• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.8
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• pp.942-949
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• 2016

Efficient routing protocols designed for Wireless Sensor Networks (WSN) can be extended and applied to Internet of Things (IoT) data routing, as IoT can be considered to be an extension from WSN. When the size of the data in IoT is often bigger than in conventional WSNs, existing cluster routing protocol such as LEACH may cause high data loss rate due to its incomplete load balancing. We present an enhanced LEACH-based protocol which can minimize the data loss which is an important performance measure in IoT. In our proposed protocol, the base station estimates the location of nodes by the trilateration technique to make sure optimal number of cluster heads and members in a deterministic manner. We evaluate our proposed protocol via computer simulations in terms of data loss rate and average network lifetime.

• The Korean Journal of Ecology
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• v.16 no.4
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• pp.417-428
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• 1993

Branching growth pattern of Mugnolza denuduta is likely to be originated from two growth strategies: environment overcoming strategy and life maintenance strategy, which coexist in a tree. Growth rate of branches was strongly correlated with relative light intensity (P<0.001) and physical contact (P<0.01), however there is no significant correlation between growth rate and direction of branch. When relative light intensity is less than 1%, the growth was restricted by physical contact with the surrounding branches. In contrast, the growth was rarely restricted by physical contact when relative light intensitiy was 10% or more. The branching rate was significantly affected by the presence or absence of physical contact (P<0.05), but it was not significantly affected by relative light intensity nor by the direction of branch. In the beginning stage of the growth, the ratio of the material allocation from main branch to subbranch was large and varied with the influence of surrounding environment. These various growth rates, which implicate a variety of material allocation ratios (0.16~0.98), affect branch growth pattern through the optimum growth strategies. The growth and arrangement of branches of Magnolia denudata display the solar collectors to maximize the total amount of energy absorbed and to overcome the restriction of the environment.

• 대한예방의학회:학술대회논문집
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• 2001.04a
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• pp.1-26
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• 2001

국가 보건의료체계(health care system)가 올바르게 기능하기 위해서는 의료체계를 구성하는 각 요소들간의 유기적인 상호 작용이 대단히 중요하다. 정보체계는 이러한 유기적인 상호 작용을 위해 보건의료체계의 각 영역에서 꼭 필요한 시스템이다. 보건의료 서비스를 효율적으로 생산하기 위해서 투입하는 자원의 개발과 배치 체계는 물론 생산된 보건의료 서비스를 소비자가 효과적으로 이용할 수 있도록 하는 서비스 전달체계(delivery system)의 전과정에서 보건의료정보체계는 중요한 인프라가 되고 있다. 정보체계는 궁극적으로 보건의료체계가 지향하는 목적을 달성할 수 있도록 짜여져야 한다. 다시 말해, 의료체계의 각 하부영역에서 의료이용의 접근성(accessibility), 형평성(equity), 서비스의 의과학적 질(scientific technical quality), 포괄성(comprehensiveness) 등 보건의료체계가 추구하는 가치를 정보체계에서도 그대로 담아 낼 수 있어야 한다. 또한 정보체계를 구축하기 위한 요건으로 각 사업 영역별 표준화, 사업 영역간의 상호관계, 공공과 민간의 역할 분담, 정보 관련 시선과 인력, 정보기술 등의 인프라, 각 사업 영역별 정보화에서 담아야 할 정보 내용(contents, DB) 등에 대한 사전 기획이 수립되어야 한다. 그 동안 보건의료분야의 정보화사업은 1996년부터 보건소기관의 행정, 진료, 보건 업무지원을 위한 보건소정보화사업과, 1995년부터 초고속공공응용서비스 사업의 일환으로 추진해 온 전염병, 혈액유통, 장기이식, 외래진료예약, 원격진료, 응급의료, 원격치매진료 시스템 구축사업 등이 있으며, 응급의료, 혈액관리, 장기이식, 전염병정보, 외래진료예약시스템을 통합한 보건의료정보통합서비스시스템(1998년) 구축사업 등이 있었다. 이러한 사업들에 대해 현재 평가되고 있는 문제점들로는 정보화 사업에 대한 전략과 비젼이 부재한 상태에서 지나치게 정보기술 중심으로 추진되다 보니 보건의료 정보의 공유나 활용이 전혀 이루어지지 않거나 매우 제한적이었고, 시범사업의 경우는 초기 사업을 추진하기 위한 주체가 명확하지 않았고, 관련 인력의 훈련과 양성이 안 되었으며, 사업 확대를 위한 법적 기반의 취약, 정보화 사업이 부실한 데 대한 평가 기준과 대안 제시 등이 매우 취약한 것이 문제점으로 나타났다. 특히, 정보 내용과 DB 구축을 위한 표준화 등에 대한 사전 설계 부재는 개발된 정보시스템의 운영을 결정적으로 어렵게 만든 요인이 되고 있다. 전반적으로 기존의 정보화사업은 사업 추진을 위해서 꼭 필요한 비젼 수립, 비젼에 따른 목표 설정, 전략 개발, 관리체계 구축, 운영방안 수립 등 단계적인 정보화 계획이 부재한 것으로 평가되고 있어 보건의료정보체계 구축을 위한 종합 비젼 기획(ISP)이 시급한 실정이다.

