• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.07a
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• pp.347-352
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• 2003

농산물 포장화물의 경우 농산물의 손상은 겉포장 상자의 파손에 의한 압상이 주요 원인이다. 따라서 농산물 상자의 경우 압축강도를 특히 중요시 여기고 있으며, 한국산업규격을 비롯해 각종 농산물 관련 규정에서는 압축강도에 의한 상자의 품질관리를 규정화 하고 있다. 골판지 상자의 압축강도는 원단인 골판지의 구성 원지들(라이너, 골심지)의 품질과 이들의 구성 형태 및 상자의 외형 치수 비율에 따라 결정되므로, 원지의 링크라쉬(ring crush), 원단의 수직압축강도(edgewise compression strength)를 통해 상자의 압출강도를 관리하는 것이 보통이다. 또한 골판지 상자는 제작 후 유통 과정을 거치면서, 여러 요인에 의해 압축강도가 현격하게 저하되는데, 이중 수분 흡습에 의한 강도저하와 장기 누적하중, 진동 및 충격 등의 피로로 인한 강도 저하가 가장 크다. 여러 산업 분야에서 골판지 상자의 견고성 문제는 물품의 내수 및 수출시 제품에 대한 신뢰성 확보와 기업의 이미지 제고와 직결되는 중요한 사항이다. 특히, 세계 각 국의 농산물 시장이 개방됨에 따라 우리나라 농산물의 수출도 확대될 전망이고 또한 마땅한 대체재가 개발되지 않는 한 골판지 상자의 이용은 날로 증가될 것으로 전망된다. 따라서 골판지 상자의 압축강도와 내구성 향상에 대한 다각적인 연구가 절실하다. (중략)

• Water for future
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• v.45 no.3
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• pp.51-58
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• 2012

수문조사시설은 하천의 이 치수 및 환경 기능을 향상시키기 위한 구조적인 대책과 비구조적인 대책을 수립할 때 귀중하게 이용되는 수위자료를 취득하기 위한 기본적인 시설임에도 불구하고 아직까지 선진 외국에 비해 고품질의 수위자료를 생산하기 위한 인프라 시설 및 연구결과가 부족하다는 평가를 받고 있다. 이에 하천 수문관측의 주변 환경 여건변화에 따라 낙동강홍수통제소가 관리중인 수문조사시설의 현황조사 및 개선방안을 제시하여 신뢰도를 제고하고, 이전 수위자료와의 연계방안 등을 제시하여 수위자료의 정확도를 확보하는데 있으며, 개정된 하천법에 맞는 수문조사시설 관리대장을 체계적으로 DB화하여 편리하고 신속하게 대국민 및 관련 업무담당자에게 제공하는 정보체계를 수립하였다.

• Fashion & Textile Research Journal
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• v.6 no.3
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• pp.399-403
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• 2004

Education of clothing and textiles in the university is various according to the purposes. Among that clothing construction and practice is what is needed the most in understanding the process of apparel producing, and is the basic subject of areas from apparel designs to quality management. Producing apparel starts from planning the bodice pattern according to the human body shape. Basic bodice pattern should be highly practical so that production of all items of apparel patterns can be possible. Also, a basic bodice pattern needs to be planned in the way that even beginners can use it by classifying sizes according to each body measurements. Thus in this study. bodice patterns will be produced in way of draping method subjecting university students in early 20s. standardized and classified sizes will be calculated from it and bodice pattern made by studied flat pattern method will be examined and compared so that finally suitability will be compared. As a result of examining and comparing bodice patterns made by draping method and studied flat pattern method on the model of the human body produced by plaster method, sizes were classified into 5 levels. As a result of evaluation of creation. satisfying consequence from various body shape was acquired and it is expected of the beginners who are stating from clothing construction and practice to be educated by using the result of this study.

• Journal of the Society of Disaster Information
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• v.13 no.3
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• pp.366-375
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• 2017

Internal factors having effects on compressive strength test results of concrete include size, shape, height-diameter ratio(h/d), section processing method, dryness and wetness, etc. of the specimen. As it is difficult to ensure dimensions of core specimen due to rebar cutting from rebar spacing, wall thickness, effects on the structure, etc. when taking core of the concrete structure, correction of dimensions and h/d of the specimen become important for quality control of the concrete. Thus, in order to review effects of specimen size and height-diameter ratio for the concretes with compressive strength within 40~60MPa, this study has experimentally reviewed compressive strength test values by applying correction factors pursuant to KS F 2422 (Method of obtaining and testing drilled cores and sawed beams of concrete), when changing specimen diameter to ${\emptyset}5{\sim}15cm$, and h/d to 2.0~1.25.

• The KIPS Transactions:PartD
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• v.11D no.3
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• pp.577-590
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• 2004

Today, the growth of software industry leads to e quantitative expansion of software package products. Due to this rapid increase of software package products, qualify certification has been required fur software products which users select. Unlike the quality certification of industrial products, the history of software product certification has not been so long. For this reason, software quality evaluation and certification methods have not matured yet. When certifying software products, one of most important factors is the systematic generation of evaluation sets. The evaluation sets include checklists with metrics, and criteria for the software quality certification according to the classification of software product type. This paper presents a metamodel for the systematic generation and maintenance of the evaluation sets. Then, we construct prototype level evaluation sets to show the validity of the metamodel.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.118-118
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• 2017

