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알루미늄 기지에 알루미늄-알루미나 혼합분말을 이용한 고온플라즈마 열분사 코팅층의 밀착강도 향상기구
박진수,이효룡,이범호,박준식,Park, Jin Soo,Lee, Hyo Ryong,Lee, Beom Ho,Park, Joon Sik 한국재료학회 2015 한국재료학회지 Vol.25 No.5
본 연구에서는 손상된 알루미늄 금형의 복원을 위해 고온플라즈마 용사법을 이용하여 금형의 표면에 $Al/Al_2O_3$ 혼합분말을 용사한 후 코팅층과 모재의 증착강도에 대한 평가를 수행하였다. 증착강도의 평가는 분사노즐의 이동속도, 순수한 알루미늄 bond coat 층의 유무에 따라 평가되었으며, bond coat 층을 생성시키지 않았을 때, 코팅층의 두께는 열팽창에 의한 잔류인장응력의 감소를 위해 두껍지 않아야 하지만 일정두께 이상이 되어야 최대의 증착강도를 얻을 수 있음이 나타났다. 또한 순수한 알루미늄 bond coat 층은 내부 결함이 없는 응고된 금속이기 때문에 두께에 따른 증착강도의 영향을 그대로 받아 두께가 두꺼울수록 bond coat 층을 생성시키지 않은 시험편보다 증착강도가 매우 낮게 측정되었다. 반면, 가장 얇게 bond coating 된 시험편 Bc3(3회의 bond coating층과 분사건의 이동속도가 20 cm/sec인 시험편) 는 bond coating을 하지 않은 시험편 중 가장 높은 증착강도를 가지는 시험편 Wbc20(bond coating층이 없고 분사건의 이동속도가 20 cm/sec인 시험편)보다 약 2배 이상증착강도가 향상되었다. 따라서 금형의 복원시에 중간층의 형성이 반드시 필요하며, 이는 코팅층의 잔류 인장응력을 보완시키며 고인성의 순수한 알루미늄과 같은 코팅층과 유사한 층을 코팅하는 것이 필요한 것으로 사료된다. High temperature plasma coating technology has been applied to recover damaged aluminum dies from wear by spraying pure aluminum and alumina powder. However, the coated mixed powder layer composed of aluminum and alumina often undergoes a detachment from the substrate, making the coated substrate die unable to maintain its expected life span. In this study, in order to increase the bonding strength between the substrate and the coating layer, a pure aluminum layer was applied as an intermediate bond layer. In order to prepare the specimen with variable bond coating conditions, the bond coat layers with a various gun speed from 10 cm/sec to 30 cm/sec were prepared with coating cycle variations ranging from three to nine cycles. The specimen with a bond coat layer coated with a gun speed of 20 cm/sec and three coating cycles exhibited ~13MPa of adhesion strength, while the specimen without a bond coat layer showed ~6 MPa of adhesion strength. The adhesion strength with a variation of bond coat layer thickness is discussed in terms of coating parameters.
박진수,김윤배,윤재욱,김종원,Park, Jin-Soo,Kim, Yun-Bae,Yoon, Jae-Wook,Kim, Jong-Won 한국시뮬레이션학회 2010 한국시뮬레이션학회 논문지 Vol.19 No.4
As a new paradigm called modeling and simulation(M&S) or simulation based acquisition(SBA) has arisen, necessity of applying it to Korea has been increased. Not only rational construction of SBA but development of model which can evaluate driving results and improve relating processes to SBA is needed. Therefore we suggests the framework of capability maturity model for M&S development and SBA. The ultimate purpose of our model is improving processes relating to M&S development and SBA. The last section include detailed model which has practices for improving some SBA processes.
