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외국인 유학생을 위한 e-PBL 모형과 단계별 스캐폴딩 연구 -온라인 학문 공동체를 중심으로-
백수원 ( Back¸ Suwon ),이경 ( Lee¸ Kyung ) 국제한국어교육학회 2021 한국어 교육 Vol.32 No.4
The purpose of this study is to design e-PBL problems and instructional models for learners for academic purposes, and to present examples of scaffolding that can support e-PBL activities at each stage of the model. To this end, this study developed an unstructured problem and an e-PBL model appropriate for problem-solving learning and applied it to two academic communities composed of international students. Through this, the scaffolding cases of appeared the learner’s academic community activities were derived inductively, and additionally necessary scaffolding was extracted through post-survey and interviews. As a result, an e-PBL instructional model consisting of four stages of problem definition, problem search, problem solving, presentation and evaluation was proposed. In addition, cognitive and affective scaffolding, etc., were derived which can promote and help international students’ problem-solving activities at each stage of the model. The results of this study can be used to design and operate e-PBL classes for international students in the future. (Mokpo National Maritime University·Honam University)
Quaternion-based 3D Attitude Tracking Algorithm Using Virtual Roll Angle for Missile Systems
Suwon Lee 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.10
In this paper, a new type of three-dimensional attitude tracking algorithm for missiles is derived. A virtual roll angleis adopted to obtain additional control availability. The proposed attitude tracking algorithm is analyzed in a four-dimensional quaternion space. Based on the proposed algorithm, the attitude tracking algorithm can be designed more efficiently than in the existing control systems. A nonlinear attitude tracking algorithm is designed for the proposed control system, and an adaptation law for uncertainty is also designed. It is verified through numerical simulations that the proposed control system and tracking algorithm can successfully perform attitude tracking.
Motion Primitives for Designing Flexible Gesture Set in Human–Robot Interface
Suwon Shon,Jounghoon Beh,Cheoljong Yang,David K. Han,Hanseok Ko 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper proposes motion primitives for designing a gesture set in a gesture recognition system as Human-Robot Interface (HRI). Based on statistical analyses of angular tendency of hand movements in sign languages and hand motions in practical gestures, we construct four motion primitives as building blocks for basic hand motions. By combining these motion primitives, we design a discernable "fundamental hand motion set" toward improving machine based hand signal recognition. Novelty of combining the proposed motion primitives is demonstrated by a "fundamental hand motion set" recognizer based on Hidden Markov Model (HMM). The recognition system shows 99.40% recognition rate on the proposed language set. For connected recognition of the "fundamental hand motion set", the recognition system shows 97.95% recognition rate. The results validate that using the proposed motion primitives ensures flexibility and discernability of a gesture set. It is thus promising candidate for standardization when designing gesture sets for human-robot interface.
Bag-of-binary-features for fast image representation
Suwon Lee,Choi, SuGil,Yang, Hyun S. IET 2015 Electronics letters Vol.51 No.7
<P>The possibility of integrating binary features into the bag-of-features (BoFs) model is explored. The set of binary features extracted from an image are packed into a single vector form, to yield the bag-of-binary-features (BoBFs). The efficient BoBF feature extraction and quantisation provide fast image representation. The trade-off between accuracy and efficiency in BoBF compared with BoF is investigated through image retrieval tasks. Experimental results demonstrate that BoBF is a competitive alternative to BoF when the run-time efficiency is critical.</P>
On referential vagueness: A comparative study of English and American Sign Language
Suwon Yoon 경희대학교 언어정보연구소 2021 언어연구 Vol.38 No.1
In addition to the widely known Free Choice Items (FCIs), there exists another type of anti-specific item, known as existential indeterminate or Referentially Vague Items (RVIs) such as some-X-or-other in English. Such polarity items are characterized to be rather semantically non-emphatic, and their non-emphaticness is modeled as referential vagueness as a speaker-based felicity condition of minimal, non-exhaustive variation. Both FCIs and RVIs are anti-specificity phenomena, relying on a speaker’s epistemic judgment, but distinct in that, whereas FCIs require exhaustive variation, RVIs require partial, non-exhaustive variation. However, the landscape of specificity in signed languages has been less well-defined. In this background, the main goal of current study is twofold: first, by identifying an RVI sign in ASL, equivalent to RVIs in English, I support the necessity of the notion of referential vagueness to correctly capture the meaning and distribution of non-emphatic, non-exhaustive NPIs occurring in nonveridical contexts; and second, I show how both English and ASL exhibit a remarkable case of semantic-o-pragmatic extension from anti-specificity (as RVIs) to anti-veridicality (as metalinguistic negation).