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The Relation Between Local Hysteresis Losses and Remanent Magnetic Fields in HTSC Films
Muyong Kim,Heeyeon Park,Chan Kim,Sang-Kook Park,Ri, H.-C Institute of Electrical and Electronics Engineers 2017 IEEE transactions on applied superconductivity Vol.27 No.4
<P>Various critical state models have been developed to understand the hysteresis loss mechanism of high-temperature superconducting (HTSC) films. The analytic relation between the hysteresis loss and the remanent field was obtained based on Bean's critical state model for thin films in the full-penetration case. Furthermore, numerical calculation of local hysteresis loops was carried out by Kim's critical state model. In this paper, we investigated local hysteresis losses for a GdBCO coated conductor by using low-temperature scanning Hall probe microscopy and reproduced the experimental results by applying the critical state model. Because of the demagnetizing effect in thin films, analysis of local hysteresis losses can be useful approach to understand of total hysteresis losses.</P>
[PE-0031] Single Cross Corn Hybrid ‘Jindaok’with Lodging Tolerance and High Yield
MoonJong Kim(MoonJong Kim),JaeKeun Choi(JaeKeun Choi),HeeYeon Kim(HeeYeon Kim),JeongHeon Han(JeongHeon Han),Wang Seung Hyun(Wang Seung Hyun),WooSik Yong(WooSik Yong),JaeNam Shim(JaeNam Shim),SeungHun 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
Heeyeon Kim(김희연),Woongshik Nam(남웅식),Seong Hee Kim(김성희),Hye Ryang Jang(장혜량),Mi Kyoung Lee(이미경),Tae Wan Kim(김태완),Sangkyu Lee(이상규) 한국생명과학회 2012 생명과학회지 Vol.22 No.8
인삼 및 인삼 유래 물질들은 가장 대표적인 건강기능식품이며, 홍삼추출물(Panax ginseng C.A. Meyer)의 경우 항바이러스, 알레르기 감소, 항산화, 비만억제 등의 효과를 나타낸다고 알려져 있다. 대표적 건강기능식품임에도 불구하고 약물상호작용을 일으키는 대사효소(Cytochrome P450, CYP)에 대한 홍삼추출물의 영향은 보고되지 않았다. 본 연구에서는 사람의 간 마이크로좀 분획과 마우스 모델을 기반으로 홍삼엑기스의 약물대사 조절능을 평가하였다. 사람의 간 마이크로좀에서는 CYP2B6에 대한 미약한 억제 효과를 나타내었을 뿐, 타 대사효소 CYP1A2, 2B6, 2C19, 2D6와 3A에 대한 억제효과는 검출되지 않았다. 홍삼엑기스를 마우스에 50, 250, or 500m g/kg의 농도로 3, 7, 14일간 하루 1회 경구 투여 후 간을 적출하여 대사효소의 활성 변화를 측정하였지만, 유의적인 변화는 관찰되지 않았다. 결과적으로 홍삼엑기스의 유의적인 약물대사효소에 대한 활성 조절능이 없는 것으로 판단되고, 홍삼엑기스 복용에 따른 홍삼-약물상호작용의 가능성은 없을 것으로 추정된다. Ginseng is one of the most commonly used herbal medicines and health foods. Korean red ginseng (KRG; Panax ginseng C.A. Meyer) extract is known to have potential therapeutic activities, such as anti-viral effects, the amelioration of food allergies, anti-oxidant effects, and obesity reduction. Nevertheless, no reports have been issued the modulatory effects of KRG extract on the activity of cytochrome P450 (CYP). In the present study, we investigated the modulatory effect of KRG extract in vitro and in vivo by using pooled human liver microsomes and male ICR mice. When human liver microsomes were incubated with KRG extract at 0.01-10 mg/ml, CYP1A2, 2B6, 2C19, 2D6, and 3A were not significantly inhibited by KRG extract, although CYP2B6 was slightly inhibited. Mice were orally administered KRG extract at 50, 250, or 500 mg/kg daily for 3, 7, or 14 days. However, the activities of CYPs in mouse livers were not significantly different from those of vehicle-treated controls. In conclusion, no significant ginseng-drug interaction was observed. KRG extract did not significantly modulate the activities of CYPs in vitro or in vivo.
