$Al_2O_3-ZrO_2$ 복합체의 강도 및 열충격 저항의 향상에 관한 연구

황규홍,배원태,최명덕,오기동,김경운,김환,Hwang, K.H.,Bae, W.T.,Choi, M.D.,Oh, K.D.,Kim, K.U.,Kim, H. 한국세라믹학회 1988 한국세라믹학회지 Vol.25 No.3

$Y_2O_3$가 $thickapprox$1mol.% 고용된 정방정 지르코니아를 알루미나에 20vol.% 섞어 체조립에 의해 과립으로 만든 다음 여기에 알루미나에 단사정 지르코니아를 10 ~30 vol.%섞어 만든 과립을 15~30vol.%가 되도록 과립형태로 분산시켜 성형 및 소결함으로써 단사정 및 정방정 지르코니아의 분산영역이 서로 다른 불균질 조직의 $Al_2O_3-ZrO_2$복합체를 제조하여 강도 및 열충격 거동을 관찰하였다. 이러한 불균질 조직의 $Al_2O_3-ZrO_2$ 복합체는 분산 agglomerate 내의 낮은 소결밀도에 의한 기공의 존재, 단사정상에 의한 미세균열, 또 이에 따른 주위에의 압축응력 등이 복합적으로 작용하여 향상된 열충격 거동을 보여 주었다. The strength and thermal shock resistance of $Al_2O_3-ZrO_2$ composites have been studied. The tetragonal $ZrO_2$ powder containing 1 mol.% $Y_2O_3$ and monoclinic $ZrO_2$ powder were prepared by coprecipitation method and subsequently mixed with $Al_2O_3$ powder and granulated by sieving. Duplex composites were prepared by dry mixing matrix agglomerate with 15 to 30 vol.% of dispersion agglomerate, followed by pressing and sintering at 1$600^{\circ}C$ for1 hr. These $Al_2O_3-ZrO_2$ 2 composites having heterogeneous structure showed improved thermal shock behaviors because of the microcracking and pores in dispersed granules, and compressive stresses around dispersed granules resulting from $ZrO_2$ transformation.

중소기업 물류설비 시스템 합리화 사례

황규홍,Hwang, Gyu-Hong 한국물류협회 2005 물류혁신 컨퍼런스 Vol.13 No.2

이중조직을 갖는 Y-TZP/Y-TZP-$Al_2O_3$ 복합체의 열충격 거동

황규홍,김의훈,김환,Hwang, K.H.,Kim, E.H.,Kim, Hwan 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.4

Duplex composites such as Y-TZP/Y-TZP-20 wt.% Al2O3 and Y-TZP/Y-TZP- 40 wt.% Al2O3 were made by mixing the sieve-shaked granules followed by isostatic pressing and sintering at 150$0^{\circ}C$ for 1 hour. So Y-TZP became matrix region and Y-TZP-20 wt.% Al2O3 or Y-TZP-40 wt.% Al2O3 became dispersed regions. In these composites, propagating cracks due to thermal shock always run into the dispersed region because these regions act as compressive zone due to low thermal expansion than matrix region. So duplexes having dispersed regions of Y-TZP-40 wt.% Al2O3 showed higher retained strength after thermal shock than matrix only composites because crack propagations were stopped more or less in the dispersed region. But when crack propagations were much more easy than matrix like Y-TZP-20 wt.% Al2O3 region, retained strength was decreased than the matrix only composites despite of the low initial strength.

무기재료공학과의 현황과 개선 방안

황규홍,Hwang, Gyu-Hong 한국대학교육협의회 1989 大學敎育 Vol.41 No.-

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

Kyu-Hong Hwang(황규홍) 한국생성문법학회 2006 생성문법연구 Vol.16 No.3

  The generative view of autonomy of syntax has been criticized by most cognitive-functional grammarians and claimed to be incompatible with or unable to account for iconicity that exits in natural human languages. Given this, this paper attempts to explain some iconic aspects in English syntax from a generative perspective in an effort to argue against this cognitive-functional criticism. After examining "structure-concept iconicity" in lexical category phrases and sentential complementation in Newmeyer"s (1992, 1998) sense, I propose the following generative principles of iconicity, embellishing Hwang"s (2005) idea: (ⅰ) when a head is modified by multiple adjuncts, the fewer maximal projections of the head there are between the head and the adjunct, the closer the semantic relation between them is; (ⅱ) when a verb takes minimal pair/set clausal complements, the fewer and morphologically poorer functional heads(C and T) there are between the matrix verb and its clausal complement, the closer the semantic relation between them is. I then claim that Haiman"s (1983, 1985, 1994)"s iconicity of distance, a sub-principle of structure-concept iconicity, is compatible with generative grammar, to a large extent, in that it is well represented structurally in generative grammar outlined in Chomsky (1995, 2001, 2005): the semantically closer the two syntactic objects are, the more local their syntactic relation is in the light of hierarchical structure.

