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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.
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㎚.
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.