Resilient High Catalytic Performance of Platinum Nanocatalysts with Porous Graphene Envelope
Kim, Heeyeon,Robertson, Alex W.,Kim, Sang Ouk,Kim, Jong Min,Warner, Jamie H. American Chemical Society 2015 ACS NANO Vol.9 No.6
<P>Despite the innumerable developments of nanosized and well dispersed noble metal catalysts, the degradation of metal nanoparticle catalysts has proven to be a significant obstacle for the commercialization of the hydrogen fuel cell. Here, the formation of Pt nanoparticle catalysts with a porous graphene envelope has been achieved using a single step low temperature vaporization process. While these Pt–Gr core–shell nanoparticles possess superior resilience to degradation, it comes at the cost of degraded overall catalyst efficacy. However, it is possible to combat this lower overall performance through inclusion of low concentrations of nitrogen precursor in the initial stage of single-step synthesis, inhibiting the formation of complete graphene shells, as verified by atomic resolution aberration-corrected transmission electron microscopy (AC-TEM) imaging. The resultant porous graphene encapsulated Pt catalysts are found to have both the high peak performance of the bare Pt nanoparticle catalysts and the increased resilience of the fully shielded Pt–Gr core–shells, with the optimal N-doped Pt–Gr yielding a peak efficiency of 87% compared to bare Pt, and maintaining 90% of its catalytic activity after extended potential cycling. The nitrogen treated Pt–Gr core–shells thus act as an effective substitute catalyst for conventional bare Pt nanoparticles, maintaining their catalytic performance over prolonged use.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-6/acsnano.5b00678/production/images/medium/nn-2015-00678j_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b00678'>ACS Electronic Supporting Info</A></P>
Diagnostic imaging of malignant insulinoma in a dog
Choi, Jihye,Keh, Seoyeon,Kim, Sungsoo,Lee, Su-Hyung,Kim, Hyejin,Choi, Heeyeon,Lim, Younji,Kim, Hyunwook,Kim, Ahyoung,Kim, Dae-Yong The Korean Society of Veterinary Science 2012 大韓獸醫學會誌 Vol.52 No.3
Endocrine test data from a 13-year old intact female Maltese was indicative of the presence of an insulinoma, however ultrasonography identified a pancreatic mass only after 10 months after the first admission. Following identification of both pancreatic tumor and hepatic metastasis on computed tomography (CT), surgical excision of the mass was attempted. However, total excision failed because of tumor adhesion to adjacent large vessels. The pancreatic mass was monitored over the next 25 months via ultrasonography, CT, and positron emission tomography-computed tomography (PET-CT). Histopathological and immunohistochemical data confirmed the diagnosis of insulinoma with hepatic metastasis.
소아 신장이식 환자에서 발생한 파르보바이러스 B19에 의한 심한 빈혈에 대한 증례 보고 및 문헌 고찰
Kim Kyung-Ran,Park Hwanhee,Kim Doo Ri,Cho Heeyeon,Lee Sanghoon,Lee Suk-Koo,Kim Yae-Jean 대한소아감염학회 2021 Pediatric Infection and Vaccine Vol.28 No.3
Anemia commonly occurs in kidney transplantation (KT) recipients. Many factors such as viral infection, bleeding, erythropoietin deficiency, and immunosuppressants are the causes of chronic anemia in KT recipients. We report 2 cases who developed severe anemia caused by parvovirus B19 infection and were successfully treated with intravenous immunoglobulin in pediatric KT recipients. 신장이식 환자에서 만성 빈혈은 치료 과정 중 발생하는 합병증으로 바이러스 감염, 적혈구형성호르몬결핍, 출혈, 면역억제제의 부작용 등과 관련이 있다. 신장이식 환자에서 파르보바이러스 B19에 의한 빈혈은 초감염 혹은 기존 감염의 재활성화로 발생할 수 있으며, 아직 이에 대한 치료법은 정립이 되어 있지 않다. 특히, 소아청소년 신장이식 환자에 대한 보고나 자료는 더욱 드물다. 저자들은 소아청소년 신장이식 환자에서 발생한 심각한 빈혈을 파르보바이러스 B19 PCR 검사법으로 진단하고, 정맥내글로불린으로 재발 없이 성공적으로 치료한 두 증례와 문헌 고찰을 보고하는 바이다.