• 한국산학기술학회논문지
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• 제17권4호
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• pp.567-572
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• 2016

GPS의 도입과 함께 위성항법시스템과 관련된 많은 연구들이 수행되었으며 이를 통해 위성항법시스템을 이용한 위치 결정의 활용성이 충분히 제시되었다. 하지만 대부분의 연구가 정확도 부분에 초점을 맞추고 있으며 현재 빠르게 발전하고 있는 위성항법시스템과 관련 국가 인프라에 대한 분석적 연구는 부족한 실정이다. 이에 본 연구에서는 현재 다중 위성항법 시스템과 국토지리정보원의 위성기준점의 현황을 파악하고, 실험을 통해 측위성능 향상을 위한 위성측량 인프라 고도화의 방향과 이에 따른 기대효과를 제시하고자 하였다. 연구를 통해 GPS, GLONASS 뿐만 아니라 Galileo, COMPASS, QZSS 등 다중 위성항법시스템이 측량에 적용할 수 있을 정도로 운영되고 있음을 알 수 있었다. 또한 기존 GPS와 GLONASS만을 이용한 VRS 서비스와 다중 위성항법 시스템을 활용하는 경우의 비교를 통해 가용 위성 수, 정밀도, PDOP 등 다중 위성항법시스템 활용에 대한 정량적인 개선점을 제시하고, 위성측량 인프라 고도화를 위해 우선적으로 고려해야할 사항들을 도출하였다. 향후 VRS에서 다중 위성항법 서비스가 가능해 진다면 도심에서 GNSS 측량 요구가 증가하고 있는 현재 대민서비스 만족도를 크게 재고할 것이며, 측량 인프라 선진화에 크게 기여할 것이다.

• 융합정보논문지
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• 제10권1호
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• pp.60-74
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• 2020

가상현실 융합시뮬레이션을 이용한 교육은 간호에 대한 지식뿐만 아니라 임상간호 실무능력 향상을 위한 새로운 교수법으로 주목받고 있다. 본 연구의 목적은 양적, 질적 연구에 대한 통합적 분석방법을 통해 가상현실 융합시뮬레이션을 적용한 간호교육의 효과에 대해 분석하고자 함이다. 총 382편의 연구 중, 논문 질 평가방법을 통해 최종적으로 17편(양적연구 12편, 질적연구 5편)이 선정되었다. 효과적인 가상현실 시뮬레이션 교육을 위한 조건과 지식, 태도, 실천적 측면에서의 가상현실 시뮬레이션 교육의 효과 등 총 네 가지 측면으로 내용을 합성하였다. 효과적인 교육조건 측면에서 가상현실기계 사용에 대한 준비성과 플랫폼에 대한 마스터링, 흥미 있는 시나리오가 필요하였다. 지식, 태도 및 실천적 측면에서의 가상현실 간호교육 융합시뮬레이션의 효과는 간호대학(원)생의 지식 증가 및 유지 연장, 반복학습을 통한 과정 및 순서 암기력 향상, 공감능력 및 친밀감 형성 등의 효과가 나타났다. 따라서 간호교육의 융합시뮬레이션에 가상현실을 적용한다면 교육의 효과는 극대화 될 것이다.

• 한국생활과학회지
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• 제15권6호
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• pp.961-971
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• 2006

The purpose of this study was firstly to provide fundamental data on the activation for the IP-based video phone for the special consumer related to the physically handicapped; secondly to inform empirical data for the consumer public policy in the information technology market, specially for the deaf people. The results of study showed that consumer needs extend to not only simple voice communication for general consumers but also special demands for both the handicapped and the elderly. This study also indicated that VoIP's characteristics of technology would be easily applied to the TRS or VRS which can be adapted to the special consumer market so that VoIP service would be optimal technology for the special consumers like the deaf. In order to successfully implement TRS & VRS business, the paper proposed as follows; 1) the provision of VoIP service enable to satisfying consumers in special market such as the deaf market and the elderly market, 2) the necessity of supporting policy by the related law, and 3) the construction of the system inducing interests from the market participants.

