• 융합신호처리학회논문지
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• 제7권3호
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• pp.136-142
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• 2006

공유 메모리 관리를 위한 기존의 방법들은 가상 큐 길이의 정적 제한을 통해 일정 크기의 버퍼 할당을 보장하려는 방식과 전체 버퍼 공간의 할당 측면에서 공유 버퍼의 이용률을 높이고자 하는 방식 등으로 나눌 수 있다. 완전공유 방식의 경우 낮은 트래픽 부하에서 높은 메모리 공유 효과를 보이나 트래픽 부하가 높아지면 특정 가상큐가 공유 메모리를 과다하게 점유하는 것을 방지하는 의미에서의 보호 효과를 거의 기대하기 힘들다. 반대로 정적 임계치 방식의 경우 트래픽 조건 변화에 따른 적절한 임계치 설정이 불가능하다. 본 논문에서는 공유 메모리의 공정 할당이라는 단순한 기능을 가지는 동적 임계치 방식을 확장하여 구현이 용이하고 높은 메모리 이용률과 서비스 품질기능 측면에서 우선 순위에 따른 차등 적인 패킷처리 기능을 갖는 가중형 동적 임계치 방식을 제안하고 컴퓨터 시뮬레이션을 통하여 그 성능을 확인하였다.

• 국제물리치료학회지
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• 제11권2호
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• pp.2042-2051
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• 2020

Background: Many trials have been conducted the methods and types of intervention of form rollers, but no research has been done yet that mixes the methods and types of intervention. Objectives: To analyze the effects of myofascial release on the improvement of range of motion (ROM), flexibility, pain pressure threshold, and balance. Design: Randomized controlled trial. Methods: All subjects measured ROM, flexibility, pressure pain threshold, and dynamic balance by pre-test. After pre-test, subjects were randomized that static-vibration foam rolling group (n=12), dynamic-vibration foam rolling group (n=12), general foam rolling group (n=12). For the intervention, 3 sets of 90 seconds were applied to each group, and rest time was set to 60 seconds between sets. In the post-test and follow-up test after 10 minutes, all three groups were measured the ROM, flexibility, pressure pain threshold, and dynamic balance. Results: The results of comparing ROM, flexibility, pressure pain thresholds, dynamic balance ability appeared higher significant difference in the pre-post-10 minutes follow up test in comparison between time in the intragroup (P<.001). As a result of comparing the change of pre-post-10 minutes follow up, static vibration foam rolling showed higher significant difference compared to control groups (P<.001). Conclusion: Through this study, when foam rolling is applied within the same intervention time, static foam rolling can be expected to have a better effect than the existing dynamic foam rolling as well as vibration foam roller can expect better effect than general foam rolling.

• 대한기관식도과학회:학술대회논문집
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• 대한기관식도과학회 1978년도 제12차 학술대회연제 순서 및 초록
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• pp.8.3-8
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• 1978

부음기관의 기능이 정상인 경우 1,000Hz 이하의 저음역에서 골도관치는 외이도를 폐새 하였을 때와 개방하였을 때 약 20dB의 차이를 나타낸다. 그러나 외이도를 폐색하였을 때나 개방하였을 때 골도관치에 변화가 없으면 전음기관에 병변이 있음을 의미한다. 1891년에 Bing이 처음으로 외이도폐색에 의한 골도검사를 발표한 이래 여러 학자들에 의하여 본검사가 유용한 임상경력검사의 한방법으로서 인정되고Bing test로 알려지고 있다. Sullivan은 1947년에 250Hz, 500Hz, 1,000Hz에서 외이도를 폐색하였을 때와 개방하였을 때의 골도관치의 차이를 합한 것을 "Occlusion Index"라고 명명하였다. 이에 저자들은 bing test의 임상청각학적 의의를 검토하고자 정상인 40이, 만성중이염환자 20이, 감각신경성난청환자 14이를 대상으로 순음청력검사, Bing test및 impedance audiometry를 시행하고 occlusion index와의 상관관계를 검토하여 다음과같은 결과를 얻었다. 1. Occlusion index는 정상인 40좌에서는 $33.10\pm1.68dB,$ 만성중이염환자 20이에서는 $3.10\pm0.69dB,$ 감각신경성난청환자 14이에서는 28.10=4.05 dB이었다. 2. 정상인 40이의 static compliance는 범위가 0.22~0.75cc, 평균치가 0.64cc, 5.D가 0.05이었다. 3. Static compliance가 작을수록 occlusion index는 컸고, static compliance가 클수록 occlusion index 는 작아지는 영향을 나타내고 있음을 관찰하였다.

