화력발전소 장수명화를 위한 부식저감 대책 기술

하정수 한국부식학회 1998 Corrosion Science and Technology Vol.27 No.3

A large percentage of fossil power plants have been in operation for such long durations that they are currently used beyond their of failures that engineer should take into account for the development of life extension technique. Corrosion is one of main concern in old power plants, and causes of breakdown can be stress corrosion cracking, caustic attack, oxygen pitting, hydrogen damage, high temperature corrosion, fire-side corrosion, corrosion fatigue, and the combination of these damages, Understanding the cause of failures can help to prompt corrective measures. Another key ingredient in plant life extension is the remaining-life-assessment technology. To improve the accuracy of life evaluation, corrosion term should be considered and modified with the conventional mechanical terms. This investigation is describing a new method of life evaluation which incorporates corrosion concept for life extension.

200MPa급 초고강도 콘크리트의 자기수축 특성에 관한 실험적 연구

하정수,백민수,손유신,이승훈,이영도,정상진 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.8

Low W/B ultra-high strength concrete has low porosity and discontinuous capillary tube in the cement milk. Within a few days after placement, autogenous shrinkage occur because of the quick drying from the self-desiccation. So, the possibility of cracking is higher than the normal strength concrete. In this study, the autogenous shrinkage deformation characteristics of ultra-high strength concrete that are different from the normal strength concrete were examined. A new shrinkage formula is suggested form the experiment data. The conclusion is as follows. 1) The 91days strength of the concrete combination that are W/B 12.5%, normal portland cement 55%, china silica fume 20%, GGBFS-2 20%, anhydrite 5% was the best result, 193.7MPa. So, it is the appropriate combination for the 200MPa grade ultra-high strength concrete. 2) The autogenous shrinkage deformation of W/B 20% ultra-high strength concrete can be predicted using the suggested shrinkage formula.

Properties of Porous SiC Ceramics Prepared by Wood Template Method

하정수,임병구,도금현,강인애,김창삼 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.4

Porous SiC samples were prepared with three types of wood (poplar, pine, big cone pine) by simply embedding the wood charcoal in a powder mixture of Si and SiO2 at 1600 and 1700oC. The basic engineering properties such as density, porosity, pore size and distribution, and strength were characterized. The samples showed full conversion to mostly β-SiC with good retention of the cellular structure of the original wood. More rigid SiC struts were developed for 1700oC. They showed similar bulk density (0.5~0.6 g/cm3) and porosity (81~84%) irrespective of the type of wood. The poplar sample showed three pore sizes (1, 8, 60 μm) with a main size of 60 μm. The pine sample showed a single pore size (20 μm). The big cone pine sample showed two pore sizes (10, 80 μm) with a main size of 10 μm. The bend strength was 2.5 MPa for poplar, 5.7 MPa for pine, 2.8 MPa for big cone pine, indicating higher strength with pine.

