인체 체액내 황색포도상구균의 증식과 철 획득 기전

신성희,이강길,이명희,양남웅,임용,김진호 대한감염학회 2000 감염 Vol.32 No.5

Drosophila melanogaster 韓國 自然集團에 있어서 P-M system에 依據한 系統型 轉換

成耆昌,崔喜慶,金溶聲 성균관대학교 기초과학연구소 1989 論文集 Vol.40 No.1

Isofemale lines of Drosophila melanogaster were established from Daejon in Korea and were examined in order to investigate the changes of cytotype or strain type by P-M system through 1∼15 generations. The results are as follows: 1. Using π_2 (strong P) strains and bw;st (true M) strains as standard strains, the mean sterility frequencies from Cross A were 20.8%∼34.6% for each generations and the mean sterility frequencies from Cross B were 0.0%∼0.3%. 2. Frequency of strain with P cytotype for each generation was analyzed to be 44.8%(G₁), 59.2%(G₂), 43.7%(G₄), 36.7%(G_7), 29.2%(G_10) and 36.7%(G_15). Therefore it was tend to be low as increased with generation number, but the differencies in percentage of GD sterility between each generation are non-significant statistically. 3. Among the isofemale lines, type conversions were observed. Q→M', M'→Q and M'→M changes have occured with frequency of 18.4%, 8.2% and 4.1%, respectively. The remaining lines (69.3%) were unchanged through several generations. 4. The results suggest that Drosophila melanogaster are appeared temporally as a certain strain type in natural population, but the type conversions were represented by interactions between P elements in each genome and cytoplasm for each generation.

反撥硬度法에 의한 高溫受熱콘크리트의 强度推定에 關한 實驗的 硏究

姜丙熙,張承宰 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2

The results both non-destructive test and compressive strength test, by rebound hammer testing method, to highly heated concrete are the inferential formula of compressive strength, as follows : (1) Air circuit leave for 24 hours after heating Fc= 7.53R-70.69 (2) Air circuit leave for one month after heating Fc= 7.62R-78.07

러프집합과 계층적 분류구조를 이용한 데이터마이닝에서 분류지식발견

이철희,최상철 강원대학교 정보통신연구소 2001 정보통신논문지 Vol.5 No.-

This paper deals with simplification of classification rules for data mining and rule bases for control systems, Data mining that extracts useful information from such a large amount of data is one of important issues. There are various ways in classification methodologies for data mining such as the decision trees and neural networks, but the result should be explicit and understandable and the classification rules be short and clear. The rough sets theory is an effective technique in extracting knowledge from incomplete and inconsistent data and provides a good solution for classification and approximation by using various attributes effectively. This paper investigates granularity of knowledge for reasoning of uncertain concepts by using rough set approximations and uses a hierarchical classification structure that is more effective technique for classification by applying core to upper level. The proposed classification methodology makes analysis of an information system easy and generates minimal classification rules.

