• 한국HCI학회:학술대회논문집
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• 2006.02b
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• pp.633-638
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• 2006

We investigated the importance and efficiency of active and passive exploration on the recognition of objects in a variety of virtual environments (VEs). In this study, 54 participants (19 males and 35 females) were randomly allocated into one of two navigation conditions (active and passive navigation). The 3D visual display was presented through HMD and participants used joysticks to navigate VEs. The VEs consisted of exploring four rooms (library, office, lounge, and conference room), each of which had 15 objects. 'Active navigation' was performed by allowing participants to self-pace and control their own navigation within a predetermined time limitation for each room. 'Passive navigation' was conducted by forced navigation of the four rooms in random order. Total navigation duration and objects for both navigations were identical. After navigating VEs, participants were asked to recognize the objects that had been in the four rooms. Recognition for objects was measured by response time and the percentage of correct, false, hit, and miss responses. Those in the active navigation condition had a significantly higher percentage of hit responses (t (52) = 4.000 p < 0.01), and a significantly lower percentage of miss responses (t (52) = -3.763, p < 0.01) in object recognition than those in the passive condition. These results suggest that active navigation plays an important role in spatial cognition as well as providing a better explanation about the efficiency of learning in a 3D-based program.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.67-69
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• 2012

터치스크린 기반의 스마트폰의 경우 작고 좁은 입력 시스템을 가지고 있다. 또한 키들 간의 물리적인 경계가 없어 인접어가 잘못 입력 되는 터치 오류가 자주 발생한다. 본 논문은 스마트폰에서 키보드의 인접키가 잘못 터치 되어 발생하는 오류를 정정하고, 개인화 된 사용자의 입력 빈도에 기반한 입력어 추천 시스템인 Klice에 대하여 설명하고 있으며 기본 입력에 대비한 성능평가 결과도 소개한다. Klice는 현재 Apple사의 AppStore에서 다운 받을 수 있다.

• Journal of Korea Multimedia Society
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• v.13 no.7
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• pp.1023-1043
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• 2010

As main memory get cheaper, it becomes increasingly affordable to load entire index of DBMS and to access the index. Since speed gap between CPU and main memory is growing bigger, many researches to reduce a cost of main memory access are under the progress. As one of those, cache conscious trees can reduce the cost of main memory access. Since cache conscious trees reduce the number of cache miss by compressing data in node, cache conscious trees can reduce the cost of main memory. Existing cache conscious trees use only fixed one compression technique without consideration of properties of data in node. First, this paper proposes the DC-tree that uses various compression techniques and change data layout in a node according to properties of data in order to reduce cache miss. Second, this paper proposes the level of compression locality that describes properties of data in node by formula. Third, this paper proposes Forced Partial Decomposition (FPD) that reduces the nutter of cache miss. DC-trees outperform 1.7X than B+-tree, 1.5X than simple prefix B+-tree, and 1.3X than pkB-tree, in terms of the number of cache misses. Since proposed DC-trees can be adopted in commercial main memory database system, we believe that DC-trees are practical result.

• Journal of Korea Game Society
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• v.15 no.6
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• pp.89-96
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• 2015

The purpose of this paper is to analyze quantitative learning motivation on G learning. For the purpose the paper has analyzed the learning motivation factors through students' review on G learning which had been done at La Ballona Elementary School in Culver City, USA in 2010. On the basis of contents analysis method, it showed what factors of G learning influenced students and raised their academic motivation. Students used the positive, active words such as good, fun, learn, accomplish, easy, quest in terms of learning process, interest and achievement. They also showed future G learning intention describing terms such as love and miss. Team Quest has been especially developed for G learning class this time. Students had to help each other to solve the team quests which is different from traditional textbook. The system raised students' academic motivation.

• The Journal of the Korea Contents Association
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• v.13 no.10
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• pp.151-159
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• 2013

Formalism narrative theory adopts the dualism of Fabula, story material and Sujet, story substance. The recent theories of storytelling convert the dualism into story and storytelling. This essay delves into the mechanism of contemporary storytelling by comparatively analyzing the storytelling of two films, A Korean film, Family Ties and A Hollywood film, Little Miss Sunshine, which are considered to represent contemporary storytelling. While the latter builds its structure through desire usually shown in the classical Hollywood films, the former has the structure which has nothing to do with causality by displaying fragmented stories. And the latter has typical characters, while the former shows totally different reality, using the obscure characters. In conclusion, Little Miss Sunshine has a storytelling which puts audience feeling in tune by controlling it, and Family Ties has one which delivers director's intention.

