마이크로 ISFET pH 센서를 위한 REFET형 마이크로 기준전극

이성률,남태철,손병기 경북대학교 센서기술연구소 1990 센서技術學術大會論文集 Vol.1 No.1

For the miniaturation of H-ion sensor, the reference electrode should be miniaturized. This can be achieved by differential amplification system with ISFET/Pt/REFET. REFET(REference FET) was developed by forming PVC membrane on the ISFET gate. This new REFET for the differential amplifier consisting of ISFET/Pt/REFET has shown a good operating characteristics, The new micro H-ion sensor has shown a sensitivity of 52mV/pH with a good linearity in the range of pH 4 to pH 10, and been able to eliminate the effects of temperature and light.

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.

습식 생산방식에 의한 재생 잔골재를 사용한 콘크리트의 중성화 저항성 및 건조수축에 관한 실험적 연구

유명열,김병윤,이세현,심종우 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

The purpose of this study was to provide durability data of concrete using recycled fined aggregate which was produced through a wet production process for making it sure whether it can be put to practical use for concrete. In the experiment, recycled fine aggregate was substitute for natural fine aggregate the rate of 0, 25, 50, 75 and 100% each. The results of the study were as follows; 1 The depth of neutralization was become deeper according to the increase of substitutive ratio of recycled fine aggregate. 2 The performance of length alternation was fallen gradually according to the increase of substitutive ratio of recycled fine aggregate. Hut, it showed the similar durability with concrete using natural fine aggregate fewer than 50% substitution ratio. Bused on the above results, it is concluded that the recycled fine aggregate through the wet production process can be used IS fine aggregate on condition that the substitution ration is under 50%.

사용자 스케치와 예제 영상 질의에 의한 웹 기반 영상 검색 시스템

이상열,황병곤 대구대학교 정보통신연구소 2003 情報通信硏究 Vol.2 No.1

내용기반 영상 검색 시스템은 시각 정보를 이용하여 데이터베이스에 저장되어 있는 영상을 검색하는 것이다. 본 논문에서는 웹 에이젼트를 이용하여 웹상에서 멀티미디어 정보를 검색하는 것으로 HTML문서에 나타나는 텍스트 중 영상 이름이나 링크에 붙어 있는 영상을 위미하는 텍스트를 추출한다. 제안된 시스템은 웹 브라우저에서 사용자의 스케치와 예제 영상 질의로 검색하는 방법을 제시하여 실험결과를 통해서 질의 효율성을 나타내었다. Content based image retrieval system retrieves an image from a database using visual information In this paper we describe our approach of developing a general purpose image retrieval system over the WWW using web agent The Web agent extracts image text information from the link and file contents in HTML The proposed system retrieves the images from database using a user sketch and a example image quries on web browser Experimental results demonstrate the effectiveness of the new approach

N-Gram 색인에 의한 웹 멀티미디어 검색엔진 구현

황병곤,이상열 대구대학교 정보통신연구소 2003 情報通信硏究 Vol.1 No.2

대부분의 멀티미디어 검색시스템은 아직까지 내용기반에 의한 검색기술이 실용적 사용이 어려우므로 텍스트기반 검색을 하고 있다. 본 논문에서는 Web상에서 미디어 정보를 검색하는 것으로, HTML문서상에 있는 텍스트 중 이미지의 표제나 이미지 링크상의 텍스트를 추출하여 색인 정보로 사용하였다. 이 텍스트 추출방법은 기존의 N-Gram색인 방법에 질의자의 선택 가중치를 부여하므로 검색 효율을 높일 수 있다. As most Multimedia retrieval system is using text based retrieval not be practical to content based retrieval can not be practical to it. In this paper, we retrieve multimedia contents in the web. After extracting the texts to express the name and link of images. We used them as indexing information in item. We add the weight of the user to the existing N-gram indexing method. Therefore, we can incase a retrieval efficiency.

