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청소년의 구매 행동과 관련 변인에 관한 연구 : 강원 지역 중학생을 중심으로 Focused on the Middle School Students in Kangwon Province
조현주,최동숙 한국 가정과 교육 학회 2002 한국가정과교육학회지 Vol.14 No.1
The purpose of this study is to find out the level of purchasing behavior and related variables of Korean adolescents in Kangwon province, and to suggest a direction of consumer education for rational purchase and of Home Economics Education, through noticing the influence of socio-demographic variables and socialization-related variables. To find out the results of this study, a survey was made using questionnaires with middle school students who live in Kang-won province, and 472 questionnaires were used as the analysis data, The methods of statistical analysis used for this study were Grobach'α. Frequency Distribution. Percentile, mean. Standard Deviation, ANOVA, t-test. Duncan's Multiple Range Test. Multiple Regression Analysis, and also SPSS PC+ was used. The summaries of the results of this study were as follows. First, the level of the adolescents' purchasing behavior was the average 3.34 which is higher than the centered number 3. and the level of pre-purchasing behavior(3.36) was higher than that of the post-purchasing behavior(3.29). Second, the adolescents' purchasing behavior showed the significant difference according to the mothers' educational level and family income. Third, among the socialization-related variables, the group which had much communications with their parents and friends about purchase, the group which got much consumer education in school and their home, the group which can see much advertisements about purchase showed high level of purchasing behavior. Fourth, in the regression analysis, the consumer education in school, the communication with parents or friends were significant variables to the level of purchasing behavior. Looking into the subcategory, the communication with parents, the amount of pocket money, the father's occupation were significant variables to the level of pre-purchasing behavior. And the consumer education in school, the communication with parents or friends, the father's occupation were significant variables to the level of post-purchasing behavior.
조현욱,김명수,정은환,유재휘,윤병주 명지대학교 공학기술연구소 1986 공학기술연구소 논문집 Vol.1 No.-
One of protection methods for computer internal data is to pursue data flow in program and to control its flow. In this thesis, we propose a mechanism which guarantees secure information flow in a program. By investigating security classes of all the variables in a statement and judging necessary condition for secure information flow, proposed model descriminates the program whether it is secure or not. Out model can be implemnted at language translation time, particularly semantic analysis phase, by pursuing security class transfer of each statement.
( Ju-hyeon Lee ),( Geon-ju Lee ),( Thuy-linh Pham ),( Jong-sook Lee ),( Wook Jo ) 한국센서학회 2020 센서학회지 Vol.29 No.1
Dielectric capacitors are integral components in electronic devices that protect the electric circuit by providing modulated steady voltage. Explosive growth of the electric automobile market has resulted in an increasing demand for dielectric capacitors that can operate at temperatures as high as 400 ℃. To surpass the operation temperature limit of currently available commercial capacitors that operate in temperatures up to 125 ℃, Bi<sub>1/2</sub>Na<sub>1/2</sub>TiO<sub>3</sub> (BNT), which has a large temperature-insensitive dielectric response with a maximum dielectric permittivity temperature of 300 ℃, was selected. By introducing an intentional A-site cation deficiency and post-heat treatment, we successfully manage to control the dielectric properties of BNT to use it for high-temperature applications. The key feature of this new BNT is remarkable reduction in dielectric loss (0.36 to 0.018) at high temperature (300 ℃). Structural, dielectric, and electrical properties of this newly developed BNT were systematically investigated to understand the underlying mechanism.
Radical Scavenging Activities of Tannin Extracted from Amaranth (Amaranthus caudatus L.)
Jo, Hyeon-Ju,Chung, Kang-Hyun,Yoon, Jin A,Lee, Kwon-Jai,Song, Byeong Chun,An, Jeung Hee The Korean Society for Microbiology and Biotechnol 2015 Journal of microbiology and biotechnology Vol.25 No.6
This study investigates the bioactivity of tannin from amaranth (Amaranthus caudatus L.) extracts. The antioxidant activities of the extracts from amaranth leaves, flowers, and seeds were evaluated. Tannin from leaves of amaranth has been evaluated for superoxide scavenging activity by using DPPH and ABTS<sup>+</sup> analysis, reducing power, protective effect against H<sub>2</sub>O<sub>2</sub>-induced oxidative damage in L-132 and BNL-CL2 cells, and inhibition of superoxide radical effects on HL-60 cells. At a concentration of 100 µg/ml, tannin showed protective effects and restored cell survival to 69.2% and 41.8% for L-132 and BNL-CL2 cells, respectively. Furthermore, at the same concentration, tannin inhibited 41% of the activity of the superoxide radical on HL-60 cells and 43.4% of the increase in nitric oxide levels in RAW 264.7 cells. The expression levels of the antioxidant-associated protein SOD-1 were significantly increased in a concentration-dependent manner in RAW 264.7 cells treated with tannin from amaranth leaves. These results suggest that tannin from the leaves of Amaranthus caudatus L. is a promising source of antioxidant component that can be used as a food preservative or nutraceutical.