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8월 둘째주 Weekly Article에서는 오랜 명성과 신뢰를 가진 Nature Publishing Group의 대표적인 OA 저널 23종을 소개합니다. 투고 저널을 고를 때 가장 궁금하지만 일일이 확인하기는 귀찮은(!) 최신 IF와 연구분야 카테고리, 랭킹 정보도 함께 정리해 엑셀 파일로 공유하니 참고하세요.
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Nature Publishing Group의 OA 저널

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NPG High Impact OA Journals

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NPG의 OA 저널들 중 JCR(Journal Citation Reports)에서 2017년 IF(Impact Factor) 분야별 랭킹이 Q1~2(상위 50%)인 저널 23종의 분야 카테고리와 저널 지표를 한 눈에 확인할 수 있도록 엑셀 파일로 정리했습니다.

DGIST의 연구자들이 즐겨 출판하는 저널 2종과 연구데이터를 출판할 수 있는 "Scientific Data"는 따로 소개하니, 홈페이지를 방문해보세요!

NatureCommunications

Aims & Scope

 Nature Communications is an open access, multidisciplinary journal dedicated to publishing high-quality research in all areas of the biological, physical, chemical and Earth sciences. Papers published by the journal aim to represent important advances of significance to specialists within each field.

 ▶ Nature Communications에 투고하기

Scientific Data

Aims & Scope

Scientific Data is a peer-reviewed, open-access journal for descriptions of scientifically valuable datasets, and research that advances the sharing and reuse of scientific data. We aim to promote wider data sharing and reuse, and to credit those that share.

▶ Find out more about the key principles that drive Scientific Data

Scientific Reports

Aims & Scope

 Scientific Reports publishes original research in all areas of the natural and clinical sciences. We believe that if your research is scientifically valid and technically sound then it deserves to be published and made accessible to the research community.

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▶ Scientific Reports - at a glance

8월 2주 DGIST Scholar 신규 업데이트 논문

최창순 연구원

[Featured OA Article] Biscrolled Carbon Nanotube Yarn StructuredSilver-Zinc Battery

http://hdl.handle.net/20.500.11750/9072

 

Authors  Lee, Jae Myeong; Choi, Changsoon; Kim, Ji Hwan; de Andrade, Monica Jung; Baughman, Ray H.; Kim, Seon Jeong

 

Citation  Scientific Reports, 8

 

Abstract

Flexible yarn- or fiber-based energy storing devices are attractive because of their small dimension, light weight, and suitability for integration into woven or textile application. Some Li-ion based yarn or fiber batteries were developed due to their performance advantages, realizing highly performing and practically safe wearable battery still remains a challenge. Here, high performance and safe yarn-based battery is demonstrated by embedding active materials into inner structure of yarn and using water based electrolyte. Thanks to biscrolling method, loading level of silver and zinc in yarn electrodes increased up to 99 wt%. Our high loaded Silver and Zinc yarn electrodes enables high linear capacity in liquid electrolyte (0.285 mAh/cm) and solid electrolyte (0.276 mAh/cm), which are significantly higher than previously reported fiber batteries. In additions, due to PVA-KOH based aqueous electrolyte, our yarn battery system is inflammable, non-explosive and safe. Consequently, these high-capacities enable our Silver-Zinc aqueous yarn battery to be applicable to the energy source of portable and wearable electronics like an electric watch. © 2018, The Author(s).

양기정 & 김대환 & 강진규 연구원

The alterations of carrier separation in kesteritesolar cells

http://hdl.handle.net/20.500.11750/9074

 

Authors  Yang, Kee Jeong; Kim, Sam Mi; Sim, Jun Hyoung; Son, Dae Ho; Kim, Dae-Hwan; Kim, Juran; Jo, William; Yoo, Hye Sun; Kim, Jun Ho; Kang, Jin-Kyu

 

