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역학적 축 선정에 따른 전후면 경골천장각의 단순방사선학적 분석
박진성,정순택,황선철,김동희,곽지용,윤홍권,남대철,Park, Jin-Sung,Jeong, Soon-Taek,Hwang, Sun-Chul,Kim, Dong-Hee,Gwark, Ji-Yong,Yoon, Hong-Kwon,Nam, Dae-Cheol 대한족부족관절학회 2013 대한족부족관절학회지 Vol.17 No.3
Purpose: We investigated a statistical difference of tibial-articular surface (TAS) angles between radiographs of standing ankle anteroposterior (AP) and whole lower extremity view, and evaluated whether the tibial axis obtained from the standing ankle AP view reflects the original mechanical axis of lower extremity. Materials and Methods: Both the standing ankle AP and whole lower extremity view were taken from 60 legs of 30 healthy volunteers without a history of ankle surgery or deformity of lower limb. To determine the tibial axis, Takakura's and Hintermann's method were employed in the standing ankle AP view. To compare these results with the original TAS angle, ANOVA and multiple comparison test were used. Results: The mean TAS angle was 88.3 degrees(from hip joint to ankle), 89.5 degrees (from knee joint to ankle), 88.5 degrees (Takakura's method), and 90.2 degrees(Hintermann's method). Although there was a statistical significance (p=0.000) between these results, Takakura's method had no significant difference, compared to the results of whole extremity view by the multiple comparison test. Conclusion: The tibial axis obtained by Takakura's method reflects the original mechanical axis of lower extremity. When a surgical procedure is planned, however, it is necessary to consider that the ankle radiographs do not provide any information on the proximal deformity without the whole lower extremity view.
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.
$CaF_2$ 기전력법에 의한 용융아연 중 알루미늄 농도의 측정
박진성,김항수,정우광,김종상,Park Jin Sung,Kim Hang Soo,Jung Woo-Gwang,Katayama I.,Kim Jong Sang 한국전기화학회 2000 한국전기화학회지 Vol.3 No.4
용융아연 도금 강판 제조시 용융아연 도금 bath중의 알루미늄 농도를 조절하는 것은 매우 중요하다 본 연구의 목적은 용융아연 도금욕 중 알루미늄 농도를 신속하게 측정할 수 있는 센서 개발을 위한 기초 data를 제공하는 것이다. $CaF_2$고체전해질과 3가지 종류의 참조극을 사용하여 $460^{\circ}C\~500^{\circ}C$의 순수한 용융아연 bath에서 불소포텐샬을 측정하였다. 용융 아연 중 알루미늄의 농도를 측정하기 위하여 다음과 같은 불소 이온 농담전지 센서를 구성하였다. $$(-)W|Zn-Al,\;AlF_3|CaF_2|Bi,BiF_3|W(+)$$ 알루미늄의 농도가 $0.984wt\%$이하인 Zn-Al bath의 온도를 $460\pm10^{\circ}C$로 유지하고 상기의 알루미늄 농도 센서를 이용하여 기전력을 측정하였다. 측정된 기전력 값으로부터 최소 자승 회귀분석법을 이용하여, 다음과 같은 알루미늄 농도와 기전력과의 관계식을 얻었다. $$E/mV=56.795log[\%Al]+1881.7\;R=0.9704$$,$$0.026wt\%{\leq}[\%Al]{\leq}0.984wt\%$$ The control of dissolved aluminum concentration in the hot dip zinc galvanizing bath is greatly important in producing galvannealed steel sheets. The purpose of present study is to provide basic data for measurement of the aluminum concentration in site in hot dip zinc bath at the temperature of $460^{\circ}C\~500^{\circ}C$ using $CaF_2$ solid electrolyte sensor with three kinds of reference electrode. Good workability and stability of the sensor were confirmed with the $Bi+BiF_3$ reference electrode from the emf measurement. In order to measure the aluminum concentration in Zn-Al bath, the galvanic cell of fluorine ion was constructed with $CaF_2$ solid electrolyte as follows; $$(-)W|Zn-Al,\;AlF_3|CaF_2|Bi,BiF_3|W(+)$$. The emf measurement was made at the temperature of $460\pm10^{\circ}C$ in the Zn-Al bath. The following correlationship between aluminum concentration and emf was obtained by the least square regression analysis; $$E/mV=56.795log[\%Al]+1881.7\;R=0.9704$$,$$0.026wt\%{\leq}[\%Al]{\leq}0.984wt\%$$
$\textrm{Li}_2\textrm{ZrO}_3$ 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$0^{\circ}C$.
$\textrm{SiO}_2$를 첨가한 $\textrm{Cr}_2\textrm{O}_3$의 전기전도도
박진성,이은구,이우선,문종하,Park, Jin-Seong,Lee, Eun-Gu,Lee, U-Seon,Mun, Jong-Ha 한국재료학회 1997 한국재료학회지 Vol.7 No.7
SiO$_{2}$를 첨가한 Cr$_{2}$O$_{3}$의 전기전도도와 미세구조를 산소분압, 온도, 그리고 SiO$_{2}$첨가량에 따라 측정하였다. 입자직경은 1$\mu\textrm{m}$보다 작다. 순수한 Cr$_{2}$O$_{3}$의 전기전도도는 산소분압과 온도가 증가함에 따라 증가하였으며 110$0^{\circ}C$부터 진성 영역이 나타났다. Cr$_{2}$O$_{3}$의 전기전도도는 SiO$_{2}$첨가로 감소하지만, 산소분압에 따른 변화는 SiO$_{2}$첨가와 무관하다.
RTP로 $N_2$O 분위기에서 제조한 Oxynitride Gate 절연체의 물질적 전기적 특성
박진성,이우성,심태언,이종길,Park, Jin-Seong,Lee, Woo-Sung,Shim, Tea-Earn,Lee, Jong-Gil 한국재료학회 1992 한국재료학회지 Vol.2 No.4
Si(100) 웨이퍼를 사용하여 RTP 장비에서 $O_2$와 $N_2$O 분위기에서 8nm의 oxynitride를 제조 하였다. 기존의 로(furnace) 열산화막과 비교해서 oxynitride는 I-V, TDDB 특성이 우수하였고, flat-band voltage shift도 적었으며 $BF_2이온$ 주입에 의한 붕소 투과 억제 특성도 우수하다. 유전상수는 oxynitride가 열산화막에 비해서 크다. Oxynitride는 순수한 Si$O_2$유사하게 V 〉${\varphi}_0$ 구간에서 Fowler-Nordheim 터널링 특성을 나타낸다. SIMS, AES, 그리고 XPS 분석 결과 질소 pile-up이 Si$O_2$/Si 계면에서 나타나고, 이것은 oxynitride 산화막 특성 향상과 깊은 관련이 있다. Ultrathin(8nm) oxynitride (SiOxNy) film have been formed on Si(100) by rapid thermal processing(RTP) in $O_2$and $N_2$O as reactants. Compared with conventional furnace $O_2$ oxide, the oxynitride dielectrics shows better characteristics of I-V and TDDB, and less flat-band voltage shift. The oxynitride has a behavior of Fowler-Nordheim tunneling in the region of V 〉${\varphi}_0$ simialr to pure Si$O_2$oxide. The relative dielectric constant of oxynitride is higher than that of conventional pure oxide. Excellent diffusion harrier property to dopant(B$F_2$) is also observed. Nitrogen depth profiles by SIMS, AES, and XPS show nitrogen pile - up at Si$O_2$/Si interface, which can explain the improved properties of oxynitride dielectrics.
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.