RDB와 OODB를 이용한 Workfolw 관리시스템 정의도구의 설계 비교

박노준,윤청 충남대학교 기초과학연구소 1999 忠南科學硏究誌 Vol.26 No.2

Most software is designed by OOAD(Object-Oriented Analysis and Design) and is implemented by OOPL(Object-Oriented Program Language) for supporting reuse and maintenance. But, it is necessary to be designed by new paradigm to resolve problem that OO Model is stored in RDB. OODB is new concept, which overcomes exposed problem and reflects a trend in these days. In this paper, We study design comparison and implementation of Workflow Management system using OODB and RDB in distributed environment and discuss advantage and disadvantage in each other. The result of Development can provide basic information which DB is suitable for each application.

재생굵은골재를 사용한 콘크리트의 동결융해 특성

성찬용,윤준노,김영익,임상혁,정덕현 충남대학교 농업과학연구소 2003 농업과학연구 Vol.30 No.2

이 연구는 플라이 애시를 결합재 중량의 20%, 재생굵은골재를 천연쇄석굵은 골재의 0%, 25%, 50%, 75%, 100%를 치환하여 압축강도와 동결융해 특성을 구명하였으며, 이 연구를 통해 얻어진 결과를 요약하면 다음과 같다. 1. 재령 28일의 압축강도는 모든 배합비와 W/B 35%에서 400㎏f/㎠이상으로 나타나 고강도콘크리트에 이용될 수 있을 것으로 생각된다. 2. 중량감소율은 동결융해 300사이클에서 1%미만으로 나타났고, 표면박리와 같은 현상은 나타나지 않았으며, 재생골재의 대체율이 증가할수록 감소율은 증가하였다. 3. 초음파진동속도는 동결융해 300사이클에서 19~24%정도의 감소율을 나타내었으며, 재생골재의 대체율이 증가할수록 감소율은 증가하는 경향을 나타내었다. 4. 상대동탄성계슈는 재생골재의 대체율에 따라 60~72%의 범위로 나타내었으며, 재생골재 대체율이 증가할수록 감소하는 경향을 나타내었다. 5. 내구성지수는 모든 배합에서 60이상을 나타내었으나, 재생골재 대체율이 100%일때는 급격히 떨어지는 경향을 나타내었다. 6. 재생굵은골재를 사용한 콘크리트의 압축강도, 중량감소율, 초음파진동속도, 상대동탄성계수, 내구성지수 시험결과를 볼 때, 시험에 사용한 재생굵은 골재는 고강도콘크리트에 사용이 가능할 것으로 판단된다. This study was performed to examine the freezing and thawing properties of the high strength concrete using recycled coarse aggregate. The recycled coarse aggregate was replaced by 0%, 25%, 50%, 75% and 100% of natural crushed aggregate. The compressive strength of the concrete used recycled coarse aggregate was shown in more than 400kgf/㎤ at the curing age 28 days. The weight loss ratio by freezing and thawing was shown in less than 1% at all mix type. The pulse velocity and relative dynamic modulus were decreased with increasing the freezing and thawing cycles. Also, durability factor for the freezing and thawing were decreased with increasing the content of recycled coarse aggregate. But, recycled concrete replaced with recycled coarse aggregate 100% was shown in more than 60 by durability factor in freezing and thawing of 300cycles Accordingly, these recycled coarse aggregate can be used for high strength concrete.

