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질소 상압플라즈마를 이용한 TiO<sub>2</sub> 박막의 표면개질 및 광활성 평가
임경택,김경환,박준,김경석,박유정,송선정,김종호,조동련,Lim, Gyeong-Taek,Kim, Kyung Hwan,Park, Jun,Kim, Kyoung Seok,Park, Yu Jeoung,Song, Sun-Jung,Kim, Jong-Ho,Cho, Dong Lyun 한국공업화학회 2009 공업화학 Vol.20 No.4
상압플라즈마 공정을 이용하여 $TiO_2$ 박막의 표면을 개질하고 광촉매 활성을 평가하였다. $TiO_2$ 박막은 $TiO_2$ 졸-겔 용액에서 유리판에 dip-coating법으로 코팅한 후 소성 온도와 소성 시간을 변화시켜 가면서 제조하였다. 표면 개질에 사용된 플라즈마는 질소 플라즈마였으며, 방전전력, 처리시간 등의 공정변수를 변화시키면서 실험을 수행하였다. 광촉매 활성은 UV-A와 형광등 하에서의 메틸렌 블루 분해효율을 바탕으로 평가하였다. XPS 분석 결과, 박막의 표면에 소량의 질소가 도핑되었음을 알 수 있었으며, 광촉매 효율은 UV-A와 형광등 하에서 모두 증가하였고, 특히 형광등 하에서 좀 더 증가하였다. $TiO_2$ thin films were surface-modified with atmospheric plasma and their photocatalytic activities were evaluated. The films were deposited on glass plates by dip-coating in a $TiO_2$ sol-gel solution and sintered at various temperatures for various times. Nitrogen plasma was used for the modification and the experiments were carried out varying operational parameters such as discharge power and treatment time. Photocatalytic activity was evaluated based on the degradation efficiency of methylene blue (MB) under irradiation of UV-A and fluorescent light. According to XPS analysis, a little amount of nitrogen was found to be doped in the film surface after the modification. As a result, photocatalytic activity increased under irradiation of UV-A and fluorescent light, especially fluorescent light.
임경택,원시태,Lim, Kyoung-Taek,Won, Si-Tae 한국금형공학회 2017 한국금형공학회지 Vol.11 No.1
A conventional taped banknotes detecting device in the banknote counting machine have some problems caused by temperature, humidity, dust and other environmental conditions. In order to the improve the detection performance of taped banknote in the banknote counting machine, we developed taped banknotes detecting device that the ultrasonic wave sensor was replaced by mechanical method device. There are many factors for the performance of the taped banknote detecting device of a mechanical method, we considered three main factors that are the amplification ratio of the thickness of banknotes, the pressing force of banknotes and the feeding speed of banknotes. We carried out the experiments with the 27 kinds of combination of these three main factors. As the result, accurate detection was possible to the normal banknotes and taped banknotes regardless of the feeding rate in terms of the amplification rate 27 times and the pressing force 660gf.
자궁경부 세포진검사에서 저등급 편평상피내 병변 (low grade squamous intraepithelial lesion)을 지닌 여성의 임상적 고찰
김태진,심재욱,이영아,박종택,정환욱,박인서,임경택,이기헌,김희숙,강옥림,함경렬 대한부인종양 콜포스코피학회 1998 Journal of Gynecologic Oncology Vol.9 No.2
The purpose of this study was for clinical evaluating those women with low grade squamous intraepithelial lesions (LSIL) who have been detected on Pap smears. We analyzed 279,270 Pap smears, from January 1994 to August 1997, of which 703 cases were identified as LSIL, and their medical records were reviewed retrospectively. Among them, 616 cases were able to follow-up by altered methods (repeated Pap smear only vs. histologic examination) and their efficacy for detecting more significant lesion (high grade squamous intraepithelial lesion: HSIL or invasive cancer) were also compared. The results were as follows; 1. The frequency of LSIL on Pap smears was approximately 0.25%. 2. The mean age was 39 years (range 18 ∼70 years). 3. Most of the gross finding of the cervix were normal or mild erosion. 4. Most of symptom was asymptomatic, or nonspecific. 5. Eighty-seven women with LSIL on initial Pap smears, have performed repeated Pap smears. 74 (85.1%) was normal, 7 (8.0%) was ASCUS, 6 (6.9%) was LSIL. Remained 52 women had subsequently histologic examination such as colposcopic directed biopsy or cone knife biopsy. These histologic results showed 192 (36.3%) with normal, 258 (48.8%) with LSIL, 77 (14.6%) with HSIL, 2 (0.4%) with microinvasive carcinoma. Based on the results in this study, we emphasize the importance of regular screening procedures for early detection of cervical lesions because there was no specific clinical characteristics in women with cytologic diagnosis of LSIL. In addition, we recommened colpo-scopic directed biopsy or cone knife biopsy as follow-up evaluation method in women with LSIL on initial Pap smear for detecting more significant cervical lesion.
난소가 적출된 임신성 융모성 질환에서 고원정체를 보인 p-hCG의 완전관해에 관한 증례
김태진,현우영,심재욱,이기헌,정환욱,강옥림,함경렬,이문섭,임경택,박종택,박인서 대한부인종양 콜포스코피학회 1998 Journal of Gynecologic Oncology Vol.9 No.2
Although chemotherapy remains to be the mainstay of treatment of trophoblastic disease, hysterectomy has been performed as the primary management of nonmetastatic trophoblastic disease who desire sterilization and for uterine disease resistant to chemotherapy. Clinically, the documentation of disease regression is provided by serial quantitative serum β-hCG assays and the persistent disease may be indicated when the serum β-hCG values rise for 2 weeks or plateau for 3 weeks or more. Because of similarity in molecular structure, the confounding effect of an elevated LH on β-hCG assessment in castrated women after treatment for trophoblastic disease has been documented. This LH cross-reactivity may be suspected in women with bilateral oophorectomy demonstrating persistent low levels of β-hCG. It is particularly true when the assay is perfo-rmed by conventional polyclonal radioimmunoassay. We have experienced two cases of nonmetastatic trophoblastic disease whose serum β-hCG assay plateaued at a low level atotal abdominal hysterectomy with bilateral salpingo-oophorectomy and chemotherapy. Clinical and radiologic work-ups were done for metastatic lesion in dose patients, but the results were negative. The quantitative LH assays (Serono LH MAIAclone kit, Roma, Italy) were performed with the sera obtained from the patients; the results were 37 and 31 mIU/ml (1st IRP) with β-hCG of 14 and 13 mIU/ml (1st IRP), respec-tively. With the initiation of oral estrogen replacement thrapy to those patients, the quantitative β-hCG values fell below 5 mIU/ml (1st IRP) and they remained in complete chemical remission without any additional chemotherapy for one year. The persistant low titers of β-hCG in those patients were considered to be result of LH cross-reactivity on β-hCG assessment. It is concluded that whenever the assay of β-hCG shows persistent low titers in the oophorectomized patient for treatment of trophoblastic disease, LH cross-reactivity should be suspected.