• JSTS:Journal of Semiconductor Technology and Science
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• v.17 no.3
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• pp.446-457
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• 2017

In order to reduce the size of frame memory or bus bandwidth, frame memory compression (FMC) recompresses reconstructed or reference frames of video codecs. This paper proposes a novel FMC design based on discrete wavelet transform (DWT) - set partitioning in hierarchical trees (SPIHT), which supports fine-scalable throughput and is area-efficient. In the proposed design, multi-cores with small block sizes are used in parallel instead of a single core with a large block size. In addition, an appropriate pipelining schedule is proposed. Compared to the previous design, the proposed design achieves the processing speed which is closer to the target system speed, and therefore it is more efficient in hardware utilization. In addition, a scheme in which two passes of SPIHT are merged into one pass called merged refinement pass (MRP) is proposed. As the number of shifters decreases and the bit-width of remained shifters is reduced, the size of SPIHT hardware significantly decreases. The proposed FMC encoder and decoder designs achieve the throughputs of 4,448 and 4,000 Mpixels/s, respectively, and their gate counts are 76.5K and 107.8K. When the proposed design is applied to high efficiency video codec (HEVC), it achieves 1.96% lower average BDBR and 0.05 dB higher average BDPSNR than the previous FMC design.

• The Korean Journal of Community Living Science
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• v.27 no.4
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• pp.831-850
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• 2016

The ratio of suicide among the elderly in Korea has nearly tripled within the last 20 years. With this in mind, this study examined the effects of social exclusion on depression and suicidal ideation among the elderly living in elderly-only households with a focus on gender differences. Social exclusion is composed of economic, health, housing, education, social participation, and relational aspects. For this study, data were gathered from 527 participants aged 65 years and over. The statistical methods used for data analysis were descriptive statistics, chi-square test, t-test, and hierarchical regression analysis with the SPSS Win 20.0 program. The results of this study are summarized as follows: First, more than 80% of the elderly experienced social exclusion. Women were shown to be more vulnerable than men in terms of housing exclusion, educational exclusion, health exclusion, and multiple exclusion, whereas men were more vulnerable than women in terms of social participation exclusion. Second, social exclusion had significant effects on suicidal ideation among the Korean elderly. We also observed gender differences in the results. Regression analysis of suicidal ideation showed that relational exclusion had a significant effect on suicidal ideation in men, whereas health exclusion had a significant effect on suicidal ideation in women. Results of the study show that stronger social support networks and policies focusing on the elderly are needed in order to reduce elderly suicide in Korea.

• The Journal of the Korea Contents Association
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• v.16 no.8
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• pp.743-755
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• 2016

The objectives of this research is to examine: 1) how the rates of adolescents' BMI change over time in terms of the state level; and 2) development difference in the state level of BMI in terms of children's obesogenic behaviors from 1999 to 2011. Data were drawn from the 1999-2011 Youth Risk Behavior Survey in the United States (N=260, 293, grades 9-12, and 27 states). Ordinary least squares regression and hierarchical linear modeling were utilized to capture a longitudinal time effect of school-aged adolescents' obesity rates across the states, controlling for demographics and nutrition- and physical activity-related behaviors. The state's level of children's BMI percentile was significantly associated with longitudinal time. Longitudinal time effect across the states appears to play an important factor associated with children's decrease of BMI percentile. Therefore the states' implementation of physical activity and nutritional policies seems to be effective for preventing and reducing childhood obesity during last decade. More attention should focus on enforcing the policy and overcoming current barriers in order to minimize children's obesogenic factor.

• Journal of Broadcast Engineering
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• v.20 no.1
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• pp.16-25
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• 2015

Even if the demands for ultra-high-quality multimedia contents are increasing, it is difficult to produce, encode, play and transport ultra-high-quality contents under the existing broadcasting environment. By the reason, various technologies for the UHD contents have been developed in order to satisfy the user's needs. In this paper, we propose a design methodology of a broadcasting system, which consists of two parts, for UHD services with two parts. At the transmit part of the proposed system can encode a video into several layered-bitstreams hierarchically, and then transport each bitstream over heterogeneous networks. The receiver part can play the received video by composing the separated bitstreams. The proposed system can adaptively provide both HD and UHD contents according to user's reception conditions by using the heterogeneous networks.

• Journal of Families and Better Life
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• v.27 no.6
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• pp.125-139
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• 2009

This experiment was conducted in order to examine what consists of romantic beliefs of college students, the overall tendency of the beliefs and motivation of marriage, the differences in the belief and motivation of marriage, and the influence of the beliefs toward it. A survey method was used and 394 students participated in this study. The major results of this study were as follows: First of all, there are four components in students' romantic beliefs, which are almighty love, destined love, hopes for romantic love, and only one & true love. Second of all, the students somewhat showed high level of romantic beliefs. This resulted due to the high level of romantic love but low level of only one & true love. Moreover, their motivations toward marriage which consists of intimacy and economic needs, were seen as the most important values in determining marriage. However, marriage due to social impact and the needs for personal growth were found to be placed in the lowest. Thirdly, male students in particular, showed higher beliefs in almighty love and destined love. The students of religion reported higher beliefs in destined love and only one & true love. Moreover, students who have a partner also showed higher beliefs in almighty love and only one & true love. On the other hand, for motivation of marriage, students showed higher inclination to choose for the desire for large families and children as their motivations, particularly for males. Students in the lower age group also showed higher inclination to choose for intimacy and economic needs as their motivations. Finally, according to the result of the hierarchical regression analysis, the higher the students' beliefs for destined love and the lower it is for hopes for romantic love, predicted higher possibility for the social impact and the needs for personal growth as their motivation of marriage. Moreover, the higher the belief for destined love and hopes for romantic love, the higher it is of their inclination to consider intimacy and economic needs for their motivation of marriage. Lastly, the higher it is for the students' belief toward almighty love, the higher it is for one to marry with a consideration and desire for large families with children.

