• The Journal of the Korea Contents Association
• /
• v.14 no.11
• /
• pp.611-619
• /
• 2014

The purpose of this study was to examine the technique of modal changes and its performance effect in Manjeong Kim, So-hui's pansori "Chunghyangga" at the portion of jungmori. It is because Manjeong-style "Chunghyangga" effectively presents dramatic scenes, role changes and emotional variations through modal changes of pansori. In this study, such two songs as and in jungmori were examined and study findings are as follows: Modal changes always reflected dramatic scenes, role changes, situational alterations and emotional variations. In addition, all the transpositions of the two songs were related to geunchin-jo and euddeumeum-jo. In , the technique of modal changes was intensively used in the latter half of the song, whereas in , it was used from the middle portion of the song. All of these uses of modal changes resulted in an excellent performance effect, which was musically expressed in order to discriminate it from the portion of role changes or explanations.

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.7 no.1
• /
• pp.69-75
• /
• 2012

The study was conducted to determine the effects of adding pig blood as an admixture to both mortar and concrete. The mortar tests included the determination of its unit weight, flow and its compressive strength. Moreover, the concrete test includes the determination of air content, slump, bleeding, setting time compressive strength and freeze-thaw resistance of the material. As the test result, the utilization of pig blood, as an additive to both mortar and concrete mixtures causes air entrainment. The mortar flow increased and both the unit weight and the compressive strength of mortar decreased. As the blood replacement rate increases, the air content decreases over time, the setting and amount of bleeding showed a tendency to decline and reduced compressive strength, and the freeze-thaw resistance of the concrete increased.

• Proceedings of the Korea Concrete Institute Conference
• /
• 1990.10a
• /
• pp.135-140
• /
• 1990

일반적으로 플라이애쉬는 콘크리트의 여러 가지 물성을 크게 개선시키는 것으로 알려져 있으나, 플라이애쉬 자체의 함유 성분에 따라서는 이러한 개선 효과가 감소하는 경우도 있다. 본 연구에서는, 플라이애쉬에 함유된 미연탄소가 공기연행 콘크리트의 물성에 미치는 영향을 규명하고, 품질관리면에서 사용상의 주의점을 지적한다.

• The Journal of the Convergence on Culture Technology
• /
• v.4 no.2
• /
• pp.123-130
• /
• 2018

Storytelling is a compound of two words, 'story' and 'telling'. While the static aspect of 'story' has been emphasized, the dynamic and specific aspect of telling has been ignored. So, in the argument of 'storytelling', it is necessary to break from talking about 'story' and discuss the matter in terms of 'telling' and 'interaction'. In order to accept this need, the term 'Traditional Storytelling' is coined to engage 'oral-storytelling situation' more actively. When 'storytelling' is expressed by a storyteller, it can be referred to 'traditional storytelling', called 'oral performance'. In fact, the storytelling, which has a long history, originated from oral storytelling such as 'oral narration'. It is natural that our current storytelling isn't the same storytelling of an oral period, but the traditional storytelling casts a few crucial viewpoints to us these days when 'telling' has a significant meaning. In the first place, it is 'reflexivity' that we should note in the form of traditional 'storytelling'. It is a kind of self-reference which means reflecting and looking back at oneself in the form of narration. Through this reflexivity, the storytelling is affected by the site of telling and an aspect of one-off thing very frequently. Another point we need to note is a frame. Through this frame, the traditional storytelling come to hold time and space of narration.

• Journal of Korean Society of Steel Construction
• /
• v.29 no.6
• /
• pp.467-477
• /
• 2017

The live load effect of KL-510 of the current Korean bridge design code is examined by comparing with that of the multiple trucks of which the weights are statistically estimated from measured traffic data as well as with those of the related live load models. The truck weight data measured on the expressway before and after overweight enforcement are used to obtain the truck weights following the same procedures in deciding the live load model of the design codes and the results are compared with the load effect of KL-510. KL-510 yields a very uniform loading effect compared with the multiple truck effects when the weights are estimated from the data which contains some of the heavy trucks over the operational weight limit. KL-510 yields consistent results with the live load of AASHTO LRFD and shows less variation than the past load model DB-24 over the span lengths considered in this study. As a result of this research, the actual truck combinations equivalent to the notional KL-510 load model are constructed and it can be applied to the evaluation of the existing bridge and the calibration of the load factor of the permit vehicle.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2022.05a
• /
• pp.262-262
• /
• 2022

