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유기 전계 발광 소자(OELD) 개발을 위한 PVK 박막의 특성 연구
河潤卿,魯碩源 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1
Organic-based electroluminescent devices have attracted lots of interests because of their possible applications as large-area flat panel display. The devices that were used in this study were fabricated with poly(9-vinylcarbazole)(PVK) of two different molecular weights. The molecular weights of PVK for the devices were 58,600 and 1,100,000. UV/vis absorption peaks of both PVK films appeared at 296, 330,344nm. PL spectra and EL spectra of both PVK films showed the same pattern around 420nm. Thickness of both PVK films was determinad. For both PVK films, as increased coating rpm, thickness decreased. The film thickness decreased exponentially. Thickness of 1,100,000 PVK was higher than that of 58,600 PVK.
河潤卿,魯碩原 弘益大學校 科學技術硏究所 1999 科學技術硏究論文集 Vol.10 No.1
2,4,6-Triphenyl-1,3,5-Triazine (TRZ) has been used as a hole blocking material for electroluminescent device(ELD)[4]. The EL devices of the four layer structure, ITO/hole transporting layer(HTL)/emitting layer/Al, were fabricated. TRZ was doped into the poly(n-vinylcarbazole)(PVK), which was spin-coated on indium tin oxide(ITO) film. The emitting layer, tris(8-hydroxyquinoline)aluminum(Alq₃), was deposited on top of PVK film. The ELD emits characteristic green color generated from Alq3 emitting layer. As the percentage of TRZ was increased, the efficiency of devices increased. The devices, which contained higher concentration of blocking material, were driven at a lower current under the same voltage. The optimum concentration of hole blocking material was 10wt%, which produced the highest ELD luminescence.
Soybean growth and yield response to elevated temperature and light intensity
Young-Son Cho,Sok-Dong Kim,Bon-Chul Koo,Won-Ha Yang,Jin-Chul Shin,Young-Han Yun1,Joung-Gon Kim 한국작물학회 2008 한국작물학회 학술발표대회 논문집 Vol.2008 No.10
Changing climate could be effect on the growth of soybean and seed yield, so we evaluated newly developed soy cultivars in the point of the physiological characteristics by changing temperature and light intensity in the phytotron. Two soy cultivars evaluated in three temperature levels (T1, 20/15; T2, 25/20; T3, 30/25oC at day/night) the pot experiment in phytotron between winter and spring in 2006 and spring and summer in 2007. Increased temperature from T1 to T2 and T2 to T3 enhanced crop growth parameters greatly and shortened growth duration and increased seed yield, however, grown in winter and spring enhanced too much plant height, so plant stems were very slim and weak and it resulted in the lodging problem. In this results we can estimate warming in Korean peninsular which might be increase temperature with low light intensity, so plant breeders and physiologists should be develop improved lodging resistance cultivars under low light intensity and high temperature.
Ha, Yun-Sok,Kang, Dong Il,Kim, Jeong Hyun,Joung, Jae Young,Yu, Jihyeong,Parihar, Jaspreet S,Salmasi, Amirali Hassanzadeh,Horie, Shigeo,Kim, Wun-Jae,Yi Kim, Isaac Rodar Pub 2014 The Canadian journal of urology Vol.21 No.3
<P>Positive surgical margin (PSM) has classically been associated with biochemical recurrence (BCR) following radical prostatectomy (RP) and immediate adjuvant radiotherapy has been advocated based on two large randomized prospective clinical studies. However, a significant percentage of patients with PSM never experience BCR. This study evaluated factors potentially affecting risk of BCR among the patients with PSM after robot-assisted radical prostatectomy (RARP).</P>
Yun Sok Ha,Chang Doo Jang,Jong Tae Kim,Hyung Suk Mun 한국정밀공학회 2007 International Journal of Precision Engineering and Vol.8 No.4
An analytical method to predict the post-weld deformation at the heat-affected zone (HAZ.) is presented in this paper. The method was based on the assumption that the post-weld deformation is caused by external forces resulting from the inherent strain, which is defined as the irrecoverable strain after removing structural restraints and loadings. In general, the equivalent loading method can be used to analyze distortions in welding areas because it is efficient and effective. However, if additional loads are applied after welding, it is difficult to determine the final strain on a welded structure. To determine the final strain of a welded structure at the HAZ. more accurately, we developed a modified equivalent loading method based on the inherent strain that incorporated hardening effects. The proposed method was applied to calculate the residual stress at the HAZ. Experiments were also conducted on welded plates to evaluate the validity of the proposed method.
