• 한국지능시스템학회논문지
• /
• 제26권2호
• /
• pp.160-167
• /
• 2016

본 논문은 천장 영상 정보를 이용한 이동 로봇 위치추정 방법을 제안한다. 지도상에 천장 영상의 랜드 마크의 위치는 미리 알고 있지만, 지도상의 랜드 마크와 감지된 랜드 마크 사이의 대응관계 정보는 주어지지 않는다. 단지, 로봇의 이동 시작 단계에서 랜드 마크들에 대한 상대적인 로봇의 위치가 주어진다. 로봇의 위치 및 천장 영상에서 감지된 특징점의 ID를 찾기 위해 파티클 필터 방법을 이용한다. 제안한 방법을 천장에 동일한 형태의 원형 랜드 마크를 가진 실내 환경에서 실험하여 성능을 검증하였다. 본 논문에서 제안한 위치추정 방법은 레이저 영역 센서에 의해 측정된 벽까지의 거리 또는 RF 나 초음파에 의해 측정된 비이컨까지의 거리 값에 큰 불확실성이 존재하는 물류 창고와 같은 환경에서 사용하기에 적합하다.

• 한국임상보건과학회지
• /
• 제3권1호
• /
• pp.276-289
• /
• 2015

Purpose. To efficiently manage hospitals, this study aims to analyze the general characteristics, common-type balance sheet, common-type profit and loss statement and financial ratio of a tertiary general hospital and use the results as basic data for future hospital development by comprehending causes for problems and analyzing hospital management. Methods. By using information about a tertiary general hospital, located in A Metropolitan City, provided through Alio (www.alio.go.kr), a public organization information provider, Health Insurance Review & Assessment Service, and Ministry of Health and Welfare, this study used data during 3 years(2011 to 2013) by analyzing the general characteristics, common-type balance sheet, common-type profit and loss statement, industrial mean ratio and financial ratio of hospitals. Results. This study came to the following conclusions through the general characteristics, common-type balance sheet, common-type profit and loss statement, industrial mean ratio, financial ratio, circular chart and ROI by analyzing the data from 2011 to 2013. Conclusions. Overall, A Tertiary General Hospital showed an increase in fixed cost due to the construction of J Hospital and even in the size of capital and assets. It also showed an increase in medical profit, but the increase of its medical cost was higher, resulting in a financial loss. Especially, this hospital showed a slight decrease in net profit, featuring a reduction in inventory turnover. When the management of A Tertiary General Hospital was predicted based on such features, this hospital is expected to improve its profit structure through the opening of J Hospital, and it is necessary for this hospital to increase and sustain the turnover rate of inventories accumulated by managing them better.

• 한국멀티미디어학회논문지
• /
• 제2권3호
• /
• pp.265-276
• /
• 1999

주문형 비디오 시스템은 향후 도래할 멸티미디어 서비스 시대의 핵심 응용 분야이다. 본 연구에서는 최큰 엔터프라이즈나 연구용으로 각광받고 있는 Linux 커널상에서 저가형 PC 클러스터 링 환경을 구축하여 호스트 단위로 확장 가능한 VOD시스템(SVOD : Scalable VOD)을 설계 및 구현하였다. 본 연구의 주요 기여는 다음과 같다. 첫째, MPEG과 같은 연속매체를 서비스하기 위해서 기존의 텍스트용 Linux Ext2 파일시스템을 디스크 배열상에서 VOD전용으로 개발하였다. 둘째, 호스트 단위로 확장가능하도록 스트립 서버를 구축하였다. 셋째, 클라이 언트는 마이크로소프트 DirectShow$\circledR$SCOM (Component Object ModeJ)을 이용하여 하드웨 어 지원없이 소프트웨어 디코더를 구현하였다 넷째, 서버와 클라이언트 사이의 흐름제어를 이용하여 클라이 언트 버퍼의 Overflow와 Underflow 발생을 억제하고, 이를 통한 FF(Fast Forward) VCR연산을 제공한다 연구결과, 저가의 PC서버와 무료 운영체제인 Linux상에서 쓰레드 기반의 확장가능한 VOD시스템 개발이 가능하였다.

