• 한국도로학회논문집
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• 제6권4호
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• pp.1-12
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• 2004

본 논문은 상온상태의 폐아스팔트 포장재료를 가열재활용하여 기층용뿐만 아니라 표층용으로 활용함에 있어 재생 아스팔트 바인더의 특성을 연구한 것이다. 4종류의 RAP을 가지고 RAP 자체의 기본 물성을 시험하였다. 배합설계는 표층에는 RAP을 10, 20%를 첨가하였고, 기층에는 10. 20, 30%를 첨가하였다. 재생혼합물의 신규바인더로는 AC 60-80을 선정하였다. 침입도, 점도, GPC, TFO. 저온균열 저항성을 평가하기 위한 BBR 실험을 수행하였다. 절대점도와 GPC에서의 대형입도분자(LMS)를 지수함수 회귀분석을 통해 $R^2$이 0.95 이상이었고 이것은 절대점도 추정에 GPC 결과가 상당히 정확함을 시사해주고 있다. RAP을 첨가한 재생 아스팔트 바인더의 PG 저온 등급은 일반 신규 바인더에 비해 한 단계 높은 등급을 나타내므로 저온균열에 대한 저항성은 약간 약한 것으로 나타났다.

• Molecules and Cells
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• 제37권4호
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• pp.307-313
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• 2014

Cell migration requires a defined cell polarity which is formed by diverse cytoskeletal components differentially localized to the poles of cells to extracellular signals. Rap-GAP3 transiently and rapidly translocates to the cell cortex in response to chemoattractant stimulation and localizes to the leading edge of migrating cells. Here, we examined localization of truncated RapGAP3 proteins and found that the I/LWEQ domain in the central region of RapGAP3 was sufficient for posterior localization in migrating cells, as opposed to leading-edge localization of full-length Rap-GAP3. All truncated proteins accumulated at the leading edge of migrating cells exhibited clear translocation to the cell cortex in response to stimulation, whereas proteins localized to the posterior in migrating cells displayed no translocation to the cortex. The I/LWEQ domain appears to passively accumulate at the posterior region in migrating cells due to exclusion from the extended front region in response to chemoattractant stimulation rather than actively being localized to the back of cells. Our results suggest that posterior localization of the I/LWEQ domain of RapGAP3 is likely related to F-actin, which has probably different properties compared to newly formed F-actin at the leading edge of migrating cells, at the lateral and posterior regions of the cell.

• 한국도로학회논문집
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• 제18권2호
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• pp.61-71
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• 2016

PURPOSES: The objective of this study was to determine the optimum ratio of mix design, for a reclaimed asphalt pavement (RAP) content of 100%, for spray injection application. METHODS: A literature review revealed that spray injection is an efficient and cost-effective application for fixing small defective regions of an asphalt pavement. Rapid-setting polymer-modified asphalt mixtures prepared from two types of rapid-setting polymer asphalt emulsion were subjected to Marshall stability and wet track abrasion tests, in order to identify the optimum mix designs. RESULTS and CONCLUSIONS : Different mix designs of type A and type B emulsions were prepared using RAP and virgin aggregates, in order to compare the performance and determine the optimum mix design. The performance of mixtures prepared with RAP was superior to that of mixtures containing virgin aggregates. Moreover, for optimum ratio of the design, the binder content prepared from RAP was set to 1~2% lower than that consisting of virgin aggregates. Compared to their Type A counterparts, type B mixtures consisting of a reactive emulsion performed better in the Marshall stability and wet track abrasion tests. The initial results confirmed the advantages associated with using RAP for spray injection applications. Further studies will be performed to verify the difference in the optimum mix design and performance obtained in the lab-scale test and tests conducted at the job site by using the spray injection machine.

