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임피던스 매칭과 필드 매칭을 이용한 20[GHz] Microstrip-to-CPW Transition 설계
윤재광,김동호,박종대 明知大學校 産業技術硏究所 2009 産業技術硏究所論文集 Vol.28 No.-
A compact design of 20[GHz] Microstrip-to-CPW(coplanar waveguide) transition using Impedance matching and field matching is proposed in this paper. The transition is comprise of CBCPW(conductor backed coplanar waveguide), which is connected to Microstrip and CPW for reducing reflection loss by field and impedance mismatching‘ In this paper, varying Ground shapes and via positions are offered for field and impedance matching. Because simulation and measurement results show broadband characteristic, this transition can be very useful in various UWB component MMICs and MICs.
윤재광,이한필,이근동,김형렬,김용희,김동관,박승일,최세훈 대한의학회 2019 Journal of Korean medical science Vol.34 No.45
Background: Over the past few decades, demographics information has changed significantly in patients with surgically resected lung cancer. Herein, we evaluated the recent trends in demographics, surgery, and prognosis of lung cancer surgery in Korea. Methods: Patients with surgically resected primary lung cancer from 2002 to 2016 were retrospectively analyzed. Multivariable Cox regression analysis was conducted to identify prognostic factors for overall survival. The annual percent change (APC) and statistical significance were calculated using the Joinpoint software. Results: A total of 7,495 patients were enrolled. Over the study period, the number of lung cancer surgeries continued to increase (P < 0.05). The proportion of women to total subjects has also increased (P < 0.05). The proportion of elderly patients (≥ 70 years) as well as those with tumors measuring 1–2 cm and 2–3 cm significantly increased in both genders (all P < 0.05). The proportion of patients with adenocarcinoma, video-assisted thoracic surgery, sublobar resection, and pathological stage I significantly increased (P < 0.05). The 5-year overall survival rate of lung cancer surgery increased from 61.1% in 2002–2006 to 72.1% in 2012–2016 (P < 0.001). The operative period was a significant prognostic factor in multivariable Cox analysis (P < 0.001). Conclusion: The mean age of patients with lung cancer surgery increased gradually, whereas tumor size reduced. Prognosis of lung cancer surgery improved with recent increases in the frequency of adenocarcinoma, video-assisted thoracic surgery, sublobar resection, and pathological stage I. The operation period itself was also an independent prognostic factor for overall survival.
디지털 트윈 기반의 도메인 독립 회전 기계 고장 진단 시스템
윤재광,김관필,김세은,이예슬 한국인공지능교육학회 2023 인공지능연구 논문지 Vol.4 No.3
최근 딥러닝의 발전에 따라 데이터 기반 진단 모델에 대한 연구가 활발히 이루어지고 있다. 하지만 진단 모델 학습을 위해 고품질 의 학습 데이터를 필요로 하는데, 이는 데이터 수집에 상당한 비용이 든다. 또한 수집된 데이터 기반 진단 모델이 현장의 다양한 운영 조건에 따른 도메인 차이로 인해 진단 성능에 한계가 발생하게 된다. 본 논문에서는 디지털 트윈을 이용해 다양한 고장 데이 터를 생성해 데이터 수집에 드는 비용을 절감하고, 도메인 적응 기술을 이용해 일반화된 진단 결과를 얻는 새로운 프레임워크를 제 안한다. Matlab을 이용해 디지털 트윈 진동 데이터를 생성해 진단 모델을 학습하고 CWRU 데이터를 이용한 진단 모델 실험에서, 도메인 적응전 61%의 정확도가 적응 후 73%로 향상되었고, 이 결과를 통해 디지털 트윈을 이용한 진단 모델의 활용 가능성과 이를 이용한 진단을 수행할 때 발생하는 도메인 불일치 문제를 도메인 적응을 통해 일반화된 성능을 나타낼 수 있는 가능성을 보았다. Recent advancements in deep learning have led to active research in data-driven diagnostic models. However, acquiring high-quality training data for these models entails substantial costs. Moreover, diagnostic models based on collected data often face performance limitations due to domain differences resulting from varied operational conditions in the field. This paper introduces a new framework that leverages digital twins to generate diverse fault data, reducing data collection costs, and utilizes domain adaptation techiniques to attain generalized diagnostic outcomes. Using Matlab to create digital twin vibration data and training diagnostic models, an experiment with CWRU data revealed an increase in accuracy from 61% before domain adaptation to 73% afterward. These findings highlight the viaility of digital twin based diagnostic models and the potential of domain adaptation to overcome domain mismatch issues, thereby enhancing generalized diagnostic performance.
