• 한국지역지리학회지
• /
• 제19권2호
• /
• pp.362-374
• /
• 2013

정보통신기술은 사회적 활동과 커뮤니케이션 방식을 변화시켜왔으며, 그 과정에서 온라인 공간과 오프라인 공간은 전자가 후자를 대체하고 침식하는 이분적 공간으로 생각되어왔다. 본 연구의 목적은 국지적인 사회적 활동과 커뮤니케이션이 수행되는 도시 공간이 온라인 커뮤니케이션과 오프라인 커뮤니케이션의 교차를 통해 시공간적으로 어떻게 구성되고, 온라인 공간을 통해 어떻게 '재매개'되는지를 탐구하는 것이다. 이를 위해 2013년 1월에 영남대학교 박물관에서 실시된 '영남지역의 역사와 문화'라는 주제의 '지역 교육' 연수를 사례로 살펴본다. 본 연구는 온라인 공간을 통한 커뮤니케이션의 증대는 오프라인 공간에서 '부재적 현존'이나 '장소상실'의 확장을 야기한다는 이분법적 관점을 비판하면서, 오프라인 공간을 재매개하는 온라인공간은 오프라인 공간의 시공간적 제약을 초월하는 공간이 아니라 반대로 도시 공간과 장소의 공간적, 시간적, 물질적, 사회적, 문화적 환경을 반영하는 공간이라는 것을 주장한다.

• 한국음향학회:학술대회논문집
• /
• 한국음향학회 2002년도 하계학술발표대회 논문집 제21권 1호
• /
• pp.69-72
• /
• 2002

본 논문에서 화자공간모델 evolution에 기반한 continuous density hidden Markov model (CDHMM)의 online 적응에 대한 새로운 기법을 제안한다. 학습화자의 a priori knowledge을 나타내는 화자공간모델은 factor analysis (FA) 또는 probabilistic principal component analysis (PPCA)와 같은 은닉변수모델(latent variable model)에 의해 효과적으로 나타내어진다. 은닉 변수모델은 화자공간모델뿐아니라 CDHMM 파라메터의 ajoint prior분포를 표시함으로, maximum a posteriori(MAP)적응기법에 직접 적용되어진다. 화자공간모델의 hyperparameters와 CDHMM파라메터를 동시에 순차적으로 적응하기 위해 quasi-Bayes (QB)추정 기술에 기반한 online 적응기법을 제안한다. 연속숫자음 인식과 관련된 화자적응 실험을 통해 제안된 기법은 적은 적응데이터에서 좋은 성능을 나타내며, 데이터가 증가함에 따라 성능이 지속적으로 증가함을 보여준다.

• ETRI Journal
• /
• 제34권2호
• /
• pp.288-291
• /
• 2012

In this letter, a new online anomaly detection approach for software systems is proposed. The novelty of the proposed approach is to apply a new semantic kernel function for a support vector machine (SVM) classifier to detect fault-suspicious execution paths at runtime in a reasonable amount of time. The kernel uses a new sequence matching algorithm to measure similarities among program execution paths in a customized feature space whose dimensions represent the largest common subpaths among the execution paths. To increase the precision of the SVM classifier, each common subpath is given weights according to its ability to discern executions as correct or anomalous. Experiment results show that compared with the known kernels, the proposed SVM kernel will improve the time overhead of online anomaly detection by up to 170%, while improving the precision of anomaly alerts by up to 140%.

• International journal of advanced smart convergence
• /
• 제4권2호
• /
• pp.20-28
• /
• 2015

In this paper, we propose an effective tracking algorithm with an appearance model based on features extracted from a video frame with posture variation and camera view point adaptation by employing the non-adaptive random projections that preserve the structure of the image feature space of objects. The existing online tracking algorithms update models with features from recent video frames and the numerous issues remain to be addressed despite on the improvement in tracking. The data-dependent adaptive appearance models often encounter the drift problems because the online algorithms does not get the required amount of data for online learning. So, we propose an effective tracking algorithm with an appearance model based on features extracted from a video frame.

• 벤처창업연구
• /
• 제4권4호
• /
• pp.71-88
• /
• 2009

The Korean online gaming industry has seen rapid growth since the boom of information technology (IT) related industries, especially Internet and PC-bang or local area network (LAN) use, throughout the country. Online games are real-time games in which two or more players meet, compete, and cooperate in the same game space using the same communication network. Even though the growth rates of IT-related industries have recently slowed, the growth of the online gaming industry has increased, and Korean firms are expanding their businesses to countries all over the world. However, the online gaming industry is becoming an oligopoly, in which 4-5 leading companies occupy most online gaming markets. This situation presents a disadvantage to the Korean online gaming industry, since online players usually seek a diversity of online gaming contents and high quality online game services. Therefore, small- and medium-sized game developers must survive in this market by upgrading the quality of their online gaming services in an effort to provide differentiated goods and services in monopolistic competition markets. However, most venture companies in the online game industry, whether new or previously existing, are not able to obtain adequate financing. The objective of this paper is to examine the management environment for medium- and small-sized game developers in the Korean online gaming industry. By introducing the case of Grigon Entertainment, we try to identify the source of difficulty obtaining external financing for Korean venture firms in the online gaming industry.

