• Journal of Yeungnam Medical Science
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• 제31권2호
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• pp.152-156
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• 2014

We report on a patient who showed visual recovery following bilateral occipital lobe infarct, as evaluated by follow up functional magnetic resonance imaging (fMRI) and diffusion tensor tractography (DTT). A 56-year-old female patient exhibited severe visual impairment since onset of the cerebral infarct in the bilateral occipital lobes. The patient complained that she could not see anything, although the central part of the visual field remained dimly at 1 week after onset. However, her visual function has shown improvement with time. As a result, at 5 weeks after onset, she notified that her visual field and visual acuity had improved. fMRI and DTT were acquired at 1 week and 4 weeks after onset, using a 1.5-T Philips Gyroscan Intera. The fiber number of left optic radiation (OR) increased from 257 (1-week) to 353 (4-week), although the fiber numbers for right OR were similar. No activation in the occipital lobe was observed on 1-week fMRI. By contrast, activation of the visual cortex, including the bilateral primary visual cortex, was observed on 4-week fMRI. We demonstrated visual recovery in this patient in terms of the changes observed on DTT and fMRI. It appears that the recovery of the left OR was attributed more to resolution of local factors, such as peri-infarct edema, than brain plasticity.

• 정보과학회 논문지
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• 제43권11호
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• pp.1233-1244
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• 2016

저전력, 저품질의 네트워크 환경인 LLNs(Low power and Lossy Networks) IoT 네크워크 환경에서는 IETF에서 제안한 IPv6 라우팅 프로토콜인 RPL이 대표적으로 사용된다. RPL은 루프가 존재하지 않는 방향성 비순환 그래프(Directed Acyclic Graph)를 생성하는 것을 목표로 하며, 이를 위해 loop avoidance, loop detection 메커니즘과 문제 발생 시 복구를 위한 DIO Poisoning 메커니즘을 정의하고 있다. 하지만, 기존의 DIO Poisoning은 루프 발생 노드에서 일어난 poisoning이 해당 노드의 서브트리로 전파되어 복구 시간과 컨트롤 메시지가 증가하는 문제점을 가지고 있다. 본 논문에서는 RPL 기반 IoT 무선 네트워크에서 루프 복구 과정 시 서브 트리의 라우팅 오버헤드가 추가로 발생할 수 있는 현상을 보완한 효율적인 경로 복구 기법을 제안한다. 개선된 RPL 루프 복구 과정에서는 기존 선호 부모로 선택될 수 없던 경로를 활용하여 빠르게 복구함으로써 새로운 경로설정을 위한 컨트롤 패킷 트래픽과 경로 복구 시간을 줄인다. 시뮬레이션을 사용하여 제안한 프로토콜이 기존 프로토콜에 비해 복구 시간 단축과 컨트롤 패킷의 감소를 통한 복구 성능을 향상시킬 수 있음을 알 수 있었다.

• 동아시아식생활학회지
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• 제19권3호
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• pp.316-326
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• 2009

Recently, local foods have drawn significant attention due to their intrinsic merits. Such foods not only have commercial potential, but also cultural value. Therefore, local foods must be well-maintained and fostered, and a comprehensive plan to develop them must be devised. In this aspect, various factors such as dietary attitudes, perceptions and concerns affecting their development should be considered. The present study was designed to investigate via survey the dietary attitudes, perceptions and concerns towards local foods among married women in Jeollabuk-do. The number of subjects was 434. According to the results, the highest frequency for consuming local foods was '1~3 times/month' for all ages. For the number of local foods subjects had ever tried, '7~8' was the highest overall with 36.8%, followed by '5~6', '3~4', '9~10', and '0~2' with 27.4%, 17.9%, 10.3% and 7.6%, respectively. However, there was a statistically significant difference according to age. The higher the person’s age, the higher the number of local foods they had tried. A similar pattern was shown in the number of local foods subjects had ever cooked. For those in their 20s and 30s, the highest number was '0~2', with 70.8% and 53.0%, respectively, while for those in their 40s the highest number was '3~4' with 38.5%, and for those above 50s it was '5~6' with 31.4%. Most of the subjects realized the need to advance the development of local foods. There were differences among the subjects for certain aspects concerning progression and development, opinions on the major drawbacks of local food development items served more often at home, and different views by age on taste modifications according to modern concepts. From this study, it can be concluded that the utilization of local foods increases with age, and the view that local food development should be based on the recovery and/or maintenance of original tastes becomes more prevalent with age.

• 대한기계학회논문집B
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• 제24권3호
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• pp.443-449
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• 2000

The performance of 2-frame PTV(particle tracking velocimetry) system was improved using an adaptive hybrid scheme. The original 2-frame PTV method based on the match probability concept employs global match parameters for the entire flow field. Since this does not reflect fully the detailed local velocity change, it sometimes reduces the recovery rate of velocity vectors and increases the number of erroneous vectors in the region where an extraordinary flow structure exists. In this study, the preliminary FFT-based PIV results are used as an input parameter to determine the local match parameters needed for the 2-frame particle tracking algorithm. A computer simulation using synthetic particle images was carried out to study the performance of the adaptive 2-frame PTV technique. The adaptive hybrid method shows the better performance with increasing the velocity vector recovery rate and decreasing the computation time, compared to the original 2-frame PTV method.

