• Advances in materials Research
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• 제13권2호
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• pp.115-128
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• 2024

Concrete is the most significant material in the construction industry which is required to construct several facilities like roads, buildings, and bridges etc. which leads to the economic development of a country. But now days, in view of sustainable development and environmental problems, plastic waste management is one of the major environmental issues due to its non-biodegradable nature which allows it to stay in the landfills until they are cleaned up. To overcome all these concerns, plastic waste may be used as a substitute of natural fine and coarse aggregate in concrete and a valuable solution to utilize the plastic items which causes several problems. In order to, present study is focused on the affecting properties of concrete as workability, compressive strength, and tensile strength of concrete with using plastic waste and without using plastic waste. Based on the detailed literature, it was observed that the plastic waste is not affecting the quality and consistency of concrete. However, as the number of PVC particles in the mixture increased, the drying shrinkage values decreased and the inclusion of plastic flakes can mitigate drying shrinkage cracking which leads the higher durability of concrete. Based on the comprehensive literature, it was also observed that the plastic aggregate found to be suitable for low and medium strength concrete. However, the investigation on the application of plastic aggregate in the high strength concrete is found limited. It was concluded that the optimum percentage of the plastic aggregate was found about 20%.

• 콘크리트학회논문집
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• 제25권3호
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• pp.295-304
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• 2013

초고성능 콘크리트(UHPC: Ultra-High Performance Concrete)는 최근 국내외에서 연구가 가장 활발한 분야 중 하나로서 구조물의 장수명화와 경제성 제고에 기여하고 있다. 품질관리 및 공사기간 단축을 위해서는 공장에서 제작된 프리캐스트 방식의 초고성능 콘크리트가 유리하지만, 이 경우에도 프리캐스트 세그먼트 간의 이음부 등 부득이 현장타설로 시공되어야 하는 부분이 존재한다. 그러나 현장타설 시에는 공장 제작 시와는 달리 최적의 양생 조건을 구현하기 어려울 가능성이 크다. 따라서 이 연구에서는 현장에서 예상되는 여러 가지의 열악한 양생 조건을 가정하였을 때 초고성능 콘크리트의 압축강도 발현 경향을 실험적으로 규명하였다. 양생온도, 양생 전 지연시간, 양생 지속시간, 수분 공급 조건을 변수로 두어 공시체를 제작한 후 표준적인 고온습윤양생으로 제작된 공시체의 강도와 비교하였다. 실험 결과를 분석하여 현장에서 타설된 초고성능 콘크리트를 양생할 때 요구되는 최소한의 조건을 제안하였다. 이 연구를 통해 초고성능 콘크리트의 현장에서의 활용도를 더욱 높일 수 있을 것으로 기대된다.

• 한국생활과학회지
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• 제7권1호
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• pp.247-266
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• 1998

The purposes of this study were to investigate problems related to quality of life and to identify residents needs for the university educational program for the community residents. The data were analyzed by using $x^2$-test, F-test and multiple range test. Findings of this study provided some useful implications to develop educational programs for community people. These implications are as follows. In the aspect of home management, the need for education about time management was relatively high and the degree of time conflicts was varied to family size, educational level of house, housewife's employment status and outside work time. In the program area of economic life, education for enhancing ability to cope with unexpected events and impulsive consumption behavior, and education for money management technique and value clarification should be included. There were significant differences in the parents' role difficulties according to mother's age and income. Especially parents' role difficulties were children's social emotional development and educational activity. The major problems in management of clothing and textile products were the change of textile sensation, the poor quality of necessaries, and discoloration. This result suggests that education programs on management of clothing and textiles should be developed. In health and food management it showed that subjects were afraid of cancer, hypertension, cerebral vascular diseases in relation with food habits. Hence program of education for health and good food habits should be developed.

