• Journal of the Korean Data and Information Science Society
• /
• v.24 no.2
• /
• pp.245-255
• /
• 2013

The object of study is to propose a method for grouping R, F, and M in RFM model. Our model uses 6 levels using standard normal distribution. First level is upper 2.5% and second level next 13.5%, third level next 34%, fourth level next 34%, fifth level next 13.5%, sixth level next 2.5%. Values are symmetric and limits are clear. We compare proposed model with traditional 5 level model and 10 level model using NDSL data of KISTI. Proposed model divides most clearly the distribution of the RFM function for all cases of weights, because it uses the distribution of customers. Comparison studies of our model with grouping using cluster analysis and studies on weights of RFM model are needed.

• 한국지구물리탐사학회:학술대회논문집
• /
• 2009.10a
• /
• pp.54-59
• /
• 2009

Seismic station of high noise level has difficulties detecting relatively weak ground motions due to small earthquakes or teleseismic events because earthquake detectability of seismic station depends on seismic noise level. To figure out the capability of earthquake detection of a seismic network, therefore, seismic noise level of each station also needs to be considered, including the distribution of seismic stations. Recently, it has been known that most of broadband seismic stations in South Korea have affected by cultural noise in the frequencies higher than 1 Hz and show diurnal variations of noise level. In order to analyze the effect of diurnal variation of seismic noise level on earthquake detectability, we used the result of background seismic noise level analysis of seismograms of 30 broadband stations of KIGAM and KMA from 2005 to 2007. This study shows that earthquakes greater than magnitude 2.4 occurring within the Korean Peninsula can be detected at night while those greater than magnitude 2.6 can be detected in the daytime.

• Journal of KIISE:Software and Applications
• /
• v.34 no.1
• /
• pp.18-29
• /
• 2007

In this paper we present a system that classifies brain MR images by using 2 level decision tree learning. There are two kinds of information that can be obtained from images. One is the low-level features such as size, color, texture, and contour that can be acquired directly from the raw images, and the other is the high-level features such as existence of certain object, spatial relations between different parts that must be obtained through the interpretation of segmented images. Learning and classification should be performed based on the high-level features to classify images according to their semantic meaning. The proposed system applies decision tree learning to each level separately, and the high-level features are synthesized from the results of low-level classification. The experimental results with a set of brain MR images with tumor are discussed. Several experimental results that show the effectiveness of the proposed system are also presented.

• Journal of the Korean Dietetic Association
• /
• v.12 no.1
• /
• pp.1-9
• /
• 2006

This study was intended to investigate and analyze the satisfaction of military meals service which was recognized by air force soldiers who were familiar to the society's meals service, and to make suggestions for the analysis results. For the study, the questionnaire survey was conducted for 460 air force soldiers who performed military duties in Chungcheong area for 23 days from June 3, 2003 to June 26, 2003. Total 460 copies of questionnaire were distributed. But, among them, 431 questionnaires except 29 copies which included dishonest and untrustful answers were analyzed for the study. In terms of the soldiers' rank in demographical characteristics, 43.2% (186 respondents) of total respondents were the airman first class, and 29.7% (128 soldiers) of total respondents were the airman second class. In terms of an education level, 66.1% (285 respondents) of total respondents had the undergraduate school or higher education level. Also, in terms of the growth area, 56.8% (245 respondents) of total respondents came from large cities. Among 20 items about the military meals service, in the question of cooking soldier's kindness degree, respondents answered that they were satisfied with the cooking solders' kindness at a medial level. The survey showed the average 2.95 in this item. The satisfaction level of actions taken at the lack of foods, was 2.94 on the average. Respondents answered that the soldiers' satisfaction on the actions taken at loss of foods was in the medial level. The average was 2.94 and respondents answered that this satisfaction was in the average level. In the item of daily menu placement, the average was 3.19. respondents showed the little higher satisfaction than the average. As the result of investigating whether the castor's seasoning materials were frequently replaced, there was the satisfaction of average level with 3.00 on the average. The satisfaction level of hot foods' temperature was 3.52 on the average. Respondents answered that they were relatively satisfied with the hot foods' temperature preservation. Also, the survey indicated that the nutritional satisfaction had the most influence.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.22 no.3
• /
• pp.23-28
• /
• 1986

This paper describes on the measurement of the deck vibration produced by the main engine vibration of stern trawler MjS SAE-BA-DA (2,275GT, 3,600PS) while the ship is cruising and drifting. The obtained results are as follows; 1. The deck vibration level was the highest point at vertical line which pass main engine and the lowest point at vertical line which pass top bridge while the crusing. 2. The vibration source level of the main engine, screw shaft and screw propeller were respectively 110, 90 and 80% while the crusing. 3. The main deck vibration pressure level at the check points 2, 20, 30, 40, 60, 70, 80, 86m from the bow to stern was respectively 9, 8, 7, 10, 22, 45, 18, 23%. 4. The frequency distributions of the rr.ain engine, screw shaft, screw propeller vibration were from 3 Hz to 10 KHz, predominant frequency was 1 KHz, each vibration accelration the highest level were respectively 1. 3, 0.8, 0.5 $mm/s^2.$ 5. The predominant frequency distributions of the main deck, second deck, bridge deck and top bridge deck-s vibration were from 10 to 30 Hz, and each vibration accelration level were respectively 0.7, 0.05, 0.07, 0.04 $mm/s^2.$

• The Korean Journal of Applied Statistics
• /
• v.8 no.2
• /
• pp.55-64
• /
• 1995

Three-level Skip-lot sampling plan split by two stages (Split2-SkSP0 is proposed by modifying multi-level skip-lot sampling plan proposed by Choi(1993), which has normal and terrace inspections on the first and the second stages, respectively. The plan is designed to work more higher level inspections when the quality of the submitted products are good, otherwise, return to the normal or the terrace inspection as fast as possible. Also, the formula of the operating characteristic function for the split skip-lot sampling plan is derived using the Markov chain approach. Also, operating characteristic properties of the proposed plans are studied and graphically compared with those of the multi-level skip-lot sampling plans.

