GPS 수신기 개발을 위한 DLL과 TDL의 성능 평가

정영태,김명돈,정규태,김해식,김민호,홍성일,정주수,박재운,변건식 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.1

The Navstar GPS satellite planned to provide continuous and precise position and time information to observers. In this paper, we make a comparative performance of GPS receiver, using noncoherent DLL and TDL as the core parts in GPS receiver, code tracking loop. The receiver consists of costas loop for carrier lacking, and data recovery circuit for bit-synchronization. Consequently, the receiver using noncoherent DLL is superior to TDL in respect to correlation efficiency.

20대여성의 유방자가검진에 대한 지식과 자기효능감의 관계연구

강지혜,유리나,박민아,박신영,양은주,이주은,전시은,정윤혜,최연아,홍재하,이자형,정덕유,배노연 이화여자대학교 간호과학대학 2009 이화간호학회지 Vol.- No.43

The purpose of this study was to know relationship between important variables which influence lifestyle in college women`s health promotion, prove adjustable factors and provide basic data which develops nursing intervention health promotion program. The method of this study was descriptive correlational study. The convenience sample was 206 college woman who live alone in lodgings, dormitory, a reading room or off-campus housing. Research instruments were the Multidimensional Health Locus of Control(MHLC) developed by Wallston, Wallston & Devellis(1978), Interpersonal Support Evaluation List developed by Cohern, Hoberman(1983) and The Health Promotion Lifestyle Profile(HPLP) developed by Walker, Pender & Sechrist(1978) and the data was used after Factor Analysis. The result of this study was follows. 1. It can be found that the level of the college woman`s health promotion lifestyle was 2.46±.33 with higher fulfilling level: According to general characteristic, the level of health promotion lifestyle was 5% significant statistical differences by age and period of menstruation. 2. The level of health locus of control was 3.25±.31 with higher fulfilling level. 3. The interpersonal support level was 3.05±.44 with higher fulfilling level. 4. The level of interpersonal support turned out most convincing factor in health promotion lifestyle (9%). In addition to age factor, two factors was 10% power of explanation in whole health promotion.

서울지역 4년제 간호대학생들의 임상실습 유,무에 따른 진로태도성숙

권혜진,김보람,김소연,김수임,성정아,신영미,윤서진,이경진,홍영선,이자형,정덕유,신혜원 이화여자대학교 간호과학대학 2009 이화간호학회지 Vol.- No.43

This study was conducted to investigate the differences in the degrees of career attitude maturity according to the clinical practice experience of the college of nursing students. The convenience sample was 275 students attending the college of nursing in Seoul. Data was obtained through a questionnaire from December 1st to 12th, 2008. The instrument used to measure the career attitude maturity in this study was "A barometer of maturity in career attitudes" developed by Ki-hak, Lee(1997). The collected data were analyzed by descriptive statistics, Chronbach's alpha, t-test and ANOVA with the SPSS 16.0 program. Below is the result of this study. 1. The average score for career attitude maturity of nursing students who experienced clinical practices was 135.56(±12.17): higher than the average score of inexperienced students, 134.37(±12.44). However it could not show meaningful differences in the statistics(F=-.805, p=.422). 2. Determinacy, one of five subordinate concepts of career attitude maturity, was statistically significative. On average, the group comprised of students with clinical practices scored 27.60(±3.81): higher than that of unpracticed students, 26.63(±4.26)(F=-1.976, p=.049). 3. The more academic years they have, except for junior year students, the points of career attitude maturity relative to general characteristics were increasingly higher. The points were 132.60(±11.99) for freshmen, 135.93(±12.72) for sophomores, 133.50(±12.57) for juniors and 138.11(±11.24) for seniors(F=2.714, p=.045). 4. According to the age of the group, the grade of career attitude maturity became higher. The scores were 133.21(±12.34) for 18-19yrs., 134.05(±12.16) for 20-22yrs., 138.43(±10.96) for 23-26yrs. and 148.71(±12.76) for 27-32yrs. (F=5.118, p=.002). 5. The average total score for career attitude maturity of nursing students was 135.00(±12.30). Of the five subdivisions―readiness, conviction, determinacy, independence and finality― readiness demonstrated the highest result with 32.33(±4.46) followed by conviction, determinacy, independence and finality respectively. Based on the results, there are some proposals for further researches. As this research was only for college of nursing in Seoul, it is necessary to compare career attitude maturity with 3-year colleges and other departments. In addition, alongside clinical practices there is a growing need to develop programs that will not only provide guidelines but also prepare students for the maturity of their career attitude.