• 대한물리치료과학회지
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• 제31권2호
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• pp.63-74
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• 2024

Background: This study aimed to determine the effects of static stretching on the pain and range of motion (ROM) of shoulder joints in middle aged women patients with frozen shoulders. Design: One group pretest-posttest design Methods: The participants were 15 middle aged women patients with frozen shoulders in their 40s to 60s. Subjective and objective pain and joint ROM(range of motion) were measured, and the static stretching intervention consisted of 15 minutes of flexion, abduction and external rotation stretching. Results: The results of this study indicated that the daily pain of shoulder joints and pressure pain thresholds of the muscles surrounding the shoulder joints were generally improved after the intervention with the static stretching, for which significant differences were observed (p<0.05). The ROM of shoulder joint flexion, abduction, and external rotation was significantly increased (p<0.05) after the intervention with the static stretching. Conclusion: Static stretching intervention in patients with frozen shoulders relieved shoulder joint pain and had positive effects on the ROM of shoulder joints. Thus, the application of static stretching in middle aged womenpatients who experience severe pain could be effective at enhancing the function of shoulder joints without pain.

• Earthquakes and Structures
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• 제10권3호
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• pp.629-643
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• 2016

Among all the natural disasters, earthquakes are the most destructive calamities since they cause a plenty of injuries and economic losses leaving behind a series of signs of panic. The present study highlights the moment-curvature relationships for the structural elements such as beam and column elements and Non-Linear Static Pushover Analysis of RC frame structures since it is a very simplified procedure of non-linear static analysis. The highly popular model namely Mander's model and Kent and Park model are considered and then, seismic risk evaluation of RC building has been conducted using SAP 2000 version 17 treating uncertainty in strength as a parameter. From the obtained capacity and demand curves, the performance level of the structure has been defined. The seismic fragility curves were developed for the variations in the material strength and damage state threshold are calculated. Also the comparison of experimental and analytical results has been conducted.

• Smart Structures and Systems
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• 제21권5호
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• pp.695-703
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• 2018

Based on monitoring data collected from the Nanjing Dashengguan Bridge over the last five years, this paper systematically investigates the effects of temperature field and train loadings on the structural responses of this long-span high-speed railway bridge, and establishes the early warning thresholds for various structural responses. Then, some lessons drawn from the structural health monitoring system of this bridge are summarized. The main context includes: (1) Polynomial regression models are established for monitoring temperature effects on modal frequencies of the main girder and hangers, longitudinal displacements of the bearings, and static strains of the truss members; (2) The correlation between structural vibration accelerations and train speeds is investigated, focusing on the resonance characteristics of the bridge at the specific train speeds; (3) With regard to various static and dynamic responses of the bridge, early warning thresholds are established by using mean control chart analysis and probabilistic analysis; (4) Two lessons are drawn from the experiences in the bridge operation, which involves the lacks of the health monitoring for telescopic devices on the beam-end and bolt fractures in key members of the main truss.

• The Journal of Korean Physical Therapy
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• 제34권6호
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• pp.321-325
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• 2022

Purpose: Temporomandibular disorder (TMD) is a condition defined as pain and dysfunction of temporomandibular joints and masticatory muscles. Abnormal interconnections between temporomandibular muscles and cervical spine structures can cause the changes of postural alignment and balance ability. The aim of this study was to investigate changes in static balance ability in subjects with painrelated TMD. Methods: This study conducted on 25 subjects with TMD and 25 control subjects with no TMD. Pressure pain thresholds (PPTs) of the masseter and temporalis muscles were measured using a pressure algometer. Static balance ability was assessed during one leg standing using an Inertial Measurement Unit (IMU) sensor. During balance task, the IMU sensors measured motion and transfer movement data for center of mass (COM) motion, ankle sway and hip sway. Results: PPTs of masseter and temporalis muscles were significantly lower in the TMD group than in the control group (p<0.05). One leg standing, hip sway, and COM sway results were significantly greater in the TMD group (p<0.05), but ankle sways were not different between group. Conclusion: We suggest pain-related TMD is positively related to reduced PPTs of masticatory muscles and to static balance ability. These results should be considered together with global body posture when evaluating or treating pain-related TMD.

