퍼지로직과 모델추종제어를 이용한 4륜 조향 차량에 관한 연구

백승주,오재윤,Baek, Seung-Ju,Oh, Chae-Youn 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.6

This paper develops a 3 DOF vehicle model which includes lateral, roll and yaw motion to study a 4WS vehicle. The model is used for the simulation of a 4WS vehicle behavior, and to derive a control algorithm for rear wheel steering. This paper uses a feedforward plus feedback control scheme to compute a rear wheel steering angle. The feedforward control scheme for computing the first rear wheel steering angle uses a gain which is acquired by multiplying a proper value on a gain to maintain a zero sideslip angle. The feedback control scheme for computing the second rear wheel steering angle uses fuzzy logic and model following control scheme. A linear 2 DOF model is used as a reference model for model following control, and is derived from the developed 3 DOF model by neglecting sprung mass roll motion. A reference state variable is yaw rate, and is computed using the linear 2 DOF model. J-turn and lane change maneuver simulation are performed to show the effectiveness of the developed control scheme. The simulation results show that the 4WS vehicle with the developed control scheme has much better performance in yaw rate, lateral acceleration, roll angle, and sideslip angle than the 2WS vehicle. Also, the results show that the performance of the developed control is close to the one of an optimal control which assumes all states are perfect.

철근 모사 방법에 따른 콘크리트 관통성능 변화에 관한 수치적 연구

백승주,Baek, Seung-Ju 한국시뮬레이션학회 2016 한국시뮬레이션학회 논문지 Vol.25 No.3

본 논문에서는 철근 모사 방법에 따른 관통자의 콘크리트 관통성능 변화를 수치적으로 분석하였다. 관통해석은 상용 전산해석 프로그램인 AUTODYN-3D을 사용하여 수행하였고, Hanchak의 시험 데이터를 사용하여 해석 방법의 신뢰성을 입증하였으며, 철근의 강도와 지름 및 관통자의 충돌위치, 속도를 변수로 사용하여 충돌 해석을 수행하였다. 철근 모사가 관통성능에 미치는 영향을 정량적으로 분석하기 위해, 관통자의 잔류 속도를 계산하여 침투/관통성능을 평가하였다. This paper discusses the effect of numerical reinforcement modeling methods on the penetration performance of a penetrator into a concrete target. AUTODYN-3D has been used to conduct the numerical penetration analyses. In order to validate the computational approach, experimental data of Hanchak have been compared to a computation result and a reasonably good agreement could be obtained. The strength and the diameter of a reinforcement have been changed to find out the effect of reinforcement modeling methods on the penetration performance. The impact locations and velocities of a penetrator are also changed to investigate the effect of reinforcement modeling methods. Residual velocities of a penetrator are quantitatively compared in detail for the evaluation of reinforcement modeling effects on the penetration performance.

고등학생들의 직관적인 무한소 담론과 학교수학 담론의 commognitive 갈등 사례 연구

백승주(Seungju Baek) 대한수학교육학회 2023 학교수학 Vol.25 No.3

Evaluation of Renal Uptake Rate in 99mTc-DMSA Scan on Pediatrics

백승주(Seung ju Baek),이효영(Hyo yeong Lee),길상형(Sang hyeong Gil),조경남(Kyoung nam Jo) 한국방사선학회 2015 한국방사선학회 논문지 Vol.9 No.3

