• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.73-73
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• 2017

가축의 영양소 요구량 유지, 비육, 증체, 생산, 번식, 계절환경에 따라 달라지는 변동요인을 감안하여 하루 동안에 필요로 하는 영양소 요구량을 충족하도록 여러 종류의 사료를 혼합한 TMR(Total Mixed Ration)사료의 중요성이 커지고 있다. 이에 가축의 생산성 향상(등급 향상)과 축산농가의 영농비용 절감, 생력화를 위해 범용적으로 사용가능한 TMR플랜트의 개발이 반드시 필요하다. 본 연구에서는 사료비절감을 위한 식품부산물 발효탱크의 개발을 통해 발효탱크 밑 부분을 구성하고 있는 스위프오거와 이를 고정하면서 Z축으로 회전하는 고정부를 대상으로 하여 시각화 할 수 있는 FEM 시뮬레이션 기법을 이용하여 작업 중 적용되는 하중에 대해 충분한 구조 안전성을 가지고 있는지 해석하였다. 스위프오거의 재질은 SM45C, 작용하는 하중은 감속기의 출력량, RPM을 이용하여 토크 값을 구하고 조사료와 부산물사료가 포함된 TMR사료의 무게와 스위프오거의 단면적을 이용하여 압력 값을 도출하였다. 하지만 부산물사료가 발효되면서 저장탱크를 통해 배출되기 때문에 전체 사료 무게가 줄어 스위프오거에 작용하는 압력 또한 작아지는 것을 확인하였다. 이에 본 연구에서는 저장탱크에서 TMR사료가 배출되기 직전의 가장 높은 압력 상태를 가정하였다. 이 가정을 통해 토크 값은 $1.4N{\cdot}m$, 압력 값은 43 Mpa으로 나타났고 이를 바탕으로 구조해석을 진행하였다. 그 결과 스위프오거는 고정단 부근에서 최대 폰 미세스 응력 310 Mpa이 발생하여 구조적으로 가장 취약한 것으로 나타났다. 하지만 이는 SM45C의 항복강도인 343 Mpa 보다 낮아 안전한 것으로 분석된다. 또한 사료가 배출되면서 스위프오거에 작용하는 압력이 작아져 폰 미세스 응력도 작아지는 것으로 나타났다.

• Journal of the Society of Disaster Information
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• v.16 no.2
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• pp.411-419
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• 2020

Purpose: This study is intended to improve the performance of traffic signs corroded by aging, to ensure maintenance efficiency, a water-hardened coating solution was developed. Performance tests were then used to determine the optimal component scale. Method: For research purposes, the results were analyzed by conducting corrosion resistance assessment, physical properties evaluation, storage safety assessment, etc. on coating solutions of various magnifications. Results: The analysis results showed that there was little hearing in the cutting area in the liquid with added magnesium, so the method effect was excellent. And there was little blister occurrence, which was analyzed at the highest magnification. Conclusion: Enhancements to future new component scale experiments are needed for water-hardened coating solutions that have been recognized for their performance through this study. And institutional improvement efforts are needed to expand the enforcement of traffic sign maintenance using coating solutions.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.12
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• pp.8195-8209
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• 2015

The purpose of this paper is to propose a method for recommendation and personalization of important news articles based on evaluating news value. Evaluation of news is the approach by which editors select news articles for cover-story in traditional offline news papers area. For this, my study proposes a suite of methods to select and personalize a set of news based on evaluating news articles, not just on the personal preference for them. The aforementioned the value of news articles including social impact, novelty, relevance to each audience, and human interest, all of which have been factorized in many previous studies, is a main concept for a procedural and structural application methodology deduced in this study. After a comparative case study with other online news services, it was shown that my research provides more effective way to select important news articles in terms of user satisfaction than others.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.04a
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• pp.415-416
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• 2010

Recently, development and using a range of natural gas is widening because anxiety of oil supply is increasing. Especially, around the world, development for Storage and transportation of natural gas is rapidly growing. On the other hand, in Korea because of technology loss for cryogenic part material, key component is rely on import. LNG and LPG are the future core of natural fuels. That are getting a lot of support and it have increased the frequency of use. So it should be associated with the development of technology. And key technology about design and manufacturing for cryogenic butterfly valve are secured. In this paper, we analyze the strength evaluation for circumference pressurization type cryogenic butterfly valve using the fluid-structure analysis.

