• International Journal of Internet, Broadcasting and Communication
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• 제6권2호
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• pp.13-16
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• 2014

This study aims to examine the effects of watching 2D and 3D images on the blink rate. Regarding the image watch, their blink rate for 2D and 3D images was separately checked for 1 minute in the 1m distance, before the watch, after 15 minutes of watch, and after 30 minutes of watch. About the change of their blink rate in the 2D image watch, it tended to become higher than that before watching the image; however, there was no statistical significance (paired t-test, p=0.106, p=0.062). And in the 2D image watch, it tended to increase in comparison between after 15 minutes and after 30 minutes, but there was no statistical significance (paired t-test, p=0.623). Meanwhile, about the change of their blink rate in the 3D image watch, it tended to decrease statistically significantly both after 15 minutes and after 30 minutes when compared with that before watching the image (paired t-test, p=0.000, p=0.000). In the 3D image watch, it tended to increase in comparison between after 15 minutes and after 30 minutes; however, there was no statistical significance (paired t-test, p=0.867).

• 한국안광학회지
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• 제19권1호
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• pp.105-109
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• 2014

목적: 본 연구는 낮은 조도에서 1시간 동안 스마트폰을 시청 한 이후 시력변화와 NIBUT를 비교하였다. 방법: 20대(평균나이 $20.7{\pm}2.4$세)의 안질환이 없고 건강한 눈을 가진 50명(남자 22명, 여자 28명)을 대상으로 실험을 하였다. 낮은 조도(0 lx)에서 스마트폰(Galaxy 2, Samsung, KOREA)을 시청 전과 한 시간 시청 후의 타각적 굴절이상도 검사, 원거리 교정 시력과 NIBUT를 측정하였다. 타각적 측정은 Auto-chart Project(CP-1000, Dongyang, Korea), Phoropter(VT-20, Dongyang, Korea), Auto refractor-keratometer(MRK-3100, Huvitz, Korea)를 이용하였다. 결과: 낮은 조도에서 스마트폰을 시청하기 전과 한 시간 시청 후의 굴절이상도의 변화는 $-3.20{\pm}2.00$ D에서 $-3.38{\pm}2.00$ D로 변화했고(p=0.006), 원거리 교정시력의 변화는 $0.93{\pm}0.08$에서 $0.91{\pm}0.10$으로 변화했으며(p=0.000), NIBUT의 변화는 $10.48{\pm}7.00$ 초에서 $10.29{\pm}6.47$ 초로 변화했다(p=0.761). 결론: 낮은 조도에서 스마트폰을 지속적으로 시청하는 것은 일시적인 원거리 시력의 변화를 초래하였고, 적절한 휴식은 원거리 시력과 눈물 안정성에 미치는 영향을 줄여줄 것으로 사료된다.

• 한국융합학회논문지
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• 제10권7호
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• pp.373-381
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• 2019

2017년 우리나라는 고령사회에 진입하면서 치매환자가 증가하고 있다. 이에 추후, 간호 전문 인력으로 역할을 수행하게 될 간호대학생의 치매노인에 대한 관심이 필요하다. 본 연구의 목적은 간호대학생의 치매노인에 대한 사회적 거리감에 미치는 영향요인을 알아보기 위함이다. 본 연구는 서술적 조사연구 연구로, 자료 수집을 위해 D시의 일개 간호대학 158명을 대상으로 구조화된 설문지를 통해 자료를 수집하여 분석하였다. 각 변수간의 상관관계를 분석한 결과 치매노인에 대한 사회적 거리감과 치매태도(r=.53, p<.001)는 정적인 상관관계를 보였으며, 연령주의(r=-.41, p<.001)는 부적상관관계가 있는 것으로 나타났다. 간호대학생의 치매노인의 사회적 거리감에 미치는 영향요인으로는 치매환자와의 소통경험에서 '전혀 없다' 에 비해 '가끔 있다' 와 (${\beta}=.29$ p=.012), '자주 있다' (${\beta}=.37$ p=.002)가 영향요인으로 나타났고, 치매조기예방에 대한 관심(${\beta}=.32$ p=.002), 연령주의(${\beta}=.36$ p=.002)가 유의한 영향을 미치는 것으로 나타났다. 이러한 영향요인 변수들의 치매노인에 대한 사회적 거리감에 대한 설명력은 41.0% 이었다.