Citation  Nano Energy, 52, 38-53

Abstract

Cu2ZnSn(S,Se)S4(CZTSSe) thin films have attracted attention as low-cost absorber materials forsolar cells; however, further studies are required to develop flexible solarcells from this material and to achieve a high power conversion efficiency.Toward this objective, this work investigated eight types of precursors appliedon flexible Mo foil substrates, some of which also contained a layer of NaF.Secondary phases, defects, and defect clusters were different in the varioussamples, and the surface electrical characteristics of the CZTSSe absorberlayer varied accordingly. In contrast to those in the CIGS-based cells, defectsand defect clusters generated in the CZTSSe absorber layer caused an upwardband bending-like band structure to form at the grain boundaries (GBs), therebyforming an intra-grain (IG) current path. By improving carrier separation, aflexible CZTSSe thin-film solar cell was developed on a Mo foil substrate witha power conversion efficiency of 7.04%. Thus, the efficiency of CZTSSethin-film solar cells could be increased through carrier separation measuresthat enabled the collection of holes toward the GBs and of electrons towardIGs. © 2018 Elsevier Ltd

장윤희 교수

Correlational Effects of the Molecular-TiltConfiguration and the Intermolecular van der Waals Interaction on the ChargeTransport in the Molecular Junction

http://hdl.handle.net/20.500.11750/9067 


Authors  Shin, Jae Ho; Gu, Kyung Yeol; Yang, Seung Hoon; Lee, Chul-Ho; Lee, Tak Hee; Jang, Yun Hee; Wang, Gun Uk

 

Citation  Nano Letters, 18(7), 4322-4330

 

Abstract

Molecular conformation, intermolecular interaction, and electrode-molecule contacts greatly affect charge transport in molecular junctions and interfacial properties of organic devices by controlling the molecular orbital alignment. Here, we statistically investigated the charge transport in molecular junctions containing self-assembled oligophenylene molecules sandwiched between an Au probe tip and graphene according to various tip-loading forces (FL) that can control the molecular-tilt configuration and the van der Waals (vdW) interactions. In particular, the molecular junctions exhibited two distinct transport regimes according to the FL dependence (i.e., FL-dependent and FL-independent tunneling regimes). In addition, the charge-injection tunneling barriers at the junction interfaces are differently changed when the FL ≤ 20 nN. These features are associated to the correlation effects between the asymmetry-coupling factor (η), the molecular-tilt angle (θ), and the repulsive intermolecular vdW force (FvdW) on the molecular-tunneling barriers. A more-comprehensive understanding of these charge transport properties was thoroughly developed based on the density functional theory calculations in consideration of the molecular-tilt configuration and the repulsive vdW force between molecules. © 2018 American Chemical Society.

남홍길 교수

A missense allele of KARRIKIN-INSENSITIVE2 impairsligand-binding and downstream signaling in Arabidopsis thaliana

http://hdl.handle.net/20.500.11750/9071

 

Authors  Lee, In Hye; Kim, Kug Lae; Lee, Su Min; Lee, Seung Jun; Hwang, Eun Jin; Shin, Ki Hye; Kim, Da Young; Choi, Jung Ki; Choi, Hyun Mo; Cha, Jeong Seok; Kim, Ho Young; Lee, Rin A; Jeong, Su Yeong; Kim, Jeong Sik; Kim, Yu Mi; Nam, Hong Gil; Park, Soon Ki; Cho, Hyun Soo; Soh, Moon Soo

 

Citation  Journal of Experimental Botany, 69(15), 3609-3623

 

Abstract

A smoke-derived compound, karrikin (KAR), and an endogenous but as yet unidentified KARRIKIN INSENSITIVE2 (KAI2) ligand (KL) have been identified as chemical cues in higher plants that impact on multiple aspects of growth and development. Genetic screening of light-signaling mutants in Arabidopsis thaliana has identified a mutant designated as ply2 (pleiotropic long hypocotyl2) that has pleiotropic light-response defects. In this study, we used positional cloning to identify the molecular lesion of ply2 as a missense mutation of KAI2/HYPOSENSITIVE TO LIGHT, which causes a single amino acid substitution, Ala219Val. Physiological analysis and genetic epistasis analysis with the KL-signaling components MORE AXILLARY GROWTH2 (MAX2) and SUPPRESSOR OF MAX2 1 suggested that the pleiotropic phenotypes of the ply2 mutant can be ascribed to a defect in KL-signaling. Molecular and biochemical analyses revealed that the mutant KAI2 ply2 protein is impaired in its ligand-binding activity. In support of this conclusion, X-ray crystallography studies suggested that the KAI2 ply2 mutation not only results in a narrowed entrance gate for the ligand but also alters the structural flexibility of the helical lid domains. We discuss the structural implications of the Ala219 residue with regard to ligand-specific binding and signaling of KAI2, together with potential functions of KL-signaling in the context of the light-regulatory network in Arabidopsis thaliana. © The Author(s) 2018. Published by Oxford University Press on behalf of the Society for Experimental Biology.

