Conceptual Study for Tissue-Regenerative Biodegradable Magnesium Implant Integrated with Nitric Oxide-Releasing Nanofi bers

Jin‑Kyung Jeon,Hyunseon Seo,Jimin Park,Soo Ji Son,Yeong Rim Kim,Eun Shil Kim,Jong Woong Park,Woong‑Gyo Jung,Hojeong Jeon,Yu‑Chan Kim,Hyun‑Kwang Seok,Jae Ho Shin,Myoung‑Ryul Ok 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4

The excessive initial corrosion rate of Mg is a critical limitation in the clinical application of biodegradable Mg implantsbecause the device loses its fi xation strength before the fractured bone heals. This study suggests a new approach to overcomethis hurdle by accelerating tissue regeneration instead of delaying the implant biodegradation. As angiogenesis is anessential process in early bone regeneration, a Mg implant coated with electrospun nanofi bers containing nitric oxide (NO),which physiologically promotes angiogenesis, is designed. The integrated device enables adjustable amounts of NO to bestored on the NO donor-conjugated nanofi ber coating, stably delivered, and released to the fractured bone tissue near theimplanted sites. An in vitro corrosion test reveals no adverse eff ect of the released NO on the corrosion behavior of the Mgimplant. Simultaneously, the optimal concentration level of NO released from the implant signifi cantly enhances tube networkformation of human umbilical vein endothelial cells without any cytotoxicity problem. This indicates that angiogenesis canbe accelerated by combining NO-releasing nanofi bers with a Mg implant. With its proven feasibility, the proposed approachcould be a novel solution for the initial stability problem of biodegradable Mg implants, leading to successful bone fi xation.

Microwave Absorption Characteristics of U-Type Ferrite Powders According to Substitution Elements and Its Compositions

Kwang‑Pil Jeong,Su‑Won Yang,Jin‑Hyuk Choi,Jeong‑Gon Kim 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8

In this study, partially substituted U-type ferrite (Ba4MexCo2-xFe36O60, Me: Mn, Ni, Zn, x=0.5 and 1.0) powders weresynthesized by sol–gel method. The powders were analyzed for phase formation, morphology and magnetic properties byXRD, FE-SEM and VSM respectively. The synthesized ferrite powders were pressed into a series of toroidal shaped samples,in which the weight ratio of parafn to powder was 1:5. The complex scattering parameters were measured by using vectornetwork analyzer in the frequency range of 2–18 GHz and were employed in the calculation of refection loss with variousthicknesses. The minimum refection loss was observed in the substituted nickel sample as−24.4 dB (absorption rate 99.6%)with a thickness of 2.5 mm and the bandwidth was achieved 4.8 GHz (from 7.5 to 12.3 GHz) for refection loss≤ −10 dBin the substituted zinc sample.

통합체육수업이 장애대학생과 일반대학생의 태도에 미치는 영향

오광진 한국특수체육학회 2005 한국특수체육학회지 Vol.13 No.1

The purpose of this study was to identify the effects of inclusive physical education lessons on attitudes of college students with and without disabilities. Subjects for this study were college students with and without disabilities participating in inclusive physical education lessons in H college which was built for inclusion education. The samples included 197 college students (students with disabilities = 87, students without disabilities = 110). The questionnaire concerning attitudes toward inclusive physical education was developed by Oh Kwang-Jin (2001b) which consisted of 6 factors, 26-item, 5 of socio-demographics variables, and 6 of background variables. Independent t-test, Paired t-test, and One-way ANOVA were used for data analyses, and the reliability was confirmed by Cronbach's a value. Cronbach's a value was .88. The results were as follows: First, there was no significant difference in attitude toward inclusive physical education between college students with and without disabilities at pre (after 3-week) and post (after 15-week) test points, however there was a significant difference in attitude toward inclusive physical education within each college students with and without disabilities. Second, first and second semester college students didn't have significant difference in attitude toward inclusive physical education. Third, previous experiences in inclusive education lessons had significant difference on attitudes toward inclusive physical education. Four, previous experiences in inclusive physical education lessons had significant difference on attitudes toward inclusive physical education. Fifth, understanding of disability traits made a significant difference in attitudes toward inclusive physical education. These results implied attitudes toward inclusive physical education of college students with and without disabilities will be changed more positively, if they participated in inclusive physical education lessons systematically during 12 weeks.

