Manios Yannis , Traczyk Iwona , Drevon Christian A. , Parnell Laurence D. , Daniel Hannelore , Gibney Eileen R. , Brennan Lorraine , Walsh Marianne C. , Gibney Mike , Lovegrove Julie A. , Martinez J. Alfredo , Saris Wim H.M. , Mathers John C. ,   on behalf of the Food4Me Study
Published: February 2016

Objective

To examine whether the effect of FTO loci on obesity‐related traits could be modified by physical activity (PA) levels in European adults.

Methods

Of 1,607 Food4Me participants randomized, 1,280 were genotyped for FTO (rs9939609) and had available PA data. PA was measured objectively using accelerometers (TracmorD, Philips), whereas anthropometric measures [BMI and waist circumference (WC)] were self‐reported via the Internet.

Results

FTO genotype was associated with a higher body weight [β: 1.09 kg per risk allele, (95% CI: 0.14‐2.04), P = 0.024], BMI [β: 0.54 kg m−2, (0.23‐0.83), P < 0.0001], and WC [β: 1.07 cm, (0.24‐1.90), P = 0.011]. Moderate‐equivalent PA attenuated the effect of FTO on BMI (P[interaction] = 0.020). Among inactive individuals, FTO increased BMI by 1.06 kg m−2 per allele (P = 0.024), whereas the increase in BMI was substantially attenuated among active individuals (0.16 kg m−2, P = 0.388). We observed similar effects for WC (P[interaction] = 0.005): the FTO risk allele increased WC by 2.72 cm per allele among inactive individuals but by only 0.49 cm in active individuals.

Conclusions

PA attenuates the effect of FTO genotype on BMI and WC. This may have important public health implications because genetic susceptibility to obesity in the presence of FTO variants may be reduced by adopting a physically active lifestyle.
CNV analysis and mutation screening indicate an important role for the NPY4R gene in human obesity
Authors: Aerts Evi , Beckers Sigri , Zegers Doreen , Van Hoorenbeeck Kim , Massa Guy , Verrijken An , Verhulst Stijn L. , Van Gaal Luc F. , Van Hul Wim
Published: February 2016

Objective

Genome‐wide copy number variation (CNV) analyses have associated the 10q11.22 CNV with obesity. As the NPY4R gene is the most interesting candidate gene in this region, it was hypothesized that both genetic and structural variation in NPY4R might be implicated in the pathogenesis of obesity.

Methods

In the first part of this study, 326 children and adolescents with obesity and 298 healthy lean individuals were screened for CNV in the NPY4R‐containing chr.10q11.22 region. In the second part of this study, a mutation screen for variants in the NPY4R coding region was performed in 356 children and adolescents with obesity and 337 healthy lean adults.

Results

Our CNV analysis demonstrated a significantly higher frequency of NPY4R containing 10q11.22 CNV loss in the patient population (P = 0.0003), while CNV gain in this region was more prevalent in the control population (P = 0.031). Mutation analysis resulted in the identification of 15 rare non‐synonymous heterozygous variants. For two variants that could only be identified in the patient population, receptor dysfunction and thus a pathogenic effect were demonstrated.

Conclusions

In conclusion, these data support an essential role for genetic and structural variation within the NPY4R gene in the pathogenesis of obesity.
Quantitative exploration into the diffusion process of creative ideas in economics: Nobel prize laureates
Authors: Kim Meen Chul , Feng Yuanyuan , Zhu Yongjun , Ping Qing
Published: February 2016

In this study, we aim to keep track of how creative ideas in economic sciences have been created and diffused into successive research. Toward that end, we investigate the intellectual landscapes of the Nobel Prize awardees’ research and the articles citing the literature. Our study is based on two sets of bibliographic records retrieved from the Web of Science. The “Creation” dataset, obtained through an author search, contains 1,745 original research and review articles of the laureates. The “Diffusion” dataset, consisting of 134,866 records, was collected by citation expansion. We identified bursting keywords and intellectual landscapes of the domain in creation and diffusion perspectives. We found that the dominant research themes that had influenced the laureates’ research from 1980 till 1999 were macroeconomic tests and economic analysis in time series. Then, the creative ideas have diverged into a variety of issues such as labor market, economic governance, market design, asset pricing, and economic decision making. We identified that these ideas have been diffused into successive research topics such as intertemporal general equilibrium model, reciprocity in economics, estimating profitable asset pricing, and socio‐ecological economics. Finally, it is argued that economic research around the laureates has become divergent over time.
Which VIVO harvester queries best populate the VIVO database with accurate faculty member publications?
Authors: Eldredge Jonathan , Garbin Eric , Kroth Philip J.
Published: February 2016

