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최현성,이지현,윤석권,김한욱,임철완 대한피부과학회 2004 大韓皮膚科學會誌 Vol.42 No.3
Papillary eccrine adenoma is a rare benign sweat gland neoplasm. It occurs most often as a solitary nodule in women and is located predominantly on the distal portion of the extremities. This tumor is similar to tubular apocrine adenoma in histological and clinical aspects, so distinction of these tumors is still controversial. We report a case of two papillary eccrine adenomas developed on the left popliteal and calf area of a 58-year-old-man, this is the first report of the multiple papillary eccrine adenomas in Korea. (Korean J Dermatol 2004;42(3):353~355)
칼슘과 아연으로 치환된 Y0.8 Pr0.₂ Ba₂ Cu₃ O7_δ 의 전기 및 자기적 성질에 관한 연구
김성재,전인,박영민,강재필,노태호,박현진,최숙자,송승기 명지대학교 자연과학연구소 1996 자연과학논문집 Vol.14 No.-
전이온도가 72K인 고온초전도체 Y?P?B?Cu?O?에서 초전도성을 감소시키는 Pr원소자리에 Ca과 Zn를 적당히 치환시켜 자기적 성질을 연구하였다. 초전도 전이온도(Tc)는 Ca이 치환된 시료의 경우 80~85k의 범위에서 측정되었으며, Zn가 치환된 경우에는 35~49K의 값을 보였다. 비저항의 온도 변화로부터 결정된 전기적 전이온도는 온도에 대한 자기모우먼트으 변화에서 구한 자기적 전이온도와 비슷한 값을 보였다. 자기이력곡선으로부터 Bean의 모델을 이용하여 Hcl(저임계자기장), Hc?(고임계자기장), 반자성정도, 임계전류밀도를 측정하였다. 이러한 성질들은 시료 내에 Ca의 치환량이 많아질수록 증가하였으며, Zn가 많아질수록 급격히 감소하였다. 특히 임계전류밀도는 x=0.0인 시료는 1.60x10?A/㎠이었으며 Ca이 치환된 시료는 1.30~1.98x10? A/㎠, Zn가 첨가된 시료는 3.5x10?~1.3x10?A/㎠의 값으로 계산되었다. 이것은 시료 내에서 Ca은 초전도성을 증가시키고, Zn는 초전도성을 감소시키는 것을 의미한다. We have studied magnetic properties as a appropriate substitute of Ca and Zn element for Prelement which reduces superconducting properties in the high-temperature superconductor Y?Pr?Ba?Cu?O? of transition temperature 72K. When Ca is put into, the critical temperature(Tc)showed the value of measurement at the range of 80~85K while for Zn the Tc had the range of 35~49K. The electric critical temperature determined by the temperature dependence of resistivity had a similar data to the magnetic field), Hc?(high critical magnetic field), diamagnetic ratio and critical current density have observed by Bean's model from the magnetic hysterisis curve. These properties were increased with adding Ca and abruptly decreased with adding Zn in the samples. Especially, the critical current density of x=0.0 sample was calculated at 1.60x10?A/㎠ and those of the other Ca-added samples at the range of 1.30~1.98xA/㎠and those of Zn-added samples at the range of 3.50x10?~1.30x10?A/㎠. These mean that Ca increases supercondecting properties in the sample and Zn element decreases them.
폐수 처리에 있어서 중금속 이온의 Ferrite 생성에 관한 연구
김현수,이승무,최상기 연세대학교 산업기술연구소 1984 논문집 Vol.16 No.1
This investigation was carried out to conduct the formation of Ferrite from heavy metal ions in industrial wastewater. In this study, wastewater was treated with alkali and ferrous sulfate solutions in Batch/CSTR, under the various, conditions, to form Zn-and Mn-ferrite. The optimum conditions were found from the batchwise experiment;??/?? mole ratio was 5.0 at 65℃ of reaction temperature in 90min. of residence time, thereby obtaining the chemical composition of ferrite such as (??)?? ?? in 92.6% of yield(wt.%). And the experimental results of continuous operation in CSTR were obtained for the formation of ferrite such that the residence time was more than 80min. with the previously obtained optimum conditions for more than 85% of yield.
