• Current Optics and Photonics
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• 제7권4호
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• pp.408-418
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• 2023

Due to the technological limitations of infrared thermography, infrared focal plane array (IFPA) imaging exhibits stripe non-uniformity, which is typically fixed pattern noise that changes over time and temperature on top of existing non-uniformities. This paper proposes a stripe non-uniformity correction algorithm based on scene-adaptive nonlinear filtering. The algorithm first uses a nonlinear filter to remove single-column non-uniformities and calculates the actual residual with respect to the original image. Then, the current residual is obtained by using the predicted residual from the previous frame and the actual residual. Finally, we adaptively calculate the gain and bias coefficients according to global motion parameters to reduce artifacts. Experimental results show that the proposed algorithm protects image edges to a certain extent, converges fast, has high quality, and effectively removes column stripes and non-uniform random noise compared to other adaptive correction algorithms.

• 디자인학연구
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• 제12권4호
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• pp.191-200
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• 1999

아이디어를 개발하고 창의적으로 문제를 해결하는 디자인적 자질은 초등학교의 일반교과과정에서부터 개발되는 것이 바람직하다. 개념적 사고와 인지능력을 발달시키는 초등학교 디자인 교육은 '디자인을 위한 교육(education for design)'이 아니라, '디자인에 의한 교육(education by design)'의 성격을 가진다. 이것은 디자인의 기본 개념을 학생들이 자연스럽게 이해하고 그 행위과정을 경험할 수 있도록 도와주는 개념이다. 따라서 초등학교 디자인 교육계에서는 디자인 관련 행위(Design-related activities), 또는 디자인을 기초로 한 교육(Design-Based Education)이라는 용어를 사용하고 있다. 이러한 개념에서의 디자인 교육은 미술 뿐 아니라 수학, 기초 과학, 음악, 역사 등 다양한 주제 내용에 응용될 수 있다. 본 연구에서는 초등학교 디자인 교과과정을 구성하기 위한 틀로서 '내용 영역'과 '행동 유형'을 살펴본다. 이것은 미적.상징적, 실용적.기능적, 과학적.공학적 영역 등과, '알다', '인지하다', '탐구하다' 등의 행동 유형으로 고찰되며, 이를 바탕으로 하여 국내 초등학교 디자인 교육의 현황을 교과서와 설문조사를 통해 분석한다. 이에 대한 발견점은 문제해결과 관련된 과학적.공학적 영역의 내용과 탐구 행동 관련 내용이 상대적으로 적으며, 창의적 표현의 기회와 수용에 대한 수업계획 및 교육방법에 문제점 등이 제기되었다. 초등학교 디자인 교육은 미술교육의 한 부분을 넘어 다양한 영역과 행동들을 포괄하는 협동적 개념의 교육으로 구성되어야 한다.

• 한국학교수학회논문집
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• 제11권4호
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• pp.629-654
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• 2008

최근 들어 새롭게 개정된 미국 조지아주 수학과 교육과정을 소개하고, 이의 이해를 보다 심도 있게 도모하기 위하여 우리나라 제7차 수학과 교육과정 수정안과 비교 분석하고자 하였다. 그러나, 미국 조지아주 수학과 교육과정 전체를 한 번에 다루기에는 그 양이 너무나 방대하여, 본 고에서는 '수와 연산' 및 '대수' 영역(우리나라의 '수와 연산', '문자와 식', '규칙성' 또는 '함수'에 해당)을 중심으로 다루고자 하였다. 본고에서는 두 나라간의 교육과정 내용의 양질에 관한 우위를 가리거나 우리나라 교육과정의 문제점 내지 개선책을 마련하기 보다는 수학 교육 관련 전문가인 독자들로 하여금 대수 영역 관련의 내용에 관하여 두 나라 간에 어떠한 차이가 있는지 살펴보고 음미해 볼 수 있는 근간을 제공하고자 하였다. 또한, 본 고에 제시된 연구 결과를 비롯하여 향후 여러 나라의 수학과 교육과정을 보다 심도 있게 연구하고, 앞으로 우리나라 수학과 교육과정을 개정하는 데에 기초 자료로 활용되기를 기대한다.

