다 성분 단일 합금 타겟을 사용하여 질소유량의 변화에 따라 증착한 Mo-Cu-Cr-(N) 박막의 기계적 특성 및 마찰 특성에 대한 연구

김수빈,박현준,이선영,문경일 한국표면공학회 2020 한국표면공학회 학술발표회 초록집 Vol.2020 No.12

군말뚝 기초 하부 병렬터널 굴착 시 전단변형 거동 특성

김수빈,오영석,이용주 사단법인 한국터널지하공간학회 2024 한국터널지하공간학회논문집 Vol.26 No.1

In tunnel construction, the stability is evaluated by the settlement of adjacent structures and ground, but the shear strain of the ground is the main factor that determines the failure mechanism of the ground due to the tunnel excavation and the change of the operating load, and can be used to review the stability of the tunnel excavation and to calculate the reinforcement area. In this study, a twin tunnel excavation was simulated on a soft ground in an urban area through a laboratory model test to analyze the behavior of the twin tunnel excavation on the adjacent pile grouped foundation and adjacent ground. Both the displacement and the shear strain of ground were obtained using a close-range photogrammetry during laboratory model test. In addition, twodimensional finite element numerical analysis was performed based on the model test. The results of a back-analysis showed that the maximum shear strain rate tends to decrease as the horizontal distance between the pillars of the twin tunnel and the vertical distance between the toe of the pile group and the crown of the tunnel were decreased. The impact of the second tunnel on the first tunnel and pile group was decreased as the horizontal distance between the pillars of the twin tunnel was increased. In addition, the vertical distance between the toe of the pile group and the crown of the tunnel had a relatively greater impact on the shear strain results than the horizontal distance of the pillars between the twin tunnels. According to the results of the close-range photogrammetry and numerical analysis, the settlement of adjacent pile group and adjacent ground was measured within the design criteria, but the shear strain of the ground was judged to be outside the range of small strain in all cases and required reinforcement.

CNN을 이용한 Al 6061 압출재의 표면 결함 분류 연구

김수빈,이기안 한국소성∙가공학회 2022 소성가공 : 한국소성가공학회지 Vol.31 No.4

Convolution Neural Network(CNN) is a class of deep learning algorithms and can be used for image analysis. In particular, it has excellent performance in finding the pattern of images. Therefore, CNN is commonly applied for recognizing, learning and classifying images. In this study, the surface defect classification performance of Al 6061 extruded material using CNN-based algorithms were compared and evaluated. First, the data collection criteria were suggested and a total of 2,024 datasets were prepared. And they were randomly classified into 1,417 learning data and 607 evaluation data. After that, the size and quality of the training data set were improved using data augmentation techniques to increase the performance of deep learning. The CNN-based algorithms used in this study were VGGNet-16, VGGNet-19, ResNet-50 and DenseNet-121. The evaluation of the defect classification performance was made by comparing the accuracy, loss, and learning speed using verification data. The DenseNet-121 algorithm showed better performance than other algorithms with an accuracy of 99.13% and a loss value of 0.037. This was due to the structural characteristics of the DenseNet model, and the information loss was reduced by acquiring information from all previous layers for image identification in this algorithm. Based on the above results, the possibility of machine vision application of CNN-based model for the surface defect classification of Al extruded materials was also discussed.

A tentative evaluation for population establishment of Bactrocera dorsalis (Diptera: Tephritidae) by its population modeling: Considering the temporal distribution of host plants in a selected area in Jeju, Korea

