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  • Heo, Joon  (141)
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  • 1
    Online Resource
    Online Resource
    Analysis of Seoul Living Sphere using Origin-Destination Data from a Mobile Phone Network
    The Korean Society for Geospatial Information Systems ; 2020
    In:  Journal of Korean Society for Geospatial Information Science Vol. 28, No. 1 ( 2020-03-31), p. 3-10
    Details
    In: Journal of Korean Society for Geospatial Information Science, The Korean Society for Geospatial Information Systems, Vol. 28, No. 1 ( 2020-03-31), p. 3-10
    Type of Medium: Online Resource
    ISSN: 1598-2955 , 2287-6693
    Uniform Title: 휴대전화 빅데이터 기반 기종점 통행량 자료를 활용한 서울시 생활권 분석
    URL: Article
    DOI: 10.7319/kogsis.2020.28.1.003
    Language: English
    Publisher: The Korean Society for Geospatial Information Systems
    Publication Date: 2020
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  • 2
    Online Resource
    Online Resource
    Forest fire risk mapping of Kolli Hills, India, considering subjectivity and inconsistency issues
    Springer Science and Business Media LLC ; 2013
    In:  Natural Hazards Vol. 65, No. 3 ( 2013-2), p. 2129-2146
    Details
    In: Natural Hazards, Springer Science and Business Media LLC, Vol. 65, No. 3 ( 2013-2), p. 2129-2146
    Type of Medium: Online Resource
    ISSN: 0921-030X , 1573-0840
    URL: Article
    DOI: 10.1007/s11069-012-0465-1
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2013
    detail.hit.zdb_id: 2017806-2
    SSG: 14
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    Online Resource
  • 3
    Online Resource
    Online Resource
    P‐144: Sub‐millisecond Switching of Polymer‐stabilized Liquid Crystals with Crossed Patterned Electrodes
    Wiley ; 2017
    In:  SID Symposium Digest of Technical Papers Vol. 48, No. 1 ( 2017-05), p. 1818-1821
    Details
    In: SID Symposium Digest of Technical Papers, Wiley, Vol. 48, No. 1 ( 2017-05), p. 1818-1821
    Abstract: We report switching of polymer‐stabilized liquid crystals (PSLCs) with crossed interdigitated electrodes. A PSLC cell with crossed interdigitated electrodes is switchable between the transparent and opaque states, and it exhibits a sub‐millisecond response time and a low operating voltage. In the transparent state, a PSLC cell driven with crossed interdigitated electrodes has high specular transmittance and low haze; in the opaque state, it has low specular transmittance and high haze. The measured turn‐on and turn‐off time of the fabricated PSLC cells were 0.47 ms and 0.46 ms, respectively. We expect that a PSLC cell driven with crossed interdigitated electrodes can be applied to window display applications.
    Type of Medium: Online Resource
    ISSN: 0097-966X , 2168-0159
    URL: Issue
    URL: Article
    DOI: 10.1002/sdtp.2017.48.issue-1
    DOI: 10.1002/sdtp.12045
    Language: English
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 2526337-7
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Estimation of forest canopy height using orthoimage-refined digital elevation models
    Springer Science and Business Media LLC ; 2015
    In:  Landscape and Ecological Engineering Vol. 11, No. 1 ( 2015-1), p. 73-86
    Details
    In: Landscape and Ecological Engineering, Springer Science and Business Media LLC, Vol. 11, No. 1 ( 2015-1), p. 73-86
    Type of Medium: Online Resource
    ISSN: 1860-1871 , 1860-188X
    URL: Article
    DOI: 10.1007/s11355-013-0238-3
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2015
    detail.hit.zdb_id: 2182123-9
    SSG: 12
    SSG: 21
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    Online Resource
  • 5
    Online Resource
    Online Resource
    A Review of Dynamic Tree Behaviors: Measurement Methods on Tree Sway, Tree Tilt, and Root–Plate Movement
    MDPI AG ; 2021
    In:  Forests Vol. 12, No. 3 ( 2021-03-22), p. 379-
    Details
    In: Forests, MDPI AG, Vol. 12, No. 3 ( 2021-03-22), p. 379-
    Abstract: Urban forest ecosystems are being developed to provide various environmental services (e.g., the preservation of urban trees) to urban inhabitants. However, some trees are deteriorated asymptomatically without exhibiting an early sign of tree displacement, which results in a higher vulnerability under dynamic wind loads, especially during typhoon seasons, in the subtropical and tropical regions. As such, it is important to understand the tilt and sway behaviors of trees to cope up with the probability of tree failure and to improve the efficacy of tree management. Tree behaviors under wind loads have been broadly reviewed in the past literature, yet thorough discussions on the measurement methods for tree displacement and its analysis of broadleaf specimens are lacking. To understand the behavioral pattern of both broadleaf and conifer species, this paper presents a detailed review of sway behavior analysis from the perspectives of the aerial parts of the individual tree, including tree stem, canopy, and trunk, alongside a highlighted focus on the root–plate movement amid the soil-root system. The analytical approaches associated with the time-space domain and the time-frequency domain are being introduced. In addition to the review of dynamic tree behaviors, an integrated tree monitoring framework based on geographic information systems (GIS) to detect and visualize the extent of tree displacement using smart sensing technology (SST) is introduced. The monitoring system aims to establish an early warning indicator system for monitoring the displacement angles of trees over the territory of Hong Kong’s urban landscape. This pilot study highlights the importance of the monitoring system at an operational scale to be applicable in the urban areas showcasing the practical use of the Internet of Things (IoT) with an in-depth understanding of the wind-load effect toward the urban trees in the tropical and subtropical cities.
