• Journal of Plant Biology
• /
• v.23 no.3_4
• /
• pp.69-83
• /
• 1980

Distribution of the naturalized plants in Korea was studied, based on the references reported by many authors from 1895 to 1980 and on the data obtained by survey of the present authors on 200 localities, 170 overpopulated areas and 30 islands in various size, in South Korea. We could describe 110 species in 27 families, including the pre-1945 records in North Korea. In this paper 14 naturalized species were newly described. Naturalized plants were characterized by dominated annual and hemigeophytes, 75.5% and 17.3%, respectively, in Raunkiaer's life form spectrum. The authors proposed two indices, i.e., Relative Naturalized Degree (RND) and Urbanization Index (UI). Increasing UI values or numbers of the naturalized plants in various localities were showed the correlation to the urbanized degree or population size in their localities.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2001.11a
• /
• pp.199-202
• /
• 2001

This paper presents the correlation on the contamination degree and weather conditions using the multiple regression of the statistic method. The cotamination is a significant factor in the insulation system. The major factor is natural contamination, and the most is the salt. The salt contamination is occured by the weather conditions. The weather contaminations are wind, precipitation, temperature, relative humidity, etc. The effects of those are different, and the correlation is showed numerically by using the multiple regression method of the statistic method. With this, the estimation of the equivalent salt deposit density(ESDD) becomes possible by the changes of the weather conditions.

• Korean Management Science Review
• /
• v.20 no.2
• /
• pp.95-111
• /
• 2003

The standard issue in the information and telecommunication industry is increasingly important with the rapid development of technology. This paper proposes an index model which can measure the degree of standardization in the Korean information and telecommunication field. We first classified ICT sector into 14 sub-sectors. Then for each sub-sector, we considered a set of important determinants to measure the level of standardization, and constructed a linear equation using this set of determinants. Finally we estimated the relative degree of importance of each determinant using the AHP methodology. The proposed model found that overall level of standardization in the Korean ICT industry is relatively low, and ‘IMT-2000 technology’ and ‘computer network technology’ among 14 sub-sectors are highly standardized sub-sectors. The validity of the proposed model was also partially proved using two different methods, holistic and historical approach.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2003.11a
• /
• pp.103-106
• /
• 2003

This paper proposes an index model which can measure the degree of standardization in the Korean ICT field. We first classified ICT sector into 14 sub-sectors. Then for each sub-sector, we considered a set of important determinants to measure the level of standardization, and constructed a linear equation using this set of determinants. Finally we estimated the relative degree of importance of each determinant using the AHP methodology. The proposed model found that overall level of standardization in the Korean ICT industry is relatively low, and "IMT-2000 technology" and "computer network technology" among 14 sub-sectors are highly standardized sub-sectors, Finally, the validity of the proposed model was also partially proved using two different methods, holistic and historical approach.

• Journal of Families and Better Life
• /
• v.8 no.1
• /
• pp.15-30
• /
• 1990

The purpose of this study was to provide basic data for consumer complaining behavior. For this purpose, questionaire was given to 600 individuals who have resided in Seoul as the housewife consumer and possessed the experience to use the purchased refrigerators within the period of 5 years. 437 data were analyzed by the statistical methods like frequency, percentage, ANOVA, Duncan's Multiple Range Test, X2-test, Pearson's correlation and multiple regression analysis. The results of this study were described as follows; 1) Complaining behavior have shown significant differences according to housewife's age, degree of perceived housewife's consumer education, husband's job and housewife's job. 2) The type of attribution of dissatisfaction have shown significant differences according to husband's job, housewife's job and family income. 3) There was significant difference in the complaining behavior according to the type of causal attribution and responsibility attribution. 4) The complaining behavior was influenced by causal attribution of dissatisfaction, responsibility attribution of dissatisfaction, family income, degree of perceived housewife's consumer education, husband's job and housewife's age. And the relative contribution of each variable explaining the complaining behavior was decreased according to the order of variables that were described.

