• The Bulletin of The Korean Astronomical Society
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• v.43 no.1
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• pp.70.1-70.1
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• 2018

The DEEP-South photometric census of small Solar System bodies is producing massive time-series data of variable, transient or moving objects as a by-product. To fully investigate unexplored variable phenomena, we present an application of multi-aperture photometry and FastBit indexing techniques to a portion of the DEEP-South year-one data. Our new pipeline is designed to do automated point source detection, robust high-precision photometry and calibration of non-crowded fields overlapped with area previously surveyed. We also adopt an efficient data indexing algorithm for faster access to the DEEP-South database. In this paper, we show some application examples of catalog-based variability searches to find new variable stars and to recover targeted asteroids. We discovered 21 new periodic variables including two eclipsing binary systems and one white dwarf/M dwarf pair candidate. We also successfully recovered astrometry and photometry of two near-earth asteroids, 2006 DZ169 and 1996 SK, along with the updated properties of their rotational signals (e.g., period and amplitude).

• Journal of Astronomy and Space Sciences
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• v.32 no.3
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• pp.189-200
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• 2015

In this study, we present the results of orbit determination (OD) using satellite laser ranging (SLR) data for the Science and Technology Satellite (STSAT)-2C by a short-arc analysis. For SLR data processing, the NASA/GSFC GEODYN II software with one year (2013/04 - 2014/04) of normal point observations is used. As there is only an extremely small quantity of SLR observations of STSAT-2C and they are sparsely distribution, the selection of the arc length and the estimation intervals for the atmospheric drag coefficients and the empirical acceleration parameters was made on an arc-to-arc basis. For orbit quality assessment, the post-fit residuals of each short-arc and orbit overlaps of arcs are investigated. The OD results show that the weighted root mean square post-fit residuals of short-arcs are less than 1 cm, and the average 1-day orbit overlaps are superior to 50/600/900 m for the radial/cross-track/along-track components. These results demonstrate that OD for STSAT-2C was successfully achieved with cm-level range precision. However its orbit quality did not reach the same level due to the availability of few and sparse measurement conditions. From a mission analysis viewpoint, obtaining the results of OD for STSAT-2C is significant for generating enhanced orbit predictions for more frequent tracking.

• Journal of Information Processing Systems
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• v.18 no.3
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• pp.374-388
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• 2022

Database systems usually have many parameters that must be configured by database administrators and users. RocksDB achieves fast data writing performance using a log-structured merged tree. This database has many parameters associated with write and space amplifications. Write amplification degrades the database performance, and space amplification leads to an increased storage space owing to the storage of unwanted data. Previously, it was proven that significant performance improvements can be achieved by tuning the database parameters. However, tuning the multiple parameters of a database is a laborious task owing to the large number of potential configuration combinations. To address this problem, we selected the important parameters that affect the performance of RocksDB using random forest. We then analyzed the effects of the selected parameters on write and space amplifications using analysis of variance. We used a genetic algorithm to obtain optimized values of the major parameters. The experimental results indicate an insignificant reduction (-5.64%) in the execution time when using these optimized values; however, write amplification, space amplification, and data processing rates improved considerably by 20.65%, 54.50%, and 89.68%, respectively, as compared to the performance when using the default settings.

• Journal of Smart Tourism
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• v.4 no.3
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• pp.35-43
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• 2024

Recognizing the critical importance of data and its vital role in advancing the tourism industry, the European Union has begun to invest significantly in the creation of a common European Tourism Data Space (ETDS), an infrastructure to facilitate the sharing of data among tourism stakeholder organizations. In order to inform the design and governance strategies of the ETDS, a series of binary logistic regression models are evaluated to understand the key factors that influence tourism stakeholders' decisions to share various categories of tourism ecosystem data (i.e., Human Capital, Natural Capital, Built Capital, Economic/Social Capital, Environmental Impact, Economic Impact, and Social Impact data) with third parties. Results based on online questionnaire data obtained from European tourism organizations (n=209) indicate that organizational resources, typology, motivations, and effort expectancy all play varying roles in tourism stakeholder data sharing practice. Importantly, this research provides preliminary empirical evidence to support the on-going development of the ETDS. Additionally, this investigation provides the opportunity to revisit the formative theories related to organizational data sharing and to re-evaluate them within the context of today's rapidly evolving tourism sector.

• Journal of the Korean housing association
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• v.16 no.6
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• pp.29-38
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• 2005

Housing consumers prefer high-rise mixed-use apartments because of one-stop living style, and high quality of life. This study investigated the residents community with the residents who lived in the apartments and the future residents who will live in the apartments to investigate the usage of the public spaces and the influence of the space to form housing culture of residents family community. All data were taken from the response of two hundred forty three questionnaire to be gathered during 20th of June through 24th of August in 2003. Data were analyzed with percentages, means, t-test, and variance analysis using SPSS/PC+. Residents in four high-rise mixed-use apartments feels that the public space in the apartments were mainly provided by their convenience of the construction companies not for the residents. Physical conditions of public space in high-rise mixed-use apartments should be environmentally friendly housing space in which nature and human can be coexisted. It also should be high-tech system housing with which SOHO can be operated. And different custom-made spaces which the residents' needs can be satisfying should be provided. The public space should be recommended to be multi-purposed room because the space will be differentiated with the circumstances of the area, the residents' age differences, and the variety of the family's life style. Moreover, the various programs should be supplied to run the public space efficiently.

