제주도 현무암 골재를 활용한 중온 아스팔트 포장 적용에 관한 연구

안덕순,백철민 한국도로학회 2021 한국도로학회논문집 Vol.23 No.6

PURPOSES : The purpose of this study is to evaluate an asphalt mixture via field application to utilize basalt aggregates produced on Jeju Island for a warm mix asphalt (WMA). METHODS : Using commercially available WMA additives, an indoor experiment is conducted on low- and high-void aggregates among basalt aggregates on Jeju Island. The physical properties of the WMA mixture are evaluated using one solid type and two liquid types of WMA additive. To evaluate the applicability of the WMA additives, air void, saturation, aggregate void, Marshall stability, flow number, indirect tensile strength, and toughness tests are performed. For the field application of WMA using basalt aggregates, three types of pavements (HMA, WMA-Solid, and WMA-liquid) are constructed. When applying the pavements in the field, an anti-stripping agent is incorporated to improve the water resistance while considering the characteristics of the basalt aggregate. Samples are acquired via plant and field coring to evaluate the properties of the materials applied in the field. RESULTS : In the indoor test for analyzing the applicability of the commercialized WMA additives to basalt aggregates, all tests except the indirect tensile strength test show results that satisfy the standards. All test results, including that from the indirect tensile strength test, satisfy the standard values in the test that uses the sample material obtained from the plant. Similarly, in the test with field cores, all test results satisfy the standard values. Therefore, the experimental value in the field application is generally higher than the test value in the indoor experiment. It is inferred that this is due to the difference between the basalt aggregates used in the indoor and field experiments, as well as the addition of the anti-stripping agent. CONCLUSIONS : Basalt aggregates produced on Jeju Island can be used for WMA pavements, as demonstrated via indoor experiments and field applications. However, owing to the characteristics of basalt aggregates, a method for improving water resistance should be considered, and tests to determine the indirect tensile strength should be performed using various basalt aggregates. In addition, because various basalt aggregates exist owing to the diverse geology characteristics of Jeju Island, they should be evaluated via more experiments and field applications.

