• 한국음향학회:학술대회논문집
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• 한국음향학회 1994년도 FIFTH WESTERN PACIFIC REGIONAL ACOUSTICS CONFERENCE SEOUL KOREA
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• pp.984-990
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• 1994

In this paper a new speech synthesis method in the time domain using mono-syllables is proposed. It is to overcome the degradation of the synthetic speech quality by the synthesis method in the frequency domain and to develop an algorithm in the time domain for the prosodic control. In particular when we use a method in a time domain with mono-syllable as a synthesis unit it will be the main issues which are to control th pitch period and to smooth the energy pattern. As a solution to the pitch control, a method using Lagrange interpolation is suggested. As a solution to the other problem, an algorithm which can control the amplitude envelop shape of mono-syllable is proposed. As the results of experiments it was possible to synthesize unlimited Korean speeches including the prosody control. Accoding to the MOS evaluation the quality and the naturality in them was improved to be a good level.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.993-995
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• 1996

This paper proposes an adaptive Filtered-X LMS algorithm with robustness. The proposed system updates filter parameters to keep the performance even if the conventional Active Noise Control (ANC) system well does not work. As a result of the computer simulation, the proposed system has all the advantage of the system using the conventional Filtered-X LMS algorithm. Also some results from the proposed algorithm present that the system is stable when the Adaptive filter does not work. Therefore, the proposed system using the Adaptive Filtered-X LMS algorithm must have much advantage than the system using the conventional algorithm in the side of the stability and performance.

• 대한공업교육학회지
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• 제30권2호
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• pp.82-103
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• 2005

The purpose of this study was to develop and present the accreditation criteria for engineering technology education programs in junior colleges. Research methods used in this study were review of related literature, experts discussion, and Delphi technique. Especially, Delphi technique was the major research method of this study. The Delphi surveys were taken for about seven weeks and three rounds at a higher level of expert participation. Major results of the study were as follows: 1. It proved that thirty six of total forty items had the content validity as the accreditation criteria of engineering technology education programs for junior colleges. CVR(Content Validity Ratio) of four items were below .33 and eliminated four items from the final accreditation criteria. 2. It proved that total Cronbach ${\alpha}$ was very high .9142 and reliability was very high all over items. It proved that six items made worse reliability, therefore it was desirable to exclude six items for increase of reliability. But the final accreditation criteria included six items, because they had a high validity as well as increasing rate of Cronbach ${\alpha}$ was very low with the exception of them. 3. Items of high importance were drawn out through analysis of importance. It proved that thirty of total forty items were more than 4.00 average in importance and ten items were less than average. 4. In conclusion, the final accreditation criteria were developed and presented through such analysis of validity, reliability and importance. The final accreditation criteria for engineering technology education programs in junior colleges were composed of seven domains of educational objectives, learning outcomes, curriculum, staff, facilities, institutional support, and student assessment.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1991년도 춘계공동학술대회 발표논문 및 초록집; 전북대학교, 전주; 26-27 Apr. 1991
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• pp.367-368
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• 1991

• 대한전기학회:학술대회논문집
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• 대한전기학회 1990년도 추계학술대회 논문집 학회본부
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• pp.323-325
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• 1990

In this paper, a new method to track the maximum power point is presented. The proposed scheme achieves the maximum power the step-up chopper, which tracks the maximum power point by sensing only the actual current from the photovoltaic array. Also it adopts the protect ion circuit to protect the battery system against the overvoltage and overvoltage by utilizing hysterisis characteristic.

• 공업화학
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• 제5권6호
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• pp.957-966
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• 1994

HZSM-5와 Ag 이온으로 교환된 ZSM-5를 촉매로 사용하여 부탄과 1-부텐으로부터 방향족 화합물로의 전환반응을 수행하였다. 방향족 탄화수소의 수율은 HZSM-5 내에 Ag 이온을 도입함으로써 현저하게 증가하였다 Ag 이온들은 출발원료인 탄화수소의 탈수소 촉매로서 작용하였다. 부탄과 1-부텐의 탈수소 과정에서 생성된 수소는 $Ag^+$ 이온을 Ag 금속으로 환원시킴과 동시에 산점의 형성을 유발하였다. Ag의 담지량이 다른 ZSM-5를 촉매로 사용하여 1-부텐의 전환반응을 수행하고, 이들 촉매의 산점특성 변화에 따른 효과를 검토하였다.

