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조윤현,윤인섭,박효달,김상욱 한국전자통신학회 2016 한국전자통신학회 논문지 Vol.11 No.1
In this paper, studied on MAC(Media Access Control) protocol for UAVs application. As an increasing the number of UAVs, at the same time need to control the number of UAVs on the ground control station is also increased. So, CSMA/CA that used in current civil aircraft applied to UAV communications and verified the applicability. And changes message sizes, then compare the throughput and delays of data. In the results, we confirmed applicability for UAVs MAC protocol. 본 논문에서는 점차 쓰임새가 다양해지는 무인항공기의 매체접속제어 프로토콜 적용에 관한 연구를 수행하였다. 무인항공기의 대수가 증가함에 따라 지상통제소에서 동시에 제어해야할 항공기의 대수도 증가하게 된다. 이를 위해 현재 민간항공기에서 사용하는 다중접속제어 방식인 CSMA/CA를 무인항공기 통신방식에 적용하여 이의 적용 가능성을 확인하였으며, 메시지 크기를 달리하여 데이터의 처리량 및 지연시간을 비교하였다. 그 결과 무인항공기 매체접속제어 적용가능성을 확인해볼 수 있었다.
조윤현,Dae-Yeon Kim,Jong-Hyeok Kim,Yong-Man Kim,Young-Tak Kim,남주현 대한부인종양학회 2009 Journal of Gynecologic Oncology Vol.20 No.1
Objective: To compare the efficacy of neoadjuvant chemotherapy with paclitaxel plus platinum followed by radical hysterectomy with radical surgery alone in patients with stage IB2-IIA bulky cervical cancer. Methods: From November 1999 to September 2007, stage IB2-IIA cervical cancers with tumor diameter >4 cm, as measured by MRI, were managed with two cycles of preoperative paclitaxel and platinum. As a control group, we selected 35 patients treated with radical surgery alone. Results: There were no significant between group differences in age, tumor size, FIGO stage, level of SCC Ag, histopathologic type and grade. Operating time, estimated blood loss, the number of lymph nodes yielded and the rate of complications were similar in the two groups. In surgical specimens, lymph-vascular space invasion (LVSI), nodal metastasis and parametrial involvement did not differ significantly between the two groups. In the neoadjuvant group, pathologic tumor size was significantly smaller and fewer patients had deep cervical invasion. Radiotherapy, alone and in the form of concurrent chemoradiation, was administered to more patients treated with radical surgery alone (82.9% vs. 52.9%, p=0.006). No recurrence was observed in patients who could avoid adjuvant radiotherapy owing to improved risk factors after neoadjuvant chemotherapy. There were no significant differences in 5-year disease free and overall survival. Conclusion: As neoadjuvant chemotherapy would improve pathologic prognostic factors, adjuvant radiotherapy can be avoided, without worsening the prognosis, in patients with locally advanced bulky cervical cancer. Neoadjuvant chemotherapy would be improving the quality of life after radical hysterectomy in patients with bulky cervical cancer.
System identification technique for control of hybrid bio-system
조윤현,허훈 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.12
Effective and accurate system parameters in physical system are crucial for the analysis and prediction of dynamic performance and to conduct control. A hybrid bio-system combined using solid and flexible bio-elements is adopted as the target system in this study. Each individual system has its own nonlinearity in nature. A flexible muscle is represented using a Hill-type model. In addition, the hybrid dynamic system exhibiting nonlinearity is modeled using the Hammerstein-Wiener model. These nonlinearities are characterized through piecewise linear approaches. The dynamics and control performance of the systems using the proposed nonlinear system identification are compared with those of linear system identification. Simulation results show the feasibility of the proposed nonlinear system identification technique in extracting effective system parameters with a varying piecewise linearity. Moreover, the possibility of bio-system control is qualitatively revealed. A sequential PID control scheme also shows its successful performance for a hybrid bio-system.
X-Y Table 구동형 선형펄스모터의 설계 및 특성 고찰
조윤현 東亞大學校 附設 情報通信硏究所 1996 情報通信硏究所論文誌 Vol.4 No.1
The linear pulse motor is essentially a digital device with one step of input for each input current pulse. The input pulses are supplied through power electro devices such as power transistors and FETs switched by digital controllers. linear pulse motors are finding a wide range of application for the Factory-Automation or the Office-Automation.. Typically, LPM provides for a reliable and precise control of position, velocity, or acceleration without using a closed-loop system. Thus some of the advantages of LPMs are ease of control, step multiplication, static and dynamic positioning, and locking force. In order to develope a LPM and its controller for X-Y table application, this paper presents a single-sided linear pulse motor with two permanent magnets. To analyze the characteristics of LPM which is composed of the permanent magnets and irons, the flux density, the thrust and normal force etc. are calculated by the F. E. M and magnetic equivalent method which is considered the magnetic saturation phenomena. The position and velocity of LPM are controlled by using the 80C196KC micro-processor.
Mutational Analysis of KRAS, BRAF, and TP53 Genes of Ovarian Serous Carcinomas in Korean Women
조윤현,김대연,Jong-Hyeok Kim,Yong-Man Kim,Kyu-Rae Kim,남주현,Young-Tak Kim 연세대학교의과대학 2009 Yonsei medical journal Vol.50 No.2
Purpose: To assess the prevalence of KRAS, BRAF, and TP53 mutations in cases of low-grade and high-grade serous carcinomas and to evaluate the clinical outcomes of these morphologically distinct carcinomas. Materials and Methods: Patients with primary invasive serous carcinomas were classified according to the universal grading system. Grade 2 serous tumors were excluded. A total of 100 patients were included for clinical evaluation. Thirty-seven patients, including 20 with low-grade and 17 with high-grade carcinomas, were selected for mutational analysis. Results: The low-grade carcinoma group was characterized by young age and premenopausal period compared with the high-grade carcinoma group, but there were no statistically significant differences in stage, metastasis of lymph node and residual disease. There were no statistically significant differences in survival rates, however, the low-grade carcinoma group showed a trend for improved progression-free survival compared with the high-grade carcinoma group of early stage (p = 0.064). Mutations in KRAS and BRAF were found in 6 (30%) and 2 (10%) patients in the low-grade carcinoma group, respectively, however, they were not found in the high-grade carcinoma group. KRAS and BRAF mutations were mutually exclusive, and both mutations were observed in 40% (8/20). The frequency of TP53 mutations in low-grade and high-grade carcinoma groups were found in 20% (4/20) and 70.6% (12/17), respectively (p = 0.009). Conclusion: Low-grade serous carcinoma shows mutation pattern different from that with high-grade carcinoma. As there were no significant differences in stage distribution and survival, especially in advanced stage, we suggest that more studies are needed to segregate these patients into distinct disease entities.