• The Journal of Korean Academy of Prosthodontics
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• v.14 no.1
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• pp.41-46
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• 1976

The purpose of the current study was to investigate histologic changes in the alveolar bone of the lower molar region subsequent to the loss of their opposite molars, and to characterize chemical alterations by utilization of histochemical procedures. Twenty five rats(Sprague Dawley), approximately 150-200gm body weight, were used in this experiment. In the treated animals, upper molars were removed. The animals were decapitated by groups at the following intervals after teeth removals: 10th, 20th, 50th, 70th and 100th day. The normal, untreated rats were used as controls. The molar region of lower jaw, including the intact alvelar bone and teeth was dissected and specimens were decalcified in 3% formic acid. After the tissues were fully decalcified, the specimens were embedded in celloidin and sectioned in mesiodistal plane. These sections were stained in the following staining methods. Mallory azan stain and hematoxylin-eosin stain were utilized for structural evaluation. Polysaccharides were demonstrated by means of the PAS reaction. Acidmucopolysaccharides were studied by means of the colloidal iron stain. Alloxan-Schiff reaction was used for protein. The results were as follows: 1) In the control animals, bone resorption was noted in the distal alveolar bone proper and bone apposition was shown in the mesial alveolar bone proper. But in the treated animals, bone apposition was observed on the mesial and distal walls of the alveolus and osteoclastic activity was not noted in any walls. 2) Bone apposition was most prominent from the 10th to 20th day after treatment. 3) Appositional growth of cementum along the surface of root was prominent from the 50th to 70th day after treatment. 4) In the area where osteoblastic activity was apparent, osteoblasts were stained strongly in the PAS and alloxan-Schiff reaction. A plastic resorption line showed strong alloxan-Schiff reaction. 5) In the colloidal iron stain, the alveolar wall adjacent to the cementum apposition area was stained more strongly than the other areas.

• Child Health Nursing Research
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• v.12 no.4
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• pp.514-522
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• 2006

Purpose: The purpose of this study was to identify the factors of child behavioral problems and construct a descriptive model that explains child behavioral problems for school age children. Method: The participants in the study were 586 4th, 5th, 6th graders and their mothers. The children attended 8 elementary schools located in Taejon city and their mothers. The tools used in this study was the Mother's Child Raising Behavior Scale by Park, Seong-Yeon and Yi, Sook(1990). To measure child's self esteem, the Self Esteem Scale by Kim(1987) was used; child perceived social support was measured with the Social Support Evaluation Scale by Dubow and Ullman(1989), and childhood behavioral problems were measured with the Korean standardized of version of the Korean-Child Behavior Checklist(K-CBCL)(1997). Descriptive statistics and linear structural relationship(LISREL) modeling were used to analyze the data. SAS and LISREL 8.12a programs were used. Results: The overall fit of the hypothetical model to the data was good $>X^2=103.07(p=0.00)$, GFI=0.96, AGFI=0.94, RMSR=0.04, RMSEA=0.07, NFI=0.94, NNFI=0.95< Maternal child raising behaviors(T=2.21) and child perceived social support(T=10.29) had a significant, direct effect on a child's self esteem. Maternal child raising behaviors(T=-3.87), and child self esteem(T=-2.04) and had a significant total effect on child behavioral problems. These variables accounted for 63% of the variance of the child behavioral problems in the school age children. Conclusion: These finding have provided support for maternal child raising behaviors, child perceived social support, and child self esteem as predictive variables of behavioral problems in school age children.

• Korean journal of communication and information
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• v.62
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• pp.159-178
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• 2013

The current study examined the effects of the voters' perception of television news coverage of election poll results on their political participation intention. 700 voters participated in a telephone interview three weeks before the 2012 Korean presidential election. A structural equation modeling with the nationally representative sample was performed. The findings indicate the respondents were more likely to evaluate television news coverage of election poll results negatively when the news coverage presented that the candidate they supported was behind in the race, and the negative evaluation was linked to a greater third-person perception. The third-person perception, in turn, had an indirect effect on political participation intention through negative emotional responses. The results imply that voters' political position influences their perception of the television news coverage of election poll results, and this perception can have indirect effects on political participation.