• Archives of design research
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• v.17 no.2
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• pp.261-268
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• 2004

The Colonial House is one of the most popular styles in America. The purpose of this study is to closely examine this style based on interior features classified by patterns and elements during America's colonial period. Results of this study show that the interior style of the Colonial House was, at first, similar to Europe style. It was then integrated into the Georgian style of England and affected by Palladio as time passed. The interior style of the American Colonial House was based on rationality and practicality in concern with American weather and regions rather than imitation. The side of the roof was clapboard and the windows arranged with symmetry and rules around the entrance hall. It was generally Palladian style and was decorated with classical details. Timber frame of the interior was based on log cabins that appeared early in the American immigration. Furniture styles such as Jacobian, Queen Ann and Chippendale were matched with unique wood-oriented details and folkways like Chest, Rush Chair and Windsor Chair The house was also decorated with pictures, mirrors and ornaments, etc.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.165-170
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• 2003

This paper presents an integrated approach to unconstrained face recognition in arbitrary scenes. The front end of the system comprises of a scale and pose tolerant face detector. Scale normalization is achieved through novel combination of a skin color segmentation and log-polar mapping procedure. Principal component analysis is used with the multi-view approach proposed in[10] to handle the pose variations. For a given color input image, the detector encloses a face in a complex scene within a circular boundary and indicates the position of the nose. Next, for recognition, a radial grid mapping centered on the nose yields a feature vector within the circular boundary. As the width of the color segmented region provides an estimated size for the face, the extracted feature vector is scale normalized by the estimated size. The feature vector is input to a trained neural network classifier for face identification. The system was evaluated using a database of 20 person's faces with varying scale and pose obtained on different complex backgrounds. The performance of the face recognizer was also quite good except for sensitivity to small scale face images. The integrated system achieved average recognition rates of 87% to 92%.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.2
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• pp.473-480
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• 2013

In this paper, location recognition algorithm is developed to improve the accuracy using improve Trilateration. The location recognition algorithm is first calculate the location refer to the measured signal power. Error can be occurred when measure distance with arranged node in specific location. If the distance data is received from node (receiver, coordinator), Node selected for location calculation is defined through section. If the distance data is received from node (receiver, coordinator), Node selected for location calculation is defined through section. Second, we apply algorithm of section filtering. If there are 4 sections in node, we consider 1 section to 6 location recognition coordinates. A special characteristic drawback of RF is that the actual distance is actually farther than the calculated received distance data. This is error is incurred when the signal strength increases. We reduce the location recognition error by applying an improved algorithm as secondary after filtering primary through section filtering.

• Proceedings of the KAIS Fall Conference
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• 2010.11a
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• pp.28-31
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• 2010

