• 한국정보과학회논문지:소프트웨어및응용
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• 제32권5호
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• pp.449-460
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• 2005

본 논문에서는 고정된 카메라로부터 획득된 색상 비디오 프레임에서 조명변화와 겹침으로 인한 왜곡에 강건하게 다수의 사람을 추적하는 방법을 제안한다. 조명변화에 따른 외형변화의 문제점을 해결하기 위하여 시간 비종속적인 본래(intrinsic) 영상을 이용하여 프레임에 존재하는 조명을 제거하며, 매 프레임마다 조명 영상을 적응적으로 갱신한다. 카메라 내에서 사람을 추적하기 위해 색상정보를 포함하는 계충적 사람모델을 사용함으로써 겹침의 문제를 해결한다. 추적된 사람모델은 사람모델 리스트에 저장되어 해당되는 사람이 카메라에서 사라진 후에도 일정 기간 보존됨으로써, 재등장한 사람의 정보를 복원할 수 있다. 본 논문에서 제안하는 적응적 모델기반 방법은 실내${\cdot}$외 영상을 대상으로 여러 시나리오로 실험되어, 조명변화로 왜곡된 사람의 색상정보를 옳게 보정하였을 뿐만 아니라 사람들이 겹치거나 헤어진 후에도 성공적으로 추적하였음을 확인하였다.

• 한국지형학회지
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• 제24권3호
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• pp.149-159
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• 2017

Coastal dunes have many environmental and ecological socio-economic importances; various human activities, however, have impaired their structures and functions over the years. In 2016, environmental survey on coastal sand dune was carried out to report the present status and update the coastal sand dune list in 2001. This research analyzed the survey data in terms of geomorphological and socio-economic aspects. A list of the 189 coastal sand dune and information was updated by province. A 36.5% reduction in coastal sand dune area have been identified for using agricultural land, development area since the approximately 1940-50s. Development area in coastal sand dune covered small area as 5%, the use intensity was relatively hard. Furthermore, the difference by province also showed. Approximately 80% of the development area was concentrated in 20% of total sand dune several sand dune. It is generally accepted that coastal sand dunes were exposed high development pressure. However the result means that the general brief dose not apply for all sand dune. Therefore, characteristics of each sand dune should be analyzed and concerned the diverse management plans.

• 정보보호학회논문지
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• 제20권2호
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• pp.73-90
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• 2010

최근 Tan 등은 인증 서버와 연결 없이 태그 인증 목록을 가진 이동형 리더가 스스로 태그를 인증할 수 있는 서버없는 RFID 검색 프로토콜을 소개하였다. 서버없는 RFID 시스템은 기존 온라인 서버 모델과 달리 리더의 이동성 및 개인성을 고려해야하기 때문에 태그 뿐 아니라 리더의 프라이버시 보호가 필요하다. 본 논문에서는 서버없는 RFID 검색 시스템을 위한 새로운 보안 요구사항을 정의하고 이를 만족하는 안전한 RFID 검색 시스템을 제안한다. 제안하는 검색 프로토콜은 리더에 저장된 태그의 인증 정보를 매 세션마다 갱신하여 리더의 후방향 위치추적 안전성을 보장하며 검색 프로토콜의 취약점인 재전송 공격을 막기 위해 암호화된 타임스탬프를 사용하였다. 또한 본 논문에서는 서버 없는 RFID 검색 시스템의 분석을 위한 새로운 공격자 모델을 정의하고 이를 이용하여 시스템의 안전성을 증명한다.