김수빈,김동순 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.2

The Oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae) is a destructive fruit pest in a wide range of cultivated fruit crops and wild plants. This species is a potentially highly invasive fruit fly to Jeju area of Korea. This study was conducted to evaluate the effect of host plants distributed temporally on the population development of B. dorsalis. The temperature-dependent bionomic data for a synonymous group of B. dorsalis, including B. philippinensis, B. papayae, and B. invadens were collected from previous publications and combined to construct a population model of this pest and its thermal constant. We developed a stage-transition model of eggs, larvae and pupae, and an oviposition model for basic population modeling of the four common strains. We investigated the abundance of the host plants of B. dorsalis in a selected site in Jeju and parameterized them in terms of temporal availability to incorporate into the population model. The contribution of host plants for the population growth of B. dorsalis in the selected site was different according to the group of host plants. For example, B. dorsalis populations largely decreased by 93%, when host plants belong to Moraceae (mainly Ficus sp.) were removed in the simulation. Also, we found that the host plants of Prunus persica, Ficus carica, P. mume, Eriobotrya japonica in this order contributed greatly to population abundance of B. dorsalis in the selected area, which was important in terms of mid-season host plants connecting the early adult population of B. dorsalis to citrus plants in the late season. Finally, we discussed a seasonal management strategy against B. dorsalis while considering the availability of host plants and the biology of this fruit fly in an invaded area.

뉴스페이스 시대의 지속가능 발전 목표 달성을 위한 지속 가능 디자인 접근 요인 탐구

김수빈 한국디자인트렌드학회 2024 한국디자인포럼 Vol.29 No.1

Background In the New Space era, the importance of international cooperation for the peaceful use and sustainability of space is emphasized, and various international cooperation programs are being attempted. According to this trend of the times, there is a need for discussion on the role and direction of design in the New Space era. Through a sustainable design approach, we aim to explore the role of design for sustainable development in the New Space era. Methods Conducting prior research and literature research, reviewed New space's characteristics, design application status, and limitations. Sustainable development goals and sustainable design approach factors and action items were derived. A schematic was prepared to understand the relationship between these factors, and the schematic was created by collecting the opinions of experts for each item on seven cases of space cooperation programs. Result In the prepared diagram, detailed goal items related to the contextual axis of sustainable design corresponding to the TBL category of the space cooperation program were visualized. In addition, the degree of correlation with sustainable design approach factors and practical factors were identified and visualized. Conclusion Sustainable design in the new space era requires a flexible approach tailored to the characteristics of individual activities within the core category of sustainability. Depending on the scope of the program's activities, the design strategy requires a multidimensional approach. The approach of this study is meaningful as an exploratory attempt on how to apply sustainable design in space cooperation programs in the New Space era.

신설 터널굴착이 지중 군말뚝 및 인접 터널의 거동에 미치는 영향 연구

김수빈,오동욱,조현준,이용주 대한토목학회 2022 대한토목학회논문집 Vol.42 No.4

The demand for underground infrastructures such as tunnels is expanding due to rapid urbanization. Tunnels in urban areas are usuallyconstructed adjacent to structures supported by piles. Therefore, a proper understanding of pile-tunnel interaction due to tunnel excavation activities is vital. Thus, in this study, a numerical analysis is conducted to analyze pile settlements, ground surface settlements and shear deformations above an existing tunnel subject to the presence of an adjacent tunnelling, with vertical offsets, the number of piles and the pile spacing considered as variables in the analysis. The results show that the vertical offsets between the tunnel crown and the pile tip generatelarger settlement than the pile spacing. In addition, the vertical offset shows an inversely proportional relationship to the shear deformation due to new tunnelling. 도시의 대형화로 인해 도심지 지하공간은 점점 고밀화되어 가고 있으며, 지하공간 활용에 대한 수요 또한 급격히 증가하고 있다. 도심지에서는 상부뿐만 아니라 지중에도 통신, 교통 등을 위한 지중 구조물 또한 존재하고 있다. 이러한 도심지의 지중에 신설 구조물을 시공할 경우, 상부 및 지중에 존재하는 인접 구조물과의 상호거동에 대한 이해가 필수적이다. 따라서 본 연구에서는 기존 군말뚝 및 운영중 터널에 인접하여 터널이 신설될 경우 침하와 지중의 전단변형을 유한요소해석을 통해 분석한다. 운영 중 터널-말뚝 간의 이격거리, 말뚝 개수, 말뚝 중심간격 등이 변수로 고려되었으며, 수치해석을 통해 말뚝 및 인접 지반 침하를 비교한 결과, 말뚝의 중심간격보다 군말뚝-신설 터널 수직이격거리 및 운영중 터널-신설 터널 간의 수평이격거리가 침하에 더 큰 영향을 미치는 것으로 나타났다. 또한, 구조물 간의 이격거리 증가에 따라 신설 터널 굴착에 따른 전단변형률이 미치는 영향이 감소되는 것으로 나타났다.