임성준 연구원

Structural Contributionsto Hydrodynamic Diameter for Quantum Dots Optimized for Live-CellSingle-Molecule Tracking

http://hdl.handle.net/20.500.11750/9065

Authors  Sheung, Janet Y.; Ge, Pinghua; Lim, Sung Jun; Lee, Sang Hak; Smith, Andrew M.; Selvin, Paul R.

 

Citation  Journal of Physical Chemistry C, 122(30), 17406-17412

 

Abstract

Quantum dots are fluorescent nanoparticles with narrow-band, size-tunable, and long-lasting emission. Typical formulations used for imaging proteins in cells are hydrodynamically much larger than the protein targets, so it is critical to assess the impact of steric effects deriving from hydrodynamic size. This report analyzes a new class of quantum dots that have been engineered for minimized size specifically for imaging receptors in narrow synaptic junctions between neurons. We use fluorescence correlation spectroscopy and transmission electron microscopy to calculate the contributions of the crystalline core, organic coating, and targeting proteins (streptavidin) to the total hydrodynamic diameter of the probe, using a wide range of core materials with emission spanning 545-705 nm. We find the contributing thickness of standard commercial amphiphilic polymers to be ∼8 to ∼14 nm, whereas coatings based on the compact ligand HS-(CH2)11-(OCH2CH2)4-OH contribute ∼6 to ∼9 nm, reducing the diameter by ∼2 to ∼5 nm, depending on core size. When the number of streptavidins for protein targeting is minimized, the total diameter can be further reduced by ∼5 to ∼11 nm, yielding a diameter of 13.8-18.4 nm. These findings explain why access to the narrow synapse derive primarily from the protein functionalization of commercial variants, rather than the organic coating layers. They also explain why those quantum dots with size around 14 nm with only a few streptavidins can access narrow cellular structures for neuronal labeling, whereas those >27 nm and a large number of streptavidins, cannot. © 2018 American Chemical Society.

은용순&최지웅 교수

Decoy Signal Based Strategic Beamforming AgainstHigh-Power Reactive Jamming

http://hdl.handle.net/20.500.11750/9063

 

Authors  Lim, Sung Ho; Han, Sungmin; Lee, Jae Seok; Eun, Yongsoon; Choi, Ji-Woong

 

Citation  IEEE Transactions on Vehicular Technology

 

Abstract

Arraybeamforming (BF) has received considerable attention as a means of anti-jamming(AJ) by combining desired signals constructively and jamming signalsdestructively. However, even with BF, the state-of-the-art reactive jammer (RJ)can easily detect the target channels from the leakage of the transmit powerand concentrate its own power to the detected band to degrade communicationperformance. In this paper, we attempt to mitigate this problem by exploitingfake information, the so-called decoy signal, and proper BF at the transmitterand the receiver, and show that it is possible to deceive the RJ intoallocating a large portion of its own power to the decoy signal. In thisregard, we attempt to maximize the signal-to-jamming-plus-noise power ratio(SJNR) at the receiver and the signal-to-leakage power ratio (SLR) at thetransmitter by optimizing the BF strategy. Through numerical simulationsmeasuring the SJNR and the channel capacity, we demonstrate the effectivenessof the proposed BF scheme, especially in high-power RJ environments. IEEE

이상임 교수

Evidence for personality conformity, not socialniche specialization in social jays

http://hdl.handle.net/20.500.11750/9066

 