• 공학교육연구
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• 제18권5호
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• pp.59-66
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• 2015

In the on-line pre-learning which is applied in this study, on line pre-learning, in-class, post-learning are circulated together in the same experiments. The on-line pre-learning has been tried to 136 students in A junior college in Seoul for 3 years. The effects of their self-regulated learning are as follows. First, the self-regulated learning ability has increased by 0.42 point. The point after the self-regulated learning and before it is 3.24 and 3.66 respectively. Second, cognitive regulation, motivational regulation and behavioral regulation have also increased. Out of them, cognitive control has increased the most. Metacognitive strategy is higher than cognitive strategy. In conclusion, the result shows that the on-line pre-learning is helpful to develop the self-regulated learning ability and it is also suitable to teaching-learning method for junior college.

• 공학교육연구
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• 제13권2호
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• pp.78-82
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• 2010

This paper introduces the Tokushima Robot Programming Club. This is a robot manufacturing class for elementary and junior-high school students. This club is planned and managed by university students. First, we show the organization of our club. And, robot kits and software development systems we use are introduced. And then, we describe the activities of this club and show its educational effectiveness for both the children and the university students.

• 한국환경과학회지
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• 제2권1호
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• pp.9.2-19
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• 1993

A laboratory study was conducted to investigate the immobilization of the laboratory waste sludge, mainly from chemical oxygen demand (COD) waste, using cementitious binders. The binders were: Ordinary Portland Cement (OPC), and lime-Rice Husk Ash (RHA) cement. The economic evaluation was done for three different kinds of cementitious binders, namely, OPC, Portaind Rice Husk Ash Cement (PRHAC) which contained rice husk ash U percent by dry weight, and lime-RHA cement. The result showed that lime-RHA cement was the cheapest. The applicability of Freundlich's desorption isotherm was studied to assess the teachability of sludges. The teachability of cement mortars was found to follow the desorption isotherms. Therefore, it was concluded that based on this test, the leachate concentrations of the solidified heavy metals could be predicted, approximately by the Freundlich's isotherm desorption modeling.

• 대한공업교육학회지
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• 제33권2호
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• pp.26-43
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• 2008

이 연구는 공업고등학교 졸업생이 대학의 동일계 학과에 진학했을 때 동일 과목 학점 인정에 관한 전문가의 인식을 조사하는 데 목적이 있다. 오늘날 대학 교육이 일반화되면서 공업고등학교 졸업생의 80% 정도가 대학에 진학하고 있다. 그러므로 공업고등학교와 전문대학, 4년제 공과대학이 연계 교육 차원에서 동일 과목 학점 인정은 교육적 낭비를 줄이기 위해 필요하다. 이 연구에서는 공업교육 분야 전문가인 공업고등학교 교사, 연구원, 전문대학 및 4년제 공과대학 교수 100명을 대상으로 설문 조사하여 84명이 응답하였으며 응답률은 81,25%였다. 이 연구에서 얻어진 결과를 요약하면 다음과 같다. 첫째, 공업고등학교 교사와 연구원은 공업고등학교 졸업생이 대학의 동일 학과에 진학했을 때 공업고등학교에서 이수한 모든 실습 과목 학점은 인정해 주는 것이 타당하다고 한 반면 전문대학과 4년제 대학 교수는 응답자의 대부분이 바람직하지 않다는 반응을 보였다. 둘째, 공업고등학교 졸업생이 전문대학 또는 4년제 공과대학 동일 학과에 입학했을 때 동일 과목은 대학 자체 소정의 시험을 거쳐 학점을 인정해 주는 것을 연구원과 4년제 대학 교수는 대부분 동의하였으나 전문대학 교수는 62.5%가 반대하였다. 셋째, 공업고등학교 졸업생이 전문대학 동일 학과를 졸업하고 4년제 공과대학 동일학과 3학년에 편입했을 때에 동일 과목은 4년제 대학 자체 인증 시험 성적이 일정 수준 이상일 때 학점 인정을 해 주는 것을 응답자 대부분이 동의하였다. 그러므로 이와 같은 경우에는 학점 인정을 해 주는 것이 타당하다.