• Journal of Acupuncture Research
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• 제32권3호
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• pp.221-227
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• 2015

Objectives : The purpose of this study is to report the clinical effects of Integrated Medicine Therapy on Tuberculous Spondylitis. Methods : The patient was diagnosed with Tuberculous Spondylitis by MRI. Despite taking antituberculous drugs for one month the back pain remained. As a result the patient was hospitalized shortly thereafter in our hospital, and was treated with acupuncture, pharmacopuncture, and herbal medication during the admission period. The clinical effects of these treatments are measured by the verbal rating scale(VRS), the range of motion(ROM) and the Korean oswestry disability index(KODI). Results : VRS is changed from 10 to 3.5, limited lumbar ROM recovered, KODI changed from 85.71 to 28.57. Conclusions : These results suggest that integrated medicine therapy may be effective for tuberculous spondylitis.

• 경영과정보연구
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• 제26권
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• pp.293-309
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• 2008

This study examined the market efficiency of korea stock market by comparing variance ratios(VR) of stock groups which is sorted by market capitalization. We compute variance ratios of KOSPI large capitalization, midium capitalization, and small capitalization for 546 trading days from 2006/01/02 to 2008/04/15. For our study, we also use high frequency data that is; intra-day 1 minute data. The characteristics of variance ratios of stock groups by market capitalization as follows: From 1 to 5 minute interval, variance ratios of three stock group increase far from zero(0). The longer time interval, the more variance ratios decrease, but only large capitalization converge on around zero. This means that the market of large capitalization is more efficient compare to other stock groups. The entire sample period can be divided two sub-period because the impact of sub prime crisis arised from U.S.A. influences Korea stock market. Before sub prime crisis, the VRs of mid cap and small cap do not converge on around zero except large cap although the time interval is longer. After sub prime crisis, the VRs of three stock groups decrease when time interval is longer, but only large cap converge on around zero. We conclude that large cap is more efficient than other stock groups in Korea Stock Market.

• 대한한방부인과학회지
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• 제29권4호
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• pp.69-79
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• 2016

Objectives: This study aims to report the effect of Korean medicine treatments on a patient with secondary dysmenorrhea caused by Herlyn-Werner-Wunderlich Syndrome (HWWS). Methods: We treated the patient who had secondary dysmenorrhea caused by HWWS, with acupuncture, herbal medicines, pharmacopuncture and hyperthermia therapy at ⃝⃝Hospital of Korean Medicine from July 9th 2016 to September 8th 2016. We evaluated changes of symptoms by Visual analog scale score (VAS), Multidimensional verbal rating scale (MVRS) and Verbal rating scale (VRS). Results: After treatments, the clinical symptoms such as dysmenorrhea (lower abdominal pain & lower back pain), lower abdominal fullness were significantly improved, VAS was decreased, but the improvement of scores on MVRS, VRS were unclear. Conclusions: This case report shows that Korean medical treatment is effective to treat secondary dysmenorrhea caused by HWWS.

• 대한한방부인과학회지
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• 제18권1호
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• pp.156-168
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• 2005

Objective : The purpose of this study is to identify the clinical effects of Chiljehyangbuhwan in the treatment of dysmenorrhea patients. Methods : We studied fifty patients who visited Kyung Hee University Oriental Medical Center from July, 2004 to August, 2004. Women with organic disease such as ut. myoma, ov. cyst and pelvic inflammatory disease were excluded from this study. We treated them with Chiljehyangbuhwan for one menstrual cycle. The severity of dysmenorrhea were measured by MVRS (Multidimensional Verbal Rating scale), VRS (Verbal Rating scale) and VAS (Visual Analog Scale). Results : Chiljehyangbuhwan significantly decreased the severity of dysmenorrhea. Furthermore Chiljehyangbuhwan had an effect on dysmenorrhea for next menstrual cycle without taking. Chiljehyangbuhwan did not show hepatic and renal virulence. Conclusion : This study shows that Chiljehyangbuhwan has remarkable effects on dysmenorrhea patients and that effects continue to next menstrual cycle without taking medicine.

