• Clinical and Experimental Pediatrics
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• 제51권2호
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• pp.116-121
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• 2008

Unintentional injuries are the most important cause of morbidity and mortality in the pediatric population, and the home is the most common site of injury for children in Korea. The most common cause of injury was slip down. Fall down and burn were frequent in infant/toddlers group, automobile and bicycle accident more frequent in preschool children. Findings from the survey could then be used to provide targets for direct educational efforts by medical services and to direct environmental safety modifications tailored to the unique situation of each family. Pediatric toxic ingestions are treated commonly by pediatricians and emergency physicians. Significant injury after these ingestions is infrequent, but identifying the dangerous ingestion is sometimes a difficult task. By performing a detailed history, focused physical examination, and directed laboratory evaluation, an estimation of risk can be developed. According to recent Korean poison papers, there were bimodal peak of age distribution in poisoned children patient on the whole: infant and adolescents group. Various types of materials belonged the classes of drugs, household products, and industrial solvents. Most of the poisoned children patients had been poisoned accidentally, while most cases of adolescents poisoning had been intentional. More than half of the adolescents group had a suicidal purpose in Korea, so an understanding of the demographic factors associated with self-harm poisoning may provide useful information to improve prevention and treatment strategies.

• Journal of Electrical Engineering and Technology
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• 제7권4호
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• pp.646-651
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• 2012

Meaningful logos or random sequences have been used in the current digital watermarking techniques of 2D bar code. The meaningful logos can not only be created by copyright holders based on their unique information, but are also very effective when representing their copyrights. The random sequences enhance the security of the watermark for verifying one's copyrights against intentional or unintentional attacks. In this paper, we propose a new watermarking technique taking advantage of Data Matrix as well as encryption keys. The Data Matrix not only recovers the original data by an error checking and correction algorithm, even when its high-density data storage and barcode are damaged, but also encrypts the copyright verification information by randomization of the barcode, including ownership keys. Furthermore, the encryption keys and the patterns are used to localize the watermark, and make the watermark robust against attacks, respectively. Through the comparison experiments of the copyright information extracted from the watermark, we can verify that the proposed method has good quality and is robust to various attacks, such as JPEG compression, filtering and resizing.

• 대한수학교육학회지:학교수학
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• 제14권1호
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• pp.151-163
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• 2012

2006개정 교육과정에서 초등수학과의 교수 학습방법으로 학습자의 조작 활동을 통한 탐구방식의 학습이나 교사와 학생이 함께 학습활동 등으로 학습자의 능동적이고 적극적인 활동주의 학습 원리에 따른 학습 효과를 극대화 할 수 있는 방법을 요구하고 있다. 이에 본 연구에서는 초등학교 1학년에서 6학년까지의 수학교과서에 제시된 모든 학습내용에 따른 학습 활동을 10가지의 유형으로 조사한 후에 이를 수와 연산, 도형, 확률과 통계, 측정 그리고 규칙성과 문제해결의 5대 내용영역과 저 중 고학년군의 3개로 나누어 특징을 분석하였다. 그리고 이 결과를 교사들이 단원에 따라 개대되는 활동유형과 비교하고 분석하여 학습지도에 효과적으로 활용하도록 하였다.

• Journal of Positioning, Navigation, and Timing
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• 제2권2호
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• pp.101-108
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• 2013

GPS is the most widely-used Positioning, Navigation, and Timing (PNT) system. Since GPS is an important PNT infrastructure, the vulnerability of GPS to signal jamming has received significant attention. Especially, South Korea has experienced intentional high-power jamming from North Korea for the past three years, and thus realized the necessity of a complementary PNT system. South Korea recently decided to deploy a high-power terrestrial navigation system, eLoran, as a complementary PNT system. According to the plan, the initial operational capability of the Korean eLoran system is expected by 2016, and the full operational capability is expected by 2018. As a necessary research tool to support the Korean eLoran program, an eLoran performance simulation tool for Korea is under development. In this paper, the received signal strength, which is necessary to simulate eLoran performance, from the suggested Korean eLoran transmitters is simulated with the consideration of effective ground conductivities over Korea. Then, eLoran signal-to-noise ratios are also simulated based on atmospheric noise data over Korea. This basic simulation tool will be expanded to estimate the navigation performance (e.g., accuracy, integrity, continuity, and availability) of the Korean eLoran system.

• 경영과정보연구
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• 제1권
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• pp.133-165
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• 1997

In the situation of Korean company today it is considered that the necessity of developing a corporate culture is not only more important than ever, but also indispensable to the organization management in the future. Focused on the development of corporate culture, the purpose of this study is to find out the influence of the direction of corporate culture development on its own strength. The method of this study is the empirical method based on theoretical one with the previous bibliographical studies. It is thought that in viewpoints of the culture pragmatists, the development of corporate culture means the intentional and systematic creation of culture. And, the direction of corporate culture development is thought as the management philosophy a corporate desires, or the desirous direction of corporate culture to express the management policy. According to the results of this study, it is found that the progressive direction of the corporate culture development has the most intensive influence on the various sides. Therefore, the management should research and develop the progressive value of culture more deeply, to get the effective development of corporate culture.

