무색소성 색소 실조증(Ito 저색소증) 1예

방성원,이정열,황규왕,정현,김영근 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.1

Incontinentia pigmenti achromians(IPA) or Hypomelanosis of Ito is a very rare neurocutaneous syndrome which is often associated with cutaneous, cerebral, musculoskeletal and ocular abnormalities. It is assumed that it is autosomal dominant of inheritance in character. There is also a relationship between IPA and incontinentia pigmenti(IP). However, the etiology of IPA is not known. We describe a 4-year-old girl with myopia, esotropia and retinal pigmentary degeneration in addition to the hypopigmented skin lesion of IPA, and reviewed clinically the cases of IPA in this article.

TMA 가스센서용 마이크로히터 발열특성 연구

박성현,최우창,김성우,류지열,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1

The microheaters with Si_(3)N_(4)(1500Å)/SiO_(2)(3000Å)/Si_(3)N_(4)( 1500Å) diaphragm were fabricated by thin film technology and silicon micromachining techniques. Pt and poly-Si(n+) materials were used as heater materials of microheater. Pt temperature sensor was fabricated to detect the temperature of microheaters. The thermal analysis including temperature distribution on diaphragm and power consumption of the microheater were executed by the FEM method and heat transfer equations. The power consumption of the Pt and poly-Si(n+) heaters were measured and compared to that of thermal analysis by FEM simulation.

기능성 식품으로의 활용을 위한 한약자원에 관한 연구 : (Ⅱ) 인진쑥 열수 추출물이 혈관과 국소뇌혈류량에 미치는 영향 및 추출물을 이용한 건강음료의 개발 (Ⅱ) Effects of Hot Water Extracts from Artemisia capillarisin on Vessel and Regional Cerebral Blood Flow and Development of Health Drink

박성혜,임흥렬,안병용,한종현 동아시아식생활학회 2003 동아시아식생활학회지 Vol.13 No.6

As an attempt to develop new functional health beverage by using medicinal herb, Artemisia capillaris, we investigated the effect of scopoletin in Artemisia capillaris on vessel and regional cerebral blood flow (rCBF) of rats ingesting health drink prepared with Artemisia capillaris extracts and various ingredients. Artemisia capillaris extract decreased the vessel contraction and increased rCBF significantly. The extracts were grouped by heat temperature and mixed ratio and tested their respective characteristics. Then each condition was combined and produced the most effective one. The drink produced consisted of Artemisia capillaris extract 42%, honey 9.8%, citric acid 0.035%,cyclodextrin 1.47% and water. Brix, pH and acidity of the product were 9.2, 4.4 and 0.04%, respectively. This drink scored to have highest level on overall acceptance by the sensory evaluation. The above results showed that development of such functional beverage using Artemisia capillaris can be used as a functional material improving blood circulation in beverage industry.

ZnO 박막 센서의 DMA 가스 검지 특성

김성우,최우창,류지열,박성현,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1

The DMA(Dimethylamine) gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method. We investigated the sensitivity and response time according to temperature variation and DMA gas concentration. The ZnO-based thin film sensors sputtered in oxygen atmosphere showed higher sensitivity than those sputtered in argon atmosphere. The ZnO-based thin film sensors doped with Al_(2)O_(3), In_(2)O_(3) and V_(2)O_(5) and sputtered in oxygen atmosphere showed the maximum sensitivity of 218(working temperature, 250 ℃, DMA gas, 160 ppm) and speedy response time. The ZnO-based thin film sensors doped with Al_(2)O_(3), In_(2)O_(3), TiO_(2) and V_(2)O_(5), sputtered in oxygen atmosphere and aged at 330 ℃ showed the maximum sensitivity of 156(working temperature, 250 ℃, DMA gas, 160 ppm).