FDM 장치에서 주사량과 시제품의 경사가 표면거칠기에 미치는 영향

권광진,전재억,정진서,김광희,하만경 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-

Competitive power is rapidly manufacture product required consumers. Therefore, modern industry have changed from small item many production to many item small production. rapid production is necessary thing at the product development. Thus, rapid prototyping is appeared. If the graphic model was made by CAD, the production can be made in short term. That provide what the part was directly tested by the worker. It provide believable data. This study is experiment on surface roughness of part at FDM

티부틸디메틸실릴옥시기를 포함하는 퓨록산 유도체의 합성에 관한 연구

黃匡鎭,金光鎭,金鎭國 홍익대학교 산업기술연구소 2000 産業技術 Vol.10 No.-

The furoxan 6 containing TBDMS group was prepared by the dimerization of the corresponding nitric oxide that was generated in situ from the N-hydroxy iminoyl chloride 5. The synthetic route for the furoxan containing TBDMS provides more efficient NMR spectroscopic analysis to that using THP as a hydroxyl protecting group. In addition to this,the yield in [3+2] cycloaddition of the corresponding nitric oxide for the furoxan 6 was higher (〉95%) than that in the reaction using THP protecting group. Those results suggest us thst TBDMS group is considered as better protecting group than THP for the synthesis of furoxan containing thiol group.

일반중학생의 통합체육에 대한 태도 연구

오광진,최승권,김기영 한국특수체육학회 2002 한국특수체육학회지 Vol.10 No.1

the purpose of this study was to examine the middle school students' attitude toward inclusive physical education of students with disabilities. Subjects for this study was middle school students of 7-9 grades living in Seoul, South Korea The sample number used in the analysis was 497. The questionnaire concerning the middle school students' attitudes toward inclusive physical education was developed by Kwang-Jin Oh(2001) who consisted of 6 factors, 26-item. The reliability of the questionnaire was confirmed based on the calculation of Chronbach's α value. Chronbach's α value was .8753. This study produced the following results. First, the middle school students' attitudes toward inclusive physical education of students with disabilities according to gender, grades, experience of inclusive education, having friends with disabilities, and experience of inclusive physical education had significant differences. Second, gender and start of inclusive physical education had negative effects on attitude toward inclusive physical education of students with disabilities. These findings reported the middle school students contacted with students with disabilities had negative attitudes toward inclusive physical education.

진해만 해성점토의 토질특성에 관한 연구

이광열,윤성현,홍진원,안용수 東西大學校 2001 동서논문집 Vol.7 No.-

This study presents the physical and mechanical characteristics of dredged clays from Jin-Hae costar area. Dredged clays generally used as a land reclamation materials for land use in the shoreline. Experimental studied were performed on the samples directly obtained from the field. The results of direct shear test, unconfined test and consolidation test were presented for variable water contents. From the study, it is indicated that the strength of soil is decreased as increase of water contents, and the strength is increased as time passing.

이병주의 <철학적 살인>에 나타난 사랑의 법적 한계

안광진 ( An Kwang-jin ) 순천대학교 인문학술원 2019 인문학술 Vol.3 No.-

Lee Byung-ju's short novel < Philosophy Murder > shows a direct subject of adultery, demonstrating the limitations and expansion of law and literature. The main character, Min Tae-gi, commits murder because he thinks Ko Kwang-shik, who was his rival in college, has an affair with his wife. And through the philosophical rationalization and agony of the main character, the author shows the problem of adultery, the responsibility of love, and the psychological state of the protagonist through the intense consciousness of the writer himself. If you interpret the correlation between the literature and the law that this novel shows, First, literature never solves human problems through law. It seeks freedom and salvation of human nature at a different level from the law. Second, literature, unlike legal punishment, also focuses on revealing the most human nature, as opposed to calling for human conviction and philosophy. They say that even a human being who is being punished and disciplined by the law, the literature does not going to accept the law. Third, literature, unlike legal punishment, also offers hope for the possibility of human salvation. Overall, the novel < Philosophical Murder > depicts the love, jealousy, and salvation of human beings in dramatic situations, as it is usually the case with Lee Byung-ju's works, with the intensity of psychological description. The true value of the story is that the protagonist's convincing murder is gradually undergoing a process of change touching the root of human nature and opening up the possibility of redemption. This novel, meanwhile, once again concisely illustrates the difference between literature and law.

고관절 전치환술 후 합병된 비구 컵 해리와 동반된 활액낭종 : 증례보고 Case Report

성일보,정국진,박수철,김진호,정형진,황재광,염재광,정병현,안종국 대한고관절학회 2001 Hip and Pelvis Vol.13 No.1

FDM에서 Build Orientation이 쾌속조형물의 표면에 미치는 영향

전재억,서진호,권광진,권혁준,정진서,하만경 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-

Fused deposition (FD) modeling by Stratasys Inc., is one of the material deposition subfamilies of solid freeform fabrication (SFF) technologies. In this process, build material in the form of a flexible filament, is heated to a semi-liquid state and extruded from a controlled deposition head onto a fixtureless table in a temperature controlled environment. The position of nozzle is computer controlled relative to the base, which allows geometric complex models to be made to precise dimensions. FDM provide what the part was directly tested by the worker. It provide believable data. This Study is identify to surface roughness by build orientation adjustment. So, the paper is the study on surface roughness by build orientation at FDM.