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Insulation Coating of Fe–Si–Cr Soft Magnetic Powder by Selective Oxidation
Jae‑Young Park,Kwangsuk Park,Bosung Seo,Julien O. Fadonougbo,Tae‑Wook Na,Ki Beom Park,Hyeon‑Tae Im,Nong‑Moon Hwang,Hyung‑Ki Park 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7
This study examines the insulation coating technology of Fe–Si–Cr powder via selective oxidation annealing, which oxidizeselements selectively by controlling the oxidation potential. The study calculated the oxidation driving force of Fe, Si, andCr, and conducted a thermodynamic analysis of oxidation and reduction conditions according to temperature and oxidationpotential. Based on the results, a selective oxidation annealing was performed in an atmosphere in which Fe is reduced andonly Si and Cr are selectively oxidized. The oxidation potential was controlled through the partial pressure ratio of hydrogenand water vapor. The XPS analysis results confirmed that a Si and Cr complex oxide layer formed on the powder surfaceafter the selective oxidation annealing. Afterward, withstanding voltages were analyzed to evaluate the insulation property. Then, the withstanding voltage of the powder applying the selective oxidation annealing increased significantly comparedto that of the initial powder. Further analysis showed that the powder annealed in an air atmosphere had a significantly lowersaturation magnetic flux density than the initial powder, while the powder applying the selective oxidation annealing hadonly a slightly reduced saturation magnetic flux density.
Trigger point를 利用한 口眼괘斜 患者 10例에 대한 臨床的 考察
鄭榮敦,李浚龜,金永一,朴泰均,辛泳一,黃載然,李賢,李秉烈 대전대학교 한의학연구소 2002 한의학연구소 논문집 Vol.10 No.2
From July 1th 2001 to October 31th 2001, the Clinical investigation studies were carried out 10 cases of patient with Bell's palsy using Trigger point treatment group, who had been treated in Han-seung Oriental Medical Clinic. The results were like below : 1. The distribution of sex : Male were 4cases, female were 6case and the female to male ratio was 1.5 : 1. 2. The distribution of contributing factor : Unknown reason was most predominant 4 cases, and then were revealed to labor too hard, menttal stress(3 cases), trauma·common cold(1 case) in turn. 3. The distribution of perid to fall ill : Under a week was the most number 6cases, and then were revealed a week under two weeks(3 cases), over two weeks(1 case) in turn. 4. About period of treatment : The Trigger point treatment group is shorter than the Acupuncture treatment group. 5. The distribution of grade on admission in descending order : GrⅠ was the most number and then GrⅡ, GrⅢ in turn. 6. The distribution of clinical symptoms on adimission : Mastoid pain was the most number 9 cases and then lacrimal gland disorder 8 cases, dysgeusia 4 cases, hyperacusis 2 cases, the others 2 cases in turn. 7. About effect of treatment : The Trigger point treatment group is more excellent than the Acupuncture treatment group. 8. The more patient age is young, the more effect of treatment was excellent, had nothing to do with both groups. 9. The more perid to fall ill is short, the more effect of treatment was excellent, had nothing to do with both groups. 10. About period of improved frontal belly : The Trigger point treatment group is more excellent than the Acupuncture treatment group.
서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.
김재홍,김한중,노영석,김영태,김중환,황규홍,이정덕,백승철,김건우,조상현,김준영,김석민,김영호,김상순,이승한,김방순,전덕규,하상근 대한화학요법학회 1992 대한화학요법학회지 Vol.10 No.2
The prevalence of PPNG among pretreated gonorrhoeae cases isolates at the VD clinic of Choong-ku Public Health Center in Seoul has been studied and reported annually since 1981. In 1990, 162 strains of N.gonorrhoeae were isolated, among which 80 were PPNG. The prevalence of PPNG in Seoul showed increased tendency till 1987, thereafter, it has been stationary.