• 디지털융복합연구
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• 제12권4호
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• pp.265-276
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• 2014

본 연구는 변화하는 IT 환경에 따른 디자인 교육의 혁신 요구에 주목하여, 인터랙티브 디자인 분야의 학문적 가능성과 대학에서의 교육방안을 제시함으로서, 매체 및 기술의 변동에 따른 디자인 교육의 합리적인 방향성을 모색하였다. 본 연구는 사회적 요구에 따라 인터랙티브 디자인을 통한 고부가가치를 얻기 위해서는 그에 따른 연구와 학문적 기반이 갖추어져야 할 것이며, 특히, 대학에서의 독립적인 학문 영역 토대를 마련하고, 관련 교육과정의 구축이 선행되어야 할 것이라는 인식에 따라, 그 교육적 방향성을 제시하였다는데 의의가 있다. 본 연구를 통해 인터랙티브 디자인의 독자적 학문영역 구축의 필요성을 언급하였으며, 학문적으로 인터랙티브 디자인의 개념과 범위를 정립하였다. 인터랙티브 디자인학의 영역은 전통적인 기술만을 가르치는 것으로는 충분하지 않다. 따라서 전통적 디자인 교육의 보편적 한계를 넘어선 기술적 이해를 요구하면서, 복합적인 이슈를 다룰 수 있어야 할 것이며, 그에 따른 차별화된 교육방법의 모색이 요구된다.

• Geomechanics and Engineering
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• 제23권3호
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• pp.227-244
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• 2020

Earthen structures have an excellent bioclimatic performance, but they are vulnerable against earthquakes. In order to investigate the edification process and costs, a full-scale rammed soil house was constructed in 2004. In 2016-2019, it was studied its seismic damage, durability and degradation process. During 2004-2016, the house presented a relatively good seismic performance (M_w=5.6-6.4). The damaged cover contributed in the fast deterioration of walls. In 2018 it was observed a partial collapse of one wall due to recent seismicity (M_w=5.6-6.1). The 15-year-old samples presented a reduced compressive strength (0.040 MPa) and a minimum moisture (1.38%). It is estimated that the existing house has approximately a remaining 20% of compressive strength with a degradation of about 5.4% (0.0109 MPa) per year (considering a time frame of 15 years) if compared to the new soil samples (0.2028 MPa, 3.52% of moisture). This correlation between moisture and compressive strength degradation was compared with the study of new soil samples at the same construction site and compared against the extracted samples from the 15-year-old house. At 7-14-days, the specimens presented a similar compressive strength as the degraded ones, but different moisture. Conversely, the 60-days specimens shown almost five times more strength as the existing samples for a similar moisture. It was observed in new rammed soil that the lower the water content, the higher the compressive/shear strength.

• 디자인학연구
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• 제20권1호
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• pp.203-218
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• 2007

CAD 테크놀로지는 새로운 디자인 사고나 조형 원리를 촉진시킬 가능성을 내재하고 있는 것은 아닐까? 본 논문은 이러한 의문에서 출발해, 모델링 인터페이스라는 개념을 분석의 수단으로 삼아 투시도법과 CAD 프로그램의 사회적 구성을 살펴보고자 한다. 본 논문은 내용은 다음과 같다. 첫 번째, 르네상스 이후 투시도법이 그리기 중심의 모델링 인터페이스로 자리잡는 과정, 그리고 투시도법의 기하학적 원리가 신재료의 등장으로 현실 공간으로 확산되고, 미적 담론의 차원에서 정당화되는 과정을 논의한다. 두 번째, 컴퓨터를 사용한 모델링 인터페이스가 등장하는 역사적 맥락을 살펴보고, CAD 프로그램이 새로운 모델링 알고리듬과 그래픽 유저 인터페이스의 개발을 거치면서 컴퓨터를 통한 디자인을 실현하는 과정을 검토한다. 특히 본 논문은 이 두 가지 모델링 인터페이스가 구성되는 역사적 경로를 추적하면서, 개별 모델링 인터페이스가 디자인 행위와 맺게 되는 관계, 그리고 그 관계 내부에서 구성되는 디자이너의 인지 양식과 조형 논리의 변모를 분석한다.

• Structural Engineering and Mechanics
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• 제49권4호
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• pp.427-448
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• 2014

At present, the time of easy oil and gas is over. Now, the largest part of fossil fuels is concentrated in the deepest levels of tectonic structures and in the sea shelves. One of the most cumbersome operations of their extraction is the bore-hole drilling. In connection with austere tectonic and climate conditions, their drivage every so often is associated with great and diversified technological difficulties causing emergencies on frequent occasions. As a rule, they are linked with drill string accidents. A key role in prediction of these situations should play methods of theoretical modelling. For this reason, there is a growing need for development and implementation of new numerical methods for computer simulation of critical and post-critical behavior of drill strings (DSs). In this paper, the processes of non-linear deforming of a DS in cylindrical cavity of a deep bore-hole are considered. On the basis of the theory of curvilinear flexible rods, non-linear constitutive differential equations are deduced. The effects of the longitudinal non-uniform preloading, action of torque and interaction between the DS and the bore-hole surface are taken into account. Owing to the use of curvilinear coordinates in the constraining cylindrical surface and a specially chosen concomitant reference frame, it became possible to separate the desired variables and to reduce the total order of the equation system. To solve it, the method of continuation the solution by parameter and the transfer matrix technique are applied. As a result of the completed numerical analysis, the critical states of the DS loading in the cylindrical channels of inclined bore-holes are found. It is shown that the modes of the post-critical deforming of the DS are associated with its irregular spiral curving prevailing in the zone of bottom-hole-assembly. The possibility of invariant state generation during post-critical deforming is established, condition of its bifurcation is formulated. It is shown that infinite variety of loads can correspond to one geometrical configuration of the DS. They differ each from other by contact force functions.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2002년도 Proceedings
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• pp.28-31
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• 2002

