Inconel 718 선재의 경도에 미치는 냉간신선가공의영향

정용권,조창용,정병호,김인배,Jeong, Yong-Kwon,Jo, Chang-Yong,Jung, Byong-Ho,Kim, In-Bae 한국재료학회 1998 한국재료학회지 Vol.8 No.4

Inconel 719 선재의 경도에 미치는 냉간신선가공량과 시효시간의 영향을 경도측정과 전자현미경을 사용하여 조사하였다. 고용화처리된 재료의 경도는 245Hzv이었으나 50% 냉간신선가공으로 450Hv까지 증가했다. 경도값은 시효시간이 증가함에 따라 초기에 증가하다 감소하는 것으로 나타났으며, 시효 초기 경도증가는 $\gamma^{"}$과 $\gamma^{'}$ 상의 석출에 의한 것이며, 최고경도 이후의 경도감소는$\gamma^{'}$상이 $\delta$상으로 변태되었기 때문이다. 냉간가공도가 증가함에 따라 최고경도에 이르는 시간은 감소되어 0, 30, 50%가공재들에 대해 각각 30, 10, 5분으로 나타났다. 이는 냉간가공으로 인해 $\gamma^{'}$ / $\gamma^{'}$ 상의 석출이 촉진되었기 때문이다. 50%가공재의 경우 1116K에서 5분 시효로$\Upsilon^{'}$ 및 $\Upsilon^{'}$상들이 석출되었다. 또한 50%가공재에서는 초기경도 이하로 경도값이 감소되었는데, 이와 같은 경도값의 큰 감소는 재결정이 일어났기 때문이다. Effect of cold drawing ratio and aging time on the hardness of lnconel 718 wire aged at 11l6K were investi￢gated by hardness measurement and scanning & transmission electron microscopy. Hardness which was 245Hv in as￢solution treated condition increased very rapidly to 450Hv as cold drawing ratio increased to 50%. The hardness in the early stage of aging was increased by the precipitation of $\gamma^{'}$ and $\gamma^{'}$ phases and after the peak hardness, the hardness was decreased by the transformation of $\gamma^{'}$ phase to $\delta$ phase. The time to reach peak hardness during aging appeared to be reduced with the increase of cold drawing ratio, and those times were 30, 10, and 5 minutes for 0, 30 and 50% cold drawn materials, respectively. For the 50% cold drawn material. $\gamma^{'}$ and $\gamma^{'}$ were precipitated by aging for 5 minutes at 1116K. The hardness in the same material was largely decreased under the initial hardness by the recrystallization.

『There』문에서 한정사의 용인성 문제

정용권(Yong-Kwon Jung) 한국외국어대학교 영미연구소 2005 영미연구 Vol.13 No.-

The purpose of this paper is to examine the characteristics of the postverbal definite noun phrase of both the existential there-sentence and the presentational there-sentence, explore the cause of the difference of its acceptability, and point out some problems related to the analysis of the two constructions. It has been claimed that the there-sentence does not allow the postverbal definite noun phrase to occur in these constructions, but this turns out to be false. Particularly, Birner and Ward (1998) observe that lots of postverbal definite noun phrases occur in these constructions, and that they are sensitive to the contextual restriction. According to them, the postverbal noun phrase in the existential there-sentence must represent an entity which is hearer-new, while the postverbal noun phrase in the presentational there-sentence must represent an entity which is discourse-new. They, thus, insist that these constructions should be pragmatically accounted for. Besides, they argue that the infelicity in the use of such sentences arises from a close but imperfect correlation between the cognitive status to which definiteness is sensitive and that to which postverbal position in there-sentences is sensitive. At any rate, their analysis fails to clearly account for the characteristics of the postverbal definite noun phrases that may occur in these constructions, since it is sometimes apt to make people learning English as a second language confused as to whether some definite postverbal noun phrases represent hearer-new entities or not in some existential there-sentences. Likewise, it is not easy to tell whether some postverbal noun phrases represent discourse-new entities or not in some presentational there-sentences.

