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RISS 인기검색어
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- 저자 : Junhyuk Hyun (검색결과 28 건)
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현준혁(Hyun Junhyuk) 한국디자인사학회 2023 Extra Archive: 디자인사연구 Vol.- No.7
The ISBN is a crucial element for efficient management and distribution of books in commercial publishing. However, why is an ISBN a mandatory requirement for the “Beautiful Book” contest? Even when considering the efficiency of the contest system and its process, this question remains. Does the absence of an ISBN mean a book cannot be considered beautiful in Korea? What significance does a book hold outside the realm of the book production and distribution ecosystem? This project of archiving ISBNs and barcodes raises questions about the ISBN numerical system and the publishing ecosystem encapsulated in the vertical lines of the barcode. Through the process of collecting and archiving ISBNs and barcodes, this project questions the contradictions within the publishing ecosystem, beyond the formality of the ISBN and its series of information. It delves into the ultimate questions about independent publishing-what does it truly mean to be independent, and where does this genuine autonomy stem from?
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Complications of hook plating in shoulder trauma: What is most common complication?
Yoonsuk Hyun,Junhyuk Jang,Donghyun Kim,Byeol Ma 대한견주관절의학회 2021 대한견주관절학회 학술대회논문집 Vol.2021 No.3
Introduction and Background To investigate the complications and their frequency of hook plate use in shoulder trauma. Material and Method We reviewed 216 cases with hook plate at our hospital from January 2010 to May 2020. Patients who have arthroscopic surgery at the same time, scapular fracture on the same shoulder, short follow-up period less than 3 months after plate removal, were excluded. 76 cases of distal clavicle fracture and 84 cases of acromioclavicular joint dislocation were included. We investigated all complications after hook plating, the bony union in fracture, and reduction loss in dislocation. Results Painful Stiffness (forward elevation(FE) <135°) were notified in 37 cases of fracture (48.7%) and 34 cases of dislocation(40.5%). 10 cases of stiffness was responded with intra-articular or subacromial steroid injection, and 61 cases of stiffness was improved with additional manipulation (20 cases in fracture +28 cases in dislocation) or arthroscopic capsular release (ACR, 7 cases in fracture + 6 cases in dislocation) during plate removal. Acromial osteolysis has occurred in all patients with varying degrees and acromial fracture was occurred 2 cases in fracture +7 cases in dislocation. 5 cases (6.6%) of nonunion and 1 case of incomplete union and 1 case of periprosthetic stress fracture in fracture group. 3 cases of reduction loss after plate removal in dislocation group. But any patient with reduction loss or nonunion or acromial fracture did not complain pain or tenderness on joint during the follow-up period. Pain on abduction was notified 17 of 76 cases (22.4%) in fracture and 13 of 84 cases (15.5%) in dislocation, but there is no iatrogenic rotator cuff injury which was verified through MRI in cases who show continued shoulder pain or impingement or need manipulation. Conclusions In surgical treatment with hook plate, most common complication was painful stiffness. Stiffness could be improved with manipulation or ACR during plate removal.
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Proposing a GPU based Modified Fuzzy Nearest Neighbor Rule for Traffic Sign Detection
Peyman Hosseinzadeh Kassani,Junhyuk Hyun,Euntai Kim 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
The purpose of this study is introducing a graphical process unit (GPU) implementation of a modified fuzzy nearest neighbor rule useful for traffic sign detection (TSD). The new method tries to detect road signs using color information in order to locate regions of interest. The candidate regions of interest are obtained by color information. Afterward, candidate regions are used for making histogram of oriented gradient (HOG) feature. Finally, the features are fed into the GPU-based modified fuzzy nearest neighbor in order to detect traffic signs. The proposed rule modifies the way for fuzzification of query sample in terms of distances while the conventional fuzzy nearest neighbor (FNN) doesn’t care distance of local neighbors. The accuracy of the proposed method is compared with the state of the arts k-nearest neighbor (k-NN), FNN and support vector machine algorithms on the challenging German traffic sign detection benchmark (GTSDB) data set. Results indicate that the modified rule achieves good accuracy and is competitive compared to others.
