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장지근,김민영,장호정,김장기 단국대학교 1997 論文集 Vol.31 No.-
Pt thin films with the thickness of about 3000Å have been deposited on the Ti/SiO_2/Si structures in a variety of process conditions by DC magnetron sputtering method followed by the in-situ annealing at 500℃ for 30 minutes and/or the rapid thermal annealing at 650℃ for 20 seconds. As the result of experiments, only the Pt films deposited at room temperature in the atmosphere of Ar showed the [200] preferred orientation after the in-situ annealing regardless to the following rapid thermal annealing The XRD analysis exhibited the orientation rate of 53% with FWHM of 0.6° for the (200) peak in the in-situ annealed sample deposited at room temperature and Ar ambient showing a little increase of the [200]-orientation rate according to the following rapid thermal annealing. From the SEM micrographs, the as-deposited Pt films was observed after post-annealing.
장지근,김장기,김민영 단국대학교 신소재기술연구소 1991 신소재 Vol.1 No.-
위성전원용 태양전지로 사용할 수 있는 새로운 구조의 FAH-전지로부터 효율파라미터 특성이 입사 광전력의 세기(I=20∼1000 mW/㎠)와 온도 (T=0∼140℃)에 따라 어떻게 변화되는가를 측정하고 이 결과를 분석하였다. 일정한 온도(T=30℃)에서 광세기가 증가할 때 FAH-전지의 개방전압(V_oc)은 20∼200 mW/㎠ 범위에서 v_oc=0.66+0.067·log(I/20) [V]로, 200∼600mW.㎠ 에서는 V-oc=0.727+0.04·log(I/200) [V]의 관계로 증가하는 특성을 나타내고 600 mW/㎠ 이상에서는 0.75 [V]로 포화되었다. 충실도(F·F)는 100mW/㎠ 이하에서 F·F=0.815∼0.0858·log(I/20)으로, 300 mW/㎠이상에서는 F·F=0.65∼0.5164·log(I/300)의 관계로, 광세기에 따라 감소하는 특성을 보였다. T=30℃일 경우 전지의 효유(EFF.)은 100mW/㎠이하의 광세기에서 거의 일정한 값으로 나타나고(EFF.≒EFF_*ref=EFF.|I=100 mW/㎠) 300mW/㎠ 이상의 광세기에서는 EFF.=Eff_*ref·[0.9-0.412·log(I/300)]로 효율이 급격히 저하되었다. 또한 일정한 광세기(I=100 mW/㎠)에서 단락전류(I_se는 온도가 증가함에 따라 단조증가하며 T<30℃에서 dI_se/dT=0.0006 mA/℃로 나타났다. 개방전압의 감소율은 전체 측정온도 범위(T=0∼140℃)에서 dV_oc/dT=-0.002 V/℃로 나타났으며, 충실도(F·F)는 T=0∼20℃, 20∼90℃, 90∼140℃의 각 영역에서 -0.275%/℃, -0.1357%/℃, -0.1 %/℃의 율로 감소하였다. 전지의 효율은 T=30℃의 갑(EFF. |T=30℃=EFF.ref)을 기준할 때 T<20℃에서 EFF.=EFF.ref·[1-0.0034·(T-30)]의 관계로 나타나고 그 이하의 온도에서는 효율이 1.05·EFF.ref의 값으로 포화되는 현상을 보였다. The effect of light intensity(I=20∼1000mW/㎠) and temperature(T=0∼140℃) on the efficiency parameters of a new FAH-solar cell is exeprimentally and theoretically investigated n this paper. Under the constant temperature(T=30℃), the increase of light intensity gives the open circuit voltage(V_oc) varing with the relation of 0.66+0.067·log(I/20) [V] and 0.727+0.04·log[I/200] [V] in each range of I=20∼200[mW/㎠] and I=200∼600[mW/㎠]. The open circuit voltage is, however, nearly saturated to 0.75[V] above 600[mW/㎠]. The fill factor is decreased with the relation of 0.815∼0.0858·log[I/20] below 10[mW/㎠ and 0.65-0.5164·log[I/300] above 300[mW/㎠]. The conversion efficiency(EFF.) shows the constant value of EFF-*ref=EFF.|_I=100mW/㎠ below 100[mW/㎠], but decreases with the relation of EFF.=EFF_*ref·(0.9-0.412·log[I/300]) above 300[mW/㎠]. Under the constant light intensity(i=100mW/㎠), the increase of temperature gives the short circuit current increasing with the rate of dI_sc/dT=0.0225[mA/℃] below 30[℃], and dI_sc/dT=0.006[mA/℃] in the range of 30∼140[℃]. The open circuit voltage is decreased with the rate of dV_oc/dT=-0.002[V/℃] The fill factor is decreased with the rate of -0.275[%/℃], -0.1357[%/℃], and -0.1[%/℃] in the ranges of 0∼20[℃], 20∼90[℃], and 90∼140[℃], respectively. The conversion efficiency is decreased with the relation of EFF.=EFF_*ref'·[1-0.0034·(T-30)] above 20[℃], and saturated to 1.05 EFF_*ref' below 20[℃].
