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Harmonic Suppression Compact Microstrip Patch Antenna for IoT Sensor (고조파 억제를 위한 IoT 센서용 소형 마이크로스트립 패치 안테나)

  • Lee, Hyun-Seung;Lim, Jeong-Taek;Jung, Bang-Chul;Kim, Choul-Young
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.6
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    • pp.85-89
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    • 2017
  • This paper proposes an antenna incorporating a bandstop filter to miniaturize the rectenna used for wireless power transmission with the emerging interest these days. To suppress the harmonics that can be re-radiated, this paper proposes a microstrip patch antenna that can suppress the harmonics while maintaining the size of the antenna by inserting a U-slot, which acts as a bandstop filter, on the ground plane of the antenna. As a result, S11 of the second harmonic(4.6GHz) was reduced from -5.61dB to -0.338dB and the efficiency was suppressed significantly from 29.76% to 1.5%. In addition, the maximum gain was reduced to -12dBi from 2.89dBi. On the other hand, at the fundamental frequency (2.45GHz), the S11 value was reduced from -18 dB to -15 dB, and the efficiency was reduced slightly from 68.2% to 60%. In the case of applying a microstrip antenna combined with the proposed bandstop filter to a rectenna, it is believed that the harmonics that degrade the performance of the rectenna can be removed effectively while reducing the large area occupied by harmonic suppression.

Digital Motion Capture for Types and Shapes of 3D Character Animation (디지털 모션 캡쳐(Motion Capture)를 위한 3D캐릭터 애니메이션의 종류별, 형태별 모델 분류)

  • Yun, Hwang-Rok;Ryu, Seuc-Ho;Lee, Dong-Lyeor
    • The Journal of the Korea Contents Association
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    • v.7 no.8
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    • pp.102-108
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    • 2007
  • Among culture industry that greet digital generation and is observed 21th century the most representative game industry latest is caught what and more interest degree is rising. 2D and 3D animation accomplish continuous growth and development depending action expression along with development of computer technology, and 2D and 3D animation practical use extent are trend that is widening the area in TV, movie, GAME industry etc. through computer hardware and fast change of software technology. The trend of latest game graphic is trend that the weight is changing from 2D to 3D by 3D game and activation of 3D game character that raise player's immersion stuff and Control in 2D's simplicity manufacturing game balance for one side. This treatise that is reality of 3D game character to classify kind of (Motion Capture) and 3D character animation, form model the sense put. Recognize that is overview and reality of 3D game character first for this about example, and is considered to efficiency is high game industry and digital contents industry hereafter by proposing kind model classification of 3D game character animation, form model classification data and character animation manufacture process that application is possible at fast time and effect in 3D character animation application are big.

The Efficacy of Fluorograb for Paediatric Patients Dose Reduction during Pneumatic Reduction and Voiding Cystourethrography (VCUG) (영아/유아의 공기 주입 정복술 및 방사선 배뇨성 방광요도 조영술시 피폭 선량 경감을 위한 FluroGrab의 유용성)

  • Kim, Sang-Tae;Choi, Ji Won;Han, Tae-Jong
    • Proceedings of the Korea Contents Association Conference
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    • 2009.05a
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    • pp.1167-1172
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    • 2009
  • The Pneumatic Reduction and VCUG (Voiding Cystourethrography) are commonly used in the paediatric age group. The procedures had a particularly long fluroscopic screening time, despite a successful outcome for paediatric patients. Pneumatic Reduction and VCUG almost invariably requires fluoroscopic guidance which does confer a radiation dose. This article contains suggestions on how the radiation dose to paediatric patients from Pneumatic Reduction and VCUG can be made "as low as reasonably achievable" (ALARA). The aim of our study was eliminated in spot image applying the FluoroGrab, which has function of capturing an image of interest area from the picturing while fluoroscopic procedures. FluoroGrab has clinical value equivalent to the spot image, and is applied to the most recent fluoroscopic procedures. The radiologist and the radiographers should consider new option for decreasing the radiation exposure delivered to paediatric patients by making equipment modifications to the fluoroscopy to optimize radiation exposure reduction techniques. Thus, we propose the FluoroGrab instead of spot exposure for the reduction of patient exposure dose in paediatric, and try to confirm the effect of the mitigating amount of radiation exposure to paediatric patients when pneumatic reduction and VCUG. Fluorograb is the safe and useful method that shows the equivalent level of accuracy to spot exposure, and to minimize the radiation load to paediatric patients are to be the substitute for the spot exposure for Pneumatic Reduction and VCUG.

