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마이크로 비구면 렌즈 가공을 위한 초정밀 위치 제어 방법
김형태(HyungTae Kim),양해정(HaeJeong Yang),김성철(SungChul Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A control method in interpolating aspherical tool path was proposed and experimented in a nano accuracy machine. The characteristics of this method are in velocity control by position feedback and nano level of position error. A tool path was partitioned by a distance interval and the ideal control inputs were calculated at each section. A section had accelerating region and velocity region. A motion profile at the section was determined from a surface function, feed speed and velocity-acceleration relation. The concept of control was originated from correcting ideal speed with feedback error. The motion profile was determined from acceleration ratio, feed rate, step size, position gain, and velocity gain. An experimental apparatus was constructed to evaluate the performance of this algorithm. Nano accuracy linear encoders were installed to check position control error. The control error of interpolating aspherical tool path was below ±170㎚.
김형태(Hyungtae Kim),백준기(Joonki Paik) 대한전자공학회 2015 전자공학회논문지 Vol.52 No.5
본 논문에서는 사용자의 입력을 포함한 반자동 카메라 교정 방법을 제안한다. 제안된 방법은 사용자가 정의한 기준선을 소실점 추정을 위한 정보로 사용하는 동시에, 추정 과정에서 발생하는 아웃라이어 제거를 위한 추가 제약 조건으로 사용한다. 제안된 카메라 교정 방법은 대수적, 기하학적 방법을 모두 사용하여 기존 방법으로는 불가능한 조건에서 교정이 가능하도록 성능을 확장하였다. 교정 실험 결과를 통해 제안하는 방법이 기존 자동 교정보다 교정 정확도가 높은 것을 확인하였다. In this paper, we propose the semi-auto camera calibration method including user input. The proposed method estimates the vanishing points using user defined reference lines and defines the constraint for reducing outlier in vanishing points estimation process. The proposed camera calibration method based on both algebraic and geometric method improves a calibration performance for difficult condition, which represents that existing method can’t calibrate a image. Experimental results show that the proposed method calibration accuracy higher than existing method.
김형태(Hyungtae Kim),도중석(Jungseok Do),오세훈(Sehoon Oh),김기창(Kichang Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The stiffness of Body is known to be a important factor affecting a vehicle performance. I have studied the correlation, especially between body attachment stiffness and roadnoise in this study. For high stiffness, analyzed the body attachment structure using “Trees Analysis Method”. I provided target value for each input point and high influence position for road noise performance.
그래픽 구성도를 활용한 교수법이 한국인 영어학습자의 영문법 습득에 미치는 영향
김형태(Kim, Hyungtae),최윤희(Choe, Yoonhee) 미래영어영문학회 2017 영어영문학 Vol.22 No.3
The purpose of this research was to investigate the effects of graphic organizer instruction on English grammar acquisition of Korean EFL learners. Participants were 25 Korean secondary school students in Seoul. The period of this experiment was eight-week long and each class lasted for one hour, including a twenty-minute test. The tests were assigned twice a week. The data were analyzed using SPSS 19.0 through pre- and post-test of English grammar. The results are as follows. First, participants showed meaningful improvement in four parts―the distinction of parts of speech, adjective and adverb, adjectival and adverbial phrases and noun clauses, relative clauses and subordinate clauses in the sentence of English grammar, but showed little improvement in learning tenses, passive voices, gerund, and infinitives. Second, the participants reported their increased interests in learning English grammar using graphic organizers. The results provide some pedagogical implications for effective English grammar instruction using graphic organizers.