충청남도 서해안은 생태환경의 보고로서 갯벌, 사구, 해안습지 등 독특한 자연적 특성을 갖고 있는 지역이다. 그러나 다른 지역에 비해 대규모 간척 및 매립으로 인한 해양생태계 피해에 현저히 노출되어 있고, 최근 산업화 및 관광권화가 진행되고 있으며 해안선 침식 방지를 위한 연안정비사업으로 각종 연안 방호구조물이 건설되었다. 이 중 가장 많이 건설된 연안 호안구조물은 배후지역의 안정성 확보, 해안도로의 건설 등 다양한 목적으로 축조되었다. 그러나 성장위주의 경제정책으로 연안 호안구조물이 무분별하게 설치되어 파도와 호안 구조물의 접촉 시 호안구조물이 파랑을 견디지 못해 사면피복재가 산란되어 외관상 주변 환경을 해칠 뿐만아니라 2차 피해까지 야기 시킬 우려가 있다. 본 연구에서는 호안구조물의 리모델링을 통해 안정성을 증대시키기 위해 서해 연안지역의 4개 시 군 29개 지점을 대상으로 호안구조물 현황에 대해 조사하고 호안구조물의 리모델링을 통해 붕괴된 지역을 대상으로 파랑에 대해 안정한 사석재 소요질량을 호안구조물의 경사 별로 산정하여 비교하였다. 피복재 소요질량 산정을 위한 설계파고는 유의파고를 적용하였으며, 산정공식은 허드슨공식(Hudson, 1959)을 사용하였다. 추가적으로 사석 층의 두께와 단위면적당 수용해야할 사석재의 개수를 산정하여 호안구조물 설계 시 사석재의 배치를 용이하게 할 수 있도록 하였다. 본 연구에서 산정된 값들은 초기설계로서 파랑에 안정한 호안구조물의 설계 조건 중 일부분으로 호안구조물의 최종 설계 시 조파실험을 통하여 안정성을 검증 해야 할 것으로 판단된다.

• Journal of the Korean Society for Library and Information Science
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• v.42 no.3
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• pp.301-323
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• 2008

There has been significant movements in the provision of equal access to library and information services for persons with disability. This study aimed to analyze the use and needs of library services of disabled people with a survey. The survey data revealed that the majority of disabled persons did not visit library and not experience library sol-vices. The main reason was reported that they had poor information about the library services. Also, they did not satisfy the variety, sufficiency, accessibility, up-to-dateness of the materials in general. And there were difference of favorite programs and needs among different kinds of the disabled. Therefore, active guidance and public relations about library services. improvement of accessibility for the disabled by building digital collection, resource sharing and extension of services by building library cooperation network, and the arrangement of librarians for the disabled and education for them should be back up for improving library services for the disabled.

• Cartoon and Animation Studies
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• s.24
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• pp.49-64
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• 2011

Comics is sequential art. In comics, the story is developped by its sequential panels which have their own sizes and sites. Accordingly, comics is closer to 'space' art than text. The reading order in a page of comic book follows the human long-standing reading habit, and it is the same as that of textbook. When we read a korean comic book, our eyes run from left to right, and downward on the page. But some factors related to panels or comic structures can change the typical reading order. Meanwhile, breaking the typical reading order is easier in the "infinite canvas" by reason of unconstrained spatial composition. This paper introduces the factors that change the comic book readers' reading order and proposes a tablet PC comic book layout which includes an arbitrary reading path using interaction

• Journal of the Korean Society for Aviation and Aeronautics
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• v.28 no.2
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• pp.53-62
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• 2020

This study is to evaluate the accuracy of the meteorological information provided for the aircraft operating at low altitude. At first, it is necessary to identify crucial elements of weather information closely related to flight safety during low altitude flights. The study conducted a survey of pilots of low altitude aircraft, divided into pre-flight and in-flight phases, and reached an opinion that wind direction, wind speed, cloud coverage and ceiling and visibility are important items. Related to these items, we compared and calculated the accuracy of TAFs and METARs from Taean Airfield, Seosan Airport and Gunsan Airport because of their high number of domestic low-altitude flights. Accuracy analysis evaluated the accuracy of two numerical variables, Mean Absolute Error(MAE) and Root Mean Square Error(RMSE), and the cloud coverage which is categorical variable was calculated and compared by accuracy. For numeric variables, one-way ANOVA, which is a parameter-test, was approached to identify differences between actual forecast values and observations based on absolute errors for each item derived from the results of MAE and RMSE accuracy analyses. To determine the satisfaction of both normality assumptions and equivalence variability assumptions, the Shapiro-Wilk test was performed to verify that they do not have a normality distribution for numerical variables, and for the non-parametric test, Kruscal-Wallis test was conducted to determine whether or not they are satisfied.