박진수,김신도,윤중섭,Park, Jin-Soo,Little, John C.,Kim, Shin-Do,Yun, Joong-Seop 한국환경보건학회 2008 한국환경보건학회지 Vol.34 No.3
Many building materials may contain high concentrations of volatile organic compounds (VOCs) and other hazardous pollutants(HAPs). Specifically, VOCs discharged by indoor building material may cause "new house" syndrome, atopic dermatitis etc. The diffusion coefficient and initially contained total VOC quantity were determined using microbalance experiments and small chamber tests. Interactions between volatile organic compounds (VOCs) and vinyl flooring (VF), a relatively homogenous, diffusion-controlled building material, were characterized. Rapid determination of the material/air partition coefficient (K) and the material-phase diffusion coefficient (D) for each VOC was achieved by placing thin VF slabs in a dynamic microbalance and subjecting them to controlled sorption/desorption cycles. K and D are shown to be independent of concentration for all of the VOCs and water vapor. This approach can be applied to other diffusion-controlled materials and should facilitate the prediction of their source/sink behavior using physically-based models.
최진수 ( Jin Soo Choi ),박진수 ( Jin Soo Park ),안준영 ( Joon Young Ahn ),오준 ( Jun Oh ),손정석 ( Jung Suk Son ),김현재 ( Hyun Jae Kim ),성민영 ( Min Young Sung ),이용환 ( Yong Hwan Lee ),이상덕 ( Sang Deok Lee ),홍유덕 ( You De 한국환경분석학회 2015 환경분석과 독성보건 Vol.18 No.1
We looked into the characteristics and long term variations of chemicals affecting the acidity of precipitation. To this end, we analyzed the data collected at three acid deposition monitoring sites for the period from 1999 to 2013. Three monitoring sites include Seoul, Taean, and Jeju island. Required parameters such as pH, electric conductivity(EC), and concentrations of eight major ionic species were measured. In order to assure accuracy and precision of the data, values of measured electric conductivity were compared against values of calculated electric conductivity. Moreover, comparison between and was made in accordance with EANET°Øs QA/QC method to assure data reliability. During the monitoring period, the deposition was slightly acidic with pH value ranging between 4.6 and 4.9. Precipitation with pH 4.1 to 4.5 was most frequently observed with occurrence frequency of 27%. The analysis of seasonal variations of atmospheric concentration of pH showed that pH level was highest in spring season due to the influx of yellow sand and high pH levels in soils. The study also found that pH levels of samples collected at Seoul and Taean monitoring sites were lowest in autumn. On the other hand, pH level in Jeju was lowest in winter season. Increase in concentrations of NO3 - in precipitation was commonly observed at three monitoring sites. The concentrations of NO3- and NH4 + which affect the acidity of precipitation at Seoul and Taean monitoring sites showed increasing trend.
외상 후 발생한 무지의 수근중수관절의 불안정성에 대한 인대 재건술
박진수(Jin Soo Park),김홍균(Hong Kyun Kim),정영기(Young Khee Jung),유정한(Jung Han Yoo),권인협(In Hyup Kwon),나중호(Jungho Rah) 대한정형외과학회 2008 대한정형외과학회지 Vol.43 No.1
무지 수근중수관절 외상 후 관절염의 소견없이 불안정성을 보이는 경우 요수근굴건을 이용한 Eaton과 Little의 인대 재건술을 시행할 수 있다고 알려져 있으며, 이 치료방법은 심부전방경사인대의 재건을 목적으로 하는 방법으로 최근에 심부전방경사인대 외에도 요배측 인대가 관절의 안정성에 중요한 역할을 하는 것으로 밝혀지고 있어 이에 저자들은 무지 수근중수관절의 불안정성을 보이는 3예를 치료하여 이를 보고하고자 한다. Eaton and Littler's ligament reconstruction is used to treat carpometacarpal instability of the thumb using the flexor carpi radialis tendon. This procedure involves a reconstruction of the deep anterior oblique ligament in patients with post-traumatic prearthritic unstable joints. According to a recent paper, the dorsoradial ligament as well as the deep anterior oblique ligament plays an important role in stabilizing the trapeziometacarpal joint. We report three cases of post-traumatic instability in a prearthritic thumb that was treated with Eaton and Littler's reconstruction using the flexor carpi radialis tendon.