A preliminary study on surgical navigation for epiduroscopic laser neural decompression

Jeon, Sangseo,Lee, Gun Woo,Jeon, Young Dae,Park, Il-Hyung,Hong, Jaesung,Kim, Jae-Do Professional Engineering Publishing Ltd. 2015 Proceedings of the Institution of Mechanical Engin Vol. No.

<P>Epiduroscopic laser neural decompression is an emerging therapeutic modality to treat lumbar spine pathologies including chronic low back pain, spinal stenosis, and disk herniation via catheter insertion followed by laser ablation of the lesion. Despite the efficacy of epiduroscopic laser neural decompression, excessive radiation doses due to fluoroscopy during epiduroscopic laser neural decompression have limited its widespread application. To address the issue, we propose a surgical navigation system to assist in epiduroscopic laser neural decompression procedures using radiation-free image guidance. An electromagnetic tracking system was used as the basic modality to track the internal location of the surgical instrument with respect to the patient body. Patient-to-image registration was carried out using the point-based registration method to determine the transformation between the coordinate system of the patient and that of the medical images. We applied the proposed system in epiduroscopic laser neural decompression procedures to assess its effectiveness, and the outcomes confirmed its clinical feasibility. To the best of our knowledge, this is a report on the first surgical navigation applied for epiduroscopic laser neural decompression procedure.</P>

Severe Late-onset Anemia Associated with Rhesus D Alloimmunization

Jaesung Jeon,임진아,오기원 대한주산의학회 2020 Perinatology Vol.31 No.3

Rhesus D (RhD) alloimmunization is the most severe cause of hemolytic disease of the fetus and newborn (HDFN). However, owing to medical advances, pediatricians are likely to encounter only a few relatively mild cases. Therefore, although late-onset anemia is a well-recognized complication of HDFN, it may be overlooked in evaluations for post-discharge surveillance. Herein, we report a case of severe late-onset anemia associated with RhD HDFN. A 37-day-old male infant presented with a marked pale appearance. During the fetal period, he had received intrauterine transfusion six times for the treatment of severe anemia induced by RhD HDFN. However, during the neonatal period, he had no significant clinical manifestations, except mild jaundice. The laboratory findings on the day of presentation showed severe hemolytic anemia with reticulocytosis, which was treated with red blood cell transfusion. Our case report emphasizes that regardless of the initial disease severity during the neonatal period, regular follow-up visits and close monitoring for late-onset anemia in the first several weeks after birth are vital in infants with HDFN.

A novel compound heterozygous variant of the COL11A1 gene in a patient with fibrochondrogenesis type I: the first case in Korea

Jeon Jaesung,Kim Minji,Yoo Sukdong,Kim Yoomi,Cheon Chong Kun 대한소아내분비학회 2024 Annals of Pediatirc Endocrinology & Metabolism Vol.29 No.2

Analysis of Absorption Loss by a Human Body in On-to-Off Body Communication at 2.45 GHz

Jaesung Jeon,Sangwoo Lee,Jaehoon Choi,Sunwoo Kim 한국전자파학회JEES 2015 Journal of Electromagnetic Engineering and Science Vol.15 No.2

This paper investigates the effect of absorption loss by a human body to the received signal strength with respect to on-body transmitting antenna positions in on-to-off wireless body area networks. This investigation is based on measurement results obtained from experiments performed on human bodies (male and female) using planar inverted-F antennas in an anechoic chamber. The total absorption loss by the human body is also presented through the SEMCAD-X simulations. Our investigation showed that the received signal strength becomes lower when the transmitting antenna is mounted at a specific position where more absorption loss is experienced. The statistical analyses of on-to-off body channel characteristics based on the measurement results are presented.

차량 간 통신을 이용한 효과적인 Bulk 등록 기법

전재성(JaeSung Jeon),홍건호(KunHo Hong),이수경(SuKyoung Lee) 한국정보과학회 2011 정보과학회논문지 : 정보통신 Vol.38 No.5

차량 통신망에서는 email, ftp, 비디오 스트리밍 등 인터넷을 통한 서비스를 사용자들에게 제공하기 위해 차량 통신망의 특수성을 고려한 IP 이동성 제공 기술의 연구가 필요하다. 차량의 이동성 관리를 위해 Proxy Mobile IPv6 (PMIPv6)을 차량통신망에 적용하여 다수의 차량들을 한 번에 Local Mobility Anchor (LMA)에 등록하는 Bulk 등록을 사용하면 신호비용을 줄일 수 있지만 시간지연이라는 문제점이 발생한다. 본 논문에서는 차량 간 dedicated short range communication (DSRC)시스템을 이용하여 진입할 차량의 수를 예측하여 Bulk 등록으로 발생하는 시간지연을 줄이며 수치 분석 및 시뮬레이션을 통해, 제안방안이 기존의 방식보다 등록시간과 신호비용 면에서 효율적인 것을 확인하였다. Vehicular Networks needs IP mobility management scheme to provide variety of services such as email, ftp, and video streaming services over the internet. To support IP mobility, if MAG registers a majority of vehicles at a time after Vehicular Networks apply Proxy Mobile IPv6(PMIPv6), can reduce signaling cost. However it may cause a delay time by a bulk registration. In this paper, we use vehicle to vehicle dedicated short range communication (DSRC) system to predict the number of approaching vehicles, so we can reduce time delay. Through simulation results, we show that our proposed bulk registration reduces signaling overhead and time delay when the density of vehicles and the speed of them are high.