• Journal of Environmental Science International
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• v.15 no.12
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• pp.1125-1139
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• 2006

The cluster analysis of diurnal precipitation patterns is performed by using daily precipitation of 59 stations in South Korea from 1973 to 1996 in four seasons of each year. Four seasons are shifted forward by 15 days compared to the general ones. Number of clusters are 15 in winter, 16 in spring and autumn, and 26 in summer, respectively. One of the classes is the totally dry day in each season, indicating that precipitation is never observed at any station. This is treated separately in this study. Distribution of the days among the clusters is rather uneven with rather low area-mean precipitation occurring most frequently. These 4 (seasons)$\times$2 (wet and dry days) classes represent more than the half (59 %) of all days of the year. On the other hand, even the smallest seasonal clusters show at least $5\sim9$ members in the 24 years (1973-1996) period of classification. The cluster analysis is directly performed for the major $5\sim8$ non-correlated coefficients of the diurnal precipitation patterns obtained by factor analysis In order to consider the spatial correlation. More specifically, hierarchical clustering based on Euclidean distance and Ward's method of agglomeration is applied. The relative variance explained by the clustering is as high as average (63%) with better capability in spring (66%) and winter (69 %), but lower than average in autumn (60%) and summer (59%). Through applying weighted relative variances, i.e. dividing the squared deviations by the cluster averages, we obtain even better values, i.e 78 % in average, compared to the same index without clustering. This means that the highest variance remains in the clusters with more precipitation. Besides all statistics necessary for the validation of the final classification, 4 cluster centers are mapped for each season to illustrate the range of typical extremities, paired according to their area mean precipitation or negative pattern correlation. Possible alternatives of the performed classification and reasons for their rejection are also discussed with inclusion of a wide spectrum of recommended applications.

• Fire Science and Engineering
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• v.23 no.2
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• pp.85-95
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• 2009

The fire organization of civil servant is a specified public official job which traditionally is characterized by conservative attributes, highly emphasized with a hierarchical culture and the order from higher position. Such a special condition of the fire organization is seemingly regarded as a prerequisite of the occurrence especially prevalent of the systematic discord rather than the other system of a civil servant such as a common administrative job. The conflict among fire officials which is caused by the variety of effort that has been input in pursuit of making a desirable structure does not in progress or even though it dose, weakened by a counterbalance. Therefore, the goal of this research is inducing a plan to revitalize the fire organization through the corroborative analysis of the conflict between indoor duty and outdoor service ones. That is the reason of the disagreement, the device of getting rid of discord and so on.

• The KIPS Transactions:PartB
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• v.16B no.4
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• pp.281-288
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• 2009

This paper proposes a novel algorithm for the efficient classification and annotation of medical images, especially X-ray images. Since X-ray images have a bright foreground against a dark background, we need to extract the different visual descriptors compare with general nature images. In this paper, a Color Structure Descriptor (CSD) based on Harris Corner Detector is only extracted from salient points, and an Edge Histogram Descriptor (EHD) used for a textual feature of image. These two feature vectors are then applied to a multi-class Support Vector Machine (SVM), respectively, to classify images into one of 20 categories. Finally, an image has the Annotation Code Array based on the pre-defined hierarchical relations of categories and priority code order, which is given the several optimal keywords by the Annotation Code Array. Our experiments show that our annotation results have better annotation performance when compared to other method.

• Journal of the Korea Convergence Society
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• v.9 no.4
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• pp.57-63
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• 2018

IoT devices are used in many areas to perform various roles and functions in a cloud environment. However, a method of access control that can stably control the IoT device has not been proposed yet. In this paper, we propose a hierarchical multi-level property access control scheme that can perform stable access of IoT devices used in a cluster environment. In order to facilitate the access of the IoT device, the proposed method not only provides the ID key (security token) unique to the IoT device by providing the IoT Hub, but also allows the IoT Hub to authenticate the X.509 certificate and the private key, So that the private key of the IoT device can not be seen outside the IoT device. As a result of the performance evaluation, the proposed method improved the authentication accuracy by 10.5% on average and the processing time by 14.3%. The overhead of IoT Hub according to the number of IoT attributes was 9.1% lower than the conventional method.

• The Korean Journal of Ecology
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• v.23 no.3
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• pp.193-199
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• 2000

The research about distributional characteristics of coastal mantle communities in South Korea was accomplished. This study was carried out by direct analysis of the latitude and temperatures of each releve site on the basis of syntaxonomy and hierarchical system of coastal mantle communities which was already obtained from Zurich-Montpellier School's method. The distribution of coastal mantle communities in South Korea appeared from North to South in the order of Rosa rugosa community, Vitex rotundifolia community, the Linario-Viticetum rotundifoliae, the Roso-Viticetum rotundifoliae and the Imperato-Viticetum rotundifoliae, and it was recognized that tendencies of continuous and overlapped distribution pattern in adjacent syntaxa. Consequently, It is suggested that the syntaxonomical, geographical and bioclimatic informations of Japan, North Korea and China are essential to determine the distributional patterns of coastal mantle communities in Korean Peninsula.