• 정보처리학회논문지B
• /
• 제9B권3호
• /
• pp.369-374
• /
• 2002

본 논문에서는 명암도 변화값과 기하학적 패턴벡터를 이용하여 실시간으로 차량번호판을 추출하고 인식하는 알고리즘을 제안하였다. 일반적으로 차량영상에서는 번호판 영역에서 문자와 배경이 뚜렷하게 구별되고, 일정한 명암도 변화를 가지면서 번호판 이외의 다른 영역보다 밀집도가 높은 특성이 있다. 따라서 본 논문에서는 이러한 성질을 이용하여 먼저 명암도 변화값을 사용하여 번호판을 추출하도록 하였으며 영상 입력과정에서 외부 환경에 따라 차량영상이 어둡거나 밝게 입력될 경우에도 동일한 추출 성능을 얻기 위하여 밝기 보정 과정을 수행하였다. 또한 추출된 번호판 영역으로부터 입력 문자의 크기, 이동 및 회전에 무관한 특성 추출을 위해 번호판 영역에서 잡음 제거와 세선화를 적용하여 전처리후 제안한 기하학적 패턴벡터를 이용하여 차량번호를 인식하도록 하였다. 제안한 방법들을 적용한 결과 기존의 원형 패턴벡터 보다 계산 속도가 빠르며, 차량번호판의 크기와 잡음에 무관하며, 불규칙한 조명 상태에서도 정확한 차량 번호를 인식할 수 있었다.

• Journal of Information Processing Systems
• /
• 제14권2호
• /
• pp.469-486
• /
• 2018

We propose an enhanced version of the local binary pattern (LBP) operator for texture extraction in images in the context of image retrieval. The novelty of our proposal is based on the observation that the LBP exploits only the lowest kind of local information through the global histogram. However, such global Histograms reflect only the statistical distribution of the various LBP codes in the image. The block based LBP, which uses local histograms of the LBP, was one of few tentative to catch higher level textural information. We believe that important local and useful information in between the two levels is just ignored by the two schemas. The newly developed method: gradual locality integration of binary patterns (GLIBP) is a novel attempt to catch as much local information as possible, in a gradual fashion. Indeed, GLIBP aggregates the texture features present in grayscale images extracted by LBP through a complex structure. The used framework is comprised of a multitude of ellipse-shaped regions that are arranged in circular-concentric forms of increasing size. The framework of ellipses is in fact derived from a simple parameterized generator. In addition, the elliptic forms allow targeting texture directionality, which is a very useful property in texture characterization. In addition, the general framework of ellipses allows for taking into account the spatial information (specifically rotation). The effectiveness of GLIBP was investigated on the Corel-1K (Wang) dataset. It was also compared to published works including the very effective DLEP. Results show significant higher or comparable performance of GLIBP with regard to the other methods, which qualifies it as a good tool for scene images retrieval.

• Journal of Electrical Engineering and Technology
• /
• 제10권4호
• /
• pp.1726-1733
• /
• 2015

In order to study the effect of the high-altitude and dusty weather in northwest of China on the corona characteristics of transmission lines, a corona caged based experimental system with sandy and dusty flow condition is numerically investigated and designed. This system overcomes the difficulties caused by harsh environment and offers easy usage for off-site tests. The design parameters are mainly determined by the characteristics of strong sandstorm in northwest region and test requirements. By the comparison of numerical simulation of the particle diffusion in four programs with rectangular or circular air-duct, a practical technology, which introduces swirl to control the particle diffusion length, is obtained. Accordingly, the structure of round air-duct with swirl elbow in inlet and outlet of high level segment is selected as final program. Systems of control and measurement are designed at the same time. Field tuning results show that the test system could ensure the range of sandy and dusty coverage. The wind speed, sandy and dusty concentration could be controlled and meet the requirements of accuracy. The experimental system has many features, such as simple structure, easy to be assembled, disassembled, transported and operated, small space occupied.

• Journal of Microbiology and Biotechnology
• /
• 제27권5호
• /
• pp.943-946
• /
• 2017

Although the genus Leuconostoc, generally found in various fermented foods, has often been suggested to be a novel probiotic for food fermentation and health promotion, the strains in this genus showed low acid tolerance and low osmotic stress resistance activities, which are required for survival during food fermentation events. Recently, a novel species of Weissella, W. jogaejeotgali $FOL01^T$ (= KCCM 43128 = JCM 30580), was isolated from Korean fermented clams. To determine the genomic features of this new species, its genome was completely sequenced and analyzed. The genome consists of a circular chromosome of 2,114,163 bp of DNA with a G+C content of 38.8%, and the plasmid pFOL01 consists of 35,382 bp of DNA with a G+C content of 39.1%. The genome analysis showed its potential for use in food fermentation and osmotic stress resistance abilities for processing in food industries. In addition, this strain was predicted to have acid tolerance and adhesion to the mucosal layer for survival and colonization in the gut. Subsequent experiments substantiated these abilities, suggesting that W. jogaejeotgali may have probiotic potential and a high survival rate during food fermentation. Therefore, it may be suitable as a novel probiotic strain for various applications in food industries.

