• Journal of the Korean Magnetics Society
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• v.6 no.2
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• pp.98-105
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• 1996

스퍼터링 방법으로 제작된 NiFe 박막에서 Ar 압력이 자기 및 자기저항 성질에 미치는 여향을 조사하였다. 타겟으로는 Ni$_{81}$$Fe_{19}$ 조성의 합금타겟을 사용하였다. TEM을 써서 박막의 미세구조를 조사하였으며, 보자력과 포화자화는 VSM으로 측정하였다. 합금박막의 조성은 ICPS로 분석 확인하였다. 10 mTorr 이상의 높은 Ar 압력에서 제작된 박막에서 갈라진 틈새(crack-like void)를 갖는 주상구조가 관찰되었다. 이러한 주상 결정립경계(columnar grain boundary)가 자화 과정에서 자구벽 핀닝자리(pinning site)가 되어, Ar 압력이 커짐에 따라 보자력이 증가 하였으며, 박막의 밀도가 감소하여 포화자화가 줄어드는 것을 볼 수 있었다. 한편, Ar 압력이 증가하면서 자기저항비가 감소하는 결과를 얻었다. 결정립 경계 산란과 결정립간 터널링에 의한 박막의 비저항의 증가가 이러한 자기저항비 감소의 주원인임을 알 수 있었다.다.

• Proceedings of the KSEEG Conference
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• 2007.04a
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• pp.428-430
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• 2007

• Journal of Korean Academy of Fundamentals of Nursing
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• v.15 no.2
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• pp.134-142
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• 2008

Purpose: This study was done to identify satisfaction with the method of evaluating practical skills in fundamental nursing through cellular phone animation self-monitoring and feedback. Method: The participants were 163 first-year student nurses. Data were collected from October 1 to 5 2007 using a structured questionnaire. Results: The average score for satisfaction was 3.65(${\pm}.69$) and the highest score was for the item, "I was pleased to have the opportunity of relearning by looking back at my behaviors through self monitoring" with 4.05(${\pm}.89$). The average score for dissatisfaction was 3.23(${\pm}.90$) and the highest score was "I memorized only orders according to the checklist" with 3.65(${\pm}.97$). The practical tests method showed a significant difference according to motivation for application to college of nursing (F=3.11, p=.047). There was a significant positive correlation between practical education satisfaction and test method (r=.363, p=.000). Conclusion: These findings show that there is a need to develop strategies to improve practical test methods for student nurses.

• Journal of the Korean Magnetics Society
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• v.6 no.2
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• pp.112-116
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• 1996

스퍼터링법으로 제조한 NiFeCo/Cu/NiFeCo/FeMn 스핀밸브 자성 다층막의 자기적 성질과 자기저항에 대해 연구하였다. Cu 사잇층 두께가 15 .angs. 인 경우 약 6%의 자기저항을 얻을 수 있었다. NiFeCo/FeMn에서 교환이방성 자계는 약 20 Oe 정도였는데, 이는 NiFe/FeMn 계 스핀밸브 구조에서 보고된 값(100 Oe 이상) 보다 현저히 작은 것이다. 3 mTorr에서 제조한 NiFeCo 박막은 약 10 Oe 정도의 큰 보자력을 보임으로써 비슷한 조건에서 제조한 NiFe 박막의 경우(약 2 Oe)보다 상당히 큰 값을 갖는 것으로 관찰되었다. 작은 교환이방성 자계와 큰 보자력으로 인해 음 .rarw. 양 방향과 양 .rarw. 음 방향의 자화거동에 있어서 비대칭적인 자기저항 이력곡선 거동을 보이는 것으로 나타났다.

• Journal of the Korean Vacuum Society
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• v.2 no.4
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• pp.433-438
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• 1993

전자의 파동성에 기인하는 여러 가지 양자간섭 현상을 연구하기 위하여, 금속의 미세고리구조을 제작하였다. 전자의 양자간섭과 가간섭 역충돌 효과에 의한 자기저항의 진동형상이 관측되었으며, 자기저항의 비주기 섭동 현상과 비국재현상도 관찰되어 중시적 전기 전도도의 일반식에 의하여 설명되었다. 또한 AlGaAs/GaAs 의 이차원 전자가스총을 이용한 고리구조도 제작되어, 양자 효과와 탄동적 수송의 영역에서 자기저항이 측정되었다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.258-259
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• 2005

현재 실온특대자기저항효과(室溫特大磁氣抵抗效果(CMR))재료에 관한 연구가 주목 받고 있다. 본 연구는 $LaSrMnO_3$ Magnetite에서 일부 La를 Nd로 치환(置換)한 결과, 사방정 구조를 갖는 실온 CMR 자기재료로써 현저한 CMR 효과가 있음을 확인하였고, 실온범위에서 실용적 응용가치가 있는 평탄한 MR-T 특성을 얻을 수 있음이 관찰되었다.