The National Institutes of Health encourages its research partners to use VIVO™ software to enhance research investigator collaboration. VIVO provides a dynamic online directory to facilitate professional networking opportunities for investigators who share similar or complementary research interests (VIVO, 2015). VIVO Harvester performs author searches in PubMed™ to populate VIVO profiles with article citations. Harvester only provides 65% of the total number of references (Eldredge et al., 2015), however. This study describes how the VIVO Harvester query design impacts Harvester's ability to populate the VIVO database with the correct citations to investigator publications. This action research project analyzed elements critical to optimizing Harvester's accuracy, thereby informing the development of similar queries for other institutions. Institution‐specific knowledge coupled to expert PubMed search skills are essential to optimizing the accuracy of VIVO. This development fosters discovery and enhances translational research capable of benefitting society.
Does author affiliation reputation affect uncitedness?
Authors: Lou Wen , He Jiangen
Published: February 2016

This study analyzes the relation between author affiliation reputation and uncitedness. We use 2015 U.S. News Best Global University Subject rankings as representative of affiliation reputation and collect uncited papers from 24 journals in six subjects from WoS. Preliminary correlation analysis results indicate that: (1) there is a significant correlation between affiliation reputation and uncitedness. (2) their relation is negatively and weakly correlated. And secondary data collection and correlation analysis proved that relation between affiliation reputation and uncitedness vary in different subjects. The findings of this study would attract scientists’ attention to avoid Matthew Effect and focus more on research papers rather than reputation when citing references.
Hypotheses of information‐seeking satisfaction gaps: Demographics, sources usage, and person‐source fit
Authors: Sin Sei‐Ching Joanna , Lee Chei Sian
Published: February 2016

Informed by the knowledge gap theory, this study explored possible hypotheses on information‐seeking satisfaction gaps. Using a survey of 1,000 Singapore Internet users and an ANOVA test, this research tested whether individuals’ satisfaction with everyday information seeking varies by demographics and by the frequency of information sources usage. Interaction effects were also tested. Significant differences were found in the satisfaction level based on the income level and on the frequency of using all four sources tested. Three interactions were significant, two of which suggest lower satisfaction among lower socioeconomic status individuals who used the Internet or social media with moderate frequency. Five propositions were introduced for further testing.
Envisioning how fair use and fair dealing might best facilitate scholarship
Authors: Caidi Nadia , Centivany Alissa , Samuelson Pam , Wolfe Michael
Published: February 2016

Copyright law grants exclusive rights to authors of original works of authorship, but those rights are subject to numerous exceptions and limitations, including fair use in the United States and fair dealing in Canada. These exceptions have traditionally worked to ensure that the rights of copyright owners are adequately balanced with the interests of subsequent authors, researchers, and consumers of copyrighted works. Moreover, fair use has emerged as the most promising legal mechanism for the digitization, preservation, and study of large collections of copyrighted work. Fair use and fair dealing provide much of the flexibility needed to ensure that copyright protection serves to facilitate scholarship rather than threaten it. Scholars encounter copyright law both as authors and as users of copyrighted works.

With an eye toward the future, this panel will examine the extent to which the discourses and practices of the past decade have contributed to shaping and reshaping our scholarly environment, how the information field has responded, and why and how information scholars, researchers and professionals ought to remain engaged in these matters in the future.
Using syntagmatic relations to examine semantic communities in user generated book reviews
Authors: Yoon Kyunghye , Bezdicek Adam
Published: February 2016