민요를 보는 시각과 쟁점

김혜정 한국민요학회 2014 한국민요학 Vol.42 No.-

Folksong theory can be discussed at different levels. Fundamentally, the perspective and attitude of researchers to approach folksongs are based on certain theory. This paper organized and reflectively examined folksong theories that have been the foundation of folksong research. Perspectives on folksongs are field theory, structuralism, transmissionism, and application theory, with inter-disciplinary research as another main research perspective. The following are the results. Firstly, field theory focuses on the transmission field and performance field itself while structuralism thoroughly studies the object and reveal the structure. Structuralism recognizes folksongs as a fixed entity and approaches it, driving a contrast with the field theory. However, when field theory perspective is connected with structuralism and used to study various aspects of folksongs, it will help reveal the universal structure of folksongs, which are very flexibile. That is why structuralism is complementary to field theory. Secondly, in terms of transmissionism, there have been two competing arguments, namely, the archetype and constructivism. The archetype contends that there is the object of tradition and legitimacy, and one must strive to protect and transmit it while constructivism argues that culture is undergoes changes constantly and can be changed. However, there are armchair arguments. Any researcher who has been on the field will understand the pros and cons of the both positions. Folksongs are understood as a living culture and they do not possess a fixed archetype and they are formed with grammar which contain the national identity. It's because that's the virtue that can obtained on the field. Thirdly, application theory is discussed in three parts:educational application, industrial application, and national movement application. Under today's circumstances, researchers are rarely allowed to focus only on folksongs. There must be a debate on what to transmit and what to preserve. There is a need for transmissionism and application theory that fit today's reality. Fourthly, inter-disciplinary research is the revelation of will to look at comprehensive and various aspects of folksongs. Theory is theory. Theory can operate positively and negatively depending on how it is used and applied. Therefore, it is first to understand the existence and identity of folksongs. Then, we can think about how folksongs can survive under the current circumstances and cultural flow. Lastly, these positions should be examined against the existing theories to help establish new theories. 민요 이론이란 다양한 층위에서 논의 가능하지만 근본적으로는 민요를 어떻게 바라보고 접근하며, 연구하는 지의 시각과 자세도 일정한 이론에 바탕을 두고 있다고 할 수 있다. 이 글에서는 민요연구의 바탕으로 작용되어 왔던 민요 이론들에 어떤 것들이 있는지 정리해 보고 반성적으로 검토해 보았다. 민요를 보는 시각으로 현장론과 구조주의, 전승론과 활용론을 들 수 있고, 이외에 주요한 연구 관점으로 간학문적(間學問的) 연구를 살펴볼 수 있다. 연구 결과를 정리하면 다음과 같다. 첫째, 현장론은 전승 현장과 연행 현장 자체를 주목하는 것이며, 구조주의는 대상을 면밀하게 분석하여 그 구조를 드러내는 작업을 말한다. 구조주의는 민요를 고정된 대상으로 인식하고 접근한다는 점에서 현장론과 상반되는 측면이 있다고 볼 수 있다. 그러나 현장론적 시각을 구조주의에 접목하여 민요의 다양한 각편을 대상으로 연구하면 유동성이 강한 민요의 보편적 구조를 드러낼 수 있다는 점에서 현장론과 상보적인 방법론이라 할 수 있다. 둘째, 전승론에 있어서는 원형주의와 구성주의라는 두 가지 상반된 입장에 대한 논쟁이 있어 왔다. 원형주의는 전통성과 정통성이 있는, ‘원형’이라고 부를 만한 대상이 있다고 상정하고 이를 지켜서 전승해야 한다고 보는 입장이며, 구성주의는 문화란 그때그때 구성되는 것이므로, 항상 변화되고 있고, 변화될 수 있다고 보는 입장이다. 그러나 이는 책상 위의 토론일 뿐이다. 실제로 민요의 현장을 돌아다니면서 민요를 연구해온 학자들이라면 이 두 가지의 장점과 단점, 또는 적용 가능치를 알고 있을 것이다. 민요는 살아있는 문화이므로 하나의 원형만을 갖고 있지 않다는 점도 알고 있을 것이며, 민족적 정체성을 담은 어법으로 구성되는 대상이라는 점도 파악되어 있을 것이다. 그것이 현장에서 얻을 수 있는 미덕이기 때문이다. 셋째, 활용론은 크게 세 가지 정도의 논의가 있어 왔다. 교육적 활용, 산업적 활용, 민요운동론적 활용이 그것이다. 연구자가 민요 자체만 연구할 수 없는 것이 작금의 현실이다. 무엇을 전승하고 살려 나가야 할 것인지에 대한 논쟁이 필요하다. 그래서 보다 시대성에 맞는 전승론과 활용론을 세워 나가야 할 것이다. 넷째, 간학문적 접근의 연구는 민요의 종합적이고 다양한 측면을 살펴보고자 하는 의지의 발현이다. 자신이 속한 학문을 제대로 해내는 것도 중요하지만, 민요라는 대상을 있는 그대로 이해하기 위해서 다른 접근 방식과 새로운 시각을 접목해 보는 시도도 많아져야 한다고 본다. 이론은 이론일 뿐이다. 이론은 어떻게 적용되고 활용되는지에 따라 긍정적으로, 또는 부정적으로 작용할 수 있다. 따라서 민요의 실체와 존재 특성을 제대로 이해하는 것이 먼저이고, 시대적 상황과 문화적 큰 흐름에서 민요가 어떻게 살아남아야 할 것인가에 대한 고민들을 하는 것이 다음이며, 이러한 입장들이 기존의 이론과 어떻게 일치하고 위배되는지를 따져 새로운 이론을 세워 나가야 하는 것이 종국에 우리가 해야 할 일이다.

