실내실험을 통한 아크릴레이트의 철도노반 보강 성능

윤환희(Hwan-Hee Yoon),손민(Min Son),김진환(Jin-Hwan Kim),김동현(Dong-Hyun Kim),김병현(Byung-Hyun Kim),정혁상(Hyuk-Sang Jung) 한국지반신소재학회 2021 한국지반신소재학회 논문집 Vol.20 No.1

본 논문에서는 침하된 철도노반 보강을 위한 아크릴레이트의 보강 성능에 대한 내용을 다루었다. 콘크리트궤도는 궤도유지보수 비용의 절감과 궤도파괴에 높은 저항력을 가지는 장점이 있다. 하지만 최근 콘크리트궤도에서의 노반침하가 발생하고 있고, 이에 대한 유지보수에 어려움을 겪고 있기 때문에 철도 운행에 안전이 우려되고 있다. 현재 국내에서는 콘크리트궤도의 노반침하에 대한 방안으로 궤도복원공법을 통한 유지보수를 시행중에 있지만 노반 자체를 보강할 수 없기 때문에 지속적인 재침하가 발생할 수 있으며, 철도노반 보강에 대한 연구 및 현장적용 사례는 극히 드물어 철도노반을 보강하기 위한 보강재료 및 공법의 개발이 요구된다. 따라서 본 논문에서는 철도노반의 보강재료로 아크릴레이트 약액을 선정하였으며, 실내실험을 통해 아크릴레이트 약액의 보강성능을 분석하였다. 그 결과 1×10<SUP>-4</SUP>cm/sec 투수계수에 침투가 가능하며, 일축압축강도 0.5MPa/30min, 강성 80MPa 이상 확보하는 것으로 분석되었다. This paper deals with the reinforcement performance of acrylate for reinforcing the settled railway roadbed. Concrete tracks have the advantage of reducing track maintenance costs and high resistance to track destruction. However, roadbed settlement is occurring in some construction sections, and the safety of railways is a serious concern because of difficulties in maintenance. Currently, maintenance through the track restoration method is being carried out in Korea as a way of roadbed settlement in concrete tracks, but continuous re-settlement can occur because the roadbed itself cannot be reinforced, and there are very few cases of reinforcement of railway roadbeds and field application. So the development of reinforcement materials and construction methods to reinforce railway roadbeds is required. Therefore, in this paper, acrylate was selected as reinforcement material for railway roadbed, and the reinforcement performance of acrylate was analyzed through experiment. As a result, it was analyzed that the acrylate can penetrate into a permeability coefficient of 1×10<SUP>-4</SUP> cm/sec, and secure uniaxial compression strength of 0.5 MPa/30min or more and stiffness of 80 MPa or more.

허구적 이야기에 대한 사회적 타당도 연구

윤환희(Hwan Hee Yoon),김정미(Jung Mee Kim) 한국언어치료학회 2016 한국언어치료학회 학술발표대회 논문집 Vol.2016 No.12

Purpose: Narrative skills are highly related to literacy and academic performance. It is important for children to assess narrative skills. We have used narrative evaluation system developed in Western culture in clinical setting as well as research field. It is necessary to examine social validity on Korean narrative of children. This study was to find out what "a good narrative" is and what " a poor narrative" is for Korean. Methods: Twenty laypersons, twenty elementary teachers, and twenty Speech Language Pathologists, total sixty participants were heard 16 narrative recordings produced by 3rd graders. (1) They were asked to mark holistic score to each narrative after listening the narrative and (2) describe features of "a good narrative" and "a poor narrative". (3) They were offered narrative rating scale composed of 5 items and a total of 20 questions and asked to rate on 7 point scale, then (4) we examined the relationship between the score of "good narrative" and "poor narrative" judged by them and narrative grammar score, which is objective measure, and the number of thesis. Results: The result of this study was more or less agree with the standard of good story that layperson, teachers, and SLP, and there were common features between "good story" and "poor story". Also, this result showed that this subjective judgment could have relevance with objective value. Conclusions: These results offer categories which are basically necessary in developing evaluation system of fictional narrative produced by children in Korea and the reason for that.

