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김승택,김형태,이상호,김종석,Kim, Seung-Taek,Kim, Hyung-Tae,Lee, Sang-Ho,Kim, Jong-Seok 한국반도체디스플레이기술학회 2010 반도체디스플레이기술학회지 Vol.9 No.4
Charged micro-particles are widely used as the key components for many electrical applications such as an e-paper, a touch panel, a printer toner and an electronic ink. Among them, the e-paper is an emerging reflective type display using the charged particles that has the advantages of the extremely low power consumption and sunlight readability. To create images on the e-paper, we confine black positively-charged and white negatively-charged particles between bottom and top electrodes and selectively apply the electric field. When the Coulomb force by an applied electric field is greater than the adhesion force between the charged particle and the electrode, the particles' transition happens resulting in the change of color between black and white. Therefore, the adhesion force is a very important factor for designing and estimating e-paper's operation. In this study, we constructed a basic model for particle's transition and an adhesion force equation describing particle's transition with three different forces: electrostatic image force, Van der Waals force and gravitational force. The simulation results showed that the gravitational force is negligible for the interesting range for the charge and the radius, and the adhesion force can be strongly dependent on the particle's charge and radius.
Poly aniline(PANI) 전극을 이용한 Organic photovoltaic(OPV) cell 제작
이의진(Ue Jin Lee),윤종진(Jong Jin Yoon),정명조(Myung Jo Jung),김승택(Seung Taek Kim),이상호(Sang Ho Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
We present highly efficient indium tin oxide free Organic photovoltaic cells based on poly-(3-hexylthiophene) and [6,6] - phenyl - C60 - butyricacid methyl ester (P3HT : PCBM) comprising a polymeric anode from highly conductive organic solvent-based polyaniline(PANI). The transmittance and sheet resistance of the PANI film were varied in the ranges of 65?.90% at 550nm and 50?380 Ω/□ respectively. We fabricated ITO-free OPV cells using PANI as an anode, which exhibited an external power conversion efficiency of 1.2% with a result of Jsc of 5.355㎃/㎠, Voc of 0.615V, and FF of 30.33% under an illumination of air mass(AM) 1.5G (100㎽/㎠).
위암에서의 진단 방법들의 유용성 평가 : 수술 전후의 병기 결정의 비교
최재홍(Jae Hong Choi),나병규(Byung Kyu Na),오상우(Sang Woo Oh),이지현(Jee Hyun Lee),정상무(Sang Moo Jung),박선미(Seon Mee Park),윤세진(Sae Jin Yun),김승택(Sung Taek Kim),이복희(Pok Hee Lee) 대한내과학회 1997 대한내과학회지 Vol.53 No.2
N/A Backgroud: Gastric cancer remains the main cause of cancer-related death in Korea. Accurate preoperative staging of gastric cancer is essential to predict prognosis and to plan optimal treatment. Although there are many reports dealing with the diagnostic values of conventional methods, controversies are still present especially in the field of preoperative staging. In this study, we evaluated the accuracy of gastroscopy and upper gastrointestinal series(UGI) for diagnosis of gastric cancer, and determined the usefulness of ultrasonography and computed tomography for preoperative staging. Methods : One hundred twenty-three patients, who underwent operation from Aug. 1991 to Mar. 1995 under the diagnosis of gastric cancer were analyzed. We excluded 15 patients because their postoperative definitive stagings were undetemined. Results : 1) Among 123 patients, the proportion of early gastric cancer was 26.0%(32/123) and that of the advanced gastric cancer was 74.0%(91/123). 2) The sensitivity of endoscopic diagnosis of gastric cancer was 96.7%(119/123), and the accuracy to determine the depth of invasion was 82.9% (102/123). 3) The sensitivity of UGI study for gastric cancer was 89.9%(98/109), and the accuracy to determine the depth of invasion was 61.5%(61/109). 4) The sensitivity of abdominal ultrasonography to detect the tumor was 11.3%(8/71), the accuracy to determine the T stage was 29.2%(28/96), and the sensitivity and specificity to detect lymph node metastasis was 13.6%(8/59), 100%(37/37), respectively. 5) The sensitivity of abdominal CT to detect the tumor was 74.3%(26/35), the accuracy to determine the T stage was 32.5%(13/40), and the sensitivity and specificity to detect lymph node metastasis were 34.5%(9/29), 72.7%(8/11), respectively. 6) The accuracy of preoperative staging was 45.5%(56/123). The 49.6%(62/123) of gastric cancer was downstaged, whereas only 4.1%(5/123) was overstaged. Conclusion: Our results show that high accuracy for diagnosis of gastrie cancer with the gastroscopy and UGI. However preoperative staging with ultrasonography and computed tomograpy was often underestimated, which could be concluded that the usefulness of the radiologic methods was limited.
PVC 제조공장 근로자의 염화비닐 폭로수준 추정 방법 및 건강진단 시행방법 개발에 관한 연구
김 헌,남윤정,김승택,김대영,한설희,박국태 大韓産業醫學會 1994 대한직업환경의학회지 Vol.6 No.2
In order to develop questionnaire estimating vinyl chloride monomer(VCM) exposure levels, to reset selection criteria for detailed tests, to measure current VCM exposure levels, to evaluate the mutagenic effects of VCM exposures and to develop multiphasic screening method of PVC- or VCM-handing workers, VCM concentrations of work environments were measured and tentaive self-administrative questionaire, physical examination, sister chromatid exchange(SCE) test and some clinical chemical test were applied to 195 men who had been working in factories producing or handing VCM or PVC(Exposed Group) and 37, in the same factories without exposure to VCM or in polyethylene- or polypropylene-related factories(Control Group). Mean VCM concentrations of work environments were 0.268 ±0.183 ppm under PVC synthesis processes, 0.160±0.200 ppm under VCM synthesis processes, 0.076±0.111 ppm under PVC pipe producing processes, 0.090±0.108 ppm under PVC wall paper, sheet, or film producing processes, 0.071±0.051 ppm under PVC floor producing processes, 0.243±0.250 ppm under PVC sash producing processes, and 0.020±0.031 ppm under triming process. VCM levels of work environments under manual resin mixing processes(0.209±0.168 ppm) were higher than those of the others (0.209±0.168 ppm)(p-value<0.05). There was no VCM-related symptoms, the positive response rates of which were higher in the Exposed Group. Overall abnormal rate in clinical chemistry test of the Exposed Group was higher than that of the Control Group, but due to extremely low exposure level of exposure group and to small sample size of the Control Group, no statistical significance was found(p-value>0.05). SCE frequencies of the Exposed Group were significantly higher than those of the Control Group(p-value>0.05) and those of test-abnormal persons were higher than those of test-normal persons. SCE frequencies linearly increased with not only current but also cumulative VCM exposure levels(p-value>0.05). These results suggest that adverse health effect may ensue from VCM exposure to as low as 1 ppm. But SCE frequencies had no statistically correlation with drinking amounts, smoking amounts or radiation dose equivalents. Questinnaire was revised to these results and fomula estimating cumulative VCM exposure levels based on occupational history in questionnaire were made. In addition, were presented methods evaluting work environments and multiphasic screening test for PVC workers.