• Journal of the Korean Society of Radiology
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• v.82 no.2
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• pp.469-474
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• 2021

Japanese encephalitis (JE) is a common infection caused by the Japanese encephalitis virus in Southeast Asia, which is transmitted to humans through Culex mosquitoes. Magnetic resonance imaging (MRI) is used to diagnose JE, which is often characterized by the presence of bilateral symmetric thalamic involvement. Here, we report a rare case of JE characterized by leptomeningeal enhancement without thalamic involvement. This leptomeningeal enhancement disappeared with the treatment; however, new non-specific multifocal and bilateral high signal intensities in the cerebral white matter were found on follow-up MRI.

• Journal of the Korean Society of Radiology
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• v.81 no.5
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• pp.1234-1238
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• 2020

Calcium pyrophosphate dihydrate (CPPD) crystal deposition disease is characterized by chondrocalcinosis, which mainly affects the knees, wrists, pelvis, and rarely, the spine. According to previous reports, CPPD crystal deposits display heterogeneous enhancement on MRI. When combined with inflammation of the surrounding soft tissue, strong enhancement by CPPD crystal deposition may appear similar to imaging features of other conditions such as infectious spondylitis. In these conditions, CT plays an important role in differential diagnosis. Here, we present a case of CPPD crystal deposition disease in the ligamentum flavum of the cervical spine that showed intense enhancement on MRI.

• Journal of the Korean Society of Radiology
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• v.81 no.6
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• pp.1472-1477
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• 2020

Dural arteriovenous fistula is an acquired vascular anomaly that can cause various symptoms. Here, we report a rare case of Borden type I sigmoid sinus dural arteriovenous fistula presenting as subarachnoid hemorrhage. Bleeding occurred from a side-wall aneurysm in the lateral pontomedullary segment of the anterior inferior cerebellar artery, which was a minor pial feeder. Features on imaging modalities, including brain CT, CT angiography, MR imaging/angiography and digital subtraction angiography, are described with a literature review.

• Journal of Korean Association for Spatial Structures
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• v.24 no.2
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• pp.65-73
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• 2024

In this study, we propose an optimal design method by applying the Prefabricated Buckling Restrained Brace (PF-BRB) to structures with asymmetrically rigidity plan. As a result of the PF-BRB optimal design of a structure with an asymmetrically rigidity plan, it can be seen that the reduction effect of dynamic response is greater in the case of arrangement considering the asymmetric distribution of stiffness (Asym) than in the case of arrangement in the form of a symmetric distribution (Sym), especially It was confirmed that at an eccentricity rate of 20%, the total amount of reinforced PF-BRBs was also small. As a result of analyzing the dynamic response characteristics according to the change in eccentricity of the asymmetrically rigidity plan, the distribution of the reinforced PF-BRB showed that the larger the eccentricity, the greater the amount of damper distribution around the eccentric position. Additionally, when comparing the analysis models with an eccentricity rate of 20% and an eccentricity rate of 12%, the response reduction ratio of the 20% eccentricity rate was found to be large.

• Journal of Society of Preventive Korean Medicine
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• v.28 no.1
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• pp.131-157
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• 2024

