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조재형(JaeHyung Cho),안우주(WooJoo Ahn),공우식(WooSik Kong),지승한(SeungHan Ji) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.12
최근 현대사회에서 SLAM을 이용한 기술은 자율 주행 자동차, 자율로봇의 분야에 적용되고 있으며, 이동이 필요한 로봇을 개발하는 과정에서 가장 어려운 기술은 위치 인식이다. 이와 같은 기술 해결을 위해 다양한 센서를 이용한 SLAM에 관한 연구가 계속되고 있다. 해당 연구에서는 센서별 장점을 활용하고 단점을 보완하는 방식으로 연구를 진행하고자 하며 구체적으로 다중 stereo scopic IR Depth camera, 모터 인코더, IMU 3가지의 센서 퓨전을 통해, 특징이 적은 환경에서 로봇의 위치 인식 성능 향상을 위한 센서 퓨전을 적용해보고 기존 SLAM의 성능을 향상하고자 한다. Recently, in modern society, technology using SLAM is being applied to the fields of autonomous vehicles and autonomous robots, and the most difficult technology in the process of developing robots that need movement is location recognition. In order to solve such a difficulty, research on SLAM using various sensors is continuing. This study aims to utilize the advantages of each sensor and compensate for the disadvantages, and specifically, to apply sensor fusion to improve the robots location recognition performance in a less characteristic environment and improve the performance of existing SLAM.
Spurious RTO를 위한 효율적인 혼잡윈도우 회복 기법
이재형 ( Jaehyung Lee ),안수빈 ( Soobeen Ahn ),추현승 ( Hyunseung Choo ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.1
인터넷상에서 TCP 프로토콜은 사실상 표준으로써 널리 이용되고 있다. 그러나 네트워크 환경이 발전해 감에 따라서 무선 네트워크, CDMA, 3G 네크워크등 다양한 환경이 공존하게 되었고, 이러한 환경에서 TCP의 성능저하가 이슈가 되어 많은 연구가 진행되었으며, 많은 알고리즘들이 발표되었다. 본 논문에서는 무선환경에서 다양한 TCP 성능저하 원인 중에서 spurious RTO에 관한 문제를 해결하고자 한다. 이 전의 연구인 E-RTO는 delay spike문제를 효과적으로 다루고 있다 하지만 delay spike이후 혼잡 윈도우를 회복하는 과정을 효과적으로 다루고 있지 못하다. 우리는 BCR를 제안하여 이러한 문제를 해결하고자 한다. BCR의 성능평가는 NS2를 이용하여 이루어 졌으며 throughput, goodput에서 좋은 성능을 보여주고 있다.
Percutaneous Sacroplasty : Effectiveness and Long-Term Outcome Predictors
Lee, Jaehyung,Lee, Eugene,Lee, Joon Woo,Kang, Yusuhn,Ahn, Joong Mo,Kang, Heung Sik The Korean Neurosurgical Society 2020 Journal of Korean neurosurgical society Vol.63 No.6
Objective : To evaluate the effectiveness and long-term outcome predictors of percutaneous sacroplasty (PSP). Methods : This single-center study assessed 40 patients with sacral insufficiency fractures using the short-axis technique under C-arm flat-panel detector computed tomography (CT). Two radiologists reviewed the patients' magnetic resonance and CT images to obtain imaging findings before PSP and determine technical success, respectively. The short-term outcomes were visual analog scale score changes and opioid usage reductions. Long-term outcomes were determined using telephone interviews and the North American Spine Society (NASS) patient-satisfaction index at least one year after PSP. Results : Technical success was achieved without any significant complications in 39 patients (97.5%). Telephone interviews were possible with 12 patients and failed in 10 patients; death was confirmed in 18 patients. Fifteen patients (50%) re-visited the hospital and received conservative treatment, including spinal injections. Nine patients reported positive satisfaction (NASS patient-satisfaction index 1 or 2), while the negative satisfaction group (NASS patient-satisfaction index 3 or 4, n=3) showed a higher incidence of compression fractures at the thoracolumbar spine level (66.7% vs. 22.2%) and previous spinal injection history (66.7% vs. 33.3%). The poor response group also showed higher incidences of facet joint arthrosis (100% vs. 55.6%), central canal stenosis (100% vs. 22.2%), neural foraminal stenosis (33.3% vs. 22.2%), scoliosis (100% vs. 33.3%), and sagittal malalignment (100% vs. 44.4%). Conclusion : PSP was effective for sacral insufficiency fractures and showed good long-term outcomes. Combined compression fractures in the thoracolumbar spine and degenerative lumbar pathologies could be possible poor outcome predictors.
Yoo, Jun Ho,Ahn, Jaemoon,Oh, Jaeryung,Cha, Jaehyung,Kim, Seong-Woo British Medical Association 2017 British journal of ophthalmology Vol.101 No.10
<P>Conclusions Patients with BRVO with non-perfusion of more than half of the 1 mm zone of the ETDRS circle or with an initial CRT >570 mu m should be closely monitored for macular oedema recurrence within 6 months of IVB injection.</P>
Pyun Jung-Hoon,Ahn Byeong-Yun,Vuong Tuan Anh,Kim Su Woo,조윤주,Jeon Jaehyung,Baek Seung Ho,Kim Jaewon,Park Sungsu,배규운,Choi Jun-Hyuk,Kim Jae-Ryong,Ryu Dongryeol,Lee Sang-Jin,강종순 생화학분자생물학회 2021 Experimental and molecular medicine Vol.53 No.-
Vascular smooth muscle cells (VSMCs) have remarkable plasticity in response to diverse environmental cues. Although these cells are versatile, chronic stress can trigger VSMC dysfunction, which ultimately leads to vascular diseases such as aortic aneurysm and atherosclerosis. Protein arginine methyltransferase 1 (Prmt1) is a major enzyme catalyzing asymmetric arginine dimethylation of proteins that are sources of asymmetric dimethylarginine (ADMA), an endogenous inhibitor of nitric oxide synthase. Although a potential role of Prmt1 in vascular pathogenesis has been proposed, its role in vascular function has yet to be clarified. Here, we investigated the role and underlying mechanism of Prmt1 in vascular smooth muscle contractility and function. The expression of PRMT1 and contractile-related genes was significantly decreased in the aortas of elderly humans and patients with aortic aneurysms. Mice with VSMC-specific Prmt1 ablation (smKO) exhibited partial lethality, low blood pressure and aortic dilation. The Prmt1-ablated aortas showed aortic dissection with elastic fiber degeneration and cell death. Ex vivo and in vitro analyses indicated that Prmt1 ablation significantly decreased the contractility of the aorta and traction forces of VSMCs. Prmt1 ablation downregulated the expression of contractile genes such as myocardin while upregulating the expression of synthetic genes, thus causing the contractile to synthetic phenotypic switch of VSMCs. In addition, mechanistic studies demonstrated that Prmt1 directly regulates myocardin gene activation by modulating epigenetic histone modifications in the myocardin promoter region. Thus, our study demonstrates that VSMC Prmt1 is essential for vascular homeostasis and that its ablation causes aortic dilation/dissection through impaired myocardin expression.