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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.
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.
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.
감염성 심내막염과 동반된 세균성 슬관절 활액막염 환자에서 나타난 건측 상하지 위약: 감염성 심내막염으로 인한 색전 경색
차재룡(Jae-Ryong Cha),박기봉(Ki-Bong Park),장성민(Seong-Min Jang) 대한정형외과학회 2022 대한정형외과학회지 Vol.57 No.2
저자들은 발열과 동반한 우측 슬관절 통증으로 내원한 82세 남자 환자를 세균성 활액막염으로 진단하고 관절경하 대량 세척술 및 활액막 절제술을 시행하였다. 술 후 1일째 건측 상하지의 위약감이 발생하여 뇌 자기공명영상 검사를 통하여 색전 경색증을 진단하였으며, 순차적으로 시행한 경식도 심초음파에서 승모판의 감염성 심내막염을 확인하였다. 내원 당시 환자의 생체 징후, 말초백혈구 수, 균혈증의 유무, 균 동정 결과를 통해 감염성 심내막염의 동반 가능성을 예측해 볼 수 있었기에 문헌 고찰과 함께 보고하는 바이다. An 82-year-old man visited with fever and severe pain in the right knee. Septic arthritis was confirmed by magnetic resonance imaging (MRI) and joint fluid analysis, and the patient underwent arthroscopic synovectomy and received empirical antibiotic therapy. One day later, motor weakness of contralateral upper and lower limbs developed. Brain MRI confirmed embolic infarction and transthoracic echocardiography confirmed mitral valve infective endocarditis. This paper reports a case of motor weakness after arthroscopic synovectomy for septic arthritis of the knee and provides a review of relevant literature regarding infective endocarditis.