• Journal of Positioning, Navigation, and Timing
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• 제11권4호
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• pp.251-261
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• 2022

The Centimeter Level Augmentation Service (CLAS) is the Precise Point Positioning (PPP) - Real Time Kinematic (RTK) correction service utilizing the Quasi-Zenith Satellite System (QZSS) L6 (1278.65 MHz) signal to broadcast the Global Navigation Satellite System (GNSS) error corrections. Compact State-Space Representation (CSSR) corrections for mitigating GNSS measurement error sources such as satellite orbit, clock, code and phase biases, tropospheric error, ionospheric error are estimated from the ground segment of QZSS CLAS using the code and carrier-phase measurements collected in the Japan's GNSS Earth Observation Network (GEONET). Since the CLAS service begun on November 1, 2018, users with dedicated receivers can perform cm-level precise positioning using CSSR corrections. In this paper, CLAS-based VRS-RTK performance evaluation was performed using Global Positioning System (GPS) observables collected from the refence station, TSK2, located in Japan. As a result of performing GPS-only RTK positioning using the open-source software CLASLIB and RTKLIB, it took about 15 minutes to resolve the carrier-phase ambiguities, and the RTK fix rate was only about 41%. Also, the Root Mean Squares (RMS) values of position errors (fixed only) are about 4cm horizontally and 7 cm vertically.

• 한국환경복원기술학회지
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• 제24권1호
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• pp.97-110
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• 2021

Vegetation index information is an important figure that is used in many fields such as landscape architecture, urban planning, and environment. Vegetation may vary slightly in vegetation vitality depending on photosynthesis and chlorophyll content. In this study, a range of vegetation worth preserving in the Taehwa River water system was determined, and hyperspectral images of drones were acquired (August, October), and the results were presented through DVI(Normalized Defference Vegetation Index), EVI(Enhanced Vegetation Index), PRI(Photochemical Reflectance Index), ARI (Anthocyanin Reflectance Index) index analysis. In addition, field spectral data and VRS-GPS(Virtual Reference System-GPS) surveys were performed to ensure the quality and location accuracy of the spectral band. As a result of the analysis, NDVI and EVI showed low vegetation vitality in October, -0.165 and -0.085, respectively, and PRI and ARI increased to 0.011 and 7.588 in October, respectively. For general vegetation vitality, it was suggested that NDVI and EVI analysis were effectively performed, and PRI and ARI were thought to be effective in analyzing detailed characteristics of plants by spectral band. It is expected that it can be widely used for park design and landscape information modeling by using drone image information construction and vegetation information.

• 대한공간정보학회지
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• 제22권4호
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• pp.127-133
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• 2014

본 연구는 2007년 이래 국토지리정보원에서 제공하고 있는 Network-RTK(VRS) 측량을 항공사진도화에 필요한 지상기준점측량에 적용하기 위하여 그 정확도를 검증하는데 목적이 있다. 세계측지계(ITRF2000)에 근거하여 국가기준점을 고정한 상대측위방식 Static GNSS 측량으로 지상기준점(GCP)을 측정하여 이를 정확값으로 간주하였다. 2종의 Network-RTK 수신기를 이용하여 동일 지상기준점의 위치를 구한 후, 좌표변환과 지오이드 모델을 적용하여 세계측지계 좌표로 변환하였다. Static GNSS 측량과 2종의 Network-RTK 측량에 의한 측정값을 비교한 결과, GCP 위치좌표의 평균제곱근오차는 평면에서 ${\pm}2.0cm$, 표고에서 ${\pm}7.0cm$ 이었다. 즉, 지상기준점측량에서 GPS 수신기 1세트로 짧은 시간 관측할 수 있는 Network-RTK 측량은 GNSS 수신기 2세트 이상을 필요로 하는 RTK 측량이나 GNSS 수신기 2세트 이상으로 장시간의 관측이 필요한 Static GNSS 측량의 실용적인 대안임을 알 수 있었다.