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Business Models Proposal for Korean Open Source GIS Software Companies (국내 오픈소스 공간정보 소프트웨어 관련 기업의 비즈니스 모델 제안)

  • Son, Se-Rin;Kang, Youngok
    • Journal of Cadastre & Land InformatiX
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    • v.48 no.1
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    • pp.187-199
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    • 2018
  • The purpose of this study is to propose an open source GIS software business model for the revitalization of Korean open source GIS software industry. In this study, we categorized the types of open source software business models and developed an open source software business strategy suitable for GIS companies in Korea. To propose a business model, we applied the business model canvas which is often used in the area of business studies to analyze new business models. We tried to develop the open source GIS business model through both interviews and case studies with Korean open source GIS software companies. We propose three different types of open source GIS software business models such as distributor model, producer model, and 3rd party service provider model as follows: first, the companies which belong to distributor model can carry out business by providing professional services in the market of open source software. Second, the companies which belong to producer model can sell their products to the global market as well as the domestic market. Lastly, given the growing interest in domestic open source software, the number of third-party service providers is likely to continue to increase in the future. Therefore, it is expected that the companies which belong to the third party service provider model will be able to develop various business models by securing the technology.

A Study on the Profitable Urban Park Model using Smart Street Light System (스마트 가로등 시스템을 적용한 수익형 도시공원모델에 관한 연구)

  • Lee, Ji-Hee;Cho, Han-Bo;Kim, Tae-Han
    • Journal of the Korean Institute of Landscape Architecture
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    • v.40 no.4
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    • pp.28-35
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    • 2012
  • Recently, as the social interest increase has been focused on new renewable energy system to build-up sustainable urban planning system, the related studies have been actively conducting. As well as in other areas, the construction area, which accounts for over 40% of the total energy consumption, clearly showed this tendency. Whereas, various landscape facilities applying renewable energy equipments have been manufactured and installed, systematic study available for planning and designing is rarely found in Korea. This study is expected to contribute to the landscape planning and designing by quantifying the energy-efficient and economic advantages of the renewable energy system for landscape facilities. For this purpose, the analysis on the energy-efficiency and economic values under the scenario that the current fossil power supply for the streetlights in urban parks in Seoul, Daegu, and Incheon were replaced by photovoltaic power generation were performed through RETScreen$^{(R)}$ a clean energy simulation program based on the NASA Satellite Meteorological Data. As a result, the generated power and the economic values vary depending on the climatic features of the appointed cities. This study will be used to build up the effective decision-making in applying the clean renewable system to the plan and design of landscaping.

Clinical Application of the Dual Energy Photon Beam Using 6 MV and 10 MV X-ray (6MV 및 10 MV X-ray의 이중에너지를 생성하는 방사선 발생장치의 임상적 이용)

  • Lee, Myung-Za;Han, Hye-Gyeong
    • Radiation Oncology Journal
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    • v.6 no.1
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    • pp.93-99
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    • 1988
  • Some modern accerelators provide a dual energy for photon beam treatment. The main advantages of dual energy in the treatment of rectosigmoid or rectal cancer are as fellows. 1. Dose in the critical organ such as small intestine, bladder and genital organ are reduced. 2. Presacral and perineal area is fully covered. Dose distribution analysis such as calculation of dose in a target volume, isocenter, $D_{nax}$ and dose spectrum in any region of interest are possible. Examples of plan are given and results are discussed.

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Assessment of Magnetic Resonance Image Quality For Ferromagnetic Artifact Generation: Comparison with 1.5T and 3.0T. (강자성 인공물 발생에 대한 자기공명영상 질 평가: 1.5T와 3.0T 비교)

  • Goo, Eun-Hoe
    • Journal of the Korean Society of Radiology
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    • v.12 no.2
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    • pp.193-199
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    • 2018
  • In this research, 15 patients were diagnosed with 1.5T and 3.0T MRI instruments (Philips, Medical System, Achieva) to minize Ferromagnetic artifact and find the optimized Tesla. Based on the theory that the 3.0T, when compared to 1.5T, show relatively high signal-to-ratio(SNR), Scan time can be shortened or adjust the image resolution. However, when using the 3.0T MRI instruments, various artifact due to the magnetic field difference can degrade the diagnostic information. For the analysis condition, area of interest is set at the background of the T1, T2 sagittal image followed by evaluation of L3, L4, L5 SNR, length of 3 parts with Ferromagnetic artifact, and Histogram. The validity evaluation was performed by using the independent t test. As a result, for the SNR evaluation, mere difference in value was observed for L3 between 1.5T and 3.0T, while big differences were observed for both L4, and L5(p<0.05). Shorter length was observed for the 1.5T when observing 3 parts with Ferromagnetic artifact, thus we can conclude that 3.0T can provide more information on about peripheral tissue diagnostic information(p<0.05). Finally, 1.5T showed higher counts values for the Histogram evaluation(p<0.05). As a result, when we have compared the 1.5T and 3.0T with SNR, length of Ferromagnetic artifact, Histogram, we believe that using a Low Tesla for Spine MRI test can achieve the optimal image information for patients with disk operation like PLIF, etc. in the past.