• 한국엔터테인먼트산업학회논문지
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• 제15권4호
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• pp.101-111
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• 2021

본 논문은 2020년 한 해 동안 국내 주요 음원 사이트 중 하나인 멜론차트에 진입한 음악들 안에서 랩(Rap)의 활용과 기법을 분석한 연구이다. 대중들의 선호가 반영되어 차트에 진입한 곡들 중 힙합음악의 중요 요소인 랩 음악이 사용된 곡들의 트렌드를 분석하고 대표적인 아티스트, 혹은 자주 사용되는 리듬패턴 등 음악적 특징을 분석한다. 본 논문을 통해 요즘의 대중음악에서 대중들과 아티스트들이 선호하는 랩 음악의 음악적 특징을 정리하고 정형화했으며 이를 기반으로 기술 연마를 위한 에튀드 개발의 요소를 정리하였다. 이를 통해 오랜 시간 분석되고 체계화된 보컬과 악기 등의 연주기법들처럼, 다양한 스타일의 랩 음악 역시 이를 배우고 연습하고자 하는 학생들이 체계적이고 단계적으로 기술을 익혀나갈 수 있는 기법의 체계로 발전할 수 있기를 기대한다.

• Computers and Concrete
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• 제33권5호
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• pp.605-619
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• 2024

The increase of reclaimed asphalt pavement (RAP) content in recycled asphalt concrete (RAC) is accompanied by the degradation of low-temperature cracking resistance, which has become an obstacle to the development of RAC. This paper aims to reveal the meso-scale mechanisms of the low-temperature fracture behavior of RAC and provide a theoretical basis for the economical recycling of RAP. For this purpose, micromechanical heterogeneous peridynamic model of RAC was established and validated by comparing three-point bending (TPB) test results against corresponding numerical simulation results of RAC with 50% RAP content. Furthermore, the models with different aggregate shapes (i.e., average aggregates circularity (${\bar{C_r}}=1.00$, 0.75, and 0.50) and RAP content (i.e., 0%, 15%, 30%, 50%, 75%, and 100%) were constructed to investigate the effect of aggregate shape and RAP content on the low-temperature cracking resistance. The results show that peridynamic models can accurately simulate the low-temperature fracture behavior of RAC, with only 2.9% and 13.9% differences from the TPB test in flexural strength and failure strain, respectively. On the meso-scale, the damage in the RAC is mainly controlled by horizontal tensile stress and the stress concentration appears in the interface transition zone (ITZ). Aggregate shape has a significant effect on the low-temperature fracture resistance, i.e., higher aggregate circularity leads to better low-temperature performance. The large number of microcracks generated during the damage evolution process for the peridynamic model with circular aggregates contributes to slowing down the fracture, whereas the severe stress concentration at the corners leads to the fracture of the aggregates with low circularity under lower stress levels. The effect of RAP content below 30% or above 50% is not significant, but a substantial reduction (16.9% in flexural strength and 16.4% in failure strain) is observed between the RAP content of 30% and 50%. This reduction is mainly attributed to the fact that the damage in the ITZ region transfers significantly to the aggregates, especially the RAP aggregates, when the RAP content ranges from 30% to 50%.

• 인간행동과 음악연구
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• 제21권2호
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• pp.51-75
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• 2024

본 연구는 경도 지적장애 청소년의 담화기술 향상을 목표로 이야기 구성요소 기반의 치료적 랩 프로토콜을 구성하고, 해당 프로토콜의 실제적 적용 가능성을 탐색하고자 한 사례 연구이다. 본 연구에서는 이야기의 구성요소((배경서술, 개시사건, 내적반응, 시도 및 반응)와 랩의 구성요소(벌스, 훅, 추임새 등)를 매칭시켜, 참여자들이 자신의 경험을 연결된 담화 형태로 이야기하도록 유도하는 프로토콜을 구성하였다. 또한 구성된 프로토콜은 지적장애 청소년의 인지적, 언어적 발달 수준을 고려해 담화 구조의 경험 및 이해, 담화 구성요소의 적용을 통한 내용 구성, 담화 구조를 적용한 확장 형태의 이야기 시도의 단계로 점진적으로 난이도를 높여가며 진행되도록 하였다. 참여자들이 자신의 실제 경험을 표현한 이야기와 직접 구성한 랩의 내용을 분석한 결과, 중재 후 모든 대상자의 이야기와 랩의 구성 길이가 증가했으며, 랩에서 리듬적 특성을 포함하는 정도와 담화에서 이야기 구성요소를 포함하는 정도가 향상된 것으로 나타났다. 이러한 결과는 시도된 무작위 발화에 리듬을 붙여 랩을 구성하는 대신, 담화 구조를 반영한 구체적인 틀을 제공한 전략적 시도가 사건의 맥락과 논리적 연결성에 대한 참여자들의 이해를 증진시켰으며, 이 과정에서 랩의 다양한 요소와 리듬적 특성이 담화 시도의 동기 부여와 조직화를 강화할 수 있었음을 시사한다. 본 연구는 랩의 치료적 특성이 경도 지적장애 청소년의 고유한 언어 발달적 필요에 적용될 수 있음을 탐색함으로써, 해당 대상자를 위한 음악치료 중재 범위를 다양화하고 체계화했다는 점에서 의의가 있다.