소아 ⁹⁹ᵐTc-DMSA 검사에서 방광의 포함 여부에 따른 신장 섭취율의 차이를 비교 하였다. 팬텀실험과 임상실험으로 진행되었으며 3개의 컵으로 좌, 우측신장 그리고 방광에 위치시키고 좌, 우측 신장의 방사능은 일정한 양( 1.0 )으로 고정하였고 방광에 해당되는 컵에는 0, 0.5, 1, 2배 방사능의 차이를 두어 영상을 획득하였다. 임상환자는 ⁹⁹ᵐTc-DMSA (300uCi, 11MBq)을 주사하여 2시간 뒤 동일하게 영상 획득하여 각각 정량 분석하였다. 통계분석은 SPSS(ver 22.0) 으로 대응표본 T검증(paired T-test)을 사용하여 분석하였고 p<0.05는 통계적으로 유의하다고 판단하였다. 방광의 방사능을 제외한 양측 신장 섭취율은 29.83 ± 8.8%(좌측), 24.29 ± 6.66%(우측)이었고, 방광을 포함했을 때 신장 섭취율은 26.65 ± 8.03%(좌측), 21.78 ± 6.24%(우측)이었다. 신장 섭취율은 방광의 소변(방사능)이 증가할수록 양측 신장의 섭취율은 감소하였다. 이는 ⁹⁹ᵐTc-DMSA 신장스캔 시 좌, 우측 신장에서 방사능을 계수할 때 방광의 소변에 포함된 방사능의 계수가 포함되어 신장 섭취율 공식에서 총 계수가 포함되므로 실제 양측 신장 섭취율의 값이 감소되었다. The aims of this study were to evaluate the difference of renal uptake rate in 99mTc-DMSA scan on pediatrics by including the bladder. Phantom and Clinical studies were performed. In the phantom study, we put ⁹⁹ᵐTcO4⁻(300uCi, 11 MBq) in 3cups filled with distilled water at the rate 1:1:0, 1:1:0.5, 1:1:1, 1:1:2 and were placed Lt kidney, Rt kidney and bladder position on the table. To acquire the image, we used Symbia-E gamma camera from Siemens with preset count method(400,000 counts). In quantitative analysis, the counts of drawing ROIs on the phantom were analyzed. In clinical studies, we analyzed the 20 pediatrics who were examined by ⁹⁹ᵐTc-DMSA scan. At first, the images were acquired with both kidney and bladder. Secondly we acquired images after shielding the bladder. And the data were compared using a pared t-test by SPSS(ver.22.0). As a result of renal phantom’s experiment, we compared with average of uptake rate(%), 1:1:0 was Lt 43.32%, Rt 45.97%, 1:1:0.5 was Lt 35.79%, Rt 36.89%, 1:1:1 was Lt 29.68%, Rt 31.45% and 1:1:2 was Lt 22.89%, Rt 24.32%. There was no correlation between the zoom and uptake rate. The results of patient were that excluded bladder was 29.83±8.81%(Lt), 24.29±6.66%(Rt) and included bladder was 26.65±8.03%(Lt, 21.78±6.24%(Rt). This is deemed statistically significant (p<0.05). Renal uptake rate was undervalued because the counts of bladder were included in the total counts.

불평등의 다차원적 접근 -정 및 활용-

백승주 ( Seungju Baek ),금현섭 ( Hyunsub Kum ) 한국정책학회 2013 韓國政策學會報 Vol.22 No.2

본 연구의 목적은 한국사회에 존재하는 불평등을 다차원적 접근(Multidimensional approach)을 통해 실증적으로 측정해 보는데 있다. 지금까지 한 사회 내에 존재하는 불평등 정도를 측정하고 평가하는 방식은 주로 경제적 불평등(예를 들어 소득불평등)에 집중되어 왔다. 그러나 소득이외에도 교육, 건강, 돌봄, 주거 등과 같은 다양한 차원(dimensions)에서의 불평등이 발생하고 관찰되는 현실에서 소득불평등에 대한 측정과 평가만으로 한 사회 내에 존재하는 불평등 구조를 파악하기에는 한계가 있다. 따라서 소득 이외의 다양한 차원별 불평등 정도를 개별적으로 측정함과 동시에 이를 통합적으로 파악하려는 노력이 그 동안 진행되어 왔다. 다차원 불평등 지수(Multidimensional inequality index)는 바로 이러한 노력의 일환으로 최근 주목받고 있으며, 본 연구는 이를 소개하고 우리사회에 실증적으로 적용해 봄으로써 기존의 불평등 관련 논의의 외연을 넓히는데 기여하고자 한다. 실증자료의 한계로 인해 소득, 건강, 교육에 한정한 분석결과 2005년부터 2011년까지 각 차원의 불평등 정도는 감소하는 추세를 보이고 있으며, 이를 통합적으로 구성한 다차원 불평등 지수 역시 감소 추세를 나타내고 있었다. 하지만 이러한 추세에도 불구하고, 각 차원별 기여도에서는 소득수준과 교육수준의 기여도는 감소한 반면, 건강수준의 기여도는 꾸준히 증가하고 있는 것으로 나타나 최근 우리 사회의 불평등구조에 대한 차원별 차별적 역할을 확인 할 수 있었다. 또한 도시지역에서는 건강수준의 기여도가, 농촌지역에서는 소득수준의 기여도가 꾸준히 증가하는 추세를 보여 차원별 역할에 있어서 지역 간 차이가 있음을 확인할 수 있었다. The purpose of this paper is to measure inequality that exists in Korean society empirically using multidimensional approach. Until now, a method for inequality measurement has been mainly focused on economic inequality, like income inequality. However, to measure or evaluate income inequality by itself has limitations on understanding structure of inequality within society, because, in reality, inequalities have been occurring in various dimensions like education, health, and housing in addition to income. Thus, the efforts to measure the degree of inequality by various dimensions including income have been made and multidimensional inequality index (MDI), as part of this effort, has received many attentions recently. This paper introduces MDI and attempts to apply to Korean society using KOWEPS(Korea Welfare Panel Study) data with three dimensions(income, education, and health) for 2005-2011. Analysis on each dimension shows a decreasing trend just like MDI showing the same. However, we found different behaviors among them; the contribution of income and education to MDI continued to decrease, whereas that of health appeared to be steadily growing. In addition, each dimension seems to have a different role to MDI depending on regional level; health played a main role in urban whereas income did in rural.

