Improvement of Thermoplastic Forming Ability of Ti–Zr–Ni–Cu Metallic Glass by Addition of Sn

Yeong‑Seong Kim,Woo‑Chul Kim,Won‑Tae Kim,Do‑Hyang Kim 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6

Ti–Zr–Ni–Cu metallic glass attracts an attention as a precursor of superelastic alloy that can be deformed into nm scalecomplex shapes. However, since the thermal stability of Ti–Zr–Ni–Cu metallic glass in the supercooled liquid region is quitelow, application of thermoplastic forming is limited. Therefore, in the present study, the effect of Sn addition on thermoplasticforming ability of Ti–Zr–Ni–Cu metallic glass has been investigated. Sn containing (Ti35Zr15Ni35Cu15)99Sn1 metallic glassexhibits longer incubation time before onset of crystallization than Ti35Zr15Ni35Cu15metallic glass, resulting in significantimprovement of thermoplastic forming ability. The crystallization behavior changes from three-dimensional growth of saturatednuclei to three-dimensional growth with constant nucleation rate with the addition of Sn. The overall activation energyfor crystallization of (Ti35Zr15Ni35Cu15)99Sn1 metallic glass is higher than that of Ti35Zr15Ni35Cu15metallic glass, indicatingthat the thermal stability of metallic glass is improved by addition of Sn. Because nuclei are continuously generated duringthe crystallization in (Ti35Zr15Ni35Cu15)99Sn1, the average grain size is much smaller than that in Ti35Zr15Ni35Cu15.

Rifampicin에 의한 것으로 추정되는 위막성 대장염1예

김수현,이은우,정종혁,문승현,김동한,양혁승,오영상,김호동,김도현,박혁,박정환,박경옥,이영직 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2

Pseudomembranous colitis, caused by altering the normal colonic flora and allowing the multiplication of Clostridium difficile, is an deleterious adverse effect of antibiotics. But it is rarely reported by rifampicin. Rifampicin is one of the first line drug in the treatment of tuberculosis and many patients are exposed to its potential adverse effects. We experienced a patient that had abdominal discomfort and hematochezia due to pseudomembranous colitis after receiving antituberculous medication, and which was probably caused by rifampicin. A 82 years old man was admitted with abdominal discomfort and hematochezia for one week. On the past history he had been diagnosed as endobronchial tuberculosis about 4 months ago. Colonoscopy revealed multiple discrete whitish mucosal lesion on rectosigmoid colon, and histologic findings were consistent with pseudomembranous colitis. The antituberculous agents were discontinued and vancomycin was administered. The patient's symptoms were resolved within several days. There was no recurrence after reinstitution of the antituberculous agents excluding rifampicin. We report here on a case of pseudomembranous colitis probably due to rifampicin.

알루미늄 합금과 고장력 강판 접합을 위한 헬리컬 SPR의 단조공정 설계

김원영, 김동범, 김기호, 김도훈, 이인환, 조해용 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.2

A self-piercing rivet(SPR) is a mechanical component for joining dissimilar materials. It is used for joining dissimilar material sheets such as aluminum alloy and steel. The self-piercing rivet directly pierces into sheets without drilling sheets beforehand unlike conventional rivets. However, the self-piercing rivet occurs buckling when piercing high strength steel. Therefore, a helical SPR which can pierce high strength steel sheet was designed. In this study, forging process was designed for manufacturing the helical SPR and simulated by using commercial FEM code DEFORM-3D. In the simulation of forging process for manufacturing rivet, process sequence, formability, forging load were investigated. The suitable forging process could be designed by comparisons of simulated results. Experimental trials have been carried out for same conditions as simulated ones. The simulated results agreed with the experimental ones. So, the analytic approach in this thesis is useful to save cost and time in the forging industry

부사관 후보 대학생들의 학년과 성별 자가건강관리행태, 신체적 자기효능감 및 영양섭취상태에 관한 연구

김동두,김도연,백영호 釜山大學校 附設 體育科學硏究所 2014 體育科學硏究所 論文集 Vol.31 No.-

For the study on the type of self-care status, physical self-efficacy and nutritional status according to grade level and gender of cadet noncommissioned officer on college students(n=249). This study took a Chi-square to compare the type of self-care status according to grade level and gender of cadet NCOs students and physical self-efficacy, nutritional status data were analyzed by independent t-test, and the alpha level of p<0.5 was set for all tests of significance. The results of this study are as follows: Most of the students carry out this exercise, and regularly carried out by both health-training. The students showed irregular breakfast, and the preferred food of animal meat. Smoking rate is the male students 52.1%, female students 15.9%, 40.2% of the total smoking and drinking rate is the 81.1% of the total student showed that the drinking. The physical self-efficacy in significantly difference grade 2 male students was higher than that in grade 1 male students. Nutritional status of all students not enough even of fiber daily intake, and grade 2 male students was significantly lower than that in grade 1 students. Therefore, the desirable health care and diet to increase physical self-efficacy should improve the quality of life. 본 연구는 D대학 부사관 후보생들의 학년 및 성별 자가건강관리행태, 신체적 자기효능감 및 영양섭취상태를 비교 분석 하였다. 자가건강관리행태 중 운동여부는 1학년이 83.1%, 2학년이 73.7%, 남학생은 85%, 여학생은 68.3%로 실시하는 것으로 나타났으며, 운동을 실시하는 이유는 1학년 운동자체가 좋아서 36.7%, 2학년 체력증진을 위해서 62.9%, 남·여학생 모두 체력증진을 위해서 실시하는 것으로 나타났고, 규칙적으로 실시하는 운동은 두 학년 모두 헬스를 가장 많이 하는 것으로 나타났다. 아침식사는 모두 불규칙적으로 식사를 하는 것으로 나타났고, 동물성 육류를 선호하였다. 흡연율은 남학생 52.1%, 여학생 15.9%로 전체 40.2%로 나타났고, 음주율은 전체 학생의 81.1%가 음주를 하는 것으로 나타났다. 신체적 자기효능감은 남학생의 경우 2학년이 1학년보다 유의하게 높게 나타났다. 영양섭취상태는 남, 여학생 모두 섬유질 섭취량이 1일 충분섭취량에 못 미치는 것으로 나타났으며, 특히 2학년 남학생이 1학년 남학생보다 유의하게 낮게(p<.05) 나타났다. 이상의 결과 바람직한 자가건강관리행태와 식습관을 통해 신체적 자기효능감을 높이고 삶의 질을 향상 시켜야 할 것이다.

