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정태영(Taeyoung Jeong),이승신(Seungsin Lee) 한국생활환경학회 2015 한국생활환경학회지 Vol.22 No.2
This study investigated the incorporation of nanoscale titanium dioxide (TiO₂) particles, a well-known photocatalyst, into poly(vinyl alcohol) (PVA) nanofibers via electrospinning for the development of self-cleaning textile materials that can decompose organic contaminants and stains on the textile surface by light irradiation. TiO₂/PVA nanocomposite fiber webs were fabricated from a PVA solution containing 5wt% TiO₂ nanoparticles at a web area density of 3.0g/㎡. The morphology of electrospun nanocomposite fibers was examined using a field-emission scanning electron microscope and a transmission electron microscope. The photocatalytic decomposition efficiency of the nanocomposite fibers was examined by decomposition rates of methylene blue in aqueous solution under UV light irradiation. Also, the nanocomposite fibers were contaminated by methylene blue, and the color change of methylene blue on the fibers was assessed with time of light exposure. Methylene blue solution that contained TiO₂/PVA nanocomposite fibers exhibited much lower absorbance and thus gave a higher decomposition rate compared to that with pure PVA nanofiber webs after 12 hours of irradiation. TiO₂/PVA nanocomposite fibers contaminated by methylene blue also showed a photocatalytic property for the colorant after 24 hours of irradiation. The results indicate that TiO₂/PVA nanocomposite fiber webs have potential in medical textiles and automotive textiles that require self-cleaning properties.
정태영(Taeyoung Jeong),이태형(Taehyung Lee),박근수(Kunsoo Park) 한국정보과학회 2009 정보과학회논문지 : 시스템 및 이론 Vol.36 No.2
접미사 배열은 주어진 문자열 내의 모든 접미사를 사전식 순서로 저장하는 자료 구조로, 많은 저장 공간을 사용하는 접미사 트리를 대체하면서 여러 가지 문자열 관련 문제에 사용되고 있다. 이를 O(n) 시간 내에 생성하는 것과 더불어, 실세계 입력에 대하여 작은 시간과 공간을 사용하여 구성하는 알고리즘들 역시 제안되어 왔다. 본 논문은 Maniscalco와 Puglisi[1]가 제안한 접미사 정렬 알고리즘을 분석하고, 프로그램의 수행 시간을 개선한 새로운 알고리즘을 제안한다. The suffix array is a data structure storing all suffixes of a string in lexicographical order. It is widely used in string problems instead of the suffix tree, which uses a large amount of memory space. Many researches have shown that not only the suffix array can be built in O(n), but also it can be constructed with a small time and space usage for real-world inputs. In this paper, we analyze a practical suffix sorting algorithm due to Maniscalco and Puglisi [1], and we propose an efficient algorithm which improves Maniscalco-Puglisi's running time.
중학교 영어 교과서 사진 및 삽화 인물의 문화적 편향성: 과거와 현재
정태영 ( Jeong Taeyoung ),허진 ( Huh Jin ) 글로벌영어교육학회(구 호남영어교육학회) 2017 Studies in English education Vol.22 No.4
This research examines the cultural representations of race, gender and social status in pictures/illustrations found in Korean Middle School English textbooks. It is commonly believed that the textbook in the language classroom plays an important role as an ambassador to introduce the target culture to EFL students. However, many secondary English teachers and students in Korea complain that the cultural content of Korean Middle School textbooks is severely biased not reflecting the diverse nature of speakers of English today. To investigate the cultural aspects on the characteristics of the people in the textbooks, the researcher conducted an exploratory study on the pictures/illustrations from 13 Middle School English textbooks: eight from the 7th National Curriculum and five from the 2009 Reformed Curriculum, focusing on to what extent they represent the population of the target culture. While English textbooks today tend to have better statistics than those from the past, this research finds that Korean Middle School English textbooks in general have several issues regarding cultural bias; for instance, the majority of the people from the pictures/illustrations are either Korean or White American leaving extremely few places for other races, and more male characters are presented than female ones. In addition, Black people tend to be stereotyped as either athletic or low level workers while Korean and White American male characters possess the majority of the decent white-collar jobs (228 words).
멀티미디어 활용 군사영어 말하기 평가(ME-OPI) 개발
정태영 ( Jeong Taeyoung ) 한국멀티미디어언어교육학회 2017 멀티미디어 언어교육 Vol.20 No.3
The goal of this study is to develop a Multimedia-assisted Military English Oral Proficiency Interview(ME-OPI) for specific purposes, which include English training for officer-candidates and decision making procedures for selecting personnel to be sent abroad. While there are many commercial English proficiency tests on the market, few of them measures candidates’ military English proficiency, and administering general English tests for military purposes can cause serious validity issues. To achieve the goal of this research, the researcher analyzes the current English curriculum of the Korea Military Academy and the evolving needs from the Army Headquarter to produce an authentic, valid as well as reliable English proficiency test. Then, the researcher develops a ME-OPI following Hughes’ ten-step test development procedures. The ME-OPI then is validated and calibrated to better function as a meaningful tool for speaking test for military purposes.
정태영(Taeyoung Jeong),이경수(KyongsuYi) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A lane change algorithm for collision avoidance of a intelligent cruise control system has been proposed in<br/> this paper. Steering control algorithm is activated in the case that relative distance is less than a critical<br/> distance which is computed using headway time, relative velocity, brake actuator delay, and the minimum<br/> acceleration of the controlled vehicle. We introduces two feedforward terms ; using nominal steering control<br/> input and nominal lane changing trajectory. Those of feedforward control input has been determined taking<br/> into account nonlinear vehicle dynamic characteristics. The performance of the proposed lane change<br/> algorithm has been investigated via simulations. It has been shown from simulation results that the proposed<br/> steering control algorithm provides good lane change and collision avoidance performance with a comfortable<br/> ride
정태영(Taeyoung Jeong),하정수(Jungsoo Ha),이경수(KyongsuYi),김정태(Jungtae Kim) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
This paper presents a stability margin and a specifications of vehicle stability controller by means of dynamic<br/> simulation model which validates dynamic behavior of vehicle. The model is consisted of 6-DOF sprung mass and<br/> 4-quarter car model for vehicle body dynamics. Powertrain model including differential gear and Pacejka tire model<br/> is applied. We validate a vehicle behavior under nominal cornering situations and critical driving conditions with<br/> general steering controller.