• Journal of Intelligence and Information Systems
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• v.14 no.3
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• pp.59-76
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• 2008

In this paper, we propose an agent architecture called L-CAA that is quite effective in real-time dynamic environments. L-CAA is an extension of CAA, the behavior-based agent architecture which was also developed by our research group. In order to improve adaptability to the changing environment, it is extended by adding reinforcement learning capability. To obtain stable performance, however, behavior selection and execution in the L-CAA architecture do not entirely rely on learning. In L-CAA, learning is utilized merely as a complimentary means for behavior selection and execution. Behavior selection mechanism in this architecture consists of two phases. In the first phase, the behaviors are extracted from the behavior library by checking the user-defined applicable conditions and utility of each behavior. If multiple behaviors are extracted in the first phase, the single behavior is selected to execute in the help of reinforcement learning in the second phase. That is, the behavior with the highest expected reward is selected by comparing Q values of individual behaviors updated through reinforcement learning. L-CAA can monitor the maintainable conditions of the executing behavior and stop immediately the behavior when some of the conditions fail due to dynamic change of the environment. Additionally, L-CAA can suspend and then resume the current behavior whenever it encounters a higher utility behavior. In order to analyze effectiveness of the L-CAA architecture, we implement an L-CAA-enabled agent autonomously playing in an Unreal Tournament game that is a well-known dynamic virtual environment, and then conduct several experiments using it.

• Korean Journal of Community Nutrition
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• v.7 no.5
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• pp.664-674
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• 2002

청소년을 위한 영양 웹사이트의 컨텐츠 개발을 목적으로 사이버 영양정보 이용 현황과 요구도를 파악하고자 서울, 대전, 광주, 대구의 4개 대도시의 남녀 중고등학생 1262명을 임의로 선정하여 2000년 9월부터 10월에 걸쳐 설문지 조사를 실시하고 분석한 결과는 다음과 같다. 조사대상의 인터넷/PC통신의 이용시간은 전체 하루 평균137.0 $\pm$ 100.6분으로 나타났고 남학생이 여학생보다 평균 20.2분 길었다(p<0.05) 영양정보 급원의 이용 비중은 TV/라디오가 가장 컸고(3.69 $\pm$ 1.48) 인터넷/PC통신의 비중은 남녀, 중고생간의 차이 없이 매우 낮았다(1.30 $\pm$1.53). 인터넷/PC통신의 이용은 주로 게임 오락, 채팅이나 사교, 숙제자료를 찾기 위해서였으며 학교 공부 이외의 정보와 지식을 얻기 위한 활용도는 낮았다. 조사대상 중 인터넷/PC통신을 통해 영양정보 습득 경험이 있는 비율은 전차의 34.5%였으며 여학생(38.3%)이남학생(30.3%)보다 높았다(p<0.01). 영양정보 습득을 위해 인터넷/PC퉁신 이용 빈도는 응답자의 72%가 한 달에 1회 이하였으나, 한 달에 4회 이상 이용자도 10.9%나 되었다. 이용 목적은 ‘숙제를 위하여’가 가장 많았고 ‘자신의 건강’ 또는 ‘다이어트를 위함’이 그 다음 순이었다. 이용한 영양 웹사이트들의 전반적인 만족도는 ‘보통’의 수준(3.05 $\pm$ 0.92)이었으며 별로 또는 전혀 만족하지 않는 비율이 29.2%나 되었는데, 개선점으로 ‘정보의 빈약’(36.3%), ‘내용의 지루함과 흥미 부족’ (23.8%), ‘접속 속도의 느림’ (20.7%)의 순이었고, ‘내용의 난해도’는 전체의 13.0%가 지적하였다. 영양 컨텐츠의 내용에 대한 요구도를 조사한 결과 청소년 수준에 맞도록 쉽고 구체적이며 (71,8%), 새로운 정보의 빠른 업데이트(60.6%), 그리고 화면구성면에서는 쉽게 찾아 들어올 수 있고(88.6%) 복잡하지 않은 화면(61.9%)과 캐릭터를 많이 쓰는 것(51.1%)에 대한 요구도가 높았다. 한편 인터넷/PC통신을 통한 영양상담 경험은 남녀나 중고생간의 차이 없이 전반적으로 매우 적었으며(8.1%) 그중 91%가 한 달에 1회 이하로 저조한 상담 빈도를 보였다. 상담목적은 ‘자신의 건강’, ‘숙제’, ‘다이어트’, ‘가족의 건강을 위해’ 순으로 나타났으며, 상담결과에 대한 만족도는 ‘보통’보다 낮은 수준으로서(2.53 $\geq$ 1.01) ‘별로 또는 전혀 만족하지 않는’ 비율이 45.9%로 나타났다. 영양상담사이트의 개선점으로는 답변의 빈약함(43.2%), 난해성(22.7%), 느린 답변(22.7%) 등을 지적하였으며 친절하고 충분한 답변에 대한 요구도가 크게(48.7%) 나타났다. 조사대상들의 영양정보 습득이나 영양상담의 접속 경로는 주로 검색엔진을 통해서였으며 야후와 다음이 가장 많이 이용되었다.