남부 중간지 자운영재배답에서 벼재배시 논 유형에 따른 질소시비량 구명

윤봉기,김병호,김희권,이인,최형국,박인진 한국국제농업개발학회 2003 韓國國際農業開發學會誌 Vol.15 No.1

중간지의 보통답과 사질답에서 녹비작물인 자운영을 재배한 논에 벼를 재배할 때 답 유형에 따른 질소비료 시용량을 구명하고자 전남 구례의 보통답과 사질답에서 관행, 자운영+질소 70%, 자운영+질소 50%, 자운영+질소 30%, 자운영+무질소의 5처리로 2000년부터 2년동안 시험한 결과는 다음과 같다. 1. 자운영의 개화성기 생육은 초장 44.1∼44.2㎝, 생초중 20.1∼22.5Mg ㏊^-1이였으며 무기성분 함량은 T-N 2.46∼2.68%, P_2O_5 0.56∼0.60%, K_2O 2.05∼2.18%였다. 사질답에 비하여 보통답에서 자운영의 생초중이 많았다. 2. 토양중 NH_4-N함량의 경시적 변화는 이앙 후 7일에 21.5∼48.3㎎ ㎏^-1으로 가장 높았으며 이앙후 70일에 7.0∼9.7㎎ ㎏^-1으로 점차 감소하였는데 처리에 따라서는 자운영+질소 70%, 자운영+질소 50%시용구에서 높았다. 3. 벼 수확기의 간장 76∼85㎝, 수장 17.9∼19.2㎝로 사질답이 보통답에 비하여 간장, 수장이 컸다. 4. 시험후 토양의 화학성은 pH 5.4∼5.8, OM 21.5∼24.4g ㎏^-1, CEC 9.2∼10.9cmol ㎏^-1, Ava. P_2O_5 141∼360㎎ ㎏^-1으로 자운영처리구에서 OM, CEC함량이 증가하였다. 5. 벼의 수량은 관행(보통답 5.03Mg ㏊^-1, 사질답 5.18Mg ㏊^-1)에 비하여 보통답의 자운영+질소 70%, 50%시용구에서 각각 5, 4%증수되었고, 사질답에서는 자운영+질소 70%, 50%시용구에서 각각 7, 4%증수되었다. 6. 남부 중간지에서 자운영을 재배하여 생초 20Mg ㏊^-1를 녹비로 투입하면 벼를 재배시 질소 시용 적정량은 보통답, 사질답 모두 관행 시비량의 50%이였다. This study was conducted to find out fertilizer recommendation rates for rice at a normal and sandy paddy field after planting milk vetch(MV) in Guryae which lies to southern medium altitude region from 100m to 250m above sea level from 2000 to 2001. The amount of N fertilizer were 110(normal paddy) and 130(sandy paddy) ㎏ ㏊^-1 at control and 0, 30, 50, 70% of the control. At flowering stage of milk vetch, the content of T-N, P_2O_5, K_2O in plant were 2.46∼2.68%, 0.56∼0.60%, 2.05∼2.18%, respectively. Plant height were 44.1∼44.2㎝. Fresh weight were 20.1∼22.5Mg ㏊^-1. Fresh weight of milk vetch cultivated in normal paddy field was more than that in sandy paddy field. The content of NH_4-N in soil was 21.5∼48.3㎎ ㎏^-1 at 7 days after planting and 7.0∼9.7㎎ ㎏^-1 at 70 days after planting. Content of NH_4-N in soil was increased at the treatments of milk vetch + N 70, 50% of control. Culm length was 76∼85㎝, panicle length was 17.9∼19.1㎝ at harvesting stage. Culm length and panicle length at sandy paddy field were longer than those of normal paddy field. Chemical properties of soil after experiment were pH 5.4∼5.8, OM 15.6∼21.5g ㎏^-1, CEC 9.2∼10.9cmol ㎏^-1, Ava. P_2O_5 141∼360㎎㎏^-1, respectively. The content of OM, CEC in soil applied milk vetch at normal paddy field was higher than those of the control, and the content of CEC in soil applied milk vetch at sandy paddy field was higher than that of the control. When milk vetch was cut at flowing stage, rice yield of milk vetch + N 70, 50% of control plot were increased 5, 4% more than that of control(5.03Mg ㏊^-1) at normal paddy field. Rice yield vetch+N 70, 50 of control were increased 7, 4% more than that of control(5.18Mg ㏊^-1) at sandy paddy field. Nitrogen application rate of normal and sandy paddy field was 50% of conventional fertilization rate when 20Mg ㏊^-1 milk vetch cultivated paddy field was inputed for rice culture in the southern medium altitude.

