식각된 비 귀금속 합금과 법랑질간의 접착 인장강도에 대한 연구

박상원,양홍서,Park, Sang-Won,Yang, Hong-So 대한치과보철학회 1987 대한치과보철학회지 Vol.25 No.1

The purpose f this study was to evaluate the effect of resin film thickness on the tensile bond strength and to compare the tensile bond strengths of 4 differently treated metal surfaces. For the experiment, seventy metal specimens were cast with Verabond and divided into I, II, III, groups. The metal specimens in group I were electrolytically etched and cemented with Panavia under finger pressure. Cement film thickness was regulated with metal spacers. The metal specimens in Group II were treated by 4 methods, such as electrolytic etching method, salt-roughened method, EZ-oxisor method , chemical etching method and cemented with Panavia. In group III, electrolytically etched metal specimens were cemented with Hy-Bond. The etched surface of metal specimens and the cement film thickness were examined under the scanning electron microscope. Results were as follows; 1. The tensile bond strength showed no significant difference between $30{\mu}m,\;80{\mu}m,\;130{\mu}m$ film thicknessspecimens. 2. There was no significant difference in the tensile bond strength between the 4 differently treated metal specimens. 3. The tensile bond strength showed significant difference between Panavia and Hy-Bond. 4. Scanning electron microscope photograph revealed that tile interdendritic eutectic was removed in electrolytically etched metal surfaces hilt even dendritic arm was removed in Chemically etched metal surfaces. 5. The metal surfaces which were air-abraded with $50{\mu}m$ aluminum oxide showed roughness and small crack on scanning electron microscope photograph.

2006대한민국 발명특허대전 시상식 인사말씀

박상원,Park, Sang-Won 한국발명진흥회 2007 發明特許 Vol.32 No.1

DC 스퍼터법과 비대칭 양극성 펄스 스퍼터법으로 제작된 고분자 전해질 연료전지 금속분리판용 CrN 코팅막의 특성 연구

박상원,전성용,Park, Sang-Won,Chun, Sung-Yong 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.6

Nanocrystalline CrN films were deposited on Si (100) substrates by means of asymmetric pulsed DC reactive magnetron sputtering. We investigated the growth behavior, corrosion resistance and mechanical properties of CrN films with a change in the duty cycle and pulse frequency. The grain size of the CrN films decreased from 25.4 nm to 11.2 nm upon a decrease in the duty cycle. The corrosion potentials for the CrN films by DC sputtering was approximately - 0.6 V, and it increased to - 0.3 V in the CrN films which underwent pulsed sputtering. The nanoindentation hardness of the CrN films also increased with a decrease in the duty cycle. This enhancement of the corrosion resistance and mechanical properties of pulsed sputtered CrN films could be attributed to the densification and surface smoothness of the microstructure of the films.