수맥탐사 시스템의 PDA 구현

이상열,황병곤 대구대학교 정보통신연구소 2003 情報通信硏究 Vol.1 No.2

본 논문은 GPS와 지자기장을 이용하여 수맥을 좀더 효율적으로 탐사하기 위한 시스템구축이다. 본 논문에서 제시한 시스템은 휴대하기 간편한 PDA를 이용하여 탐색 영역의 수맥에 관한 정보를 자동적으로 데이터베이스로 저장시킬 수 있기 때문에 탐색에 소요되는 인력과 시간을 절약시킬 수 있다. 한편 개발된 시스템은 획득한 자료분석을 통해서 시추하여야할 위치를 정확히 분석할 수 있다. This paper presents system to enable an efficient water vein detection using GPS and geomagnetic fields. Because the presented system in this paper can be automatically saved the data acquired from GPS and geomagnetic instrument into the database, it can be decreased the number of detectors and saved the time for water vein detection. It can be analyzed the position for the drilling correctly.

恐水病 豫防接種後 發生한 重症 神經合倂症의 1例

趙炳菊,朴弘烈 金原出版 1961 小兒科 Vol.2 No.2

AZO 투명전도막의 전기 광학적 특성에 미치는 PET 기판 표면처리 효과

박병욱,김지훈,성열문,추영배,곽동주 경성대학교 공학기술연구소 2008 공학기술연구지 Vol.15 No.-

In this paper aluminium-doped zinc oxide(ZnO:Al) conducting layer was deposited on polyethylene terephthalate(PET) substrate by r. f. magnetron sputtering method PET substrate was modified by a DBD(dielectric barrier discharge) plasma before sputtering to improve the electric and optical properties of ZnO:Al film and to increase also the deposition rate The effect of heat treatment time on the dectrical, optical, chemical and structural properties of ZnO:Al thin film were investigated experimentally The PET films modified with the DBD plasma showed a significant decrease in water contact angle The deposition rate of ZnO:Al film in the case of the plasma-treated substrate was also increased by around 2 times compared to the untreated substrate The minimum resistivity of about 28×10-3 Ω-cm and transmittance of about 83.3% were obtained under the experimental condition of 6min of heat treatment time.

하악과두 골절에 대한 임상통계학적 연구

박충열,김병국 전남대학교 치의학연구소 2001 구강과학 Vol.13 No.3

The present study was aimed to aid the diagnosis and choose the approrpiate treatment method of the fracture. This is the retrospective clinicostatistical study about 87 patients who were treated about condylar fractures for recent 4 years from Apr. 1, 1996 to Apr. 30, 2000 in Chonnam National University Hospital and can be followed up reguarly. In the incidence of fractures, subjects in the twenties has highest incidence and male has 4.1 time higher prevalance than in female. The fracture was at the highest incidence in September. The most common cause of the fracture was traffic accident (40.2%), and in case of middle facial concomitant injuries, laceration was 45.1% and the fracture of symphysis was 57.1% in lower facial injuries. The most common site of the fracture was the condylar neck, followed by subcondye and condylar head in order. patients aged under 11 years were treated closed reduction which was 100% and for those aged over 19 years, open reduction (68%) was preferred. Most of them were fixed with metal miniplate in case of open reduction. The average period of fixation was 9.8 days, of which was 11.8 days for closed reduction and 8.5 days for open reduction. The average maximal mouth opening was lower in case of open reduction than in closed reduction in condylar head fracture. Closed reduction and direct fixation with Risdon showed better functional recovery than in SVRO cases. The complications like fibrous ankylosis and bone resorption of TMJ was happened in the case of open reduction with SVRO. These results suggest that the condylar fracture will be treated with closed reduction if patients are growing children and the fractured condyle was not displaced, otherwise the open reduction will be preferred. The closed reduction and the direct fixation with Risdon method showed better functional recovery than in SVRO method.

재발성 일과성 허혈 발작을 주소로 내원한 비-안와-대뇌 모균증 1예

강우열,이주헌,성영희,최일수,송홍기,이병철 대한노인병학회 2002 대한노인병학회지 Vol.6 No.3