• 대한수학회논문집
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• 제21권3호
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• pp.577-586
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• 2006

In this paper we will propose the methods for finding the non-invertible ideals corresponding to non-primitive quadratic forms and clarify the structures of class SEMIGROUPS of imaginary quadratic orders which were given by Zanardo and Zannier [8], and we will give a general algorithm for calculating power of ideals/classes via the Dirichlet composition of quadratic forms which is applicable to cryptography in the class semigroup of imaginary quadratic non-maximal order and revisit the cryptosystem of Kim and Moon [5] using a Zanardo and Zannier [8]'s quantity as their secret key, in order to analyze Jacobson [7]'s revised cryptosystem based on the class semigroup which is an alternative of Kim and Moon [5]'s.

• 공학교육연구
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• 제15권5호
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• pp.19-24
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• 2012

Robots have been attracting students' interest recently. Therefore, they are a good way to motivate to study related subjects. However, there are difficulties in teaching general students because a wide background is required to understand the fundamentals of robotics. In order to teach robotics fundamentals to beginners in a short period, an effective experimental class, including several phased experiments, is proposed in this paper. A portable two-DOF robot arm system with servo motors was developed for experiments, and the operation method based on kinematics was introduced for its operation. The effectiveness of the class was investigated by using a questionnaire after carrying it out in a university class for junior students.

• 공학교육연구
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• 제22권5호
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• pp.13-19
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• 2019

It is important to encourage students who are having difficulty learning mathematics and majors due to lack of basic knowledge, and encourage them to improve their academic performance by focusing on and participating in class. The purpose of this study is to confirm the applicability of the Jigsaw Method by analyzing the change of the learner's academic achievement and the attitude of the learner's mathematics by applying the Jigsaw Model. During the four weeks, the Jigsaw Model was applied to 30 experimental students and the instructor-led lectures were given to 36 students in the comparative group. As a result of the study, it was confirmed that the average of the experimental groups applying the Jigsaw model was higher than the average of the comparative group in the lecture class. The results of the survey showed that the Jigsaw Model increased class concentration and participation, helped self - directed learning, and had high learning satisfaction.

• Educational Technology International
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• 제16권1호
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• pp.31-57
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• 2015

This study aims to understand the overall experiences of students who use notebook computers in class by using a qualitative approach. Interview data were collected from 23 Korean college students at a Korean university, who use notebook computers in their classes; the data were analyzed through the constant comparison method. The results from this study can be categorized into two themes: the positive and negative effects of using a notebook computer in class, and different perspectives on the effects of using a notebook computer in class. The positive effects of notebook computer usage were specified as production of lecture notes, performing searches for information, management of learning materials, and effective time management. However, behaviors such as perusing other works not associated with the class were indicated as negative effects. The participants had different perceptions about the effect of notebook computer usage in increasing academic performance, although they were satisfied in their experience with notebook computers in general. These results imply that appropriate methods of technology usage are needed and that the support of an instructor is essential to achieve fully beneficial use of notebook computers in class.

• 정보과학회 논문지
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• 제42권10호
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• pp.1280-1285
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• 2015

고속 정규표현식 매칭을 수행하기 위한 여러 종류의 정규표현식 매칭 하드웨어 구조가 연구되었다. 특히 프로그램과 같이 패턴의 갱신이 쉽도록 범용 프로세서와 유사한 방식으로 정규표현식 매칭을 수행하는 ReCPU와 SMPU와 같은 정규표현식 프로세서가 연구되었다. 그렇지만 기존의 정규표현식 프로세서들은 문자클래스 매칭을 위한 별도의 기능을 제공하지 않아서 문자클래스 처리에 비효율적이다. 본 논문에서는 문자클래스 매칭을 지원하는 정규표현식 매칭 프로세서의 명령어 집합을 제시하고, 이에 대한 프로세서 구조를 설계 구현한다. 제시된 프로세서는 문자클래스, 문자 범위와 부정 문자클래스 처리 기능을 포함하고 있어서 문자클래스 매칭을 매우 효율적으로 처리할 수 있다.

• 한국초등과학교육학회지:초등과학교육
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• 제33권1호
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• pp.129-139
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• 2014

This study was conducted to examine the effect of elementary science class using name card method on scientific learning motivation and academic achievement of elementary students. Two sixth grade classes were divided into experimental group and comparison group to treat the experimental group with elementary science class using name card method. General class according to teacher manual was implemented for the comparison group. Elementary science class applying name card method was conducted for 10 sessions throughout the experimental period of 8 weeks. The results of this study were as follows. First, elementary science class with name card method was effective in improving scientific learning motivation. Second, elementary science class with name card method had significant effect on improvement of scientific learning academic achievement. The study results showed that elementary science class with name card method was effective for scientific learning motivation and academic achievement of elementary students.