전기장식 수처리장치에 의한 배관의 내구성 향상

박상원,Park, Sang-Won 한국설비기술협회 1996 설비 : 공조ㆍ냉동ㆍ위생 Vol.13 No.5

푸아송 분포를 이용한 해상교통관제 구역 내 선박 상호간 교통위험 상황의 발생 간격 분석에 관한 연구

박상원,박영수,Park, Sang-Won,Park, Young-Soo 해양환경안전학회 2016 해양환경안전학회지 Vol.22 No.5

항만 및 연안의 관제구역 내에서는 VHF를 이용하여 24시간 해상교통관제가 이루어지고 있다. 그러므로 VHF 교신을 분석하면 관제구역 내의 선박 움직임이나 관제사의 관제패턴을 확인할 수 있다. 따라서 본 연구에서는 VHF 교신분석으로 관제사가 관제구역 내 위험상황을 관제하는 간격을 도출하고 관제 가이드라인 및 위험한 상황을 사전에 대비할 수 있는 기초 자료로 제공하고자 한다. 이를 위하여 부산항을 대상으로 7일간 VHF 교신을 청취하고, VTS가 직간접적으로 관제한 선박에 대하여 Park 모델을 이용하여 위험도를 도출하였다. 이를 이용하여 단위시간당 일정 위험도 이상의 선박을 관제하는 빈도확률이 푸아송 분포를 따르고 있음을 확인하였고, 그 결과 VTS가 선박을 직접 관제에 개입할 경우는 3.50시간마다, 특히 주간시간대의 경우 2.85시간마다 관제하는 것으로 분석되었다. 그리고 3.84시간마다 일정 위험도 이상의 선박간의 교신이 있음을 확인하였다. Vessel traffic servies (VTS) control movements in ports and coastal areas 24 hours a day using VHF. Thus, we were able to check ship movements and the patterns followed by VTS officers in VTS areas using VHF communication analysis. This study is intended to identify control intervals for dangerous situations and provide VTS officers with basic data and guidelines to prevent these occurrences in advance. We listened to Busan port's VHF communication for seven days and obtained risk values using the Park model with reference to controlled ships. The probability of a dangerous situation arising under a controller's watch per unit of time was confirmed to follow a Poisson distribution. As a result, for each 3.50 hours that VTS directly controls an area, (and in daytime for each 2.85 hours) a ship communicates in a VTS area every 3.84 hours, and some of there communications exceed certain risk values in VTS areas.

버터플라이 밸브 하류 유동의 안정화에 관한 연구

박상원,이상우,Park, Sang-Won,Lee, Sang-U 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.11

A flow stabilizer, which is made of a honeycomb and three different mesh screens, is located downstream of a butterfly-type valve, for the reduction of flow disturbances behind the valve. Mean flow and turbulence measurements as well as flow visualizations are conducted in the downstream region of the deepens the non-uniformity of the streamwise velocity component and turbulence. The mesh screens considerably reduce the turbulence and enhance the uniformity of mean velocities. The combination of the honeycomb and the three mesh screens results in an efficient reduction in the flow disturbances. In addition, the flow stabilizer proves to have a good performance in the suppression of turbulence at a short distance.

황화철($FeS,\;FeS_{2}$)을 이용한 헥사클로로에탄의 환원적 분해반응과 표면특성에 관한 연구

박상원,김성국,허재은,Park Sang-Won,Kim Sung-Kuk,Heo Jae-Eun 한국지하수토양환경학회 2006 지하수토양환경 Vol.11 No.5

The following results were obtained in the reductive degradation of hexachloroethane (HCA), and surface characteristics by using iron sulfide ($FeS,\;FeS_{2}$) mediators. HCA was degraded to pentachloroethane (PCA), tetrachloroethylene(PCE), trichloroethylene(TCE) and cis-l,2-dichloroethylene (cis-1,2-DCE) by complicated pathways such as hydrogenolysis, dehaloelimination and dehydrohalogenation. FeS had more rapid degradation rates of organic solvent than $FeS_{2}$. In liquidsolid reaction, the reaction rates of organic solvents were investigated to explain surface characteristics of FeS and $FeS_{2}$.. To determine surface characteristics of FeS and $FeS_{2}$, the specific surface area and surface potential of each mineral was determined and the hydrophilic site ($N_{s}$) was calculated. The specific surface area ($107.0470m^{2}/g\;and\;92.6374m^{2}/g$) and the $pH_{ZPC}$ of minerals ($FeS\;PH_{ZPC}=7.42,\;FeS_{2},\;PH_{ZPC}=7.80$) were measured. The results showed that the Ns of FeS and $FeS_{2}$ were $0.053\;site/mm^{2}\;and\;0.205\;site/mm^{2}$, respectively. $FeS_{2}$ had more hydrophilic surface than FeS. In other words, FeS have more hydrophobic surface site than $FeS_{2}$. 본 논문에서는 황화철($FeS,\;FeS_{2}$) 유기 용매의 환원적 분해 반응과의 표면특성의 관계에 대해서 다음과 같은 결과를 얻었다. hexachloroethane(HCA)은 수소첨가반응, 탈염소제거반응과 탈수소탈염소화반응으로 pentachloroethane(PCA), tetrachloroethylene(PCE), trichloroethylene(TCE)와 cis-1,2-dichloroethylene(cis-1,2-DCE)로 분해되었다. FeS와 $FeS_{2}$를 반응 매개물로 HCA에 대한 반응에서 FeS는 $FeS_{2}$보다 분해반응 속도가 빠르게 나타났다. FeS와 $FeS_{2}$의 표면 특성 연구에서 각 광물질에 대한 친수성 표면 자리(Ns)를 정량적으로 계산하기 위해서 비표면적 값($107.0470m^{2}/g$와 $92.6374m^{2}/g$)과 표면 전위를 측정에 측정된 $PH_{ZPC}(FeS,\;PH_{ZPC}=7.42,\;FeS_{2},\;PH_{ZPC}=7.80)$ 값을 이용해서 계산한 결과 FeS와 $FeS_{2}$의 $N_{s}$값은 각각 $0.053\;site/nm^{2},\;0.205\;site/nm^{2}$으로 나타났다. 그리고 0.2 g/L Fe광물질에 대한 실질적인 친수성 표면 농도는 각각 $3.303{\times}10^{-6}\;mol/L$와 $1.102{\times}10^{-5}\;mol/L$ 나타났다. $FeS_{2}$는 FeS에 비해 훨씬 친수성 표면임을 실험 결과 확인하였다. FeS와 $FeS_{2}$의 두 광물질 중에서 유기 용매의 환원 반응 속도는 FeS가 훨씬 빠르게 나타났다.