• Journal of the Korean Recycled Construction Resources Institute
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• v.6 no.1
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• pp.66-71
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• 2018

In general, when an existing pier is enlarged and reinforced using a small diameter pile, bonded anchor with deformed reinforcing bars is used to maintain the integrity of the joint. However, in the case of bonded anchors, the performance depends largely on the type of joint material. Nevertheless, unlike mechanical anchors, there is no standard method for designing appropriate design methods and proper performance evaluation. Therefore, in this study, the performance of the anchoring anchor was evaluated by performing a model experiment using the reinforcing bars and anchor reinforcing bars. Experimental results show that the structural performance of the unbonded specimen is the best, and the failure mode is the punching shear failure. The deflection of the end of the member is smaller than that of the unconnected member, The deflection of the connected member is larger than the deflection of the small connected member. As the load increases, the possibility of slippage of the anchor steel or fold connection rebar is high.

• Culinary science and hospitality research
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• v.8 no.3
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• pp.91-106
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• 2002

To achieve these goals constituent dimensions and structural elements of the Japanese restaurants service quality are being investigated through the review of the food service industry and service. The survey about the importance and the Japanese restaurants was also conducted with a questionnaire to identify the tendency of customers who visited restaurants. These results and satisfactions hypotheses are being tested in the restaurant and the empirical research aye both conducted to achieve time research purposes. Japanese restaurants, located in the metropolitan area, are being selected as the object limits of the survey. Eighty-seven questionnaires are being distributed three kinds restaurants which means total 250 for all, and from which 230 are being analyzed. Frequency and $\chi$$^2$test were applied for the general matters and the conditions of object while Cronbach's Alpha coefficient and factor analysis were applied for reliability and validity. t-test was attempted to fine the importance and the satisfaction of the service quality. Also ANOVA was utilized. After examining the results of this survey, few facts were apparent. First the number of male ana female customers in the Japanese restaurants are divided evenly in about 55% of male customers and 45% of female customers. However, these people have a wide variety of jos. Another evident fact present on this survey shows that customers eating at a less expensive restaurants have a income of 1,000,000 won where as the expensive or high-end restaurants have customers with higher income than average. The price sensitive customers studied in this survey shows that they spend on average 30,000 to 70,000 won per person in the less expensive establishments. Therefore, with some service quality restructuring, application of new systems and ideas these restaurants could efficiently maximize their profit margin. Customers also showed that lower prices in lunch time would be an appealing incentive to deviate from standard lunch time 〈12:00~13:00〉and menu specials would be of interest to deviate from busy dinner time. In conclusion, since restaurants in the middle range category are not so many restaurants in lower range have a chance to maximize their profit. This study clearly shows that even the lower-end restaurants could raise their profit margin by incorporating new marketing techniques and by improving the service level of their restaurants.

• Journal of Families and Better Life
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• v.10 no.1 s.19
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• pp.139-156
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• 1992

The purpose of this study is to provide basic data for the solution of occupant problems related to the house purchasing. For the purpose, the content of problems and actual conditions of house purchasing are examined. Also the structural analysis of occupant's evaluation of housing purchasing is executed. For these purposes, a survey was conducted using questionnaires. Data analysis was conducted from 263 house owners in Seoul. Major findings of this study can be summarized as follows ; 1) The frequency and the contend of occupation's problems with house purchasing are studied. The rate of housing problem occurrence is 71.2%, so the majority of respondents experience problems. The most common problems are the difference from supplier's description(53.2%). The rate of housing problems occurrence is qenerally high with the houses of mult-housedhold houses and mult-family houses type. 2) There is a significant difference in housing satisfaction extend according to the existence of an housing problem experience. Therefore, it can be inferred that experience of housing problem has an important effects upon the housing satasfaction extent. 3) Occupants' countermoves to the housing problems are examined. Occupants make active regotiation with house suppliers only on the direct damages such as an economical loss or a living difficulty. However, they usually make no countermove at all on the other indirect troubles. House suppliers make correction only when occupants' countermove actively, but refuse to do when occupant's reactions are not active. 4) As a means of countermove, most occupants depend on direct personal regotiation with house suppliers. The rate of using a specialist or public and private consultant is extremely low. 5) Problems with house purchasing and the countermove process of both occupant and house supplier are displayed in the figure(Fig. 4-4).