• Journal of information and communication convergence engineering
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• 제10권3호
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• pp.231-236
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• 2012

For real-time wireless sensor network applications, it is essential to provide different levels of quality of service (QoS) such as reliability, low latency, and fault-tolerant traffic control. To meet these requirements, an (m,k)-firm based real-time routing protocol has been proposed in our prior work, including a novel local transmission status indicator called local DBP (L_DBP). In this paper, a fault recovery scheme for (m,k)-firm real-time streams is proposed to improve the performance of our prior work, by contributing a delay-aware forwarding candidates selection algorithm for providing restricted redundancy of packets on multipath with bounded delay in case of transmission failure. Each node can utilize the evaluated stream DBP (G_DBP) and L_DBP values as well as the deadline information of packets to dynamically define the forwarding candidate set. Simulation results show that for real-time service, it is possible to achieve both reliability and timeliness in the fault recovery process, which consequently avoids dynamic failure and guarantees meeting the end-to-end QoS requirement.

• 한국정보통신학회논문지
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• 제18권9호
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• pp.2087-2093
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• 2014

본 논문에서는 압축적으로 센싱된 희소 신호를 복원하기 위한 유전 알고리듬(GA)에 기반한 직교 정합 추구 방법(GAOMP)을 제안한다. 최근에 제안된 SP, CoSaMP, gOMP 등은 매 반복 단계에서 부적절한 atom을 제거하여 희소 신호의 복원 성능을 개선하였다. 그러나 support set이 국소 최저에 빠져 신호 복원에 실패하는 경우가 발생한다. 제안된 GAOMP는 유전 알고리듬의 중요 연산자인 변이를 통해 support set이 국소 최저를 벗어날 수 있도록 도와주어 희소 신호의 복원 성능을 향상시킨다. 모의 실험을 통해 GAOMP가 여러 OMP 기반 알고리듬과 $l_1$ 최적화보다 우수한 신호 복원 성능을 보임을 알 수 있다.

• Archives of Plastic Surgery
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• 제46권3호
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• pp.189-197
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• 2019

There has been an exponential increase in plastic surgery cases over the last 20 years, surging from 2.8 million to 17.5 million cases per year. Seventy-two percent of these cases are being performed in the office-based or ambulatory setting. There are certain advantages to performing aesthetic procedures in the office, but several widely publicized fatalities and malpractice claims has put the spotlight on patient safety and the lack of uniform regulation of office-based practices. While 33 states currently have legislation for office-based surgery and anesthesia, 17 states have no mandate to report patient deaths or adverse outcomes. The literature on office-base surgery and anesthesia has demonstrated significant improvements in patient safety over the last 20 years. In the following review of the proceedings from the PRS Korea 2018 meeting, we discuss several key concepts regarding safe anesthesia for office-based cosmetic surgery. These include the safe delivery of oxygen, appropriate local anesthetic usage and the avoidance of local anesthetic toxicity, the implementation of Enhanced Recovery after Surgery protocols, multimodal analgesic techniques with less reliance on narcotic pain medications, the use of surgical safety checklists, and incorporating "the patient" into the surgical decision-making process through decision aids.

• 유통과학연구
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• 제14권10호
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• pp.29-38
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• 2016

Purpose - This research examines the effects of local universities on urban regeneration to recover commercial supremacy in the original urban area and provides clear information on the "University Cooperation Project for Traditional Market." Research design, data, and methodology - The "University Cooperation Project for Traditional Market" started in 2015. This study was conducted focusing on 22 places selected in 2015 and the project content in those locations. Results - This study analyzes the link to urban regeneration and spreads the concept along with theoretical consideration of university cooperation for traditional markets. Additionally, it promotes policies to help propel the project based on characteristics of the region. Conclusions - A differentiated project should be created, with characteristics of the region reflected, and detailed programs developed and implemented resulting in meaningful achievement from the perspective of members of the local community, who may have deviated from existing perspectives. Additionally, opportunities should be established for the direct application of young consumer ideas through experimental business to regenerate the traditional market (commercial supremacy), the center of the local economic society.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.256-256
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• 2000

In this parer, we present a real-time path planning algorithm which is integrated the artificial potential field(APF) and simulated annealing(SA) methods for mobile robot. The APF method in path planning has gained popularity since 1990's. It doesn't need the modeling of the complex configuration space of robot, and is easy to apply the path planning with simple computation. However, there is a major problem with APF method. It is the formation of local minima that can trap the robot before reaching its goal. So, to provide local minima recovery, we apply the SA method. The effectiveness of the proposed algorithm is verified through simulation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 G
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• pp.3086-3088
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• 1999

An ultrasonic sensor is one of most popular sensor used to navigate mobile robots within environments containing obstacles. But many navigation algorithm have studied because of the drawback of ultrasonic sensor such that poor directionality, frequent misreadings, specular reflections. Also, the most crucial drawback of this algorithm, that is VFF, VFM, EDM, PFM, WFM, GFM etc. has been that the mobile robot may become trapped in a local minimum. In this paper, we present a theoretical study of a navigation algorithm which integrals a heuristic-search local minimum (or trap) recovery method with a vector-field based method to maneuver cylindric mobile robots in unknown of unstructured environments. Also, an autonomous mobile robot uses dead-reckoning to estimate the current position and orientation of a mobile robot.