• 한국임상약학회지
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• 제26권1호
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• pp.84-95
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• 2016

Objective: Atrial fibrillation (AF) guidelines have been published in the USA and Europe. Recently, the USA and Europe have updated their guidelines, respectively. These new AF guidelines help in addressing key management issues in clinical situations. This study, therefore, systematically compared guidelines for rate and rhythm control pharmacotherapy of patients with AF between the USA (American College of Cardiology and American Heart Association, ACC/AHA) and Europe (European Society of Cardiology, ESC). Methods: This study investigated and compared American guidelines (2014) and European guidelines (2010 and 2012). Results: Generally, there are four meaningful differences between ACC/AHA and ESC guidelines. Important differences are treatment classification system, level of recommendation, drug list, and dosage. In addition, ACC/AHA described pharmacokinetic drug interactions for antiarrhythmic drugs. ESC emphasized ECG and atrioventricular nodal slowing as feature of antiarrhythmic drugs. Conclusion: This research addresses important use of anti-arrhythmic drugs and movement to accept recent recommendations in Korea. For the successful application of the guidelines, a role of pharmacists is crucial in clinical situation.

• 대한안전경영과학회지
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• 제12권3호
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• pp.107-119
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• 2010

The aim of this study was to compare the carcinogen classification systems of developed countries or global organizations with domestic system under Industrial Safety and Health Act (ISHA). We selected the representative institutions which had carcinogen classification system such as International Agency for Research on Cancer (IARC), National Toxicological Program (NTP), Environmental Protection Agency (US-EPA), American Conference of Governmental Industrial Hygienists (ACGIH), and European Union (EU). We collected the carcinogen lists issued by 5 institutions, and merged by CAS number of each chemical with Microsoft Access 7.0. We found that confirmed human carcinogens, probable human carcinogens and possible human carcinogens were 34, 179, and 252, respectively. All of the institutions classified chemicals as 2 (NTP), 3 (EU) or 5 (IARC, ACGIH, US-EPA) categories based on the weight of scientific evidences for carcinogenicity and periodically updated the carcinogen list by regular procedure. However, a total of 90 chemicals could be classified as carcinogen under ISHA in Korea. There was no procedure or system which periodically update the carcinogen lists. In addition, the status of carcinogen classification according to regulation was confused. In conclusion, these findings suggest that the carcinogen classification and management system should be amended by consideration of systems of advanced institutions and the domestic regulation system.

• 천문학회지
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• 제45권6호
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• pp.139-146
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• 2012

We investigate the properties of OH, SiO, and $H_2O$ maser emission in O-rich AGB stars. We use a sample of 3373 objects, which is an updated version of the list of O-rich AGB stars presented in Suh & Kwon (2011). We divide the 3373 O-rich AGB stars into four different groups based on the maser emission: OH maser sources (1533), SiO sources (1627), $H_2O$ sources (452), and sources with no maser (610). To understand the nature of the maser sources, we present various infrared two-color diagrams (2CDs) using IRAS, 2MASS, and AKARI data. For each group, we compare the positions on various infrared 2CDs with theoretical models. We find that the OH maser sources generally show larger color indices and larger dust optical depths than SiO or $H_2O$ sources. We suggest that the differences of the color indices for different maser sources are due to different mass-loss rates and dust formation processes.

• Journal of Communications and Networks
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• 제6권1호
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• pp.19-25
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• 2004

In this paper, we present a trellis-based blind channel estimation and equalization technique coupling two kinds of adaptive Viterbi algorithms. First, the initial blind channel estimation is accomplished by incorporating the list parallel Viterbi algorithm with the least mean square (LMS) updating approach. In this operation, multiple trellis mappings are preserved simultaneously and ranked in terms of path metrics. Equivalently, multiple channel estimates are maintained and updated once a single symbol is received. Second, the best channel estimate from the above operation will be adopted to set up the whole trellis. The conventional adaptive Viterbi algorithm is then applied to detect the signal and further update the channel estimate alternately. A small delay is introduced for the symbol detection and the decision feedback to smooth the noise impact. An automatic switch between the above two operations is also proposed by exploiting the evolution of path metrics and the linear constraint inherent in the trellis mapping. Simulation has shown an overall excellent performance of the proposed scheme in terms of mean square error (MSE) for channel estimation, robustness to the initial channel guess, computational complexity, and channel equalization.