Clinical Outcomes of Heart-Lung Transplantation: Review of 10 Single-Center Consecutive Patients
윤재광,최세훈,박승일,Asan Medical Center Heart-Lung Transplantation Team 대한흉부외과학회 2016 Journal of Chest Surgery (J Chest Surg) Vol.49 No.3
Background: Heart-lung transplantation (HLT) has provided hope to patients with end-stage lung disease and irreversible heart dysfunction. We reviewed the clinical outcomes of 10 patients who underwent heart-lung transplantation at Asan Medical Center. Methods: Between July 2010 and August 2014, a total of 11 patients underwent HLT at Asan Medical Center. After excluding one patient who underwent concomitant liver transplantation, 10 patients were enrolled in our study. We reviewed the demographics of the donors and the recipients’ baseline information, survival rate, cause of death, and postoperative complications. All patients underwent follow-up, with a mean duration of 26.1±16.7 months. Results: Early death occurred in two patients (20%) due to septic shock. Late death occurred in three patients (38%) due to bronchiolitis obliterans (n=2) and septic shock (n=1), although these patients survived for 22, 28, and 42 months, respectively. The actuarial survival rates at one year, two years, and three years after HLT were 80%, 67%, and 53%, respectively. Conclusion: HLT is a procedure that is rarely performed in Korea, even in medical centers with large heart and lung transplant programs. In order to achieve acceptable clinical outcomes, it is critical to carefully choose the donor and the recipient and to be certain that all aspects of the transplant procedure are planned in advance with the greatest care.
윤재광,방지현,김영휘,구현우,박정준 대한흉부외과학회 2016 Journal of Chest Surgery (J Chest Surg) Vol.49 No.2
Hypoplastic left heart complex (HLHC) consists of less severe underdevelopment of the left ventricle without intrinsic left valvular stenosis, i.e., a subset of hypoplastic left heart syndrome (HLHS). HLHC patients may be able to undergo biventricular repair, while HLHS requires single ventricle palliation (or transplant). However, there is no consensus regarding the likelihood of favorable outcomes in neonates with HLHC selected to undergo this surgical approach. This case report describes a neonate with HLHC, co-arctation of the aorta (CoA), and patent ductus arteriosus (PDA) who was initially palliated using bilateral pulmonary artery banding due to unstable ductus-dependent circulation. A postoperative echocardiogram showed newly appearing CoA and progressively narrowing PDA, which resulted in the need for biventricular repair 21 days following the palliation surgery. The patient was discharged on postoperative day 13 without complications and is doing clinically well seven months after surgery.
Extra-anatomic Aortic Bypass for the Management of Mid-Aortic Syndrome Caused by Takayasu arteritis
윤재광,김준범 대한흉부외과학회 2015 Journal of Chest Surgery (J Chest Surg) Vol.48 No.1
Lower limb ischemia caused by multiple stenosis of the thoracoabdominal aorta is one of the rare clinical manifestationsof Takayasu arteritis. The optimal management of such mid-aortic syndrome related with Takayasu arteritishas not been established to date. Here we report a case of extra-anatomic aortic bypass through minimally invasivetechniques to treat lower limb ischemia caused by Takayasu arteritis.
윤재광(JayKwang Yun),탁진현(JinHyun Tak),백영태(YongTae Baek),이세훈(SeHoon Lee) 한국컴퓨터정보학회 2007 한국컴퓨터정보학회지 Vol.15 No.1
최근 홈페이지 기반의 다양한 기능이 개발, 적용되고 있어 웹사이트 재구축시 기능 개선 등의 이유보다는 디자인 재구성을 통한 인터페이스 개선을 꼽는 경우가 대다수로 나타나고 있다. 본 논문은 디자인 변경을 위해 기능 전체를 재개발하는 것이 아니라 개발된 템플릿을 활용하여 인터페이스를 변경하는 방법을 제안하고자 한다. 이 방법은 웹사이트 재구축시 개발 기간의 단축, 비용의 절감, 필요 인력의 최소화 등의 이점을 얻을 수 있다.