• 한국산학기술학회논문지
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• 제21권9호
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• pp.458-465
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• 2020

인공지능의 기술적 진보는 통신·물류·보안·의료 등 다양한 산업분야에 영향을 미치고 있으며, 경제성·효율화·상용기술과의 연계방안과 관련된 연구개발이 중점적으로 이루어지고 있다. 국방 분야에서도 다차원 동시 통합전, 유·무인 복합전, 국지성 비대칭전 등 전쟁수행 개념이 발전함에 따라 전장인식·지휘통제·전력운용·의사결정 지원 등의 분야에 인공지능 역량을 적용하기 위한 개념설계와 실적용을 위한 과제 기획을 지속 추진 중이다. 전략적 관점에서 미래 전장 환경 및 전쟁 수행 방식의 변화를 예측하고, 선도적 대응을 위해 군사력 발전 방향을 설계·기획하는 것은 포괄적 미래 위협에 대비하기 위한 기본요소일 뿐만 아니라, 한정된 예산/시간 대비 최적의 효율을 도출할 수 있다는 점에서 필수불가결한 요소이다. 이러한 관점에서 본 연구는 국방 분야의 활용 가능성이 높은 잠재력 있는 미래기술을 발굴하고 연구개발에 적용하기 위한 기술주도형 기획의 일환으로 수행되었다. 본 연구에서는 국방 미래기술 조사를 위해 수행되었던 연구 자료를 바탕으로 기존 국방 연구과제들과의 중복성, 기술의 실현가능성 등을 고려하여 후속 연구가 필요한 미래 신기술을 예측하였다. 또한 선정된 인공지능 분야 국방 미래 신기술과 평가지표 간 유의미성을 확인하기 위해 실증연구를 수행하였다.

• 산경연구논집
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• 제5권2호
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• pp.29-35
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• 2014

Purpose - The study aimed to evaluate the market opportunities and constraints confronting resource-poor pig farmers in South Africa. Research design, data, and methodology - Information was collected from 292 households in three municipalities through interviews with key informants. The data collected included socio-economic characteristics, major market channels, prices for different pig classes, average weight of the pigs on sale, number of pigs sold annually, and preferred meat quality attributes. Results - In Ngqushwa, 96% of respondents sold pigs as compared to Elundini (81%) and Ntabankulu (65%). Less resource-poor households and those with market-oriented production had large herdsizes (P < 0.05) when compared to more resource-poor farmers. The probability of selling pigs was high for the backyard production system and educated farmers. For all farmers, opportunities included high pork demand, good prices, employment creation, and a niche market for organically produced indigenous pork. Constraints include disease, feed shortages for large herds, distances to formal markets, lack of training, and drugs. Conclusions - Constraints outnumbered opportunities for the resource-poor pig farmers.

• 대한치위생과학회지
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• 제3권2호
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• pp.51-58
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• 2020

Oral examination ensures early detection and treatment of oral diseases and improvement of quality of health-related life. This is imperative as it reduces individuals' dental medical expenses and social costs caused by diseases. However, as the low oral examination acceptance rate continues to be a problem, this study was conducted to identify the factors that influence the oral examination of an economically active population. In this study, 4,836 economically active individuals between the ages of 20 and 65 years were studied using data from the 7th National Health and Nutrition Survey in 2018. Logistic regression analysis was performed to determine the factors influencing demographic and sociological characteristics on oral examination after adjusting for complaints of mastication and speech discomfort. As a result of confirming the factors influencing the oral examination, increase in age tended to be inversely proportional to the oral examination. Income level, type of job, and job position were identified as factors that influenced oral examinations. Compared to the group with a high socioeconomic status, which is represented by a group with a high income level or a stable job type or job position, the group with low economic status was found to have a negative effect on oral examination. Oral management of vulnerable groups, who might not be considered while devising oral health management policies, should be promoted through the development and provision of oral health management policies that consider employment status and environment.

