http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
고강도 구조용 철강소재의 대입열 용접 시 열영향부의 조직 미세화 및 기계적 특성 향상에 미치는 TiN 및 B의 효과
박진성,황중기,조재영,한일욱,이만재,김성진,Park, Jin-seong,Hwang, Joong-Ki,Cho, Jae Young,Han, Il Wook,Lee, Man Jae,Kim, Sung Jin 한국재료학회 2019 한국재료학회지 Vol.29 No.2
In the current steel structures of high-rise buildings, high heat input welding techniques are used to improve productivity in the construction industry. Under the high heat input welding, however, the microstructures of the weld metal (WM) and heat-affected zone (HAZ) coarsen, resulting in the deterioration of impact toughness. This study focuses mainly on the effects of fine TiN precipitates dispersed in steel plates and B addition in welding materials on grain refinement of the HAZ microstructure under submerged arc welding (SAW) with a high heat input of 200 kJ/cm. The study reveals that, different from that in conventional steel, the ${\gamma}$ grain coarsening is notably retarded in the coarse grain HAZ (CGHAZ) of a newly developed steel with TiN precipitates below 70 nm in size even under the high heat input welding, and the refinement of HAZ microstructure is confirmed to have improved impact toughness. Furthermore, energy dispersive spectroscopy (EDS) and secondary-ion mass spectrometry (SIMS) analyses demonstrate that B is was identified at the interface of TiN in CGHAZ. It is likely that B atoms in the WM are diffused to CGHAZ and are segregated at the outer part of undissolved TiN, which contributes partly to a further grain refinement, and consequently, improved mechanical properties are achieved.
근시성 맥락막 신생혈관 환자에서 스펙트럼 영역 빛간섭단층촬영으로 측정한 맥락막
박진성,조영욱,장지혜,Jin Sung Park,Young Wook Cho,Ji Hye Jang 대한안과학회 2014 대한안과학회지 Vol.55 No.9
Purpose: Using the spectral domain optical coherence tomography (SD-OCT), we studied the difference in the choroidal morphology between the choroidal neovascularization (CNV) area and the area surrounding CNV. Methods: This retrospective study consisted of 19 patients with myopic CNV lesion in eye; fellow eyes were used as controls. All eyes were analyzed by measuring the choroidal thickness and large choroidal vessel size using SD-OCT. Eyes with CNV were divided into groups; the neovascular lesion was defined as group 1, the surrounding area as group 2. Subfovea of the fellow eye was defined as group 3. Results: The choroidal thickness was 80.00 ± 68.31 in group 1, 63.44 ± 67.75 in group 2 and 71.11 ± 65.69 μm in group 3. There was a significant difference between group 1 and group 2 (<em>p</em> = 0.038). There were no significant differences between group 1 and 3 or between group 2 and 3 (<em>p</em> = 0.365, p = 0.314). The large choroidal vessel size was 57.47 ± 39.78 in group 1, 40.45 ± 34.69 in group 2 and 45.63 ± 37.00 μm in group 3. There was a significant difference between group 1 and group 2 (<em>p</em> = 0.025). There were no significant differences between group 1 and 3 or between group 2 and 3 (<em>p </em>= 0.123, <em>p</em> = 0.325). Conclusions: Choroidal thickness and large choroidal vessel size at the center of the CNV were greater than in the area surrounding CNV. The results suggest that although the CNVs were due to a thinned choroid caused by severe choroidal ischemia, the development of CNV requires maintenance of choriocapillaris and large choroid vessels. J Korean Ophthalmol Soc 2014;55(9):1313-1319
아연 및 알루미늄이 도금된 Hot-Press Forming 강의 염화물 환경 내 전기화학적 부식 및 수소확산거동
박진성,이호종,김성진,Park, Jin-seong,Lee, Ho Jong,Kim, Sung Jin 한국재료학회 2018 한국재료학회지 Vol.28 No.5
Hot-press forming(HPF) steel can be applied successfully to auto parts because of its superior mechanical properties. However, its resistances to aqueous corrosion and the subsequent hydrogen embrittlement(HE) decrease significantly when the steel is exposed to corrosive environments. Considering that the resistances are greatly dependent on the properties of coating materials formed on the steel surface, the characteristics of the corrosion and hydrogen diffusion behaviors regarding the types of coating material should be clearly understood. Electrochemical polarization and impedance measurements reveal a higher corrosion potential and polarization resistance and a lower corrosion current of the Al-coating compared with Zn-coating. Furthermore, it was expected that the diffusion kinetics of the hydrogen atoms would be much slower in the Al-coating, and this would be due mainly to the much lower diffusion coefficient of hydrogen in the Al-coating with a face-centered cubic structure. The superior surface inhibiting effect of the Al-coating, however, is degraded by the formation of local cracks in the coated layer under severe stress conditions, and therefore further study will be necessary to gain a clearer understanding of the effect of cracks formed on the coated layer on the subsequent corrosion and hydrogen diffusion behaviors.
박진성,Park, Jinsung 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.3
In this paper, the effects of phase noise on the radar system were analyzed in terms of 3 point of view. The impact(s) on the compressed pulse waveform, the FMICW(Frequency Modulated Interrupted Continuous Wave) radar performance and the receiver sensitivity were investigated. From the investigation, it was indicated that the phase noise over 10 kHz offset frequency makes the side lobe level of compressed pulse worse. Also it was founded that the FMICW radar performance, especially at the noise level of range profile, is related to the phase noise. Finally, the investigation showed that the phase noise at local oscillator affects the receiver sensitivity.
