• Journal of the Korean Society of Environmental Restoration Technology
• /
• v.10 no.1
• /
• pp.57-71
• /
• 2007

While a concept on biotop or the urgency of its classification systems have been under discussion recently, this study aims to examine outdoor biotop classification systems for environment-friendly community. To this end, the feasibility of creating a biotop in the community and application elements were generated and biotops were classified and categorized. Then, elements that can be applied in consideration of traditional Korean techniques were generated and biotop classification systems and specific components in residential areas were reviewed. As for the result of this study, based on a preliminary draft prepared through literature review, considerations for biotop classification systems were taken into account. Then, based on classification criteria for biotop formats, biotop functions and biotop types, a second-tier classification system was developed. Criteria for biotop formats included surfaces, lines and points while criteria for biotop functions were large cores, small bases, corridors, stepping stones and ecological islands. Criteria for habitat types were divided to include natural forest, developed green areas, lacustrine wetland, palustrine wetland, shrubs, grasslands, linear habitats, vacant plots and practical green areas, which were sub-categorized. As for the biotop classification system, macro-classification divided biotops into three types-space, line and point-based on biotop formats. Meso-classification had five groups and micro-classification had 21 groups based on habitat types. Future studies should focus on the ecological features of each biotop categories generated in this study and their creation and management techniques to find many practical methods to create, protect and manage outdoor biotop for environment-friendly community.

• Journal of Broadcast Engineering
• /
• v.22 no.6
• /
• pp.774-784
• /
• 2017

Occupancy sensors installed in buildings and households turn off the light if the space is vacant. Currently PIR (pyroelectric infra-red) motion sensors have been utilized. Recently, the researches using camera sensors have been carried out in order to overcome the demerit of PIR that can not detect static people. If the tradeoff of cost and performance is satisfied, the camera sensors are expected to replace the current PIRs. In this paper, we propose vision sensor-based occupancy detection being composed of tracking, recognition and detection. Our softeware is designed to meet the real-time processing. In experiments, 14.5fps is achieved at 15fps USB input. Also, the detection accuracy reached 82.0%.

• Journal of Broadcast Engineering
• /
• v.23 no.5
• /
• pp.642-655
• /
• 2018

Occupancy sensors installed in buildings and households turn off the light if the space is vacant. Currently PIR(pyroelectric infra-red) motion sensors have been utilized. Recently, the researches using camera sensors have been carried out in order to overcome the demerit of PIR that cannot detect stationary people. The detection of moving and stationary people is a main functionality of the occupancy sensors. In this paper, we propose an on-line human occupancy tracking method using convolutional neural network (CNN) and self-organizing map. It is well known that a large number of training samples are needed to train the model offline. To solve this problem, we use an untrained model and update the model by collecting training samples online directly from the test sequences. Using videos capurted from an overhead camera, experiments have validated that the proposed method effectively tracks human.

• Maxillofacial Plastic and Reconstructive Surgery
• /
• v.35 no.1
• /
• pp.13-17
• /
• 2013

Purpose: This study evaluated the capability of bone formation of silk fibroin particles coated with hydroxyapatites (HA/SF), as bone graft material when put into the calvarial defect of rats. Methods: Twenty Sprague Dawley rats were used for this study and round shaped defects were formed in the center of parietal bones (diameter: 8.0 mm). The defect was filled with (1) HA/SF (experimental group), or (2) left as a vacant space (control group). The animals were sacrificed at 4 or 8 weeks, postoperatively. The specimens were decalcified and stained with Masson's trichrome for histomorphometric analysis. Results: The average of new bone formation was $33.18{\pm}3.10%$ in the experimental group and $20.49{\pm}5.79%$ in the control group at 4 weeks postoperatively. That was $42.52{\pm}7.74%$ in the experimental group and $25.50{\pm}7.31%$ in the control group at 8 weeks postoperatively. The difference between the groups was significantly higher at both 4 weeks and 8 weeks postoperatively (P<0.05). Conclusion: The rat calvarial defect was successfully repaired by HA/SF graft. The HA/SF graft showed more new bone formation compared with the unfilled control.

• Journal of the Korean BIBLIA Society for library and Information Science
• /
• v.23 no.4
• /
• pp.327-345
• /
• 2012

This is a study on types and current status of school library in japan that are open to public. it aims to increase library access and further improvement of accessible information environment by opening the libraries within schools. In case of Japan, libraries' importance to school education enacted world's first School library act by 1953 and installation rate of school libraries is achieved up to 100%. These libraries opened to its local community is in the process of increasing library usage and now in total of 11.6% of lower, middle, and upper school are already opened to their local community. Considering decreasing usage of facilities in schools, teacher vacant time, expanding libraries, and other various alternatives should be considered together. It will lead to equal access to information environment and lifelong education. The study suggests ways of installing school libraries in appropriate sizes and forms within their local societies. It also propose possible ways to open school libraries to perform their own functions.

