• KSII Transactions on Internet and Information Systems (TIIS)
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• v.13 no.1
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• pp.291-304
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• 2019

This paper proposes a dynamic-tiling-based bandwidth-efficient (DTBE) virtual reality (VR) streaming scheme. We consider 360-degree VR contents with multiple view points such as the front, back, upper, and bottom sides. At a given time, the focus of a client is always bound to a certain view among multiple view points. By utilizing this perspective, under our proposed scheme, tiles with high encoding rates are selectively assigned to the focused view where multiple view points consist of multiple tiles with different encoding rates. The other tiles with low encoding rates are assigned to the remaining view points. Furthermore, for reducing view adaptation delay, we design a novel rapid view adaptation mechanism that selectively delivers an I-frame during view point updates by using frame indexing. We implement the proposed scheme on a commercial VR test bed where we adopt the MPEG media transport (MMT) standard with high-efficiency video coding (HEVC) tile modes. The measurement-based experiments show that the proposed scheme achieves an average data usage reduction of almost 65.2% as well as average view adaptation delay reduction of almost 57.7%.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2006.11a
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• pp.242-247
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• 2006

This study is intended to analyze the characteristics of the preference according to the locations of view points, which are the current criteria for the evaluation of the view. To this end, a total of fifty one test cases according to view point locations were sampled based on the picture data collected in previous studies, and preference assessment was conducted on these cases to identify preference characteristics, where a five-point Lickert-scale evaluation was performed for each test case, and three test cases for each type were comparatively evaluated. It is deemed that the findings from this study may be used to finally derive qualitative assesment scale for the view seen from apartment units.

• Proceedings of the KIEE Conference
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• 2007.04a
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• pp.322-324
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• 2007

In this paper, an eye-in-hand visual servoing strategy for keeping feature points within the FOV(field-of-view) is proposed. We first specify the FOV constraint which must be satisfied to keep the feature points within the FOV. It is expressed as the inequality relationship between (i) the LOS(jine-of-sight) angles of the center of the feature points from the optical axis of the camera and (ii) the distance between the object and the camera. We then design a nonlinear feedback controller which decouples linearly the translational and rotational control loops. Finally, we show that appropriate choice of the controller gains assures to satisfy the FOV constraint. The main advantage of our approach over the previous ones is that the trajectory of the camera is smooth and circular-like. Furthermore, ours can be applied to the large camera displacement problem.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2006.11a
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• pp.253-259
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• 2006

Since townscape planning zones were introduced in 2000 by a revised Urban Planning Law, interest and understanding on townscape have been enhanced in Korea. Driven by this trend of the time, interest in townscape planning has been growing in the area of urban planning, and local governments have been expressing their interest in townscape management. This study is intended to provide criteria for setting goals of constructing desirable urban environments in harmony with existing condition in Chung-ju City. To this end, questionnaire surveys and awareness research were administered and following findings were obtained in relation to user-specific preferences on view targets and view points for townscape planning in Chung-ju City. In general, citizens of Chung-ju City were found to prefer townscape frequently in use practically, while residents in other areas preferred such townscape as linked with the city' s overall reputation. Both groups were found to prefer natural landscape (Gaemyeongsan, Namsan, etc.) to artificial one as a view target, and Chung-ju Terminal and the neighborhoods and downtown(Seongseo-dong) were presumably preferred as a view point.

• Restorative Dentistry and Endodontics
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• v.17 no.1
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• pp.141-152
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• 1992

Four endodontic instruments from different manufacturers(K - file, Hedstrom - file, K - flex - file, Cavi - Endo) were used to shape 80 mesial canals of extracted posterior teeth. The instrument's ability to enlarge and shape the canals as the original canal shape was assessed by superimposing radiographs of canals obtained before and after canal shaping. The results were as follows 1. Hedstrom - file enlarged canals greater than K - file, K - flex - file, and Cavi - Endo(P<0.05). There are no differences in canal enlargement among K - flex, K - flex - file, and Cavi - Endo(P<0.05). 2. All the instruments showed no difference in canal enlargement between convex side and concave side of B point in proximal and clinical radiographic views, but at the concave side of C point canals were enlarged greater than at the convex side(proximal view of K - file: P<0.05, the others: P<0.01). 3. There was no difference m canal enlargement between convex side and concave side in proximal view of A and D points of K - file and K - flex - file(P<0.05). But in clinical view, canal enlargement at convex side of A point and concave side of D point was greater than that at concave side of A point and convex side of D point respectively. 4. Hedstrom - files showed greater canal enlargement at convex side of A points and concave side of D points (P<0.05 or P<0.01). Cavi - Endo showed no difference in canal enlargement between convex side and concave side at A and D points in proximal view(P<0.05). Bur canal enlargement was greater at concave side than at convex side of D point in clinical view. 5. K - file and Cavi - Endo showed no differences in canal enlargement between convex and concave side in proximal and clinical view (P<0.05). K - flex - file showed greater canal enlargement at concave side in proximal and clinical view(P<0.0:5). Hedstrom file showed no difference in canal enlargement between convex side and concave side in proximal view, but showed greater canal enlargement at concave side in clinical view(P<0.05).