제주도 현무암 골재를 활용한 중온 아스팔트 포장 적용에 관한 연구

안덕순,백철민 한국도로학회 2021 한국도로학회지 Vol.23 No.3

PURPOSES : The purpose of this study is to evaluate an asphalt mixture via field application to utilize basalt aggregates produced on Jeju Island for a warm mix asphalt (WMA). METHODS : Using commercially available WMA additives, an indoor experiment is conducted on low- and high-void aggregates among basalt aggregates on Jeju Island. The physical properties of the WMA mixture are evaluated using one solid type and two liquid types of WMA additive. To evaluate the applicability of the WMA additives, air void, saturation, aggregate void, Marshall stability, flow number, indirect tensile strength, and toughness tests are performed. For the field application of WMA using basalt aggregates, three types of pavements (HMA, WMA-Solid, and WMA-liquid) are constructed. When applying the pavements in the field, an anti-stripping agent is incorporated to improve the water resistance while considering the characteristics of the basalt aggregate. Samples are acquired via plant and field coring to evaluate the properties of the materials applied in the field. RESULTS : In the indoor test for analyzing the applicability of the commercialized WMA additives to basalt aggregates, all tests except the indirect tensile strength test show results that satisfy the standards. All test results, including that from the indirect tensile strength test, satisfy the standard values in the test that uses the sample material obtained from the plant. Similarly, in the test with field cores, all test results satisfy the standard values. Therefore, the experimental value in the field application is generally higher than the test value in the indoor experiment. It is inferred that this is due to the difference between the basalt aggregates used in the indoor and field experiments, as well as the addition of the anti-stripping agent. CONCLUSIONS : Basalt aggregates produced on Jeju Island can be used for WMA pavements, as demonstrated via indoor experiments and field applications. However, owing to the characteristics of basalt aggregates, a method for improving water resistance should be considered, and tests to determine the indirect tensile strength should be performed using various basalt aggregates. In addition, because various basalt aggregates exist owing to the diverse geology characteristics of Jeju Island, they should be evaluated via more experiments and field applications.

현장적용 유아과학교육 수업이 예비유아교사의 과학 내용교수지식(PCK) 향상에 미치는 영향

김래은,안영혜 국제차세대융합기술학회 2023 차세대융합기술학회논문지 Vol.7 No.3

본 논문은 현장적용 유아 과학교육 수업이 예비 유아 교사의 과학 PCK에 미치는 영향을 알아봄으로써 현장적용 유아과학교육 수업의 교육적 효과를 살펴보고자 하였다. 이를 위해 충북의 U, D대학 유아교육과에 재학 중인 예비유아교사 51명을 연구대상으로 삼았고, 실험집단(25명)에게는 현장적용 유아과학교육 수업을 실시하였고, 비교집단(26명)에게는 유아과학교육 모의 수업을 실시하였다. 사전·사후검사로 김현정(1992)의 ‘유아교사의 과학 교과교육학 지식’ 검사 도구를 사용하였고, 두 집단 간의 사전점수의 차이는 독립표본 t-검증, 사후점수의 차이는 공분산분석(ANCOVA)을 실시하였다. 연구결과, 첫째, 현장적용 유아과학교육 수업을 적용한 집단이 유아과학교육 모의 수업을 적용한 집단보다 과학 PCK 전체 점수가 유의한 차이로 더 높게 나타났다. 둘째, 현장적용 유아과학 교육 수업을 적용한 집단이 유아과학교육 모의 수업을 적용한 집단보다 과학 PCK 하위영역인 교육과정 지식, 학 습자 지식, 교수-학습방법 지식, 교과내용지식, 교사 전문성 지식의 모든 점수가 유의한 차이로 더 높게 나타났다. 이러한 결과는 현장적용 유아과학교육 수업을 적용한 예비유아교사의 과학 PCK 향상에 긍정적인 효과가 있으며 현장 적용 수업이 예비유아교사의 유아과학 교수방법으로 효과적인 방법임을 시사한다. 또한, 본 연구가 현장 연 계 기반 수업 운영 사례를 제시하였다는 점에서 교육적 의의가 있으며 이러한 수업 운영의 활성화를 기대한다. The purpose of this study was to examine the educational effects of the early childhood science education lessons through field application by figuring out the influence of the early childhood science education lessons through field application on PCK(Pedagogical Content Knowledge) of pre-service early childhood teachers. To this end, targeting 51 pre-service early childhood teachers who are attending the Department of Early Childhood Education at U and D Universities in Chungbuk, the early childhood science education lessons were carried out the field application class in the experimental group(25 students) and the simulated class in the comparative group(26 students). The pre·post tests were used a test tool for ‘Early childhood teachers’ pedagogical content knowledge of science teaching’ by Kim Hyeon-jeong(1992). A difference between pre·post scores in two groups was statistically processed by executing independent sample t-test and ANCOVA. As a result of the research, first, the field application lesson was indicated to have a positive impact on enhancing PCK of pre-service early childhood teachers more than the simulated class. Second, the field application lesson appeared to have a positive influence on curriculum knowledge, learners’ knowledge, teaching-learning method knowledge, SMK(Subject Matter Knowledge), teachers’ professionalism knowledge, which are sub-spheres in pre-service early childhood teachers’ PCK. These results mean that there is a positive effect on the improvement of science content teaching knowledge (PCK) of pre-service early childhood teachers who applied field-applied early childhood science education classes. Therefore, it suggests that field application class is an effective method for teaching early childhood science for pre-service early childhood teacher.In addition, this study has educational significance in that it presented an example of class operation based on field connection, and it is expected that such class operation will be revitalized.s

