불완전 비루관 폐쇄에서 시행한 Byon의 검사

변도석 ( Do Seok Byon ),조정곤 ( Jung Gon Cho ),조선재 ( Seon Jae Cho ) 대한안과학회 2002 대한안과학회지 Vol.43 No.2

약분리성 검정을 통한 한국육류의 AIDS체계 분석

김병호,어영준 建國大學校 自然科學硏究所 1995 建國自然科學硏究誌 Vol.6 No.-

The relevant restrictions for the separability test at the mean value were employed as following: γ??(β? + α?) - γ??(β? + α?) + (α?β? - α?β?)α? = 0 The null hypothesis that meat commodities are separable with non-meat food was not restricted at a 5% level of significance. This implies that the separability assumption could be strongly plausible in the empirical work. Own-price elasticities were negative. The fact implies meats concerned are normal goods as expected. The expenditure elasticities are saying that non-meat food is more elastic that meats. The compensated cross price elasticities shows some strong competitiveness in expenditures and/or strong substitutes between beef and pork in recent years. Also the rest of meats are net substitutes in the analysis period.

정부개혁의 비판적 성찰과 전략적 대안

전영평,김병섭,이승종,Robert F. Durant 大邱大學校 社會科學硏究所 2001 社會科學硏究 Vol.9 No.2

세계 각국의 정부 개혁 추세에 맞추어 한국 정부도 정부 개혁을 수행하고 있지만 그 성과에 대한 정확한 평가에 대해서는 의견이 일치하지 않고 있다. 무엇보다도 정부 개혁을 만병통치약으로 받아들이는 태도를 경계하여야 하며, 성과에 대한 성급한 판단 이전에 정부개혁과 관련한 다양한 문제점들을 잘 살펴보는 일이 선행될 필요가 있다. 이 연구에서는 김대중 정부의 개혁 정책-정부구조조정과 인사개혁의 두 차원-의 문제점에 관하여 비판적인 성찰을 하고, 한국의 정부개혁의 위상을 파악하고자 하였다. 비록 엄밀한 실증적인 분석을 하지는 못하였으나 질적인 담론을 통하여 김대중 정부의 개혁의 문제점 및 과제를 제시하고자 하였다. 정부 구조 조정 분야에서는 1) 개혁의 방향성 및 일관성 문제, 2) 조직 분권화 및 민주화 문제, 3) 정책 조정 문제, 4) 권한의 하부 위임 문제, 5) 인력 감축 관리 문제, 6) 공무원 전문성 제고 문제, 7) 책임운영기관제도의 문제, 8) 개혁의 시기와 방법 문제 등이 지적되었으며, 인사개혁(개방형임용제도) 분야에서는 1) 민간과 공직간의 신뢰관계 축적 미흡, 2) 공직과 민간의 이익과 목표간의 부합도가 낮은 상황에서 개방형 직위제가 적용, 3) 공직과 민간간의 협력 훈련 경험 부족, 4) 개방형직위제의 선정 작업이 공직 내부에서의 토의를 배제한 채 외부의 경영진단기관의 판단에 따라 하향적으로 적용되었다는 문제가 지적되었다. 결론적으로 이 연구는 한국의 정부 개혁은 빈약한 정부 개혁 논리 속에서 내부적인 합의와 신뢰관계를 구축하지 못한 채 제대로 된 위상을 정립하지 못하고 있기 때문에 향후 정부 개혁이 많은 시행 착오를 겪을 것으로 예상하였다.