• Industrial Engineering and Management Systems
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• 제4권1호
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• pp.94-101
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• 2005

This paper presents the first known application of a meta-heuristic algorithm, variable neighbourhood descent (VND), to the redundancy allocation problem (RAP). The RAP, a well-known NP-hard problem, has been the subject of much prior work, generally in a restricted form where each subsystem must consist of identical components. The newer meta-heuristic methods overcome this limitation and offer a practical way to solve large instances of the relaxed RAP where different components can be used in parallel. The variable neighbourhood descent method has not yet been used in reliability design, yet it is a method that fits perfectly in those combinatorial problems with potential neighbourhood structures, as in the case of the RAP. A variable neighbourhood descent algorithm for the RAP is developed and tested on a set of well-known benchmark problems from the literature. Results on 33 test problems ranging from less to severely constrained conditions show that the variable neighbourhood descent method provides comparable solution quality at a very moderate computational cost in comparison with the best-known heuristics. Results also indicate that the VND method performs with little variability over random number seeds.

• 한국안전학회지
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• 제33권6호
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• pp.128-135
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• 2018

Currently, the government selects products that are likely to cause harm to consumers as safety management targets and classifies them into three types: safety certification, safety confirmation, and supplier conformity verification. In addition, the government conducts safety surveys on products in circulation or accident products, and recalls products that are of great concern to consumer risks. In this paper, we have developed RAP (Risk Assessment method based on Probability), which is a probability based product risk assessment method, for the classification of safety management type of product and safety investigation, and have shown an application example. In this process, information is used for the CISS (Consumer Injury Surveillance System) of the Korean Consumer Agency. In addition, we apply the cluster analysis to classify the current supervised children products into three groups. Then, we confirm the effectiveness of RAP by comparing the result of RAP application, cluster analysis result and current safety management classification type. Also, we recognize the need to review the current safety management classification criteria for classifying products into three types.

• 디자인학연구
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• 제12권3호
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• pp.93-103
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• 1999

This study is investigated the formative characteristics of Rap Music and Hiphop fashion, and I try to comprehend about the fashion mind and fashion culture of teenager 1. Teenager's Hiphop Fashion is subcultures, the fashion culture of teenager reflects their unique identity. 2. The formative characters of Rap Music and Hiphop Fashion are the incompatibility ignored their body size and the popularity caused street fashion imitation, the unbalance ignored a principle of fashion design. 3. Hiphop Fashion is consist of jump-style jacket, hood -shirt, stripe T-shirt and drum pants, baggy pants, snowboard pants and so on. 4. The characters of Hiphop Fashion is the breaking of rule and the destruction. 5. They select something which they like, even though the price is high, so they is tendency to editing coordinate 6. Fashion business for teenager, it needs an ideal conversion not for 'company' but for 'individual' As this results, fashion culture of teenager came out to the surface of water, because of Hiphop Fashion.

• 한국인쇄학회:학술대회논문집
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• 한국인쇄학회 2007년도 추계 학술논문 발표회
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• pp.45-57
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• 2007

Properties of newly developed paper from Red Algae Pulp (RAP) were examined. The paper samples were prepared according tomixing RAP fiber with wood fibers, HwBKP and SwBKP, to form a paper with 60 g/$m^{2}$ in weight. It was prepared in three to four different levels of refining degree and pressure so that it can reveal different bulk level in order to clearly compare the opacity at equivalent bulk for each furnish compositions. printability of RAP fiber revealed superior effect on print through repression and initial ink absorption. Those properties are expected to improve further if printability improvement effect due to smoothness improvement is added.