한국어교육에서의 실제성 연구를 위한 구어의 특징 재고

백승주 ( Seung Joo Baek ) 연세대학교 언어연구교육원 한국어학당 2016 외국어로서의 한국어교육 Vol.44 No.-

This study is an in depth look at the characteristics of spoken language, and how these characteristics can effect the authenticity of Korean textbooks. The results of this study can be divided into four parts: 1) the differences between the productive units ``intonation units`` and ``sentences``. 2) the function of the regulatory unit 3) the function of constructional schema 4) spoken grammar as procedural knowledge. The first part of this study discusses the features of the intonation unit. The Intonation unit performs the function of a productive unit of verbal utterances. But dialogues in Korean textbooks are written in sentences which can lead to serious problems in authenticity. Second, the function of the regulatory unit is examined. The regulatory unit plays an important role in managing the flow of information in conversations. Third, it was determined that constructional schema is related with interaction and CTRP(complex transition relevance place). Fourth, analysis showed that spoken grammar should be considered dynamic and procedural knowledge, not declarative knowledge. The result of this study can be applied to researching the authenticity of Korean language textbooks.

소득불평등과 복지정책선호

백승주(Baek, Seungju),금현섭(Kum, Hyunsub) 서울행정학회 2012 한국사회와 행정연구 Vol.22 No.4

This paper seeks empirical evidence to test whether the median voter theorem (MVT) (Meltzer and Richard, 1981) is applicable or a relevant explanatory framework in accounting for the relationship between income inequality and support for welfare policy in Korea. Towards this end, we review the MVT and alternative models including those of Moene and Wallerstein (2001), Husted (1989). and Benabou (2000), and suggest the relationship can be separated into two stages following Kelly and Enns (2010): First, the relationship between inequality and policy preferences, and second, the transformation of policy preferences into policy proposals. Using Seoul Welfare Panel survey data and various inequality measures, we focus upon and test the first stage of the relationship, firstly, through a cross regional comparison across 25 municipal governments in Seoul, and secondly, through a comparison of serial changes in inequality and policy preferences in each of the municipalities. The findings show that higher inequality tends to be coupled with higher support for welfare policy across regions as well as across time in Seoul and offer tentative support for the MVT.

한국어 문법 교육에서의 정치적 공정성의 문제 - 여성 결혼이민자와 이주노동자 교재의 문법 항목을 중심으로 -

백승주(Baek, Seungjoo) 중앙어문학회 2021 語文論集 Vol.86 No.-

대학 강의 담화에 나타난 관여 유발 전략 -마이클 샌델 교수의 “정의: 무엇이 옳은 것인가?” 강의를 중심으로-

백승주 ( Seung Joo Baek ) 한국화법학회 2015 화법연구 Vol.0 No.29

The aim of this study is to provide an analysis of strategies for eliciting involvement in the discourses of college lecture. In order to initially determine what these strategies might be, the lecture “Justice: What’s the Right Thing to Do” with Michael Sandel at Harvard University was analyzed. The data analyzed using the methodology of classroom conversation structure analysis. Within the context of this study, involvement strategy can be divided into two categories: macro-elicitation and micro-elicitation. In this study, macro-elicitation involvement strategies such as “a topic as a medium-setting strategy”, “topic and theme construction strategy”, etc. were directly related to the way of presenting, developing, and maintaining pedagogical themes. Also, the results showed that lecturers utilized narrative strategy, dramatization frame strategy, and other similar micro-elicitation involvement strategies in their lectures. Narrative strategy can be considered an efficient way to present a vivid situation that relates to a pedagogical theme. Lecturers also used dramatization frame strategy to make their conversations with students into a scene, thus creating a pedagogical theme. The research showed that these strategies helped elicit student involvement in the contents of the lecture.

『외국인을 위한 한국어 학습자 사전』에 수록된 시각기호의 기능과 양상 : 기호학적 관점을 중심으로

백승주(Baek Seung-joo) 한국사전학회 2009 한국사전학 Vol.- No.14

This paper aims to examine semiotic architectures of the visual signs contained within the Learner’s Dictionary of Korean. In order to understand the functions of visual signs in dictionaries, I introduce the key concepts of semiotic theoriesancrage, relais, entropy, redundancy, istopie, and motivation. These theoretical concepts provide the base criteria for analysis of visual signs in dictionaries. First, I discuss the term ‘ancrage’, and ‘relais’, which were originated by Barthes. He insisted that linguistic elements in a text can serve to ‘anchor’ the meaning of and image. Conversely, an image can anchor a verbal text. This is the reason why visual signs in learners’ dictionary should be considered an essential factor. Second I examine charts, illustrations, and photos in the Learner’s Dictionary of Korean through the model of semiotic architecture. In many cases, inappropriate use of visual signs can cause a problem with understanding due to their size, shape or color. To conclude, this investigation provides concrete criteria for the development of visual signs in language learners’ dictionaries.