Fictional Narratives Assessment: Social Validation Study

윤환희(Hwan-Hee Yoon),김효선(Hyo Seon Kim),김정미(Jung-Mee Kim) 한국언어청각임상학회 2019 Communication Sciences and Disorders Vol.24 No.2

배경 및 목적: 본 연구에서는 학령기 아동이 산출한 허구적 이야기에 대한 일반인과 교사 언어재활사의 주관적 평가 기준을 파악하고자 하였다. 방법: 일반인, 교사, 언어재활사에게 아동의 이야기를 듣고 평가하도록 하였다. ‘좋은 이야기’로 평가 일치가 이루어진 이야기에 대해서 특징을 주관적으로 기술하도록 한 뒤 피험자 집단별로 비교 분석하였다. ‘좋은 이야기’와 ‘부족한 이야기’의 C-unit 수와 이야기문법 점수를 비교하였다. 마지막으로, 피험자들에게 이야기 평가에 있어서 5가지 범주 20개 항목에 대하여 중요도를 7점 척도로 표기하도록 하였다. 결과: 첫째 아동의 이야기의 50%에 대해서 ‘좋은 이야기’와 ‘부족한 이야기’로 평가가 일치하였다. 둘째, 피험자들은 평가 기준에 대해 통일성, 이야기문법 구조, 창의력과 상상력 및 말 관련 요소 순으로 기술하였다. 셋째, ‘좋은 이야기’는 ‘부족한 이야기’에 비하여 C-unit의 수가 많고 이야기문법 점수가 높았다. 넷째, 피험자는 연구자가 제시한 이야기 5가지 평가항목 중에서 이야기문법 범주 항목의 중요도를 가장 높게 평가하고 구문을 낮게 평정하였다. 논의 및 결론: 일반인 교사 언어재활사 모두 이야기를 평가할 때 텍스트 수준에서의 이야기 내용과 형식이 갖추어진 이야기를 ‘좋은 이야기’로 평가하였다. 일반인과 교사의 이야기 평가 기준은 대체로 일치하였으며 통일성, 이야기문법과 관련된 요소 이외에도 이야기의 창의력과 상상력에 대한 평가도 중요하게 간주하였다. Objectives: This study explored the social validation of narrative assessment. Methods: A total of 60 laypersons, teachers, and speech language pathologists (SLPs) used interval scaling to rate the quality of narratives produced by 16 third-grade children. They were asked to write their subjective criteria about what contributes to narrative quality evaluation. They also completed a 20-item questionnaire. They assigned a number from a 7-point scale to indicate the extent to which 20 items influenced their quality ratings. The 20 items related to either vocabulary, story grammar, syntax, fluency, or sparkle. ‘Good narratives’ and ‘poor narratives’ were compared on dimensions of the number of C-units and story grammar analysis. Results: Agreement among laypersons, teachers and SLPs was found for a subset of ‘good narratives’ and ‘poor narratives’, which constituted 50% of the total narratives. ‘Good narratives’ have more C-units and story grammar elements than ‘poor narratives’. The responses to questions about ‘good narrative quality’ fell into 12 categories based on similarity of content. Coherence, story grammar, Creativity & Imagination, and characteristics concerning speech were ranked high by all listener groups. Relative to these aspects, grammar was ranked low. Conclusion: The judgements of the overall narrative quality were related to textual-level dimensions of form and content but had little relation to sentential-level dimensions. Laypersons and teachers generally agreed on the criteria for evaluating narratives. They paid more attention to creativity and imagination than SLPs.

앵커 긴장력 상시확인을 위한 육안확인장치 개발

윤환희(Hwan Hee Yoon),이용주(Yong Joo Lee),오동욱(Dong Wook Oh),김동현(Dong Hyun Kim),정혁상(Hyuk Sang Jung) 한국암반공학회 2018 터널과지하공간 Vol.28 No.5