WBAN Off-Body 채널에서 안테나 편파의 영향 분석

전재성(Jaesung Jeon),안병직(Byoungjik Ahn),김선우(Sunwoo Kim),최재훈(Jaehoon Choi) 한국전자파학회 2013 한국전자파학회논문지 Vol.24 No.2

본 논문에서는 무선 인체 통신 중 off-body 채널에서 안테나 편파의 변화에 대한 영향을 알아보기 위한 실험을 수행하였다. 실험은 두 수신 안테나의 편파 조합에 따라 총 4가지로 나누었으며, Line-of-Sight(LOS)와 Non-LOS(NLOS)에 따른 영향도 조사하였다. 그리고 인체의 움직임으로 인하여 생기는 안테나 편파의 변화가 신호에 어떠한 영향을 미치는지 알아보기 위해, 인체를 정지한 상태와 움직이는 상태로 나누어 신호 세기를 측정하여 비교하였다. 본 논문의 결과를 통해 수신 안테나의 편파 및 두 수신 안테나의 편파 조합에 따른 성능을 확인하였다. This paper investigates the effect of antenna polarization in Wireless Body Area Network(WBAN) off-body channel. The polarizations of antenna are divided into four combinations regarding Line-of-Sight(LOS) and Non-LOS(NLOS) environment. The human body keeps both still standing and moving to show that the impact of the polarization to signal. This paper confirms the performance depending on the polarization of receiver antenna and the combination of the polarizations on the off-body channel.

2.45 ㎓ On-Body 시스템에서 인체 내부 장기에 따른 채널 모델 특징 연구

전재성(Jaesung Jeon),최재훈(Jaehoon Choi),김선우(Sunwoo Kim) 한국전자파학회 2014 한국전자파학회논문지 Vol.25 No.1

본 논문에서는 WBAN(Wireless Body Area Network) On-body 시스템에서 표면 지향 안테나를 사용하여 인체 내부 기관에 의한 영향을 분석하였다. 인체 내부 기관의 영향을 확인하기 위하여 인체 상반신 모델과 실제 인체에 안테나를 부착하여 수신 신호의 세기를 측정하였다. 실험은 인체에 대한 고유 영향을 보기 위하여 무반향실에서 움직임 없이 수행하였고, VNA(Vector Network Analyzer)를 이용하여 수신 신호 세기를 측정하였다. 측정된 데이터를 이용하여 인체 모델과 상반신 모델의 수신 신호 세기를 비교하였고, 인체 내부 기관이 안테나 수신 신호 세기에 미치는 효과를 분석하였다. In this paper, WBAN(Wireless Body Area Network) On-body system using the surface-oriented antenna about the impact of human internal organs were analyzed through experiments. The received signal strength is measured for effect of human using the human model and the phantom of torso. Experiments are performed in anechoic chamber without moving and measured by Vector Network Analyzer. This paper confirms the effect of human body by comparing the human model and the phantom of torso. And also know the human internal organs effect on the antennas loss of received signal strength by measured data.

차량 환경에 적합한 IP 이동성 관리 알고리즘

전재성(JaeSung Jeon),홍건호(KunHo Hong),이수경(Sukyoung Lee) 한국통신학회 2010 한국통신학회 학술대회논문집 Vol.2010 No.2

차량 통신망에서 성능 효율적인 IP 이동성 관리 기법

전재성(JaeSung Jeon),홍건호(KunHo Hong),이수경(SuKyoung Lee) 한국정보과학회 2010 정보과학회 컴퓨팅의 실제 논문지 Vol.16 No.6

최근 차량 통신망에서는 차량 안전 및 도로 교통 서비스에 더하여, 차량 통신 사용자들에게 email, ftp, 비디오 스트리밍 등 인터넷을 통한 서비스를 제공하기 위한 기술을 개발 중이다. 특히 차량 통신망의 특수성을 고려한 IP 이동성 제공 기술의 연구가 필요하다. 차량의 이동성 관리를 위해 Proxy Mobile IPv6(PMIPv6)를 차량 통신망에 적용할 경우, 차량의 빠른 이동 속도로 위치 등록에 따른 신호비용이 증가되는 문제점을 가지고 있다. 특히 차량 밀도가 높은 도로에서 많은 차량들이 고속으로 이동을 하게 되면 위치등록에 따른 신호비용이 증가하기 때문에 본 논문에서는 이동하는 다수의 차량들을 한 번에 LM (Local Mobility Anchor)에 등록할 수 있는 방법을 제안하여 신호 비용을 줄이는 것을 목표로 한다. 수치 분석 및 시뮬레이션을 통해, 제안방안이 기존의 PMIPv6를 적용한 방식보다 신호 비용 면에서 효율적인 것을 확인하였다. Recently, Vehicular Networks is being developed to provide variety of services such as email, ftp, and video streaming services. As IP mobility technology, Proxy Mobile IP is developed to provide these services for a VANET user. By adopting Proxy Mobile IPv6 (PMIPv6), Vehicular Networks can support IP mobility, but it may cause a proxy binding update (PBU) message when a vehicle moves from one MAG to another. In addition, if the density of vehicles on the road is high, significant PBU messages are generated. In this paper, we propose bulk PBU message to reduce signaling overhead by those PBU messages when a bunch of vehicles move from one MAG to another. When the vehicles move from one MAG to another, it generates only one bulk PBU message to update those vehicle’s location. Through numerical and simulation results, we show that our proposed bulk registration reduces signaling overhead when the density of vehicles and the speed of them are high.

WBAN Off-body 채널에서 안테나의 편파의 영향에 대한 분석

전재성(Jeon Jaesung),안병직(Ahn Byoungjik),김선우(Kim Sunwoo),최재훈(Choi Jaehoon) 한국통신학회 2013 한국통신학회 학술대회논문집 Vol.2013 No.1