• Journal of Internet Computing and Services
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• 제11권1호
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• pp.85-102
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• 2010

In this paper, we propose a novel method of analyzing video and representing the relationship among characters based on their contexts in the video sequences, namely Character-Net. As a huge amount of video contents is generated even in a single day, the searching and summarizing technologies of the contents have also been issued. Thereby, a number of researches have been proposed related to extracting semantic information of video or scenes. Generally stories of video, such as TV serial or commercial movies, are made progress with characters. Accordingly, the relationship between the characters and their contexts should be identified to summarize video. To deal with these issues, we propose Character-Net supporting the extraction of major characters in video. We first identify characters appeared in a group of video shots and subsequently extract the speaker and listeners in the shots. Finally, the characters are represented by a form of a network with graphs presenting the relationship among them. We present empirical experiments to demonstrate Character-Net and evaluate performance of extracting major characters.

• Journal of KIISE:Databases
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• 제37권4호
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• pp.203-208
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• 2010

This paper deals with an efficient index scheduling technique based on Hilbert curve and MBR for k-NN query in a single wireless broadcast channel environment. Previous works have two major problems. One is that they need a long time to process queries due to the back-tracking problem. The other is that they have to download too many spatial data since they can not reduce search space rapidly. Our proposed method broadcasts spatial data based on Hilbert curve order where a distributed index table is also broadcast with each spatial data. Each entry of index table represents the MBR which groups spatial data. By predicting the unknown location of spatial data, our proposed index scheme allows mobile clients to remove unnecessary data and to reduce search space rapidly. As a result, our method gives the decreased tuning time and access latency.

• Journal of agriculture & life science
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• 제44권6호
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• pp.51-59
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• 2010

This study was conducted to analyze the type and priority order of forest functions that is suitable in assessing a private forest. A questionnaire survey of experts group and forest officers from the city and county office was conducted and the appropriateness of forest functions type and priority order of function were assessed. Based on the survey conducted, they mostly agreed that it is necessary to change the name of forest functions and integrate the forest functions. Four classifications of forest functions were presented: resources rotation, water yield, living environment, and forest conservation. As the variety of organizations and geographical areas determine which forest functions are the priority, it is necessary to determine which function will become the priority order according to geographical areas, instead of simply dividing the forest functions into national and publicly owned forest when assessing the forest functions of private forests across the nation.

• Journal of the Korea Society of Computer and Information
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• 제15권9호
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• pp.109-117
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• 2010

Recently, study on RFID Tag Searching technique which is used to find a specific tag in particular tag group were developed continuously. RFID tag searching technique can be applicate in various fields such as product management, finding children, and electronic anklet. To implement a RFID tag search system, RFID tag searching protocol should be considered various security threats such as reader and tag tracking, privacy, etc. For implementing a safe RFID tag lookup system, it is important to consider the potential security threats such as the tag tracking problem, and the privacy of the owner of the tag reader problem. There exists an RFID tag lookup system that satisfies a few security requirements, but the privacy of the owner of the tag reader problem has still been left unsolved, and even if it were solved, it requires a considerable amount of cryptographic operations to be performed which results in a decrease in performance. This paper proposes a system that does not degrade the performance while solving the privacy of the owner of the tag reader problem.

• PNF and Movement
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• 제1권1호
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• pp.43-57
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• 2003

목적: 병원치료가 필요하지 않을 만큼의 경부통증/증상과 관절가동범위, 경흉추의 다각적 면에서 관계를 조사하기 위해서이다. 방법: 연령은 19세에서 42세(평균연령 28세로 실험에 참여하기를 원하는 건강한 성인 40명을 대상으로 하였다. 경흉추의 척추 자세, 경추 능동 관절 가동범위, 경부 분절 길이 등의 다각적인 면을 측정하였다. 모든 측정들은 동일시에 각 대상자에게 서로 다른 측정자에 의해 두 번 실시되었다. 경부 근 지구력은 수정된 Biering-Sorensen 검사법에 의해 측정되었다. 마지막으로 대상자들에게 경부 통증/증상의 재발에 대한 질문을 하였다. 결과: 14명의 대상자들은 경미한 재발성 경부 통증/증상을 보고하였다. 경부 근 지구력 시간(F(1,38)=6.75, p=0.01)과 좌측 회전 가동 범위(F(1,38)=4.56, p=0.04)가 경부 통증을 가진 대상자들에서 유의하게 감소하였다. 신전 가동범위가 재 측정에서 특정군 변화 즉, 정상군 증가, 경부 통증/증상군 감소(F(1,38)=4.67, p=0.04)가 보였다. 경부 통증/증상군은 정상군과 비교 시 후인 가동 범위의 증가하였다(F(1,38) =4.56, p=0.04). 통증 유무에 관계없이 모든 대상자들에서 우측 회전보다 좌측 회전에서 가동범위가 더 크게 나타났고(F(1,38) =4.34, p=0.04), 반복 측정에서 좌측 측방굴곡 (F(1,38) =5.10, p=0.03)과 우측 측방 굴곡(F(1,38) = 5.27, p=0.03)의 감소가 나타났다. 결론: 경미한 증상의 경부통증 대상자군과 정상적인 대상자군을 비교할 때 그룹 간 차이는 경부 근 지구력 시간의 감소, 좌측 회전 가동 범위 감소와 특히, 두 번 째 측정에서 신전범위 감소가 나타났으나 후인의 가동범위는 증가로 관찰되었다. 이러한 결과들은 경부 통증의 발생과 관련된 초기 가동범위 변화를 제안한다.

