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기판 종류에 따른 박막형 SnO<sub>2</sub> 가스 센서의 응답특성
김선훈,박신철,김진혁,문종하,이병택,Kim, Seon-Hoon,Park, Shin-Chul,Kim, Jin-Hyuk,Moon, Jong-Ha,Lee, Byung-Teak 한국재료학회 2003 한국재료학회지 Vol.13 No.2
Effects of substrate materials on the microstructure and the sensitivity of $SnO_2$thin film gas sensors have been studied. Various substrates were studied, such as oxidized silicon, sapphire, polished alumina, and unpolished alumina. It was observed that strong correlation exists between the electrical resistance and the CO gas sensitivity of the manufactured sensors and the surface roughness of $SnO_2$thin films, which in turn was related to the surface roughness of the original substrates. X$SnO_2$thin film gas sensor on unpolished alumina with the highest surface roughness showed the highest initial resistance and CO gas sensitivity. The transmission electron microscopy observation indicated that shape and size of the columnar microstructure of the thin films were not critically affected by the type of substrates.
화염상모반의 임상형태와 병리조직학적 소견과의 관계에 관한 연구
김선훈 (Seon Hoon Kim) 대한피부과학회 1984 대한피부과학회지 Vol.22 No.2
Nevus flammeus is benign but cosmetically devastating congenital vascular malformation whose past treaments have been marred by unacceptable complication or by unacceptable ineffectiveness. Argon laser is a therapeutic device which has been newly applied to this condition with fairly good result. However, all lesions do not show good response and it depends on the clinical and histopathological types. Therefore, it is very important to select patients who will show good response to argon laser therapy. Histological pattern was indicated as the most important prognostic factor. However, it is not always possible to get the histological data. This study was undertaken to evaluate whether it is possible to anticipate histologic patterns of nevus flammeus from color and clinical morphology of the lesions when biopsy is difficult to be taken. Color and clinical morphology of the lesions were recorded, and 4-mm punch biopsies were performed in 74 patients who visited the Laser Clinic in our dermatologic department during past 2 years, The study results were as follows. Eleven pink cases were all patch form morphologically but 8 cases(72, 7%) were constricted type and 8 cases(27 Q%) were intermediate type histopathologically. In 28 red cases, 27 cases(96 4gp) were patch form and only 1 case was smooth elevated form morphologically. And 2p cases(74, l%) were dilated or intermediate type and 7 cases(25 9%) were constricted or deep located type histologically.
아르곤 레이저 치료 후 화염상 모반의 병리조직학적 관찰
김선훈(Seon Hoon Kim),신기식(Ki Shik Shin),이유신(Yoo shin Lee),김철우(Chul Woo Kim) 대한피부과학회 1987 대한피부과학회지 Vol.25 No.6
We observed the histopathological findings in 16 patients with nevus flammeus according to the time sequence after argon laser therapy. The results were as follows : 1. Immediately after treatment There was nonspecific damage to the epidermis, upper part of the dermis and upper portion of the pilosebaceous unit to a depth of 0.4~0.5mm depth. The specific damage to the vessels, which showed thrombi formation and partial disruption of the vessel walls was seen to a depth of 0.8~0.9mm. 2. One week after treatment Crust was formed and the epidermis regenerated almost completely. The thrombi still persisted and there was partial disappearance of the vessel walls. 3. Four to 10 months after treatment The epidermis appeared normal except the rete ridge flattening. The upper dermis was diffusely fibrotic, with relatively few residual vessels, many of them with slit-like contour.
소아 환자에서 타과 입원 중 피부과에 의뢰된 환자에 대한 통계적 고찰
김선훈 (Seon Hoon Kim) 대한피부과학회 1988 대한피부과학회지 Vol.26 No.1
Statisticsl observation was made on 404 patients who had been referred for consultation to the Department of Dermatology during their admission in Seoul National University Children's Hospital from October 1985 to March 1987. The results were as follows : 1. The consulted pstients were 404 among 126,622 inpatients(0.32%). 2. The most frequent age group was below 1 year(25.0%). 3. Pediatrics was the most importnat department in the number, as well as in the rate of consulted patients to inpatients. 4. The most common 10 dermatoses were contact dermatitis, atopic dermatitis, drug eruption, fungal infection, viral infection, infantile eczema, benign tumor, miliaria, urticaria, and skin manifestation of systemic diseases in order of frequency. 5. The frequent causes of consultation were as follows ; the dermatologic diseases or conditions 67.6%, the diseases related to the trestment 13.4%, the skin lesions of systemic diseases 10.8%, the dermatologic tests 3.6%, and admitted to other departments with dermatologic diseases 1.2% respectively.