    Type of Medium: Online Resource
    ISSN: 1999-4907
    URL: Article
    DOI: 10.3390/f12030379
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2527081-3
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    Online Resource
  • 6
    Online Resource
    Online Resource
    A Sensitive Band to Optimize Winter Wheat Crop Residue Cover Estimation by Eliminating Moisture Effect
    MDPI AG ; 2019
    In:  Sustainability Vol. 11, No. 11 ( 2019-05-29), p. 3032-
    Details
    In: Sustainability, MDPI AG, Vol. 11, No. 11 ( 2019-05-29), p. 3032-
    Abstract: Crop residues can retain soil moisture and increase soil organic matter. Crop residue cover is also a hot issue in agricultural remote sensing. Crop residue cover can be estimated linearly with cellulose absorption index (CAI), while moisture of crop residues and soil would reduce the accuracy of crop residue cover estimation. Crop residue and soil were used as materials to carry out the laboratory experiment to reveal the impact of moisture on crop residue cover estimation and eliminate said impact. This paper discovered a sensitive band, R2005, which can invert water content of materials to eliminate moisture effect and improve estimation accuracy of crop residue cover. In terms of inverting water content, compared with two ratio water indices proposed in 2016 (R1.6/R1.5, R1.6/R2.0), using R2005 can increase R2 from 0.828 to 0.935 and decline root-mean-square error (RMSE) from 0.12 to 0.07. At the point of results validation, R2 is 0.958 and RMSE is 0.06, indicating R2005 has a high accuracy. Another advantage of R2005 is that it is more suitable to promote to actual production because of simple and efficient band calculation.
    Type of Medium: Online Resource
    ISSN: 2071-1050
    URL: Article
    DOI: 10.3390/su11113032
    Language: English
    Publisher: MDPI AG
    Publication Date: 2019
    detail.hit.zdb_id: 2518383-7
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  • 7
    Online Resource
    Online Resource
    Exploring Bluetooth Beacon Use Cases in Teaching and Learning: Increasing the Sustainability of Physical Learning Spaces
    MDPI AG ; 2019
    In:  Sustainability Vol. 11, No. 15 ( 2019-07-24), p. 4005-
    Details
    In: Sustainability, MDPI AG, Vol. 11, No. 15 ( 2019-07-24), p. 4005-
    Abstract: Considering the surge in e-learning growth over the last decade and the proliferation of mobile devices in the Bring Your Own Device generation, this paper reviews selected use cases of Bluetooth beacons in educational situations. We review the contribution of Bluetooth beacons to a mixed pedagogy that uses digital and physical learning spaces, and we discuss the pilot deployment of Bluetooth beacons at the Hong Kong Polytechnic University, Hong Kong, to enhance physical learning spaces. Our work represents one of the first deployments of Bluetooth beacons in a university teaching and learning capacity and provides a starting point for others attempting to utilise beacon-enabled location-based services to enhance learner experiences. The widespread adoption of beacon technology in educational institutions has not yet occurred, and the most common usage of beacon transmitters and systems in education is for attendance-taking and dissemination of teaching material. Mobile applications are constantly being developed to utilise the location-based services provided by beacons to enhance student learning and effectiveness. This paper also discusses the sustainability benefits of beacon systems, especially in the contexts of smart campus and smart city development.