• 한국인터넷방송통신학회논문지
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• 제8권6호
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• pp.9-14
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• 2008

현재 인터넷 통신에 주로 사용하고 있는 x-DSLL 제품에 있어, ADSL은 대략 3.5km의 전송거리를 갖고 VDSL은 2km 이내의 전송거리를 갖는다. 즉, 전화선을 이용한 인터넷 전송속도는 전송선로의 특성상 통신속도와 반비례하여 전송거리가 결정되는 물리적 구조를 갖는다. 인터넷 전송방식에 따른 통신속도를 결정하는 또 다른 요소로 AM방송에 의한 ADSL회선의 속도저하, 단파통신에 의해 VDSL의 전송대역과 중첩되어 속도를 저하 시킨다. 본 연구에서는 Field to cable에 의해 유도된 공중파를 제거시키면서 신호를 증폭 전송대역을 최대로 확보하여 최적거리내 확보된 통신속도로 전송거리를 2배정도 향상시키는 제품개발에 관한 연구결과이다.

• 한국인터넷방송통신학회논문지
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• 제18권3호
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• pp.71-75
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• 2018

본 논문에서는 복호 후 재전송 기반의 중계기 시스템에서 재머를 사용했을 때의 보안 불능 확률을 연구한다. 물리 계층에서 보안 용량을 증가시키기 위해서 선택되지 않은 중계기들 중에서 재머를 선택하여 의도적인 잡음을 발생시키도록 할 수 있다. 재머에 의한 잡음은 수신자와 도청자에서 동일하게 간섭으로 작용하지만 송신자-도청자 링크 간의 채널 품질을 송시자-수신자 링크의 채널보다 더 악화 시키는 최적의 재머를 선택하여 물리 계층 보안을 강화할 수 있다. 본 논문에서는 재머의 유무에 따른 보안 불능 확률의 이론적인 식을 계산하고, 그 식이 타당한지 증명하기 위하여 이론값과 모의실험을 통한 실험값을 비교해 본다.

• 컴퓨터교육학회논문지
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• 제9권3호
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• pp.47-65
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• 2006

본 연구는 탐구과정의 지원방식을 CSILE가 저차원의 기초탐구과정을 지원하는 경우, 고차원의 통합탐구과정을 지원하는 경우, 저차원과 고차원의 탐구과정을 모두 지원하는 경우의 세 가지로 구분하고, 각각의 지원방식이 학습자들의 탐구과정에 어떠한 영향을 주는지 비교, 분석하기 위하여 각 집단의 탐구과정을 모형으로 나타내었다. 집단의 탐구과정을 분석하기 위해서 Strauss와 Corbin[21]의 근거이론을 연구방법으로 하였다. 연구대상은 초등학교 6학년 아동 48명이며, 세 개의 집단에 각각 16명씩 무선 할당하였다. 대상 학습자들은 프로그램 기능 습득 후 4주 동안 탐구과정 지원방식별 CSILE에서 과학과의 지진 단원을 협력 학습하였다. 이러한 과정을 통해 세 가지 환경의 탐구과정에 따른 모형을 도출할 수 있었다.

• 한국실내디자인학회논문집
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• 제27권2호
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• pp.143-153
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• 2018

The exhibition space is a concept that is used to extract only the function of exhibition in an art museum combined with various cultural facilities. It mediates works, audience, and space. Therefore, it is considered that the exhibition space will not only judge the space by the form of the building, but also the true meaning will appear when the exhibition, the space and the environment coexist. His exhibition space has a story from the outside to the inside and the exhibition. In this study, we try to understand the characteristics of his space by analyzing the way of organizing exhibition and exhibition in his exhibition space. As a result of analyzing the cases suggested on this thesis through this point of view, Ando Tadao represented characteristics of his own exhibition space by harmonizing the demand of each exhibition space with his architecture language. His exhibition space provides the experiential space in the harmony of the nature and artificiality as inpouring the nature into the complex traffic line. And, the exhibition is constituted as a result of fully considering the overall situation of the space environment. He tries uniting the space and art by interpreting the work in the space rather than arranging the works. Consequently, It gives visitors the direct space experience through the intentional traffic line and is becoming an exhibition space that can express the exhibition only in that space as constituting it differently in accordance with the character of work.

• 한국의상디자인학회지
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• 제18권2호
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• pp.161-175
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• 2016

Sensitivity has become more important in relation to design in a changing social environment and atmosphere. In the West, the concept of aesthetics has long been established but in the East, only in the seventeenth and eighteenth century China the discussion had begun. In Korea where the first scholarly discussion on aesthetics had begun around 1929, more and more rigorous and theoretical discussions emerge nowadays. Korean beauty consists of unplanned Beauty and unplanned planned Beauty. Japanese beauty consists of the beauty of half-articulation and the beauty of articulation. While both Korea and Japan base their sense of beauty on nature, Korea emphasizes the nature as it is and Japan values the artful decorative elements. In modern Korean fashion, the characteristic Korean aesthetics of unplanned Beauty appears in the various expressive techniques such as the movement with natural gathering, the use of natural materials like cotton, the harmonization of black and white, and simplified silhouette. Also, there are plays on balance and proportion using straight and curves lines and variegated colors and creative printing, intentional asymmetry, and destrution.