TMA 가스 센서를 위한 발열체 제작 및 특성

박성현,류지열,최혁환,권태하 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1

Pt/Ti heater for TMA gas sensor was fabricated by RF magnetron sputtering method. It was grown on heated Si substrates of 250 ℃ at a pressure of about 5 mTorr in the pure argon gas with RF power of about 140 watts. Pt and Ti target alternated at intervals of even 2 minutes for 30 minutes. The heater which was grown in the ratio of 1 to 1(Pt:Ti) exhibited initial(room temperature) resistance of 45 ohms and a power dissipation of 9.6 watts up to 300℃ heater temperature. The width of resistor variance(R_(T)/R_(O)) exhibited 1.65. We can conclude that heater which was grown in the ratio of 1 to 1(Pt:Ti) is useful as a heater for TMA gas sensor

열처리에 따른 ZnO 박막 센서의 특성

류지열,박성현,최혁환,권태하 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1

The ZnO(zinc oxide) thin film sensors were manufactured by RF magnetron sputtering method and added up to 4 wt. % Al_(2)O_(3), 1 wt. % TiO_(2) and 0.2 wt. % V_(2)O_(5) on the basis of ZnO material for developing the high sensitive gas sensors which have practically moderate resistivity and the stability. They were also grown on heated SiO_(2)/Si substrates of 250 ℃ at a pressure of about 10 mTorr in the pure oxygon gas with a power of about 80 watts for 10 minutes. To manufacture the thin film of the more stable high sensitivity, the thin films were also annealed from 400 ℃ to 800 ℃ and the thin films which were annealed with 700℃ for 60 minutes in the pure oxygon gas exhibited a good properties. The thin film grown in this conditions exhibited the sensitivity of maximum 550 in TMA gas concentration 160 pμm and exhibited a good stability and excellent linearity.

메타분석을 통한 가정특성 관련변인이 학업성취에 미치는 영향

박성열,구병두,임현걸 건국대학교 교육연구소 2000 論文集 Vol.24 No.-

This paper was designed to synthesize quantitatively the master's theses and doctoral dissertations focusing on effects of family background traits related variables on academic achievements in Korean. This task was accomplished by utilizing the meta-analysis technique of research integration as defined by Glass(1982). Basically, meta-analysis is a statistical analysis of the summary findings of many empirical studies. Its purpose is to draw reliable and general conclusions form a large and complex body of literature on a common topic. Thus, the primary purpose of this paper was to conduct a quantitative synthesis of 96 master's theses and doctoral dissertations focusing on the effects of academic achievements using family background traits as independent variable and academic achievement as dependent variable. Nine independent variable were chosen by means of in depth review of those previously mentioned 96 studies. The independent variables employed in this study include psychologcal environment, physical environment, family structure, public and private educational expenditures, education process, breeding and education method of parents, socio-economic status, parents' characteristics, and role expectation. These variable are cartegorized by two different groups according to the traits of factors in terms of family environment variable group and parent's characteristics variable group. This study set the following questions to be answered: (1) How large are the grand average effect size of variables of family background traits proposed in this study on student's academic achievement?; (2) How different the effect size of the two family background traits related variable groups, naimly family environment and parents characteristics variable group on student's academic achievement?; and, (3) How different the effect size of the nine family background traits related independent variables on student's academic achievement? In order to answer the research questions, the researcher followed the standard procedures as such locating published studies to collect primary data, analysing and cording the characteristics and outcomes of the studies, and carring out statistical procedures of mata-analysis to describe the overall and sub-variable effects. Primary source of data was decided to limit within the master's these and doctoral dissertations in order to achieve the reliability and validity of the study results. By using the CD-ROM titled 'masterㆍdoctoral dissertation index' published by National Central Library in 1995 and 1997, a total of 112 studies were located and collected. Out of 112 studies, 96 studies were selected by excluding those studies that are not possible to employ mata-analysis such as studies used qualitative research method. While classifying family background traits related variables some of studies were also excluded in this study due to failing a consensus among the five specialists participated in this process. The effect size were calculated by using two different approaches depending upon the applicability of effect size formula. One was by using mean and standard deviation of experimental group and their countpart. The other was using transformational formula suggested by Wolf(1986) for the studies that have not presented descriptive statistics. The result of this study may be summarized as follows: (1) The grand average degree of effects of the academic achievement factors proposed in this study turned out to be .33. This means that if the average size of effects of the academic achievement factors of the controlled group is 50 percentile in normal distribution, that of the experimental group becomes 62.93 percentile. As it were, the latter surpass the former by 12.94 percentile. (2) Between the two groups of academic achievement factors proposed in this study, in terms of family environment variable group and parent's characteristics variable group, the former factors showed the higher average effect size, its average effect size being .35. Considering the grand average degree of effects size of .33,it can be suggested that those family environment related variables effects more on the student's academic achievement compare to the variables of parents' characteristics. Among the nine family background traits related independent variables on academic achievements proposed in this study, the variable of educational process showed the highest average effect size of 1.40, as followed by socio-economic status(effect size of 0.55),role expectation(effect size of 0.48), and physical environment(effect size of 0.40). The effect size of these variables turned out to be bigger that the grand average effect size of .33. This result means that these variable effects on student's academic achievement a lot more compare to other variable proposes in this study. In fact, the effect size of those variable such as phychologcal environment(effect size of 0.27), breeding and educational method of parents(effect size of 0.27), family structure(effect size of 0.26), public and private educational expenditures(effect size of 0.26), and parents' characteristics(effect size of 0.14) turned out to be much smaller than that of previously mentioned variables. It means that the variable of psychologcal environment, breeding and education method of parents, family structure, public and private educational expenditures, and parents' characteristics effect less on student's academic achievement compare to the variables of educational process, socio-economic status, role expectation, and physical environment.

