ZnO 박막을 TCO로 사용한 염료감응형 태양전지의 제작

박미주,공대영,황문식,마재평 호남대학교 정보통신연구소 2006 정보통신연구 Vol.16 No.-

Dye-Sensitized Solar Cell was fabricated at general lab. with common and chief matters: TiO_(2) powder as semiconductor, Eosin-Y as dye, I^(-)/I_(3)^(-) as liquidus electrolyte, and Ag as bottom-electrode. And ZnO thin film as TCO was sputtered on the glass substrate. As a result, open-circuit voltage was generated in these samples. It was found that this cell that is fabricated under common conditions is commercially available.

치과용 임플란트로 적용을 위한 스테인리스강 표면의 Ti/TiN film 증착

최한철,고영무,백대화,박영록,박지윤 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.1

A study on Ti/TiN film coating on stainless steels for application as dental implants have been investigated. The stainless steels containing Ti were solutionized 1050℃ for 1hr. Then the surface was deposited with Ti and TiN by using electron-beam deposition method. The deposited layer and microstructure were analyzed by using XRD, WDX, XPS and SEM. The hardness and wear resistance of deposited surface were examined and corrosion behavior were investigated by using potentiostat, XPS and SEM. The results were as follows: 1. Some defects showed on the deposited surface, such as crater and microdroplet, and surface roughness increased in all specimen after TiN deposition. 2. Ti/TiN deposited layer showed columnar structure which nucleated and grew on the special crystalline direction and plane: Ti/TiN layer TiN(220) and TiN(200). 3. The hardnesses of Ti/TiN layer was higher than that of TiN layer. 4. In case of stainless steel containing high Ti content, Ti/TiN layer showed better wear resistance than that of TiN layer. 5. Pitting potential of TiN film in NaCl solution increased as Ti content increased, but pitting potential of Ti/TiN film were not affected by the Ti content of substrate. Pitting potential of Ti/TiN film showed high value than that of TiN film in NaCl solution. The number and size of pits were apparently decreased by Ti/TiN film deposition on the stainless steel.

장애인 입소시설과 특수학교의 구강건강관리 실태에 대한 조사 연구

이광희,김대업,하순영,박종석 대한소아치과학회 2000 大韓小兒齒科學會誌 Vol.27 No.2

전국의 123개 장애인 입소시설과 102개 특수학교를 대상으로 구강건강관리 실태를 파악하여 장애인의 구강건강관리 계획을 수립하는 데 사용할 수 있는 근거를 마련하고자 하였다. 설문지 조사법으로 연구하였다. 정기구강검진은 특수학교에서 연2회 실시하고 있었으나, 장애인 입소시설에서는 56.8%에서 시행하였다. 우식 예방 프로그램은 장애인 입소시설의 69.1%, 특수학교의 86.3%에서 시행하였으며 프로그램의 종류는 입소시설에서 규칙적 칫솔질이 58.1%, 특수학교에서 예방교육이 65.7%로 가장 많았다. 불소를 이용한 우식예방은 입소시설과 특수학교에서 각각 8.6%, 11.8%에서 시행하고 있었으며, 열구전색은 각각 6.8%, 6.9%에서 시행하였다. 치과치료를 시행하고 있는 입소시설과 특수학교에서는 각각 84.2%, 39.2%이었고, 입소시설에서 치료를 받기 위해 이용하는 곳은 치과의원(60.2%), 보건소(16.8%), 자원봉사자(15.3%), 대학병원(1.0%) 등이었다. 치료를 위해 치과의원에 방문하여 치료를 거부당한 경험이 있는 응답자는 17.7%이었다. 주요어 : 장애인, 입소시설, 특수학교, 정기구강검진, 우식예방, 치과치료. The purpose of study was to investigate the oral health care status in institutions and special schools for the disabled in Korea. Nurses in 123 institutions and nurse-teachers in 102 special schools were asked to fill questionnaires regarding periodic oral examination. preventive dental programs, and dental treatment. The results of this study were as follow. 1.56.8% of institutions implemented regular oral examinations and all of special schools did it twice a year. 2.Preventive programs for dental caries were done in 69.1% of the institutions and 86.3% of the special schools. Programs included regular toothbrushing and dental health education. 3.Dental treatment was done in 84.2% of the institutions and 39.2% of the special schools. Institutions utilized private dental clinics(60.2%), public health centers(16.8%), volunteers(15.3%), and dental hospitals. 4.17.7% of the institutions experienced the refusal to treat the disabled by private dental clinics.