Authors  McCune, Kelsey; Jablonski, Piotr; Lee, Sang-im; Ha, Renee

 

Citation  Behavioral Ecology, 29(4), 910-917

 

Abstract

Animal personality traits are defined as consistent individual differences in behavior over time and across contexts. Occasionally this inflexibility results in maladaptive behavioral responses to external stimuli. However, in social groups inflexible behavioral phenotypes might be favored as this could lead to more predictable social interactions. Two hypotheses seek to describe the optimal distribution of personality types within groups. The social niche specialization hypothesis states that individuals within groups should partition social roles, like personality types, to avoid conflict; whereas the conformity hypothesis states that individuals should assort with conspecifics of similar personality. However, no research so far has compared these hypotheses using data from wild animal systems. We tested boldness in the wild on 2 species with different social systems, the Mexican Jay and California Scrub-Jay. We found support for the conformity hypothesis over the social niche specialization hypothesis because individuals within groups of the social species had more similar personalities, and consequently there was a statistically significant group effect. The most likely mechanism for this conformity is social learning of behaviors through development, but more explicit research on this is needed. © The Author(s) 2018.

홍재성 교수

The Dimensionless Squared Jerk: An ObjectiveParameter That Improves Assessment of Hand Motion Analysis during SimulatedShoulder Arthroscopy

http://hdl.handle.net/20.500.11750/9075

 

Authors  Kholinne, Erica; Gandhi, Maulik J.; Adikrishna, Arnold; Hong, Han Pyo; Kim, Hae Won; Hong, Jaesung; Jeon, In Ho

 

Citation  BioMed Research International, 2018

 

Abstract

Purpose. Attempts to quantify hand movements of surgeons during arthroscopic surgery faced limited progress beyond motion analysis of hands and/or instruments. Surrogate markers such as procedure time have been used. The dimensionless squared jerk (DSJ) is a measure of deliberate hand movements. This study tests the ability of DSJ to differentiate novice and expert surgeons (construct validity) whilst performing simulated arthroscopic shoulder surgical tasks. Methods. Six residents (novice group) and six consultants (expert group) participated in this study. Participants performed three validated tasks sequentially under the same experimental setup (one performance). Each participant had ten performances assessed. Hand movements were recorded with optical tracking system. The DSJ, time taken, total path length, multiple measures of acceleration, and number of movements were recorded. Results. There were significant differences between novices and experts when assessed using time, number of movements with average and minimal acceleration threshold, and DSJ. No significant differences were observed in maximum acceleration, total path length, and number of movements with 10m/s2 acceleration threshold. Conclusion. DSJ is an objective parameter that can differentiate novice and expert surgeons' simulated arthroscopic performances. We propose DSJ as an adjunct to more conventional parameters for arthroscopic surgery skills assessment. © 2018 Erica Kholinne et al.

권혁준 & 장재은 교수

Single pass laser process for super-hydrophobic flexible surfaces with micro/nano hierarchical structures

http://hdl.handle.net/20.500.11750/9069


Authors  Kwon, Hyuk Jun; Yeo, Jun Yeob; Jang, Jae Eun; Grigoropoulos, Costas P.; Yoo, Jae Hyuck

 

Citation  Materials, 11(7)

 

Abstract

Wettinghas been studied in various fields: chemical industry, automobilemanufacturing, food companies, and even life sciences. In these studies,super-hydrophobic surfaces have been achieved through complex steps andprocesses. To realize super-hydrophobicity, however, we demonstrated a simpleand single pass laser process for the fabrication of micro/nano hierarchicalstructures on the flexible polytetrafluoroethylene (PTFE, Teflon) surface. Thefabricated hierarchical structures helped increase the hydrophobicity byaugmenting the surface roughness and promoting air-trapping. In addition, weemployed a low-cost and high-throughput replication process producing numerouspolydimethylsiloxane (PDMS) replicas from the laser-processed PTFE film. Thanksto the anti-adhesive characteristics of PTFE and the elasticity of PDMS, thestructure perfectly transferred to the replica without any mechanical failure.Moreover, our designed mesh patterns offered the possibility of large areaapplications through varying the process parameters (pitch, beam spot size,laser fluence, and scan speed). Even though mesh patterns had relatively largepitch (190 μm), we were able to achieve highcontact angle (> 150°). Through pneumaticallydeformed structure, we clearly showed that the shape of the droplets on ourlaser-processed super-hydrophobic surface was spherical. Based on theseoutcomes, we can expect our single laser pulse exposure process can overcomemany drawbacks and offer opportunities for advancing applications of thewetting phenomena. © 2018 by the authors.

