• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권12호
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• pp.4492-4507
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• 2021

In camera sensor networks (CSNs), in order to better identify the point, full-view problem requires capture any facing direction of target (point or intruder), and its coverage prediction and sensor density issues are more complicated. At present, a lot of research supposes that a large number of homogeneous camera sensors are randomly distributed in a bounded square monitoring region to obtain full-view rate which is close to 1. In this paper, we deduce the sensor density prediction model in heterogeneous deployed CSNs with arbitrary full-view rate. Aiming to reduce the influence of boundary effect, we introduce the concepts of expanded monitoring region and maximum detection area. Besides, in order to verify the performance of the proposed sensor density model, we carried out different scenarios in simulation experiments to verify the theoretical results. The simulation results indicate that the proposed model can effectively predict the sensor density with arbitrary full-view rate.

• 한국과학교육학회지
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• 제27권9호
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• pp.809-817
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• 2007

이 연구의 목적은 과학교사 및 고등학생들의 과학의 본성에 대한 관점을 10학년 과학 교과서에서 표현된 관점과 함께 탐색해 보는 것이다. 연구대상은 경북에 위치한 고등학교의 과학교사 1명과,10학년 남학생 18명,여학생 11명이다. 연구에서 과학의 본성에 해당하는 3가지 주요 영역인 과학의 정의,과학의 발달,과학적 방법을 중심으로 자료를 분석하였다. 연구결과,과학의 정의 영역에서 교과서는 귀납주의적 관점을 나타내었고,교사는 반증주의적 관점을 나타내었다. 그러나 수업에서 교사는 교과서대로 귀납주의적 관점을 학생들에게 제시하였고,이 수업을 들은 학생들의 관점도 귀납주의로 나타났다. 과학의 발달 영역에서 교과서는 짧은 지면을 할애하여 상대주의적 관점을 나타내고,교사의 관점도 상대주의로 분석되었으나,교과서의 내용처럼 교사의 설명도 매우 간략한 형태로 학생들에게 제시되었다. 수업을 받은 학생들의 관점은 교사의 수업이나 교과서의 영향을 받지 않은 귀납주의로 나타났다. 과학적 방법 영역에서 교과서와 교사가 반증주의적 관점을 가지고 있으며,수업에서도 반증주의적 관점이 나타내었다. 그 수업 후 학생들의 관점 또한 반증주의적 관점으로 나타났다. 그러나 학생들의 사고가 수업의 영향을 받는지에 대한 구체적인 증거는 추후 연구에서 이루어질 필요가 있다.

• 제어로봇시스템학회논문지
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• 제19권10호
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• pp.886-890
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• 2013

In this paper, a 3D coordinates acquisition method for a mechanical assembly is developed by using multiview X-ray images. The multi-view X-ray images of an object are obtained by a rotary table. From the rotation transformation, it is possible to obtain the 3D coordinates of corresponding edge points on multi-view X-ray images by triangulation. The edge detection algorithm in this paper is based on the attenuation characteristic of the X-ray. The 3D coordinates of the object points are represented on a graphic display, which is used for the inspection of a mechanical assembly.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1996년도 Proceedings International Workshop on New Video Media Technology
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• pp.18-21
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• 1996

In the field of Virtual Reality, many studies have been reported. Especially, there are many studies on generating virtual creatures on computer systems. In this paper we propose an algorithm to automatically generate 3D fish models from 2D images which are printed in illustrated books, pictures or handwritings. At first, 2D fish images are captured by means of image scanner. Next, the fish image is separated from background and segmented to several parts such as body, anal fin, dorsal fin, ectoral fin and ventral fin using the proposed method“Active Balloon model”. After that, users choose front view model and top view model among six samples, respectively. 3D model is automatically generated from separated body, fins and the above two view models. The number of patches is decreased without any influence on the accuracy of the generated 3D model to reduce the time cost when texture mapping is applied. Finally, we can get any kinds of 3D fish models.

• 한국과학교육학회지
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• 제13권3호
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• pp.377-388
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• 1993

This research was developed to investigate the apprehension of the ideal image of science teacher and the view of science teaching profession. The samples were drawn from middle/high schools students, university students of colleges of education, science teachers of secondary schools. principals of middle schools and masters of high schools, and professors majoring in science and/or science education. Data were collected through the use of questionaires. The samples responded differently to the Questions depending on their personal needs and professional viewpoints. Very few of the students wanted to be a science teacher in the future. Even the many numbers of college students gave up becoming a science teacher. Furthermore greater portion of science teachers were not satisfied with their profession as science teaching. More findings are described in the paper.