• The Transactions of the Korean Institute of Electrical Engineers P
• /
• v.61 no.1
• /
• pp.55-58
• /
• 2012

By using EEG and HRV, subjects were estimated on their psychological and physiological reaction when reading psychrometric chart in 7 point century font, in an environmental test room in the condition of temperature 25[$^{\circ}C$], relative humidity 50[RH%], air current speed 0.02[m/sec], giving variation in illuminance to 0.1, 300, 600, 1000, 1300 and 1600[lux]. As a result, it was at 1300[lux] that absolute ${\alpha}$ wave, SMR, SDNN were most vitalized, and also both sides ${\alpha}$ wave asymmetry index, SEF50, HRT, stress and fatigue degree were at the lowest. It was found that a certain illuminance which minimizes psychological stress and fatigue degree while enhancing concentration and task achievement stably does exist.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2000.04a
• /
• pp.641-646
• /
• 2000

A milling process with 45 degree chamfered inserts produces a perfect flat surface only in theory. It is due to many unwanted factors including thermal effect, dynamic effect, the problem of the controller used and the problem of accuracy of the machine tool. In this study, introduced is a method to improve the surface roughness by redesigning of the chamfer angle of the insert, which traditionally has been 45 degree. First, the relationship between the fixed machine coordinate and the relative coordinate on the insert is derived. This transfer matrix is used to determine the new insert angle to maximize the flatness of the machined surface. A newly designed insert is manufactured, and used to carry out the experiment. It is proved that the insert designed by the proposed method produced a much flatter surface than a traditional one.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2002.05c
• /
• pp.27-30
• /
• 2002

In this paper, we were investigated leakage current properties of outdoor insulator on climatic environmental factor. Contamination is one of the most important factor to determine the performance of insulator. Thus, it is very important to exam the contamination degree on the outdoor insulator. There are many limits, such as reliability of data, interval of measurement and similarity of environmental conditions, in conventional method. So, we measured phase and leakage current of outdoor insulator using the temperature & humidity chamber. In this investigation, phase difference was measured to compare the variance of phase difference with the contamination degree and relative humidity.

• Environmental Engineering Research
• /
• v.21 no.1
• /
• pp.74-83
• /
• 2016

The purpose of this study is to identify the driven factors affecting the changes in energy-related $CO_2$ emissions in Hebei Province of China from 1995 to 2013. This study confirmed that energy-related $CO_2$ emissions are correlated with the population, urbanization level, economic development degree, industry structure, foreign trade degree, technology level and energy proportion through an improved STIRPAT model. A reasonable and more reliable outcome of STIRPAT model can be obtained with the introducing of the Ridge Regression, which shows that population is the most important factor for $CO_2$ emissions in Hebei with the coefficient 2.4528. Rely on these discussions about affect abilities of each driven factors, we conclude several proposals to arrive targets for reductions in Hebei's energy-related $CO_2$ emissions. The method improved and relative policy advance improved pointing at empirical results also can be applied by other province to make study about driven factors of the growth of carbon emissions.

• Journal of the Korean Home Economics Association
• /
• v.34 no.4
• /
• pp.1-19
• /
• 1996

The purpose of this study is to clarify the tendency of impulse buying behavior and the consumer psychological characteristic factors which arouse impulse purchase and the difference in exploratory behavior according to the degree of impulse buying behaviors. For this purpose existing studies on impulse buying behaviors, consumer stimulation levels and exploratory behaviors were theoretically reviewed. And field survey was carried out for this study; 353 women impulse consumers were selected by convenience sampling method. The summarized main results of this study are as follows; 1) In relative perspectives, the consumers who has high degree of impulse buying behavior was favor of sensory buying behavior but, was lack of planned and rational buying behaviro. 2) The optimal stimulation level of high-impulse consumers is higher than that of low-impulse consumers. Especially, optimal stimulation level of impulse consumers is significantly higher than their life-style stimulation level. This means that impulse consumers are consider to a stimulation seeker. 3) The high-impulse consumers have high exploration through shopping, high information seeking behavior, high interpersonal communication level, high risk taking behavior and particulary high sensory exploratory patterns in purchase exploratory behaviors than that of low-impulse consumers.