Jang, Kyoung-Soon,Park, Hae-Min,Kim, Yun-Gon,Kim, Byung-Gee,Kim, June-Hyung American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.5
<P>Permethylation is one of the most practical modifications for mass spectrometric analysis of carbohydrates. In this study, we showed a facile platform for the on-line permethylation and analysis of acidic N-glycans using capillary liquid chromatography-electrospray ionization-tandem mass spectrometry to elucidate the N-glycan structures derived from glycoprotein samples. Two capillaries, individually packed with NaOH and C18 powder, were coupled to electrospray ion trap mass spectrometer. Prior to mass spectrometry, oligosaccharides were permethylated in NaOH-packed capillary by methyl iodide, and the permethylated glycans were consequently extracted from residual reagents, such as NaOH and methyl iodide, in C18-capillary, instead of using conventional chloroform extraction. After permethylation and purification, the permethylated glycans were released from C18 capillary by acetonitrile, and sprayed into mass spectrometer. Using this on-line strategy, a picomolar range of sialylated N-glycans from bovine fetuin were analyzed by tandem mass spectrometry.</P>
Uterine serosal ectopic pregnancy: A case report
( Gee Hee Seo ),( Bo Ram Kwon ),( Ji Hyon Jang ),( Min Chul Choi ),( Chan Lee ) 대한산부인과학회 2016 대한산부인과학회 학술대회 Vol.102 No.-
Abdominal ectopic pregnancy has been reported to occur in approximately 1% of overall patients diagnosed with ectopic pregnancy. Definite diagnosis of abdominal pregnancy by using image study is limited. Early diagnosis is often delayed, which result in high maternal morbidity and mortality due to massive bleeding. Therefore, diagnostic surgical intervention should be generally considered as a first-line if there is any sign suspected for abdominal ectopic pregnancy. Uterine serosal pregnancy is extremely rare form of abdominal ectopic pregnancy. Exact mechanism of uterine serosal pregnancy is also not well defined, and only few cases were reported so far. Here, we report a case of 35-year-old primigravidarum who diagnosed with uterine serosal pregnancy via laparoscopic intervention. The patient was referred from local clinic for ruptured left tubal pregnancy at amenorrhea 5+0 weeks with elevated serum beta human chorionic gonadotropin (b-hCG) level (16,618mIU/mL). Transvaginal sonography revealed 1.8 cm sized mass located adjacent to the left cornus with certain amount of hemoperitoneum. With the preoperative impression of left cornual pregnancy with ruptured status, the patient was underwent emergent diagnostic laparoscopy. Entering the abdominal cavity, about 300 mL hemoperitoneum was noted, and 2x2cm-sized ruptured ectopic mass was dangling from the left posterior wall of uterine serosa, causing active bleeding. Both adnexae and other pelvic organ were grossly normal. The ectopic mass was successfully removed and the uterine scar was meticulous sutured. The pathologic reports confirmed the ectopic pregnancy. The patient's postoperative course was uneventful and the level of serum b-hCG gradually decreased within normal range. (1429 mIU/mL at POD 7, 79.47 mIU/mL at POD 14, and 4.87 mIU/mL at POD 28.
Successful laparoscopic management of uterine serosal pregnancy
( Gee Hee Seo ),( Hyun Jung Lee ),( Ji-hyun Jang ),( Min Chul Choi ),( Chan Lee ),( Gwangil Kim ) 대한산부인과학회 2017 Obstetrics & Gynecology Science Vol.60 No.4
Uterine serosal pregnancy is an extremely rare form of ectopic pregnancy. This is a report of a 35-year-old primigravida woman who was diagnosed with uterine serosal pregnancy via laparoscopic intervention. A 35-year-old woman (gravida 1, para 0) was referred from a local clinic for a ruptured left tubal pregnancy at amenorrhea 5+0 weeks with elevated serum beta human chorionic gonadotropin (16,618 mIU/mL). A pregnancy on the left posterior wall of the uterine serosa was diagnosed during the operation and successfully treated with laparoscopic surgery as a conservative management strategy to enable fertility preservation. With the advantages of ultrasonography and laparoscopy, an early diagnosis of a primary abdominal pregnancy located on the left posterior wall of the uterine serosa was made, prior to the occurrence of severe intra-abdominal massive hemorrhage, which was then treated laparoscopically as a conservative management strategy enabling the preservation of fertility.
철근콘크리트 건물의 리모델링을 위한 보-기둥 접합부의 내진성능 개선기술
하기주,신종학,최민권,박효선,장우혁 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
In this study, experimental research was carried out to evaluate the earthquake-resistant performance of reinforced concrete beam-column joint using carbon fiber materials in existing reinforced concrete building. Test result shows that Retrofitting specimen (RPC-CP2, RPC-CR, RJC-CP, RJC-CR) designed by the improvement of earthquake-resistant performance and ductility using new materials(carbon fiber board, carbon fiber rod and carbon fiber sheet) could attained more load-carrying capacity and stable hysteretic behavior.