제41차 추계학술대회 : 심포지움 ; 유사의료행위에 의한 피부부작용 : 유사의료행위에 의한 피부 부작용의 임상증례 ; 피부 미용실에서 심상성좌창 치료 후에 발생한 부작용 2예

황규홍,김홍직,김영근 대한피부과학회 1989 초록집 Vol.27 No.50

저온 결합 SiC 내화판의 치밀화

황규홍,조명제,백인찬 경상대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.16 No.-

To achieve the good densification of SiC plate at low temperature, the effect and behaviour of V2O5 added for sintering agent was studied. By adding V2O5 powder fairly good wetability between SiC particles improved densification, but V2O5 was removed toward surface after sintering. After sintering, to get a better strength, the effect of clay content was investigated. and about 0.3wt% of clay content was suitable for getting a good strength. Addition of large amount of clay and V2O5 powder was good for getting a high sintering density, but the bending was happened during liquid phase sintering so that to protect bending suitable content of clay and V2O5 powder was studied.

A Gap in Generative Grammar

황규홍 한국언어과학회 1999 언어과학 Vol.6 No.1

산화물과 금속 복합 분말의 Attrition Milling 및 반응소결: I. 분말의 특성에 따른 분쇄 거동

황규홍,박정환,윤태경 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.3

The reaction-sintered alumina and zirconia-alumina ceramics having low firing shrinkage were prepared from the Al/Al2O3 or Al/ZrO2(Ca-PSZ) powder mixtures via the attrition milling. And in this milling process the effect of the characteristics of used powders was investigated. Attrition milling was much more effective in reducing the particle size of ceramic/metal mixed powders than ball milling. Powder mixtures of flake-type Al with coarse alumina was much more effectively comminuted by the attrition milling than the mixtures of globular-type Al with coarse alumina powders. And coarse alumina than fine alumina was much more beneficial in cutting and reducing the ductile Al particles. In the contrary to Al/Al2O3 powder mixtures, Al/ZrO2 powder mixtures was not effectively comminutd. But whether using the alumina ball media or attrition milled with Al2O3 powder rather than Al, the milling efficiency was much more increased.

Zro 입자의 분산방법에 따른 Al2O3/ZrO2 요업체의 특성

황규홍,이종국,김환,김재준,연상흠 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.8

For the homogeneous dispersion of ZrO2 particles in Al2O3/ZrO2 ceramics, Zr-precusors were mixed with oxide Al2O3 powders by chemical routes such as partial precipitation or partial polymerization of Zr-nitrate solutions.In case of the mechanical mixing of ultrafine Al2O3 and ZrO2 oxide powders, relatively homogeneous dispersion was difficult to achieve so that the particle size and distributions of ZrO2 were relatively inhomogeneous after sintering at high temperature. But when the Zr-Y-hydroxide were co-precipitated to ultrafine Al2O3 oxide powders followed by calcinations, homogeneous dispersion of nano-sized ZrO2 particles in Al2O3/ZrO2 composite ceramics were obtained. But because of the coalescence of dispersed ZrO2 particles, dispersed ZrO2 was grown up to more than 0.2㎛(200nm) when sintered at the temperature of higher than 1500℃. But when the sintering temperature was kept to lower than 1400℃ by using nano-sized α-alumina, the particle size of dispersed ZrO2 could be sustained below 0.1㎛. But the coalescence of dispersed ZrO2 between Al2O3 particles could not be avoided so that the mechanical properties were not enhanced contrary to the expectations.So Zr-polyester precursors were precipitated and coated to the surface of ultrafine α-alumina powders by the polymerization of Ethylene Glycol with Citric Acid and Zirconium Nitrate. By this dispersion much more uniform dispersion of ZrO2 was achieved at 1450~1600℃ of sintering temperature ranges. And due to especially discrete dispersion of ZrO2 between Al2O3 particles, their mechanical strength was more enhanced than mechanical mixing or hydroxide precipitation methods.