김선훈(Seon Hoon Kim),최지호(Jee Ho Choi),은희철(Hee Chul Eun) 대한피부과학회 1984 대한피부과학회지 Vol.22 No.2
As the incidence of dermographism in our urticaria clinie is quite high comparing data in other country, we have tried to survey the incidence of ermographism in the general population of Korea using a dermographic tester designed by other author. Total 8g7 healthy persons were included in this study from March J98$ to .December 1983. The study result was summarized as follows, 1. Male to female ratio was 2. 5: 1 and the peak age of the subjects was third(47 8%), fourth and fith decades in ecreasing order, The overall incidence of dermographisrn from the pressure of 48ppg/cm was 4.4% and there were no significa.nt difference in the incidences between male(4, 2%) and female(4 7%) (p>0. 1), and between the different age groups(p> 0 l)
김선훈(Seon Hoon Kim),정진호(Jin Ho Chung) 대한피부과학회 1987 대한피부과학회지 Vol.25 No.3
The argon laser has been used in the treatment of a variety of cutaneous vascular and pigmented lesions. In 1983, authors reported on the therapeutic effect from argon laser treatment of nevus flammeus. This study was undertaken to evaluate the therapeutic effect and complication of the argon laser on many cutaneous lesions except nevus flammeus. The data of the 67 patients who were treated between November, 1984 and March, 1986 and could be followed up over 3 months at the Department of Dermatology, Seoul National University Hospital were analyzed. Patients were treated with Coherent Radiation Model No. 920 Laser with a spot size of 1 mm in diatemer. The pawer ranges were between 1.6 and 2.6 W using pulsed wave or continuous wave according to the size and the shape of the lesions. The argon laser is an effective modality in the treatment of superficial vascular lesions and especially when telangiectasia is prominent. In pigmented lesions, argon laser is effective for pigmented nevi excluding intradermal nevi and has been found effective in small sized nevus spilus and lentigines.
이불화제논 기상 식각에 의한 실리콘 기판의 표면 텍스쳐링 특성
김선훈(Seon Hoon Kim),기현철(Hyun Chul Ki),김두근(Doo Gun Kim),나용범(Yong Beom Na),김남호(Nam Ho Kim),김회종(Hwe Jong Kim) 대한전기학회 2010 전기학회논문지 Vol.59 No.4
We investigated the haze and the surface roughness of textured Si substrates etched by XeF₂ etching system with the etching parameters of XeF₂ pressure, etching time, and etching cycle, Here, the haze was obtained as a function of wavelength from the measured reflectance, The haze of textured Si substrates was strongly affected by the etching parameter of etching cycle. The surface coughness of textured Si substrates was calculated with the haze and the scalar scattering theory at the wavel ngth of BDD ㎚. Then, the surface coughness was compared with that measured by atomic force microscope, The surface coughness5 obtained by two methods was changed with the similar tendency in terms of XeF₂ etching conditions.
김선훈 ( Kim Seon-hoon ),이원준 ( Lee Won-jun ),장웨이 ( Wei Zhang ),홍성엽 ( Hong Sung-yub ),이득행 ( Lee Deuckhang ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.2
현행 프리캐스트 콘크리트 실무에서는 프리캐스트 넓은보 (Wide Girder, 이하 WG) 공법에 대한 수요가 증가되고 있는 실정이다. WG 공법에서는 슬래브의 경간 감소와 동시에 우수한 구조 내력을 확보하는 데 최적화된 공법이다. 이 연구에서는 보-기둥 접합부를 관통하는 최적의 철근 배근 상세를 도출하고 내진성능을 평가하기 위하여 실험적 연구를 계획하였다. 실험의 주요변수는 보-기둥 접합부를 관통하여 정착되는 길이방향 철근의 상세로 설정하였으며, 실험결과를 통하여 현행설계 기준에서 규정하고 있는 철근콘크리트 특수모멘트 골조의 성능평가기준을 충분히 만족할 수 있는 것으로 나타났다.
김선훈(Seon Hoon Kim),박흥배(Heung Bae Park) 대한피부과학회 1986 대한피부과학회지 Vol.24 No.1
Although port-wine stains present as macular patches generally, some patients show considerable overgrowth of angiomatous tissue and show different results of laser therapy according to their histologic patterns. We observed 337 port-wine stain patients clinically, and tried to classify clinical morphology of port-wine stains and analyze with other features such as color, age and size. The results were as follows: Most of the lesions were located on the face, followed by neck, upper extremity, lower extremity and trunk in order. 2, On the face, the left lower part was the most frequent area of the lesions. The difference of the distribution between right and left side was not found, but the lesions were significantly more frequent on the lower part than the upper one. 3. The morphology was classified into patch, hypertrophic, cavernous and papular form according to therapeutic purpose. 4 When the color is darker, the others than the patch form appeared. 5, In old patients the color was darker and the papular form increased. 6. When the size enlarged, the hypertrophic form. increased. 7. Among ten patients who got the lesions at both the upper and lower eyelids, two showed ocular problems.