8년간(1992~1999) 산업안전보건연구원에 의뢰된 직업병 심의 사례 분석

강성규,김규상,김양호,최정근,안연순,진영우,최병순,양정선,김은아,채창호,최용휴,김대성,박정선,정호근 대한산업의학회 2000 대한직업환경의학회지 Vol.12 No.2

Objectives : Pneumoconisis and noise-induced hearing loss (NIHL) have been reported as main occupational diseases by the Special Health Examination. The Industrial Accident Compensation Insurance has reported various work-related diseases, however, these two diseases occupied almost a half of compensated cases. Therefore, it was not well known about the status of occupational diseases other than pneumoconiosis, NIHL, and cardio-cerebrovascular accident (CVA). This study was conducted to analyze claimed cases as an occupational disease, that was requested to the Korea Industrial Safety and Health Agency (KOSHA). Methods : The local office of the Korea Labor Welfare Corporation (KLWC) has asked the KOSHA for confirmation of claimed cases as an occupational disease. We analyzed 379 cases requested from KLWC, the Ministry of Labor, employers, unions and occupational health agencies from 1992 to 1999. Results : Male was 80.7 % of the requested cases. Their mean age was 42 years old and 75.5 % of them were more than 35 years old. The requested cases were increased rapidly from 25 cases in 1992 to 108 cases in 1999 and the accept rate was 50.7 %. The majority of requested cases were respiratory diseases(22.4%), cancers(18.5%), Neuropsychiatric problems(14.5%), and musculoskeletal problems(13.5%). The accept rate was high in reproductive, respiratory, musculoskeletal and digestive disorders and low in neuropsychiatric, renal and otologic problems and occupational cancers. 73.6% of them were caused by chemical agents, especially 28.5 % were by organic solvents. 67% of them were clinically confirmed at university hospitals. A half of the cases were from KyongIn area, even the request came from the whole country. Conclusions : A claim was common in workers whose age was over 35 years old and exposure history was over 10 years. The respiratory diseases and neuropsychiatric disorders were still main problems in occupational health and occupational cancers was increasing even though its accept rate was not high yet.

Ecological Indicators of Forest Degradation after Forest Fire and Clear-cutting in the Siberian Larch (Larix sibirica) Stand of Mongolia

Park, Yeong Dae,Lee, Don Koo,Stanturf, John A.,Woo, Su Young,Zoyo, Damdinjav Korean Society of Forest Science 2009 한국산림과학회지 Vol.98 No.5

This study was conducted to investigate ecological indicators of forest degradation after forest fire and clear-cutting in the Siberian larch (Larix sibirica Ledeb.) stand of Mongolia. The species abundance and biodiversity indices were higher in burned and clear-cut stands than those of reference stand, but boreal understory species, such as Vaccinium vitis-idaea, Pyrola incarnata, Linnea borealis and Maianthemum bifolium, completely disappeared and was replaced by sedge species, such as Carex duriuscula, C. lanceolata, C. pediformis, Poa attenuata and P. pratensis. During the research period, temperature increased by an average of $1.6^{\circ}C$ in burned stand and $1.7^{\circ}C$ in clear-cut stand compared to reference stand, but RH sharply decreased up to 15.7% in clear-cut stand. This result indicates that Larix sibirica stand became warmer and drier after forest fire and clear-cutting, and contributed to the abundance of sedge and grass species in the understory. Moreover, intense occupation of tall sedge grass after forest fire and clear-cutting had a vital role as obstacle on natural regeneration of Larix sibirica. The similarity of species composition between reference and burned stands was higher (73.6%) than between reference and clear-cut stands (63.8%). Soil moisture significantly decreased after forest fire and clear-cutting, and the extent of decrease was more severe in the clear-cut stand. The chemical properties at soil organic layer were significantly affected by forest fire and clear-cutting but not the mineral horizons. Inorganic nitrogen of the forest floor significantly decreased in the clear-cut stand ($1.1{\pm}0.4mg{\cdot}kg^{-1}$) than that of the burned ($4.5{\pm}2.3mg{\cdot}kg^{-1}$) and reference stands ($5.0{\pm}2.3mg{\cdot}kg^{-1}$). Available P of the forest floor significantly increased after fire, whereas it decreased after clear-cutting. These results indicate that existence of boreal understory vegetation, and changes in soil moisture and available P are distinct attributes applicable as ecological indicators for identifying forest degradation in Mongolia.

Pre-stimulation of CD81 expression by resting B cells increases proliferation following EBV infection, but the overexpression of CD81 induces the apoptosis of EBV-transformed B cells

PARK, GA BIN,KIM, DAEJIN,PARK, SUNG JAE,LEE, HYUN-KYUNG,KIM, JI HYUN,KIM, YEONG SEOK,PARK, SAE-GWANG,CHOI, IN-HAK,YOON, SUNG HO,LEE, YOUN JAE,PAENG, SUNGHWA,HUR, DAE YOUNG UNKNOWN 2015 INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE Vol.36 No.6