$\textrm{Li}_2\textrm{ZrO}_3$ 계를 이용한 $\textrm{CO}_2$ 가스 센서
박진성,김시욱,이은구,김재열,이현규,Park, Jin-Seong,Kim, Si-Uk,Lee, Eun-Gu,Kim, Jae-Yeol,Lee, Hyeon-Gyu 한국재료학회 1999 한국재료학회지 Vol.9 No.9
이산화탄소 기체센서를 Li$_2$ZrO$_2$계에서 온도와 $CO_2$농도의 함수로서 연구했다. Li$_2$ZrO$_3$를 열처리해서 합성했다. 시편은 직경 10mm, 두께 1mm의 벌크형과 알루미나 기판 위에 후막형으로 각각 제조했다. Li$_2$ZrO$_3$는 45$0^{\circ}C$에서 $650^{\circ}C$의 온도 범위에서 0.1%에서부터 100%까지 이산화탄소 농도 변화를 감지한다. 이산화탄소 감도는 측정온도와 연관성이 있다. Li$_2$ZrO$_3$는 45$0^{\circ}C$에서 $650^{\circ}C$의 온도 범위에서 $CO_2$와 반응해서 Li$_2$CO$_3$와 ZrO$_2$로 분해된다. $650^{\circ}C$ 이상에서 Li$_2$CO$_3$는 Li$_2$O와 $CO_2$로 재분해된다. Li$_2$ZrO$_3$센서의 재현성은 좋지 않았고, 동작온도는 55$0^{\circ}C$ 정도가 적당하였다. A carbon dioxide gas sensor was studied as a function of temperature and $CO_2$concentration in the Li$_2$ZrO$_3$ system. Lithium zirconate(Li$_2$ZrO$_3$) was synthesized by the heat-treatment of zirconia(ZrO$_2$)and Lithium carbonate(Li$_2$CO$_3$). The specimens were prepared both as bulk disk, 10mm in diameter and 1.0mm thickness, and thick films on an alumina substrate. Lithium zirconate readily responded to $CO_2$concentration from 0.1% to 100% in the range of 45$0^{\circ}C$ to $650^{\circ}C$. The sensitivity to $CO_2$ was dependent on the measuring temperature. Lithium zirconate(Li$_2$ZrO$_3$) decomposes into Li$_2$CO$_3$ and ZrO$_2$after the reaction with $CO_2$in the range of 45$0^{\circ}C$ to $650^{\circ}C$. Li$_2$CO$_3$ changes into Li$_2$O and $CO_2$ above $650^{\circ}C$. The material showed difficulty with reversibility and recovery. The optimum temperature for the highest sensitivity is around 55$0^{\circ}C$.
$N_2$O 분위기에서 RTP로 제조한 실리콘 산화막의 산화 반응
박진성,이우성,심태언,Park, Jin-Seong,Lee, U-Seong,Sim, Tae-Eon 한국재료학회 1993 한국재료학회지 Vol.3 No.1
실리콘 산화막을 $N_2$O 분위기에서 RTP로 제조하여 그 성장 기구를 고찰 했다. 산화막과 기판 실리콘 계면 사이에 질소성분이 포함된 oxynitride층이 존재한다. $N_2$O 기체를 이용한 산화막 성장은 삼화제 확산에 의해 성장이 지배되는 포물선 성장론을 따르고 산화제 확산 억제작용은 실리콘 산화막과 실리콘 기판사이에 존재하는 oxynitride막에서 일어난다. 확산이 산화막 성장을 결정하는 구간에서 포물선 성장율 상수 B의 활성화 에너지는 약 1.5 eV이고 산화막 두께 증가에 따라 증가한다. Abstract Oxidation kinetics of silicon oxide films formed by rapid thermal oxidizing Si substrate in $N_2$O ambient studied. The data on $N_2$0 oxidation shows that the interfacial nitrogen-rich layers results in oxide growth in the parabolic regime by impeding oxidant diffusion to the Si$O_2$-Si interface even for ultrathin oxides. The activation energy of parablic rate constant, B, is about 1.5 eV, and the energy increses with oxide thickness.
스마트폰 시청 시 몸통 교정기 착용에 따른 목, 허리 굽힘-이완 비율, 관절가동범위, 압통, 착용감 변화
박진성,박두진,Park, Jin-Seong,Park, Du-Jin 대한고유수용성신경근촉진법학회 2021 PNF and Movement Vol.19 No.3
Purpose: This study was conducted to investigate changes in the cervical and lumbar flexion-relaxation ratio, range of motion, pressure pain threshold, and perceived comfort following the wearing of a trunk brace during smartphone watching. Methods: To calculate the number of subjects for this study, an analysis with G<sup>*</sup>Power was performed at a statistical power of 0.8, an effect size of 0.5, and a significance level of 0.05, based on the results of a preliminary experiment on five subjects. In total, 27 adult men and women were recruited who had been informed of the study's purpose and process and had agreed to participate. All subjects watched content on a smartphone for 20 minutes in the same posture and conditions while wearing and not wearing a trunk brace, and then their cervical and lumbar flexion-relaxation ratio, range of motion, pressure pain threshold, and perceived comfort were measured. Results: Compared to the non-wearing of a trunk brace, the wearing of a trunk brace resulted in a statistically significant smaller decline in cervical extension and right-side cervical rotation (p<0.05). When the subjects wore a trunk brace, their right- and left-side cervical and right-side lumbar pressure pain statistically significantly improved when compared to not wearing a trunk brace (p<0.05). They also perceived a significantly lowered level of comfort 20 minutes after wearing a trunk brace compared to immediately after wearing it (p<0.05). Conclusion: The trunk brace was effective in reducing declines in right-side cervical rotation and the occurrence of left- and right-side cervical and right-side lumbar pressure pain. The findings indicate the need to improve the perceived comfort of trunk braces.