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이한솔 ( Hansol Lee ),황원중 ( Won Joung Hwang ),이현미 ( Hyun Mi Lee ),손동원 ( Dong Won Son ) 한국목재공학회 2016 목재공학 Vol.44 No.5
구리 기반 목재 방부제 중 MCQ를 이용하여, 목재 내 주입량에 따른 부후 특성을 조사하였다. 목재 시편에 주입량을 달리하여 약제를 주입한 후, 갈색부후균인 부후개떡버섯에 의한 방부효력 시험을 진행하였다. 이후, 질량감소율을 측정한 결과 무처리재는 35% 이상의 질량감소율을 보였으며, 실내 부후에 의한 MCQ 약제의 방부 효력을 나타내는 주입량은 3.99 ± 0.42 kg/m3로 나타났다. 광학현미경 및 전자현미경으로 시편의 3단면을 관찰했을 때, 무처리재와 낮은 주입량으로 처리한 처리재에서는 세포벽의 파괴와 함께 전체적으로 부후가 진행됨이 확인 되었고, 많은 수의 균사를 관찰할 수 있었지만, bore hole은 확인할 수 없었다. 본 연구에서 MCQ의 주입량에 따른 질량감소율 및 부후 현상이 크게 차이가 난 점 등을 고려하여, 국내 환경에서 MCQ의 주입량에 관한 적정성 검토가 필요하다고 생각되었다. In this study, MCQ (Micronized copper Quat) which was copper-based wood preservative, was investigated on decay properties by difference of the its infiltration volume. After pressure-treatment with different MCQ concentration, test specimens (Japanese Red Pine) were exposed by a brown-rot fungus (Fomitopsis palustris). At the end of the 12 weeks exposure to the fungus, untreated specimen was showed the mass loss of more than 35%, and the value of preservative effectiveness of MCQ by indoor decay was 3.99 ± 0.42 kg/m3. Therefore, MCQ should be pressure-injected at least 3.99 kg/m3. The three dimensional of the specimens were observed by using the light microscope and scanning electron microscope, Untreated and treatment specimens with low concentration generally had underwent serious decays and had a lot of fungal hyphae. Howere, the formation of bore hole by hyphae were not observed. Mass loss and decay properties of specimens were affected by amount of MCQ injection. Therefore, it is necessary to the review of the adequacy of the MCQ injection amount in domestic environments.
센서의 데이터 융합을 통한 수중운동체의 운동 계측 방법에 대한 연구
이한솔(Hansol Lee),김규현(Gyuhyun Kim),추진우(Jinwoo Choo),이지홍(Jihong Lee) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6
In this paper, we propose a navigation algorithm for high - precision measurement of the motion of an underwater vehicle through data fusion between an optical system, which is a global area sensor, and an IMU sensor, which is a local area sensor. Navigation algorithm is based on the Kalman filter structure and the results of two navigation algorithms with different IMU integration methods are compared and analyzed in a simulator of a dynamical based underwater vehicle simulation environment to evaluate the algorithm performance.
이한솔(Lee, Hansol),이정민(Lee, Jeongmin) 학습자중심교과교육학회 2020 학습자중심교과교육연구 Vol.20 No.19
본 연구는 디자인씽킹을 활용한 학습성과에 대한 메타분석을 통해 디자인씽킹 효과에 대한 통합적인 결론을 이끌어내는 데 목적이 있다. 이를 위해 2015년부터 2020년 2월까지 국내에서 발표된 학술지와 학위논문 중 총 30편의 논문을 선정하였고 R version 3.6.3 프로그램의‘meta’와 ‘metafor’, ‘ggplot2’ 패키지를 통해 총 99개의 효과크기를 분석하였으며, 연구결과는 다음과 같다. 첫째, 디자인씽킹을 활용한 학습이 전체 학습성과에 미치는 평균 효과크기는 0.78로 중간 효과크기를 보였으며 통계적으로 유의하였다. 둘째, 디자인씽킹을 활용한 학습이 학습성과의 영역별 효과에 미치는 평균 효과크기는 사회적(=.99), 인지적(=.79), 정의적(=.56) 영역 순으로 나타났으며, 사회적 영역은 큰 효과크기를, 인지적 영역과 정의적 영역은 중간 효과크기를 보였다. 셋째, 조절변인으로 선정한 연구 대상, 참여인원 수, 모둠구성원 수, 실시횟수, 회당 활동시간, 수업유형, 중심교과 및 프로그램, 디자인씽킹 적용 모형 및 단계, 아홉 가지 변인으로 선정하여 분석하였으며 모두 통계적으로 유의한 결과를 도출하였다. 이를 바탕으로 디자인씽킹을 활용한 학습에 대한 논의 및 시사점을 제안하였다. The purpose of this study is to draw an integrated conclusion about the effect of design thinking effect through the meta-analysis of learning outcomes using design thinking. For this study, a total of 30 papers were selected from academic journals and academic papers published in Korea from 2015 to 2020. A total of 99 effect sizes was analyzed through the meta , metafor , and ggplot2 packages of the R version 3.6.3 program. The results are as follows: First, the average effect size of learning using the design thinking on the overall learning performance was 0.78, showing a medium effect size and statistical significance. Second, the size of the average effect of learning using design thinking on the effect of each area on learning outcomes was large in the following order: social (=.99), cognitive (=.79), and affective (=.56) areas. The social domain showed a large effect size, and the cognitive domain and the affective domain showed intermediate effect sizes. Third, the average effect size of design thinking according to adjustment variables was analyzed by selecting nine variables, including the subject of the study, number of participants, number of group members, number of implementations, time per session, class type, main subject and program, design thinking application model and stage. All these variables reached statistically significant conclusions. Further implication and suggestions were discussed for this study.
상변화 물질 통합 조명기구의 냉방 에너지 저감 효과 분석
임한솔(Hansol Lim),이현화(Hyun Hwa Lee),최경석(Gyeong-Seok Choi),이용준(Yong-Jun Lee),강재식(Jae-Sik Kang) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.1
The phase chase material (PCM) integrated lighting fixture is suggested to reduce the heat from lightings in the building by inserting PCM in a cover of lighting. Thereby, the heat from the lightings expects to be absorbed to the PCM during the working time and rejected during the night time without occupants. The thermal performance of PCM integrated lighting fixture has been estimated using Physibel Voltra which provides three-dimensional transient heat transfer analysis. The results shows that it can successfully decrease the surface temperature of lighting about 2℃ and reduce the heating load within averaged 47%. Based on the analyzed results, the detail energy simulation has been performed using theoretical equations and empirical models from the Energyplus to evaluate the energy saving potential of PCM-integrated lighting fixture during the cooling season. The target building is normal office building with the variable air volume (VAV) system for air conditioning and ventilation. As results, the 5.8% of energy savings is expected from the chiller, pump and fan by using PCM-integrated lighting fixture. In addition, it can be expected that if the heating loads from lightings could be more decreased up to 10% by improving heat transfers of PCM layers, the energy consumption could be saved maximum 13.2% during the cooling season.