실제 네트워크 모니터링 환경에서의 ML 알고리즘을 이용한 트래픽 분류

정광본(Kwang Bon Jung),최미정(Mi Jung Choi),김명섭(Myung Sup Kim),원영준(Young J. Won),홍원기(James W. Hong) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.8B

Traffic classification의 방법은 동적으로 변하는 application의 변화에 대처하기 위하여 페이로드나 port를 기반으로 하는 것에서 ML 알고리즘을 기반으로 하는 것으로 변하여 가고 있다. 그러나 현재의 ML 알고리즘을 이용한 traffic classification 연구는 offline 환경에 맞추어 진행되고 있다. 특히, 현재의 기존 연구들은 testing 방법으로 cross validation을 이용하여 traffic classification을 수행하고 있으며, traffic flow를 기반으로 classification 결과를 제시하고 있다. 본 논문에서는 testing방법으로 cross validation과 split validation을 이용했을 때, traffic classification의 정확도 결과를 비교한다. 또한 바이트를 기반으로 한 classification의 결과와 flow를 기반으로 한 classification의 결과를 비교해 본다. 본 논문에서는 J48, REPTree, RBFNetwork, Multilayer perceptron, BayesNet, NaiveBayes와 같은 ML 알고리즘과 다양한 feature set을 이용하여 트래픽을 분류한다. 그리고 split validation을 이용한 traffic classification에 적합한 최적의 ML 알고리즘과 feature set을 제시한다. The methodology of classifying traffics is changing from payload based or port based to machine learning based in order to overcome the dynamic changes of application's characteristics. However, current state of traffic classification using machine learning (ML) algorithms is ongoing under the offline environment. Specifically, most of the current works provide results of traffic classification using cross?validation as a test method. Also, they show classification results based on traffic flows. However, these traffic classification results are not useful for practical environments of the network traffic monitoring. This paper compares the classification results using cross validation with those of using split validation as the test method. Also, this paper compares the classification results based on flow to those based on bytes. We classify network traffics by using various feature sets and machine learning algorithms such as J48, REPTree, RBFNetwork, Multilayer perceptron, BayesNet, and NaiveBayes. In this paper, we find the best feature sets and the best ML algorithm for classifying traffics using the split validation.

Albumin의 후향적 약물 사용 평가

홍주희,이영희,정선회,박경호,손인자 韓國病院藥師會 2004 병원약사회지 Vol.21 No.2

Albumin is used in hypovolemic shock, severe burns, acute hypoproteinemia, adult respiratory distress syndrome, and cardiopulmonary bypass. But the high cost of albumin relative to less expensive alternatives, such as nonprotein colloid(eg, hetastarch, dextran) and crystalloic solution (eg, lactated Ringer’s solution, various sodium chloride solutions), has intensified the debate surrounding the appropriate clinical use of resuscitation fluids. This study was performed to analyzed the appropriateness for albumin use and conducted through retrospective chart review of one hundred and seven inpatients who received albumin in Seoul National University Hospital for Aug. 2003. We applied the ASHP DUE criteria which is composed of justification of use, critical indicators, complications and outcome measures. As a result, 104 cases(59.1%) met with the criteria for justification of use. In analysis critical indicators, measurement of plasma albumin and total protein within 1 day before beginning albumin therapy and daily thereafter was acceptable 95 cases(54%). But administration rate adjustment could not observed, because of a lack of records. As an outcome analysis, plasma albumin and total protein after albumin administration was elevated in 85 cases(48.3%). Definite complications in albumin use were none. In this research the use of albumin showed adequate justification of use but low in the critical indicators except plasma albumin and total protein monitoring. The uses of albumin require improvement in monitoring for patients’general condition and fundamental therapy for hypoalbuminemia.

