• Title/Summary/Keyword: 공간 영상

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Load Transfer Characteristics of the 7-wire strand using FBG Sensor Embedded Smart Tendon (FBG센서가 내장된 스마트 텐던을 이용한 7연 강연선의 인발 하중전이 특성)

  • Kim, Young-Sang;Suh, Dong-Nam;Kim, Jae-Min;Sung, Hyun-Jong
    • Journal of the Korean Society of Hazard Mitigation
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    • v.9 no.5
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    • pp.79-86
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    • 2009
  • With the substantial increase of the size of structure, the management of excavation becomes more difficult. Therefore, massive collapses which are related to retaining wall recently increase. However, since the study on measuring and monitoring the pre-stressing force of anchor is insufficient, behavior of anchor may not be predicted and monitored appropriately by the existing strain gauge and load cell type monitoring system. FBG Sensor, which is smaller than strain gauge and has better durability and does not have a noise from electromagnetic waves, is adapted to measure the strain and pre-stressing force of 7-wire strand, so called smart tendon. A series of pullout tests were performed to verify the feasibility of smart tendon and find out the load transfer mechanism around the steel wire tendon fixed to rock with grout. Distribution of measured strains and estimated shear stresses are compared with those predicted by theoretical solutions. It was found that developed smart tendon can be used effectively for measuring strain of 7-wire strand anchor and theoretical solutions underestimate the magnitude of shear stress and load transfer depth.

Web-based Self-directed Learning System for Multi-contents Service (멀티 콘텐츠 서비스를 위한 웹 기반 자기주도적 학습 시스템)

  • Kim, Ji-Seon;Park, Jin-Ah
    • Journal of KIISE:Computing Practices and Letters
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    • v.16 no.1
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    • pp.115-119
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    • 2010
  • As the subjects of education has been changed from the instructors to learners, a web-based self-directed learning which can accelerate the initiative of learners and can be free from the restriction of time and space has been received attention. In this paper, the web-based self-directed learning system was designed. For the design, to make the learners build their own lecture plan, the service was designed to provide three kinds of lectures of video clip, slide lecture, and e-text lecture that were focused on various lecture contents. In addition, a learner and an assistant was man to man matched to enable the on-line mentoring for mutual communication between learners and assistants. Implementation was carried out by three sets of module - Manager, Learner and Assistant - that were applied to the real educational activities. The survey on satisfaction for the education, efficiency of ability improvement, and educational intelligibility for the attendants on the education showed more than 67.2% of satisfaction in satisfaction for the education. Furthermore, more than 86.9% of attendants replied that their ability were improved after the education of this system. The educational system realized in this paper shows effectiveness for the self-directed learning.

Development of Suspended Sediment Algorithm for Landsat TM/ETM+ in Coastal Sea Waters - A Case Study in Saemangeum Area - (Landsat TM/ETM+ 연안 부유퇴적물 알고리즘 개발 - 새만금 주변 해역을 중심으로 -)

  • Min Jee-Eun;Ahn Yu-Hwan;Lee Kyu-Sung;Ryu Joo-Hyung
    • Korean Journal of Remote Sensing
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    • v.22 no.2
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    • pp.87-99
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    • 2006
  • The Median Resolution Sensors (MRSs) for land observation such as Landsat-ETM+ and SPOT-HRV are more effective than Ocean Color Sensors (OCSs) for studying of detailed ecological and biogeochemical components of the coastal waters. In this study, we developed suspended sediment algorithm for Landsat TM/ETM+ by considering the spectral response curve of each band. To estimate suspended sediment concentration (SS) from satellite image data, there are two difference types of algorithms, that are derived for enhancing the accuracy of SS from Landsat imagery. Both empirical and remote sensing reflectance model (hereafter referred to as $R_{rs}$ model) are used here. This study tried to compare two algorithm, and verified using in situ SS data. It was found that the empirical SS algorithm using band 2 produced the best result. $R_{rs}$ model-based SS algorithm estimated higher values than empirical SS algorithm. In this study we used $R_{rs}$ model developed by Ahn (2000) focused on the Mediterranean coastal area. That's owing to the difference of oceanic characteristics between Mediterranean and Korean coastal area. In the future we will improve that $R_{rs}$ model for the Korean coastal area, then the result will be advanced.