• 대한전자공학회논문지SP
• /
• 제48권3호
• /
• pp.90-98
• /
• 2011

전 세계적으로 벼 병충해의 인식과 분류는 농업현장에서 기술적 경제적으로 중요한 요소이다. 컴퓨터 비젼 기술은 벼 병충해를 진단하고 곡물의 효율적인 관리에 유용하다. 영역 분할은 벼 병충해를 조기에 정확하게 탐지하는데 매우 중요한 기술이다. 가우시안 평균기법을 이용한 새로운 벼 병충해 분할 방식을 다양한 색체공간에서 제안하였다. 사용 색체공간에 따라 벼 병충해의 분할에 따른 성능은 달라질 것이다. 따라서, 이 수치연구는 어느 색체공간이 벼 병충해를 분할하는데 최적한지를 결정할 목적으로 수행되었다. 본 연구는 NTSC, CIE, YCbCr, HSV, 그리고 정규화 RGB의 5개의 색체공간을 다루었다. 연구 결과는 YCbCr 색체공간이 98%의 정확도로 벼 병충해 영역을 최적으로 분할하는 것을 보여주었다. 또한 제안하는 방법은 벼 병충해의 영역을 자동화에 의하여 강건하게 분할할 수 있다는 것을 증명하였다.

• Bulletin of the Korean Chemical Society
• /
• 제35권6호
• /
• pp.1713-1719
• /
• 2014

1FSD is a 28-residue designed protein with a ${\beta}{\beta}{\alpha}$ motif. Since this protein displays most essential features of protein structures in such a small size, this model protein can be an outstanding system for evaluating the balance in the propensity of the secondary structures and the quality of all-atom protein force fields. Particularly, this protein would be difficult to fold to its correct native structure without establishing proper balances between the secondary structure elements in all-atom energy functions. In this work, a series of the recently optimized five amber protein force fields [$ff03^*$, $f99sb^*$-ildn, ff99sb-${\phi}^{\prime}$-ildn, ff99sb-nmr1-ildn, ff99sb-${\Phi}{\Psi}$(G24, CS)-ildn] were investigated for the simulations of 1FSD using a conventional molecular dynamics (MD) and a biased-exchange meta-dynamics (BEMD) methods. Among those tested force fields, we found that ff99sb-nmr1-ildn and ff99sb-${\Phi}{\Psi}$(G24, CS)-ildn are promising in that both force fields can locate the native state of 1FSD with a high accuracy (backbone rmsd ${\leq}1.7{\AA}$) in the global free energy minimum basin with a reasonable energetics conforming to a previous circular dichroism (CD) experiment. Furthermore, both force fields led to a common set of two distinct folding pathways with a heterogeneous nature of the transition state to the folding. We anticipate that these force fields are reasonably well balanced, thereby transferable to many other protein folds.

• Journal of electromagnetic engineering and science
• /
• 제13권3호
• /
• pp.178-185
• /
• 2013

This paper introduces a high-efficiency, high-gain, broadband quasi-Yagi antenna, and its four-element array for use in 60-GHz wireless communications. The antenna was fed by a microstrip-to-slotline transition consisting of a curved microstripline and a circular slot to allow broadband characteristics. A corrugated ground plane was employed as a reflector to improve the gains in the low-frequency region of the operation bandwidth, and consequently, to reduce variation. The single antenna yielded an impedance bandwidth of 49 to 69 GHz for $|S_{11}|$ <-10dB and a gain of >12.0 dBi while the array exhibited a bandwidth of 52 to 68 GHz and a gain greater than 15.0 dBi. Both proposed designs had small gain variations (${\pm}0.5$ dBi) and high radiation efficiency (>95%) in the 60-GHz bands. The features of the proposed antenna were validated by designing, fabricating, and testing a scaled-up configuration of the single antenna at the 15-GHz band. The measurements resulted in an impedance bandwidth of 13.0 to 17.5 GHz for $|S_{11}|$ <-10dB, a gain of 10.1 to 13.2 dBi, and radiation efficiency in excess of 88% within this bandwidth. Additionally, the 15-GHz antenna yielded quite symmetric radiation profiles in both E- and H-planes, with a high front-to-back ratio.