특허정보를 이용한 블록체인 기술의 활용분야 동향 분석

박찬정,박기문 한국차세대컴퓨팅학회 2018 한국차세대컴퓨팅학회 논문지 Vol.14 No.2

Block chain is a technology that ensures the contract without trusted third party of the middle. It is mainly used for authentication of cryptocurrency transactions such as Bitcoin and Etherium. The block chain technology is widely used not only in the field of cryptocurrency but also in the fields of public record/security, industry and fintech/payments. In order to understand various application fields of block chain technology, patent data of related technology field was analyzed. Patent data provides various technical information. Therefore, technology can be easily grasped and promising technology fields can be found. In this paper, we analyze patent trends on the application field of block chain technology. In the last five years, we searched patents of Korea, US, Japan, Europe and China. As a result, we extracted 778 valid patents. As a result of analysis, China had the most patent applications. Block chain technology has been used in financial/asset transactions, cryptocurrency, e-commerce/ marketing, device/energy management, program/digital contents, logistics/product/production management, and public agency/enterprise management. In particular, this paper shows that block chain technology is utilized in institutions such as hospitals and schools, and block chain technology is widely used in energy, transportation, logistics and product management. 블록체인은 중간의 제3자 없이 신뢰할 수 있는 계약을 보장해 주는 기술로서, 비트코인 및 이더리움과 같은 암호화폐 거래인증에 주로 사용되고 있다. 블록체인 기술은 암호화폐 분야뿐만 아니라 공공·보안, 산업 및 거래·결제 분야등에 다양하게 활용되고 있다. 블록체인 기술의 다양한 활용분야를 알아보기 위하여 관련 기술 분야의 특허정보를분석하였다. 특허정보는 다양한 기술정보를 제공하고 있으므로, 해당 기술의 동향을 쉽게 파악할 수 있으며, 향후유망 기술 및 사업 분야를 발굴할 수 있다. 이에 본 논문에서는 블록체인 활용분야 기술의 주요 국가의 특허출원 동향, 블록체인 활용분야 기술별 출원 현황 및 국가 별 주요 출원인 현황을 알아보고자 한다. 이를 위하여 최근 5년내에 출원된 한국, 미국, 일본, 유럽 및 중국의 특허를 검색하였고, 총 778건의 유효특허를 추출하였다. 분석결과, 중국이 가장 많은 특허출원을 하고 있었다. 블록체인 기술은 금융/자산거래, 암호화폐, 전자상거래/마케팅, 디바이스/에너지관리, 프로그램/디지털콘텐츠, 물류/상품/생산관리, 공공기관/기업관리 등에 활용되었다. 특히 본 논문을통해 병원 및 학교와 같은 기관에서도 블록체인 기술이 활용되어 있으며, 에너지, 이동수단, 물류 및 제품관리 등에도 블록체인 기술이 다양하게 활용되고 있음을 알 수 있었다.

