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매복 하악 제3대구치의 외과적 발거에 영향을 미치는 방사선학적 변수
김동현,박성빈,장익준,송재철,진병로 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.3
Purpose : The purpose of this study was to determine radiologic variables affecting extraction of impacted mandibular third molar. Materials and Methods : This study was investigated on 44 consecutive extractions of unilateral impacted mandibular third molars (Male;34, Female;10, Mean age;24.98, Age range;19-35). Fourteen radiologic variables, which were actual value except only one, were evaluated to establish their relation to the operation time. The Pearson correlation coefficient and Stepwise procedures for regression analysis were carried out. Results : Eight variables (depth, angulation, ramus width, relationship to the second molar, distal ramus depth, mesial ramus depth, mesial periodontal ligament width and follicle) showed a statistically significant relation to the operation time(Pearson correlation coefficient, p<0.05) . Two variables, depth and mesial periodontal ligament width, showed the most powerful and just relation to the operation time(r2 = 0.349, p<0.05). Conclusion : This study shows that our results can help general practioner to estimate the operation time of extraction of impacted mandibular third molars by measuring two radiologic variables ; depth and mesial periondontal ligament width.
Effect of osmotic pressure on paclitaxel production in suspension cell cultures of Taxus chinensis
Kim, Sang-Ic,Choi, Hyung-Kyoon,Kim, Jin-Hyun,Lee, Hyun-Soo,Hong, Seung-Suh 공주대학교 자원재활용 신소재 연구센터 2002 센터사업 성과집 Vol.- No.1
The effect of osmotic pressure on paclitaxel production was investigated in the suspension cell cultures of Taxus chinensis. Paclitaxel production was definitely influenced by the initial sucrose concentration and the highest production yield was achieved at the concentration of 60 g·l^-1 sucrose(300 mOsm·kg^-1). HIgh osmotic pressure conditions generated by non-metabolic sugar (mannitol and sorbitol) also enhanced paclitaxel production by about two-fold. Kinetic studies revealed that high intial osmotic pressure enhanced paclitaxel production and that high concentration of sucrose was effective for sustaining secondary metabolism after induction of paclitaxel biosynthesis. Stoichiometric analysis with different combinations of sucrose and mannitol confirmed that osmotic pressure was the more important factor for enhancing paclitaxel metabolism. The addition of non-sugar osmotic agent, PEG also enhanced paclitaxle production. In this paper, we showed that high osmotic pressure led to increases in paclitaxel production and proposed that regulation of osmotic pressure may be useful in controlling paclitaxel production.
조성실(Sung-Sil Cho),유재성(Jae-Seong Yu),김진만(Jin-Man Kim),홍익표(Ic-Pyo Hong) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.2
In this paper, we studied the electromagnetic transmission characteristics of eco-friendly foamed concrete which is lightweight, heat and sound insulation, which can reduce the economical cost and environmental pollution. The foamed concretes were fabricated with ladle furnace slag, gypsum and blast furnace slag which are industrial by-products. Electrical properties like dielectric constant and loss tangent were measured to simulate the electromagnetic transmission characteristics of the fabricated foamed concrete walls. The free-space measurement method was used to measure and analyze the electromagnetic transmission characteristics of 1~8GHz band depending on the content of foams and blast furnace slag. From the measurement results, it was confirmed that the electromagnetic wave was transmitted at -10dB(90%) at 4GHz or less. The results of this study can be applied to the research for improving the spectral efficiency through the efficient wireless network design and reducing the human body effect by electromagnetic waves in the indoor space where foamed concrete is applied.
드론의 통신 신호 분석을 위한 단계적 RF 측정 시나리오
김성건(Sung-Geon Kim),노영훈(Yeong-Hoon Noh),홍익표(Ic-Pyo Hong),육종관(Jong-Gwan Yook) 한국전자파학회 2021 한국전자파학회논문지 Vol.32 No.4
드론의 활용도가 높아짐에 따라, 드론의 통신 신호에 대한 정확한 측정 및 분석의 필요성이 강조되고 있다. 하지만 드론의 통신 신호를 분석할 때, 일반적인 스펙트럼 분석은 드론의 통신 신호가 갖는 과도 신호의 특성을 충분히 반영하지 못하여 유의미한 분석에 한계가 있다. 본 논문에서는 드론의 통신 신호가 갖는 과도 신호의 특성을 바탕으로 단시간 푸리에 변환을 이용한 분석의 필요성을 제시한다. 이를 바탕으로, 드론의 통신 신호 분석을 위한 단계적 RF 측정 시나리오를 제안하고, 서로 다른 두 드론에 대해 측정을 진행하여 제안하는 시나리오를 검증하였다. As the utilization of drones increases, the need for accurate measurement and analysis of communication signals from drones is emphasized. However, when analyzing the communication signals of a drone, conventional spectrum analysis cannot fully reflect the transient characteristics of communication signals from drones: This limits the significance of the analysis. In this paper, we present the need for analysis using a short-time Fourier transform based on the transient characteristics of the communication signals from drones. On this basis, we propose a stepwise RF measurement method for the analysis of communication signals from drones and present the validation of the proposed method with measurements on two different drones.