• 한국과학교육학회지
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• 제27권8호
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• pp.693-698
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• 2007

Science hands-on exhibits are increasingly popular, especially during vacation time. These exhibits hire guides to help visitors to understand the contents. In this study, the qualifications of the guides are investigated through interviews with the producers who run the exhibit. There were two main questions the researcher was interested in during the interviews. One was the importance of the science background of the guides. The second was the characteristics of guides that the producers consider important for successful exhibits. The results show that a science background is not an important qualification in the view of most of the producers. Many factors other than science, such as accountability or social skills, were considered to be of greater importance than a background in science.

• 한국과학교육학회지
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• 제17권2호
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• pp.119-125
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• 1997

In the last few years, there has been a significant growth of interest in how the philosophy of science can be related to science education. Adequate understanding of the philosophy and history of science can promote understanding of the nature of science in teacher and student. The 6th curriculum in Korea has also placed emphasis upon understanding of the nature of science. From this point of view, to ensure effective school science education it is necessary to investigate how teachers and students are understanding the nature of science. To do this 45 secondary science teachers and 191 students of 7 schools in Seoul are administered Nott and Wellington's questionaire(1993). This questionaire is consisted of 24 Likert Scale statements and asks questions on 5 subscales of philosophy of science :Relativism-Positivism, Inductivism-Deductivism, Contextualism-Decontextualism, Instrumentalism-Realism, Thinking science education as a Process or a Content. The results of this study are as follows : 1. Teachers' view of the nature of science was relativism, deductivism, decontextualism and instrumentalism. And they thought process is more important than content in science education. 2. There was no difference in teachers' conceptions on the nature of science according to experience and gender. 3. Students' view of the nature of science was relativism, deductivism, decontextualism and instrumentalism. And they thought process is more important than content in science education. 4. There was no difference in students' conceptions on the nature of science according to schools level(middle vs high) and gender. But, female students exhibited higher score than male students on deductivism(p<.05). 5. Teachers' and students' conception of the nature of science was in agreement with each other.

• 한국정보통신학회논문지
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• 제19권3호
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• pp.708-714
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• 2015

컴퓨터 언어를 배우는 학습자는 텍스트 기반으로 된 프로그래밍을 매우 어렵다고 생각하며, 객체 지향 프로그래밍 학습에서도 어려움을 호소한다. 이러한 문제를 해결하기 위한 방법이 객체 지향 시각 프로그래밍을 프로그래밍 교육에 도입하는 것이다. 이 논문에서는 프로그래밍 교육에서 이러한 문제를 해결하기 위해 객체지향 모델링을 지원하기 위해 UML을 도입하고 시각 프로그래밍 방법론으로서 객체지향 프로그래밍을 지원하는 LabVIEW OOP를 사용하여 학습자들에게 프로그래밍 교육을 수행하는 방법을 제시한다. 또한, 이 교육 방법론을 내장형 프로그래밍 교육에 적용하는 방안을 제안하며, 제시된 프로그래밍 교육 방법에 대해 설문조사를 실시하여 교육적인 효과를 분석한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.855-856
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• 2008

In this paper, we studied the performance evaluation of a vehicular rear-view camera through quantifying the image quality based on several objective criteria from the ISO (International Organization for Standardization). In addition, various experimental environments are defined considering the conditions under which a rear-view camera may need to operate. The process for evaluating the performance of a rear-view camera is composed of five objective criteria: noise test, resolution test, OECF (opto-electronic conversion function) test, color characterization test, and pincushion and barrel distortion tests. The proposed image quality quantification method then expresses the results of each test as a single value, allowing easy evaluation.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.76-79
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• 2009

This paper investigates the performance of a vehicular rear-view camera through quantifying the image quality based on several objective criteria from the ISO (International Organization for Standardization). In addition, various experimental environments are defined considering the conditions under which a rear-view camera may need to operate. The process for evaluating the performance of a rear-view camera is composed of five objective criteria: noise test, resolution test, OECF (opto-electronic conversion function) test, color characterization test, and pincushion and barrel distortion tests. The proposed image quality quantification method then expresses the results of each test as a single value, allowing easy evaluation. In experiments, the performance evaluation results are analyzed and compared with those for a regular digital camera.