• Journal of the Korean Magnetics Society
• /
• v.20 no.2
• /
• pp.52-60
• /
• 2010

The changes of magnetic flux density distribution and the degree of magnetic anomaly on the ground surface by underground fracture zones and empty spaces had been investigated through the variations of the measuring heights. The magnetic flux density distributions were monitored for the ground surfaces of fracture zones, empty spaces and tunnels by fluxgate-type magnetometer. The fracture zones showed the magnetic anomaly with (+) and (-) peak-pairs in the magnetic flux distribution measured at 0.15 m height from the ground surface, and this anomaly disappeared at the height of 1.15 m. The underground empty spaces and tunnels showed the decrease of magnetic flux densities, where the degree of this density decrease diminished with the increase of the underground depth. And, the existence and size of underground empty spaces, such as tunnels and sink holes, could be monitored by the phenomena of this decreasing flux density.

• Journal of Korean Society of Steel Construction
• /
• v.17 no.4 s.77
• /
• pp.431-438
• /
• 2005

A steel-concrete composite column is a recently developed composite system in which the two opposite flanges of the H-shape section are connected by welded links, and the vacant space enclosed by the flanges, web, and links is filled with concrete. Previous experiments on the SC composite column were performed to evaluate its compression and bending and shear strengths, respectively, and they showed fairly good results. In addition to thesestudies, it may be necessary to evaluate the flexural-axial capacity of an SC composite column, because itscolumn members are generally subjected to axial force and bending moment at the same time. In this study, the bending strength of an SC composite column subjected to axial compression force was investigated experimentally. The results of the study showed that the AISC-LRFD provisions representedexcessively low values compared with those of the ACI, Eurocode-4, and Japan Code provisions. The Eurocode-4 provisions represented reasonable evaluations of the strength of the SC composite column composed of a non-compact section.

• Korean Journal of Remote Sensing
• /
• v.38 no.6_4
• /
• pp.1911-1923
• /
• 2022

The availability of high-resolution satellite images provides precise information without direct observation of the research target. Korea Multi-Purpose Satellite (KOMPSAT), also known as the Arirang satellite, has been developed and utilized for earth observation. The machine learning model was continuously proven as a good classifier in classifying remotely sensed images. This study aimed to compare the performance of the support vector machine (SVM) model in classifying the land cover of the Delaware River port area on high and medium-resolution images. Three optical images, which are KOMPSAT-2, KOMPSAT-3A, and Sentinel-2B, were classified into six land cover classes, including water, road, vegetation, building, vacant, and shadow. The KOMPSAT images are provided by Korea Aerospace Research Institute (KARI), and the Sentinel-2B image was provided by the European Space Agency (ESA). The training samples were manually digitized for each land cover class and considered the reference image. The predicted images were compared to the actual data to obtain the accuracy assessment using a confusion matrix analysis. In addition, the time-consuming training and classifying were recorded to evaluate the model performance. The results showed that the KOMPSAT-3A image has the highest overall accuracy and followed by KOMPSAT-2 and Sentinel-2B results. On the contrary, the model took a long time to classify the higher-resolution image compared to the lower resolution. For that reason, we can conclude that the SVM model performed better in the higher resolution image with the consequence of the longer time-consuming training and classifying data. Thus, this finding might provide consideration for related researchers when selecting satellite imagery for effective and accurate image classification.

• Korean Security Journal
• /
• no.34
• /
• pp.185-207
• /
• 2013

Nowadays, national criminal policy focuses on "specialization", "advancement", and "choice and concentration" to enhance the efficiency and effectiveness of public peace services. Consequently, the space that a nation manages diminishes and there appears vacant space of security. For that reason, in most developed countries including South Korea, there has been a significant expansion in the size and role of Private Security(PS). From this point of view, the Japanese government has adopted the PFI(Private Finance Initiative) system in private prisons. These cases clearly show the role and significance of "PS". By applying know-how of the private sector, these PFI prisons make efficient use of installation by the united efforts of government and people. Criteria such as solution for risk baring, regional coexistence, preservation of public security, response management and operating skills are considered important particularly in Kitsuregawa and Harima prisons. Thus, this study examines the implications and applicability for the expansion of PS in South Korea.

• The Journal of the Korea Contents Association
• /
• v.15 no.5
• /
• pp.200-218
• /
• 2015

The purpose of the present study was to examine daily lives of elderly welfare recipients and their experiences with social welfare services. Researchers collected and analyzed data through individual interviews with 11 elderly welfare recipients. A major theme in the time context was "Daily lives enduring physical and mental sufferings alone and mismatches of social welfare services": 'Starting same tedious days: trading diligent work for basic living assistance', 'Forced ritual of having meals', 'Struggle with depressing night: not attentive welfare services at closing hours', 'Welfare services suspended in holidays', 'Mind and body withered by economic hardship in winter', 'Social support for enduring weary lives'. In the space context, a major themes was "Inadequate welfare services and social interaction in the context of social isolation": 'Unhygienic and unsafe living environment', 'Hiding places: spending tedious days in vacant lots', 'Community welfare centers useful only for healthy elderly', 'Differences and similarities of elderly in urban and rural areas', 'Receiving restricted medical services at hospitals', 'Hard-to-reach public institutions', 'ambivalence about living as welfare recipients'. Based on the findings, the researchers proposed implications for policy and practice to improve elderly welfare recipients' quality of life.