A Usage-based Paradigmatic Construction of Over

Cheng Lin,황규홍(Kyu-Hong Hwang) 한국영미어문학회 2021 영미어문학 Vol.- No.141

By virtue of categorization and prototype theories, cognitive semanticists have proposed different models for the polysemy of over since the 1980s. However, the previous studies are problematic in both theory and method. To improve them, this paper argues for usage-based research to construct the polysemy of over in the paradigmatic dimension, following Lin and Hwang’s (2021) analysis of the syntagmatic construction of over. Based on Saeed’s (2016) contextual distinction between vagueness and ambiguity, it proposes an ambiguity analysis, where the fuzzy boundary of two related senses of a lexical polysemy can be interpreted in terms of ambiguity. Drawing on usage-based lexico-grammatical evidence generalized from BNC data, this study sorts out six basic level senses/usages of over. Then, a comparative analysis is made between “above-across” and “covering” usages, of which the result shows that “above-across” over is more typical than “covering” over from the usage-based perspective. What’s more, it also supports a possible connection between the two usages, since “covering” over resembles the “horizontally resting on” association of “above-across” over in both form and meaning.

미국 메인 스트리트 프로그램의 전문가 인증 프로그램 고찰

황규홍(Hwang, kyu-Hong),고지영(Ko, Ji-Yeong) 한국주거학회 2017 한국주거학회 학술대회논문집 Vol.29 No.1

The urban regeneration educational programs needs to be systematically developed considering the expertise, locality, and inclusiveness. However, the existing the urban regeneration educational programs in Korea has the limitations in improving the quality of experts. The purpose of this study is to analyze the characteristics of the expert certification program of the "Main Street America" in the United States and to find out how to apply it the domestic expert certification program. The data for the analysis was collected through literature review using the academic databases. The collected data were analyzed on the basis of the operating organization system, a program operation principle, and the expert certification system characteristics. The implication of a expert certification program of "Main Street America" were the diversity of the educational program contents and a educational method through the urban regeneration projects, the organizational operating system, and the four-point approach(organization, promotion, design and economic restructuring). This study gives implications of the establishment for the national urban regeneration expert certification program.

The Origins and Development of the Classical Word Class System

Hwang Kyu-Hong(황규홍) 새한영어영문학회 2004 새한영어영문학 Vol. No.

모국어 및 외국어 교육 그리고 언어 연구에 있어서 품사(/문법 범주)는 중요한 역할을 한다. 전통적으로 대부분의 영문법학자들은 영어에 8 품사가 존재하며 이러한 품사체계는 고대 그리이스어와 라틴어 문법에서 유래되었다고 주장한다. 본 논문에서는 이러한 영어의 8 품사체계의 기원과 발달과정을 서구 언어학 연구의 통시적 관점에서 살펴보고자 한다. 전통적 품사체계의 기원과 발달과정을 요약하면 다음과 같다. 먼저 플라톤이 처음으로 명사와 동사를 구분 지었고 아리스토텔레스가 여기에 접속사를 첨가했으며, 초기 스토아학파 학자들이 아리스토텔레스의 접속사를 접속사와 관사로 다시 양분하였다. 이러한 4 품사 체계를 후기 스토익 학자들이 병사를 고유명사와 보통명사로 세분화하고 부사를 첨가하여 6 품사 체계를 완성하였다. 그리고 알렉산드리아 문법가인 아리스타커스가 후기 스토익 시대에 양분된 명사를 통합하고 전치사, 대명사, 분사 등을 첨가하여 현재까지 널리 사용되고 있는 8 품사 체계를 구축하였다. 라틴어 문법학자들은 관사 대신에 감탄사를 독립된 품사로 인정하고 나머지는 그대로 그리이스어 품사체계를 수용하였다. 반면에 프리스틀리가 18세기 초에 분사를 형용사로 대치한 이후 대부분의 초기 영문법학자 및 현대 영문법학자들은 그리이스어 및 라틴어 문법에서 비롯된 전통적 8 품사 체계를 받아들였다.

The Structure of Causative Verb Complements in English

Hwang Kyu-Hong(황규홍) 새한영어영문학회 2006 새한영어영문학 Vol.48 No.3

Given that little attention has been paid to the syntactic aspects of Causative Verb Complements (CVCs) in English, this paper aims to examine various syntactic phenomena of such CVCs from a generative perspective. In particular, it lays focus on their constituency, category, and case valuation of their DP subjects. It has been claimed that the CVC of [DP, VP] is a single unit and the DP is the subject of the CVC. Supporting evidence for this claim comes from many syntactic facts: coordination facts, binding phenomena, the behaviors of subject-oriented idioms and adjuncts, the occurrence of expletives, facts about the floating emphatic reflexive, not-initial DPs, and alone-final DPs. After arguing against previous CP and VP analyses of the CVC, I have proposed that CVCs are clausal constituents with the category of TP whose head T is defective, laking ∮ -complete in the sense of minimalist syntax. With respect to the case valuation of the CVC subject, it has been stressed that the overt subject is an active Goal but cannot be valued by the Tdef of the CVC under Chomsky's (1995, 2000, 2001, 2005) Agree Theory. Then, the subject has been said to agree with the matrix light verb v and receive an accusative case value, as in typical ECM constructions.

植物病 豫察을 위한 局地氣象觀測의 自動化

황규홍(Kyu-Hong Hwang),윤진일(Jin-Il Yun),박은우(Eun-Woo Park) 한국기상학회 1994 Asia-Pacific Journal of Atmospheric Sciences Vol.30 No.4