• Safety and Health at Work
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• v.2 no.2
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• pp.158-168
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• 2011

Objectives: The present study aims to determine the causal relationship between self-rated depression and experiences of injury and accidents in municipal firefighters. Methods: A panel survey of 186 municipal firefighters measured with depressive symptoms according to the Beck's depression index (BDI) was conducted. The effects of job-related injuries and accidents were evaluated using self-administered questionnaires that were taken once in a 12-month period from 2005 to 2006. Firefighters were classified into the Depression Group or Control Group based on follow-up BDI results with a cutoff level that was set to having "over mild depression." Results: The depression Group was comprised of 17 (9.1%) workers, including 9 firefighters who met had sufficient BDI scores twice in the 2-year test period and newly sufficient BDI scores in the follow-up test. A significantly higher number of subjects in the Depression Group experienced injuries and accidents in the 2-year test period as compared to the Control Group (15.4% vs. 1.5%, p=0.04). Firefighters who experienced injuries and accidents in the 2-year test period had a 7.4 times higher risk of being in the Depression Group than those who had not. As compared to accidents, near-miss accidents revealed stronger risks related to being classified as in the Depression group (adjusted odds ratio [OR] = 4.58, 95% confidence interval [CI] = 1.15-18.18 vs. Adjusted OR = 4.22, 95% CI = 1.08-16.58). Conclusion: The above results suggest that we should establish an effective program to promote mental health for groups at high risk for self-rated depression, including persons who have experienced consecutive injuries and accidents as well as near-miss injuries.

• Journal of Korea Spatial Information System Society
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• v.6 no.1 s.11
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• pp.19-29
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• 2004

Recently, studies have been performed to improve the cache performance of the R-Tree in main memory. A general mothed to improve the cache performance of the R-Tree is to reduce size of an entry so that a node can store more entries and fanout of it can increase. However, this method generally requites additional process to reduce information of entries and do not support incremental updates. In addition, the cache miss always occurs on moving between a parent node and a child node. To solve these problems efficiently, this paper proposes and evaluates the PR-Tree that is an extended R-Tree indexing method using prefetching in main memory. The PR-Tree can produce a wider node to optimize prefetching without additional modifications on the R-Tree. Moreover, the PR-Tree reduces cache miss rates that occur in moving between a parent node and a child node. In our simulation, the search performance, the update performance, and the node split performance of the PR-Tree improve up to 38%. 30%, and 67% respectively, compared with the original R-Tree.

• Journal of the Korean Society of Clothing and Textiles
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• v.34 no.3
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• pp.437-447
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• 2010

This study compares by gender the preference about ideal female height and body parts. Data was collected through a survey of 203 males and 236 females. The results are as follows: Males and females prefer 161~165cm as the ideal female height and 176~180cm as the ideal male height. In regards to the ideal height difference between couples, both males and females prefer males to be taller, with the head of the female at the same height as the neck of the male. Males and females prefer the shorter height than the ideal height of a fashion model and Miss Korea who got the prize from the korean beauty contest. In the case of Miss Korea, there has been a demand for tall women to participate in world beauty contests. However, this study shows that young people prefer a shorter height than the society expects. Males and females think the shoulder width is ideal when it is 2 times wider than the width of a face in regards to the preference of the ideal female body parts. There is a difference between males and females in the ideal breast size. Males prefer C-cup size while females prefer B-cup size. The ideal size of waist preferred is between 60~65cm to both males and females. The ideal shape of legs preferred to both males and females is a slightly muscular shape.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.8
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• pp.3503-3509
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• 2011

Recently the problem of high unemployment rate of college graduate is one of the government's important issues to be solved. Therefore government has been proposed various policies and strategies to solve the problem and also universities are trying to put their best time and efforts to help students to find their decent jobs. In this study, we have compared the differences of new employee selection criteria between corporation's human resource managers and college students which could be one of the reasons of high unemployment rate. Our research shows that there are significant differences between two groups that are considered to be one of reasons of miss matched employment between companies and applicants. Therefore we have suggested how students, companies and universities can solve the problem of different perceptions on the selection criteria and tried to contribute to increase college students' employment.

• The Journal of the Korea Contents Association
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• v.13 no.10
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• pp.27-36
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• 2013

Recently, as researches on VANET have actively progressed, the convenient and reliable services can be provided to the vehicles. In this paper, we propose the collaborative RSU scheduling scheme using multiple RSUs which are connected through a wired backbone. The proposed scheme efficiently disseminates both unsafety data and safety data, and reduces the deadline miss rate and the average response time. When safety data is occurred, it is send to previous RSU in advance and is scheduled by deadline and reception rate. We provide the prevention technology for unsafety data when the workload is occurred in RSU because it is on-demand data processed by user requests. It is shown through performance evaluation that the proposed scheme outperforms the existing scheme in terms of the deadline miss rate and the average response time according to the number of vehicles and the velocities of vehicles.