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최태환(TaeHwan Choi),서성훈(SungHoon Seo),송주석(JooSeok Song) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1A
암호와 알고리즘으로 블록 암호와 알고리즘은 스트림 암호와 알고리즘에 비해 빠르며 안전성이 뛰어난 많이 사용되고 있다. 현재 블록 암호화 알고리즘은 새로운 방식이 제안되기 보다는 페이스텔 암호(Feistel Cipher)에 기반하거나 그것의 변형에 기반을 두는 방향으로 발전되고 있는데 그것은 페이스텔 암호의 안전성이 검증이 되었기 때문이다. 1994년에 발표된 TEA는 작고 구현이 쉬운 블록 암호화 알고리즘으로 페이스텔 암호에 대한 연구는 암호학적인 측면에서 암호학의 기반을 이루므로 많이 진행되고 있는데 대체적으로 페이스텔 암호의 구조보다는 키 스케줄이나 페이스텔 암호를 이루는 라운드 함수에 대한 연구가 주도적이라고 보여진다. 하지만 이러한 페이스텔 암호를 이루는 페이스텔 구조에 대한 연구는 아직까지 미진한 형편이다. 본 논문에서는 TEA에 적용된 페이스텔 암호을 분석하여 TEA가 가지고 있는 페이스텔 구조에 대하여 연구해 보고자 한다.
한국어 설측음화 규칙 위반이 언어처리과정에 미치는 효과
최태환(Taehwan Choi) 한국음운론학회 2016 음성·음운·형태론 연구 Vol.22 No.1
This study aims to test Weber’s (2001) proposal on the ‘novel popout’ effect in speech sound processing when the lateralization rule is violated in Korean. Weber proposed that violation of a phonological rule would lead to facilitation rather than inhibition in the processing of a sound in the context of weak expectations in progressive assimilation and novel popout. Korean lateral assimilation was chosen in this study because the direction of the assimilation can be progressive and regressive. Two phoneme monitoring tests were performed by 24 Korean native speakers using bisyllabic non-words. One test was for progressive assimilation and the other was for regressive assimilation. The results for both tests showed that target sounds were detected faster when the assimilation rule was violated than when no violation occurred. Overall, this result is in accord with Weber’s (2001) proposal, but this study further showed that the novel popout effect occurred irrespective of the direction of assimilation. (Catholic Kwandong University)
최태환(Taehwan Choi),신은수(Eunsoo Shin),유다영(Dayoung You),이회림(Hoirim Lee),나재영(Jayeong Na),이동희(Donghee Lee),임철용(Chulyong Lim),남우철(Woochal Nam) 국방로봇학회 2023 국방로봇학회 논문집 Vol.2 No.4
Most prosthetic hands cannot automatically control their gripping motions according to target objects; users need to manually select gripping motion. To address this problem, this study integrated a vision system with the prosthetic hand to autonomously detect an object to grip and conduct a suitable grip motion. The users vision was replaced with a laser pointer and mini-cam. The user needs to indicate a target object with the laser pointer. Then, the object detection model (YOLOv5) discerns the object class and determines the gripping motion corresponding to the class. To improve the object detection accuracy, various image processing methods are applied to the detection model. Moreover, a public robot hand design (Handi-hand) was significantly modified to realize precise and robust grip motions. Actuators, joints, and stiffness components in the robot fingers were replaced with different devices for high gripping performance, and the part design was changed accordingly. The unmovable wrist was also changed to an active wrist that is controlled by a servo motor. The gripping time was determined by the user’s electromyography signals. In experiments, this prosthetic hand successfully grasped four different objects.
Visual object detection 기반 의수 제어
신은수(Eunsoo Shin),최태환(Taehwan Choi),나재영(Jayeong Na),유다영(Dayoung You),이회림(Hoirim Lee),임철용(Chulyong Lim),남우철(Woochul Nam) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Most prosthetic hands cannot automatically control their gripping motions according to target objects; users need to manually select gripping motion. To address this problem, this study integrated a vision system with the prosthetic hand to autonomously detect an object to grip and conduct a suitable grip motion. The users vision was replaced with a laser pointer and mini-cam. The user needs to indicate a target object with the laser pointer. Then, the object detection model (Scaled-YOLOv4) discerns the object class and determines the gripping motion corresponding to the class. To improve the object detection accuracy, various image processing methods are applied to the detection model. Moreover, a public robot hand design (Handi-hand) was significantly modified to realize precise and robust grip motions. Actuators, joints, and stiffness components in the robot fingers were replaced with different devices for high gripping performance, and the part design was changed accordingly. The unmovable wrist was also changed to an active wrist that is controlled by a servo motor. The gripping time was determined by the user’s electromyography signals. In experiments, this prosthetic hand successfully grasped four different objects.
Visual object detection 기반 의수 제어
신은수(Eunsoo Shin),최태환(Taehwan Choi),나재영(Jayeong Na),유다영(Dayoung You),이회림(Hoirim Lee),임철용(Chulyong Lim),남우철(Woochul Nam) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Most prosthetic hands cannot automatically control their gripping motions according to target objects; users need to manually select gripping motion. To address this problem, this study integrated a vision system with the prosthetic hand to autonomously detect an object to grip and conduct a suitable grip motion. The users vision was replaced with a laser pointer and mini-cam. The user needs to indicate a target object with the laser pointer. Then, the object detection model (Scaled-YOLOv4) discerns the object class and determines the gripping motion corresponding to the class. To improve the object detection accuracy, various image processing methods are applied to the detection model. Moreover, a public robot hand design (Handi-hand) was significantly modified to realize precise and robust grip motions. Actuators, joints, and stiffness components in the robot fingers were replaced with different devices for high gripping performance, and the part design was changed accordingly. The unmovable wrist was also changed to an active wrist that is controlled by a servo motor. The gripping time was determined by the user’s electromyography signals. In experiments, this prosthetic hand successfully grasped four different objects.
대학영어 단계별 교육과정에 대한 학습자 인식 및 만족도 연구: C대학 사례를 중심으로
김성해(Kim, Sunghae),최태환(Choi, Taehwan),사재진(Sa, Jaejin),홍서경(Hong, Seokyu) 미래영어영문학회 2021 영어영문학 Vol.26 No.1
This study aims to examine the learner perceptions and satisfactions of the level-differentiated college English classes and suggests more effective education program based on the survey results. The level-differentiated English program was designed to correspond to students’ needs and abilities and carried out as a pilot study. The classes were offered for four terms(20hours/ term), and each term had a six-tiered course. An online questionnaire was administered to 205 students. The results show that almost all the students were quite satisfied with the adequacy of the placement test. However, there was not statistically meaningful differences in students’ satisfaction with the level test. Students in lower levels such as level 1 and 2 were highly satisfied with the class operation and course in general, and seemed to get more benefits from the level-differentiated classes than intermediate and high level students. This result implies the level-differentiated curriculum is more necessary and effective for lower level students.