PDP 전극용 Ag 막대입자 제조

황규홍,박근주,이종국 조선대학교 생산기술연구소 2005 生産技術硏究 Vol.27 No.1

Rod-like silver particles were synthesized by the reaction between the aqueous silver nitrate solution and surfactant. The rod-like silver particles were prepared using silver nanoparticles as seeds and cetyltrirnethyl ammonium bromide as a surfactant. The seed particles showed 10-20 nm in size with uniform Size distribution. The important parameters for the formation of silver rods are the utilization of silver seeds and surfactant. Rod-like silver particles obtained were characterized by transmission electron microscopy and UV-Visible absorption spectroscopy.

A Classical Phonemic Analysis of Mien

황규홍 동아대학교 어학연구소 2000 언어와 언어교육 Vol.15 No.-

Miao-Yao 어족에는 아직 언어학계에 잘 알려지지 않았고, 또 연구되지 않은 Mien 이라는 언어가 있다. 본 연구는 이런 Mien어의 음운체계를 Mien 원어민으로부터 직접 수집한 자료를 통해 파악하고자 하는 것이 주된 목적이다. 분석방법은 전통적인 방법에 따라 먼저 수집한 자료를 토대로 자음, 모음, 이중모음, 성조목록 등을 작성한 후 음성적으로 유사한 의심쌍의 음을 먼저 선정하였다. 그리고 (유사) 최소 대립쌍을 형성하는 음들은 독립적 음소로 규정하고 상보적 분포를 보이는 쌍은 동일한 음소의 변 이음으로 취급하였고 또한 자유변이 현상도 고려하였다. 분석결과 Mien은 30개의 자음, 10개의 단모음, 11개의 이중모음, 7개의 성조가 대조적인 기능을 가지는 것이 밝혀졌다.

산화물과 금속 복합 분말의 Attrition Milling 및 반응소결: II. 분말의 분쇄특성에 따른 반응소결 거동

황규홍,김의훈 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.4

The reaction-sintered alumina and zirconia-alumina ceramics were fabricated from the Al/Al2O3 or Zl/ZrO2(Ca-PSZ) powder mixtures via the attrition milling. And the effects of the milling characteristics of used raw powders on reaction sintering were investigated. After attrition milling and isopressing at 400 MPa the Al/Al2O3 specimen was oxidated at 1200℃ for 8 hours followed by sintering at 1550℃ for 3 hours. Because mixed powders of flake-type Al with coarse alumina was much more effectively comminuted than the globular-type Al with coarse alumina powders, it's sintered body of more than 97% theoretical density was achived, but low contents of Al leads to relatively higher shrinkage of about 8%. And because coarse alumina particles was much more beneficial in cutting and reducing the ductile Al particles, using the coarse alumina powder was much more effective in reaction sintering. Fused Ca-PSZ powder was reaction sintered with Al at 1550℃ for 3 hours and low shrinkage ZrO2-Al2O3 composites were fabricated. But because Al/Ca-PSZ powder mixtures were not effectively milled the reaction sintering and densification was difficult. And the Ca ion in Ca-PSZ grains diffused into alumina grains during sintering so that the unstabilization of Ca-PSZ body was occured which gave the microcracks in the specimens.

A Cognitive Grammar Approach to the English Grammatical Number Category

황규홍,Jing Ying Li 현대영미어문학회 2020 현대영미어문학 Vol.38 No.3

In an effort to eliminate EFL learners’ confusion about the grammatical number category in English, this paper reclassifies the lexical items from a cognitive perspective by categorizing nouns as the typical representation of things and verbs as typical relations. It lays particular focus on the cognitive analyses of prototypical count noun and mass noun as well as their non-prototypical deviations─hybrid nouns. It is suggested that common nouns fall into three groups: objects, substances, and a conceptual blending of object and substance. The blended group is revealed in two ways: the object-substance continuum of things and the uniplex-multiplex continuum of objects. It is contended that the diversity and flexibility of hybrid nouns are due to the fact that these different dimensions of construal contribute to the fluidity of perspectives from which people usually are apt to (i) view substances as objects or vice versa in terms of things or (ii) view multiplex objects as uniplex, or uniplex and amassed objects as multiplex, in term of objects.

Iconicity in English Lexical Category Phrases and Sentential Complementation from a Generative Perspective

황규홍 한국생성문법학회 2006 생성문법연구 Vol.16 No.3