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김영유,전종현,류성주,이영섭,이기원,최봉수 대전산업대학교 반도체기술연구소 2000 半導體技術硏究所報 Vol.2 No.-
단결정규소 웨이퍼를 15% HF에탄올 용액에서 양극 산화시켜 다공질규소를 얻는 과정에서 전류밀도와 에칭시간에 따라 굴절률이 주기적으로 변하는 다충의 다공질규소층(porous silicon multilayers)을 구현하였다. 그리고 다층의 다공질규소층(Ⅰ) 다공질규소 발광충, 또 다른 다층의 다공질규소층(Ⅱ)의 순으로 구성된 porous silicon microcavity(PSM)를 제작하고 그 물성을 조사하였다. PSM 상하에 위치한 다층의 다공질규소층의 단면을 AFM(Atomic Force Microscope)으로 조사한 결과 고굴절률과 저굴절률이 주기적으로 교차하는 층이 균일하게 형성되었으며, 중앙의 다공질규소 발광층도 균일하게 나타났다. 다층의 다공질규소층 및 다공질규소 발광층의 두께를 각각 실호파장의 1/4배 및 2배가 되도록 하였을 때 특정파장의 필터로 쓰일 수 있는 브래그 반사경(Brag reflector)의 특성이 나타났다. 또한 PSM의 발광 스펙트럼은 그 반치폭이 현저히 감소하고 발광의 세기가 크게 증가되는 경향을 보였다. By periodically varying the current density and etching time during anodic oxidation of crystalline silicon wafers in 15% HF-ethanol solution, we obtained porous silicon multilayers which have periodically varying refractive index. We fabricated the porous silicon microcavity (PSM) which consist of porous silicon multilayers(Ⅰ), active layer of porous silicon, and porous silicon multilayers(Ⅱ) and investigated its physical properties. The AFM (Atomic Force Microscope) measurement from the cross section of multilayers (Ⅰ and Ⅱ) shows uniformity of high refractive index and low index layers as well as the active layer. We observed the characteristics of Bragg reflector when the thickness of layers was 1/4 and the thickness of active layer was twice of the effective wavelength, which can be used as a filter for specific wavelength. We found the emission characteristic from the PSM, which FWHM (full width half maximum) was considerably decreased and emission intensity was increased.
비만 여성을 대상으로 한 해조류 추출물의 국부처치와 운동 병행을 통한 지방분해 효과의 임상적 검정
서태수,이인숙,변재철,김규호,박승한,김유영,김상국,김현정,김상기,신동철,성미영,박종석,김종기,박언휘 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.3
This study was carried out to test the body fat breakdown during topical seaweed extract treatment and in combination with the aerobic exercise. Of 20 female obesity subjects, ten treated a cream types of seaweed extract(control group) and ten treated a placebo cream(placebo group). Topical treatment of each sample was designed for 4 weeks, and treated with 2 times a day about 10ml on the abdomen and the thigh, respectively. All subjects were participated aerobic dance half hour a day and four times a week. After 4 weeks of topical treatment and exercise, they were measured body fat, skinfold thickness, body circumference. Then venous blood samples were taken and analyzed blood cells, serum enzymes, and serum lipids. There were reduction of body weight, % of body fat, antebrachium, brachium, chest, waist, thigh circumference and abdomen thickness between pre and post treatment in both group. Especially, body weight and % of body fat significantly reduced in the subjects treating the seaweed extract than those treating the placebo. There were significant decrement in total cholesterol and LDL whereas increment in HDL and TBIL in the control group, but no significant difference in the placebo group. In conclusion, there were 7.6% of body fat reduction during 4 weeks of aerobic exercise and 21% of body fat reducement in combination of topical seaweed treatment and exercise, respectively. These results suggest that the topical treatment of seaweed extract should be very effective for fat breakdown. Especially, the body fat breakdown maximized in the combination with the topical seaweed extracts treatment and the aerobic exercise.