• Korean Institute of Interior Design Journal
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• v.13 no.3
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• pp.145-152
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• 2004

The European architects including MVRDV, Rem Koolhaas, Van Berkel, and Zaha Hadid tend to use the their own design strategy based on the objective data. This Architectural design method leads to make new paradigm of contemporary architecture. For the purpose of the understanding a part of new architecture paradigm I will analyze the case of Villa VPRO designed by MVRDV. At the result, I can draw the following conclusions. First, through collecting and analyzing data, drawing design concept and planning the space program, they decided on the design strategies of Villa VPRO. They designed the space volume having 42.4m$\times$42.4m floors and infiltrated environmental elements to solve the problems about deep space. Second, Villa VPRO was constructed by 'creative space-making system: a series of floors much like a geological formation, the continuous floors interconnected by spatial means, the precision bombardments of snake-like holes, open elevations, the stacking spaces. Third, Villa VPRO produced the spectacle space effect the various formation of continuous floors make a lot of difference space types in this building. Also they lead to move naturally and give event space. A numbers of holes and openness make it possible to provide friendly environment with combining light and air with views of the surrounding and transparency. And using the method of stacking many types of space make the differences in height.

• Korean Journal of Human Ecology
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• v.23 no.5
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• pp.957-968
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• 2014

The purpose of the study was to find out the meaning of housing and choice factors of housing of the university students. The snowballing method was used to collect the data for analysis. The data were collected from April 4th to 14, 2013, and the sample consisted of 122 university students and 40 pairs of university students and their parents in Seoul. It was examined the meaning of housing and choice factors by university students. The finding of this study was as follows: 1) The meaning of housing was composed of 9types : 'Family harmony space', 'Emotional space', 'Social status space', 'Life space', 'Social relations space', 'Economic space', 'Perform the role space', 'Physical safety space' and 'Privacy space'. 2) The choice factors of housing were composed of 7types : 'Social status', 'Life with Neighborhood', 'Safety and security', 'Transportation and education', 'Ease of use of facilities', 'Economic' and 'Environment'.

• The Bulletin of The Korean Astronomical Society
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• v.36 no.2
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• pp.93.2-93.2
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• 2011

Japan Aerospace Exploration Agency (JAXA) has measured space environment and its effects on spacecraft and astronaut since 1987. At present, we have operated space environment monitors onboard one GEO spacecraft, one QZO spacecraft, and two LEO spacecrafts. The obtained space environment data has been gathered into the Space Environment and Effects System database (SEES, http://sees.tksc.jaxa.jp/). In this presentation, measurement result of space environment in low earth orbit obtained by the Daichi satellite from 2006 through 2011 is reported as well as recent activities in space environment engineerings in JAXA. The Technical Data Acquisition Equipment (TEDA) on board the Daichi satellite (Advanced Land Observing Satellite: ALOS) had been operated in low earth orbit at 700 km altitude with 98 degree inclination from February 2006 until April 2011. The TEDA consists of the Light Particle Telescope and the Heavy Ion Telescope. The operation period of the Daichi satellite was through the solar-activity minimum period. The space radiation environment around the Daichi satellite had been almost stable. However, large solar flares followed by CMEs sometimes disturbed the space radiation environment in the orbit of the Daichi satellite. In addition, high speed solar wind often flowed and modulated the electron flux in the horn region. On the other hand, a little variation was seen in the SAA region.

• Journal of the Korean housing association
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• v.17 no.6
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• pp.65-72
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• 2006

This study was to and out contemporary space design trends of rural houses in So-yang Munhwa village by analyzing their floor plan shapes and space relations & elements of floor plans. There were built 71 houses in that village but it were possible to collect housing data, floor plans & general building records of 41 houses, from house register. By analyzing those data, findings were as follows : 1) Floor plan shapes of rural houses had a tendency to be diverse, various form of 'ㅋ' than simple form of 'ㅡ'. 2) Room-Living-Room, 3 bay arrangement was very strong trends, and traditional planning characteristics that the openness of living space was keeping. 3) Anbang(master bedroom) and living space were important, so two spaces were set forth of floor plan and Anbang with a bathroom were often showed. 4) DK space and its relation to other spaces were important factor to classily 2 floor plan types of them. 5) DK(dining kitchen) space had an openness from back entrance and DK were separated from public spaces L.D.K. Utility or balcony/veranda spaces as a support space of kitchen were planned in rural houses, and they were influenced from apartment houses or urban houses.

• Journal of the Korean housing association
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• v.18 no.6
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• pp.93-101
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• 2007

This study was to find out users' satisfaction on the dormitory of high school in Jeonju City and to propose it's physical environmental improvement directions. This was performed by a questionnaire survey method, and the questionnaire was designed by researchers considering relative literatures. Data were collected from 200 students, who had been dwelling 4 high school dormitories in Jeonju City. By analyzing those data, findings were as follows: 1) Users of students were satisfied the whole of their dormitory; facilities, spaces, and living. 2) They were highly concerned about a library and a personal unit space in their dormitory. 3) They needed their personal unit space to be designed bedroom+bathroom type with 2 persons' sharing and be equipped one story bed and desk furniture. Also, they needed improvement on heating & cooling, small space and indoor air quality of unit space. 4) The users' satisfaction on unit space were 2.88, and their satisfaction of the technical factor was 2.71 that was the lowest score in them. And The functional factor was highly effected their satisfaction. 5) The space utility and the space size of functional factor, the soundproof, the heating/ventilation and the indoor quality of technical factor, and the privacy of behavior factor were highly correlative to their satisfaction of unit space.