연령과 청력역치에 따른 청각장애아동의 음운적 특성

서영란,김진숙,고도흥 한국음성과학회 2001 음성과학 Vol.8 No.2

This research with 40 hearing impaired children was performed to find out the characteristics of the phonological processes for each age, hearing loss degree and aided threshold degree through the transcriptions. The phonological processes. of hearing impaired children are similar to those of normal children with a peculiar type of patterns in phonological processes. The results show that: (1) Between 5 and 6 year old groups the phonological processes were significantly different in palatal backing, glottal replacement and frication; between 6 and 7 year old groups the phonological processes were significantly different in velar fronting, labialization, alveolization and labial assimilation; between 7 and 8 year old groups the phonological processes, labialization, alveolization and alveolar assimilation, however 8 year old group showed more phonological processes than 7 year old group. (2) Between moderately-severe and severe hearing impaired groups, phonological processes were significantly different in the omissions of postvocalic, nasal and velar, stopping and stop assimilation. The differences of severe and profound groups were not found at all. (3) Aided hearing thresholds did not show any significant difference.

방사선 센서의 동작특성

임영화,한상효,김도성,강희동 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1

A Geiger-M□ller(GM) radiation sensor is fabricated by using the vacuum system and gas feeding system. The base pressure of the vacuum system is 1X10^(-7)torr, and two MFCs(0~10sccm, ±1% accuracy of the full scale) are used to control the composition of filling gas exactly. The fabricated GM radiation sensor is simultaneously filled with the mixture of neon and clorine. The mica window(7.43mg/cm^(2)) is attached to the GM radiation sensor. The optimized GM radiation sensor has about 660V starting voltage, 125V plateua length, and 10%/100V plateau slope.

전신성 홍반성 루프스에서 고용량 경정맥 당질코르티이드로 치료된 단백질 소실성 장질환 1예

이규형,권창모,김현도,윤대영,이재웅,홍여훈,이충기 영남대학교 의과대학 2005 Yeungnam University Journal of Medicine Vol.22 No.2

Generalizes edema and hypoalbuminemia are relatively common presenting manifestations in many clinical situations. The differential diagnosis of hypoalbuminemia include; Kwashiorkor, synthetic dysfunction of the liver, and excessive protein loss as in nephrotic syndrome. In systemic lupus erythematosus (SLE), hypoalbuminemia and generalized edema are most commonly due to protein loss associated with lupus nephritis; gastrointestinal involvement is uncommon, and therefore protein loss through the gastrointestinal tract is quite rare. We report a case of a protein losing enteropathy (PLE) associated with SLE. The patient was referred to out hospital for generalized edema, arthralgia and facial rash. After clinical evaluation, the patient met the criteria for the SLE diagnosis; hypoalbuminemia with general edema was consistent with a protein losing enteropathy. After two weeks of therapy with parenteral high dose glucocorticoid, the patients was improved in laboratory findings as well as clinical symptoms.

형광유도체화제로 Bansyl-Cl을 이용한 Dopamine, Norepinephrin의 HPLC분석법에 관한 연구

이윤중,이강민,김영도 成均館大學校 科學技術硏究所 1992 論文集 Vol.42 No.2

A rapid and high sensitive HPLC method for the determination of dopamine and norepinephrine is described. 5 -Dibutyl-aminonaphthalene-1-sulfonyl chloride (bans yl-Cl) was used as a pre-column fluorescent derivatizing reagent for HPLC determination of the two compounds. The optimal conditions for the derivatization of dopamine and norepinephrine with bansyl-Cl such as pH, reaction time, reaction temperature, and the amount of bansyl-Cl were described. The structures of bansyl derivatives were identified by Infrared and ^1H-NMR spectroscopy. The bansyl derivatives were separated on Radialpak^TM NH_2 column using the mixture of cyclohexane and ethyl acetate as the mobile phase and monitored by fluorescence detector. Linearity of calibration curve was obtained and the detection limits in a 5 μl injection volume were 2.5ng/ml, respectively.

[PF-0040] Identification of QTL Linked to Stone Cell Content in ‘Whangkeumbae’ (Pyrus pyrifolia) × ‘Minibae’ ((P. pyrifolia × P. ussuriensis) × P. pyrifolia)

Do Yeong Kim(Do Yeong Kim ),Sewon Oh(Sewon Oh ),Yumi Kim(Yumi Kim ),Yunju Hwang(Yunju Hwang ),Daeil Kim(Daeil Kim ) 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-

Development of HRM Marker Related to Stone Cell Content in Pear (Pyrus spp.)

Do Yeong Kim,Sewon Oh,Yumi Kim,Yunju Hwang,Haewon Jung,Keumsun Kim,Daeil Kim 한국원예학회 2023 한국원예학회 학술발표요지 Vol.2023 No.5