• Journal of Chest Surgery
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• 제24권10호
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• pp.973-978
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• 1991

From January, 1982, to December, 1990, 15 patients underwent pericardiectomy for chronic constrictive pericarditis on Department Of Thoracic and Cardiovascular Surgery, School of Medicine, Pusan National University. There were 9 male and 6 female patients [male to female ratio was 1.5: 1] ranging from 15 years to 63 years old [mean age 35.0]. All patients underwent pericardiectomy through a median sternotomy, partial cardiopulmonary bypass was performed on two patients. There were 3 postoperative death [20%]. Six cases [40%] were tuberculous origin 5 cases [34%] were Idiopathic [nonspecific chronic inflammatory change was considered to idiopathic], 2 cases [13%] were malignant origin, 2 cases [13Yo] were pyogenic origin. Dyspnea on exertion was evident in all patients and abdominal distention, general weakness, palpitation, peripheral edema were found. Eleven patients showed low voltage of QRS wave, 7 patients showed diffuse ST-T wave change, 2 patients showed atrial fibrillation on EKG. There were 6 patient showed pericardial thickening, 5 patients showed evidence of restriction, 5 patients showed pericardial effusion, 4 patients showed low cardiac output on preoperative echocardiogram. Hemodynamic response to pericardiectomy were observed; preoperative CVP 26.8 cmH2O declined to 15.0 cmH2O. Preoperative NYHA Functional class showed class II - 1, class III - 10, class IV - 4, postoperative NYHA functional class showed class I - 7, class II - 4, class Ill - l.

• 한국치위생학회지
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• 제21권4호
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• pp.481-489
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• 2021

Objectives: This study was conducted to understand the effect of learners' self-determination on class participation, focusing on the feedback type of educators. Methods: A survey was conducted from May 1 to May 31 2021 on dental hygiene students, and a total of 151 valid responses were analyzed. The questionnaire consisted of general characteristics, self-determination, class participation, and educator's feedback type. The analysis method used correlation analysis and hierarchical regression analysis. Results: In relation to self-determination, class participation, and feedback type of educators, self-determination was positive feedback (r=0.338, p<0.01), class participation was corrective feedback (r=0.418, p<0.01), and positive feedback was correction (r=0.742, p<0.01). As a result of the mediating effect of the educator's feedback type in the relationship between self-determination and class participation, it was found to be significant by partially mediating positive and corrective feedback. Conclusions: It was found that the right to self-determination influences class participation based on positive feedback and corrective feedback of educators. It relates to efforts to strengthen learners' self-determination and provide appropriate types of feedback from educators.

• 공학교육연구
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• 제25권6호
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• pp.38-46
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• 2022

In order to improve students' interest, class participation and class comprehension in engineering theory classes, a class applying review games as Jinjinga, Bingo, etc. were designed and developed. Through applying them to three engineering theory subjects, the specific effects of the strategy on students' understanding, interest, participation, and academic achievement were analyzed and the usefulness of each review game strategy was analyzed. Analyzing class data over the past 11 years, there was a clear correlation between performance of the students in the review game and their actual grades, which was found to be greater than the negative effect of absence rate on the test performance or grades. This study also researched students' perceptions compared to other general subjects not applying the review games. The results of a survey of the students who took the review game class showed the usual amount of usual studying hours increased, the burden of examination or the amount of studying hours for preparing the exam was reduced, and the class interest and achievement significantly increased compared to other subjects in the same major.

• 과학교육연구지
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• 제46권3호
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• pp.293-311
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• 2022

본 연구는 분자생물학 기초 소양 함양을 위한 제한 효소 지도 작성의 탐구실험을 구성하였고, 일반계 고등학교 2학년을 대상으로 학생 중심의 제한 효소 지도 작성 탐구실험 수업을 통해 탐구실험 능력과 과학긍정경험에 미치는 영향을 분석하였다. 우선, 탐구실험 수업이 일반계 고등학생의 과학긍정경험에 있어 '그렇다' 이상으로 응답한 비율이 사전에 비해 사후에서 높은 것으로 보아 유의미하게 효과가 있는 것으로 나타났다. 제한 효소 지도 작성을 위한 연속의 5단계로 구성하여 적용한 결과 학생들의 과학 분야 학업에 대한 흥미 유발뿐만 아니라 학생들의 수업 참여도가 높아졌고, 구체적인 과학 학습 동기, 과학 진로 포부 및 체험 자료로도 효과적인 것으로 나타났다. 탐구실험 수업의 과학 환경이 학생들의 학습 태도와 과학긍정경험의 향상으로 이어져 수업의 집중과 수업의 질적 향상, 학생간의 적극적인 의사 소통과 상호 협력의 중요성에 긍정적인 영향을 끼쳤다. 또 탐구실험 수업이 진로 체험의 기회를 제공함으로써 분자생물학의 기초 소양 함양과 이공계 진학의 토대가 될 것이다.