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이진성(Lee Jinsung) 한국사회언어학회 2014 사회언어학 Vol.22 No.3
This study is a follow-up study of Lee's(2001) “A study of malpractice of orthography among Korean college students-with a special emphasis on the influence of chatting language”. Within the similar research framework, Some malpractice of orthography in current college students' essays were compared with those of Lee's. The aim of this study, therefore, is to find out how, in what aspects and extents, the influence of chatting language on formal written language has manifested different characteristics after a span of 13 years. Regardless of the drastically increased use of chatting language these days, most of its characterizing features were found to be significantly declined in current students' essays, compared with Lee's(2001). Expressions or vocabularies mainly suitable for spoken colloquial language, however, were observed to be adopted much more frequently and freely in formal written essays. This study additionally investigated the Korean orthography rules on separating words, which were not dealt in Lee's. Violations relating to separating words were found to be seriously grave, which can be considered as a direct negative influence of general writing practice of chatting language, where the rules are routinely ignored chiefly for the economy of space and time.
Lee, Dongtak,Lee, Hyungbeen,Lee, Gyudo,Kim, Insu,Lee, Sang Won,Kim, Woong,Lee, Sang Woo,Lee, Jeong Hoon,Park, Jinsung,Yoon, Dae Sung IOP 2019 Nanotechnology Vol.30 No.8
<P>With the rapid development of nanotechnology and its associated waste stream, public concern is growing over the potential toxicity exposure to heavy metal ions poses to the human body and the environment. Herein, we report an extremely sensitive Kelvin probe force microscopy (KPFM)-based platform for detecting nanotoxic materials (e.g. Ag<SUP>+</SUP>) accomplished by probing the integrated surface potential differences of a single gold nanoparticle on which an interaction between probe DNA and target DNA occurs. This interaction can amplify the surface potential of the nanoparticle owing to the coordination bond mediated by Ag<SUP>+</SUP> (cytosine–Ag<SUP>+</SUP>–cytosine base pairs). Interestingly, compared with conventional methods, this platform is capable of extremely sensitive Ag<SUP>+</SUP> detection (∼1 fM) in a remarkably wide-range (1 fM to 1 <I>μ</I>M). Furthermore, this platform enables Ag<SUP>+</SUP> detection in a practical sample (general drinking water), and this KPFM-based technique may have the potential to detect other toxic heavy metal ions and single nucleotide polymorphisms by designing specific DNA sequences.</P>
A simple and disposable carbon adhesive tape-based NO<sub>2</sub> gas sensor
Lee, Sang Won,Lee, Wonseok,Lee, Dongtak,Choi, Yeseong,Kim, Woong,Park, Jinsung,Lee, Jeong Hoon,Lee, Gyudo,Yoon, Dae Sung Elsevier 2018 Sensors and actuators. B Chemical Vol.266 No.-
<P><B>Abstract</B></P> <P>Nitrogen dioxide (NO<SUB>2</SUB>) is one of the toxic gas that causes debilitating disease in the respiratory system. Due to imprudent industrial development, the need for a facile and sensitive gas detection has been grown. Here, we develop a simple and disposable NO<SUB>2</SUB> gas sensor employing carbon adhesive tape (CAT) as the gas detection element. The CAT developed in this study contained a large amount of carbon black material to adsorb NO<SUB>2</SUB> gas molecules. Experiments revealed that the gas molecules were bound rapidly to the CAT sensor (<3 min). The chemical and physical characteristics of the CAT were investigated by thermal gravimetric analysis, X-ray photoelectron spectroscopy, and scanning electron microscopy. With increases of bound NO<SUB>2</SUB> gas molecules, electrical conductance was augmented. Analytical sensitivity of the CAT-based gas sensor was estimated to be 5 ppm, lower than the concentration generally considered as a minimum concentration to cause harm to people. In addition, we tested such CAT sensor for detecting NO<SUB>x</SUB> from car exhaust, suggesting the possibility of its practical application. Taken together, our results indicate that CAT-based gas sensor developed in this study is applicable as a robust, facile, and disposable NO<SUB>2</SUB> gas sensing platform.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CAT-based gas sensor is applicable as a robust, facile, and disposable NO<SUB>2</SUB> gas sensing platform. </LI> <LI> Electrical conductance of CAT chip is increased depending on the exposure time (0–10 min) and concentration (0–100 ppm) of NO<SUB>2</SUB> gas. </LI> <LI> Detection time of NO<SUB>2</SUB> gas is less than 3 min with enough sensitivity (∼5 ppm) which is lower than the concentration generally considered as a minimum concentration (10 ppm) to cause harm to human. </LI> <LI> CAT chip can detect NO<SUB>2</SUB> gas from the car exhausts such as gasoline and diesel regardless of humidity (H<SUB>2</SUB>O), carbon dioxide (CO<SUB>2</SUB>), nitrogen (N<SUB>2</SUB>) and dust. </LI> </UL> </P>
Free Final-Time Low Thrust Trajectory Optimization Using Homotopy Approach
Jinsung Lee,안재명 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.5
This paper discusses the application of the homotopy approach to optimizing the free-flight-time low-thrust trajectory considering the performance characteristics. The trajectory optimization problem is formulated as an optimal control problem (two-point boundary value problem). The developed homotopy algorithm to solve the optimal control problem comprises three steps—orbital energy/acceleration matching, flight-time matching, and orbital reshaping. A comprehensive case study demonstrates the effectiveness of the proposed homotopy-based optimization algorithm for an optimal design of a low-thrust trajectory involving long mission time.
Jinsung Lee 한국사회언어학회 2010 사회언어학 Vol.18 No.2
This paper accommodates EIL(English as an international language) together with EFL in English pronunciation teaching and learning. In recognizing EIL, I suggest three strategic levels for phonological norms in assessing leaners’ pronunciation: the level P(phonemic) as a mandatory level to achieve, the level NLA(native language accent) as a cautious level to suppress the native accent, and the level TLA(target language accent) as a desirable level to accomplish a "native-like" accent. After probing the significance of each level, the paper addresses the issue of learning patterns depending on different proficiency levels, together with the effect of formal instruction. The sounds under investigation are English /l/, /r/, and /si/ for the level P, Korean Nasalization and Lateralization for the level NLA, and English /p, t, k/ for the level TLA. Two groups of local college sophomores served as experimental subjects, one as an intermediate group and the other as beginners group. The correctness rate for each level turned out to be the level TLA the lowest(14.21%~ 22.22%), the level NLA the next (49.37%~57.95%), and the level P the highest(66.47%~74.08%). The level TLA achieved the highest effect of formal instruction(13.30%), and the other two levels achieved less effect(5.69%~5.79%). In the level NLA, three factors that affect native interference are suggested: familiarity, syntactic distance, and the length of previous vowels. It is argued that the lowest correctness rate of the level TLA is less alarmimg than the low number indicates, while the level P is more demanding to overcome regardless of the highest correctness rate in regard to effective communication in English.