• 제어로봇시스템학회논문지
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• 제21권4호
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• pp.367-371
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• 2015

In this paper, a novel localization method for a monocular camera is proposed by using a feature-based probabilistic map. The localization of a camera is generally estimated from 3D-to-2D correspondences between a 3D map and an image plane through the PnP algorithm. In the computer vision communities, an accurate 3D map is generated by optimization using a large number of image dataset for camera pose estimation. In robotics communities, a camera pose is estimated by probabilistic approaches with lack of feature. Thus, it needs an extra system because the camera system cannot estimate a full state of the robot pose. Therefore, we propose an accurate localization method for a monocular camera using a probabilistic approach in the case of an insufficient image dataset without any extra system. In our system, features from a probabilistic map are projected into an image plane using linear approximation. By minimizing Mahalanobis distance between the projected features from the probabilistic map and extracted features from a query image, the accurate pose of the monocular camera is estimated from an initial pose obtained by the PnP algorithm. The proposed algorithm is demonstrated through simulations in a 3D space.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2002년도 Proceedings
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• pp.457-460
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• 2002

The image quality of three-dimensional (3D) images has been widely investigated by the qualitative analysis method. A need remains for an objective and quantitative method to assess the image quality of 3D volume-rendered images. The purpose of this study was to evaluate the quantitative accuracy of distance measurements on 3D volume-rendered images of a dry human skull by using multi-detector computed tomography (MDCT). A radiologist measured five times the twenty-one direct measurement line items composed among twelve reference points on the skull surface with a digital vernier caliper. The water filled skull specimen was scanned with a MDCT according to the section thicknesses of 1.25, 2.50, 3.75, and 5.00 mm for helical (high quality; pitch 3:1) scan mode. MDCT data were reconstructed with its acquisition section thickness and with 1.25 mm section thickness for all scans. An observer also measured seven times the corresponding items on 3D volume-rendered images with measuring tools provided by volumetric analysis software. The quantitative accuracy of distance measurements on the 3D volume-rendered images was statistically evaluated (p-value < 0.05) by comparatively analyzing these measurements with the direct distance measurements. The accuracy of distance measurements on the 3D volume-rendered MDCT images acquired with 1.25, 2.50, 3,75 and 5.00 mm section thickness and reconstructed with its section thickness were 48%, 33%, 23%, and 14%, respectively. Meanwhile, there were insignificant statistical differences in accuracy of distance measurements among 3D volume-rendered images reconstructed with 1.25 mm section thickness for the each acquisition section thickness. MDCT images acquired with thick section thickness and reconstructed with thin section thickness in helical scan mode should be effectively used in medical planning of 3D volume-rendered images. The quantitative analysis of distance measurement may be a useful tool for evaluating the quantitative accuracy and the defining optimal parameters of 3D volume-rendered CT images.

• 한국자기공명학회논문지
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• 제20권3호
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• pp.95-101
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• 2016