• 산업경영시스템학회지
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• 제4권4호
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• pp.43-61
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• 1981

Interest in the Quality of working life is spreading rapidly and the phrase has entered the popular vocabulary. That this should be so is probably due in large measure to changes in the values of society, nowadays accelerated as never before by the concerns and demands of younger people. But however topical the concept has become, there is very little agreement on its definition. Rather, the term appears to have become a kind of depository for a variety of sometimes contradictory meanings attributed to it by different groups. A list of all the elements it if held to cover would include availability and security of employment, adaquate income, safe and pleasant physical working conditions, reasonable hours of work, equitable treatment and democracy in the workplace, the possibility of self-development, control over one's work, a sense of pride in craftsmanship or product, wider career choices, and flexibility in matters such as the time of starting work, the number of working days in the week, Job sharing and so on altogether an array that encompasses a variety of traditional aspirations and many new ones reflecting the entry into the post industrial era. The term "quality of working life" was introduced by professor Louis E. Davis and his colleagues in the late 1960s to call attention to the prevailing and needlessly poor quality of life at the workplace. In their usage it referred to the quality of the relationship between the worker and his working environment as a whole, and was intended to emphasize the human dimension so often forgotten among the technical and economic factors in job design. Treating workers as if they were elements or cogs in the production process is not only an affront to the dignity of human life, but is also a serious underestimation of the human capabilities needed to operate more advanced technologies. When tasks demand high levels of vigilence, technical problem-solving skills, self initiated behavior, and social and communication skills. it is imperative that our concepts of man be of requisite complexity. Our aim is not just to protect the worker's life and health but to give them an informal interest in their job and opportunity to express their views and exercise control over everything that affects their working life. Certainly, so far as his work is concerned, a man must feel better protected but he must also have a greater feeling of freedom and responsibility. Something parallel but wholly different if happening in Europe, industrial democracy. What has happened in Europe has been discrete, fixed, finalized, and legalized. Those developing centuries driving toward industrialization like R.O.K, shall have to bear in mind the human complexity in processing and designing the work and its environment. Increasing attention is needed to the contradiction between autocratic rule at the workplace and democratic rights in society.n society.

• International Journal of Computer Science & Network Security
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• 제22권9호
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• pp.95-102
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• 2022

The article considers the fundamentalization of education in improving the future specialists professional training with usage of multimedia technologies by various scientists. Various points of view and approaches to defining the concepts of fundamentalization of education and multimedia technologies are identified. The concept of fundamentalization of professional training of a future specialist is based on the goals and functions of fundamentalization and - on the ways and means of achieving it, etc. Most authors agree only in their views that the fundamentalization of education is aimed at improving the quality of education and the education of the individual. Others involve the formation of a culture and worldview, increasing the creative and intellectual potential, forming the professional competence of a specialist and the potential for further education, and so on. The term multimedia refers to interactive systems that provide processing of moving and still video images, animated graphics, high-quality audio and speech. It is found out that professional training of a specialist by means of multimedia technologies includes not only the activities of the teacher and student, which form the learning process, but also the independent activity of the subject, self-development, assimilation of experience by the subject through analysis, comprehension and transformation of the field of activity in which he is included. It is revealed through the implementation of which approaches to the fundamentalization of higher professional education, it becomes possible to fully present theoretical training courses and effectively pass practical training by students, which contributes to improving the quality of training of future specialists in higher education institutions. Theoretical analysis of scientific views indicates a fairly serious attention of scientists to the problem of professional readiness of specialists and the possibility of higher educational institutions in preparing for it. At the same time, professional readiness is considered from different positions: as an active state of a person, which manifests itself in activity; as a result of activity; as goals of activity; as a quality that characterizes the attitude to solving professional problems and social situations; as a prerequisite for purposeful activity; as a form of activity of the subject; as an integral formation of personality; as a component of socio-professional culture; as a complex professionally significant neoplasm of the individual.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1999년도 추계 학술대회지
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• pp.102-144
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• 1999