김동환 & 김참 & 김호영 연구원

Method for evaluating interfacial resistances ofthermoelectric devices using I-V measurement

http://hdl.handle.net/20.500.11750/9064 


Authors  Kim, Dong Hwan; Kim, Cham; Kim, Jong Tae; Yoon, Duck Ki; Kim, Ho Young

 

Citation  Measurement: Journal of the International Measurement Confederation, 129, 281-287

 

Abstract

Research on the methodology for predicting and analyzing the performance of a thermoelectric device (TED) can offer various possibilities for enhancing its energy conversion characteristics. In this work, the methodology to determine the electrical contact resistance and the interfacial thermal resistance of a TED was studied. Based on one-dimensional heat transfer equations of power generation mode that includes electrical contact resistance and interfacial thermal resistance, we derived explicit expressions for the open circuit voltage and the short circuit current as the limiting cases of the external electrical load. The measurements of the open circuit voltage and the short-circuit current of TED were carried out for various thermal interface materials (TIMs) between the TED and heat reservoirs under varying compressive forces. The electrical contact resistance and the interfacial thermal resistance of a TED were determined by matching the measured values of the open circuit voltage and the short circuit current of a TED to the results of the analytic model. The electrical contact resistivity of the TED tested was approximately 3 × 109 Ωm2, irrespective of the compressive force, the hot-side temperature, and the TIMs. The interfacial thermal resistance varied sensitively with the TIMs and decreased with the compressive forces. © 2018 Elsevier Ltd

윤진효 연구원

The Effect of Open Innovation on Technology Valueand Technology Transfer: A Comparative Analysis of the Automotive, Robotics,and Aviation Industries of Korea

http://hdl.handle.net/20.500.11750/9073

 

Authors  Yun, Jinhyo Joseph; Jeong, Eui Seob; Lee, Young Kyu; Kim, Kyung Hun

 

Citation  Sustainability, 10(7), 1-16

 

Abstract

With the advent of the Fourth Industrial Revolution, the Korean industrial environment has been rapidly changing. As a result, several industries are facing different innovation conditions, including: the automotive industry, which is a traditional manufacturing industry in Korea; the aerospace industry, which has been vertically integrated, and has been led by a single large company-Korea Aerospace Industries-since Korea went through an economic crisis in the 1990s; and the robotics industry, which is currently emerging. This study used parameters related to patents originating from the automobile, robotics, and aerospace fields. The patents subjected to analysis were those registered in Korea from 2001 to 2014, and included those that were applied for, jointly applied for, or registered by Korean companies. This study analyzed the differences caused by the effect of open innovation in the three industries. According to our results, first, the three industries experienced different effects of open innovation. Second, when large companies controlled a given industry, open innovation either worked a little or did not work at all. According to this research result, the Korean robotics industry, which has a weak dominance of large companies, experienced a strong effect of open innovation, in that joint patent applications led to economic gains from the patents and an increase in technology transfer and technology value. The aerospace industry of Korea, which has the highest dominance of large companies, experienced a slight effect of open innovation, as the effect of joint patent application only improved the technology value. Finally, the automotive industry of Korea had an intermediate level of open innovation, between the aerospace and robotics sectors. © 2018 by the authors.

