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RISS 인기검색어
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- 저자 : 방윤규 (검색결과 7 건)
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Mixed Wave Function for Heavy Fermion Compounds
방윤규 한국초전도학회 2010 Progress in superconductivity Vol.11 No.2
We propose a variational wave function for the ground state of the magnetic heavy fermion (HF) systems, in which both the Kondo and the RKKY interactions are variationally incorporated and the local f-orbital state exists as a linear combination of a full local moment state and a fully compensated state (mixed wave state). We describe the mechanism for the mixed wave ground state based on the large-N treatment of the Kondo lattice Hamiltonian added with RKKY interaction. With the mixed wave ground state we can explain several puzzling experiments in magnetic HF compounds such as a small value of local moment, coexistence of the antiferromagnetic (AFM) and the paramagnetic (PM) phases, local quantum criticality, etc.
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Revival of Phonons in high Tc superconductors
방윤규 한국초전도학회 2008 Progress in superconductivity Vol.9 No.2
We study the effects of phonon interaction on the superconducting pairing in the high Tc superconductors (HTSC). Using coupled BCS gap equations, we found that phonon interaction can induce a s-wave component to the d-wave gap, mediated by Antiferromagnetic (AFM) spin fluctuations, in the (D+iS) form. However, Tc is not enhanced compared to the pure d-wave pairing without phonon interaction. On the other hand, anisotropic phonon interaction d-wave pairing and Tc itself, together with the AFM spin fluctuation interaction. This (DAFM+ Dph) type pairing exhibits strongly reduced isotope coefficient despite the large enhancement of Tc by phonon interaction.
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Risk Factors for Functional Constipation in Young Children Attending Daycare Centers
박민규,방윤규,조기영 대한의학회 2016 Journal of Korean medical science Vol.31 No.8
Our objective was to determine the risk factors associated with the development of functional constipation (FC) in young children attending daycare centers. A cross-sectional survey using a questionnaire based on the Rome III criteria was conducted in children aged 25 to 84 months from 3 randomly selected daycare centers in January 2016. The items in a questionnaire were statistically compared in the constipated and non-constipated groups. A total of 212 children were included and FC was found in 8.5%. Multivariate logistic regression analyses revealed that maternal history of constipation (odds ratio [OR] = 4.1, 95% Confidence Interval [CI] 1.2-13.9), history of painful defecation before age 1 (OR = 10.4, 95% CI 1.1-101.3), history of painful defecation during toilet training (OR = 28.9, 95% CI 1.9-423.8), no or difficult defecation at a daycare center (OR = 5,804.6, 95% CI 134.4-250,718.4), no meat consumption (OR = 10.1, 95% CI 1.2-88.1), and 500 mL or less of water intake per day (OR = 9.9, 95% CI 0.9-99.5) were powerful predictors of FC in young children (P < 0.05). Additionally, the constipated group was significantly associated with 2 hours or less of outdoor play activities per day, entry into daycare centers before 24 months age, 6 hours or more of attendance at a daycare center per day, breastfeeding for less than 6 months, 3 meals or less per day, and 3 or fewer servings of fruits and vegetables per day (P < 0.05). The findings of this study can guide parents, daycare teachers, and clinicians in prevention, early recognition and early intervention for the risk factors associated with FC in young children.
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Sik Kyung Choi,방윤규,오현식,이진 대한소아감염학회 2018 Pediatric Infection and Vaccine Vol.25 No.3
방선균은 피부, 구강, 위장관 및 하부 여성 생식기에 정상균무리로 존재하며 증식속도가 느린 사상체의 형태를 한 혐기 그람 양성균이다. 방선균증은 방선균 감염에 의한 질환으로 대부분 경부 안면 감염증, 복부, 골반 감염증, 그리고 흉부 감염증의 임상 형태로 나타난다. 저자들은 급성 충수염으로 충수절제술을 받은 건강한 6세 남아에서 수술 후 조직검사에서 복부 방선균증을 진단하고 장기간 항생제 치료한 1예를 경험하고 보고하는 바이다. 복부 방선균증은 소아에서는 드문 질환이고 증상이 비특이적이며 균 동정을 위한 배양검사가 까다로운 점이 있어 초기 진단이 잘 되지 않고 주로 임상 검체에서 특징적인 조직소견으로 진단되는 경우가 많다. 이를 통해 방선균의 특징을 이해하고 복통을 주소로 내원한 환자에서 정상균무리가 체내로 침입할 수 있는 선행 요인 등을 가진 경우 감별진단에 복부 방선균증도 염두에 두는 것이 바람직하겠다. Actinomyces are anaerobic, Gram-positive bacteria that are part of the endogenous flora of mucous membranes in humans. Infection caused by these bacteria is termed actinomycosis. The 3 most common types of actinomycosis are cervicofacial, abdominopelvic, and pulmonary. A previously healthy 6-year-old boy presented with the emergency room with fever, vomiting, and abdominal pain and initially diagnosed with acute appendicitis. Exploratory laparoscopy was done. Histologic finding demonstrated acute gangrenous appendicitis complicated by perforation and sulfur granules compatible with actinomycosis. Subsequently, he was diagnosed with abdominal actinomycosis and received long-term antibiotic therapy. Abdominal actinomycosis is uncommon in children and difficult to diagnose because of its nonspecific symptoms and of difficulties in growing Actinomyces in the clinical setting. It is necessary to include abdominal actinomycosis as a differential diagnosis of children presenting with abdominal pain.
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