• The Journal of the Korea Contents Association
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• v.13 no.3
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• pp.32-42
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• 2013

As the smartphone market grows, the needs for its new business model are also increased. However, most previous researches on smartphone applications focused on Technology Acceptance Model(TAM) and Rogers' Diffusion of Innovation Theory so that there was lack of researches on characteristics for actual smartphone users. In this research, we divided the smartphone applications into five category functions (Call & Text/Music & Video/Information Search/Game/Social Network Service (SNS)). We analyzed characteristic differences of users who used the each application category and found that the differences were statistically significant in both demographic and smartphone usage characteristics (frequency of downloading applications, and download experience of paid applications). Additionally, the smartphone usage characteristic is closely related to the usage duration. The representative result is that the characteristics of people used Music & Video function actively were women in their 20s who downloaded applications more than three times per week, and had a download experience of paid applications. It is positive result for players in the application markets, because it means the users are willing to pay for downloading the paid applications. However, large companies already occupied most of the market share in music applications so that small and medium-sized players should develop an innovative and distinguishable business model in order to success. We believe this research result would provide significant implications for the players in planning the successful business model and developing an user-specific application product.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.25 no.1
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• pp.19-30
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• 2007

Modeling 3D buildings is an essential process to revive the real world into a computer. There are two ways to create a 3D building model. The first method is to use the building layer of 1:1000 digital maps based on high density point data gained from airborne laser surveying. The second method is to use LiDAR point data with digital images achieved with LiDAR. In this research we tested one sheet area of 1:1000 digital map with both methods to process a 3D building model. We have developed a process, analyzed quantitatively and evaluated the efficiency, accuracy, and reality. The resulted differed depending on the buildings shape. The first method was effective on simple buildings, and the second method was effective on complicated buildings. Also, we evaluated the accuracy of the produced model. Comparing the 3D building based on LiDAR data and digital image with digital maps, the horizontal accuracy was within ${\pm}50cm$. From the above we derived a conclusion that 3D building modeling is more effective when it is based on LiDAR data and digital maps. Using produced 3D building modeling data, we will be utilized as digital contents in various fields like 3D GIS, U-City, telematics, navigation, virtual reality and games etc.

• Journal of the Korean Society of Floral Art and Design
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• no.41
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• pp.93-114
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• 2019

The purpose of this study is to analyze the characteristics and problems of the content of flower design education videos on YouTube and to search for improvement direction. The subjects of analysis were 129 pieces of videos uploaded in the last one year including 'craftman floral design' as a search term. The result shows that contents covered were practical lectures, theory lectures, test related tips, job and character introduction, test work, educational guidance and publicity. The production format could be divided into studio lecture, classroom lecture, video feature, interview, Vlog, and television program. The hub-type programming strategy that periodically uploads the videos satisfying the target audiences' interests is mostly applied. The type of lecture covered 'practical skill test' got a good response from the users. Overall, content diversity, interaction between creators and users, and harmonious programming strategies are lacking. In order to improve this, it is necessary for emotional and expressive creators to pioneer differentiated fields and practice based on actual field. The introduction of interactive elements such as games and quizzes and the application of new media technologies such as VR and AR are worth trying. Three strategic types of 'hero', 'hub', and 'how to' should be applied complementary. As the demand for education content related to flower design is expected to expand in the future, it is required to develop content that can be used in various platforms, foster professional creators, and develop associated business models.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.2D
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• pp.311-318
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• 2009

Interactive terrain visualization is an important research area with applications in GIS, games, virtual reality, scientific visualization and flight simulators, besides having military use. This is a complex and challenging problem considering that some applications require precise visualizations of huge data sets at real-time rates. In general, the size of data sets makes rendering at real-time difficult since the terrain data cannot fit entirely in memory. In this paper, we suggest the effective Real-time LOD(level-of-detail) algorithm for displaying the huge terrain data and processing mass geometry. We used a hierarchy structure with $4{\times}4$ and $2{\times}2$ tiles for real-time rendering of mass volume DEM which acquired from Digital map, LiDAR, DTM and DSM. Moreover, texture mapping is performed to visualize realistically while displaying height data of normalized Giga Byte level with user oriented terrain information and creating hill shade map using height data to hierarchy tile structure of file type. Large volume of terrain data was transformed to LOD data for real time visualization. This paper show the new LOD algorithm for seamless visualization, high quality, minimize the data loss and maximize the frame speed.

