http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
실내 위치 추정 시스템의 설치비용 최소화와 위치 정확도 개선에 대한 연구
염진영,강동조,박현주,Yeom, Jin-Young,Kang, Dong-Jo,Park, Hyun-Ju 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.5
Commercialized location estimation System with high accuracy is widely used for various services. However, if the systems aren't completely installed in an indoor, location estimation accuracy tend to be very poor. In this paper, indoor location estimation algorithm to improve the accuracy of object location, by correcting the location information obtained from a system that does not fully install, is proposed. In this paper, UWB-based Ubisense system that provides high position accuracy in an indoor environment was utilized. In conclusion, this paper was able to improve the positioning accuracy, by correcting that information about the location of the measured object in position estimation system. 현재 상용화 되어 있는 위치 추정 시스템은 높은 정확도로 다양한 서비스에 폭넓게 사용되고 있다. 그러나 위치추정 시스템은 실내에서 완벽하게 설치하지 않을 경우 위치 추정 정확도가 매우 좋지 않은 경향을 보인다. 본 논문에서는 Location Fingerprint 기법을 활용하여 완벽하게 설치되지 않은 위치 추정 시스템으로부터 얻은 위치 정보를 보정하여 객체의 위치 정확도를 향상시켜 설치비용을 최소화할 수 있는 실내 위치 추정 알고리즘을 제안한다. 본 논문에서는 실내 환경에서 우수한 위치 정밀도를 제공하는 UWB 기반의 Ubisense 시스템을 활용하였다. 결론적으로, 본 논문에서는 위치 추정 시스템에서 측정한 객체의 위치 정보를 보정함으로써 위치 정확도를 향상시킬 수 있었다.
이동객체가 위치한 환경에 따른 실내 위치추정기법 선택 알고리즘
전현식 ( Hyeonsig Jeon ),염진영 ( Jin-young Yeom ),박현주 ( Hyun-ju Park ) 한국인터넷정보학회 2011 인터넷정보학회논문지 Vol.12 No.2
최근 유비쿼터스 컴퓨팅과 관련된 기술에 대한 관심이 증대되면서, 사용자의 다양한 요구를 만족하기 위하여 이동객체 인식과 위치 추적에 관련된 연구가 필요하다. 위치 기반 서비스에서 최근 진행 중인 가장 중요한 논의 중 하나는 실내 환경에서 위치 인식 서비스를 제공하는 것이다. 본 논문은 실내 환경에서 이동객체의 위치를 효과적으로 추정하는데 도움을 주는 알고리즘을 제안한다. 본 논문에서 제안하는 알고리즘에는 기존에 연구된 삼각측량법과 전통적인 전경 분석측량법을 개선한 환경 적응형 전경 분석측량법을 조합하였다. 본 연구에서 제안하는 실내 위치 추정 알고리즘은 가시 환경에 있는 앵커가 충분한 경우에는 삼각측량법을 활용하고, 그 외의 상황에서는 환경 적응형 전경 분석측량법을 활용한다. 결론적으로 제안하는 알고리즘은 이동객체의 위치 추정 정확도를 향상할 수 있었고, 알고리즘의 복잡도를 낮출 수 있었다. Recently, ubiquitous computing and related technologies is more and more growing concern about. Depending on the trend, the moving object recognition and tracking research have been required in order to meet the diverse needs of the user. In the location-based services, one of the most important issues in the indoor environment is to provide location-aware services. In this paper, the effective algorithm to help estimate the position of moving objects in an indoor environment is proposed. We propose an algorithm that combined the existing trilateration measurement and the improved measurement of environmental adaptation scene analysis. The proposed indoor location estimation algorithm use the trilateration measurement when we have enough anchor in the line-of-sight environment. Otherwise that use measurement of environmental adaptation scene analysis. Consequently, the proposed algorithm has been improved the localization accuracy of a moving object as well as was able to reduce complexity of the algorithm.
우원철,송시헌,고현송,염진영,김성호,김윤,Woo, Won Cheol,Song, Shi Hun,Koh, Hyeon Song,Yeom, Jin Young,Kim, Seong Ho,Kim, Youn 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.11
Objectives : The Objective of this study was to analyze the prognostic factors affecting survival in the patients with glioblastomas. Methods : We retrospectively studied 55 consecutive patients with glioblastomas who were admitted to neurosurgery department from January 1988 to March 1998. Fifteen pateients were excluded from the analysis because of follow-up loss and surgical motality. There were 24 male and 16 female patients, with a mean age of 51 years. Surgery consisted of biopsy in 4(10.0%) patients, subtotal resection in 9(22.5%) patients and gross total resection in 27(67.5%) patients. Nine(22.5%) patients received second operation. Twenty-eight(70%) received postoperative radiation therapy. Various levels of radiation dose were used, 6,000 rad over 7 weeks in most cases. The variable factors were examined for their relationship with survival ; age at the time of diagnosis, gender, duration of neurological symptoms, preoperative neurological state(Karnofsky performance score), extent of surgical resection, location of tumor, reoperation, and postoperative radiotherapy and chemotherapy. Result : The mean survival time was 55 weeks, three(7.5%) of the 40 patients survived more than two years. Survival time with biopsy only cases was 24 weeks, for those with subtotal resection 43 weeks, and for those with gross total resection 67 weeks. A mean survival time from the time of reoperation was 42 weeks. Statistically significant survival factors in glioblastoma were extent of surgical resection, postoperative radiotherapy and reoperation. Summary : Results of our series support the views that the extent of surgery, reoperation and postoperative radiation are important prognostic factors. We also recommend radical tumor removal, postoperative radiotherapy and reoperation, if possible.