• Hwankyungkyoyuk
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• v.12 no.1
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• pp.322-334
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• 1999

In environmental value education, the difference between Ecological and Economic view-point about environmentmust should be considered. Usually, although the differences are unavoidable, because our lifes are inclined to Economic life. But this propensity have become great obstacles to Environmental value education by diluting the fundamental reasons which the nature should be preserved. Furthermore we can't say that environmental problems are not solved just by economic approach, owing to its limits of solving by incentives. So we can say that it is very important to have equalized view-points in the relations of economics and ecology for balanced environmental value education. This study is to alternative environmental value education program, to have equalized view-points in the relations of economics and ecology through the small community located in Japan. The exact name of that program is GENSANGGAI. They have persued to attain a spiritual state of complete absence of ego through this program, and this spiritual state can be important environmental value educaton goal, which make the student to see the evironment with equalized view-points in the interdependence between economics and ecology. we can say that this program can be a kind affective (sentimentally perceived) environmental education program. It can be good environmental education program in affective domain. we can say that equalized view-points is to attain a spiritual state of complete absence of ego. This program is some similar to Kohlberg's latter term theory and Open educationin theory in substantial aspect, he persued Just Community Approach through Kibbutz in Israel. From the basis of his theory, if the GENSANGGAI program, which means harmony between socialization and development of moral stage, individualism and communism.

• KIEAE Journal
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• v.6 no.4
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• pp.3-10
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• 2006

To preserve scenic-view of Gwanak Mountain from the urban development, the viewshed component ratio and the scenic-view preference are investigated and analyzed by selecting view points at Nangokro. After 16 candidate view points are selected from the site, sight component ratio is measured through visual structure analysis and preference are measured by using the Likert scale. In addition, factor analysis, and regression analysis were conducted to examine the relationship between influencing factors and preference. As a result of the regression analysis of the 9 factors to influence the scenic-view preference, two factors such as degree of natural landscape and degree of arrangement around the site are chosen to influence the scenic-view preference. Through the preference factor analysis, two preference factors are selected as follows; 1) The factor of the landscape formation - Existence and nonexistence of the scenic-view conservation, degree of the landscape opening, and degree of natural landscape, degree of the landscape originality, and degree of the landscape sequence, degree of the landscape intimacy 2) The factor surrounding the landscape - Degree of arrangement around the site, degree of the landscape complexity, and atmosphere around the site.

• Proceedings of the IEEK Conference
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• 1999.06a
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• pp.639-642
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• 1999

There exist geometrically invariant relations in single-view images under a specific geometrical structure. This invariance may be utilized for 3D object recognition. Two types of invariants are compared in terms of the robustness to the variation of the feature points. Deviation of the invariant relations are measured by adding random noise to the feature point location. Zhu’s invariant requires six points on adjacent planes having two sets of four coplanar points, whereas the Kaist method requires four coplanar points and two non-coplanar points. Experimental results show that the latter method has the advantage in choosing feature points while suffering from weak robustness to the noise.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.11
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• pp.5506-5521
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• 2017

Three-dimensional video (3DV), as the new generation of video format standard, can provide the viewers with a vivid screen sense and a realistic stereo impression. Meanwhile the view synthesis has become an important issue for 3DV application. Differently from the conventional methods based on depth, in this paper we propose a new view synthesis algorithm, which can employ the correlation among views and warp in the image domain only. There are mainly two contributions. One is the incorporation of sobel edge points into feature extraction and matching, which can obtain a better stable homography and then a visual comfortable synthesis view compared to SIFT points only. The other is a novel image blending method proposed to obtain a better synthesis image. Experimental results demonstrate that the proposed method can improve the synthesis quality both in subjectivity and objectivity.

• Journal of East-West Nursing Research
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• v.19 no.2
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• pp.114-120
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• 2013

Purpose: The purpose of this study was to investigate the view on old age of nurses working at general hospitals, geriatric hospitals, oriental hospitals and public health centers. Methods: Data were collected using a self-report questionnaire from 461 nurses working at 3 general hospitals, 8 geriatric hospitals, 7 oriental hospitals and 6 public health centers located in Seoul, Gyeonggi-do and Chungcheong-do from June 20 to September 6, 2012. Results: The mean score of the nurses' view about old age was 3.38 out of 5 points. The details show that the 'society character' was the highest at 4.58, followed by the 'capacity character' 3.94, the 'psychology-economical character' 3.02 and the 'physical-cognitive character' 2.71. As for workplace, oriental hospitals had the highest points on the view about old age, while geriatric hospitals had the lowest. Conclusion: The results of this study indicated that the nurses' view about old age were above the moderate level. As for workplace, geriatric hospital nurses had the lowest view about old age. Therefore, it is recommended to develop an educational program that may promote the nurses' view about old age and provide the better elderly care service.