• Korean Journal of Agricultural Science
• /
• v.47 no.2
• /
• pp.263-273
• /
• 2020

With the change of the agricultural environment (increased rice production, decreased rice consumption, and rice production policies), converting paddy fields into upland fields is an increasing trend. In terms of conversion into upland fields, subsurface drainage is one of the most important factors for good field crop growth. This study evaluates the performance of a subsurface drainage culvert system in paddy fields and reclaimed lands. The obtained results are briefly summarized as follows: 1) After a comparative evaluation of several subsurface drainage culvert systems, including excavated subsurface drainage and non-excavated subsurface drainage types, type 3 (non-excavated, perforated drain pipe 50 mm, filter mat B50 cm, subsoiling 70 cm and culvert spacing 5 m) shows relatively high values among four types in terms of effectiveness (subsurface discharge capability) and economic efficiency (construction cost). 2) Type 3 has proven that it is suitable for design standards of discharge capacity through field tests performed in paddy fields (three sites: Gong-geom, Gae-san, Juk-san) and reclaimed lands (two sites: Gum-ho, Mi-am). 3) In the experiment of Sesamum indicum growth according to the existence of a drainage system, Sesamum indicum growth with a subsurface drainage culvert system had good value in terms of plant shoot and root length, shoot fresh and dry weight, and root fresh and dry weight).

• Hwankyungkyoyuk
• /
• v.20 no.1
• /
• pp.42-61
• /
• 2007

This study investigated the effect of the environmental issue analysis instruction on the decision making ability of middle school students. A pretest-posttest control group design was employed. The participants for the research were 288 1st grade male students in middle school in Seoul, the environmental issue analysis lesson group consisted of 142 members and the non-environmental education group consisted of 146 members. The cognitive level of the students were divided into three groups-concrete, transition, formal-as the result of GALT test. Students take issue analysis lessons during 6 weeks, one lesson per a week. Students had studied through worksheets reconstructed and developed by researcher on basis of issue analysis suggested by Ramsey et al. (1997). The results of the research were followings: After lesson for environmental issue analysis, all of the students were improved in decision-making ability regardless of cognitive level (p<.05). Especially, decision-making ability of the transition group students was improved to a high degree. Scores of searching relevant information, generation of alternatives, identification of values for selection criteria, the evaluation of alternatives' merits and demerits, prediction of consequence were increased in experimental group (p<.05). But the ability of selection of alternatives according to value was not reached statistically meaningful improvement. The decision-making ability of the control group students was not improved but ability of selection of alternatives, the evaluation of consequence were increased (p<.05).

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.15 no.2
• /
• pp.914-922
• /
• 2014

This study was to investigate sociocultural attitude toward appearance, body image, and self-esteem predict the appearance management in middle and high school girls. A descriptive compare design was used with self-report questionnaires, which were completed by 384 subjects. Data was analyzed with t-test and regression. There were statistically significant differences in sociocultural attitude toward appearance (internalization, awareness), body image (appearance evaluation, appearance orientation, body area satisfaction), and appearance management (weight management, cloth management, face management) between the two groups. Regression analysis revealed sociocultural attitude toward appearance (internalization, awareness) and appearance orientation of body image were predictors of appearance management in middle school girls. The significant predictors of appearance management for high school girls were body image (appearance evaluation, appearance orientation, body area satisfaction). The study gives new suggestions that there is necessary different methods to educate and council for appearance management in middle and high school girls.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.23 no.5
• /
• pp.13-22
• /
• 2019

In order to evaluate the earthquake damage level of small and medium - sized bridges without earthquake monitoring system, we proposed an algorithm for estimating the seismic force at the target bridge location using the ground acceleration data from the earthquake observatories near the structure. In general, response spectrum analysis, which is the most widely used dynamic analysis method to design and evaluate the structural system numerically is required a response spectrum to determine the dynamic loading. In this study, selection methods of the three closest observatories from the target structure and estimation method of ground response spectrum at arbitrary locations are developed. The proposed method can consider the distance and phase between the target bridge and the seismic station and from the relationship between the acceleration amplitudes and the location of the selected seismic station, the earthquake loading of the target bridge can be determined. The proposed algorithm is estimated to be more conservative than the response spectrum evaluated by actual earthquake data.

• The Korean Journal of Franchise Management
• /
• v.11 no.1
• /
• pp.31-44
• /
• 2020