석분과 황토를 사용한 건자재 제품 개발 연구

성찬용,류능환,윤준노,김영익,임상혁 강원대학교 부설 석재복합신소재 제품연구센터 2003 석재연 논문집 Vol.8 No.-

본 연구는 석분과 황토를 사용한 건자재 제품을 개발하기 위하여 황토의 첨가량를 5종류, 석분의 첨가량을 3종류로 하여 총 16종류의 모르타르에 대하여 단위중량, 흡수율, 압축강도, 휨강도, 동탄성계수, 초음파진동속도, 중성화 깊이에 대하여 구명하였다. 단위중량, 압축강도, 휨강도, 동탄성계수 및 초음파진동속도는 황토와 석분의 사용량이 증가할수록 감소하는 경향을 나타내었고, 흡수율과 중성화 깊이는 증가하는 경향을 나타내었다. 주사전자현미경에 의한 관찰에서는 비활성황토의 사용량이 증가할수록 결정이 증가한 것으로 나타났다. 황토의 사용량은 강도적인 측면에서는 결합재량의 40%까지 사용이 가능하고, 흡수율 측면에서는 10%까지 사용이 가능하며, 건자재의 사용목적에 따라 황토의 사용량을 조절하는 것이 필요할 것으로 생각된다. The purpose of this study is to obtain the basic data for the development of construction materialproducts using stone dust and non-active Hwangto. The results of physical and mechanical properties were as follows. The unit weight, compressive and flexural strengths, dynamic modulus and ultrasonic pulse velocity are decreased with increase of the stone dust and Hwangto. The absorption ratio and neutralization depth are increased with increase of the stone dust and Hwangto. In the results of SEM analysis, the crystals are increased with increase of the non-active Hwangto. Accordingly, the Hwangto may be suitably used as a cement replacement material in the construction material products.

상악 견치 후방견인시 MAS(Molar Anchoring Spring)의 저항원 조절에 대한 임상적 연구

김선민,이준노,노준,전윤식 대한치과교정학회 1998 대한치과교정학회지 Vol.28 No.2

마찰견인법으로 상악견치를 후방견인할 때, 저항원상실을 최소로 하며 조절되지못한 경사이동을 예방하기 위한 장치인 MAS(molar anchoring spring)를 고안하여 임상에 적용하였다. 31명(여자 29명, 남자 2명)의 표본에서 MAS를 사용하여 상악견치의 후방견인을 시행하였고, 견인 전후의 측모 두부 방사선 규격사진, orthopantomogram과 치아모형을 채득하였다. 얻어진 정보로부터 상악 제1대구치의 저항원소실 및 상악견치의 경사이동경향을 조사하여 다음과 같은 결과를 얻었다. 1. 상악 제1대구치의 경우 수직정출과 intermolar width의 변화가 없었으며, 시상면에서 적은 양의 저항원소실만이 있었다. 2. 상악 견치의 경우 원심경사 및 약간의 압하가 일어났으며 교합이 깊어졌다는 소견은 보이지 않았다. In maxillary canine retraction by means of sliding mechanics, we designed MAS(molar anchoring spring) to prevent anchorage loss and uncontrolled tipping of tooth movement and have applied it in clinical cases. The anchorage control of the maxillary first molar and type of tooth movement of the maxillary canine were studied in 31 subjects. The measurement were made on cephalograms, orthopantomograms and dental casts. The obtained results were as follows. 1. In case of the maxillary first molar, there was a little sagittal anchorage loss, but there was no vertical & transverse anchorage loss. 2. In case of the maxillary canine, there was distal tipping movement and also there was a little intrusion tendency.

폐석재와 석분을 사용한 식생블럭 제품 개발

성찬용,류능환,연규석,윤준노,김영익,남기성,노경희,박일순 강원대학교 부설 석재복합신소재 제품연구센터 2002 석재연 논문집 Vol.7 No.-

본 연구는 폐석재와 석분을 사용하여 친환경적인 식생블럭 제품을 개발하기 위하여 폐석재의 입경과 석분의 첨가량을 각각 3종류씩 총 9종류의 식생블럭에 대하여 단위중량, 공극율, 투수량, 압축강도, 쪼갬인장강도, 휨강도, 내산성, 알카리농도에 대하여 구명하였다. 단위중량, 강도, 내산성은 골재의 입경이 작을수록 석분의 혼입량이 많을수록 크게 나타났으며, 공극율과 투수량은 작게 나타났다. 강도는 중성화 처리 유무에 따라 4∼5% 정도의 미소한 차이가 나타났다. 알카리 농도는 중성화 약품처리, 수중용출, 야외폭로 순으로 효과가 크게 나타났으며, 이는 식생블럭의 중성화 방법 선택에 매우 중요한 내용이라 할 수 있다. 또한, 식생상태는 공극율과 골재의 입경이 큰 식생블럭이 생육에 유리한 것으로 나타났다. This study was performed to develop the environment-friendly plantable block and to evaluate unit weight, void ratio, permeability, strength, acid-resistance and value of pH by the change of the grading of waste stone and the addition amount of stone dust. The unit weight, strength, acid-resistance is increased with small size of waste stone with increase of the addition amount of stone dust. But, the void ratio and permeability is decreased. The strength of neutral plantable block is decreased approximately 4-5% than that of the normal plantable block. The decreased effect of pH increased in order to neutral treatment, underwater leaching and field exposure. It is very important contents in neutral method selection of plantable block. Also, the planting state is grown rapidly with increase of the void ratio and of the waste stone size, approximately.