• Journal of information and communication convergence engineering
• /
• 제11권4호
• /
• pp.274-281
• /
• 2013

In this study, we consider the challenges in motion planning for automated driving systems. Most of the existing online motion-planning algorithms, which take dynamics into account, find it difficult to operate in an environment with narrow passages. Some of the existing algorithms overcome this by offline preprocessing if environment is known. In this work an online algorithm for motion planning with dynamics in an unknown cluttered environment with narrow passages is presented. It utilizes an idea of hybrid planning with sampling- and discretization-based motion planners, which run simultaneously in a full configuration space and a derived reduced space. The proposed algorithm has been implemented and tested with a real autonomous vehicle. It provides significant improvements in computational time performance over basic planning algorithms and allows the generation of smoother paths than those generated by the recently developed hybrid motion planners.

• 한국학교보건학회지
• /
• 제32권3호
• /
• pp.144-151
• /
• 2019

Purpose: The purpose of this study is to examine academic stress, social support and learning management system(LMS) utilization satisfaction of learners attending online graduate schools and understand the factors influencing their academic persistence. Methods: The participants were students of K online graduate school and the data of 143 students, in total, were collected from April to May in 2019. For data analysis, frequency analysis, x² test, t-test, F-test, Pearson's correlation and multiple regression analysis were conducted using SPSS ver. 23. Results: Academic stress, social support, and LMS utilization satisfaction were associated with academic persistence of online graduate students. The multiple regression analysis of the factors influencing academic persistence showed that the model was significant (p<.001) with an explanatory power of 23% and that significant factors influencing it were academic stress (β=-.23, p=.002), LMS utilization satisfaction (β=.31, p<.001) and jobs (β=.23, p=.002). Conclusion: Although the online graduate students' level of academic persistence was high, it is required to develop strategies to alleviate their academic stress and increase LMS utilization rate in order to increase their persistence to academic success. In addition, it is necessary to provide the foundation on which the utilization of major knowledge regarding jobs can be enhanced, reflecting the characteristics of online graduate students. Furthermore, this study is expected to contribute to the extension of professional and advanced education in response to social needs by developing a variety of online high education learning systems beyond time and space.

• Journal of Information Technology Applications and Management
• /
• 제21권3호
• /
• pp.135-156
• /
• 2014

The Online business model for purchasing agent service is getting more popular. However, consumers perceive more risk when buying products from foreign online purchasing agents (FOPA) than from common online sellers (COS). This study focuses on finding out how consumers manage risk when they perceive risk and what different risk-reliever strategies they use when buying from high-risk FOPA and low-risk COS. This study has proved the following two. First, when consumers perceive risk at online purchasing, they tend to select risk-reliever strategies, such as the use of communication media, online assurance mark, seller's record, and secure payment to mitigate risk. With the application of those risk-reliever strategies, they built trust with the seller. Second, risk-perception of FOPA influences usage of communication media and check of online assurance mark more strongly than that of COS. On the contrary, risk-perception of COS influences the check of seller record more strongly than that of FOPA. This study helps to explain why FOPA is proliferating, despite its inherent high risk due to the fact that buyers and sellers are separated in time and space and that buyers and sellers have different social and cultural backgrounds. This study also helps managers of E-commerce to relieve consumer's risk-perception and to build trust.

• 디지털융복합연구
• /
• 제18권1호
• /
• pp.45-52
• /
• 2020

온라인 루머는 피해자에게 극심한 정신적 스트레스와 이미지 손실을 발생시킨다. 온라인 루머 관련 선행 연구들은 온라인 루머가 온라인 공간에서 발생하는 현상임에도 불구하고 온라인 환경 요인을 크게 고려하지 않았다. 따라서 본 연구는 온라인 루머에 대한 온라인 특성의 영향력을 발견하고자 하였다. 본 연구는 인지된 익명성, 사회적 실재감 부족, 인지된 전파성을 온라인 특성으로 고려하였으며, 온라인 특성이 온라인 루머에 대한 태도를 거쳐 온라인 루머 행동으로 이어지는 연구 모델을 수립하고 실증하였다. 본 연구는 설문조사를 기반으로 소셜 네트워크 사용자 201명의 표본을 확보하였으며, PLS 분석 프로그램을 통해 연구 모델을 검증 하였다. 연구 결과, 인지된 익명성과 인지된 전파성은 온라인 루머에 대한 태도를 거쳐 온라인 루머 행동에 영향을 미치는 것으로 나타났다. 반면에 사회적 실재감 부족은 유의하지 않은 것으로 나타났다. 본 연구의 발견은 개인의 온라인 루머 행동이 온라인 특성에 의해서 발생할 수 있다는 사실을 제공한다. 본 연구는 온라인 루머 행동에 대해 인지된 익명성과 인지된 전파성의 역할을 주목할 필요성을 제시한다.