표피 성장인자의 국소적용이 인체 표피화에 미치는 효과에 대한 연구
김현옥,유성종,정승문,김성수 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.3
An understanding of the mechanism of healing has increased dramatically during the past decade. The phenomenon of epithelization is important in the normal resurfacing of a donor site or a partial thickness burn wound. This study was conducted to clarify the effect of epidermal growth factor in wound healing of human. Paired donor sites were created in 18 patients who required skin grafting for either burns or reconstructive surgery. One donor site from each patient was treated topically with silver sulfadiazine cream, and the other was treated with silver sulfadiazine cream containing epidermal growth factor(10ug/ml) (Human recombinant epidermal growth factor ; Sigma, St.Louis, Mo). The donor sites were photographed daily, and healing was measured with the use of planimetric anlysis. The donor sites treated with silver sulfadiazine containing epidermal growth factor had an accelerated rate in all 18 patients as compared with that in the paired donor sited treated with silver sulfadiazine alone. Combining data from all patients demonstrated reduced the average time to 100% healing by approximately 2 to 3 days (p<0.01). Light and electron microscopical study of biopsy specimens taken from the centers of donor sites three days after the onset of healing supported these results. In conclusion, epidermal growth factor accelerates the rate of healing of partial thickness skin wound.
김희진,위유민,박성규,홍성수,조태식,이상호 조선대학교 구강생물학연구소 2002 口腔生物學硏究 Vol.26 No.2
Dentinogenesis imperfecta is an inherited disorder of dentin formation, usually exhibiting an autosomal dominant mode of transmission. Type Ⅰdentinogenesis imperfects occurs in Patients afflicted with osteogenesis imperfecta. Type Ⅱdentinogenesis imperfecta is not associated with osteogenesis imperfects. Type Ⅲ dentinogenesis imperfecta (Brandywine type) occurs in a racial isolate area in the state of Maryland. Clinically, the color of teeth may range from a gray to brownish violet or yellowish brown with translucent or opalescent hue. The enamel often chips and fractures away, allowing speedy attrition of the remaining, poorly calcified. softer dentin. Roentgenographic features include pulpal obliteration, bulbous crowns and short and blunted roots. The cementum, periodontal membrane and the supporting bone appear normal
김유동(You-Dong Kim):박홍수(Hong-Soo Park):김성용(Seong-Yong Kim),이재호(Jae-Ho Lee) 대한자원환경지질학회 2005 자원환경지질 Vol.38 No.2
북한은 마그네사이트 , 금 , 아연 , 철 , 희유금속을 비롯하여 금속광물자원과 석탄 등 에너지 자원이 비교적 풍부한 것으로 파악되고 있다 . 북한은 광물자원 개발 및 처리와 밀접한 6 곳의 공업지대가 형성되어 있고 , 아직까지는 잘 보전된 자원관련 인프라를 유지하고 있으며 러시아의 영향을 받아 자원관련 기초기술이 발달된 것으로 파악되고 있다 . 우리나라는 년 간 약 8 조원의 광물 및 석탄자원을 수입하는 자원 - 에너지 다소비국가이다 . 남북한 자원개발협력은 북한의 풍부한 자원 , 자원개발 및 처리 관련 인프라 , 기초 기술력 등 장점을 활용하고 한국의 자본 및 러시아의 선진 자원처리기술과 접목시키는 방향으로 검토되어야 할 것으로 사료된다 . North Korea is plentiful in the mineral resources as magnesite, gold, zinc, iron, rare metal, and coal resources compared to South Korea and has 6 industrial zones which are located nearby to the mineralized areas. The industrial zones are provided with a sound infrastructures and accumulation of advanced technology. As a huge mineral and energy consuming country, South Korea imports mineral and coal resources equivalent to almost 8 trillion won annually. Inter-Korean cooperation for development of mineral resources in North Korea will be improved by the practical use of the North Korea s plentiful mineral resources, infrastructures related to development and refinement, and basic geo-technology, which would be considered toward combining with South Korean capital and Russian geo-technologies.