The Korean Speech Act of Refusals:Sociopragmatic Analysis

Andrew Sangpil Byon 한국사회언어학회 2003 사회언어학 Vol.11 No.1

Byon, Andrew Sangpil. 2003. The Korean Speech Act of Refusals: Sociopragmatic Analysis. 사회언어학, 11(1). 외국어 습득에서의 화용론의 역할에 관한 관심이 높아지면서 중간 언어 화용론(jnterlanguage pragmatics)에 관한 연구가 최근 들어 많이 이루어지고 있다. 그러나 영어를 모국어로 하는 KFL 학습자를 대상으로 한 중간 언어 화용론 연구는 매우 미흡한 실정이다. 이에 본고에서는 보다 활발한 한국어 중간 언어 화용론 연구를 위해 먼저 기존의 중간 언어적 화용론 자료 수집 방법론(data-gathering methodology)에 대해 논의하고 한국어를 이용한 written discourse completion task(DCT)를 Brown and Levinson(1987)의 두개의 사회적 변수인 power와 distance에 근거해서 개발하였다. 그 DCT를 이요해서 30명의 한국 대학생과 30명의 영어를 모국어로 하는 한국어 학습자의 한국어 거부 발화 행위를 비교 조사 분석 해 보았다. 그리고 모국어 전의 영향(L1 transfer effect)을 분석하기 위해 30명의 미국 대학생의 영어 거부 발화 행위를 조사하여 한국어 학습자의 결과와도 비교했다. 분석 결과로는, 먼저 12 종류의 거부의 주된 행위 전략(refusal head acts)과, 5종류의 거부 지지 행위 전략(refusal supportive move)을 사용하고 있음을 알아냈으며, 학습자의 한국어 거부 발호 행위에서 나타난 모국어 전이의 영향에 대해 논의했다. 그리고, 사회적 변수가 발호 행위에 미치는 영향을 Sohn(1986)의 수직론(hierarchicalism)과 간접론(indirectness)에 근거해서 한국 대학생과 학습자의 발화 행위를 설명했다. 본고의 결론에서는 이런 연구 결과들을 실제로 한국어 중간 언어 화용론 연구와 외국어로의 한국어 교육에 어떤 식으로 반영시켜야 할 지를 논의했다.

Unprecedented Insulator-to-Metal Transition Dynamics by Heterogeneous Catalysis in Pd-Sensitized Single Vanadium Oxide Nanowires

Byon, Ji Won,Park, Joonmo,Kim, Sung Youb,Kim, Myung Hwa,Baik, Jeong Min American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.42

<P>We report an unprecedented insulator-to-metal transition of the Pd-nanoparticle-decorated, single vanadium dioxide nanowires caused by the heterogeneous H<SUB>2</SUB>–Pd catalytic reactions. Upon hydrogen gas exposure, the Pd–VO<SUB>2</SUB> heteronanostructure shows a remarkably large current increase (∼1000-fold) at a temperature 10 °C lower than the insulator-to-metal transition temperature in the bulk. This current increase occurs slowly over the duration of several seconds to several tens of seconds, depending on the Pd coverage, temperature, and hydrogen concentration. After hydrogen flow is shut off, the conductance is not immediately returned to the original value and it takes several hours, indicating that the atomic hydrogens, produced by the dissociative chemisorption on Pd, are incorporated into VO<SUB>2</SUB>. From the electronic transport measurements and finite element analyses, we suggest that the slow transition is mainly due to the formation of alternating domains of metal and insulator regions of the VO<SUB>2</SUB> crystal lattice, produced by the generated heat via the exothermic catalytic process. The current response toward hydrogen gas is also found to be reversible after the heating process. This novel finding thus has significant implications for the effective engineering of the physicochemical properties of vanadium dioxide by a heterogeneous catalytic process.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-42/jp407273s/production/images/medium/jp-2013-07273s_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp407273s'>ACS Electronic Supporting Info</A></P>

Acute stroke from tumor embolus in a patient with cardiac sarcoma: Aspiration thrombectomy with Penumbra catheter

Byon, Jung Hee,Kwak, Hyo Sung,Chung, Gyung Ho,Jang, Kyu Yun SAGE Publications 2016 Interventional neuroradiology Vol.22 No.1

Investigation of the size effect on crack propagation using finite element method and strain gradient plasticity

Byon, S.M.,Kim, H.S.,Lee, Y. Elsevier 2007 Journal of materials processing technology Vol.191 No.1