While several studies have suggested that implicit semantic communities can be identified within user generated content, the majority have focused on identifying these communities via networks of “tags” within folksonomies. This method can be problematic due to the lack of linguistic context inherent in tags as collections of discrete terms. This study attempted a different approach to this problem by analyzing a corpus of user generated reviews for popular science books taken from Amazon. It searched the reviews for patterns of shared core semantic meanings as constituted by syntagmatic relations between “topic” and “comment.” Preliminary results showed that (1) core semantic meanings expressed via “topic” and “comment” relations were salient across reviews for a given book and across books within the genre and (2) specific patterns of core semantic meanings suggested the presence of different user communities constituted through similar manners of commenting on the books. The results provide insight into the social ways that readers accumulate shared meaning around books through repetition, interpretation, annotation.
Health information use: Preliminary results from a systematic review
Authors: Fry Laura , Santos Yleana E. , Zhang Yan
Published: February 2016

Searching for health information online is a popular behavior, yet little is known about how people use the information they find. As an initial step towards understanding this important aspect of consumer health information behavior, we conducted a systematic review. We searched three major health‐related databases, CINAHL, Medline, and PsycINFO and identified 31 articles that report consumers’ use of health information found online. Thematic analysis of these articles revealed that the most common uses of online health information were to make health decisions and lifestyle changes, and to discuss the information with healthcare professionals.
Streamlining metadata for economic time series data: A project report
Authors: Podleski Genevieve
Published: February 2016

The macroeconomic data domain is complex, and the plethora of metadata practices and standards makes using and harmonizing datasets more difficult for researchers. This poster explains the impetus behind and the progress made in the first year of a cooperative project to improve and streamline metadata for economic time series data.
Feature selection on heterogeneous graph
Authors: Guo Chun , Liu Xiaozhong
Published: February 2016

Heterogeneous graph based information recommendation have been proved useful in recent studies. Given a heterogeneous graph scheme, there are many possible meta paths between the query node and the result node, and each meta path addresses a hypothesis‐based ranking function. In prior researches, meta paths are manually selected by domain experts. However, when the graph scheme becomes complex, this method can be inefficient. In this study, we propose feature generation tree, a novel feature selection method for heterogeneous graph mining based recommendation algorithms, which adds graph structure information into the original “feature selection for ranking” algorithm and saves a fair amount of time for feature computation. In our preliminary experiment, the proposed method outperforms the original “feature selection for ranking” algorithm in both efficiency and effectiveness.
Expanding an oil spill semantic relations taxonomy with a foreign policy semantic relations taxonomy
Authors: Wu Yejun , Yang Li
Published: February 2016

This paper presents the significance, method and findings of expanding an oil spill semantic relations taxonomy with the CAMEO foreign policy semantic relations taxonomy for supporting knowledge discovery. The oil spill relations taxonomy is enriched by integrating the CAMEO relations taxonomy. Context scope notes may need to be added to CAMEO relation terms (especially the polysemous terms) when they are merged into the oil spill relations taxonomy. A term may be classified into different categories due to different context.
Agnotology and information
Authors: Frazier T. Zachary
Published: February 2016

Agnotology was coined in an effort to create a title for a project to build an understanding of ignorance. The poster proposed seeks to re‐introduce ignorance to information science through the comparison of the construction of ignorance in agnotology and the construction of information in information science. Looking at the way that models of ignorance parallel models of information, a greater understanding of the epistemic landscape is revealed. This conversation around the theoretical foundations of information science posed by this proposal may have a direct impact on both individuals and information contexts by reducing entropy and uncertainty in information science research. This poster is a step towards starting a conversation about connections and overlaps between information science and agnotology.
Qualitative analysis of user experience in a 3D virtual environment
Authors: Geszten Dalma , Hámornik Balázs Péter , Komlodi Anita , Hercegfi Károly , Szabó Bálint , Young Alyson
Published: February 2016

This paper describes elements of user experience of a collaborative 3D immersive virtual information management environment. We detail those elements that are seen to both improve and deteriorate user experience, and provide design guidance for researchers and designers. We designed the 3D virtual environment in the Virtual Collaboration Arena (VirCA) collaborative space specifically to study the collaborative information retrieval and management behaviors of users. We conducted 117 interviews and then analyzed the data using a qualitative content analysis to identify the main elements of user experience. While participants generally reacted positively to the environment, they also mentioned a few distracting usability problems. Applying the results in the further development of VirCA can create a higher level of user experience and more effective collaboration.
Query‐centric scientific topic evolution extraction
Authors: Jensen Scott , Yu Yingying , Liu Hans B. , Liu Xiaozhong
Published: February 2016