뇌량 주위 동맥 근위부에 발생한 외상성 뇌동맥류 - 증례보고 1예 -
우원철,송시헌,고현송,염진영,김성호,김윤,Woo, Won Cheol,Song, Shi Hun,Koh, Hyeon Song,Yeom, Jin Young,Kim, Seng Ho,Kim, Youn 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.2
Traumatic aneurysm is a rare complication of head trauma. Unfortunately, it is rarely recognized until their presence is heralded by delayed deterioration or intracranial hematoma, etc,. Early diagnosis and surgical treatment are most important for good outcome. We recently encountered a patient who developed a pericallosal aneurysm after major trauma. With a high index of suspicion about traumatic aneurysm, brain MRI and MRA were performed. Definitive diagnosis was made by transfemoral carotid angiography, revealing a aneurysm of the right proximal pericallosal artery. The aneurysm was explored through right interhemispheric approch. A $15{\times}15mm$ sized traumatic aneurysmal sac, located in proximal portion of right pericallosal artery was noted. It was dissected from the falx of cerebri and its neck was clipped. The postoperative course was uneventful. Traumatic intracranial aneurysm should be suspected in any patient who deteriorates after the trauma. Early recognition and prompt treatment are warranted in this setting. Definitive surgical treatment of all traumatic intracranial aneurysm is recommended.
김미경 ( Mikyeong Kim ),전현식 ( Hyeonsig Jeon ),염진영 ( Jin-young Yeom ),박현주 ( Hyun-ju Park ) 한국인터넷정보학회 2010 인터넷정보학회논문지 Vol.11 No.2
본 논문에서는 Ultra-Wide-Band(UWB) 영역 측정을 활용한 이동객체 위치추정과 이동객체 위치정확도를 개선하기 위한 방법을 논한다. 실외환경과는 달리 실내에서는 여러 가지 노이즈로 인해 이동객체의 위치추적이 어렵다. UWB는 최근 위치추적 응용에서 주목을 받고 있는 라디오 기술이다. UWB의 영역측정 기술은 cm 수준의 정확도를 제공한다. UWB의 데이터 전송과 정밀한 영역측정, 물질관통의 특성은 실내위치추적 응용에 적합하다. 본 논문은 UWB 영역 기술과 파티클 필터를 이용한 이동객체의 위치추정 알고리즘을 제안한다. 기존 위치추정 알고리즘들은 이동객체의 위치추정을 한 후에 예상되는 오차와 bias 값을 제거하였다. 그러나 이 논문에서 제안한 알고리즘은 먼저 예상되는 UWB 영역 거리 오차를 제거하고 난 후에 이동객체의 위치를 추정한다. 본 논문에서는 제안 알고리즘이 기존 이동객체의 위치 추정 후 오차를 제거하는 방식보다 위치정밀도가 좋아졌음을 실험을 통하여 보였다. 본 연구에서는 UWB를 이용하여 고정되어 있고 위치를 알고 있는 세 앵커들과 이동객체 간의 추정 거리로부터 bias값과 반복 영역 오차 값을 제거한 후 삼각측량을 하여 이동객체의 위치를 추정하였다. 마지막으로 파티클 필터를 사용하여 이동객체의 위치 정밀도 개선을 한다. 실험 결과는 제안 위치추정 방식이 실내 환경에서 더 정밀함을 보인다. This paper addresses the problem of moving object localization using Ultra-Wide-Band(UWB) range measurement and the method of location accuracy improvement of the indoor moving object. Unlike outdoor environment, it is difficult to track moving object position due to various noises in indoor. UWB is a radio technology that has attention for localization applications recently. UWB`s ranging technique offer the cm accuracy. Its capabilities for data transmission, range accurate estimation and material penetration are suitable technology for indoor positioning application. This paper propose a positioning algorithm of an moving object using UWB ranging technique and particle filter. Existing positioning algorithms eliminate estimation errors and bias after location estimation of mobile object. But in this paper, the proposed algorithm is that eliminate predictable UWB range distance error first and then estimate the moving object`s position. This paper shows that the proposed positioning algorithm is more accurate than existing location algorithms through experiments. In this study, the position of moving object is estimated after the triangulation and eliminating the bias and the ranging error from estimation range between three fixed known anchors and a mobile object using UWB. Finally, a particle filter is used to improve on accuracy of mobile object positioning. The results of experiment show that the proposed localization scheme is more precise under the indoor.