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.

예비 한국어 교사의 교사 발화 분석 -모의 문법 수업 실습 사례를 중심으로-

백승주 ( Seung Joo Baek ) 이중언어학회 2013 이중언어학 Vol.53 No.-

This paper attempt to analyse pre-service Korean teacher`s utterance. For this purpose, I used classroom conversation structure analysis methodology and the eliciting involvement theory presented by Baek(2011 a). Research results show that pre-service Korean language teachers fail to managing classroom discourse due to several factors. The first factor is ‘a failure to control language strategy’. The analysis indicates that misuse of language, presenting difficult vocabularies can be related to failing to control the quantity of information. The second factor is ‘a failure to set a familiar topic’. The third factor is ‘an inappropriate manner of topic development’. The fourth factor is ‘an inappropriately constructing phases of a lesson’. These factors hinder students from engaging in a pedagogical theme. The results of this study could assist pre-service Korean language teachers in understanding how to the effectively structure classroom conversation. It could also contribute to developing programs aimed at pre-service teacher training. (Sogang University)

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.

제 2언어 교실에서의 질문 분류 방식과 기능에 대한 재고 1 -"정보 조회 질문"과 "정보 확인 질문"을 중심으로-

백승주 ( Seung Joo Baek ) 이중언어학회 2011 이중언어학 Vol.47 No.-

This paper examines the ways of classification for questions in a second language classroom setting. In order to examine the validity on standards of classification, the various problems of referential questions and display questions proposed by Long & Sato (1983) were reviewed. Long & Sato (1983) insist that referential questions can promote student-teacher interaction in the classroom. In contrast, they argue that display questions can cause students to become passive. However, based on the frameworks of conversation analysis, I insist that questions do not have their own function, and the role of questioning can change depending on the instructional object, lesson level, and structure of conversation in the classroom. (Sogang University)

디지털 미디어 퍼포먼스 공간에서의 프레즌스(Presence) 효과에 관한 연구

백승주 ( Seung Ju Baek ),권승경 ( Seung Kyung Kwon ),김재범 ( Jai Beom Kim ),장동련 ( Don Ryun Chang ) 한국기초조형학회 2011 기초조형학연구 Vol.12 No.4

과거 물리적 실체에 머물러 있던 공간의 개념은 테크놀로지와 미디어의 발전으로 점차 비(非)물질화되어가는 경향을 보인다. 본 연구는 비(非)물질화 공간의 향후 연출 방향에 대한 시사점 찾고자 하였다. 연구 대상은 디지털 미디어에 의해 비(非)물질화된 공간 중 홀로그래픽 미디어를 활용한 퍼포먼스 공간으로 선정하였고, 분석을 위해 프레즌스(Presence) 이론을 활용하였다. 프레즌스를 가져오는 결정요인을 인지적, 감각적 측면으로 나누고, 두 요인을 대표하는 디지털 미디어 퍼포먼스 공간 사례를 통해 각각의 요인이 프레즌스와 프레즌스 효과에 미치는 영향을 서로 비교함으로써 비(非)물질화 공간의 연출법에 대해 모색하였다. 그 결과 감각적 요인을 충족하는 수준이 높다면, 인지적 요인이 파괴되어도 프레즌스가 나타남을 알 수 있었고, 오히려 이러한 연출방법이 프레즌스 효과에서는 더욱 강하게 나타남을 확인할 수 있었다. 즉, 환영적 내용 요소가 형태적으로 실존하는 것처럼 지각되었을 때, 실재감(Presence)을 불러일으킬 뿐 아니라, 이에 수반하는 기억, 즐거움, 각성의 심리적 효과가 증가한다는 것을 알 수 있었다. 비(非)물질화 공간의 활용 방법은 비(非)물질화 특성을 활용해서 현실에서 구현할 수 없는 허구적 이야기를 가상 영상과 융합하여 실체화시킴으로써 체험자에게 새로운 경험을 제공하는 것이다. 테크놀로지와 미디어의 진화로 감각적 요인측면이 확장되고 강화된 상황에서 공간이 갖고 있는 물리적 맥락을 깨고, 보다 개념적인 공간을 실체화시킴으로써 사람들에게 새로운 경험을 제공할 수 있을 것이며, 공간에 대해서도 새로운 비전을 제시할 수 있을 것이다. 또한 본 연구를 통해 비(非)물질화 공간의 연출에 있어 감각적 요인 중 상호작용 요인의 역할이 상당히 중요하다는 것도 알 수 있었다. 따라서 앞으로 비(非)물질화 공간 연출에 있어 디지털과 사람과의 소통을 적극적으로 활용하여 연출할 필요가 있을 것이다. The concept of space which remained at a physical substance in the past is showing the tendency of immaterialization due to the advancement of technology and media. This study intends to find the implications for future directions in the directing of the dematerializing space. For the study subject, the performance space utilizing holographic media was selectedamong spaces dematerialized by digital media, and presence theory was utilized for analysis. The determinative factor that brings presence was divided into cognitive and sensible sides, and the digital media performance space cases representing these two factors were examined to compare the influence of each factor on presence and presence effect in an effort to find the direction method of dematerializing space. As the result, it was found that if the level of satisfaction of sensible factor was high, presence would appear despite the destruction of cognitive factor, and it was confirmed that such direction method would appear even stronger in presence effects. That is, when the illusory content factor is perceived as being formally existent, it was found not only to invoke presence, but also to increase the accompanying memory, joy, awakening and such mental effects. The utilization method of dematerializing space involves utilizing the property of immaterialization to substantialize the fictional story which cannot be actualized in reality by fusing with virtual images and provide a new experience to the subjects. The evolution of technology and media expands and strengthens the sensible factor, where the physical context of the space can be broken, and a more conceptual space can be substantialized to provide a new experience to people, and a new vision can be suggested for space as well. Also, through this study, it was found that the role of interactive factor is quite important among the sensible factor in directing the dematerializing space. Thus, for directing the dematerializing space in the future, it would be necessary to actively utilize the communication of digital and human being.

