$CaF_2$ 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; $$E/mV=56.795log[\%Al]+1881.7\;R=0.9704$$,$$0.026wt\%{\leq}[\%Al]{\leq}0.984wt\%$$

Pyrazine 이 첨가된 TMAH / IPA 이방성 식각특성

박진성,정귀상 ( Jin Sung Park,Gwty Sang Chung ) 한국전기전자재료학회 1997 한국전기전자재료학회 춘계학술대회논문집 Vol.1997 No.0

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.

소장 폐색이 동반된 모발석증 1예

박진성,김홍주,정주영,Park, Jin-Sung,Kim, Hong-Joo,Chung, Ju-Young 대한소아소화기영양학회 2009 Pediatric gastroenterology, hepatology & nutrition Vol.12 No.2

위석은 위장관계에 흡수되지 않는 이물질들이 축적, 응고되어 점점 그 크기가 증가하여 덩어리를 이룬 것을 말하며, 위장관계 폐색을 일으키거나, 진단이 늦어져 만성 복통의 원인이 되기도 한다. 그 중 모발석의 경우는 발모벽과 모식증의 과거력이 흔히 동반된다. 저자들은 담즙성 구토와 복부 산통 때문에 방문한 8세 여아에서 진단된 소장의 모발석 1예를 경험하여 문헌 고찰과 함께 보고한다. Trichobezoars are commonly found within the stomach, but rarely induce small bowel obstruction. We report an 8-year-old girl who presented with bilious vomiting and colicky abdominal pain. She had a history of depression and trichophagia. A diagnosis of small bowel obstruction was made on computed tomography and a trichobezoar in the ileum was evacuated by exploratory laparatomy.

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

LED 조명 모듈 표면의 방사율 측정에 관한 연구

박진성,허창수,Park, Jin-Sung,Huh, Chang-Su 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.6

LED lighting is sensitive because it made by semiconductor. So it has been researched about radiation of heat technologies for a long time. In addition, measurement and assessment a radiation of heat also conducted. It is necessary to get a date of accuracy temperature on the board after LED driven for measuring Junction temperature of the LED Lighting. For this research, we use 5 chip which is 4 W power on top of LED lighting board made by aluminum. Thermal camera effects to emissivity depending on material and property of the surface in LED board because it determines thermal energy which emitted from material surface. it is not only thermal camera has not a standard about emissivity. It has an error of temperature when emissivity was measured by thermal camera. we confirmed that emissivity and reflected temperature depending on color and quality of the surface throughout experiment.

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.

불로환(不老丸)을 투여한 흰쥐 뇌의 항산화효과에 관한 연구

박진성,고성규,이선동,Park Jin-Sung,Goh Seong-Kyu,Lee Sun-Dong 대한예방한의학회 2001 대한예방한의학회지 Vol.5 No.1

Objectives: Resently Oxidative stress of brain was proved the cause of Alzheimer and stroke sequel. It has important significance in prevention and treatment of cerebropathia that Bulnohwan used as formula of senescence delay have antioxidative effect. The purposes of this study is to investigate the effect of Bulnohwan on antioxidant defense systems such as thiobarbituric acid reactive substances(TBARS), Superoxide dismutase (SOD), Catalase (CAT), Glutathione peroxidase (GSH-PX), Glutathione S-transperase (GST), Glutathione (GSH) in rat brain. Method: Sprague - Dawley rats were divided into 3 groups; saline solution administered control group, Bulnohwan extract administered Experimental group I and Bulnohwan adminisrtrated, 40% dietary restricted Experimental group II. Animals were sacrificed at 12 weeks after treatment TBARS, SOD, CAT, GSH-PX, GST and GSH were measured in mts brain. Results: weight of brain was no stastical significance.(p>0.05) TBARS contents were significant decrease in Experimental group I, II. (p<0.001) SOD activity was stastical significance in Experimental group II, whereas it was no stastical significance Experimental group II.(p<0.0001) Catalase activites were significant increase in . (p<0.00l) Glutathione Peroxidase activites were significant increase in Experimental group I,II. (p<0.000l) Glutathione S-transferase activites were significant increase in Experimental group I, II. (p<0.000) However there were no statistical significance each other. Glutathione contents were significant increase in Experimental group I, II. (p<0.00l) Conclusions: According to the above results, it is considered that Bulohwan has antioxidants effect in rat brain. When Bulohwan goes with diet restriction, there has more Antioxidants effect in rat brain. but this study was perfored retrospectively. So more prospective studies about mutual relation of drugs are needed

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.

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.