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Hong, Eunpyo,Kim, Taewoo,Lee, Seon-Hong,Lee, Jung Woo,Lee, Heesoo Elsevier 2019 CERAMICS INTERNATIONAL Vol.45 No.7
<P><B>Abstract</B></P> <P>The hardnesses of carbon-doped TiMeN (Me = Zr, Al, and Cr) coatings were investigated in terms of lattice distortion and residual stress according to the difference in the ionic radii of the transition metal. TiMeN coatings were deposited on SUS304 by sputtering, and laser carburization was carried out for carbon doping. The scratch test showed that the delaminations of TiZrN, TiAlN, and TiCrN coatings were occurred about 13 N, 19 N, and, 16 N before and after carbon doping. The rate of hardness increase rate of TiZrN with carbon doping was the highest at 15.1%, and that of TiAlN and TiCrN were at 8.8% and 10.7%, respectively. The difference in hardness was analyzed by Rietveld refinement using HR-XRD, and the change in the lattice constant for TiZrN was 0.18 Å, which was larger than that of TiAlN (0.10 Å) and TiCrN (0.07 Å). The expansion distortion was confirmed by the increase in lattice constant, and the doped carbon affected the lattice distortion differently depending on the ionic radius of the transition metal. The variation in residual stress through the lattice distortion was identified by the sin<SUP>2</SUP>Ψ method using HR-XRD with parallel beam and tilting of the specimen. The TiZrN coating showed the largest residual stress variation at 22%, and TiAlN and TiCrN showed similar tendencies at 11% and 13%, respectively.</P>
<i>In situ</i> fabrication of freestanding single‐walled carbon nanotube rope interconnection
Kim, Taewoo,Kang, Tae June,Seo, Dong Kyun,Jang, Eui Yun,Jin, Kyoung Cheol,Choi, Ajeong,Kim, Dae‐,Weon,Park, Yung Woo,Jeong, Dae Hong,Kim, Yong Hyup WILEY‐VCH Verlag 2012 Physica status solidi. PSS. A, Applications and ma Vol.209 No.11
<P><B>Abstract</B></P><P>A single‐walled carbon nanotube rope interconnect is fabricated by utilizing dielectrophoresis and capillary condensation. The rope connects a pair of prefabricated cantilevers with good alignment and outstanding packing density. The diameter and resistance of the rope are readily controlled by adjusting the dielectrophoresis parameters such as applied voltage and frequency. The properties of the rope, including packing density, electron transport, and maximum current density, are investigated. The maximum current density of the rope is measured to be as high as 1 × 10<SUP>7</SUP> A/cm<SUP>2</SUP> in vacuum. </P>
소형 화물 차량의 적재량이 가속 주행 시의 연비 및 오염물질 배출에 미치는 영향
이태우(Taewoo Lee),길지훈(Jihoon Keel),전상진(Sangjin Jeon),박준홍(Junhong Park),이종태(Jongtae Lee),홍지형(Jihyung Hong) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.2
The effect of payload on fuel consumption and emission of light duty freight truck during acceleration driving has been analyzed. Running tests were carried out with various payload conditions on chassis dynamometer. A typical driving pattern for urban cities was used. Real time emission measurement systems for gaseous and soot emission were utilized to investigate the real time dynamic of fuel use and exhaust emissions. It was observed that fuel use and pollutant emissions were increased as payload was increased. Under the same payload condition, the increased amount of acceleration driving is much higher than that of steady state driving. The results demonstrated the advantages of eco-driving, which is an environmentally friendly driving manner, could be emphasized in heavier payload condition. Inertial tractive power was introduced for considering the parameters affecting emission during acceleration driving, which are speed, acceleration and payload. Fuel use and emission in various driving conditions were expressed as functions of inertial tractive power. The estimated result by these functions well predicted measured result within 10% deviation.