• Journal of the Korean Society of Safety
• /
• v.14 no.4
• /
• pp.158-167
• /
• 1999

In parallel flow condition, to estimate the stability of the extended embankment constructed on a permeable foundation ground, a laboratory model test was performed due to extended materials and water level increasing velocity of a flood period. A laboratory model test was peformed for different permeability coefficients ($K_1=2.0{\times}10^{-5}cm/sec,\;K_2=1.5{\times}10^{-4}cm/sec,\;K_3=2.3{\times}10^{-3}cm/sec$) using seepage. The fluctuation of water level occurring to an extended embankment was analyzed by laboratory model tests as vary the increasing velocity of water level with 0.6cm/min, 1.2cm/min, 2.4cm/min respectively. In analysis results, the increase of water level into embankment occurs rapidly because seepage water moving along with a permeable soil flow into embankment. The larger the permeability coefficient of an extended part is the longer initial seepage distance, and the exit point of downstream slope is gradually increased and then shows unstable seepage behavior as occurring partial collapse. As the increasing velocity of water level increase, the initial seepage line is formed low, and the discharge increases. Therefore, the embankment extended by a lower permeable soil than existing embankment shows stable seepage behavior because an existing embankment plays a role as filter for an extended part.

• Journal of Korean Academy of Rural Health Nursing
• /
• v.8 no.2
• /
• pp.65-73
• /
• 2013

Purpose: The purpose of this study was to identify the relationship between intention to use advance directives and level of death anxiety in community-dwelling elders. Method: The participants were 200 older adults who were aged 60 or over and attended the community welfare centers. The level intention to use advance directive was measured by a questionnaire that was developed by the authors for the study. The measure by Kraus and Ellisond was administered to evaluate the level of death anxiety. Result: The average score for intention to use advance directives was $2.05{\pm}0.88$ and that of death anxiety was $6.2{\pm}2.28$. There were significant differences in the intention to use advance directives according to education levels and individual properties. Although there was no significant relationship between the intention to use advance directives and the level of death anxiety, they were negatively associated. Therefore, older adults who had lower death anxiety would tend to use advance directives. Conclusion: It would be necessary to screening the level of death anxiety to promote use of the advance directives. In addition, education programs for advance directives would be essential to consider about advance directives for their end-of-life especially for the community-dwelling elderly in Korea.

• Journal of the Korean Society of Costume
• /
• v.66 no.2
• /
• pp.1-14
• /
• 2016

This study was intended to investigate the influences that consumer's price sensitivity, bundle discount type, and price level of the male cosmetics have on consumer attitude. The design of this research was comprised of $2{\times}2{\times}2$ mixed design studies. The first element was high price sensitivity vs. low sensitivity, the second element was the bundle discount type (mixed leader vs. mixed-joint), and the third element was the price level of male cosmetics (high-price brand vs. low-price brand). The results of this study showed that price sensitivity, bundle discount type and price level of male cosmetic had a statistically significant interaction effect on the consumer's quality perception. The quality perception of low-cost brands for high price sensitivity/mixed-joint bundle group was low. The quality perception of low-cost brands for mixed-leader bundled groups did not change significantly even when the price sensitivity became higher. However, it can be seen as the same result that the overall value is higher when suggested the price information in Mixed-leader bundle than Mixed-joint bundle. In particular, this study suggests that price information should be presented in mixed-leader bundles for high price sensitivity and low cast brands.

• Journal of Korea Fishing Vessel Association
• /
• v.29
• /
• pp.15-20
• /
• 1986

This paper describes on the measurement of the deck vibration produced by the main engine vibration of stern trawler MIS SAE-BA-DA (2,275GT, 3,600PS) while the ship is cruising and drifting. The obtained results are as follows; 1. The deck vibration level was the highest point at vertical line which pass main engine and the lowest point at vertical line which pass top bridge while the crusing. 2. The vibration source level of the main engine, screw shaft and screw propeller were respectively 110, 90 and 80% while the crusing. 3. The main deck vibration pressure level at the check points 2, 20, 30, 40, 60, 70, 80, 86m from the bow to stern was respectively 9, 8, 7, 10, 22, 45, 18, 23%. 4. The frequency distributions of the main engine, screw shaft, screw propeller vibration were from 3Hz to 10KHz, predominant frequency was 1KHz, each vibration accelration the highest level were respectively 1.3, 0.8, 0.5mm/$S^2$. 5. The predominant frequency distributions of the main deck, second deck, bridge deck and top bridge deck's vibration were from 10 to 30Hz, and each vibration accelration level were respe¬ctively 0.7, 0.05, 0.07, 0.04mm/$S^2$.