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이정일,임재훈,이창홍,민영일,유지홍,임규성 대한소화기내시경학회 1981 Clinical Endoscopy Vol.1 No.1
We analyzed ERCP findings of 15 patients with clonorchiasis, that were confirmed by stool examination and operation from May, 1976 to September, 1980. The results were as follows. 1) Filling defects due to adult worm of clonorchis sinensis were significant direct findings of clonorchiasis. 2) Irregular stenosis, fuzziness, raggedness, peripheral dilation and disturbance of peripheral filling of intrahepatic bile ducts were significant indirect findings of clonorchiasis. 3) ERCP was excellent method to evaluate biliary tree in patients with clonorchiasis, who showed obstructive jaundice.
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적층공정법으로 제작된 CoCrMo 합금의 복합열처리 효과
이정일,김형균,정경환,김강민,손용,류정호 한국결정성장학회 2018 한국결정성장학회지 Vol.28 No.6
The CoCrMo as-built alloys prepared by 3D-printing process are studied on tensile strength, wear resistance, crystal structure and microstructure after complex heat-treatment including HIP. In this study, HIP treatment for removing micropores, ambient heat-treatment for formation of metal carbides, and solution heat-treatment for homogenization of the created metal carbides were tried and characterized for applying to artificial joint. The complex heat-treatment effects of the CoCrMo as-built alloys prepared by 3D-printing process were owing to the densification during HIP, formation of metal carbides and homogenization of the created metal carbides. The effects of the complex heat-treatment were confirmed by XRD, FE-SEM and EDS.
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기계적 합금법에 의한 Al/graphite 복합체 제조 및 열전도도 특성 분석
이정일,김태완,윤요한,조현수,류정호,Lee, Jung-Il,Kim, Tae Wan,Yoon, Yo Han,Cho, Hyun Su,Ryu, Jeong Ho 한국결정성장학회 2016 한국결정성장학회지 Vol.26 No.4
전자소자내의 방열특성은 제품의 신뢰성을 결정하는 우주 중요한 인자중의 하나이다. 본 연구에서는 Al과 graphite 분말을 기계적 합금법(mechanical alloying)을 이용하여 Al/graphite 복합체 분말을 합성하고, 합성된 분말을 열처리한 시편에 대한 물리적 특성을 분석하였다. 열처리가 완료된 Al/graphite 샘플에서 열처리 온도 및 시간이 증가할수록 $Al_4C_3$ 이차상의 비율이 증가함을 확인하였다. 또한 Al/graphite 샘플의 열전도도는 순수 Al 분말 샘플에 비해 현저히 낮았으나, 열처리 온도와 시간에 비례하여 증가하는 것을 확인하였다.
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이정일 대한안전경영과학회 2012 대한안전경영과학회 학술대회논문집 Vol.2012 No.11
Or maybe moving dangerous goods tanks of motorists excluded from the scope of the supervision of the fire department and fire prevention education as a blind spot on the part of a large party evidence of markers of contamination loading of dangerous goods according to the type of education that can be handled only by preparing the institutional arrangements accident is blocking the moving path of Dangerous Goods moving tanks and loading dangerous goods on fire budget move the path that corresponds to the report received by securing the extinguishing agent is required to neutralize the ash and fire suppression and repression through skills training from large disasters in advance blocking devices should prepare that will
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(Ce<sub>x</sub>Lu<sub>1-x</sub>)<sub>3</sub>MgAl<sub>3</sub>SiO<sub>12</sub> 황색 형광체의 광학적 특성
이정일,김태완,오호라,홍창우,류정호,Lee, Jung-Il,Kim, Tae Wan,Oh, Ho Ra,Hong, Chang Woo,Ryu, Jeong Ho 한국결정성장학회 2016 한국결정성장학회지 Vol.26 No.1
A novel $Ce^{3+}$ doped $(Ce_xLu_{1-x})_3MgAl_3SiO_{12}$ phosphor was successfully synthesized by a conventional solid-state reaction. Heat-treatment temperature was controlled from 1250 to $1550^{\circ}C$ for 5 h. XRD and PL properties were analyzed for the optimum heat-treatment condition. Ce doping concentration was varied from 2.0 to 10.0 mol% for the optimum Ce doping concentration. The PL intensity, peak wavelength and FWHM were calculated with the Ce doping concentration, and evaluated for the application to LED packaging. Particle size and morphology were also characterized for synthesized phosphor sample at optimum heat-temperature and Ce doping concentration.
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이정일,민성욱,류정호,Lee, Jung-Il,Mhin, Sungwook,Ryu, Jeong Ho 한국결정성장학회 2015 한국결정성장학회지 Vol.25 No.5
This study was performed to investigate crystal structure of cubic spinel-type monophase oxide composed of the Mn-Co-Ni ternary system. Starting material was prepared by mixing Mn, Co, Ni oxides then evaporation to dryness. The XRD patterns were analyzed by in-situ XRD as increasing temperature from room temperature to $1400^{\circ}C$ in air atmosphere. The cubic spinel phase was existed in a temperature range from $900^{\circ}C$. However, separation of NiO phase was detected from $1300^{\circ}C$, which was the origin of deterioration in the crytallinity. The surface morphology of the manufactured NTC thermistors were analyzed by FE-SEM for comparison of good and bad samples.
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이정일,김태완,신지영,류정호,Lee, Jung-Il,Kim, Tae Wan,Shin, Ji Young,Ryu, Jeong Ho 한국결정성장학회 2015 한국결정성장학회지 Vol.25 No.2
Mn-Co-Ni oxide system has been used as the NTC thermistors for normal temperature applications. Mn-Co-Ni oxide-based thermistors were sintered at different temperatures for a constant processing time from 900 to $1300^{\circ}C$ for 3 h. The crystal structure, bulk density, microstructure and chemical composition were characterized by XRD, FE-SEM and WD-XRF. The plot of the resistance versus measuring temperature was characterized for the sintered sample at the $1250^{\circ}C$. Moreover, the relationship between log resistivity and reciprocal of absolute temperature of the NTC thermistor was investigated.
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