XML 데이터베이스 지원을 위한 통합 환경

박상원,민경섭,김형주,Park, Sang-Won,Min, Kyung-Sub,Kim, Hyoung-Joo 한국정보과학회 2000 정보과학회 컴퓨팅의 실제 논문지 Vol.15 No.11

웹에서 정보 전달의 수단으로 등장한 XML은 많은 응용 분야에서 사용될 것이다. 많은 양의 XML 문서를 효율적으로 다루기 위하여 데이타베이스의 지원은 필수적이다. 데이터베이스를 이용하여 XML 데이타를 처리할 때 데이타베이스이 종류뿐만 아니라 그 인터페이스도 중요한 문제이다. 본 논문에서는 관계형 데이터베이스, 객체지향형 데이터베이스 및 랩포를 이용하여 XML 데이타를 저장, 질의하며 그 인터페이스로 XML-뷰, ODMG C++바인딩, OQL, DOM을 사용하였다. 또한 각각의 시스템의 구현을 통하여 각 방법들의 장단점을 논하고, 효율적인 XML 문서 처리에 대한 방법을 제시한다. XML will be used in lots of areas in the Web environment as a method of information exchange, We have to use dat'abases to manipulate lots of XML documents efficiently, When we use database to manipulate XML, not only type of database but also its interface is important We develop a system using relational database, object-oriented database and wrapper to store XML data, of which interfaces are XML-View, ODMG C++ binding, OQL and DOM, We discuss pros and cons of each method by the implementation of the system, and propose an efficient manipulation method of XNIL documents.

우울증(憂鬱症)의 구치료(灸治療)에 관(關)한 문헌적(文獻的) 고찰(考察)

박상원,송춘호,Park Sang-Won,Song Choon-Ho 경락경혈학회 2002 Korean Journal of Acupuncture Vol.19 No.1

Objective : This study was undertaken to review the moxa treatment of melancholia. Method : We referred to records from ancient to modern. Results : The results of this study were obtained as follows ; 1. It reveals that the common symptoms of melancholia shows chronic weakness and coldness generally, and moxibustion is effective for making body warm. 2. It reveals that HT8(少府), LR1(大敦), PC7(大陵), ST36(足三里) are used much for the treatment of melancholia, and the common characters of the above points are freshing mind, refreshing chest, controlling digestive energy etc. 3. It reveals that pericardium meridian, liver meridian, heart meridian are used much in moxa treatment of melancholia. Conclusion : These results indicate that moxa treatment is effective to treatment of melancholia.

밸런싱밸브의 종류별 적용특성

박상원,Park, Sang-Won 한국설비기술협회 1994 설비 : 공조ㆍ냉동ㆍ위생 Vol.11 No.2