교육현장적용을 중심으로 한 에듀테인먼트 분야의 국내 연구동향 분석: 2000년부터 2014년까지

이현아 ( Hyun Ah Lee ),김영환 ( Young Hwan Kim ) 부산대학교 과학교육연구소 2015 교사교육연구 Vol.54 No.1

본 연구의 목적은 에듀테인먼트 분야의 국내 연구동향을 알아보는 것으로, 이를 위해 2000년부터 2014년까지의 15년간의 에듀테인먼트 분야의 국내 학위논문과 학술지 논문 109개를 선정하여 발행연도, 구현유형, 연구대상(학습자, 콘텐츠), 연구방법, 교육효과에 대해 분석하였다. 빈도분석과 교차분석을 통한 결과는 다음과 같다. 첫째, 에듀테인먼트 연구의 구현유형은 웹, 컴퓨터, CD타이틀에서 애니메이션, 체험활동, 모바일 중심으로 변화하였다. 둘째, 에듀테인먼트 연구의 학습자 동향은 학위논문에서는 유아.아동과 초등학생의 비율이 높았고 학술지 논문에서는 전체 연령을 대상으로 하는 연구가 많았다. 그리고 에듀테인먼트 연구의 콘텐츠 분석에서는 학위논문은 영어, 콘텐츠 전반, 국어의 순서로 비율이 높았고 학술지 논문에서는 콘텐츠 전반, 영어의 순서로 비율이 높았다. 셋째, 에듀테인먼트 연구의 연구방법과 학습자 간, 연구방법과 콘텐츠 간의 교차분석 결과에서 모두 통계적으로 유의미한 상관관계를 나타내었다. 넷째, 에듀테인먼트 연구에서 가장 비중 있게 다루어진 교육효과는 학습에 대한 관심.참여와 학업점수 향상이었다. 다섯째, 에듀테인먼트의 연구방법과 교육효과 간의 분석에서는 문헌고찰과 설문.면담으로 연구를 수행한 경우에는 학습에 대한 관심.참여를, 현장에 에듀테인먼트를 투입하여 측정.평가한 연구는 학업점수의 향상을 더욱 비중 있게 다룬 것으로 나타났다. 본 연구의 결과에 터한 제언들은 다음과 같았다. 첫째, 에듀테인먼트의 개념을 명확히 규명하고 이를 안전하게 교육현장에서 활용할 수 있는 후속연구들이 절실히 요청된다. 둘째, 온라인 활동과 오프라인 활동이 스마트기반이나 모바일 기반으로 연계되는 블렌디드형 에듀테인먼트와 창의적 체험활동 등과 연계된 교육현장 연계 강화형 에듀테인먼트 등에 대한 연구들이 요청된다. 셋째, 에듀테인먼트에 대한 교육현장의 인식과 태도, 요구 조사 등과 같은 연구들과 에듀테인먼트의 장단점과 스마트 시대의 부작용들을 극복할 수 있는 교육 커뮤니티 등에 대한 이해와 연구들이 나와야 할 때이다. The purpose of this study was to investigate the current status and educational effects of the application of edutainment through analyzing recent researches. This study analyzed 109 theses and articles according to publication year, learners and contents, and accounted for recent research trends using a frequency analysis. Additionally, this study investigated the current status and educational effects of the application of edutainment using a crossover analysis. The results from this study are as follows. First, the edutainment application types changed from web-based, computer and CD models to activity-based animation for mobile devices. Second, the theses focused on children and elementary students learning English, focusing on the whole learner and on general content. Third, the correlation results between edutainment and learner and edutainment and contents were statistically meaningful as were the results of crossover analysis. Fourth, the educational effects from edutainment were concentrated in increasing attention and participation to learning for both learners and content application. Fifth, in relation to the application edutainment and its educational effects, researches and focused surveys have increased its interesting in learners’ attention and participation to learning, while researches of filed application have mainly studied the increasing scores for academic achievement. Suggestions for future studies based on the results of this study are follows. First, future studies should clearly define and expand the application of the edutainment concept to include to all educational fields. Second, future studies should investigate the design and application of the various types of edutainment such as blending smart devices with field activity, and the edutainment with formal curriculum (ex. creative field activity) and local community. Third, future studies should measure perceptions and attitudes towards field-applied edutainment. These researches will play a role for coping with negative results from universally using smart devices and frequently applying edutainment in the near future.

