http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
High Precision Measurement of 3D Profile Using Confocal Differential Heterodyne Interferometer
Kim Taejoong,Lee SeungWoo,Gweon Dae-Gab Optical Society of Korea 2005 Current Optics and Photonics Vol.9 No.1
The differential heterodyne interferometer (DHI) is suitable for precise measurement of step height and line width, since its differential configuration can significantly reduce disturbances from the environment [1,2]. Like most phase measuring interferometers, however, the DHI is limited, in that it can obtain only the phase from 0 to 2π, because of the sinusoidal nature of the optical interference involved. Thus, the measurable step height is limited to one quarter of the wavelength of the light source. This study describes a confocal differential heterodyne interferometer (CDHI) for measuring step heights of several micrometers, with a high resolution and line width with high repeatability. The CDHI has a simple structure and rapid measurement speed.
빛과 시간에 대한 사진적 연구 - 사진작품 < Foresta > 연작을 중심으로 -
김태중 ( Kim Taejoong ),천경우 ( Chun Kyungwoo ) 한국사진학회 2021 AURA Vol.- No.47
The series of the < Foresta > is a photograph work by the writer combining photographs and installation including the < Foresta - quasi a due > and < Foresta - reverse >. This research aims to study the notions of light and time prompted in the process of working on the < Foresta > series which takes a dark forest of an environment of specific light conditions as a subject matter. The unique photographing method of emitting the large amount of low light running behind the tripod as leaving the shutter open was required in order to realize minutely scattering lights in the dark forest. This act of moving and shooting light is a basic element of the works, leading to the questions as to the light and time. A series of < Foresta > an outcome of the concern and experiment regarding the medium of photography. The < Foresta - reverse > and < Foresta - quasi a due > attempted to work with different media are also drawn from the processes of researching the light and time. Through this research, it is expected to see the new examination that the photography with a great diversity of potentiality will acquire not only as a contemporary art but also as a theory of photography.
Lee, Kanghyeon,Yang, Gene Jaehyoung,Kim, Hackyeon,Kim, Taejoong,Lee, Sun Sook,Choi, Si-Young,Choi, Sungho,Kim, Yongseon Elsevier Sequoia 2017 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>The coating effects of electronically and ionically conductive materials on the surface of LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> (LNMO) cathodes for Li-ion batteries are examined. In order for the coating layers to promote facile electrochemical reactions, in addition to their protective functions of blocking side reactions between the LNMO surface and the electrolyte, carbon and Li<SUB>2</SUB>O–2B<SUB>2</SUB>O<SUB>3</SUB> (LBO), which conduct electrons and Li ions, respectively, are chosen as coating materials. The properties of the LBO–carbon composite coating are examined in comparison with those of carbon- or LBO-only coatings. Electrochemical metrics, such as discharge capacity, rate performance, and cyclability, are improved with the addition of the thin-film coatings. The LBO–carbon coating shows the best overall properties, particularly greatly improved capacity retention under elevated-temperature (60 °C) cycling. The multi-conductive feature of LBO–carbon for both electrons and Li ions provides stable electrochemical kinetics under conditions of severe side reactions at elevated temperatures. The proposed simple one-step aqueous process for forming and applying the composite electrode coating may be extended to other materials and the mass production thereof.</P> <P><B>Highlights</B></P> <P> <UL> <LI> LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> cathode is coated with a multi-conductive composite film of LBO and C. </LI> <LI> The elevated-temperature cyclability greatly improves with the LBO–C coating. </LI> <LI> The capacity and rate performance are improved by coating the cathode. </LI> <LI> A cheap and easily scalable process for cathode coating is designed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Taejoong Wang,Jung Ho Kim 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.4
In this study, NOx conversion characteristics of a urea selective catalytic reduction (SCR) system equipped on a heavy-duty diesel engine were evaluated through engine dynamometer bench tests over a scheduled world harmonized transient cycle (WHTC). Also, based on transient SCR simulations, the thermal management strategy to improve SCR NOx conversion efficiency was investigated. As a result, it was found that a selective increase in exhaust temperature at low temperature period would be a useful measure to increase SCR efficiency on WHTC mode. From the baseline SCR efficiency of around 98 % on WHTC mode, the current simulation results have shown that around 99 % level of SCR efficiency would be achievable by increasing exhaust temperatures with modifying diesel exhaust fluid (DEF) dosage. Another valuable contribution of this study is that the design guidelines for controlling exhaust temperature and DEF injection to obtain a target NOx conversion efficiency are presented for SCR systems of heavy-duty diesel engines on transient operating conditions.