Apolipoprotein B-100 (Apo-B100) is a major component of low density lipoprotein (LDL). Apo B-100 protein has 4,536 amino acid sequence and these amino acids are classified into peptide groups A to G with subsequent 20 amino acids (P1-P302). The peptide groups were act as immunoglobulin (Ig) antigens which oxidized via malondialdehyde (MDA). The mimetic peptide P1 (EEEMLENVSLVCPKDAT RFK) out of D-group peptides carrying the highest value of IgG antigens were selected for structural studies that may provide antigen specificity. Circular Dichroism (CD) spectra were measured for peptide secondary structure in the range of 190-250 nm. Experimental results show that P1 exhibit partial of ${\beta}-sheet$ and random coil structure. Homonuclear (COSY, TOCSY, NOESY) 2D-NMR experiments were carried out for NMR signal assignments and structure determination for P1. On the basis of these completely assigned NMR spectra and distance data, distance geometry (DG) and Molecular dynamics (MD) were carried out to determine the structures of P1. The proposed structure was selected by comparisons between experimental NOE spectra and back calculated 2D NOE results from determined structure showing acceptable agreement. The total Root-Mean-Square-Deviation (RMSD) value of P1 obtained upon superposition of all atoms was in the range $0.33{\AA}$. The solution state P1 has mixed structure of ${\beta}-sheet$ (Glu[1] to Cys[12]) and random coil (Pro[13] to Lys[20]). These NMR results are well consistent with secondary structure from experimental results of circular dichroism. Structural studies based on NMR may contribute to the studies of atherosclerosis and observed conformational characteristics of apo B-100 in LDL using monoclonal antibodies.

• Journal of Electrical Engineering and Technology
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• 제3권3호
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• pp.363-372
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• 2008

In this paper, knowledge-based approach using Support Vector Machines (SVMs) are used for estimating the coordinated zonal settings of a distance relay. The approach depends on the detailed simulation studies of apparent impedance loci as seen by distance relay during disturbance, considering various operating conditions including fault resistance. In a distance relay, the impedance loci given at the relay location is obtained from extensive transient stability studies. SVMs are used as a pattern classifier for obtaining distance relay co-ordination. The scheme utilizes the apparent impedance values observed during a fault as inputs. An improved performance with the use of SVMs, keeping the reach when faced with different fault conditions as well as system power flow changes, are illustrated with an equivalent 265 bus system of a practical Indian Western Grid.

• 한국안광학회지
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• 제4권1호
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• pp.57-61
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• 1999

경상남도 창녕군과 대구지역 양로원 및 노인복지관을 방문하여 50세 이상 근용안경을 사용하는 사람중 질환이나 기형이 없는 남자 257명, 여자 472명의 근용동공중심간 거리를 측정하고 한천식 근거리 시표를 사용하여 검사거리 35cm에서 교정시력이 0.5일 때의 근용교정 도수를 측정한 결과 근용동공중심간 거리는 평균적으로 남자 58.93mm로 조사되었다. 또한 연령별 교정도수는 연령이 증가할수록 근용굴절력이 증가하는 것으로 조사 되었다.

• 대한교통학회지
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• 제9권1호
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• pp.29-46
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• 1991

The purpose of this study is to develop a parking behavior model in prior step for solv-ing parking problems in Pusan C. B. D. The results of this study are as follows; In the C. B. D of Pusan the peak parking time is between 2 and 3 o'clock P. M., and the average parking duration is 237 minutes. It means the use of parking lots is very ineffi-cient. Hence in order to shorten the parking duration, it is very urgent for drivers to chan-ge parking attitude. The walking distance from the parking lots to his destination is below 300∼500m, so the establishment of parking areas and the arrangement of parking lots in C. B. D should be planned on the base of the above walking distance. The model distinguishing between legal and illegal parking behaviors is derived from the binary decision model. The selected model has the correlation rate, η2=0.505 which is relatively high value This result shows that the detetminating judgement on the legal and illegal parking behavior is influenced mutually such factors as driver's occupation parking purpose monthly income distance to his destination averaged parking duration and age.

• 응용통계연구
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• 제20권3호
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• pp.585-595
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• 2007

Ahn등 (2003)의 P-행렬을 사용한 두 $c^d$-분할표의 변환자료들의 유클리드 거리제곱은 두 분할표의 셀 (cell) 상대도수벡터들 사이의 유클리드 거리 제곱에 비례함을 보이고, PP-자료의 플롯을 현대시분석과 설문자료의 탐색에 사용하는 방법을 제안한다.