日本 天理大學 所藏 活字本 楞嚴經諺解 권5, 권6의 교정 연구

하정수 구결학회 2018 口訣硏究 Vol.41 No.-

This study aimed to look into correction of printed book of Volume 5, 6 Neungeomgyeong-eonhae kept in Tenri Central Library in Japan. And We compared with other printed book and woodblock book. A previous study of these document was researched on black and white photographic copy. Therefore, it was difficult to grasp the details of the condition of the paper that can be grasped only through the actual documents. For example the red color of the red ink used for correction. This time, we confirmed this part through examining the actual documents. In volume 5, some new correction was found. And we found new 14 parts that were not included Kanno Hiroomi(菅野裕臣 1983) in volume 6. After the corrections were compiled, the corrections were divided into the copula(ㅣ-), the translation, the side dot, the Chinese character sound, and the correction of paper cutting and moving(補正). Volume 5 had little error in the report of Kanno Hiroomi(1983), because it was able to compare the printed book kept in the Kyujanggak of Seoul National University. On the other hand, Volume 6 had about 14 missing parts of the reportof Kanno Hiroomi(1983). Because this document did not have a comparison object. This study found that those who did not appear in black and white photographic copy and Kanno Hiroomi(菅野裕臣 1983). Correction of the printed book of Volume 5, 6 Neungeomgyeong-eonhae kept in Tenri Central Library can be divided into correction of copula ‘ㅣ-’, correction, side dot correction, correction of Chinese character sound, correction related to vowel harmony, the correction of paper cutting and moving(補正) etc. It was found that the correction was not able to be grasped precisely because it was able to compare only with the woodblock print because there was no other printed book type that could be compared at the time of the study. 이 연구는 日本 天理大學 圖書館 所藏의 楞嚴經諺解(活字本 권5, 권6)의 교정 내용을 살펴보고 그 결과를 정리하여 보고하는 것이다. 또한 菅野裕臣(1983)의 活字本 楞嚴經諺解 권5, 권6의 교정 내용 중 미비한 점을 이 보고를 통해 보완하였다. 天理大本 능엄경언해 권5의 교정 사항은 金秉九 소장 활자본 권5와 비교하여 추가 사항을 이전의 연구에 보충하였고, 天理大本 능엄경언해 권6의 교정 사항은 현전하는 救仁寺 소장의 활자본 권6과 전체적으로 다시 비교하여 이전의 연구 성과를 보충하였다. 실책 조사 결과 『朝鮮學報』 106호(1983)의 흑백 영인본에 나타나지 않은 補正 부분과 菅野裕臣(1983)에 수록되지 않은 교정 내용을 확인할 수 있었다. 권5에서는 교정 부호 모양의 차이, 방점 삭제 爻周 등이 새로 발견되었다. 권6에서는 菅野裕臣(1983)에 수록되지 않은 부분을 14곳 발견할 수 있었다. 2장은 이 문헌의 서지 사항을 살펴보았다. 3장은 문헌에 나타난 교정 사항을 종합하여 목판본 언해의 해당 부분과 비교하고, 두 권의 교정 내용을 계사 ‘ㅣ-’, 번역 내용, 방점, 한자음, 補正 등으로 나누어 살펴보았다. 天理大本 능엄경언해 권5는 菅野裕臣(1983)의 보고에 오류가 거의 없었다. 활자본인 서울대 규장각 소장 가람문고본과 天理大本을 상호 비교할 수 있었기 때문이다. 반면 天理大本 능엄경언해 권6은 菅野裕臣(1983)의 보고에 빠진 부분이 있었다. 연구 당시 비교할 수 있는 다른 활자본이 없어 목판본과만 비교할 수 있었기 때문에 교정 내용을 정밀하게 파악하지 못했던 것으로 판단된다.

초임계 화력발전소용 12 Cr 강의 고온 소형펀치 거동에 관한 연구 ( High Temperature Small Punch Behaviors of 12 Cr Steel for Supercritical Power Plant )

하정수,E. Fleury,현중섭,김건영,백수곤 대한기계학회 1997 대한기계학회 춘추학술대회 Vol.- No.-

회원의 소리 : 기업의 접대비와 연구 개발비

하정수 대한기계학회 1999 기계저널 Vol.39 No.11

[기계분야 국가지정 연구실]한전 전력연구원 고온고압설비 수명평가 연구팀

하정수 대한기계학회 2003 기계저널 Vol.43 No.2

現代國語 形態素 {ㅅ}의 意味와 機能

하정수 한국어문교육연구회 2010 어문연구(語文硏究) Vol.38 No.2

이 論文은 現代國語 語尾에서 形態 ‘ㅅ’을 分析할 수 있고, 이 ‘ㅅ’이 形態素의 資格을 가지며 統辭的인 機能을 하고 있음을 論證하고자 한다. 語尾에서 分析되는 形態素 {ㅅ}은 談話에서 聽者에 대한 先行 言語 表現에 대한 [確認]의 機能을 修行한다. 또한 名詞와 名詞 사이에 存在하는 이른바 사이시옷의 機能이 先行 名詞에 대한 確認을 통해 선행 명사를 强調하는 기능을 遂行하고 있음을 살펴보았다. 中世國語에서 사이시옷이 待遇法과 관련한 統辭的 機能을 할 가능성에 대한 논의에 대해서도 살펴보았다. 結論的으로 語尾에서 分析한 形態素 {ㅅ}과 명사와 명사 사이에 존재하는 이른바 사이시옷은 그 基本 意味와 機能에서 同一한 役割을 遂行하는 同一 形態素일 可能性을 제시하였다. 이 論文은 窮極的으로 同一한 形態가 同一한 意味를 갖는다는 原則에 어미에서 分析되는 形態素 {ㅅ}과 명사와 명사 사이에 存在하는 사이시옷도 符合하는 것임을 밝히고자 하였다. This paper aims to examine basic meaning and function of morpheme {ㅅ} that analysed at endings in contemporary Korean. In chapter Ⅱ, we analyze the position of morpheme {ㅅ} that located in endings. And we analyze the position of morpheme {ㅅ} that located between a noun and a noun. In chapter Ⅲ, we examine the meaning and function of morpheme {ㅅ} that analysed in endings. In chapter Ⅳ, the saisiot(사이시옷) that exist between a noun and a noun is possible to have same function of morpheme {ㅅ} that analyzed at endings in side of basic meaning. In conclusion, the basic meaning of morpheme {ㅅ} in contemporary Korean is confirmation of a hearer. The confirmation of a hearer brings about emphasizing preceding utterance. The purpose of this paper is ultimately to examine the principle that “one form has one basic meaning, one basic meaning has one form”.