본 논문에서는 그라운드 앵커의 긴장력 손실에 대응하고자 긴장력 상시확인을 위한 앵커 긴장력 상시 육안확인장치에 대한 내용을 다루었다. 그라운드 앵커는 사회적 인프라 시설의 안정성을 확보하기 위해 시공되었지만 지속적인 긴장력 손실로 인해 시설물에 대한 안전이 심각하게 우려되고 있는 실정이다. 이에 앵커의 유지관리가 요구되지만 현재 잔존긴장력의 계측은 경제적인 측면을 고려하여 표본조사로 이루어지고 있어 정밀도에 대한 한계점을 지니고 있다. 따라서 본 논문에서는 앵커의 긴장력을 육안으로 확인할 수 있는 앵커 긴장력 상시 육안확인장치의 개발을 목적으로 개념설계, 실내 인장실험을 통한 규격화를 수행하였으며, 현장시험을 통해 성능을 확인하였다. This paper deals with visual confirmation device for tensile force verification in order to cope with tensile force loss of ground anchor. Ground anchors are constructed to ensure the stability of social infrastructure facilities, but continuous loss of tensile force is seriously concerned about safety of the facilities. This requires the maintenance of the anchors, but the current measuring of residual tensile force is done by sampling, taking into account economic aspects, which limits precision. In this paper, conducted a conceptual design, tensile experiment, and field test for the purpose of developing an anchor tensile force visual device to check the tensile force of the anchors.

대학원 생활을 마치며

윤환희(Hwan Hee Yoon) 대한토목학회 2022 대한토목학회지 Vol.70 No.9

운영중인 철도노반 보강을 위한 급속 보강재료 개발

윤환희(Hwan Hee Yoon),정혁상(Hyuk Sang Jung),손민(Min Son),김영제(Young Je Kim) 한국철도학회 2019 한국철도학회 학술발표대회논문집 Vol.2019 No.11

Fully Embedded LC Diplexer Passive Circuit into an Organic Package Substrate

이환희(Hwan Hee Lee),박재영(Jae Yeong Park),이한성(Han S. Lee),윤상근(Sang K. Yoon) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-

In this paper, fully embedded and miniaturized diplexer device has been developed and characterized for dual-band/mode CDMA handset applications. The size of the embedded diplexer is significantly reduced by embedding high Q circular spiral inductors and high DK MIM capacitors into a low cost organic package substrate. The fabricated diplexer has insertion losses and isolations of -0.5 and -23㏈ at 824-894㎒ and -0.7 and -22㏈ at 1850-1990㎒, respectively. Its size is 3.9㎜ × 3.9㎜ × 0.77㎜ (height). The fabricated diplexer is the smallest one which is fully embedded into a low cost organic package substrate.

고추 유전자원의 카로티노이드 조성 및 ASTA color 지수 분석

윤장언(Jang-Eon Yoon),김정봉(Jung-Bong Kim),김헌웅(Heon-Woong Kim),장길수(Kil-Soo Jang),고호철(Ho-Cheol Ko),장환희Hwan-Hee Jang,이성현Sung-hyen Lee,황유진(Yu-Jin Hwang) 한국육종학회 2015 한국육종학회지 Vol.47 No.3

Peppers (Capsicum annum L.) were harvested from 523 different genotypes cultivated at the Pepper Experiment Station in Gyeongsangbuk-do Agricultural Technology Administration of Yeongyang in the northeast region of Korea. The investigation of pepper with high carotenoids contents was quantitatively and qualitatively analysed by HPLC. The individual carotenoids were separated as capsanthin, lutein, zeaxanthin, β-cryptoxanthin, α-carotene and β-carotene by reverse-phase HPLC and identified with their external standards. The levels of total carotenoids and ASTA color values in 523 peppers were 0.5-84.8mg/100g of dry weight (DW) and 0.7-233.1, respectively. Individual carotenoid content and percentage of total carotenoid content were shown as follows: β-carotene (24.8%) (average 5.0 mg/100g DW) 〉 capsanthin (24.7%) (average 5.0 mg/100g DW) 〉 zeaxanthin (20.4%) (average 4.1 mg/100g DW) 〉 β-cryptoxanthin (14.8%) (average 3.0 mg/100g DW) 〉 lutein (13.3%) (average 2.7 mg/100g DW) 〉 α-carotene (2.0%) (average 0.4 mg/100g DW). As a result of plotting by using SIMCA, ASTA color values showed that the cluster is created.

Fully Embedded LC Diplexer Passive Circuit into an Organic Package Substrate

Hwan Hee Lee(이환희),Jae Yeong Park(박재영),Han Sung Lee(이한성),Sang Keun Yoon(윤상근) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.6

비개착터널 CMR공법의 앵커력 도출을 위한 실험적 연구

김진환(Jin Hwan Kim),정혁상(Hyuk Sang Jung),윤환희(Hwan Hee Yoon),사공명(Myung Sagong),이형훈(Hyoung Hoon Lee) 한국철도학회 2021 한국철도학회 학술발표대회논문집 Vol.2021 No.6