Dextranase 함유 구강 세정액의 치태 제거 및 치은염 예방 효과에 관한 임상적 연구

송우성,손성희,정현주 전남대학교 치의학연구소 2001 구강과학 Vol.13 No.3

A novel glucanhydrolase (DXAMase) from a mutant of Lipomyces starkeyi (KSM 22) has been shown effective in hydrolysis of mutan, reduction of mutan formation by Streptococcus mutans and removal pre-formed sucrose-dependent adherent microbial film and DXAMase has been strongly bound to hydroxyapatitie. These in vitro properties of Lipomyces starkeyi DXAMase are desirable for its application as a dental plaque control agent. This study was performed to determine the adjunctive oral hygiene benefits and safety of dextranase (Lipomyces starkeyi KSM 22 DXAMase)-containing mouthwash when used alongside normal toothbrushing. This 6-month clinical trial was placebo-controlled double-blind design evaluating 1U/㎖ dextranase mouthwash and 0.12% chlorhexidine mouthwash. A total 39 systemically healthy subjects, who had moderate levels of plaque and gingivitis were included. At baseline, 1, 3 and 6 months, subjects were scored for plaque accumulation(Turesky modification of Quigley-Hein's plaque index), gingivitis status (Lo¨e and Silness gingival index), and tooth stain(Area and severity index system by Lang et al). Additionally, oral mucosal examinations were performed and subjects questioned for adverse symptoms. Two weeks after pre-experiment examinations and a professional prophylaxis, the subjects were provided with allocated mousewash and instructed to use 20-ml volumes for 30s twice daily after toothbrushing. All the groups showed significant increase in plaque accumulation since 1 month of experiment. During 6 month's period, the Dextranase mouthwash group showed the least increase in plaque accumulation, compared to the Chlorhexidine mouthwash and placebo groups. As for gingival inflammation, all the groups showed significant increase during 6 months of experiment. The Experimental group (Dextranase mouthwash) also showed the least increase in gingival index score, compared to the Positive control (Chlorhexidine mouthwash) as well as the Negative control (placebo) groups. Whereas the tooth stain was increased significantly in the Positive control group, compared to the baseline score and the Negative control group since 3 months of mouthrinsing. It was significantly increased after 6 months in the Experimental group, still less severe than the Positive control group. As for the oral side effect, the Experimental group showed less tongue accumulation, bad taste, compared to the Positive control group. From these results, mouthrinsing with Lipomyces starkeyi KSM 22 dextranase provided adjunctive benefits to toothbrushing, comparable to 0.12% chlorhexidine mouthwash in inhibition of plaque accumulation and gingival inflammation and local side effects were if anything less frequent and less intense than chlorhexidine, with long-term use of the mouthwash. All data had provided positive evidence for Lipomyces starkeyi KSM 22 dextranase as an antiplaque agent and suggested that further development of dextranase formulations for plaque control are warranted.

조건부수급자의 자활사업 참여와 불참간 의사결정 요인분석

이성희,원종욱 한국사회복지정책학회 2004 사회복지정책 Vol.20 No.-

본 연구는 조건부수급자증 자활사업 불참자의 특성을 자활사업 참여자와 비교하여 분석함으로써 어떠한 요인들이 이 두 집단을 구분짓게 마는지 실증적으로 규명하는데 그 목적이 있다. 조건부수급자중 정당한 사유 없이 자활사업에 불참한 사람들의 특성에 대한 과학적인 분석은 자활사업이 안고 있는 참여율 저조 문제에 대한 원인을 이해하고, 향후 성공적인 자활사업 시행을 위한 정책수립에 기초자료가 될 것으로 사료된다. 이를 위해 『2003 자활정책평가와 개선과제 실태조사』 의 자료를 이용하여 조건 부수급자증 자활사업 참여자와 불참자에 대찬 설문분석과 함께 자활사업 참여결정에 영향을 미치는 요인을 계량적으로 분석하였다. 설문분석 결과 자활사업 불참자는 참여자에 비해 상대적으로 남성의 비율이 높고, 연령은 낮고, 동거 가구원수가 많으며, 학력이 높고, 소득수준이 놓으며, 담당공무원이 자신의 소득수준을 정확히 파악하지 못한다고 생각하는 편으로 나타났다. 자활사업 참여결정에 영창을 미치는 요인을 probit model로 추정한 결과 역시 설문분석 결과의 타당성을 뒷받침하였다. 그리고 자활사업 불참자의 소득 추정식을 분석한 결과 수급자 가구가 근근이 생활하는데 필요하다고 생각하는 금액이 클수록, 즉 기본적인 생활수준을 높이고 싶은 욕구가 강할수록 민간 노동시장에서 얻는 소득수준도 높아지는 것으로 나타났다. The main purpose of the study is to identify the differences in socio-economic variables between participants and non-participants of the public self-reliant program. Under the 『Law of the Guaranteeing Basic Livelihood』, those who are physically fit to work, are classified as conditional recipients. One of the condition applied to them is to participate in the public self-reliant program when they can't find job. By analyzing the survey data of 2003, we found out that there are differences in socio-economic variables between two groups. Other things controlled, men are more likely to not to participate in public self-reliant program rather they chose to work in private labor market. Age is another factor influencing decision on participation of the program. The younger recipients are more likely to work in private labor market rather than public self-reliance program. We also found out that those who believe that real incomes are less likely to be revealed by government social workers are more likely to participate private labor market rather than government program. Finally, we predicted income level that non-participants could earn in the private labor market by utilizing Heckman selection model(two-stage). Even though average income of the non-participants' of the public program was about to 420,000 Won the predicted private market income of the total conditional recipients are close to only 200,000 Won. It implies that public self-reliant program is vital source of income for the recipients who possess labor capacity but are unfit to competitive private labor market.