<千手千眼觀自在菩薩廣大圓満無礙大悲心大陀羅尼>연구-日本 駒澤大學圖書館 江田文庫 所藏本에 대하여-

하정수 국어사학회 2019 국어사연구 Vol.0 No.29

This paper is purpose to decide the document name of the “Cheonsucheonangwanjajaebosalgwangdaewonmanmuaedaebisimdaedarani(千手千眼觀自在菩薩廣大圓満無礙大悲心大陀羅尼)” which is kept in the Komazawa University Library of Japan. And to examine bibliographical information, Hangul notation and interpretation of its Korean translation. First, this document was published by royal figures in 1476 when it was identified through publish information notes and bibliography. Secondly, this document has a significant meaning in relation to the display of Hanja consonants in the Eonhae(諺解) literature as a document in which the real Hanja(漢字) sound are written more than 20 years earlier than the current sound in 『Yukjobeobbodangyeongeonhae(六祖法寶壇經諺解)』 published in 1496. Third, the interpretation of the literature shows only the Korean translation without the Chinese text characters, which shows a different aspect from the interpretation of the publication of the guidebook. Fourthly, the particles and the endings appearing in the language of the document show that vowel harmony is not well observed. It also shows grammatical features that differ from those of the typical Eonhae of the time. 본고는 일본 駒澤大學 도서관에 소장되어 있는 한글판 “千手千眼觀自在菩薩廣大圓満無礙大悲心大陀羅尼”의 서명을 논의하고, 이 문헌의 서지사항과 한글 표기 및 언해 양상을 살펴보는 데 목적이 있다. 첫째 이 문헌은 간기와 서지사항 등을 통해 파악했을 때 1476년에 왕실 관련 인물에 의해 간행된 문헌으로 파악된다. 둘째 이 문헌의 한글 표기 양상은 1496년에 간행된 『六祖法寶壇經諺解』의 현실 한자음 표기보다 20년 이상 앞서 현실 한자음이 표기된 문헌이다. 언해 문헌의 한자음 표기와 관련하여 중요한 의의가 있다. 셋째 이 문헌의 언해 양상은 저경에 해당하는 부분 없이 한글 번역만 나타나고 있어 『楞嚴經諺解』, 『法華經諺解』 등 간경도감 간행의 언해서와 다른 양상을 보여 주고 있다. 넷째 조사, 어미, 부정 표현 등을 비롯하여 이 문헌의 언해에 나타난 문법적 특징을 정리하였다.

비대칭성이 고려된 나선형 시험 모델을 통한 손상 수상함의 직진 안정성 추정

하정수,정연환,Ha, Jeong Soo,Jeong, Yeon Hwan 한국시스템엔지니어링학회 2020 시스템엔지니어링학술지 Vol.16 No.2

In this paper, we estimated the straight line stability by performing a 3 degree of freedom spiral test simulation of a intact/damaged surface combatant using the hydrodynamic coefficient obtained through the PMM(Planar motion mechanism) test based on system engineering process. A model ship was ONR Tumblehome and damaged compartment was set on the starboard bow. As a result of conducting a spiral test simulation based on the experimental results of J.Ha (2018), the asymmetric straight line stability due to the damaged compartment was confirmed. In the case of a ship in which the starboard bow was damaged, it was confirmed that it had the characteristic to deflect to the left when going straight. Also, when estimating the straight line stability of a both port and starboard asymmetric surface combatant, a separated equation of motion model that sees the port and starboard as different ships seems suitable.