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강희용,양성모,김봉철,임재중,용부중 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1
Cochlea is well known to have the ability to analyze a wide frequency and this ability seems to be caused to the Basilar Membrane(BM) configuration. However, the relationship between the Cochlea frequency-position map is not clear. In this paper, the three-dimensional BM model was made using the Finite Element Method. Then, an attempt was made to examine the influence of the BM configuration on the Cochlea frequency-position map.
강혜숙,남은우,박성빈,최재임 고신대학교 영도발전연구소 2000 영도연구 Vol.2 No.-
The purpose of this study was to grasp the sex knowledge in middle and high school students in Youngdo-Gu, Busan, and to provide some basic data for the needs and the direction of sex education for the teenagers. The survey was conducted by using questionnaires in two middle schools and two high schools in Youngdo-Gu. The questionnaires were took back after record by the respondents. The survey was conducted at September 15∼17, 2000 and a total of 791 were completed. The respondents were 200 (25.3%) males and 199 (25.2%) females in middle schools and 196 (24.8%) males and 196 (24.8%) females in high schools. For the statistical analysis, χ2-test, t-test and one-way ANOVA were used by using SPSS/PC+ WIN 8.0 program. The conclusions based on the results obtained from this study are as follows: 1) An attitude of the sexual matters showed that boys, students and non-christians were more progressive than girls, parents and christians, respectively (p<0.01). 2) The sexual agonies of students were in order of having a date 36.2%, sexual drive 11.1%, sexual intercourse 8.8%, masturbation 8.6% and sexual abuse 6.7%. 3) The points for sexual knowledges appeared 40.6 points out of 100 points from boys and 42.3 points from girls in middle schools, and 57.3 points from boys and 66.1 points from girls in high schools. Therefore, the girls had much knowledges on sexuality than those of the boys. There were a significant differences of knowledge on sexuality between boys and girls (p<0.001). Over 60% of both boys and girls had not enough knowledges on sexually transmitted diseases (STDs). 4) Satisfaction of sex education was common or unsatisfied as over 90% of respondents. The reasons were a textbook-like general information (50%) and nothing practically to help (29%). 5) The students wanted sex education for the practice in future life such as male and female relationship with etiquette(23%); and pregnancy and delivery (17%) in middle school students, and contraceptive and abortion (34%) and preventive STDs (18%). There was not enough to understand whole adolescent in Youngdo area because the study subjects were only public middle and hight school students in Youngdo-Gu, Busan. Conclusively, it is necessary to educate to give right information of sexuality to the adolescents in Youngdo, and to have systematically sex education from the kindergartens to the high schools by long range sex educational program. Also, a proper program for integrated sex education is necessary to build healthful sexual consciousness and worth in cooperation with sex educators, universities and health centers.
AFB 공정을 이용한 양돈폐수의 혐기성전처리에 관한 연구
강호,김종원,송석헌,이현규,장제헌 忠南大學校 環境問題硏究所 2003 環境硏究 Vol.21 No.-
This research was performed to optimize the anaerobic pretreatment of slurry type swine wastewater for the subsequent nitrogen and phophorus removal. Step-wise increases in Organic Loading Rate(OLR) and decreases in Hydraulic Retention Time(HRT) were utilized in Upflow Anaerobic Fixed Bed(AFB) reactor at mesophilic temperature(35℃). The maximum methane prodution rates of 1.16 v/v-d was observed at an HRT of 12 hours. TCOD removal efficiency of 75% at an HRT of 2 days and 41% at an HRT of 12 hours were obtained respectively. It is likely that the influent COD concentration of 3,000 mg/L for the subsequent biological nutrient removal system could be supplied from the anaerobic pretreatments operated at an HRT of 12 hours(OLR 12g CODL-day). During AFB operation alkalinity showed 800- 1,500mg/L as CaCO_(3) at all HRTs. It could play an important role for compensating pH drop caused by nitrification. The COD/TKN ratio of 6-14 at all HRTs, COD/TP ratio of 30-50 at an HRT of 1 day and proper buffering capacity and pH of the effluent from the anaerobic fixed bed could be adequate substrate condition in the following nitrogen and phosphorus removal. In conclusion, when AFB was operated at an HRT less than 1 day, the system could be optimized to reach an efficient anaerobic pretreatment for swine wastewater and the subsequent biological nutrient removal.
DNA minor groove에 결합하는 tallimustine (FCE 24517)의 DNA 염기서열 특이성 결합
제강훈,이종순 嶺南大學校 基礎科學 硏究所 1998 基礎科學硏究 Vol.18 No.-
Tallimustine (FCE 24517) is an alkylating benzoyl mustard derivative of distamycin A. The antibiotic distamycin A is DNA minor groove binding agent that recognizes a stretch of at least four ATs. Tallimustine, like distamycin A, is expected to bind preferentially to AT-rich sequences in the minor grove of B-DNA. In this study we have determined covalent binding sites of tallimustine using heat-induced strand cleavage assay. The result shows that tallimustine alkylates alkylates the N3 adenine in the sequences ??(underline indicates the alkylation sites). In spite of the presence of a benzoyl nitrogen mustard group this compound fails to alkylate the N7 position of guanine, the major site of alkylation by conventional nitrogen mustards. It is clear that the alkylated adenine N3 is found only in the hexamer ?? sequences, suggesting that tallimustine has high base and sequence specificities in the minor groove of DNA.