The major problems of food crop cultivation in Korea are low yield of most crops except rice. inefficient cultivation techniques for aged farmers. and low international competibility. Therefore, development of cultivation techniques of food crops should aim the yield. quality improvement, labor reduction and production cost. The primary issue for increasing the yield of soybean, barely and wheat is to reduce the yield gap between the farmer's yield and recommended ones of experiment station. More advanced cultivation techniques needs to be developed. and/or the conventional breeding methods to be reconsidered. The newly developed labor-saving mechanized technique needs to reduce labor hours , and the cost of agricultural implements and machineries. In other words the labor-saving mechanized technique should be developed based on the improvement of total farming system as well as systemic fundamental innovation of cultural methods. The efficiency of solar energy use in food production of Korea in 1997 is as low as $0.52{\%}$ so there is much room to increase yield. It is recommendable that the concept of food Production should be changed to energy Producing efficiency Per unit area basis from volume and weight of food materials. Moreover, introduction of resonable cropping system is needed to increase yield of main crops, farmer's income, solar energy use efficiency, and decrease of land service expenditure. Current cropping system emphasized on economic crops. especially in vegetables , is not desirable for resonable use of arable land. stability of agricultural management and staple food crop self-sufficiency ratio. It is desirable to increase food crops . that are energy of carbohydrate and protein rich and land dependent crops. in cropping system. And the agronomist should develop the cultural methods to replace food crops for food self-sufficiency and stable farming management instead of economic crops in current cropping system. Low-input and environmentally-sound crop cultivation techniques, especially nitrogen-reducing culture technique which is directly related to food crop quality, also needs to be developed urgently. The extended cultivation of corn in upland and barely and wheat in lowland as a feed stuffs is recommended to prevent further decrease of food self-sufficiency ratio, which is mainly caused by the high reliance on imported feed grain. It is also considered that the calculation and presentation methods of standard agricultural income needs to be improved. The current calculation method uses unit land area of 10a regardless of crop kinds , characteristics of agricultural management and cultivation scale. So, it is apt to lead misunderstanding of farm income value. Therefore. it should show an income of average farmers for certain number of years. Research and developing system for food producing is not desirable because they are conducted currently individual crop and mono-culture basis. But actual agricultural income is usually earned by cropping system including upland and lowland. For example. the barley and wheat is usually cultivated in double cropping system. The cooperation among research institutes such as university agribusiness. government and farmers is indispensible. The public information and education on importance and consumption habit of food crops is necessary in Korean society to increase food self-sufficiency through nationwide cooperation.

• Journal of the Korean Data and Information Science Society
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• 제25권3호
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• pp.533-545
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• 2014

경북지역의 한우농가를 대상으로 한우 사육실태와 육종개량에 대한 농가들의 인식도를 조사 분석하여, 앞으로 사육 기술지도와 한우개량 방향을 개선하는데 기초자료로 이용하고자 설문조사하여 분석한 결과는 다음과 같다. 후보번식우 선발은 '외모, 체형, 혈통등록우' (39.0%)를 고려하여 선발하였으며, 번식우의 종부방법은 '계획교배를 통한 인공수정' (38.6%)을 실시하고 있어 가장 높게 나타났다. 비육밑소 구입시 외관상 가장 관심을 두는 부분은 '체장' (40.7%)부분으로 나타났고, 비육 밑소의 거세는 '생후 6~7개월'이 가장 많이 실시하였고, 한우고급육 생산을 위하여 '고급육생산 프로그램에 준하여 80% 이상 맞춰준다' (51.7%)고 하였다. 그러나 농가들은 비육출하 월령은 '생후 28개월' (35.2%)이 가장 경제적일 것이라고 생각하고 있었다. 이러한 결과는 조사항목에 따라 다소 차이가 있긴 하지만 대체로 조사대상자의 일반적 특성에 따라 학력, 연령, 직업, 가족 노동력에 따라 유의수준 0.05에서 통계적으로 유의한 차이가 있었다. 그러나 비육 후 출하 시에 육질 1+등급 이상 출현율은 '출하두수의 30% 정도' (22.1%)라고 응답하여 가장 높았지만, 조사대상자의 알반적 특성 간에는 유의한 차이가 나타나지 않았다.