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Choi, Chang Heon,Park, Jong Min,Park, So-Yeon,Kang, SungHee,Cho, Jin Dong,Kim, Jung-in Korean Society of Medical Physics 2017 의학물리 Vol.28 No.2
This study aims to analyze dose distribution and treatment time of endobronchial brachytherapy (EBBT) by changing the position step size of the dwell position. A solid water phantom and an intraluminal catheter were used in the treatment plan. The treatment plans were generated for 3, 5, 7, and 10 cm treatment lengths, respectively. For each treatment length, the source position step sizes were set as 2.5, 5, and 10 mm. Three reference points were set 1 cm away from the central axis of the catheter, along the axis, for uniform dose distribution. Volumetric dose distribution was calculated to evaluate the dosimetric effect. The total radiation delivery time and total dwell time were estimated for treatment efficiency, which were increased with position step sizes. At half-life time, the differences between the position step sizes in the total radiation delivery time were 18.1, 15.4, 18.0, and 24.0 s for 3, 5, 7, and 10 cm treatment lengths, respectively. The dose distributions were more homogenous by increasing the position step sizes. The dose difference of the reference point was less than 10%. In brachytherapy, this difference can be negligible. For EBBT, the treatment time is the key factor while considering the patient status. To reduce the total treatment time, EBBT can be performed with 2.5 mm position step size.
기술사업화 교육특성에 따른 업무처리 성과의 차이분석 연구
이창원(Chang Won Lee),장성희(Sunghee Jang) 한국인터넷전자상거래학회 2013 인터넷전자상거래연구 Vol.13 No.1
The business circumstances are constantly being changed, and they are difficult to predict. If the company doesn"t have a differentiated core competency, they will have a harder time for surviving. In this global age, technological innovation for a survival strategy of the company is no longer an option. A systematic study in terms of technology commercialization education program is highly needed to strengthen the competitiveness of technology business and pursue technological innovation in global technology convergence age. This study is to explore 1) difference analysis between characteristics variables and job performance and 2) difference analysis by education method, operational methods, and global education experiences. The study shows models results by cross-tabulation analysis, and the suggestions are provided. The study results show statistically significant differences in job performance concerning education method, operational methods, and global education experience. This study will provide the strategic insights for advanced education program and competitive advantage of the company to create technology business eco-system.
KSLV-1 발사를 위한 원격측정신호 Link Margin 분석
오창열(Chang-Yul Oh),이성희(Sunghee Lee),김동현(Donghyun Kim),권순호(Sunho Kwon) 한국항공우주연구원 2009 항공우주기술 Vol.8 No.2
위성발사체(KSLV)발사에 있어서 Telemetry data는 발사임무수행 및 비행안전통제를 위해서 매우 중요한 자료이다. 따라서 발사체의 전체 비행구간 동안에 Telemetry 신호를 안정적으로 수신하는 것은 매우 중요하며, 이를 위하여 우주센터에서는 고흥 센터, 제주추적소 및 해상의 다운레인지를 운용하고 있다. 본 문서에서는 발사임무설계에 따른 예상비행궤적 및 발사체 자세, 추적소 위치를 고려하여 각 추적소의 임무구간에 신호를 안정적으로 수신할 수 있는지를 판단하는 Link Margin 및 통신신뢰도를 분석한다. 보다 정확한 분석을 위해서는 예상비행궤적 및 추적소 위치를 고려하여 발사체기준의 추적소방향(Aspect angle 및 roll angle)에 대한 탑재송신부 유효방사전력(EIRP: Effective Isotropic Radiation Power) 특성을 사용하여야 하나, 본 분석에서는 가용자료의 한계로 95% spatial coverage 유효방사전력을 사용하였다. Telemetry data is very important for the Launch Mission and Flight Safety Control during the Space Launch. In Naro Space Center, several telemetry stations such as a small station in the NARO space center, two stations in Jeju and a downrange station on a ship are deployed for the stable acquisition/receiving of the telemetry signals. In this paper, the Link Margin and Reliability for the telemetry are analyzed to evaluate the probability of the signal receiving of each station. Even though the proper analysis is to using the on-board EIRP(Effective Isotropic Radiation Power) values in the direction of the ground station considering the predicted flight trajectory and the locations of the stations, the global EIRP of 95% spatial coverage has been used for the analysis, due to the limitation of the available data.
Toughening Epoxy Resins with Core—Shell (HTPB-PMMA/PMA) Rubber Particles
Kang, Sunghee,Kim, Daeyeon,Kim, Taehee,Lee, Wonjoo,Kim, Hyeon-Gook,Chung, Jin Suk,Lim, Choong-Sun,Chang, Sang-Mok,Seo, Bongkuk American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>Epoxy resins, which are thermoset polymers, are widely used in coatings and adhesives because of their good heat and chemical resistance, as well as their adhesive strength. However, these polymers are brittle, meaning they have a poor resistance to impact. The brittleness of epoxy resins can be reduced using a variety of toughening agents, such as core-shell particles, polyurethanes, or polyester polymers. In the particular case of core-shell particles, the core part is usually composed of rubber polymers, such as polybutadiene, to improve the impact strength of the epoxy resins; while the shell part is made of glassy polymers, like poly(methylmethacrylate). In this study, core-shell rubber particles (CSRPs) synthesized by emulsion polymerization, were used to improve the physical properties of epoxy resins. Fourier transform infrared spectroscopy (FT-IR) was used to study the structure of the CSRPs. Differential scanning calorimetry (DSC) was conducted to find the glass transition temperature (T-g) of the samples. The morphology of the synthesized CSRPs was analyzed using a scanning electron microscope (SEM) and a transmission electron microscope (TEM). Furthermore, the impact strength of cured epoxy compositions, including that of CSRPs, was measured with an Izod impact tester.</P>