4대강 사업으로 인하여 장래 치수 및 물부족현상과 가뭄에 대비한 용수 확보를 위해 하도준설과 보의 설치, 중소규모댐 건설, 농업용저수지 증설 등이 진행되었다. 그중 낙동강에는 8개 대형보가 건설되었다. 하지만 보 건설로 인하여 주변 지역 지하수위가 상승하여 주변 농경지나 저지대가 침수될 가능성이 있어 4대강 사업의 문제점의 하나로 지적되어 왔다. 이에 본 연구에서는 낙동강 유역에 건설된 보로 인하여 상승한 하천수위가 보 주변지역에 미치는 영향을 알아보기 위하여 8개보 주변의 연구대상지역을 선정하고 지하수 모델(Visual-MODFLOW)을 이용하여 보 관리수위 및 함양량 변화에 따른 지하수 유동과 지하수 변화를 분석하였다. 각 연구대상지역별 지하수위 변동특성 분석 순서는 보 건설 후(현재상태)에 대하여 정류상태 보정을 실시한 후 보 관리수위 시나리오를 정하고 그에 따른 분기별 함양량을 적용하여 부정류 모의를 실시하였다. 그 결과 각 연구대상지역의 지하수위는 낙동강 하천수위와 비슷하게 형성되는 것으로 평가되었으며, 낙단보의 경우 분기별 지하수위 변화가 0.1m ~ 0.2m로 함양량 변화에 따른 지하수위 변동이 가장 작게 평가되었다. 상주보의 경우 분기별 지하수위 변화가 1.5m ~ 2.1m로 함양량 변화에 따른 지하수위 변동이 가장 큰 것으로 평가되었다. 이러한 지하수위 변화는 하천주변 농가의 재배 작물 수확량 및 품질에 직접적인 영향을 줄 수 있어 농번기인 2분기(4월 ~ 6월)와 4분기(10월 ~ 12월)의 경우 보 관리수위를 주변 재배작물에 따라 운영한다면 보 건설로 인한 주변 지하수위 상승으로 인한 영향을 최소화 할 수 있을 것으로 판단된다. 향후 한강, 금강, 영산강에 건설된 보 주변에 대한 지하수위 변화특성 연구가 필요할 것으로 판단되며 본 연구 결과를 바탕으로 보 관리수위 결정의 기초자료로 활용할 수 있을 것이라 판단 된다.

• Magazine of the Korea Concrete Institute
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• v.9 no.2
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• pp.145-151
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• 1997

In concrete mix design we need the informations of the codes, the specifications, and the experiences of experts. However we can't consider all factors regarding concrete mix design. The final acceptance depends on concrete quality control test results. In this process we meet the uncertainties of materials. temperature, site environmental situations, personal skillfulness. and errors in calculations and testing process. Then the mix design adjustments must be made. Concrete mix design and adjustments arc somewhat complicated, time-consuming. and uncertain tasks. In this paper, as a tool to minimize the uncertainties and errors the neural network is applied to the concrete mix design. Input data to train and test the neural network are obtained numerically from the results of design following the concrete standard specifications of Korea. The 28-days compressive strengths which are variate according to the uncertainties and errors are considered. The results show that neural networks have a strong potential as a tool for concrete mix design.

• Journal of the Korean Geotechnical Society
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• v.31 no.10
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• pp.37-47
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• 2015

Recently, the quality of drilled shafts concrete has been improved significantly due to the improved concrete performance, upgraded concrete materials, and better management of on-site constructions. Despite the development, current conventional quality management on concrete constructions is still used without any criticism. In this study, compressive strength test results of more than 200 concrete specimens after 7 and 28 days of curing were collected from one site at Songdo area of Incheon. The concrete specimens were prepared from the concrete with aggregate maximum dimensions of 25 mm, target compressive strength of 40 MPa, and slump of 180 mm. Influential factors including concrete temperature, air temperature, amount of slump, amount of air, amount of salinity on concrete specimen were also examined. The database was established from collected information and statistical analyses were performed. Analyzed results confirm that "the difference between concrete temperature and air temperature" has the largest impact on the compressive strengths of specimens at the durations of 7 and 28 days.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.541-544
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• 2008

Recently, due to the increase of high-rise buildings construction, many researches for making harden of concrete earlier and remove of forms faster are being performed to reduce construction period. The purpose of this study is to analysis which mixing condition and curing temperature of early strength concrete. Porperties of concrete by the different factors, such as the type of active admixtures, mineral admixtures, curing temperature, the amount of binder, etc. Through the test of concrete using the different type of admixture, PC type was more excellent than PNS type admixture. The concrete Strength remarkably will be able to confirm that decreases from temperature below 12$^{\circ}C$.

• The Journal of Engineering Geology
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• v.26 no.4
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• pp.439-445
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• 2016

The new airports apply the systematic runway foundation construction to build the high quality runways in order to take the leading position to win future aerial demands and stay ahead of competitors. This study is intended to supplement the weakness of existing standard compaction test to minimize residual settlement of lower weak foundation during operation of passenger berthage. The fill material was sampled from 4 construction sites using the fill material with diameter of 100mm or less, and the standard compacting test (KS F 2312), large circular mold compacting test, and water-replacement field density test (ASTM D 5030) were conducted. The regression analysis of correlation of the field density test and the standard indoor compaction test showed the unreliable value at P-value of 0.05, and the regression analysis of the field density test and the large indoor compaction test showed the high correlation with R value of 0.8878. It is judged that the construction of overall uniform quality can be assured as the site condition is truly reflected only if the compacting test method is selected in consideration of maximum size of fill material when evaluating the maximum dry density used in design and construction.