In this work, we have employed the strain gradient plasticity theory into the continuum mechanics to investigate the size effect of material on the crack propagation of micro-sized copper. Constitutive equation was re-formulated in terms of strain gradient and intrinsic material length. Elastic-plastic finite element method was adopted and revamped to reflect the strain gradient effect during deformation and crack propagation. We calculated the strain gradient at each element using the least square function. To demonstrate the size effect, the proposed approach has been applied to mode-I crack growth problem. It shows that as material size comes near to the intrinsic material length, the crack propagation behavior is quite different compared with that computed from the conventional plasticity theory.

Effect of Post-N+Implantation on the Microstructure of the Interfacial Non-Cubic BN Layers

Byon, Eungsun,Lee, Sunghun,Kim, Jongkuk,Lee, Gunhwan,Han, Seunghee,Lee, Eungjik,Yoon, Jae-Hong,Lee, Sang-Ro 대한금속학회 2002 METALS AND MATERIALS International Vol.8 No.1

Plasma source ion implantation has been applied as a post treatment in order to modify the interfacial sp^2 bonded layer of the cubic BN (cBN) films. The effect of ion irradiation on the microstructure of the noncubic BN layer was investigated. From HRTEM observation, the thickness of the BN layer of the representative sample was about 100 nm including 15 nm of initially grown non-cubic layer at the interface between a substrate and the cubic layer. At optimal plasma source implantation conditions, an acceleration voltage of 50 keV and an ion dose of 2×10 exp(16) ions/㎠, the microstructure of the interfacial non-cubic BN layer was changed. It was noticed that the ion irradiation caused the recrystallization of the amorphous phase and transformed the small crystallites into another phase. The micro-hardness of the complex consisting of a hard and soft layer increased as a result of phase transformations. This was caused by atomic displacements in the initially grown amorphous and hexagonal layers. The atomic displacements calculated by the TAMIX code were in the range of 0.31∼0.52 nm per atom within 70∼100 nm in depth.

Experimental and Semi-analytical Study of Wear Contour of Roll Groove and Its Applications to Rod Mill

Byon, Sang-Min,Lee, Youngseog The Iron and Steel Institute of Japan 2007 ISIJ international Vol.47 No.7

<P>In this study, we propose a semi-analytical model which predicts the wear contour of grooved roll in the oval–round (or round–oval) pass rolling process. In the proposed model, the wear contour is assumed to be of a second order polynomial function and computed by using the linear interpolation of the radius of curvature of an incoming workpiece, that of roll groove and a weighting function which takes into account roll force, longitudinal contact length of work roll that undergoes during rolling, property of work roll and roll tonnage. The validity of the proposed model has been examined by applying it to the roughing train in the POSCO No. 2 Rod Mill.A wear measurement system of roll groove has also been developed. Roll wear contour was measured using ‘resin plastics’ which can flow, under small external load, without restraint into any region worn out. The deformed resin plastics, <I>i.e.</I>, roll wear contour, was measured.Results show the proposed model in this study, in overall, has a reasonable accuracy in predicting the roll wear contour but the model underestimates slightly the measurements as the roll speed increases. Roll wear has been found to be linearly dependent on the longitudinal contact length of work roll, roll tonnage, but non-linearly on the roll force and inverse proportional to hardness of work roll.</P>

Numerical study of a SiC mould subjected to a spark plasma sintering process

Byon, Chan,Li, Ming-Han,Kakegawa, Kazuyuki,Han, Young-Hwan,Lee, Dong-Yeon Elsevier 2015 Scripta materialia Vol.96 No.-

<P>Spark plasma sintering (SPS) is a material processing technique based on the Joule heating of a mould and powder under an electrical pulse or DC current. This study demonstrates the use of silicon carbide (SiC). A finite-element numerical study was performed to predict the temperature and stress distributions during SPS. In addition, it was found experimentally that SPS using SiC exhibits similar behaviour to that with a conventional graphite die.</P>