• Earthquakes and Structures
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• 제26권5호
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• pp.327-336
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• 2024

Evaluation of tunnel performance in seismic-prone areas demands efficient means of estimating performance at different hazard levels. The present study introduces an innovative push-over analysis approach which employs the standard earthquake spectrum to simulate the performance of a tunnel. The numerical simulation has taken into account the lining and surrounding rock to calculate the rock-tunnel interaction subjected to a static push-over displacement regime. Elastic perfectly plastic models for the lining and hardening strain rock medium were used to portray the development of plastic hinges, nonlinear deformation, and performance of the tunnel structure. Separately using a computational algorithm, the non-linear response spectrum was approximated from the average shear strain of the rock model. A NATM tunnel in Turkey was chosen for parametric study. A seismic performance curve and two performance thresholds are introduced that are based on the proposed nonlinear seismic static loading approach and the formation of plastic hinges. The tunnel model was also subjected to a harmonic excitation with a smooth response spectrum and different amplitudes in the fully-dynamic phase to assess the accuracy of the approach. The parametric study investigated the effects of the lining stiffness and capacity and soil stiffness on the seismic performance of the tunnel.

• 인터넷정보학회논문지
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• 제14권5호
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• pp.39-48
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• 2013

정의된 SLA의 QoS를 지키기 위해서, 클라우드 시스템은 동적인 사용 패턴에서 발생하는 변화무쌍한 작업 부하를 처리해야 한다. 서비스 관점이외에도 에너지 소비를 최소화 하는 것이 또한 새로운 관심사이다. 이는 클라우드 데이타 센터에서 가상화된 자원을 할당할 때 클라우드 제공자들은 에너지와 성능의 상관관계를 고려해야 한다. 본 논문에서는 호스트 컴퓨터의 작업부하 수준을 탐지하기 위해 동적 임계치를 기반으로 한 자원 프로비저닝 방안을 제시한다. VM선정 정책은 이주할 VM을 선택하기 위해 활용 데이터를 사용하며, VM 할당 정책은 서비스 평판도에 따라 VM들을 호스트에 지정한다. 시뮬레이션을 통해 연구결과를 평가하였으며, 시뮬레이션 결과 이주를 지원하지 않는 비 전력 방법뿐만 아니라 동적 임계치, 임의 선정 정책보다 성능이 우수함을 보였다.

• Physical Therapy Rehabilitation Science
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• 제8권4호
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• pp.210-217
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• 2019

Objective: This study was conducted to compare the immediate effect of hamstring stretching techniques of static stretching, proprioceptive neuromuscular facilitation (PNF) hold-relax and PNF irradiation on the hamstring muscle. Design: Three-group pretest-posttest design. Methods: Fifty-one subjects with shortened hamstrings were randomly assigned to the static stretching group (n=17), PNF hold-relax group (n=17), and the PNF irradiation group (n=17). All subjects performed an active knee extension (AKE) test to assess for the lower extremity with a shortened hamstring. The static stretching group performed stretches by lifting their leg to the maximum extent (3 times, 30 seconds). The PNF hold-relax group performed maximal isometric contraction against the experimenter's resistance (3 times, 10 seconds). The PNF irradiation group performed maximum isometric contraction against the experimenter's resistance toward the direction of the body (5 times, 5 seconds). The pre and post-tests measured range of motion (ROM), pressure pain thresholds (PPT) and muscle tone. Results: There were significant differences in ROM and PPT between pre and post intervention in each group (p<0.05). There was a significant difference only in the ROM among groups (p<0.05). Post-hoc analysis showed that the changes in ROM occurred in the order of the PNF hold-relax group, static stretching group and PNF irradiation group (p<0.05). Conclusions: The findings of this study suggest that the PNF irradiation technique may improve ROM and may be used to improve ROM similar to other stretching techniques. Therefore, the PNF irradiation technique could be included in stretching programs and can be used as a suitable stretching method depending on the situation.