Filmless full-PACS in korea has rapidly been growing, since government had supported collaborative PACS project between industry and university hospital in late of 1995. At the same time, a small company had started PACS business, while the Korea PACS society was being formed. In the beginning, PACS societies had focused on developing peripheral solutions such as DICOM gateway for image acquisition, x-ray film digitizer, and viewing software for research or management of personal image data, while Samsung Medical Center had started installing an imported partial PACS system which had recently upgraded with a new system. In similar time frame, a few hospitals had started developing and installing domestic large scale full-PACS system. Several years later, many hospitals have installed full-PACS system with national policy of reimbursement for PACS exams in November 1999. It is believed that Korea is the first country that adopted PACS reimbursement for filmless full-PACS as a national policy. Both experiences of full-PACS installation and national policy generated tremendous intellectual and technological expertise about PACS at all levels, clinical, hospital management, education, and industrial sectors. There are currently three types of PACS system which includes domestic, imported, and hybrid PACS system with imported solution for core system and domestic solution for peripheral system. There are more than 20 domestic PACS companies and they have now enough experiences so that they are capable of installing a truly full-PACS system for large-scale teaching hospitals. PACS societies in Korea understand how to design, implement, install, manage, sustain, and provide good services for large-scale full-PACS. PACS society has also strength for the highest integration technology of the Hospital Information. However, further understanding and timely implementation of continuously evolving international standard and integrated healthcare enterprise concepts may be necessary for international leading of PACS technologies for the future.

• 조형예술학연구
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• 제8권
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• pp.185-210
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• 2005

Closely connecting Well-Being culture with our traditional eating culture. we can predict next generation Kimchi refrigerator trend with this research. In the highly developing industrial society, design has been playing the central role in the managerial strategy of a company and has been one of the central agendas in determining the economical competence of a country, and has also been regarded as a means to acquire sustainable superior competence. Thus, these trends suggest that the aesthetic value of product has become more important than its technological function. In this study we reviewed theoretically esthetic factors influencing the preference and the evaluation of a product and made a list of eight esthetic factors based on various referential studies which include simplicity, balance, unity, rhythm, style, novelty, typicality, and proportion. Also on the point of view of design, it is necessary to find out definitely the consumer preference frame the relationship among design preference design image design attribute. Will give you guidelines on which designers can select and design some more objective and reliable design factors, finding out the relation of cause and effect by which they can know what kind of product designs their consumers like and how the popular image which that product offer is composed of. We investigated the esthetic factors affecting consumers preferences and the basis for evaluating a product. Aimed at providing materials for developing product design by presenting an ,esthetic guideline product design by presenting an esthetic guideline and to put these materials to practical use. Investigated other considered elements classified by manufactures and importance of esthetic factors and its influence on consumer tastes . All of these result, It could not conclude all of the adjective design image and design factors of every consumer, but through consumer reaction framework consumer are response and prefer the products which design image have. and then understand prefered design image are influenced to design factor's and could be apply to new design development.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권3호
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• pp.869-885
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• 2012

The purpose of this study is to present innovative approaches for u-Learning environment in public education with Digital Textbook. The Korean Government has been making efforts to introduce the u-Learning environment to maximize the learning effect in public education with Digital Textbook. However, there are only a few studies that analyze the effectiveness of u-Learning environment and Digital Textbook. This paper reviews the current status of u-Learning environment in Korea and analyzes the satisfaction level with Digital Textbooks. The first survey regarding technological factors was collected from 197 students. The results of the survey revealed that the level of satisfaction has declined over a year. The weakness of the study is that the sample frame is insufficient and survey questions did not reflect diverse factors of learning effectiveness. To supplement these shortcomings, 2,226 students were asked about learning performance. The results of the survey showed that the satisfaction with Digital Textbooks is much higher than that of paper textbooks. However, this paper is limited to u-Learning environments in public education. Therefore, research needs to be improved by reflecting both public and private sectors of education in following studies. This paper suggests useful guidelines to educators in improving their u-Learning environment.