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      • KCI등재

        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.

      • KCI등재

        <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.

      • 화력발전소 정비관리 최적화 방안 연구

        하정수,정훈,유근봉,김순교 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.11

        Today, there are large number of equipments in power plant and they are very complex and various. So, it is not easy to establish proper policy in maintenance management. Because each plant has its own management policy by different operating environment and culture, we cannot apply same maintenance optimizing method to all plant. In this paper, we will review several method for optimizing maintenance management for plant, especially fossil power plant and consider merits and demerits. Finally, we will study how to optimize it by deciding or changing the maintenance period and method of each equipment(system) with RCM(Reliability Centered Maintenance)

      • KCI등재

        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.

      • KCI등재

        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”.

      • KCI등재

        방위끌림이 없는 장애물에 대한 함정의 충돌회피 기준에 관한 연구

        하정수,정연환 한국항해항만학회 2019 한국항해항만학회지 Vol.43 No.6

        Naval ships that are navigating always have the possibility of colliding, but there is no clear maneuvering procedure for collision avoidance, and there is a tendency to depend entirely on the intuitive judgment of the Officer Of Watch (OOW). In this study, we conducted a questionnaire survey when and how to avoid collision for the OOW in a Constant Bearing, Decreasing Range (CBDR) situation wherein the naval ships encountered obstacles. Using the results of the questionnaire survey, we analyzed the CBDR situation of encountering obstacles, and how to avoid collision in day/night. The most difficult to maneuver areas were Pyeongtaek, Mokpo, and occurred mainly in narrow channels. The frequency appeared on average about once every four hours, and there were more of a large number of ships encountering situations than the 1:1 situation. The method of check of collision course confirmation was more reliable with the eye confirmation results, and priority was given to distance at closest point of approach (DCPA) and time at closest point of approach (TCPA). There was not a difference in DCPA between the give-way ship and stand-on ship, but a difference between day and night. Also, most navigators prefer to use maneuvering & shifting when avoiding collisions, and steering is 10-15°, shifting ±5knots, and the drift course was direction added stern of the obstacles to the direction of it. These results will facilitate in providing officers with standards for collision avoidance, and also apply to the development of AI and big data based unmanned ship collision avoidance algorithms. 항해 중인 함정은 늘 충돌 가능성이 존재하지만 충돌회피를 위한 명확한 기동지침은 없고 함교 당직사관의 직관적 판단에 의존하는 경향이 있다. 본 연구에서는 항해 중인 함정이 방위끌림이 없는 장애물을 조우하는 상황에서 함교 당직사관을 대상으로 언제 어떻게 충돌을 회피하는지 설문조사를 실시하였다. 설문 결과를 활용하여 방위끌림이 없는 장애물 조우 상황, 주·야간 충돌 회피 방법을 분석하였다. 조함이 까다로운 지역은 평택, 목포 순이었고, 주로 협수로 내에서 발생하였다. 빈도는 4시간 항해 시 평균 1회 정도로 나타났으며, 1:1 조우 상황보다 다수 선박 조우가 많았다. 충돌침로 확인 시 전자해도보다 육안 확인 결과를 더 신뢰하였고, 충돌회피 고려 요소로 최단 접근거리, 최단 접근시간을 우선시하였다. 피항의무선과 침로유지선의 충돌회피 기동상 특별한 차이는 없었지만 주·야간 시 최단 접근거리의 차이는 존재했다. 충돌회피 시 대부분의 항해사들은 변침·변속을 함께 사용하는 것을 선호하며 타각 10~15°, 변속 ±5knots, 변침침로는 타함 함미 정방향에서 함미 가중치를 두었다. 이러한 결과들은 승조원들에게 부임 함정의 충돌 회피 기준을 제공하는데 도움이 될 것이며 나아가 AI, 빅데이터 기반의 무인함정 충돌회피 알고리즘 개발에도 적용될 것이다.

      • KCI등재

        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.

      • 류마티스 관절염 환자에 동반된 뇌 경막염 1예

        하정수,윤보영,김인기,최정식,김동욱,강창일 인제대학교 1999 仁濟醫學 Vol.20 No.2

        Rheumtoid pachymeningitis is an extremely rare disease and only 17 cases were reported in the literatures. We report a case of pachymeningitis in a patient with a longstanding rheumatoid arthritis(RA). A 48 year-old woman was admitted to this hospital because of severe headache, nausea, vomiting, and diplopia. Twelve years prior to admission, she was diagnosed as rheumatoid arthritis and has taken prednisolone, hydroxychloroquine, and methotrexate. The diagnosis of rheumatoid peachymeningitis was made after magnetic resonance imaging (MRI) of the brain and biopsy of the leptomeninx. The pachymeningitis should be considered as a diagnostic possibility in RA patients who have prolonged headache and Gd-DTPA MRI is recommended to demonstrate the meningeal involvement.

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