한국어 교재의 단원 구성에 대한 텍스트기호학적 분석 -상호텍스트성을 중심으로-

백승주 ( Baek Seung-joo ) 이중언어학회 2020 이중언어학 Vol.81 No.-

This research aims to study the unit configuration method of Korean language textbook into text-semiotics method. In this study, it specifically examined how the texts forming a unit of Korean language textbook has the intertextual relations. To this end, the following analysis procedures were conducted in this study. First, it classified the subject texts forming the unit, and examined that which teaching and learning unit composes the subject texts. Second, it identifies its pattern where and how the teaching and learning contents appears in each subject text. Third, it figured out whether the element in the preceding subject text appears in the following subject text and, if so, what kind of relation it has. It is to examine how the cohesion of formal layer and the coherence of semantic layer form in textbook text. Finally, based on this, it examined that the input and output were structured in the textbook unit from the perspective of second language acquisition. It showed that the unit of analysis subject combined the narration and teaching and learning contents of a specific person, and repeatedly entered the target sentence and communication function with the story of the person. As a result, the texts within the unit of analysis subject had a strong intertextual relation each other, and it was verified that this was an efficient way of providing input to learners and teachers. (Chonnam National University)

제 2언어 교실에서의 질문 분류 방식과 기능에 대한 재고 2

백승주 ( Seung Joo Baek ) 이중언어학회 2012 이중언어학 Vol.50 No.-

This paper aims to examine the validity on standards of classification for questions which were proposed by Long & Sato(1983). According to Long & Sato (1983), referential questions are asked to get information from students(which implies a teacher doesn`t know a student s answer), and display questions(evaluative question) are asked to establish the student`s knowledge of an answer.(which implies a teacher already knows the correct answer.) To examine these standards, I analyze the frame of classroom conversations. The analysis shows that a frame shift from a general classroom conversation frame to a dramatization frame occurs often. Dramatization frame is used to make the conversation between teacher and student as a scene, thus creating a pedagogical theme. In dramatization frame, teacher and student havea conversation as a real self and they have a dramaturgical role in the scene at the same time. In dramatization frame, a teacher doesn`t know a students` answer and the teacher expects proper answers fitted into the scene. In dramatization frame, teacher`s questions cannot be categorized as referential questions but also display questions. It implies that the line between referential questions and display questions is blurred. The results of this study can contribute to set new standards of classification for questions. (Sogang University)

논문 : TV 뉴스를 이용한 한국어 교재 구성의 원리와 실제

백승주 ( Seung Joo Baek ) 국제한국어교육학회 2013 한국어 교육 Vol.24 No.4

The purpose of this study is to introduce principles and methods to develop Korean language textbooks using TV news. To set the principles of developing Korean language textbook using TV news, I attempt to examine the textuality of Korean language textbooks. Based on the result of this analysis I can obtain the principles of textbook development. Secondly, I will analyze the textuality of TV news. The results of this analysis will provide other specific principles of developing Korean language textbook using TV news. Lastly, I will suggest a procedure for developing Korean language textbook using TV news. The result of this study can contribute to setting the concrete criteria for evaluating textbooks. (Sogang University)

극한지 외기온도 변화에 따른 철도터널 동결깊이 특성에 관한 연구(북한지역을 중심으로)

백승주(Seung Ju Baek),김효규(Hyo Gyu Kim),김대상(Dae Sang Kim),조국환(Kook Hwan Cho) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10

국내의 철도건설은 경부선과 호남선을 주축으로 건설되었다. 현재 원주~강릉간 고속화철도가 건설중이며, 춘천~속초간 철도건설 타당성조사 등 강원 산간지역의 철도건설이 추진되고 있다. 그동안 기후영향에 대해 민감하지 않았던 철도건설 조건은 북한철도건설을 감안하여 다각적인 기후영향 검토가 필요하다. 본 논문에서는 남북한의 최저기온과 동결지수 등 기후를 분석하였다. 또한 극한 외기온도 변화가 예상되는 북한지역의 기후분포에 따른 철도터널 동결깊이 특성에 대한 시뮬레이션 해석수행과 기존 도로터널의 연구사례 등을 비교·분석하여 철도터널 동결깊이 특성에 관하여 연구하였다. Railway construction of the domestic was built on the hub of Gyeongbu and Honam Line. Currently, Wonju-Gangneung high-speed railway is under construction. Railway construction of mountainous areas of Kangwon is also being pursued such as Chuncheon-Sokcho railway line construction feasibility study. While, The temperature condition in southern part of Korea is not severely considered. However, In consideration of the railway construction of North Korea, it is necessary to consider the impact on the climate diversified. The temperature range which is freezing to hot through a year in North Korea is investigated. The extreme outside temperature simulation analysis of the railway tunnel freezing depth distribution characteristics of climate change in North Korea is expected. Railway tunnel considering the extreme freezing temperature condition was studied in freeze depth analysis using the characteristics of measured road tunnel data.