<P>Hepatitis C virus (HCV) E2 protein binds to CD81, which is a component of the B cell co-stimulatory complex. The E2-CD81 interaction leads to B cell proliferation, protein tyrosine phosphorylation and to the hypermutation of immunoglobulin genes. Epidemiological studies have reported a high prevalence of B cell non-Hodgkin lymphoma (NHL) in HCV-positive patients, suggesting a potential association between HCV and Epstein-Barr virus (EBV) in the genesis of B lymphocyte proliferative disorders. In the present study, in order to investigate the association between EBV and HCV in B cells, we created an <I>in vitro</I> EBV-induced B cell transformation model. CD81 was gradually overexpressed during transformation by EBV. B cells isolated from HCV-positive patients grew more rapidly and clumped together earlier than B cells isolated from healthy donors following EBV infection. Pre-stimulation of CD81 expressed by resting B cells with anti-CD81 monoclonal antibody (mAb) or HCV E2 accelerated the generation of lymphoblastoid cell lines (LCLs) by EBV infection. These cells proliferated prominently through the early expression of interleukin-10 and intracellular latent membrane protein (LMP)-l. By contrast, the overexpression of CD81 on EBV-transformed B cells by anti-CD81 mAb or HCV E2 protein induced apoptosis through reactive oxygen species (ROS)-mediated mitochondrial dysfunction. These results suggest that the engagement of CD81 expressed by B cells has differential effects on B cell fate (proliferation or apoptosis) according to EBV infection and the expression level of CD81.</P>

Characterization of Nanopores on Micropillars Pt Electrodes for Non-Enzymatic Electrochemical Sensor Applications

Dae Joon Park,Yi Jae Lee,Jae Yeong Park 대한전자공학회 2007 Journal of semiconductor technology and science Vol.7 No.3

In this paper, mesoporous Pt on micro pillars Pt electrode is newly designed, fabricated, and characterized on silicon substrate for non-enzymatic electrochemical sensor micro-chip integrated with CMOS readout circuitry. The fabricated micro/nano Pt electrode has cylindrical hexangular arrayed nano Pt pores with a diameter of 3.2 ㎚ which is formed on top of the micro pillars Pt electrode with approximately 6㎛ in diameter, 6㎛ in space, and 50 ㎛ in height. The measured current responses of the fabricated plane Pt, mesoporous Pt, and mesoporous Pt on the micro pillar Pt electrodes are approximately 9.9 ㎁/㎟, 6.72 ㎂/㎟, and 7.67 ㎂/㎟ in 10mM glucose solution with 0.1M phosphate buffered saline (PBS) solution, respectively. In addition, the measured current responses of the fabricated plane Pt, mesoporous Pt, and mesoporous Pt on the micro pillar Pt electrodes are approximately 0.15 ㎂/㎟, 0.56 ㎂/㎟, and 0.74 ㎂/㎟ in 0.1mM ascorbic acid (AA) solution with 0.1M phosphate buffered saline (PBS) solution, respectively. This experimental results show that the proposed micro/nano Pt electrode is highly sensitive and promising for CMOS integrated non-enzymatic electrochemical sensor applications. Since the micro-pillar Pt electrode can also be utilized with a micro-fluidic mixer in the sensor chip, the sensor chip can be much smaller, cheaper, and easier to be fabricated.

Cone Morphological Variation of the Picea jezoensis Complex in Eastern Asia

Park, Yeong-Dae,Chang, Kae-Sun,Jin, Guang Ze,Kim, Hui,Chang, Chin-Sung Korean Society of Forest Science 2010 한국산림과학회지 Vol.99 No.2

Picea jezoensis with several infraspecific taxa is indigenous to Eastern Asia and the Far East of Russia. Although these taxa are very common, the taxonomic confusion surrounding this complex is reflected in ambiguity of the various taxonomic treatments currently used. Patterns of intraspecific variations of cone morphology and recognition of taxa within the P. jezoensis complex were investigated from 175 individuals. Morphological variation of cone characters was determined by the univariate analysis to be insignificant in separating most previously recognized infraspecific taxa in Korea, China, Russia, and Japan. Our statistical analysis showed that cones from northern populations were larger and wider than those from southern populations. Individuals from South Korea were predominantly smaller even than those from Honshu of Japan which were previously recognized as var. hondoensis. All measured characters appeared to show some clinal variation with changes in latitude, and a distinctive trend was evident. Consequently var. hondoensis, var. koreana, and var. microsperma cannot retain their infraspecific state within the P. jezoensis complex.

Ecological Indicators of Forest Degradation after Forest Fire and Clear-cutting in the Siberian Larch(Larix sibirica) Stand of Mongolia

Yeong Dae Park,Don Koo Lee,John A. Stanturf,Su Young Woo,Damdinjav Zoyo 韓國林學會 2009 한국산림과학회지 Vol.98 No.5

Variations in Biomass, Photosynthesis and Water Use Efficiency of Five Different Species of Two-year-old Seedlings Grown in a Field Nursery in Mongolia

( Yeong Dae Park ),( Don Koo Lee ),( Nyam Osor Batkhuu ),( Su Young Woo ) 한국임학회 2005 한국임학회 학술발표논문집 Vol.2005 No.-