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Jung, Taeyoung,Jo, Hong Li,Nam, Sang Hwan,Yoo, Byeongjun,Cho, Youngho,Kim, Jongwoo,Kim, Hyung Min,Hyeon, Taeghwan,Suh, Yung Doug,Lee, Hohjai,Lee, Kang Taek The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.20
<P>Lanthanide-doped upconverting nanoparticles (UCNPs, NaYF4:Yb3+, Er3+) are well known for emitting visible photons upon absorption of two or more near-infrared (NIR) photons through energy transfer from the sensitizer (Yb3+) to the activator (Er3+). Of the visible emission bands (two green and one red band), it has been suggested that the red emission results from two competing upconversion pathways where the non-radiative relaxation occurs after the second energy transfer (pathway A, I-4(15/2) -> I-4(11/2) -> F-4 -> -> H-2(11/2) -> S-4(3/2) -> F-4(9/2) -> I-4(15/2)) or between the first and the second energy transfer (pathway B, I-4(15/2) -> I-4(11/2) -> I-4(13/2) -> F-4(9/2) -> I-4 ->). However, there has been no clear evidence or thorough analysis of the partitioning between the two pathways. We examined the spectra, power dependence, and time profiles of UCNP emission at either 980 nm or 488 nm excitation, to address which pathway is preferred. It turned out that the pathway B is predominant for the red emission over a wide range of excitation powers.</P>
New Modularization Method to Design Supervisory Control of Automated Laboratory Systems
Taeyoung Jung(정태영) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.1
This paper describes the application of discrete event systems theory to the design of an automated laboratory system. Current automated laboratory systems typically consist of several interacting processes that must be carefully sequenced to avoid any possible process conflicts. Discrete Event Systems (DES) theory and Supervisory Control Theory (SCT) can be applied together as effective methods of modeling the system dynamics and designing supervisory controllers to precisely sequence the many processes that such systems might involve. Classical approaches to supervisory controller design tend to result in complex controller structures that are difficult to implement, maintain, and upgrade. In this paper, a new approach to designing supervisory controllers for automated laboratory systems is introduced. This new approach uses a modular controller structure that is easier to implement, maintain, and upgrade,and deals with state explosion issues in a novel and efficient way.
고온·고압 분위기에서의 충돌 후 분무거동에 관한 실험적 연구
조태영(Taeyoung Cho),안병규(Byoungkyu Ahn),정병국(Byongkoog Jung),송규근(Kyukeun Song),정재연(Jeayoun Jung) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.5
The Characteristics of diesel Spray have much effect on the engine performances such as power, fuel consumption rate and emissions. Therefore, the measurement of fuel spray characteristics is very important for the improvement of heat engine.<br/> In this studies, We examined about impinging spray considering ambient density (l8,24,30 ㎏/㎥), ambient temperature (293,473K), impingement angle(0,30,45°). The images of impinging spray were obtained by the high speed video camera. After that we analyzed the impinging spray characteristics to use the images.<br/> From theses results. The effects of ambient density, ambient temperature and impingement angle on the characteristics of impinging spray were investigated.<br/> Finally, the experimental equations of the radius and the height of the impinging spray were proposed as functions of above mentioned variables<br/>
Choi, Jungil,Yoo, Jungheon,Kim, Ki-jung,Kim, Eun-Geun,Park, Kyung Ock,Kim, Hyejin,Kim, Haeun,Jung, Hyunju,Kim, Taeyoung,Choi, Myungjin,Kim, Hee Chan,Ryoo, Sungweon,Jung, Yong-Gyun,Kwon, Sunghoon Springer-Verlag 2016 Applied microbiology and biotechnology Vol.100 No.5
<P>Tuberculosis (TB) is a major global health problem, and multi-drug-resistant TB (MDR-TB) and extensively drug-resistant TB (XDR-TB) are spreading throughout the world. However, conventional drug susceptibility test (DST) methods, which rely on the detection of the colony formation on a solid medium, require 1-2 months to the result. A rapid and accurate DST is necessary to identify patients with drug-resistant TB and treat them with appropriate drugs. Here, we used microscopic imaging of Mycobacterium tuberculosis (MTB) immobilized in an agarose matrix for a rapid DST. The agarose matrix, which was molded in a microfluidic chip, was inoculated with MTB, and TB drugs in liquid culture medium diffused throughout the agarose to reach the MTB immobilized in the agarose matrix. After the responses of MTB to drugs were tracked with an automated microscopic system, an image-processing program automatically determined the susceptibility and resistance of MTB to specific doses of TB drugs. The automatic DST system was able to assess the drug susceptibility of various drug-resistant clinical TB strains within 9 days with an accuracy comparable to that of conventional method. Our rapid DST method based on microscopic time-lapse imaging greatly reduces the time required for a DST and can be used to rapidly and accurately treat TB patients.</P>