소수성 특성을 이용한 저점도 AP 표면처리재의 현장 적용성 연구

최준성 한국도로학회 2014 한국도로학회논문집 Vol.16 No.1

PURPOSES : Surface treatment material for pavement preventive maintenance should be inspected field applicability. This study(Part Ⅱ) aimed to checkup coating characteristics and performance analysis using lab and field tests. The hydrophobic - low viscosity filling material for pavement preventive maintenance is presented in Part Ⅰ, which is a series of companion study. METHODS: Relative comparison between general asphalt mixtures and surface treatment asphalt mixtures are analyzed and measured for the field application such as indirect tensile strength ratio(TSR), abrasion resistance, crack propagation resistance, temperature resistance, coating thickness, permeability resistance and skid resistance in terms of british pendulum number(BPN). RESULTS: It is found that TSR, crack propagation resistance and permeability resistance is increased as against uncoated asphalt specimen. Abrasion resistance and temperature resistance is secured from the initial coating thickness point of view, which is about 0.2~0.3mm. Skid resistance on the surface treatment pavement is satisfied with the BPN criteria of national highway because of exposed aggregate and crack sill induced pavement deterioration and damage cracks. CONCLUSIONS : The hydrophobic - low viscosity surface treatment material for pavement preventive maintenance is validated on field applicability evaluation based on quantitative analysis of coating thickness and performance analysis using lab and field tests.

현장체험학습을 위한 유적지 답사 어플리케이션 개발

김정이 한국지식정보기술학회 2013 한국지식정보기술학회 논문지 Vol.8 No.5

The increase of smartphones has not only been changing our lives more convenient but is also gradually reaching out into the teaching method. Students are now able to change their class from the indoor-learning style to the field-experience-learning one using smart phones. In this study, we have implemented a smart phone application that supports field trips for history curriculum. This application is designed to attract voluntary participation from students. A teacher can configure missions that are related to the target objective or spot. The missions will be delivered only to those who have reached the determined spot, for the teacher also can track down the students’ location. Moreover, each mission is in various forms such as a photograph shooting or a group-mission about historical district, as well as regular assignment.

현장 냄새의 5가지 특성 모니터링이 가능한 모바일 냄새 앱 구성 요소 개발

최호윤,김지연,윤종훈,김만구 한국냄새환경학회 2021 실내환경 및 냄새 학회지 Vol.20 No.2

The degree and intensity of unpleasant and disgusting odors perceived through a person's sense of smell can vary depending on personal or social and cultural characteristics. In addition, it is not effective to manage odors solely on the basis of concentration levels because odors can be combined according to temperature, humidity, and frequency, so that they can be recognized differently even if the same person smells the same substance. The mobile odor application was developed to enable real time monitoring of odor characteristics reflecting the actual condition of the field. Accordingly, the Green Future Foundation, a civic group, conducted an environmental campaign to record and share the information of odors in school zone using the first version of the application. The real time monitoring of field odor was able to improve the problems of the current standard methods for the examination and assessment of odors. However, with regard to the first version of the application, the process and results of odor recording through odor measurement applied the direct olfactory method and were less relevant. Therefore, it was difficult to organize data due to duplicate selection. For that reason, this study was conducted to overcome the problems of the first version of the mobile application and to effectively and accurately reflect odors and personal characteristics. This odor application that has been developed is able to monitor and assess odors based on 5 features: classification, character, strength level, hedonic tone, and acceptability.