Application of SAR DATA to the Study on the Characteristics of Sedimentary Environments in a Tidal Flat (SAR 자료를 이용한 갯벌 퇴적환경 특성 연구)

  • Kim, Kye-Lim;Ryu, Joo-Hyung;Kim, Sang-Wan;Choi, Jong-Kuk
    • Korean Journal of Remote Sensing
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    • v.26 no.5
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    • pp.497-510
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    • 2010
  • In this study, comparisons of the backscattering coefficients and the coherence values which had been extracted from SAR (Synthetic Aperture Radar) images such as JERS-1, ENVISAT and ALOS satellites with surface roughness, surface geometric and soil moisture content were carried out. As the results of analysis using the backscattering coefficient and coherence values from SAR images, the coherence was shown high in the region containing more of mud fraction due to higher viscosity of fine grain-size. A lot of tidal channels were well developed in the Ganghwa tidal flat, affecting the drainage of seawater and subsequent soil moisture content by exposure time of tidal flat. The backscattering coefficient. consequently, appeared to be lower in sand flat and mix flat with decrease of soil moisture. In contrast, most mud flats were distributed at high elevation so that soil moisture was not much influenced by seawater. The backscattering coefficient in mud flat seemed to have a relationship with the density of tidal channel. In addition, lowering backscattering coefficients in the all Ganghwa tidal flat was observed when surface remnant water increased according to the amount of rainfall. The correlation between backscattering coefficient, coherence and sediment environment factors in the Ganghwa tidal flat was investigated. In the future, more quantitative spatial analysis will be helpful to well understand the sedimentary influence of various sediment environment factors.

Effects of Temporal/Social Distance and Message Construal Level on Evaluations of a Retargeting Advertising (복합적인 심리적 거리와 메시지유형의 해석수준 일치가 리타겟팅 광고효과에 미치는 영향)

  • Choi, Hyejin;Kim, Heejin
    • The Journal of the Korea Contents Association
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    • v.19 no.10
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    • pp.593-606
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    • 2019
  • This study examines effective message strategies that fit with the characteristics of retargeting advertisements, based on the Construal Level Theory. First, we investigate whether the social distance that applies between interpersonal interactions can also be observable in an online environment and test the effects of social distance, depending on the type of online sites. We then examine consumers' construal level when social and temporal distances interplay, and how the effects of the messages change accordingly. As a result, social distance and message construal levels by website type were consistent with existing CLT studies. However, the hypothesis that advertising effects will be higher only when all, multidimensions' distances and construal levels of messages match, was partially supported. Also the current view, that the consumers' evaluations will show no difference to when either or both dimensions are distal, was rejected. Instead, when a discrepancy between temporal and social distance was present, the construal level of the message was more effective when congruent with the social distance out the two dimensions. Hence, it is possible to infer that the influence of psychological distance may vary depending on the dimension of distance.

Correlation Between Social Distancing Levels and Nighttime Light (NTL) during COVID-19 Pandemic in Seoul, South Korea Based on The Day-Night Band (DNB) Onboard The Suomi National Polar-Orbiting Partnership (S-NPP) Satellite (코로나19 팬데믹 기간의 서울의 사회적 거리두기 단계 변화와 The Suomi National Polar-Orbiting Partnership (S-NPP) 위성 영상을 이용한 Nighttime Light (NTL) 간의 상관관계)