Cross structured illumination for high speed high resolution line scanning confocal microscopy
Ahn, MyoungKi,Kim, Taejoong,Kim, YoungDuk,Gweon, DaeGab,Lee, Jun-Hee IOP Pub 2011 Measurement Science and Technology Vol.22 No.1
<P>Previous research presented the structured illumination confocal scanning microscope (SICSM) so as to improve the lateral resolution of the confocal microscope. However, the image acquisition speed of the SICSM is very slow and also an alignment error due to the mechanical rotation of a grating and a slit can easily occur. As a theoretical study, in this paper we propose a new SI method, the cross SI method, which improves lateral resolution and image acquisition speed. Performances of the conventional SI and the proposed SI methods are compared by analysis of the modulation transfer function. The proposed SI method shows similar lateral resolution and can shorten the image acquisition time compared to the conventional SI method. The cross structured illumination confocal microscope (CSICM) is combined with the cross SI pattern optics and the line scanning confocal microscope. We have introduced a 2-D diffractive grating, four linear polarizers and four cylindrical lenses in order to create the cross SI pattern. The effects of the cross SI pattern, intensity and visibility, on the system performance are analyzed. The CSICM has double the lateral resolution of the conventional microscope, an optical sectioning ability and a fast image acquisition speed.</P>
EURO-VI 대응 상용 디젤자동차의 후처리시스템 적용 기술
김득상(Duksang Kim),왕태중(Taejoong Wang) 한국자동차공학회 2013 오토저널 Vol.35 No.9
위에서 소개한 바와 같이 EURO-VI 배기규제 이후로부터는 승용 소형자동차와 상용 대형 디젤자동차의 배기규제 수준은 거의 동등 수준으로 유지될 것으로 예상되고 있다. 승용과 상용 모두 이러한 지속적인 배기규제 강화는 매우 높은 수준의 기술적 도전과 직면하는 것이며, 특히 상용 자동차의 경우 차량의 운전특성 및 소비자의 요구가치가 승용차와 다른 점이 많으므로 보다 다양한 관점에서 기술적 대안을 검토해야 할 필요성이 높다. 향후 본격적인 온실가스 규제 및 CO2 규제가 발효되면 그동안 소비자 가치로 인식되어 온 연비가 적극적인 규제 대상이 될 것으로 보이며, 이에 따라 연비 향상 기술이 배기규제 만족을 위한 필수 기술로 인식될 것으로 보인다. 즉, 엔진의 연소 및 후처리기술의 지속적인 발전과 더불어, 배기열 회수기술 및 Turbo-compounding과 같은 연비개선 기술이 점차 일반화될 가능성이 높으며, 이러한 기술의 도입 및 적용은 기존의 연소시스템 및 후처리시스템과 통합적으로 관리, 운용되어야만 배기 및 연비규제에 동시에 대응 가능한 기술로 정착될 수 있을 것으로 보인다. 또한 Off-highway 장비인 건설장비, 굴삭기, 비도로용 트럭, 발전기 및 선박에 이르는 다양한 Heavy-Duty 장비에도 EURO-VI 동등 수준의 배기규제 강화가 지속적으로 논의되고 있으며, 이에 대한 적극적인 기술 개발이 꾸준히 이루어져야 할 것으로 생각한다.