Kim, Taewoo,Jeon, Sangheon,Lone, Saifullah,Doh, Song Jun,Shin, Dong-Myeong,Kim, Hyung Kook,Hwang, Yoon-Hwae,Hong, Suck Won Elsevier 2018 Nano energy Vol.54 No.-
<P><B>Abstract</B></P> <P>The ongoing expedition to harvest ambient renewable energies from the environment by wearable fabric-based nanogenerators is a promising route to sustainably drive the small electronics with unprecedented opportunities in next-generation self-powered devices. Here, we report a simple method to fabricate a washable, breathable and wearable triboelectric nanogenerator that harvests the energy of triboelectricity through an enhanced friction surface area made of the gold nanodot-pattern crafted by electron-beam sputtering on an inexpensive polyurethane surface. The gold deposition which crops-up as regular small islands, under oxygen plasma is subsequently, etched into nanodot-pattern on a polyurethane surface to convert mechanical energy into an electrical signal via in-plane sliding mode with a maximum output of ~2 μW. The nanodot engineering plays an important role to improve the active sliding frictional area, as well as the corresponding output-performance of the triboelectric nanogenerator. To demonstrate the potential applications of our approach, we designed a self-powered wearable device integrated with clothes to harvest different kinds of mechanical energies from the human motion. To elevate the power output-performance, we fabricated waterproof fiber with flutter membrane and quantified triboelectric charge against airflow speed. At mild wind speed, the fabricated triboelectric nanogenerator shows a maximum output of 70 µW. Besides, as an example of practical application, the nanogenerator constructed can produce an improved capacitor charge voltage to drive dozens of light-emitting diodes and apply them to low power consumption devices. This technology is produced in a simple and cost-effective manner and reports an easy way to produce an energy harvesting system based on triboelectric effects using a sustainable and renewable energy source of body motions and air flows. This system is expected to be one of the best green energy sources for portable and wearable electronic devices in the near future.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The harvest of the triboelectric energy is accomplished by increasing the surface area through nanodot-patterned arrays formed on a woven fabric surface. </LI> <LI> Wearable triboelectric nanogenerators for a self-powered energy-supply by attaching it onto sportswear to harvest the energy, collected from the motion of the human body. </LI> <LI> Adapting a textile-based fluttering membrane to synergistically combine aerodynamic movement enables dramatic improvements in the electrical output of the triboelectric nanogenerator. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Synthesis of a Carbonaceous Two-Dimensional Material
Kim, Taewoo,Lee, Junho,Lee, Geonhui,Lee, Jaewoo,Song, Hyelynn,Jho, Jae Young,Lee, Hong H.,Kim, Yong Hyup American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.24
<P>Despite tremendous accomplishments achieved in 2D materials, little progress has been made in carbonaceous 2D materials beyond graphene and graphene oxide. Here, we report a 2D material of carbonaceous nanoplates (CANP). The bottom-up synthesis of CANP is green, separation-free, and massive. The nanoplates are 2 to 3 monolayers thick with an average interlayer spacing of 0.57 nm. The synthesis involves viscosity-aided two-dimensional growth of fragmented glucose derivatives and leads to the complete conversion of glucose to the 2D nanoplates. Application tests demonstrate the usefulness of the affordable 2D material.</P> [FIG OMISSION]</BR>
도로 주행 중의 비출력 및 가속도 조건을 반영한 차속별 배출계수 연구
이태우(Taewoo Lee),길지훈(Jihoon Keel),박준홍(Junhong Park),박용희(Yonghee Park),홍지형(Jihyung Hong),이대엽(Daeyup Lee) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.1
The performance of emission factor has been validated by comparison with on-road test data. Emission factor, which is a function of vehicle speed, has been acquired based on chassis dynamometer test with NIER driving pattern. Portable Emission Measurement System, PEMS has measured on-road emission. Test vehicle was operated on defined test routes under different driving conditions, and made ten trips along its route. Emission factors properly simulate on-road test result, although there is some drawback to consider variety of driving condition on real world. Vehicle specific power and acceleration have been used to explain the distributed on-road result within same vehicle speed range. The trend in carbon dioxide and nitrogen oxide emission with respect to specific power and acceleration is clear. It has been found that specific power is a good explanatory variable for microscopic analysis for modal test result. Acceleration is good for microscopic as well as macroscopic analysis.
주행패턴의 상대 가속도에 따른 중소형 자동차의 온실가스 및 대기오염물질 배출 특성
이태우(Taewoo Lee),길지훈(Jihoon Keel),박경균(Kyungkyun Park),박준홍(Junhong Park),박용희(Yonghee Park),홍지형(Jihyung Hong),이대엽(Daeyup Lee) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.4
Although driving patterns strongly influence greenhouse gas and air pollutant emission rate from light duty vehicles, emission measurements have been mainly based on chassis dynamometer testing with one standard driving pattern. And there has been limited work on quantifying the independent effect of driving parameters on emission rate because of multidimensional nature of real-world driving pattern. The objective of this study is to obtain the quantitative effect of relative positive acceleration (RPA) on vehicle emission rate. RPA has been used to define the occurrence of acceleration demanding large amounts of power in certain driving distance and shown to be a significant affecting parameter for real-world emission rate. 40 driving patterns have been developed with fixed driving parameters to investigate independent effect of RPA. For the same values of average vehicle speed and power, the trend in carbon dioxide emission rate and fuel consumption with respect to RPA is very clear. Emission rate of nitrogen oxide and particulate matter also increase with respect to RPA, but the trend is less clear. Carbon dioxide emission from diesel vehicle appear to be more affected by high accelerations compared to that from gasoline vehicle because of high intake air restriction during acceleration caused by turbocharger and intercooler. The results have implications for the possible reduction of environmental effects through better traffic planning and management, driver education and car design.