• Korean Journal of Radiology
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• 제22권8호
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• pp.1379-1396
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• 2021

Rare neurovascular diseases (RNVDs) have not been well-recognized in Korea. They involve the central nervous system and greatly affect the patients' lives. However, these diseases are difficult to diagnose and treat due to their rarity and incurability. We established a list of RNVDs by referring to the previous literature and databases worldwide to better understand the diseases and their current management status. We categorized 68 RNVDs based on their pathophysiology and clinical manifestations and estimated the prevalence of each disease in Korea. Recent advances in genetic, molecular, and developmental research have enabled further understanding of these RNVDs. Herein, we review each disease, while considering its classification based on updated pathologic mechanisms, and discuss the management status of RNVD in Korea.

• Korean Journal of Radiology
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• 제24권11호
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• pp.1114-1130
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• 2023

Magnetic resonance neurography (MRN) is increasingly used to visualize peripheral nerves in vivo. However, the implementation and interpretation of MRN in the brachial and lumbosacral plexi are challenging because of the anatomical complexity and technical limitations. The purpose of this article was to review the clinical context of MRN, describe advanced magnetic resonance (MR) techniques for plexus imaging, and list the general categories of utility of MRN with pertinent imaging examples. The selection and optimization of MR sequences are centered on the homogeneous suppression of fat and blood vessels while enhancing the visibility of the plexus and its branches. Standard 2D fast spin-echo sequences are essential to assess morphology and signal intensity of nerves. Moreover, nerve-selective 3D isotropic images allow improved visualization of nerves and multiplanar reconstruction along their course. Diffusion-weighted and diffusion-tensor images offer microscopic and functional insights into peripheral nerves. The interpretation of MRN in the brachial and lumbosacral plexi should be based on a thorough understanding of their anatomy and pathophysiology. Anatomical landmarks assist in identifying brachial and lumbosacral plexus components of interest. Thus, understanding the varying patterns of nerve abnormalities facilitates the interpretation of aberrant findings.

• 한국자원식물학회지
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• 제37권2호
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• pp.171-202
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• 2024

전 세계 수목원 및 표본관이 보유하고 있는 식물 유전자원 현황 및 정보 공유체계를 효과적으로 활용한다면, 현재 물리적으로 접근이 어려운 북한지역의 생물다양성 보전체계를 구축할 수 있을 것으로 생각된다. 본 연구는 북한에 자생하지만, 국내(남한)에는 자생하지 않는 식물들에 대한 학명을 검토하고 국내·외 수목원의 유전자원 보유 현황을 파악하기 위해 수행되었다. 북한식물 목록 선정을 위해 한반도 관속식물과 관련한 문헌이나 온라인 식물 종 데이터베이스를 참고하여 재배 및 외래식물 여부, 이명, 분포 범위 등을 검토하였으며, Botanic Gardens Conservation International Plant Database와 각 수목원의 Index Seminum을 활용하여 북한식물에 대한 전 세계 수목원의 유전자원 보유 현황을 파악하였다. 64과, 236속, 449종, 13아종, 21변종, 1품종, 2교잡종 등 486분류군에 대한 북한식물 목록을 선정하였으며 희귀식물, 특산식물, 북방계식물 등의 여부를 확인하였다. 전 세계 5개 대륙, 46개 국가, 333곳의 수목원 및 식물 연구기관에서 53과 190속 384분류군의 북한식물 유전자원을 보유 중인 것으로 확인하였다. 북한 지역과의 지리적 근접성, 과거 식물학자의 이동 등의 요인으로 한국, 일본, 러시아 등 동북아시아 국가가 보유하고 있는 북한식물 유전자원 종 다양성이 상대적으로 높은 것으로 확인된다. 본 연구는 북한 자생식물 종 목록 구축 및 응용을 도모하여 한반도 생물 다양성 보전을 위한 과학적 기반 마련과 글로벌 거버넌스 구축에 이바지할 것으로 생각된다.