Purpose: The baby boomers and the millennials, who make up the largest share of the market, are showing the gap in their differentiated cultural styles. The purpose of this study is to study the consumption propensity and purchasing determinants of the baby boomers generation and the millennials generation, which have become a very important key pillar in shaping the market based on the cultural dimension model theory of h(=>H)opstead, and to identify the difference Research design, data, and methodology: In order to verify the research hypotheses, The data was collected from the baby boomers and the millennials using online questionnaires. The pre-test was conducted from October 10 to 12, 2019, and the main survey was conducted from October 15 to 25. A total of 230 copies were recalled, and the final 219 copies were used for the final analysis. Results: The consumption propensity between the baby boomers and the millennials differed in resource saving purchase propensity and impulse buying propensity. The baby boomers showed higher resource saving purchase propensity than the millennials, while the millennials showed higher impulse buying propensity. There was a difference in the determinants to purchasing only in the evaluation factor. Results of gender differences by generation, baby boomers differed in their planned purchase propensity, and women were higher. The millennials generation differed in resource saving purchase propensity and awareness propensity for others, all higher in men. In determinants to purchasing, the baby boomers did not differ in gender, and the millennials did differ in product factors. A canonical correlations analysis of the relationship between the baby boomers and the millennials showed a significant relationship between consumption propensity and determinants to purchasing. Also, the baby boomer generation has the biggest link between impulse buying propensity and evaluation factor. The millennials generation showed the biggest link between resource saving purchase and product factors. Conclusions: This study compared consumption propensity and determinants to purchasing of baby boomers and millennials on the basis of Hopstead's cultural dimension model theory to identify differences between generations, presenting practical and theoretical implications for establishing a correct understanding and specific marketing strategy among generation.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.24 no.1
• /
• pp.77-82
• /
• 2020

As Korea enters an aging age, social efforts to improve the IADL of the elderly are increasing. In this study, to improve the performance of financial management activities that the elderly is particularly burdened, we aim to learn the elderly through ATM simulation education contents so that they can use ATM smoothly. To this end, interviews were conducted with seniors to derive four major financial activities (deposits, withdrawals, deposit inquiries and bank account arrangements), and developed tablet PC-based ATM education contents identical to the existing bank ATM interfaces. The experiment was conducted on 20 elderly people in the Elderly Day Care Center, and their satisfaction, fatigue and performance were measured before and after education. The results of this study can provide ATM design guidelines for the elderly who have difficulty using ATM.

• Journal of Family Relations
• /
• v.22 no.4
• /
• pp.81-105
• /
• 2018

Objective: The purpose of this study was to analyze how couples relationship education (CRE) programs in Korean scholarly journals have been developed since they first appeared in 1994. Method: We selected articles that were published in journals related to human ecology and that included information about how the authors developed CRE programs (premarital education, marriage education). Using coding schemes based on the theoretical frameworks of CRE, we quantitatively coded programs in four specific areas: (a) overall characteristics, (b) program planning, (c) program construction and implementation, and (d) program evaluation. Results: Although CRE programs have increased and evolved since the 1990s, the literature has been limited on testing long-term program efficacy, developing dissemination plans, and applying theories to program design. In terms of program participants and content, most programs had similar themes despite their differences in the target audience. We also found that few programs have been provided for diverse couples. As for evaluation, pre- and post-testing was the most common method of efficacy test. Conclusion: Our findings suggest that family researchers and practitioners develop more elaborate and systematic programs to advance CRE in Korea as a core topic of family life education and to provide evidence-informed practice.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.26 no.3
• /
• pp.403-411
• /
• 2022

A motion-based sports game uses a motion sensor or a camera to exercise based on body movements, and it is possible to obtain exercise effects such as improving physical strength while enjoying the game. In prior works, various studies such as usability evaluation has been conducted on motion-based sports games. However, there has been no discussion about how the exercise effect is exerted on users when experiencing motion-based sports games as individual or team play. This study compared the user's exercise effects by analyzing the user's ECG (Electrocardiogram) sensor and the Kinect sensor's skeletal information using Nintendo Switch game that is played individually and as a team. In this paper, the experimental design and method, the quantitative measurement results based on ECG and Kinect, and the results of the post-test subjective measurement are discussed.

• Journal of the Korea Institute of Building Construction
• /
• v.22 no.5
• /
• pp.507-518
• /
• 2022

The purpose of this research is to obtain experimental data for developing a structural design of an external insulation system by evaluating the shear performance of a composite insulation system according to the adhesive type. The shear performance of the composite insulation system was experimentally evaluated by considering a simultaneous placement method, full and spot/edge coverage using adhesive mortar. As a result of the test, the shear strength of simultaneous placement and full coverage method was almost similar, the spot/edge coverage method was about 80% of them. Also, the simultaneous placement method is considered to be constructively advantageous when applied as an external insulation system to a high-rise building compared to using an adhesive mortar.

• Journal of Drive and Control
• /
• v.20 no.2
• /
• pp.40-46
• /
• 2023

Fresh corn, one of the main food crops, must be harvested by hand. A harvest mechanization technology is required. In this study, a tractor-attached harvester was designed and manufactured to sequentially perform stem reaping, fresh corn detaching, and collecting. The(harvester was designed so that the main device could operate through a hydraulic pump and a generator could be operated through the tractor's PTO. Factor tests were conducted according to cultivars (Ilmichal, Super sweet corn) and working speed (0.12 m/s, 0.17, 0.22). After the factor test, detached corns ratio, collected corns ratio, and damaged corns ratio were analyzed and harvest performance was evaluated. Harvesting performance was good for super sweet corn. Considering operation efficiency, 0.22 m/s was judged to be an appropriate working speed. It was found that it took two hours to work an area of 10 a.