• Trans-
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• v.15
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• pp.25-56
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• 2023

VR is a dynamic image simulation technology with very high information density. Among them, spatial depth, temporality, and realism bring an unprecedented sense of immersion to the experience. However, due to its high information density, the information contained in it is very easy to be manipulated, creating an illusion of objectivity. Users need guidance to help them interpret the high density of dynamic image information. Just like setting up navigation interfaces and interactivity in games, interactivity in virtual reality is a way to interpret virtual content. At present, domestic research on VR content is mainly focused on technology exploration and visual aesthetic experience. However, there is still a lack of research on interactive storytelling design, which is an important part of VR content creation. In order to explore a better interactive storytelling model in virtual reality content, this paper analyzes the interactive storytelling features of the VR animated version of <Wolves in the walls> through the methods of literature review and case study. We find that the following rules can be followed when creating VR content: 1. the VR environment should fully utilize the advantages of free movement for users, and users should not be viewed as mere observers. The user's sense of presence should be fully considered when designing interaction modules. Break down the "fourth wall" to encourage audience interaction in the virtual reality environment, and make the hot media of VR "cool". 2.Provide developer-driven narrative in the early stages of the work so that users are not confused about the ambiguous world situation when they first enter a virtual environment with a high degree of freedom. 1.Unlike some games that guide users through text, you can guide them through a more natural interactive approach that adds natural dialog between the user and story characters (NPC). Also, since gaze guidance is an important part of story progression, you should set up spatial scene user gaze guidance elements within it. For example, you can provide eye-following cues, motion cues, language cues, and more. By analyzing the interactive storytelling features and innovations of the VR animation <Wolves in the walls>, I hope to summarize the main elements of interactive storytelling from its content. Based on this, I hope to explore how to better showcase interactive storytelling in virtual reality content and provide thoughts on future VR content creation.

• Journal of dental hygiene science
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• v.3 no.2
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• pp.77-82
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• 2003

The purpose of this study was to examine the characteristics of dental homepages in korea to discuss how they could be improved better. The findings of this study could be described as below : First, dental homepage should include differentiated, specialized content and features. Second, the use of three-dimensional image or multimedia would contribute to increasing people's understanding of dental treatment or general dental information and elevating the effectiveness of dental publicity activities. Third, the want ad and order system used by the business sector or hospital would serve to multiply the management efficiency of dental institutions. Fourth, dental hospitals and clinics that belong to the same network or franchise need to make publicity banner for feasible mutual link, and the use of the same homepage design or common logo would be effective for better image and publicity activities. Fifth, it would be convenient to add the map search function or inquiry system. Seventh, if multiple types of services, such as entertainment or game, are prepared, it would be possible for dental institutions to project a better image and to induce visitors to hit the sites again.

• Journal of the Korea Convergence Society
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• v.9 no.5
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• pp.33-41
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• 2018

The purpose of this study is to develop more accurate and robust emotion prediction neural network (EPNN) model by combining heart rate variability (HRV) and neural network. For the sake of improving the prediction performance more reliably, the proposed EPNN model is based on various types of activation functions like hyperbolic tangent, linear, and Gaussian functions, all of which are embedded in hidden nodes to improve its performance. In order to verify the validity of the proposed EPNN model, a number of HRV metrics were calculated from 20 valid and qualified participants whose emotions were induced by using money game. To add more rigor to the experiment, the participants' valence and arousal were checked and used as output node of the EPNN. The experiment results reveal that the F-Measure for Valence and Arousal is 80% and 95%, respectively, proving that the EPNN yields very robust and well-balanced performance. The EPNN performance was compared with competing models like neural network, logistic regression, support vector machine, and random forest. The EPNN was more accurate and reliable than those of the competing models. The results of this study can be effectively applied to many types of wearable computing devices when ubiquitous digital health environment becomes feasible and permeating into our everyday lives.

• Korean Security Journal
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• no.42
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• pp.277-308
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• 2015

Recently the Japanese hostage crisis with Syria, the stake of the pilots IS of the terror group's affiliates like Kim incident occurred while urinarado IS not an exception anymore in connection with terrorism will not be able to do. In addition, particularly against terrorist groups worldwide, IS being a hero has been marginalized and wants uncritical drugs aimed at teens, such as dialog or game IS through SNS joined nationals as well as other countries, while recommending domestic complaints until the people power or luck, put the older brother can sign up for any terror group IS the terrorist group's terrorist acts while making the environment a national mark by foreigners or immigrants can be caused by the situation. Therefore, in this study, this IS serious for the terrorist acts of the terrorist group, IS due to the expansion of the domestic terrorist group caused the terror raids of about the dangers of foreign countries to review the case, and the incident has sought ways to prevent and respond to the rapporteur. The result IS due to the expansion of the domestic terrorist group caused the terror raids of the dangers of sex exists and that causes a response to the implements are as follows. First of all, IS brokering for the site of the terrorist group's approach to counter-terrorism Act will be a, and the next, each agency and terror for the information exchange and cooperation and serves as a reexamination of terror occurred through the quick and appropriate measures should be the language. Finally, the duties related to terrorism for teens, especially education and strengthen the safety program development and against terrorism should be carried out.