• KIPS Transactions on Software and Data Engineering
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• 제10권9호
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• pp.367-374
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• 2021

Stock price prediction is a subject of research in various fields such as economy, statistics, computer engineering, etc. In recent years, researches on predicting the movement of stock prices by learning artificial intelligence models from various indicators such as basic indicators and technical indicators have become active. This study proposes a deep learning model that predicts the ups and downs of KOSPI from overseas indices such as S&P500, past KOSPI indices, and trading trends by KOSPI investors. The proposed model extracts a latent variable using a stacked auto-encoder to predict stock price fluctuations, and predicts the fluctuation of the closing price compared to the market price of the day by learning an LSTM suitable for learning time series data from the extracted latent variable to decide to buy or sell based on the value. As a result of comparing the returns and prediction accuracy of the proposed model and the comparative models, the proposed model showed better performance than the comparative models.

• Journal of the Korean earth science society
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• 제40권1호
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• pp.9-23
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• 2019

Super-refraction of radar beams tends to occur primarily under a particular vertical structure of temperature and water vapor pressure profiles. A quality control process for the removal of anomalous propagation (AP) ehcoes are required because APs are easily misidentified as precipitation echoes. For this purpose, we collected X-band polarimetric radar parameters (differential reflectivity, cross-correlation coefficient, and differential phase) only including non-precipitation echoes (super-refraction and clear-sky ground echoes) and precipitation echoes, and compared the echo types regarding the relationships among radar reflectivities, polarimetric parameters, and the membership functions. We developed a removal algorithm for the non-precipitation echoes using the texture approach for the polarimetric parameters. The presented algorithm is qualitatively validated using the S-band Jindo radar in Jeollanam-do. Our algorithm shows the successful identification and removal of AP echoes.

• International Area Studies Review
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• 제20권3호
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• pp.81-100
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• 2016

In this study we analyze the performance of overseas subsidiaries of Korean multinationals with localization in sales, purchase, and employment. We use the data of 2,116 overseas subsidiaries in 61 countries between 2008 and 2011 provided by The Export-Inport Bank of Korea. As a result, analysis shows that the effect of localization on the performance is quite different by sectors and countries which the subsidiaries have entered. In the manufacturing sector, increase of local sales has positive effect only in China, while local purchase improves the performance of the subsidiaries in developing counties excluding China. However, the subsidiaries which had made a foray to service sector in advanced countries aquired better performance with localization of sales, purchase, and employment, whereas those in China had no merit except localization of purchase.

• Informatization Policy
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• 제26권3호
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• pp.53-68
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• 2019

The aim of this study was to empirically investigate the difference in life satisfaction between people with disabilities who utilize the Internet and those who do not. The study also found out through an interaction term analysis if there were differences in their life satisfaction and digital utilization by gender, age, education level, employment status, household income, as well as personal characteristics such as disability type and degree. While the existing studies have been mainly focused on the digital divide between the non-disabled and the disabled, this study attempts to further apply the advanced concept of digital divide - digital utilization divide - within the group of people with disabilities. Based on these research findings, this study shows that the digital utilization by people with disabilities has a statistically significant effect on their quality of life, and that life satisfaction of the people with disabilities who use the Internet is affected by their education level, residence, and disability degree. Consequently, these findings indicate implications that suggest an expanded form of digital divide policies for people with disabilities through broadening perspectives on policies for closing such divide.

• The Korean Journal of Applied Statistics
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• 제34권3호
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• pp.347-373
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• 2021

Over the past 50 years, explorative research on the nation's mortality decline patterns has showed a decrease in age-specific mortality rates in all age groups, but there were different improvement patterns in specific mortality rates depending on ages and periods. Greater distinct improvement was observed in mortality rates among women than men, and there was a noticeable improvement in mortality rates in certain groups especially in the more recent decades, revealing a structural change in the overall trends regarding death periods. In this paper, we compare various stochastic mortality models considering cohort effects for mortality projection using Korean female mortality data and further explore the uncertainty related to projection. It also created age-specific mortality rates and life expectancy for women until 2067 based on the results of the analysis, and compared them with future age-specific mortality rates and life expectancy provided by the national statistical office (KOISIS). The best optimal model could vary depending on data usage periods. however, considering the overall fit and predictability, the PLAT model would be regarded to have appropriate predictability in terms of the mortality rates of women in South Korea.