국내 해안 연약지반의 점토광물 분포 및 공학적 특성

임희대,이상규 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.2

These studies were carried out to investigate the characteristics of alluvial clay deposits distributed in the main coastal areas. Also we can use their outcomes which were analyzed from the soil test results surveyed during the latest for the purpose of design, construction and maintenance of civil engineering structures to be built in these areas in the future. Samples of clay minerals were analyzed using an X-ray diffraction test. Also, the geotechnical properties of the distribution of clay minerals were evaluated after collection physical and mechanical soil data. The results of Siroquant analysis though X-ray diffraction analysis show that natural water content, liquid limit., initial void ratio, compression index, and compression ratio are positively proportional th the amount of montmorillonite, whereas they are inversely proportional to those of illite and kaolinite. In addition, dry unit weight, unconfined compressive strength, and cohesion are inversely proportional to the amount of montmorillonite, and positively proportional to the amount of illite and kaolinite. In particular, the amount of montmorillonite is closely related to geotechnical characteirstics. However, it is considered that the relative composition ratio, physical and chemical characteristics of other clay minerals have influence on marine soil characteristics with montmorillonite, since the amount of montmorillonite is less than other clay minerals.

아파트 외벽색체 계획을 위한 환경색체 평가연구

조성희,염진옥 부산대학교 가정대학 1993 家政大學硏究報告 Vol.19 No.-

The importance of home-environment evaluation has been increased in terms of user comfort and needs. The design principles of architectural color for home environments are needed for the planning of exterior color of apartments. This study attempts to find out the evaluation criteria and their characteristics for the exterior color of apartments. For this purpose, the field survey has been carried out to investigate the exterior color and usage patterns and user's satisfaction for exterior color of apartments based on 369 households living in 12 apartment compounds built in Pusan according to environmental settings (mountain area, seaside area, and mass building area). The evaluation criteria for exterior color of apartments such as the fitness of the home, the harmony with settings and the aesthetic were developed and analyzed based on the ratings of 369 subjects. Therefore, this study as an empirical assessment of the evaluation criteria developed for home environmental color as appropriate concepts for exterior color of home environment can contribute to color planning for apartment exteriors.

전처리 과정과 모델 선택을 이용한 비선형 시계열 데이터의 퍼지 예측

이철희,윤상훈 강원대학교 정보통신연구소 2001 정보통신논문지 Vol.5 No.-

When time series data have the non-probabilistic uncertainty and the nonlinear characteristics, time series forecasting using traditional techniques is very difficult. Especially, traditional methods, which use past data directly in prediction procedure, cannot properly handle non-stationary data whose long-term mean is floating. To cope with this problem, a fuzzy forecasting method combined with the data preprocessing and model selection procedure is suggested in this paper. The proposed method is divided into the two phase. One is modeling phase, and the other is prediction phase. First of all in modeling phase, based on correlation analysis, we determine which sequences of differences of original time series data is more suitable for forecasting. Then, for each sequence of differences chosen from data preprocessing, fuzzy predictor with TS rule base is constructed. Finally an optimal predictor which yields the minimal MSE is selected. In prediction phase, we perform forecasting by a fuzzy predictor selected in modeling phase. Computer simulations show that the proposed method have better performance than traditional method for nonlinear time serves data.

비선형 시스템 제어를 위한 퍼지 PID 제어기의 설계 및 해석

이철희,김성호 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.B

Although Fuzzy Logic Controller(FLC) adopted three terms as input gives better performance, FLC is in general composed of two-term control because of the difficulty in the construction of fuzzy rule base. In this paper, a three-term FLC which is similar to PID control but acts as a nonlinear controller is proposed. To reduce the complexity of the rule base design and to increase efficiency. a simplified fuzzy PID control is induced from a hybrid velocity/position type PID algorithm by sharing a common rule base for both fuzzy PI and fuzzy PD parts. It is simple in structure, easy in implementation, and fast in calculation. The phase plane technique is applied to obtain the rule base for fuzzy two-term control and the resultant rule base is Macvicar-Whelan type. And the membership function is a Gaussian function. The frequency response information is used in tuning of the membership functions. Also a tuning strategy for the scaling factors is proposed based on the relationship between PID gain and the scaling factors. Simulation results show better performance and the effectiveness of the proposed method.