폐머리카락을 이용한 중금속의 흡착특성에 관한 연구

홍승목,정진희,장나영,김한석,이기형,김명숙,성낙창 동아대학교 환경문제연구소 2008 硏究報告 Vol.30 No.1

The current study conducted experiments for property analysis regarding heavy metal absorption, iodine adsorption and porosity using waste hair as a reclamation method of waste hair. The study also observed pore distribution of hair using a Scanning Electron Microscope(SEM) and examined the possibility of removing heavy metal from hair. That is, the purpose of the current study is to evaluate environmental risk and economical efficiency by comparing hair with other biomass resources, activated carbon, etc. heavy metal removal efficiency was analyzed wrule heavy metal concentration 10 ppm, time variables were 5min, 15min, 30min, 60min and 120min, temperature was 20 .C, and pH 3

마이크로 렌즈 어레이 금형의 가공특성에 관한 연구

정재엽,이동주,홍성민,제태진,이응숙 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-

Recently, the interest on micro optical parts has increased rapidly with the development of technology related to microsystems. Among the optical parts, micro lens is one of the most broadly used micro parts. To mass-produce the micro lenses, it is very effective to use the mold insert and injection molding process. There are many methods to fabricate the mold insert for micro lenses: electroforming, etching, mechanical micromachining and so on. In this study, we fabricated the mold insert for micro lenses using a micro ball endmill to apply mechanical micromaching method and analyzed the effect of main process parameters such as spindle speed, feed rate, dwell time on the processed surface. Then, using fabricated the mold insert we fabricated the micro lenses through injection molding process.

일산화탄소의 선택적 산화반응을 CuO-CeO_2 촉매의 개발

정창렬,한종희,남석우,임태훈,홍성안,이호인 한국공업화학회 2002 응용화학 Vol.6 No.2

CuO-CeO_2 catalysts were prepared by coprecipitation and used for selective oxidation of carbon monoxide in the presence of excess hydrogen and carbon dioxide. The catalysts were characterized by means of XRD, XPS and H_2-TPR. The CuO-CeO_2 catalysts exhibited high catalytic activity in selective oxidation of CO, showing markedly enhanced catalytic activities due to the solid solution of Cu-Ce-O. Only CeO_2 peaks were shown in all the catalysts, and as the increase of Cu loading, the lattice constant of CeO_2 (111) decreased.

폐머리카락을 이용한 중금속의 흡착특성에 관한 연구

홍승목,정진희,장나영,김한석,이기형,김명숙,성낙창 東亞大學校 附設 環境問題硏究所 2008 硏究報告 Vol.29 No.1

The current study conducted experiments for property analysis regarding heavy metal absorption, iodine adsorption and porosity using waste hair as a reclamation method of waste hair. The study also observed pore distribution of hair using a Scanning Electron Microscope(SEM) and examined the possibility of removing heavy metal from hair. That is, the purpose of the current study is to evaluate environmental risk and economical efficiency by comparing hair with other biomass resources, activated carbon, etc. heavy metal removal efficiency was analyzed wrule heavy metal concentration 10 ppm, time variables were 5min, 15min, 30min, 60min and 120min, temperature was 20 .C, and pH 3

금속-화합물반도체 접합에 대한 Parameter Sensitivity 분석

고정대,홍치유,최성은,정창섭 동국대학교 자연과학연구소 1986 자연과학연구 논문집 Vol.6 No.-

Cu(Ⅱ)이온과 Co(Ⅱ)및 Ni(Ⅱ)이온에 대한 선택적 안정 chelate제인 salicylaldoxim과 a-Nitroso-B-Naphthol 을 Friedel-Craft 반응에 의하여 Styrene-divinyl benzene 수지에 각각 또는 함께 부가시킨 이온교환수지를 합성하고 Cu(Ⅱ), Co(Ⅱ), Ni(Ⅱ) 및 Fe(Ⅲ) 각이온들에 대한 흡착특성을 조사하였다. Salicylaldoxim and a-Nitroso-B-Naphthol as chelate functional groups for the Cu(Ⅱ), Co(Ⅱ) and Ni(Ⅱ) ions were introduced by the Friedel-Craft reaction to the Styrene-divinybenzene bead and investigated its ion exchange capacity at variable pH.