  • Nur, Arip Syaripudin;Lee, Seulki;Ramayanti, Suci;Han, Ju
    • Korean Journal of Remote Sensing
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    • v.37 no.6_1
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    • pp.1647-1656
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    • 2021
  • In order to reduce the spread of infection due to COVID-19, South Korea has established a four-step social distancing standard and implemented it by changing the steps based on the rate of confirmed cases. The implementation of social distancing brought about a change in the amount of activity of citizens by limiting social contact such as movement and gathering of people. One of the data that can intuitively confirm this is Night Time Light (NTL). NTL is a variable that can measure the size of the national economy measured using lights captured by satellites, and can be used to understand people's social activities during the night. The NTL visible data is obtained via the Visible Infrared Imaging Radiometer Suite (VIIRS) Day-Night Band (DNB) onboard the Suomi National Polar-orbiting Partnership (S-NPP) satellite. 1023 of Suomi data from 1 January 2019 until 26 October 2021 were collected to generate time series of NTL radiance change over Seoul to analyze the correlation with social distancing policy. The results show that implementing the level of social distancing generally decreased the NTL radiance both in spatial disparities and temporal patterns. The higher level of policy, limiting human activities combined with the low number of people who have been vaccinated and the closure of various facilities. Because of social distancing, the differences in human activities affected the nighttime light during the COVID-19 pandemic, especially in Seoul, South Korea. Therefore, this study can be used as a reference for the government in evaluating and improving policies related to efforts reducing the transmission of COVID-19.

Dose Distribution Comparison between Arc Radiation Therapy and Tomotherapy (아크치료기법과 토모테라피치료의 선량분포 비교)

  • Kim, Ji-Yoon;Lee, Seung-Chul;Cheon, Geum-Seong;Kim, Young-Jae
    • Journal of the Korean Society of Radiology
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    • v.15 no.5
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    • pp.723-730
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    • 2021
  • This study tries to compare dose distribution between arc radiation therapy and Tomotherapy, which are main radiation therapy modalities. The subjects of this study are lung cancer patients. For planning target volume (PTV), a dose of 60.0 Gy was set as a basis. The PTVmean of Arc was 61.04 Gy, and that of Tomotherapy was 58.50 Gy. The total lung capacities of Arc and Tomotherapy were 3.0 Gy and 4.24 Gy, respectively. The mean heart doses of Arc and Tomotherapy were 0.13 and 0.34, respectively; the mean trachea dose of Arc and Tomotherapy were 1.35 and 2.58, respectively; the mean esophagus dose of Arc and Tomotherapy were 0.41 and 0.86, respectively; the mean spinal cord dose of Arc and Tomotherapy were 3.65 and 4.68, respectively. With regard to the appropriateness of therapeutic effect in DHV, both modalities seemed appropriate. Tomotherapy protected normal tissues better than Arc radiation therapy. In Tomotherapy, patients need to have treatment long in a limited space. If such a point is overcome, Tomotherapy is better. Otherwise, Arc radiation therapy can be applied. This study was conducted with treatment planning images. Therefore, the results of this study are different from actual treatment results. If more research is conducted to overcome the limitation, the effects of radiation therapy are expected to increase further.

On the Legality of the Telemedicine between the Patient and Doctor Under the Medical Service Act - Focused on the Prescriptions to the Distanced Patients- (의사 환자 간 원격 의료의 의료법상 적법성에 관하여 - 원격 환자에 대한 처방 중심으로 -)

  • Kim, Jang Han
    • The Korean Society of Law and Medicine
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    • v.22 no.1
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    • pp.3-23
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    • 2021
  • Telemedicine is a field of medicine in which medicine doctors who are in remote distance can treat the patients using audio, video devices which can help the diagnosis. In medicine, even the face-to-face diagnosis and treatment is the traditional way, the telemedicine could provide the convenient way for the patients in long distance, disabled or anyone who want to be stay ones' home. But telemedicine has the task to maintain the quality of medical cares compare with the traditional medicine. Among the several types of telemedicine, the specific type telemedicine in which the medicine doctors examine, diagnosis and do the prescription to the remotely distanced patients could be defined tele-prescription. Under The Medical Service act, it is unclear that teleprescription could be allowed. The Medical Service Act has introduced the specific clause for the prescription. That clause includes the duty of patients who have to receive the prescriptions directly from medical doctors. Under this clause, the constitutional court had decided the tele-prescription was illegal, but the supreme court has been decided tele-prescription could be legalized under the certain circumstances. But the other supreme court decided the tele-prescription was illegal under the article 34 of presenting Medical Service Act. So to understand the interpretations of Supreme court and Constitutional court decisions for the cases of prescription via telephone, we need to understand the history and presented reasons for the revision of prescription clause and also need to understand the other related clauses in the same act. In conclusion, To consider the values of telemedicine should be the level with the ordinary treatments, It is reasonable to interpret that the presenting Medical Service Act only legalize the telemedicine between doctor to doctor and which is regulated by the telemedicine clause.

