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박찬이,전성룡,우경인,장혜란,Chan Yi Park,Seong Lyong Jeon,Kyung In Woo,Hae Ran Chang 대한안과학회 2007 대한안과학회지 Vol.48 No.2
Purpose: To study the frequency and aspects of ptosis in Koreans aged 50 years or older. Methods: In this study, 377 elderly people visiting retirement center were included. Margin-reflex distance 1 (MRD1) and palpebral fissure (PF) were evaluated with an attempt to eliminate eyebrow elevation. Levator function (LF) was measured with Berke`s method. If the measured MRD1 was less than 2 mm, ptosis was diagnosed and its frequency, relation to sex, age, levator function and superior deep sulcus were investigated. Results: There was a correlation between decreasing MRD1, PF and LF with increasing age. Ptosis was observed in 207 subjects (54.9%), and its frequency was augmented as age increased. Although it was not statistically significant, the levator function of those with ptosis (10.0±1.9 mm) was lower than those without ptosis (11.3±1.9 mm). Questionnaires were administered and 196 respondents (51%) said that their eyelid droop had become more pronounced over time. Among these respondents, 33 (16.1%) indicated that their droopy eyelid causes discomfort by blocking their vision. Their MRD1 was 1.2±1.0 mm, which was significantly lower than that of the other 163 respondents (1.8±1.1 mm, P<0.05). Conclusions: Koreans aged 50 years or older showed a very high frequency (54.9%) of ptosis and as age increased, the frequency of ptosis also increased. Surgical correction is recommended when the ptosis causes patient discomfort due to impaired vision.
전술망의 서비스 품질 보장을 위한 다계층 네트워크 가상화 기법
김요한,안남원,박주만,박찬이,임혁,Kim, Yohan,An, Namwon,Park, Juman,Park, Chan Yi,Lim, Hyuk 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.4
Tactical networks are evolving into an All-IP based network for network centric warfare(NCW). Owing to the flexibility of IP based network, various military data applications including real-time and multi-media services are being integrated in tactical networks. Because each application has diverse Quality-of-service(QoS) requirements, it is crucial to develop a QoS provisioning method for guaranteeing QoS requirements efficiently. Conventionally, differentiated services(DiffServ) have been used to provide a different level of QoS for traffic flows. However, DiffServ is not designed to guarantee a specific requirement of QoS such as delay, loss, and bandwidth. Therefore, it is not suitable for military applications with a tight bound of QoS requirements. In this paper, we propose a multi-layer network virtualization scheme that allocates traffic flows having different QoS requirements to multiple virtual networks, which are constructed to support different QoS policies such as virtual network functions(VNFs), routing, queueing/active queue management(AQM), and physical layer policy. The experiment results indicate that the proposed scheme achieves lower delays and losses through multiple virtual networks having differentiated QoS policies in comparison with conventional networks.