도시고형폐기물 소각시 발생하는 유해가스의 제거에 관한 연구

배성렬,공성호,황의현 한양대학교 에너지·환경기술연구소 1994 에너지·環境技術論文集 Vol.1 No.-

도시고형폐기물 소각로에서 발생하는 오염물질은 분진, 염화수소 및 황산 화물과 같은 산성가스, 중금속(철, 아연, 납, 카드뮴, 수은, 크롬 등), 다이옥신과 퓨란과 같은 독성유기화합물질로 구분되어질 수 있다. 소각로에서 발생하는 분진은 대기 오염 방지설비인 여과집진장치(Bag Filter)의 설치로 소거할 수 있다. 여과집진장치는 퇴적된 먼지층을 가진 여과포의 표면에 연소배가스를 통과시켜 효과적인 제거효과를 나타낼 수 있다. 먼지 분리기능은 interception, diffusion, 관성충돌(inertial impaction)의 전체적인 조합으로 나타낼 수 있으며 결국은 일정농도 이하의 청정가스만이 여과포를 통과할 수 있다. 염화수소 및 황산화물과 같은 산성가스들은 여과집진장치의 전단에서 알카리성석회 수용액을 분무하여 건조시켜 제어할 수 있다. 희석된 석회 수용액을 일정량 분사형 소각로 배기가스와 흡수반응을 일으켜 염화칼슘이나 황산칼슘과 같은 중성염을 생성시킨다. 건조된 후단의 여과집진장치에서 분진과 함께 배기가스와 분리되어 포집된다. The flue gas emission of pollutants from municipal waste incinerator can be catagorized as particulate matters : acid gases such as HCI and SO₂: certain metals such as iron, zinc, lead, cadmium, mercury, chromium, and others : and traces of toxic organic compounds particularly chlorinated aromatics such as dioxins and furans. The emission of particulate matters from the stack is typically controlled by the incorporation of bag filter as part of an air pollution control system for the waste incinerator. Bag filter will efficiently prevent the emission of even very fine particulates by surface filtration of the flue gas through a woven or felted fabric material with a layer of deposited dust. The mechanism for this dust seperation can be characterized as a combination of internal flowline interception, diffusion, sieving, and gravity resulting in an overall very low penetration of dust with cleaned gas. The acid gases, HCI and SO₂are being removed by the spray drying of an alkaline lime slurry into the flue gas prior to the bag filter. Spraying dilute lime slurry by atomixation generates a significant amount of wetted alkaline surface area onto which the acid gases can diffuse from the bulk gas phase and subsequently be absorbed in the liquid droplets. Eventually the water contained on these droplets is being evaporated, and the absorbed acids having reacted with calcium hydroxide in the droplets will form salts of calcium chloride, calcium sulfates, etc. These dried salts will be collected in the downstream located bag filter along with the particulate matters entrained from the incinerator.