토석류는 산지 사면에서 발생하여 지형변화에 큰 영향을 미치는 대표적인 자연재해 중 하나로 국내에서 발생하는 토석류는 홍수, 태풍 등 타 재해에 비하여 상대적으로 매우 짧은 시간에 발생하며, 사후대응이 어려우므로 사전대비가 필수적이다. 토석류로 인한 피해를 효과적으로 대비하기 위해서는 국내의 지질, 지형 그리고 강우에 따라 발생하는 토석류에 대한 보다 체계적인 정밀현장조사를 통한 자료 구축과 이를 분석한 토석류의 발생원인, 이동경로와 침식 및 퇴적에 관한 연구가 필요하다. 최근의 토석류 연구에서는 침식-퇴적 및 연행작용에 의한 효과를 반영한 수치모의 연구들이 있으나, 모형의 검증을 위한 침식-퇴적 거동에 대한 자료는 현재까지 매우 부족한 실정이다. 토석류 발생에 따른 침식-퇴적 거동특성은 그 자체로도 공학적으로 중요한 요소이며, 수치해석 모의에 필요한 매개변수 추정에도 필요한 항목이다. 토석류 모의의 검증자료로 활용될 수 있는 토석류에 대한 실험적 연구는 토석류의 확산 형태 및 확산 길이에 대한 내용이 대부분으로 흐름수로에서의 침식 및 퇴적에 대한 연구는 찾아보기 어려운 상태이다. 본 연구에서는 토석류 발생에 따른 흐름부에서의 침식 및 퇴적에 대한 거동 특성을 분석하기 위하여 함수비, 흐름수로 경사, 상부 붕괴토조의 토사깊이, 흐름수로 침식가능 깊이 등 다양한 조건으로 실내모형실험을 수행하였다. 상부 토조의 토사 함수비가 30~80% 실험에서는 퇴적 현상이 탁월하였고, 100% 이상인 실험에서는 침식 현상이 확연하게 나타나 토사의 함수비가 높아지면 집중호우 등 선행강우로 인한 산지 지역에서 발생되는 토석류 현상과 유사하고, 함수비가 낮으면 토석류(Debris flow)가 아닌 입상유동(Granular flow)으로 보는 것이 적절한 것으로 판단된다. 상부 토조의 함수비를 100% 이상으로 변화하여 침식이 발생한 실험에서 상부 토조의 액화 된 토사는 빠른 속도로 흐름이 진행되면서 함수비와 붕괴 체적이 증가할수록 흐름수로 상류부에 침식이 크게 나타나고, 상류부의 토사를 중류부를 거쳐 하류부까지 연행(Entrainment)하는 것으로 판단된다.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.13 no.4
• /
• pp.77-86
• /
• 1993

Recently it is reported in many countries that highway bridges are seriously damaged due to increasing volume of overloaded heavy vehicles. The safety of bridges are highly related to the design load level and the characteristics of extreme load effect induced by traffic loads during its lifetime. The maximum structural load effect during lifetime may be produced by simultaneous loading of trucks with moderate weights on a bridge rather than by single loading of extremely heavy trucks. In this study, a simulation technique to estimate extreme load effect due to traffic loadings has been developed, in which important characteristics of traffic loadings, such as heavy vehicle proportion, traffic mode, vehicle weights, headway distribution. daily traffic volume, etc., should be properly considered. In addition. sensitivity analysis on those factors have been performed.

• Journal of the Korea Concrete Institute
• /
• v.17 no.5 s.89
• /
• pp.695-702
• /
• 2005

It is known that latex-modified concretes were increased their durability and permeability by added latex. The purpose of this study was to analysis the air void systems in latex-modified concretes using a reasonable and objective image analysis method with main experimental variables such as water-cement ratios, latex contents(0%, 15%) and cement types(ordinary portland cement, high-early strength cement and very-early strength cement). The results are analyzed spacing factor, air volume after hardened, air distribution and structure. Also, air void systems and permeability of latex-modified concretes were compared with correlation. The results are as follows; The same w/c ratio LMC showed better air entraining effect than OPC with AE water reducer. The VES-LMC showed that the number of entrained air below $100{\mu}m$ increased more than four times. In the HES-LMC, micro entraining air having range from 50 to $500{\mu}m$ increased above 7 times without antifoamer. Though spacing factor was measured low, latex-modified concretes were showed that permeability was good. It is considered that air void system does not have an effect on the property of latex-modified concretes but latex film is more influenced in the their durability.

• International Journal of Highway Engineering
• /
• v.7 no.1 s.23
• /
• pp.73-82
• /
• 2005

Linear traverse method and point count method described at ASTM have been widely used to estimate the air void system in hardened concrete. These methods, however, are rarely used at present, because they require many efforts and time consuming works. Also these results depend on each person's decision, and are not repeatable. Thus, new image analysis method using microscope and computer processes has been approached for analyzing air void system in hardened concrete. The purpose of this study was to analysis the air void systems in latex-modified concretes using a reasonable and objective image analysis method with main experimental variables such as cement types(ordinary portland cement, rapid setting cement) and latex contents(0%,15%). In the results of this study, the use of polymer latex showed that it could be attributed to its air void systems, due to the fact that the latex emulsion acts as an air-entraining agent, which thus generally guarantees an adequate air-void system.

• Journal of the Korea Concrete Institute
• /
• v.26 no.5
• /
• pp.607-614
• /
• 2014

The purpose of this dissertation was to investigate the effect of mineral admixtures, such as fly ash, blast furnace slag powder, meta kaolin and silica fume, on the basic properties and durability of crushed sand shotcrete, selecting a series of shotcrete mixtures with a variable admixture. Compressive strength increased as the content of mineral admixtures increased, specially it was the most effective when using meta kaolin both at sample specimen and core after shotcreting. Rapid chloride ion permeability test and sulfuric acid resistance test showed that both durability increased as the substitute rate of mineral admixture increased. In air void analysis with image analysis, the targeted the spacing factor and specific surface were not satisfied because air-entrained agent was not used.