• Proceedings of the Korean Society of Plant Pathology Conference
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• 2002.11a
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• pp.96-97
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• 2002

• Journal of Astronomy and Space Sciences
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• v.29 no.2
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• pp.195-198
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• 2012

The dual channel Pierce-Blitzstein photometer (PBPHOT) was productively used at the Flower and Cook Observatory to provide 60 years of study of binary systems and other cosmic objects. We review the history of this instrument, discuss its calibration, and recall some personal and professional interactions with Professor Robert H. Koch.

• 대학교육
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• s.147
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• pp.114-116
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• 2007

중앙대학교(총장 박범훈)는 글로벌인적자원개발대학원(원장 이희수)의 주관으로 2007년 5월 3일 아트센터 9층 멀티미디어세미나실에서 교육인적자원부 수도권대학 특성화 지원사업의 일환으로'글로벌시대의 전략적 인적자원개발'이라는 주제의 국제학술세미나를 개최하였다. 이날 세미나에는 미국 교육학회장을 역임한 세계적 석학인 The Pennsylvania State University의 Kyle Peck 교수 등을 비롯하여 교육인적자원부, 한국직업능력개발원, 중앙대학교, PSI 컨설팅 등 관.산.학.연의 핵심 인사가 참여하였다. 다음은 기조연설 및 주제발표의 내용을 정리한 것이다.

• 한국전기화학회:학술대회논문집
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• 2004.06a
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• pp.229-232
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• 2004

• International Journal of Air-Conditioning and Refrigeration
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• v.13 no.4
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• pp.184-195
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• 2005

This paper describes the recent work on advanced technology concepts applied to air cooled heat exchangers for residential air-conditioning. The concepts include vortex generators for the air-side, micro-fin or flat tubes for the refrigerant-side. Advances in understanding of heat transfer mechanisms, predictive models are discussed.

• Journal of the Korean Ceramic Society
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• v.42 no.5 s.276
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• pp.308-313
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• 2005

In this study the electrical conductivity of excess BaO in $BaTiO_3$ was measured to investigate the relationship between defects and solubility in the temperature range of $900^{\circ}C$ to $1300^{\circ}C$ under various oxygen partial pressure. First of all, quenched $BaTiO_3$ powders of various Ba/Ti ratios were analysed by X-ray diffraction to confirm whether second phase is formed or not. As the results, we observed the solubility of BaO in the temperature range of $1200^{\circ}C$ to $1400^{\circ}C$, and it was also found that the conductivity minima move to lower $PO_2$ with increasing excess BaO within solubility limit.

• Biomaterials and Biomechanics in Bioengineering
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• v.3 no.3
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• pp.129-140
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• 2016

This article reports the development of biodegradable photoluminescent polymer (BPLP)-based nanoparticles (NPs) incorporating either magnetic nanoparticles (BPLP-MNPs) or gadopentate dimeglumine (BPLP-Gd NPs), for cancer diagnosis and treatment. The aim of the study is to compare these nanoparticles in terms of their surface properties, fluorescence intensities, MR imaging capabilities, and in vitro characteristics to choose the most promising dual-imaging nanoprobe. Results indicate that BPLP-MNPs and BPLP-Gd NPs had a size of $195{\pm}43nm$ and $161{\pm}55nm$, respectively and showed good stability in DI water and 10% serum for 5 days. BPLP-Gd NPs showed similar fluorescence as the original BPLP materials under UV light, whereas BPLP-MNPs showed comparatively less fluorescence. VSM and MRI confirmed that the NPs retained their magnetic properties following encapsulation within BPLP. Further, in vitro studies using HPV-7 immortalized prostate epithelial cells and human dermal fibroblasts (HDFs) showed > 70% cell viability up to $100{\mu}g/ml$ NP concentration. Dose-dependent uptake of both types of NPs by PC3 and LNCaP prostate cancer cells was also observed. Thus, our results indicate that BPLP-Gd NPs would be more appropriate for use as a dual-imaging probe as the contrast agent does not mask the fluorescence of the polymer. Future studies would involve in vivo imaging following administration of BPLP-Gd NPs for biomedical applications including cancer detection.

• Journal of The Korean Society of Agricultural Engineers
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• v.58 no.1
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• pp.81-90
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• 2016

The Agricultural Systems Application Platform (ASAP) provides bottom-up modelling and simulation environment for agricultural engineer. The purpose of this study is to expand usability of the ASAP to the second order partial differential equations: elliptic equations, parabolic equations, and hyperbolic equations. The ASAP is a general-purpose simulation tool which express natural phenomenon with capsulized independent components to simplify implementation and maintenance. To use the ASAP in continuous problems, it is necessary to solve partial differential equations. This study shows usage of the ASAP in elliptic problem, parabolic problem, and hyperbolic problem, and solves of static heat problem, heat transfer problem, and wave problem as examples. The example problems are solved with the ASAP and Finite Difference method (FDM) for verification. The ASAP shows identical results to FDM. These applications are useful to simulate the engineering problem including equilibrium, diffusion and wave problem.

• Anxiety and mood
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• v.11 no.1
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• pp.47-53
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• 2015

Objective : Generalized anxiety disorder (GAD) is a common anxiety disorder characterized by excessive worries and anxiety symptoms. To distinguish between pathological and normal worries, this study compared the contents and severity of worries among patients with GAD with those of matched non-psychiatric control Methods : Thirty outpatients with GAD receiving treatment at the psychiatric department of Hanyang University Guri Hospital were recruited. As a matched control group, we selected 30 adults without psychiatric history who participated in the Anxiety Disorder Survey, during the Mental Health Exposition held in Seoul in April, 2014. Matched demographic data were age, sex, education, and household income. Self-questionnaires included demographic data, contents of worry (10 categories of worries and each severity), and the Pennsylvania State Worry Questionnaire (PSWQ). Results : There was no statistical difference in the contents of worry between patient and control groups. However, the total PSWQ scores significantly higher in the GAD group. Conclusion : Our findings suggest that patients and non-patients worry about the similar contents and worries in GAD cannot be differentiated by what people worry about. Only the severity of worry was a distinguishable feature. Our finding supported inclusion of the diagnostic criterion of "excesslve wornes" in GAD.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.04b
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• pp.165-170
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• 2004

MLCC의 주재료인 $BaTiO_3$는 금속전극의 산화를 방지하기 위해 환원분위기에서 소결하는데 이는 비화학양론적 조성 및 전기적 성질, 결함 그리고 상의 변화를 가져온다. 본 연구에서는 상의 변화를 다양한 온도 범위에서 BaO 또는 $TiO_2$를 첨가시킨 $BaTiO_3$ powder을 가지고 급냉시킨 후 이를 X-선 회절 분석을 통하여 이들의 이차상 형성 여부 등을 조사하였다. $1320^{\circ}C$에서는 $TiO_2$의 고용도가 BaO의 고용도에 비해 상당히 큰 값을 가짐을 알 수 있었다. 이런 결과를 바탕으로 Ba/Ti 비, 산소분압 및 온도에 따른 $BaTiO_3$의 전기전도도 거동에 의하면, 고용범위내에서 BaO 첨가량이 증가할수록 전기전도도의 최소점은 낮은 산소분압쪽으로 이동함을 관찰하였으며 이는 $Ti^{4+}$빈자리에 따른 산소빈자리가 형성되는 결함 모델로 설명되어진다.