Presupposition and Rules for Anaphora

정용권(Yong-Kwon Jung) 한국외국어대학교 영미연구소 2011 영미연구 Vol.24 No.-

Kripke (2009) points out that many presuppositional elements are anaphoric to previous discourse or contextural elements, and claims that we need a theory of presuppositional anaphora, analogous to the corresponding pronominal theory. However, he does not suggest any particular anaphora rules for presupposition. Some presuppositions are related to lexical meanings of particular words, while others are related to particular structures of sentences. Presuppositions related to both lexical meanings and structural characteristics can be dealt with by the semantic anaphoric rule and the syntactic anaphoric rule for presupposition, respectively. On the contrary, presuppositions related to pragmatic aspects can be accounted for by pragmatic anaphoric rules. However, the former are not independent of the latter. In other words, we may regard the former as a part of the latter. For this reason, I propose unified anaphoric rules for presupposition. They capture the nature of presupposition relatively well.

An Optimal So-Inversion Theory

Yong Kwon Jung(정용권) 한국외국어대학교 영미연구소 2009 영미연구 Vol.20 No.-

The so in so-inversion constructions in English is analyzed differently by Quirk et al. (1985) and Toda (2007). Quirk et al. (1985) regard it as not a VP pro-form but an additive adverb, equivalent in meaning to too or also. This analysis may capture some semantic characteristics of this construction. However, it has difficulty in capturing some syntactic characteristics of this construction. Unlike this analysis, Toda (2007) analyzes so in this construction as a VP pro-form. This analysis may capture some syntactic characteristics of this construction relatively well, but it also has some problems on semantic aspects. In this respect, I try to explore some syntactic and semantic characteristics of this construction. I argue that both Quirk et al.'s (1985) and Toda's (2007) analyses are inappropriate in some respects, because they fail to capture some syntactic or semantic characteristics. Therefore, I propose an optimal so-inversion theory that makes up for these problems.

Indefinite Pronouns with APs

Yong-Kwon Jung(정용권) 한국외국어대학교 영미연구소 2008 영미연구 Vol.19 No.-

The purpose of this paper is to examine indefinite pronouns with APs in English, investigate some merits and demerits of the N-raising analysis, examine characteristics of adjectives, and find out an optimal structure of indefinite pronouns with APs. Kishimoto (2000) analyzes indefinite pronouns with APs as overt N-raising. In his analysis, when the indefinite pronoun cooccurs with an adjective, the noun is taken to raise around an underlyingly prenominal adjective as in (1a). In this case, he regards this derivation as parallel with the raising of "light" verbs around a preverbal adverb Above all, this analysis has a merit in that it may capture some characteristics that both common nouns and indefinite pronouns have in common. For instance, both common nouns and indefinite pronouns can be followed by multiple adjectives, even though they both should observe the heaviness condition. This base-generated analysis may account for the indefinite pronoun construction more naturally than the movement analysis does. Therefore, further studies should be focused on this approach.

Cognate Objects and the Case

정용권(Yong-Kwon Jung) 한국외국어대학교 영미연구소 2010 영미연구 Vol.22 No.-

Cognate object constructions are constructions in which a normally intransitive verb occurs with what appears to be a direct object NP whose head noun is the event or state nominalization of the verb. Since cognate objects are, in general, preceded by intransitive verbs, it is difficult to deal with them with respect to the Case under the Government and Binding framework presented in Chomsky (1981). Note that the Objective Case is assigned by transitive verbs in this framework. Therefore, both cognate objects and adverbial NPs cannot be assigned Case without revising the Case-filter discussed in Chomsky (1981). However, these problems can be solved by my revised Case-filter analysis based on ellipsis, without undermining this framework greatly. This analysis can solve problems related to both cognate objects and adverbial NPs relatively well.