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Jae-Ryong Cha,Han Wook Kim,Doo Guen Yang,Hee-Yoon Chung,Il-Yeong Hwang 대한정형외과학회 2020 Clinics in Orthopedic Surgery Vol.12 No.4
Background: The purpose of this study was to evaluate the clinical usefulness of open-door laminoplasty using lateral mass anchoring screws and nonabsorbable sutures (ODLLM) for multilevel cervical myelopathy. Methods: We retrospectively studied 30 patients who underwent ODLLM. Clinical evaluations were performed using a visual analog scale (VAS), Japanese Orthopaedic Association (JOA) score, and Neck Disability Index (NDI) preoperatively, at 1 year postoperatively, and at the last follow-up. Radiographic evaluation was done using cervical spine radiographs to measure changes in the lordotic angle and range of motion (ROM) preoperatively, at 1 year postoperatively, and at the last follow-up and computed tomography at 1 year postoperatively to measure the opening angle and anteroposterior diameter of the spinal canal. Results: Significant improvement in VAS, JOA, and NDI was seen overall at 1 year after operation. However, there was no significant difference between 1 year after operation and the last follow-up. There were no significant changes in the lordotic angle and neck ROM. The mean opening angle of the opened lamina was measured as 39.04°. The mean anteroposterior diameter was significantly increased from 7.51 ± 1.79 mm before surgery to 13.98 ± 1.80 mm at 1 year of operation. Complications such as laminar reclosure and screw loosening were not observed in all cases. Conclusions: The ODLLM was technically easy to perform and showed good results comparable to those of conventional techniques. It can be suggested that ODLLM is an appropriate treatment option for multilevel cervical myelopathy.
Cha, Jae-Ryong,Hwang, Il-Yeong,Kwon, Sun-Hwan,Chung, Hee-Yoon The Korean Neurosurgical Society 2020 Journal of Korean neurosurgical society Vol.63 No.2
Objective : To evaluate and compare the clinical and radiographic features of 25 patients with infectious spondylitis treated with anterior debridement and reconstruction using autogenous bone grafts vs. a metal cage with allogenic bone grafts. Methods : The study analyzed 25 patients diagnosed with infectious thoracolumbar spondylitis who underwent anterior radical debridement and reconstruction. Autogenous bone grafts were used in 13 patients (group 1), and a metal cage with allogenic bone grafts was used in 12 patients (group 2). Clinical outcomes were assessed by the visual analogue scale (VAS) scores and neurological status. Additionally, the serological results and the radiographic results using the sagittal Cobb angle were compared. Fusion was evaluated by computed tomography (CT) imaging at 24 months postoperatively. Results : Both groups showed a significant decrease in the postoperative mean VAS scores; however, only, group 1 patients showed a significantly higher VAS score than group 2 patients, 1 month postoperatively (p=0.002). The postoperative neurological status significantly improved. Elevated C-reactive protein levels and erythrocyte sedimentation rate values returned to normal limits at the 2-year follow-up without recurrent infection. No significant intergroup difference was observed in Cobb angle. Bony fusion was confirmed in all patients at CT 24 months postoperatively. Conclusion : Although the use of a metal cage with allogenic bone grafts for anterior column reconstruction remains controversial, our results suggest that it can be considered as an effective treatment of option for anterior column reconstruction in patients with infectious spondylitis.
A Distributed Sequential Link Schedule Combined with Routing in Wireless Mesh Networks
Jae-Ryong Cha,Jae-Hyun Kim 한국전자통신연구원 2012 ETRI Journal Vol.34 No.3
This letter proposes a new distributed scheduling scheme combined with routing to support the quality of service of realtime applications in wireless mesh networks. Next, this letter drives average end-to-end delay of the proposed scheduling scheme that sequentially schedules the slots on a path. Finally,this letter simulates the time division multiple access network for performance comparison. From the simulation results,when the average number of hops is 2.02, 2.66, 4.1, 4.75, and 6.3, the proposed sequential scheduling scheme reduces the average end-to-end delay by about 28%, 10%, 17%, 27%, and 30%, respectively, compared to the conventional random scheduling scheme.
무선 센서 네트워크에서 지연에 민감한 정보의 다중 홉 전송 기법
차재룡(Jae-Ryong Cha),김재현(Jae-Hyun Kim) 한국통신학회 2012 韓國通信學會論文誌 Vol.37 No.10C
본 논문에서는 무선 센서네트워크(wireless sensor network : WSN)에서 발생하는 두 가지 지연 요인인 큐잉지연(queueing delay)과 랜덤 링크 스케줄링에 의한 지연(delay by random link scheduling)을 소개하고 이를 해결하기 위한 새로운 순차적 스케줄링 기법을 제안한다. 또한 모의 실험을 통하여 이용하여 제안한 다중 홉 전송기법의 성능 평가를 수행하고, 이를 기존의 랜덤 링크 스케줄링 기법의 성능과 종단간 패킷 전송 지연의 관점에서 비교한다. 모의실험 결과에 따르면, 소스 노드(source node)와 목적지 노드(destination node) 사이의 홉 수(hop distance)가 증가할수록 제안한 스케줄링 기법과 기존의 랜덤 링크 스케줄링 기법의 지연 성능 차이가 증가함을 알 수 있었다. 소스 노드와 목적지 노드 사이의 평균 홉 수가 2.66, 4.1, 4.75 및 6.3 일 때, 제안한 스케줄링 기법은 기존의 랜덤 링크 스케줄링 기법에 비해 22%, 36%, 48% 및 55% 까지 지연 시간을 줄일 수 있었다. This paper introduces two multi-hop delay factors which can be caused by conventional TDMA scheduling; queueing delay and delay by random link scheduling, and proposes a new sequential scheduling scheme to resolve these two factors. We also simulate the TDMA network with the proposed link scheduling scheme and compare it with conventional(random) link scheduling scheme in terms of end-to-end packet transmission delay. From the simulation results, the more the average hop distance increases, the more the difference of the delay performance of both scheduling schemes increases. When the average number of hops is 2.66, 4.1, 4.75, and 6.3, the proposed sequential scheduling scheme reduces the average end-to-end delay by about 22%, 36%, 48%, and 55% respectively when compared to the random scheduling scheme.
슬와 낭종 내부의 비석회화성 유리체로 발현된 원발성 활액막성 연골종증
차재룡(Jae-Ryong Cha),서재희(Jae-Hee Suh),장성호(Sung-Who Chang),박기봉(Ki-Bong Park) 대한정형외과학회 2021 대한정형외과학회지 Vol.56 No.4
저자들은 좌측 슬관절 슬와부 종창으로 내원한 56세 남성 환자에 대해 자기공명영상 검사를 시행하여 슬와 낭종과 슬와 낭종 내부의 비석회화성 유리체를 확인하였다. 절개 생검술을 통한 조직 검사를 통해 비석회화성 유리체를 활액막성 연골종증으로 진단하였기에 슬관절의 관절 외 활액막성 연골종증에 대한 문헌 고찰과 함께 보고하는 바이다. A magnetic resonance imaging test was performed on a 56-year-old male patient, who visited with a one-month history of painless swelling at the popliteal area of the left knee. A popliteal cyst and non-calcified loose body in the cyst were identified. Synovial chondromatosis was diagnosed from a histology examination by excision and biopsy. This paper reports this case of extra-articular synovial chondromatosis of the knee with a review of the relevant literature.