야뇨증 환아들의 심리사회적 특성에 대한 다기관 연구 : 행동 및 정서 문제를 중심으로
조수철,김재원,신민섭,황준원,한상원,박관현,이상돈,김경도,김건석,서홍진,이유식,정재용,김영균,문두건,남궁미경,한창희,조원열,김영식,배기수,이종국,정우영,신의진 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.6
Objectives : The aim of this study was to examine the behavioral and emotional problems associated with nocturnal enuresis in Korean children. Methods : Three hundred eighteen children with nocturnal enuresis, together with their parents, completed the Child Behavior Checklist (CBCL), Disruptive Behavior Disorder Scale according to DSM-IV (DBDS), Children's Depression Inventory (CDI), State-Trait Anxiety Inventory for Children (STAIC), and Piers-Harris Children's Self-Concept Scale (PHCSC). Ninety-three normal students were selected as the control group. Results : Compared to the normal control group, the mean scores with regard to the withdrawn, social problems, attention problems, delinquent behavior, aggressive behavior, externalizing problems and total problems profiles were significantly higher in the nocturnal enuresis group according to the CBCL results. The nocturnal enuresis group also scored significantly higher in the ADHD and ODD profiles of the DBDS. The nocturnal enuresis group was more depressed and anxious than the control group according to the results of the CDI and STAI. The mean score of the PHCSC was significantly lower in the nocturnal enuresis group when compared to the normal control group. Conclusion : The results of this study suggest that children with nocturnal enuresis in Korea have clinically relevant behavioral and emotional problems. The findings support the link between nocturnal enuresis and psychopathology in Korean children.
분광광도법에 의한 3-Chloro 및 3-Bromopyridine의 해리상수 측정과 그의 온도와 압력에 따른 영향
黃正儀,鄭倧在,尹永炷,金學成 慶北大學校 1984 論文集 Vol.38 No.-
Pyridine and most of substituted pyridines react as base in aqueous solutions. Strength of their basicities can be represented quantitatively by the dissociation constant of a base or its conjugated acid. The dissociation constants of weak acid or base are highly dependent on the pressure and the temperature. The dissociation constants of these substituted pyridines have been reported only under the pressure of atmosphere but not high pressure. In this study, we measured the dissociation constants of 3-chloro and 3-bromopyridine under high pressure by the method of spectrophotometry. Also, we obtained the thermodynamic parameters on the dissociation reactions that show the effects of the temperature and the pressure on the dissociation constants.
황재중,이철우,김영남,심재기,양인영 朝鮮大學校 機械技術硏究所 2003 機械技術硏究 Vol.6 No.1
본 연구에서는 CFRP 복합재 적층쉘 형상의 구조부재 설계 시 고려해야 할 고강성, 고강도 측면을 중점으로 2개의 계면수를 갖는 직교이방성 CFRP 복합재 적층쉘에 대하여 횡방향 하중 정적실험 및 ANSYS를 이용한 유한요소해석을 행하여 직교이방성 적층쉘의 역학적 특성을 실험 및 유한해석을 통하여 고찰하고자 한다. 또한, 곡률의 크기에 따른 CFRP 적층쉘의 충격특성을 정량적으로 평가하기 위하여 충격속도의 크기에 따른 에너지 흡수특성 및 충격손상기구를 규명하고자 한다. 정적실험의 경우보다 FEM해석의 경우가 약 25%∼35% 정도 높게 나타났고 충격에너지가 증가할수록 박리현상은 선형적으로 증가하였으며, 같은 충격에너지 범위라 할지라도 곡률 반경이 증가할수록 흡수에너지는 증가하였다. Centering on high rigidity and intensity 'to be considered in the design of sub-materials of the perpendicular anisotropic CFRP composite material laminate shells with two interlaminar number, this study performed width-direction load static experiments and the finite element method using the ANSYS to examine dynamic properties of perpendicular anisotropic laminate shells. Also, to evaluate the impact property of the CFRP laminate shell according to size of curvature quantitatively, it was to identify energy absorption and impact damage instruments according to size of impact speed. Absorption energy of the .FEM analysis was about 25-35% higher than that of the static experiment and the more impact energy increased, the more damage area increased linearly. Despite of the same impact energy range, the more curvature radius increased, the mere absorption energy.