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폐나일론을 이용한 섬유보강 아스팔트 콘크리트의 피로특성 및 경제성 분석
Ingyu Baek,Kisun Park,Nakseok Kim 한국재난정보학회 2013 한국재난정보학회 논문집 Vol.9 No.4
본 연구는 자동차 파쇄 잔재물의 활용성을 알아보고자 폐차과정에서 발생되는 폐나일론 섬유를 아스팔트 콘크리트에 첨가하여 일반 아스팔트 콘크리트와의 피로수명 비교, 경제성 분석을 실시하였다. 4점 휨 피로 시험을 수행한 결과 일반 아스팔트 대비 피로수명이 10% 향상되었으며, 이를 통해 경제성 분석을 실시하여 35년간 약 5.4억 원의 유지보수비용에 대한 비용 절감을 가져 오는 것으로 확인 되었다. 폐나일론 섬유 보강 아스팔트는 비용절감 효과와 더불어 폐자재의 환경처리비용 이점과 활용성 측면에서의 친환경적 공법으로 생애주기비용분석에서보다 더 큰 경제적, 사회적 효과가 발생 할 것으로 판단된다.
An Improved Stereo Matching Algorithm with Robustness to Noise Based on Adaptive Support Weight
( Ingyu Lee ),( Byungin Moon ) 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.2
An active research area in computer vision, stereo matching is aimed at obtaining three-dimensional (3D) information from a stereo image pair captured by a stereo camera. To extract accurate 3D information, a number of studies have examined stereo matching algorithms that employ adaptive support weight. Among them, the adaptive census transform (ACT) algorithm has yielded a relatively strong matching capability. The drawbacks of the ACT, however, are that it produces low matching accuracy at the border of an object and is vulnerable to noise. To mitigate these drawbacks, this paper proposes and analyzes the features of an improved stereo matching algorithm that not only enhances matching accuracy but also is also robust to noise. The proposed algorithm, based on the ACT, adopts the truncated absolute difference and the multiple sparse windows method. The experimental results show that compared to the ACT, the proposed algorithm reduces the average error rate of depth maps on Middlebury dataset images by as much as 2% and that is has a strong robustness to noise.
Drug-induced Hyperprolactinemia Results in Atypical Atypical Fracture
( Ingyu Lee ),( Dong-wook Son ),( Jun Hyoung Park ),( Jai Hyung Park ) 대한고관절학회 2021 Hip and Pelvis Vol.33 No.2
We report a case of bilateral femur fracture which may have resulted in part from long-term administration of antipsychotic agents. A 43-year-old female patient with pain in both thighs visited our clinic. We conducted X-ray and magnetic resonance imaging (MRI) examinations which revealed bilateral femur fractures. The right proximal femur had a complete fracture, and the left proximal femur had an incomplete fracture, both of which were in the subtrochanteric area. The patient was treated by intramedullary nailing in the right femur. Laboratory analysis showed hyperprolactinemia and hypogonadism. Bone mineral density analysis showed osteoporosis. Antipsychotic drug-induced hyperprolactinemia is a well-known phenomenon. Despite concerns about hyperprolactinemia induced osteoporotic fracture in patients treated with only prolactin-elevating medications, the issue has not been extensively studied. If hyperprolactinemia patients suffer from uncontrolled pain, we recommend MRI examination as surgeons should be aware of the possibility of osteoporotic fracture induced by hyperprolactinemia.
Ingyu Oh,장원호,임현진 서울대학교 사회발전연구소 2023 Journal of Asian Sociology Vol.52 No.4
This article presents an in-depth explanation of the most common denominator of Hallyu (Korean Wave) fans not only in Japan, the largest Hallyu market in the world, but in other parts of the world as well. We introduce a concept of “female universalism, which is associated with three factors of gendered, racial, and postcolonial melancholia, in order to explain the global boom of the new postcolonial pop genre known as Hallyu. Defined as a female-dominated pop culture through alternative media outlets as social media and streaming apps, such as YouTube, Spotify, and Netflix, we focus on the alternative message Hallyu presents to its fans as opposed to those found in mainstream pop culture created by the Anglo-American and Hollywood pop culture industries. The alternative message is the affective attraction, which is created by Hallyu artists and then conveyed to female Hallyu fans. It is a diverse message about individual dreams, female success, finding pure love with male partners, social justice, and many others. Nonetheless, we find these messages are united under the banner of female universalism that ultimately alleviates gendered melancholia and empowers them to join the creative aspect of their fandom, including cover dancing, studying Korean language and culture, and participating in ambitious social projects that would transform the world into a more female friendly place.
Ingyu Lee,Jungsoo Yoon,Gujeong Park,Youngbin Yoon 한국항공우주학회 2014 International Journal of Aeronautical and Space Sc Vol.15 No.4
A throttleable rocket engine enables operational possibilities such as the docking of spacecraft, maneuvering in a certain orbit and landing on a planet’s surface, altitude control, and entrance to atmosphere-less planets. Thus, throttling methods have long been researched. However, dual-manifold injectors, which represent one throttling method, have been investigated less than others. In this study, dual-manifold and single-manifold injectors were compared to determine the characteristics of dual manifold injectors. Also, the effects of gas injection were investigated with various F/O ratios. To investigate the characteristics, mass flow rate, spray pattern, spray angle, and droplet size were measured. The spray angle and droplet size were captured by indirect photography. About 30 images were taken to assess the spray patterns and spray angle. Also, 700 images were analyzed to understand the droplet distribution and targeting area, moving to the right from the centerline with 1.11-㎝ intervals. The droplet size was obtained from an image processing procedure. From the results, the spray angle showed two transition regions, due to swirl momentum in the swirl chamber regardless of the F/O ratio. The droplet size showed similar trends in both dual-manifold and single-manifold injectors except in the low mass flow rate region. In the case of the dual- manifold injector, the spray cone was not fully developed in the low mass flow rate region due to low angular momentum in the swirl chamber.