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Daehyeon Park,Yunju Lee,Junhyuk Ham,Seung Chang Yoo,Kiyoung Kim,Donghee Lee,Ji Hyun Kim 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
In Korea, borated stainless steel (BSS) is used as a storage rack in spent fuel pools (SFP) to maintain the nuclear criticality of spent fuels. As the number of nuclear power plants and the corresponding amount of spent fuels increased, the density in SFP storage rack also increased. In this regard, maintaining subcriticality of spent nuclear fuels became an issue and BSS was selected as the structural material and neutron absorber for high density storage rack. Since it is difficult to replace the storage rack, corrosion resistance and neutron absorbency are required for long period. BSS is based on stainless steel 304 and is specified in the ASTM A887-89 standard depending on the boron concentration from 304B (0.20-0.29% B) to 304B7 (1.75-2.25% B). Due to the low solubility of boron in austenitic stainless steel, metallic borides such as (Fe, Cr) 2B are formed as a secondary phase. Metallic borides could cause Cr depletion near it, which could decrease the corrosion resistance of the material. In this paper, the long-term corrosion behavior of BSS and its oxide microstructures are investigated through accelerated corrosion experiment in simulated SFP conditions. Because the corrosion rate of austenitic stainless steel is known to be dependent on the Arrhenius equation, a function of temperature, the corrosion experiment is conducted by increasing the experimental temperature. Detail microstructural analysis is conducted using a scanning electron microscope, transmission electron microscope and energy dispersive spectrometer. After oxidation, a hematite structure oxide film is formed, and pitting corrosion occurs on the surface of specimens. Most of the pitting corrosion is found at the substrate surface because the corrosion resistance of the substrate, which has low Cr content, is relatively low. Also, the oxidation reaction of B in the secondary phase has the lowest Gibbs free energy compared to other elements. Furthermore, oxidation of Cr has low Gibbs free energy, which means that oxidation of B and Cr could be faster than other elements. Thus, the long-term corrosion might affect the boron content and the neutron absorption ability of the material. Using boron’s high cross-section for neutrons, the neutron absorption performance of BSS was evaluated through neutron transmission tests. The effect of the corrosion behavior of BSS on its neutron absorption performance was investigated. Samples simulated to undergo up to 60 years of degradation before corrosion through accelerated corrosion testing did not show significant changes in the neutron shielding ability before and after corrosion. This can be explained in relation to the corrosion behavior of BSS. Boron was only leached out from the secondary phase exposed on the surface, and this oxidized secondary phase corresponds to about 0.17% of the volume of the total secondary phase. This can be seen as a very small proportion compared to the total boron content and is not expected to have a significant impact on neutron absorption performance.
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Daehyeon Park,Yunju Lee,Junhyuk Ham,Seung Chang Yoo,Kiyoung Kim,Donghee Lee,Yongdeog Kim,Ji Hyun Kim 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
In Korea, borated stainless steel (BSS) is used as spent fuel pool (SFP) storage rack to maintain nuclear criticality of spent fuels. As number of nuclear power plants and corresponding number of spent fuels increased, density in SFP storage rack also increased. In this regard, maintain subcriticality of spent nuclear fuels was raised as an issue and BSS was selected as structural material and neutron absorber for high density storage rack. Because it is difficult to replace storage rack, corrosion resistance and neutron absorbency are required for long period. BSS is based on stainless steel 304 and it is specified in the ASTM A887-89 standard depending on the boron concentration from 304B (0.20-0.29% B) to 304B7 (1.75-2.25% B). Due to low solubility of boron in austenitic stainless steel, metallic borides such as (Fe, Cr)2B are formed as secondary phase metallic borides could make Cr depletion near it which could decrease the corrosion resistance of material. In this paper, long-term corrosion behavior of BSS and its oxide microstructures are investigated through accelerated corrosion experiment in simulated SFP condition. Because corrosion rate of austenitic stainless steel is known to be dependent on the Arrhenius equation, a function of temperature, corrosion experiment is conducted by increasing the experimental temperature. Detail microstructural analysis was conducted with scanning electron microscope, transmission electron microscope and energy dispersive spectrometer. After oxidation, hematite structure oxide film is formed and pitting corrosions occur on the surface of specimens. Most of pitting corrosions are found at the substrate surface because corrosion resistance of substrate, which has low Cr content, is relatively low. Also, oxidation reaction of B in the secondary phase has the lowest Gibbs free energy compared to other elements. Furthermore, oxidation of Cr has low Gibbs free energy which means that oxidation of B and Cr could be faster than other elements. Thus, the long-term corrosion might affect to boron content and the neutron absorption ability of the material.
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