김영덕 연구원

Smart disaster response in vehicular tunnels:Technologies for search and rescue applications

http://hdl.handle.net/20.500.11750/9070

 

Authors  Kim, Young Duk; Son, Guk Jin; Kim, Hee Kang; Song, Chan Ho; Lee, Ji Hee

 

Citation  Sustainability, 10(7)

 

Abstract

Recently,the number of tunnels is increasing due to urbanization, and fire accidents intunnels are likewise increasing. In particular, in a long tunnel of more than 1km it is very difficult to track the exact location of a fire, accidentvehicles, and the fire brigade, as well as whether a fire occurred. In this paper,we analyze various types of accidents that may occur in tunnel fires andpropose detection, search, and rescue techniques to cope with them. For earlydetection of accidents, we propose various sensors using Internet of Things(IoT) technology and sensor networks to connect them. These sensors can detectnot only a fire but also the position of the vehicle in which the fire isoccurring in real time. We also propose a robotic system and operationtechnique that can be controlled by a fire fighter for more precise searchoperation. For rescue procedures, localization and tracking technology for firefighters and robots is proposed. Finally, the efficiency of the proposed systemwas verified through actual performance tests, including simulations of actualplacement and operation in tunnels. Through the construction of the equipmentin an actual tunnel 1.9 km long, we show that the proposed system is goodenough to cope with fire accidents, in terms of the delivery ratio of thecollected data, fire recognition ratio, localization accuracy, and responsedelay. © 2018 by the authors.

이상임 교수

Directional raids by army ants as an adaption topatchily distributed food: a simulation model

http://hdl.handle.net/20.500.11750/9061

 

Authors  Song, Won Cheol; Kim, Ho Young; Lee, Sang-im; Jablonski, Piotr G.

 

Citation  Animal Cells and Systems, 1-6

 

Abstract

A typical colony of Neotropical army ants (subfamily Ecitoninae) regularly raids a large area around their bivouac by forming a narrow directional column that can reach up to one hundred meters in length. The raid is finished and then relaunched 12–17 times, each time toward different orientation. After completing all bouts the colony relocates to a new area. A hypothetical alternative to this foraging mode is raiding radially and symmetrically by expanding the search front in every direction like a circular bubble. Using an existing agent-based modeling software that simulates army ants’ behavior, we compared the two possible modes of foraging in different food distributions. Regardless of the food patch abundance, the radial raiding was superior to the directional raiding when food patches had low quality, and the directional raiding was favorable when the patches were rich. In terms of energy efficiency, the radial raiding was the better strategy in a wide range of conditions. In contrast, the directional raiding tended to yield more food per coverage area. Based on our model, we suggest that the directional raiding by army ants is an adaptation to the habitats with abundance of high-quality food patches. This conclusion fits well with the ecology of army ants. © 2018 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group

Conference Paper

이정협 교수

A neural recording amplifier based on adaptive SNRoptimization technique for long-term implantation

http://hdl.handle.net/20.500.11750/9076

 

Authors  Lee, Taeju; Jang, Doojin.; Jung, Yoontae; Jeon, Hyuntak; Hong, Soonyoung; Han, Sungmin; Chu, Jun-Uk; Lee, Junghyup; Je, Minkyu

 

Citation  2017 IEEE Biomedical Circuits and Systems Conference, BioCAS 2017, 1-4

 

Abstract

Long-term neural recording which can consistently provide good signal-to-noise ratio (SNR) performance over time is important for stable operation of neuroprosthetic systems. This paper presents an analysis for the SNR optimization in a changing environment which causes variations in the tissue-electrode impedance, Zte. Based on the analysis result, a neural recording amplifier (NRA) is developed employing the SNR optimization technique. The NRA can adaptively change its configuration for in situ SNR optimization. The SNR is improved by 4.69% to 23.33% as Zte changes from 1.59 MQ to 31.8 MQ at 1 kHz. The NRA is fabricated in a 0.18-μm standard CMOS process and operates at 1.8-V supply while consuming 1.6 μA It achieves an input-referred noise of 4.67 μVrms when integrated from 1 Hz to 10 kHz, which leads to the NEF of 2.27 and the NEF2VDD of 9.28. The frequency reponse is measured with a high-pass cutoff frequency of 1 Hz and a low-pass cutoff frequency of 10 kHz. The midband gain is set to 40 dB while occupying 0.11 mm2 of a chip area. © 2017 IEEE.

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