사람 치수 세포와 치주 인대 세포의 유전자 발현에 관한 비교 연구
소현,박상혁,최기운 대한치과보존학회 2009 Restorative Dentistry & Endodontics Vol.34 No.5
The purpose of this study was to characterize functional distinction between human dental pulp cells(PC) and periodontal ligament cells(PDLC) using cDNA micro array assay and to confirm the results of the microarray assay using RT-PCR. 3 genes out of 51 genes which were found to be more expressed(>2 fold) in PC were selected, and 3 genes out of 19 genes which were found to be more expressed(>2 fold) in PDLC were selected for RT-PCR as well. According to this study, the results were as follows: 1. From the micro array assay, 51 genes were more expressed (2 fold) from PC than PDLC. 2. RT-PCR confirmed that ITGA4 and TGFβ2 were more expressed in PC than in PDLC 3. From the micro array assay, 19 genes were more expressed (2 fold) from PDLC than PC. 4. RT-PCR confirmed that LUM, WISP1. and MMP1 were more expressed in PDLC than in PC. From the present study, different expression of the genes between the PC and PDLC were characterized to show the genes which play an important role in dentinogenesis were more expressed from PC than PDLC, while the genes which were related with collagen synthesis were more expressed from PDLC than PC. 본 연구는 사람 치수세포 및 치주인대세포의 차이를 알아보고자 배양한 각각의 세포를 CDNA microarray assay를 통하여 유전자의 발현정도의 차이를 비교하였다. 그 결과를 바탕으로 각각의 세포에서 2배 이상의 유전자 발현의 차이를 보이는 유전자중 특징적인 3가지 유전자를 선택하여 RT-PCR로 검증한 결과 다음과 같은 결론을 얻었다; 1. Microarray assay 결과, 치주인대 세포에 비해 치수 세포에서 2배 이상 발현한 유전자 수는 총 51개가 나타났다. 2. RT-PCR의 결과, 치주인대세포에 비해 치수 세포에서 ITGA4, TGF-β2 등이 높게 나타났다. 3. Microarray assay결과, 치수 세포에서 비해 치주인대 세포에서 2배 이상 발현한 유전자 수는 총 19개가 나타났다. 4. RT-PCR의 결과, 치수 세포에 비해 치주인대세포에서 LUM, WISP1, MMP1 등이 높게 나타났다. 본 연구 결과로 치수세포에는 상아질 형성에 관여하는 특징적인 유전자가 치주인대세포에 비해 높게 발현되었으며, 치주인대세포에는 교원질 합성에 관여하는 특징적인 유전자가 치수세포에 비해 높게 발현되어, 치수세포와 치주인데 세포는 유전자 발현의 차이가 나타남을 알 수 있었다.
전자석 작동기를 이용한 드릴의 선회진동제어 : Control of the Whirling Vibration of the Drill by Electromagnetic Actuator
김중배,이상조,최현 연세대학교 산업기술연구소 1991 논문집 Vol.23 No.2
The drill is the most widely used tool in the world to make holes on the workpiece. But the performance of the drill is affected by many factors. One of them is to get the position of the drill at the beginning of the penetrating stage. The drill vibrates laterally while it rotates. Especially in case of a thin and long drill, the magnitude of the whirling vibration of the drill becomes very large and makes critical problem. Therefore, several methods have been used to get a correct position during drilling process. As an example, center drills or guides are used to make the drill get correct position. But these methods are passive. In this paper, studies for an active control are carried out to get the correct position of the drill by reducing the whirling vibration of the drill which occurs before the drill contacts the workpiece. The active phase lead algorithm is applied in order to control the vibration of a twist drill, which has dimension as follows: diameter φ3 and length 150mm.
Poster Session : PS 0663 ; Rheumatology ; The Seasonality of Gout Onset and Flares in Korea
( Hyo Jin Choi ),( Chan Hee Lee ),( Joo Hyun Lee ),( Bo Young Yoon ),( Hyoun Ah Kim ),( Chang Hee Suh ),( Sang Tae Choi ),( Jung Soo Song ),( Hoyeon Joo ),( Sung Jae Choi ),( Ji Soo Lee ),( Kee Chul S 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: To evaluate seasonality of gout onset and fi ares in Korea. Methods: We retrospectively examined data from 330 patients seen at nine rheumatology multicenter clinics, under urate lowering therapy (ULT) more than one year after stopping prophylactic medication. Demographic data, clinical and laboratory features and seasonality of gout fi are were collected. Season was classifi ed as three-month time intervals (the period from March through May was defi ned as spring). Results: The mean age was 52.2 years and mean disease duration was 26.8 months. The male to female count was 318:12. The season of gout onset was most common in summer (28.5%). During ULT, 113 of the 330 patients (34.2%) experienced at least one gouty attack in the period from stopping prophylaxis to one year later. Total gout fi ares were one hundred forty-seven (male 97.3%). Gout fi ares were most common in summer (30.6%), and then fall (25.2%), spring (22.4%), and winter (21.8%). The most common month of fi are was June (13.6%), following by August (10.2%), September (9.5%) and February (9.5%). The aggravating factor was identifi ed in 60 fi ares; alcohol (68.3%), concomitant drugs (13.3%), food (10.0%), and work/exercise (8.3%). The proportion of alcohol in summer was higher (88.9%) than other seasons. In the patients with attained to the target serum uric acid (< 6mg/dL) at the end of prophylaxis (n=52), gout fi ares were most common in fall (35.8%) and September (17.0%). Conclusions: Gout onset of Korea was most common in summer. The summer and fall were most common seasons of gout fi are during ULT. We suggested that increased physical activity, changes of temperature, dehydration and alcohol consumption might be associated with our results.
3D dosimetry by compass program with array detector for volumetric modulated arc therapy
Hyun Do Huh,Sang Hyoun Choi,Sang Hyoun Choi,Hun Jeong Kim,Seong Hoon Kim,Young Hoon Ji,Kum Bae Kim,Dong oh Shin,Suk Lee,Jang Bo Shim,Sam Ju Cho,Sang Hoon Lee,Kwang Hwan Cho,Chul Kee Min 대한방사선방어학회 2011 대한방사선방어학회 학술발표회 논문요약집 Vol.2011 No.11