Characteristics of Fracture Energy on Steel Fiber-Reinforced Lightweight Polymer Concrete

( Youn Joon-no ),( Sung Chan-yong ) 한국농공학회 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.7

In this study, unsaturated polyester resin, artificial lightweight coarse aggregate, artificial lightweight fine aggregate, heavy calcium carbonate and steel fiber were used to produce a steel fiber-reinforced lightweight polymer concrete with which mechanical properties were examined. Results of this experimental study showed that the flexural strength of unnotched steel fiber-reinforced lightweight polymer concrete increased from 8.61 to 13.96 MPa when mixing ratio of fiber content increased from 0 to 1.5%. Stress intensity factors(K_IC) increased with increasing fiber content ratio while it did not increase with increasing notch ratio. Energy release rate (G_IC) turned out to depend upon the notch size, and it increased with increasing steel fiber content.

섬유보강 재생 경량폴리머 콘크리트의 공학적 특성

윤준노 ( Youn Joon No ),성찬용 ( Sung Chan Yong ),김영익 ( Kim Young Ik ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-

Recently, with the rapid development of super high building and larger span concrete structure. Polymer concrete can make lightweight and high strength, and use of fiber is required to improve toughness. This study is performed to examine mechanical properties of polypropylene fiber reinforced recycled lightweight polymer concrete(PLPC) and steel fiber reinforced recycled lightweight polymer concrete(SLPC) for fiber content. The tests are carried out at 20±1℃ and 60±2% relative humidity. At 7 days of curing, their unit weight, compressive strength, flexural strength and pulse velocity ranged between 1.848~1.972kg/㎥, 40.13~52.75MPa, 14.25~18.10MPa and 3,380~3,560m/s, respectively.

식생블럭의 물리ㆍ역학적 특성

윤준노 ( Youn Joon No ),노경희 ( Noh Kyung Hee ),남기성 ( Nam Ki Sung ),성찬용 ( Sung Chan Yong ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-

This study is performed to examine the development of the plantable concrete using excellent soil compound, crushed stone, stone dust and superplasticizer. The following conclusions are drawn ; The void ratio is in the range of 25.10-31.40% and the compressive strength is in the range of 69-113kgf/cm² at the curing age 28days, respectively. The plant length was showed higher block by 10% stone dust than 20%.

황토모르터르의 비파괴 특성

윤준노 ( Youn Joon-no ),성찬용 ( Sung Chan-yong ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-

This study is performed to examine the non-destruction properties of the Hwangtoh mortar. The absorption ratio is in the range of 8.25% ~ 18.16%, it tend to increase with increase using the stone dust and Hwangtoh. The pulse velocity and dynamic modulus at the curing age 7 and 28days are in the range of 2,290m/s ~ 4,140m/s, 2,976m/s ~ 4,219m/s and 105×10³kgf/㎠ ~ 293×10³kgf/㎠, 137×10³kgf/㎠ ~ 318×10³kgf/㎠, respectively. They tend to decrease with increase using the stone dust and Hwangtoh.

강섬유보강 경량폴리머 콘크리트의 변형 특성

윤준노 ( Youn Joon-no ),성찬용 ( Sung Chan-yong ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-

Lightweight polymer concrete with steel fiber can be used for thin panel, high building and large span structures due to its may advantages such as its durability, low weight, control of crack propagation, high strength and toughness. This study experimented about steel fiber reinforcement of lightweight polymer concrete using synthetic lightweight aggregate. The test result shows that the maximum strain and elastic modulus are in the range of 0.012 -0.014 and 50.2 x 10³~51.0 X 10³ kgf/cm², respectively. The flexural load-deflection curves after maximum load are shown in smoothly with increase of steel fiber content