Researchers in academia and industry face a deluge of data in our digital world. In this paper, we investigate a novel problem, query‐centric scientific topic evolution. Using heterogeneous graph mining techniques we construct a topic evolution tree (TET) from massive collections of scientific publications, enabling students and researchers to explore the foundation of research topics outside their specialization. Prior research has focused mainly on citation relationships; in this study we employed multiple types of relationships, including authorship, citation, publishing venue, and the contributions authors, papers, and venues have made to a specific topic. We examine multiple restricted meta‐paths in constructing a TET covering topics from the MeSH vocabulary for biomedical research.
Human values and personal health records
Authors: Fleischmann Kenneth R. , Zhang Yan , Xie Bo
Published: February 2016

Personal health records (PHRs) are on the rise in recent years. To understand why and how people use (or not use) PHRs, it is critical to understand what they value. This paper reports preliminary findings from a thematic analysis of journal articles related to PHRs. Our analysis identified six values with ethical import as being particularly salient to the use of personally identifiable information in this literature: privacy, confidentiality, security, transparency, trust, and human agency.
Authorship, Patents, Citations, Acknowledgments, Tweets, Reader Counts and the Multifaceted Reward System of Science
Authors: Desrochers Nadine , Bowman Timothy D. , Haustein Stefanie , Mongeon Philippe , Quan‐Haase Anabel , Paul‐Hus Adèle , Costas Rodrigo , Larivière Vincent , Pecoskie Jen , Tsou Andrew
Published: February 2016

Building upon well‐established paradigms brought forth by such theorists as Robert K. Merton, Pierre Bourdieu, and Blaise Cronin, the panel will span the full cycle of academic production to show, through various bibliometric measures and other quantitative and qualitative analyses, how the reward system of science is evolving. While there is strong evidence to suggest that such forms of dissemination as social media output and blogging are being incorporated into scientific practices, scientific impact still remains principally assessed using measures such as authorship and citations, whilst other elements, such as acknowledgements, have received varying levels of regard at various times. Disciplinary considerations also arise. Using a wide range of approaches, measures, and datasets, the panelists will establish links between their individual research to create an empirically driven picture of the reward system of science and its indicators. Through the use of the Polldaddy application, audience members will answer questions and create an overview of their perception of the reward system of science.
Needs analysis on the development of evidence‐based practice in an undergraduate problem‐based learning context
Authors: Allen Carla M. , Saparova Dinara
Published: February 2016

Evidence‐based practice (EBP) is a formal information behavior recently imposed on healthcare providers, which emphasizes the incorporation of the best research evidence into the delivery of patient care. Internationally, policies that require both healthcare practice and the educational environment under which health science students are educated to be evidence based are on the rise. In medical and health sciences curricula, EBP and problem‐based learning (PBL) are often seen as synonymous, as traditional medical PBL requires students to seek out research evidence related to posed clinical problems. However, students in an undergraduate radiography program exhibit difficulties in implementing EBP, despite successful completion of a PBL course. This study describes the findings of a needs analysis undertaken to better understand the issues hindering the development of effective evidence‐based decision making skills in the PBL context.
The nature of government tweets for conveying a message to the public
Authors: Bachstein Frances Nichols
Published: February 2016

Governments wish to keep certain types of information concealed from the public due to a variety of different reasons. Government agencies that protect secrecy often have a difficult time connecting to the public (WGPC, 2014). Secretive, or perceived secretive government organizations often fall into the nebulous realm of uncertainty for the information consumer. This results in a great deal of misinformation and disinformation being thought of as correct (Hernon,). These types of wrong information are ubiquitous on the internet and even more so on social media, where rumors are often passed as truth. Since 2008, the US government is moving toward a more transparent, open, and easily accessed information base through social media (Lathrop & Ruma,). Agencies across the government are adopting types of social media communication. However, bureaus that primarily focus on security and safeguarding secrets struggle with how much to share and which platforms of social media are the ‘best’ for their message, and how to inure trust from their audience. This study is a content analysis of parent tweets from government agencies of the Central Intelligence Agency, Federal Bureau of Investigation, Department of Homeland Security, International Atomic Energy Agency, and National Security Agency (CIA, FBI, DHS, IAEA, and NSA) and the responses of the tweets from the public to assess the tone of message and response.