목적 : 본 연구는 감기에 대한 한약제제 임상시험을 수행하고 평가하는 데 보편적인 원칙을 제공하는 가이드라인 개발과정 및 내용을 소개하여 가이드라인 활용성 및 접근성을 높이고자 한다. 방법 : 임상시험 가이드라인 개발을 위해 총 9인으로 이루어진 위원회를 구성하고, 전반적인 절차를 수립하였다. 먼저, 가이드라인 집필위원회에서 관련된 국내외 가이드라인을 고찰하고, 감기에 대한 최신 임상시험 논문을 분석하여 초안을 완성하였다. 이후 대한한방내과학회 소속 전문가 자문위원회 검토 및 8인의 전문가로 구성된 협의회 자문을 통해 최종 가이드라인을 도출하였다. 결과 : 본 가이드라인은 (1) 일반적 사항 (2) 유효성 평가 기준 (3) 유효성 평가 방법 (4) 시험 대상자 선정 (5) 임상시험 설계 (6) 안전성 평가 (7) 감기 치료에서의 병용요법 (8) 한의학적 고려 사항의 8가지 범주로 나뉘어진다. 최종 개발된 가이드라인은 한의약임상시험센터 협의회와 대한한방내과학회의 인증을 득하였다. 결론 : 본 가이드라인은 감기 치료를 위한 임상시험을 수행하고 평가하는 데 유용하게 사용될 것이며, 이를 통해 신뢰할 수 있는 결과를 이끌어내고 정확한 해석을 용이하게 할 수 있을 것이라 기대된다. 또한 추후 해당 가이드라인 개정 및 관련된 호흡기질환 가이드라인 개발 과정에 도움을 줄 수 있을 것으로 사료된다.

• Journal of the Korea Society of Computer and Information
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• v.29 no.2
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• pp.169-177
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• 2024

The purpose of this paper is to explore the meaning of talent donations by semi-professional Athlete using Q methodology. This Q factor analysis finally identified 3 factors: The first factor, The type of donation cautious, They represent an understanding the need for donation, needing to prepare for donation, information about donation targets, careful attitude toward talent donation. The second factor, The type of donation authenticity, They represent departure from good mind, premise of authenticity to donation, necessity of program for donation activities. The final factor, The type of trust for endowment institution, They represent trust in the target organization to donate, interest in donation-related incidents, necessity of various donation methods in sports field.

• The Journal of the Acoustical Society of Korea
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• v.25 no.8
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• pp.389-394
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• 2006

Mid-Frequency bistatic reverberation level is modeled using ray theoretic algorithms. The algorithm assumes multiple forward/backward scatter along with reciprocity in the Propagation paths. The environments modeled are assumed to be range independent in bathymetry, bottom scattering and surface scattering. Mid-Frequency bistatic scattering algorithm is used as a scattering model. A comparison of predicted reverberation versus time with measured data is presented to verify the bistatic reverberation model. The result demonstrates that it is possible to obtain reasonable reverberation Predictions in experimental site.

• The Journal of the Acoustical Society of Korea
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• v.26 no.6
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• pp.227-234
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• 2007

This paper describes a transmission method based on a single carrier with frequency domain equalization (SC-FDE) scheme with cyclic prefix(CP). The SC-FDE has similar features with orthogonal frequency division multiplexing(OFDM). Similar to OFDM, a SC-FDE system is computationally efficient since equalization is reformed on a block of data in the frequency domain. Especially, it has the advantage of low sensitivity to nonlinear distortion compared to OFDM. In this paper, we design a SC-FDE receiver using decision-directed method, and present simulation results.

• The Journal of the Acoustical Society of Korea
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• v.29 no.5
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• pp.295-302
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• 2010

This paper proposes a multiple access method based on Time Reversal Mirror (TRM) technique when the multiple sensor nodes exist. Proposed method increases system sum capacity using energy focusing effects of the TRM. Simulation results show that proposed algorithm obtains higher system sum capacity than Orthogonal Frequency Division Multiple Access (OFDMA), e.g., 27 bps/Hz higher than the OFDMA method when the number of sensor node is 30, the number of transducer is 8, and is SINR 16 dB.

• The Journal of the Acoustical Society of Korea
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• v.28 no.8
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• pp.755-760
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• 2009

In this paper, we apply a reverberation suppression method using difference of singular values to improve the short-distance underwater obstacle detection probability in reverberation environment induced by a linear frequency modulation signal. The reverberation suppression method using difference of singular values suppresses LFM reverberation based on subtracting the singular values for a reference beam, assumed to contain only the reverberation, from those for the current beam of interest, assumed to contain the reverberation and target echo. For the validation, the reverberation suppression method using difference of singular values is applied to real oceanic data, which are acquired using the cross type array.