A Study on the Ecological Restoration of Disturbed area in DMZ(Demiltarized zone) (DMZ 내 생태교란지 식물복원 연구)

  • Jung, JI-Young;Kim, Sang-Jun;An, Jong-Bin;Lee, Ahyoung;Hwang, Hee-Suk;Bak, Gippeum;Park, Jinsun;Song, Jin-Heon;Yun, Ho-Geun;Jung, Su-Young;Shin, Hyun-Tak;Lee, Cheol-Ho
    • Proceedings of the Plant Resources Society of Korea Conference
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    • 2019.04a
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    • pp.26-26
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    • 2019
  • DMZ 일원은 정전협정으로 비무장지대(DMZ: Demilitarized Zone)가 설정된 이래 민간인의 출입이 엄격히 금지된 채로 외부의 간섭에서 벗어난 독보적 공간으로 보전되어 오고 있다. 하지만 일부 지역은 자연재해 및 군사적 목적으로 훼손되어 생태적으로 교란된 지역이 발생하여 생태적 건강성이 저하되고 있다. 무엇보다 군사분계선 남쪽 2km에 설치된 남방한계선은 군사적 목적에 따라 시계확보를 위해 불모지작전을 수행하여 생태적 교란 및 토양침식에 의해 생태계가 열악한 실정이다. DMZ 내 생태교란지 식물복원 연구는 DMZ내 생태교란지를 하나의 특수한 생태계로 간주하여, 향후 DMZ내 생태교란지에 특화된 식생복원 체계를 마련하는데 그 목적이 있다. 이에 본 연구에서는 DMZ 155마일(248km)에 대해서 위성영상분석을 수행하여 생태교란지 유형화분류 연구를 수행하여 7개 유형(저지대초지, 서부저지대산지, 저습지 및 수공간 지역 등)으로 분류하였다. 또한 DMZ 생태교란지에 적합한 식물종 선정을 위하여 DMZ 전역을 대상으로 식물상 조사를 실시하여, 분포가 확인된 종을 대상으로 도입 가능종의 검토, 종자 수집 및 채종원 조성을 실시하였다. 추후 DMZ 생태교란지 식물복원에 적합한 공법연구를 수행하고자 한다. 시계확보를 위해 수행되는 불모지 작전에 적합한 종의 선정, 선정된 종을 대상으로 유사환경 조성에 따른 공법 적용, 적용된 공법에 따른 관리 방안 연구를 함께 수행하고자 한다. 본 연구를 통해 DMZ 일원에 특화된 공법개발이 이루어진다면 불모지 작전 및 관리 최소화가 이루어지고, 무엇보다 우리나라 종자 및 야생화 산업의 활성화와 현재 파편화 되어 있는 생태축이 하나의 축으로 연결 될 것이라고 기대해 본다.

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Application of Terrestrial LiDAR for Displacement Detecting on Risk Slope (위험 경사면의 변위 검출을 위한 지상 라이다의 활용)

  • Lee, Keun-Wang;Park, Joon-Kyu
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.1
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    • pp.323-328
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    • 2019
  • In order to construct 3D geospatial information about the terrain, current measurement using a total station, remote sensing, GNSS(Global Navigation Satellite System) have been used. However, ground survey and GNSS survey have time and economic disadvantages because they have to be surveyed directly in the field. In case of using aerial photographs and satellite images, these methods have the disadvantage that it is difficult to obtain the three-dimensional shape of the terrain. The terrestrial LiDAR can acquire 3D information of X, Y, Z coordinate and shape obtained by scanning innumerable laser pulses at densely spaced intervals on the surface of the object to be observed at high density, and the processing can also be automated. In this study, terrestrial LiDAR was used to analyze slope displacement. Study area slopes were selected and data were acquired using LiDAR in 2016 and 2017. Data processing has been used to generate slope cross section and slope data, and the overlay analysis of the generated data identifies slope displacements within 0.1 m and suggests the possibility of using slope LiDAR on land to manage slopes. If periodic data acquisition and analysis is performed in the future, the method using the terrestrial lidar will contribute to effective risk slope management.