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주동범,안우환 한국교육학회 대구·경북지회 1999 교육학논총 Vol.19 No.2
Using 275 fifth and sixth graders, this study examines what are the factors in the teaching behavior of effective teacher, and if there is any difference between fifth and six graders and between males and females in the perception of effective teacher. The findings show that although the factors are not consistent with theoretical factors assumed by researchers, six factors(clarification, organization, diversification, motivation, behavior management, and learning management) are identified as teaching behaviors of effective teacher. The findings also show that fifth graders perceive organization, diversification, and learning management as teaching behaviors of effective teacher, and females perceive clarification, organization, diversification, motivation, and behavior management as teaching behaviors of effective teacher. Grade and gender differences in the perception of effective teacher, and six factors as teaching behaviors of effective teacher are discussed.
일항 이,Beom Hoan O,Jinan Xia,Seung Gol Lee 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
We report the results of our investigation on the near-field and far-field distribution of the optical emission on in the design optimization of a 4 $\times$ 4 InGaAs/GaAs vertical-cavity surface-emitting laser (VCSEL) array. We examined the effect of the refractive index variation and the inter-element spacing on the near-field and far-field distribution of the optical emission modes in positive-index-guided VCSEL arrays, using numerical simulation. Our results demonstrate that a strong transverse-mode overlapping with poor inter-modal discrimination occurs in the near-field emission pattern of a VCSEL array for a small index-step and a small inter-element separation shorter than one wavelength. However, the modal discrimination can be improved in an array for a large refractive index step even if the array has a small inter-element separation. In addition, a stronger near field and a higher optical power can be obtained from positive-index-guided VCSEL arrays having a larger index-step under the conditions of other parameters being equal.
Design of Nanoring Resonators Made of Metal-insulator-metal Nanostrip Waveguides
송준화,이현식,Beom-Hoan O,이승걸,박세근,이일항 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.61
We report on the design of nanoring resonators made of metal-insulator-metal (MIM) nanostrip waveguides. The characteristics of the lightwave propagation through the silver-based MIM plasmonic waveguides with an air superstrate are examined. The effective refractive indices, the propagation losses, the bending losses, and the beat lengths are analyzed by using 2D and 3D finite element methods (FEMs). For the optimization of the nanoring resonators, we examined the resonant mode power and the Q factor with respect to the width of the MIM nanostrip and the separation between the ring resonator and the straight waveguide. We obtained an optimized nanoring resonator that had submicron diameters (R = 399 nm) and 3rd-order resonances at a 1550-nm wavelength. These nanoring resonators will play an important role as the basic building blocks for the realization of nanoscale photonic integrated circuits.
Passivation Effect during the C4F8 + N2 Etch Process for SiOCH Low-k Films
Seung-Kook Yang,박세근,Beom-hoan O,El-Hang Lee,Han-Hyoung Kim,Han-Seok Yoo,이승걸,장성필,Jong-Geun Lee,Ho-Young Song 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.6
Plasma-induced damage to low-k dielectric layers is a key issue in developing multi-level interconnection technology based on copper and low-k dielectrics. Changes in the chemical composition of the dielectric films after plasma processes often increase the dielectric constants of low-k materials. In this work, SiOCH low-k dielectric films were studied and etched by using a C₄F8+N₂ plasma for patterning. Nitrided fluorocarbon polymer films were observed after C₄F8+N₂ plasma etching. X-ray photoelectron spectroscopy was used to monitor the chemical bonding changes of the polymer films in terms of N₂ content in the C₄F8+N₂ mixture. With 40 \% N₂ in the mixture, the etch condition was optimized for high etch rate and selectivity. After photoresist stripping by using a N₂ plasma and removal of nitrided fluorocarbon polymer by HF dipping, the SiOCH layer had recovered its original dielectric constant of 2.80 without any pattern size change.
A Case of Lyme Disease Complicated with Atrioventricular Block in a 13-year-old Boy
( Bin Ahn ),( Gi Beom Kim ),( Hoan Jong Lee ),( Eun Hwa Choi ) 대한소아감염학회 2020 Pediatric Infection and Vaccine Vol.27 No.3
라임병은 진드기를 매개로 하여 보렐리아속균 감염에 의해 발생하는 세균 질환이다. 가장 흔한 증상으로 초기에 유주성 홍반이 대부분의 환자에게서 관찰되며, 신경, 심혈관계 및 관절을 침범하는 증상이 발현할 수 있다. 저자들은 미국 코네티컷주로 여행력이 있는 13세 남자에게서 발현한 라임병을 진단하여 보고하는 바이다. 환자는 2016년 여름에 미국에서 숲 체험에 참여하던 중 발열, 두통, 양쪽 무릎 관절통을 호소하여 귀국하였으며, 내원 시 양 하지에 다수의 유주성 홍반이 관찰되었다. 심전도 검사에서 1도 방실 차단이 확인되었다. 간접면역형광항체법과 웨스턴블럿법 검사에서 라임병 특이 IgM 항체가 양성으로 확인되었다. 경구 doxycycline으로 4주간 치료하였으며, 유주성 홍반이 소실되고 심전도가 정상 소견으로 회복되었다. 라임병의 진단에 있어 호발 지역으로의 여행력을 확인하는 것이 중요하다. 라임병에 의한 심장염은 무증상 방실 전도차단으로 나타날 수 있고 고도 방실 차단으로 진행할 수 있어 주의를 요하며 적절한 항생제 치료를 통해 회복될 수 있다. Lyme disease is a common vector-borne disease caused by Borrelia burgdorferi. Erythema migrans represents the most common manifestation during the early phase of this disease; however, systemic manifestations involving the nervous system, joints, or heart are known to occur. We report a case of Lyme disease accompanied by cardiac complications in a 13-year-old Korean male adolescent. The patient developed annular erythematous lesions on his lower extremities after a field trip during his visit to Connecticut, USA, for a boarding school camp, and his skin lesions were consistent with erythema migrans. Indirect immunofluorescence assay and Western blot analysis for Lyme immunoglobulin M showed positive results. Electrocardiography revealed a first-degree atrioventricular block, and he was diagnosed with Lyme carditis and received a 4-week course of oral doxycycline. Follow-up electrocardiography performed a week later revealed normal findings, and the patient showed an uneventful recovery. Lyme carditis often presents as an asymptomatic heart block that can progress to an advanced heart block; however, this condition is reversible with appropriate antibiotic treatment.