Thermal distortion analysis method for TMCP steel structures using shell element
Ha, Yun-sok,Rajesh, S.R. The Society of Naval Architects of Korea 2009 International Journal of Naval Architecture and Oc Vol.1 No.2
As ships become larger, thicker and higher tensile steel plate are used in shipyard. Though special chemical compositions are required for high-tensile steels, recently they are made by the TMCP (Thermo-Mechanical control process) methodology. The increased Yield / Tensile strength of TMCP steels compared to the normalized steel of same composition are induced by suppressing the formation of Ferrite and Pearlite in favor of strong and tough Bainite while being transformed from Austenite. But this Bainite phase could be vanished by another additional thermal cycle like welding and heating. As thermal deformations are deeply related by yield stress of material, the study for prediction of plate deformation by heating should niflect the principle of TMCP steels. The present study is related to the development of an algorithm which could calculate inherent strain. In this algorithm, not only the mechanical principles of thermal deformations, but also the initial portion of Bainite is considered when calculating inherent strain. Distortion analysis results by these values showed good agreements with experimental results for normalized steels and TMCP steels during welding and heating. This algorithm has also been used to create an inherent strain database of steels in Class rule.
Ha, Yun-Sok,Jang, Chang-Doo,Kim, Jong-Tae,Mun, Hyung-Suk Korean Society for Precision Engineering 2007 International Journal of Precision Engineering and Vol.8 No.4
An analytical method to predict the post-weld deformation at the heat-affected zone (HAZ) is presented in this paper. The method was based on the assumption that the post-weld deformation is caused by external forces resulting from the inherent strain, which is defined as the irrecoverable strain after removing structural restraints and loadings. In general, the equivalent loading method can be used to analyze distortions in welding areas because it is efficient and effective. However, if additional loads are applied after welding, it is difficult to determine the final strain on a welded structure. To determine the final strain of a welded structure at the HAZ more accurately, we developed a modified equivalent loading method based on the inherent strain that incorporated hardening effects. The proposed method was applied to calculate the residual stress at the HAZ. Experiments were also conducted on welded plates to evaluate the validity of the proposed method.
Ha Yun-Sok,Kim So-Young,Chung Jae Il,Choi Hoon,Kim Jae Heon,Yu Ho Song,Cho In-Chang,Kim Hyung Joon,Chung Hyun Chul,Koh Jun Sung,Lee Ji Youl,박동진,Kim Hyun Tae,Yoo Eun Sang,Kwon Tae Gyun,Min Kyungchan,Ki 대한남성과학회 2021 The World Journal of Men's Health Vol.39 No.1
Purpose: The purpose of this study was to evaluate end-of-life resource utilization and costs for prostate cancer patients during the last year of life in Korea. Materials and Methods: The study used the National Health Information Database (NHIS-2017-4-031) of the Korean National Health Insurance Service. Healthcare claim data for the years 2002 through 2015 were collected from the Korean National Health Insurance System. Among 83,173 prostate cancer patients, we enrolled 18,419 after excluding 1,082 who never claimed for the last year of life. Results: From 2006 to 2015, there was a 3.2-fold increase the total number of prostate cancer decedents. The average cost of care during the last year of life increased over the 10-year period, from 14,420,000 Korean won to 20,300,000 Korean won, regardless of survival time. The cost of major treatments and medications, other than analgesics, was relatively high. Radiologic tests, opioids, pain control, and rehabilitation costs were relatively low. Multiple regression analysis identified age and living in rural area as negatively associated with prostate cancer care costs, whereas income level and a higher number of comorbidities were positively associated. Conclusions: Expenditure of prostate cancer care during the last year of life varied according to patient characteristics. Average costs increased every year. However, the results suggest underutilization of support services, likely due to lack of alternative accommodation for terminal prostate cancer patients. Further examination of patterns of utilization of healthcare resources will allow policymakers to take a better approach to reducing the burden of prostate cancer care.