    Type of Medium: Online Resource
    ISSN: 2071-1050
    URL: Article
    DOI: 10.3390/su11154005
    Language: English
    Publisher: MDPI AG
    Publication Date: 2019
    detail.hit.zdb_id: 2518383-7
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    Online Resource
  • 8
    Online Resource
    Online Resource
    COVID-19 Infection and Mortality: Association with PM2.5 Concentration and Population Density—An Exploratory Study
    MDPI AG ; 2021
    In:  ISPRS International Journal of Geo-Information Vol. 10, No. 3 ( 2021-03-01), p. 123-
    Details
    In: ISPRS International Journal of Geo-Information, MDPI AG, Vol. 10, No. 3 ( 2021-03-01), p. 123-
    Abstract: The novel coronavirus disease (COVID-19) has become a public health problem at a global scale because of its high infection and mortality rate. It has affected most countries in the world, and the number of confirmed cases and death toll is still growing rapidly. Susceptibility studies have been conducted in specific countries, where COVID-19 infection and mortality rates were highly related to demographics and air pollution, especially PM2.5, but there are few studies on a global scale. This paper is an exploratory study of the relationship between confirmed COVID-19 cases and death toll per million population, population density, and PM2.5 concentration on a worldwide basis. A multivariate linear regression based on Moran eigenvector spatial filtering model and Geographically weighted regression model were undertaken to analyze the relationship between population density, PM2.5 concentration, and COVID-19 infection and mortality rate, and a geostatistical method with bivariate local spatial association analysis was adopted to explore their spatial correlations. The results show that there is a statistically significant positive relationship between COVID-19 confirmed cases and death toll per million population, population density, and PM2.5 concentration, but the relationship displays obvious spatial heterogeneity. While some adjacent countries are likely to have similar characteristics, it suggests that the countries with close contacts/sharing borders and similar spatial pattern of population density and PM2.5 concentration tend to have similar patterns of COVID-19 risk. The analysis provides an interpretation of the statistical and spatial association of COVID-19 with population density and PM2.5 concentration, which has implications for the control and abatement of COVID-19 in terms of both infection and mortality.
    Type of Medium: Online Resource
    ISSN: 2220-9964
    URL: Article
    DOI: 10.3390/ijgi10030123
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2655790-3
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  • 9
    Online Resource
    Online Resource
    Estimating Volume of Martian Valleys using Adaptive TIN Filtering Algorithm
    The Korean Society for Geospatial Information Systems ; 2012
    In:  Journal of Korean Society for Geospatial Information System Vol. 20, No. 3 ( 2012-09-30), p. 3-10
    Details
    In: Journal of Korean Society for Geospatial Information System, The Korean Society for Geospatial Information Systems, Vol. 20, No. 3 ( 2012-09-30), p. 3-10
    Type of Medium: Online Resource
    ISSN: 1598-2955
    Uniform Title: Adaptive TIN 필터링을 이용한 화성 계곡의 체적 추정
    URL: Article
    DOI: 10.7319/kogsis.2012.20.3.003
    Language: English
    Publisher: The Korean Society for Geospatial Information Systems
    Publication Date: 2012
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    Online Resource
  • 10
    Online Resource
    Online Resource
    Seismic Performance Evaluation of Agricultural Reservoir Embankment through Shaking Table Tests
    Korean Society of Hazard Mitigation ; 2021
    In:  Journal of the Korean Society of Hazard Mitigation Vol. 21, No. 3 ( 2021-06-30), p. 151-161
    Details
    In: Journal of the Korean Society of Hazard Mitigation, Korean Society of Hazard Mitigation, Vol. 21, No. 3 ( 2021-06-30), p. 151-161
    Abstract: In this study, shaking table tests were performed to compare and analyze the acceleration response, displacement behavior, and pore-water pressure behavior of reservoirs with parapets installed to prevent overtopping of deteriorative homogeneous reservoirs. During the shaking table tests, the experimental conditions were divided into four cases considering the range and magnitude of seismic acceleration according to national standards. The vibration-type waveform (Gongen) and shock-type waveform (Minogawa) were applied as input waveforms. The acceleration amplification ratios of both vibration- and shock-wave types were the largest in the dam crest, and the amplification ratio decreased as the design earthquake acceleration increased. In addition, the horizontal displacement was maximum on the upstream slope, owing to the influence of seepage water, and the vertical displacement was maximum on the dam crest, owing to the self-weight effect of the parapet structure. A comparison of the waveform results indicates that the vibration-type waveform may exhibit a more significant effect on the embankment zone displacement than the shock-type waveform. However, when the safety standards for the horizontal displacement, settlement ratio, and excess pore-water pressure ratio were applied, the embankment was stable within the allowable range in both the shock-type and vibration-type waveforms. Therefore, the parapet structure is expected to influence the overflow resistance and stability of embankments positively.
    Type of Medium: Online Resource
    ISSN: 1738-2424 , 2287-6723
    URL: Article
    DOI: 10.9798/KOSHAM.2021.21.3.151
    Language: English
    Publisher: Korean Society of Hazard Mitigation
    Publication Date: 2021
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