• Investigative Magnetic Resonance Imaging
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• v.12 no.2
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• pp.148-152
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• 2008

Purpose : To find the MR findings and evaluate the usefulness of MR in flexor hallucis longus(FHL) dysfunction. Materials and Methods : From 1992 to 2003, fourty patients were found to have surgically confirmed FHL dysfunction. 24 cases of 22 patients who had performed MR were included in this study. We analyzed the signal intensity of FHL tendon and muscle, tendon sheath, sheath effusion, and bone lesions, retrospectively. Results : Non-specific, increased sheath effusion of FHL tendon was seen in 12 cases (50%). Large amount of sheath effusion(grade 3) was observed in 5 cases (21%). The signal intensity of FHL tendon was normal in all cases. High signal intensity at the FHL muscle, proximal to musculotendinous junction was seen in 1 case (4%). One case (4%) of marrow edema of the talus and another one case (4%) of osteochondritis dissecans of the talus was seen. Conclusion : Non-specific, increased sheath effusion of FHL tendon was observed on MR in FHL dysfunction patients. Therefore, MR has a limited role in diagnosis of FHL dysfunction and is useful to exclude other bone and tendon diseases causing medial ankle pain.

• Journal of Yeungnam Medical Science
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• v.15 no.2
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• pp.306-315
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• 1998

MR findings in nine patients(three female, six male) with neuro-Behcet's disease were retrospectively analyzed. NeuroBehcet's disease was diagnosed on the basis of typical clinical symptoms. Involved site, pattern, signal intensity, and contrast enhancement pattern on MRI were evaluated. In addition, follow up MR imaging was performed in four patients. The midbrain(7/9), internal capsule(7/9), pons(6/9), thalamus(6/9), basal ganglia (5/9), middle cerebella peduncle(4/9), medulla oblongata(2/9), and subcortical white matter(2/9) are involved on MRI. The size of lesions was 1cm to 3cm and their margin was ill-defined and patchy. Inhomogeneous high signal intensity on the T2-weighted images and low signal intensity on T1-weighted images was seen respectively. In four of nine cases, there was focal enhancement. On follow up MR imaging, improvement or recurrance of the lesions was found. Also in two cases of follow up cases, there was artophy in brainstem and(or) middle cerebellar peduncles. In conclusion, MR imaging with systemic clinical symptoms is useful for diagnosing neuro-Behcet's disease.

• Journal of the Korean Magnetics Society
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• v.14 no.6
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• pp.224-227
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• 2004

We have studied local magnetization reversal by laser annealing in exchange biased NiFe/FeMn bilayer. Local magnetization reversal was performed by using the DPSS laser under external magnetic field of 600G. When the laser illuminated the patterned film with the power of above 300 mW during 15 min, a magnetoresistance (MR) curve with symmetric peaks at the opposite field was obtained due to the local reversal of exchange biasing. The direction of exchange anisotropy in the locally reversed region can be restored by local laser annealing under alternating magnetic field, even if its MR peak was reduced by the damage and interdiffusion. The magnetic domain structure of the locally reversed region was measured by MFM. The new domains were generated by laser annealing near the exposed area.

• Journal of Gifted/Talented Education
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• v.24 no.3
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• pp.445-462
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• 2014

The purpose of the present study is to compare paper and pencil test utilized to identify gifted students so far to the recently introduced teacher observation-recommendation system. More specifically, this study compared intelligence, career patterns, and self- regulated learning abilities of gifted students who were identified through those two different identification system to explore the possibility of the newly introduced teacher observation-recommendation system. The results show that there was no significant difference in the aspect of overall IQ score. However, students who were identified through the observation-recommendation system showed significantly higher scores at some subscores of intelligence test, such as vocabulary application, comprehension, and schematization. In the aspects of career patterns, about 72% of gifted students who were identified through the previous paper and pencil test belonged to the 'investigative' category of Holland. But more diverse career patterns such as enterprising, social, realistic, conventional including investigative categories were found in those students who were identified by the observation-recommendation system. There were also significant differences in the self-regulated learning abilities between two groups of students. Practical implications of the study were discussed in depth.