Synthesis of Hierarchically Porous Polymers by Hyper-cross-linking of Block Polymer Precursors

김수빈,서명은 한국고분자학회 2019 한국고분자학회 학술대회 연구논문 초록집 Vol.44 No.2

단위지역 내 기주식물 분포상을 이용한 오리엔탈과실파리 정착 및 발생 평가 방안

김수빈,권순화,김용근,김태옥,오성오,김동순 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.10

국내 침입이 우려되는 오리렌탈과실파리(Bactrocera dorsalis)는 동남아 원산으로 연 3~5회 발생하며 원칙적으로 특정의 월동태는 없으나, 중국남부에서는 번데기로 월동 가능성이 있는 것으로 알려져 있다. 침입시 막대한 박멸비용과 작물의 경제적 손실을 유발하므로 유입방지를 위한 노력과 더불어 침입시 조기 발견하여 박멸조치를 취하는 것이 필요하다. 본 연구는 오리엔탈과실파리 박멸전략 수립에 필요한 침입개체군의 지속적 정착 가능성을 평가하기 위하여 단위지역 내 생물 및 비생적 정보를 수집 및 종합하여 평가하였다. 기존의 침입해충 정착평가는 주로 비생물적 환경인 기후적합성에 초점을 맞추거나 기주식물의 존재여부를 바탕으로 이루어졌는데, 기주식물의 공간 및 시간적 분포가 중요한 요소로 나타났다. 이동성이 우수한 오리엔탈과실파리는 기주식물의 공간적 이질성을 쉽게 극복할 수 있기 때문에(패치 이동) 기주식물의 시간적 분포(단절)가 지속적 정착에 매우 중요한 요소로 판정되었다. 온도의존 발육모형을 기반으로 개체군모형을 수립하고 기주식물의 시공간적 분포를 매개변수화하여 시뮬레이션을 실시하였다. 실제 단위지역 내 환경에서 월동 후 봄부터 늦여름까지는 절대적인 기주식물의 결핍현상이 나타났으며, 초가을부터 개체군 대발생을 유도할 수 있는 먹이자원이 형성되고 있었다. 기주식물의 시간적 분포상에 따라서 오리엔탈과실파리의 개체군 크기는 크게 변동되었고, 기주결핍 기간과 성충수명의 관계성이 후기 대발생의 한 요인이 될 수 있었다. 기타 단위지역내 총 먹이자원상에서 증식 가능한 개체군 크기와 대발생을 차단하는 초기 박멸전략에 대하여 고찰하였다.

티백 내 미세플라스틱 분석

김수빈,추의성,김주양,정정무,정재학 한국분석과학회 2020 학술대회논문집 Vol.2020 No.6

발달지연으로 인한 언어장애가 있는 아동의 놀이치료 사례연구

김수빈,이숙 한국아동심리치료학회 2008 한국아동심리치료학회지 Vol.3 No.2

인간은 의사소통의 한 수단인 언어를 사용하여 자신의 욕구를 충족시킬 수 있고, 다른 사람들과의 관계를 형성하고 유지하며 주위 환경을 이해하고 조정함으로써 사회에 적응할 수 있게 된다(이규식 등, 2004). 이처럼 인간은 태어나면서부터 사회적 관계를 맺으며 사회화를 경험하는데, 이러한 과정에서 언어는 자신의 생각과 의사를 전달하기 위한 중요한 요소라고 할 수 있다. 즉 언어는 인간에게 자연스러우면서도 필수적으로 지녀야 하는 사회적 삶에 필수적인 요소로 인식되고 있다. 따라서 의사소통의 심각한 장애는 개인에게 지대한 영향을 미치며, 아동의 사회적, 정서적, 교육적 면에 미치는 영향 또한 상당하다고 볼 수 있다.