생체용 Ti합금의 양극분극특성에 미치는 Zr 및 Pd의 영향

정종현,이길홍,최칠남,노학,백승남,이상열 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.2

The corrosion resistance of Ti-Zr-Pd-Cr alloys were investigated in order to reveal their possible use for new biomedical implant materials. Titanium alloys consisting of 10∼20%Zr, 0.0∼0.4%Pd and 0.15%Cr were prepared by vacuum arc-melting as alloying elements instead of using hardness Al and V in response to recent concerns about the long term safety of Ti-6%Al-4%V ELI alloys. The Ti-Zr-Pd-Cr alloys were heat-treated at 1000℃ for 2hrs under a vacuum atmosphere. The effect of Zr and Pd Ti alloys on the corrosion resistance for biomedical implant was investigating the anodic polarization curve at 37℃ in 5%HCI solution deaerated by high-purity N₂gas bubbling. The critical current density for passivation(I ) of Ti-Zr-Pd-Cr alloys didn't reveal markedly. Passive current density(I ) at 1.0V vs. SCE of this alloys decreased with increasing Zr in the contents from 10 to 20% and decreased with containing Pd in the range from 0.2 to 0.4%. Potential(E ) at 0.1A * m-² of this alloys increased with increasing Zr in the contents from 10 to 20% and increased with containing Pd in the range from 0.2 to 0.4%. For the Co-30%Cr-6%Mo alloy, passivity zone is narrow, and rapid increase of current density result from the low potential in comparison with Ti and Ti alloys. The corrosion resistance by the anodic polarization of Ti-20%Zr-0.2%Pd-0.15%Cr alloy was found to be superior to those of the Ti, Ti-6%Al-4%V alloy and Co-30%Cr-6%Mo alloy. The passive films formed on the Ti-20%Zr-0.2%Pd-0.15%Cr and Ti-6%Al-4%V alloys in the anodic polarization test consist mainly of TiO₂, Ti compound, ZrO₂, Al₂O₃and V₂O₃.

n-CdS_(0.46)Se_(0.54)/p-Cu_92-x)S_(0.46)Se_(0.54) 이종접합 태양전지의 제작과 그 특성에 관한 연구

유상하,최승평,이상열,홍광준,서상석,김혜숙,전승룡,윤은희,문종대,신영진,정태수,신현길,김택성,유기수 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-

승화방법에 의해 CdS_0.46Se_0.54 단결정을 성장하여 결정구조를 조사하고, Van der Pauw 방법으로 Hall effect를 측정하여 carrier density의 온도 의존성과 mobility의 온도 의존성을 조사하였다. 성장된 CdS_0.46Se_0.54 단결정을 치환반응하여 n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 이종접합 태양전지를 제작하였다. Spectral response, 전류-전압특성 및 전력변환 효율을 조사하여 그 결과로부터 개방전압은 0.48V, 단락 전류 밀도는 21mA/㎠, fill factor와 전력변환효율은 각각 0.75와 9.5%를 얻었다. CdS_0.46Se_0.54 single crystal was grown by a sublimation method. The crystal structure and the temperature dependence of carrier density and mobility of CdS_0.46Se_0.54 single crystal were studied. Heterojunction solar cells on n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 were fabricated by the substitution reaction. The spectral response, the J-U characteristics and the conversion efficiency of the n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells were studied. The open-cricuit voltage, short-circuit density, fill factor and conversion efficiency of n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells under 80mW/㎠ illumination were found to be 0.48V, 21mA/㎠, 0.75 and 9.5%, respectively.