Development of BIM based LID Facilities Supply Auto-checking Module (BIM 기반 LID 시설 물량 자동 검토 모듈 개발)

  • Choi, Junwoo;Jung, Jongsuk;Lim, Seokhwa;Choi, Joungjoo;Kim, Shin;Hyun, Kyounghak
    • Journal of Environmental Impact Assessment
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    • v.26 no.3
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    • pp.195-206
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    • 2017
  • Recently, Discussion about BIM based LID (Low Impact Development) facilities management system is activated because interest of LID technique for urban water cycle restoration is increasing. For this reason, this paper developed the auto-checking module of the BIM (Building Information Model) based supply output table. This module will be the foundation of the BIM based LID facilities total management system. The research order is composed like next follows: (1) Select target area, (2) Make BIM model of LID facilities and extract supply output table, (3) Develop comparison module, (4) Analysis results. As a result, the authors made 27 LID facilities and developed the supply output table comparison automation module. So, the authors could find differences of 2D design documents based supply output table and BIm based supply output table. So, the authors made an improvement suggestion of the design plan and could construct foundation of the BIM based LID facilities total management system.

Privacy-Preserving Parallel Range Query Processing Algorithm Based on Data Filtering in Cloud Computing (클라우드 컴퓨팅에서 프라이버시 보호를 지원하는 데이터 필터링 기반 병렬 영역 질의 처리 알고리즘)

  • Kim, Hyeong Jin;Chang, Jae-Woo
    • KIPS Transactions on Computer and Communication Systems
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    • v.10 no.9
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    • pp.243-250
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    • 2021
  • Recently, with the development of cloud computing, interest in database outsourcing is increasing. However, when the database is outsourced, there is a problem in that the information of the data owner is exposed to internal and external attackers. Therefore, in this paper, we propose a parallel range query processing algorithm that supports privacy protection. The proposed algorithm uses the Paillier encryption system to support data protection, query protection, and access pattern protection. To reduce the operation cost of a checking protocol (SRO) for overlapping regions in the existing algorithm, the efficiency of the SRO protocol is improved through a garbled circuit. The proposed parallel range query processing algorithm is largely composed of two steps. It consists of a parallel kd-tree search step that searches the kd-tree in parallel and safely extracts the data of the leaf node including the query, and a parallel data search step through multiple threads for retrieving the data included in the query area. On the other hand, the proposed algorithm provides high query processing performance through parallelization of secure protocols and index search. We show that the performance of the proposed parallel range query processing algorithm increases in proportion to the number of threads and the proposed algorithm shows performance improvement by about 5 times compared with the existing algorithm.

Analyzing Tasks in the Statistics Area of Korean and Singaporean Textbooks from the Perspective of Mathematical Modeling: Focusing on 7th Grade (수학적 모델링 관점에 따른 한국과 싱가포르의 통계영역 과제 분석: 중학교 1학년 교과서를 중심으로)

  • Kim, Somin
    • Journal of the Korean School Mathematics Society
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    • v.24 no.3
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    • pp.283-308
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    • 2021
  • This study aims to analyze statistical tasks in Korean and Singaporean textbooks with the mathematical modeling perspective and compare the learning contents and experiences of students from both countries. I analyzed mathematical modeling tasks in the textbooks based on five aspects: (1) the mathematical modeling process, (2) the data type, (3) the expression type, (4) the context, and (5) the mathematical activity. The results of this study show that Korean and Singaporean textbooks provide the highest percentage of the "working-with-mathematics" task, the highest percentage of the "matching task," and the highest percentage of the "picture" task. The real-world context and mathematical activities used in Korean and Singaporean textbooks differed in percentage. This study provides implications for the development of textbook tasks to support future mathematical modeling activities. This includes providing a balanced experience in mathematical modeling processes and presenting tasks in various forms of expression to raise students' cognitive level and expand the opportunity to experience meaningful mathematizing. In addition, it is necessary to present a contextually realistic task for students' interest in mathematical modeling activities or motivation for learning.