• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• 제19권4호
• /
• pp.409-416
• /
• 2015

In many practical applications, we face the problem of reconstruction of an unknown function sampled at some data points. Among infinitely many possible reconstructions, the thin plate spline interpolation is known to be the least oscillatory one in the Beppo-Levi semi norm, when the data points are sampled in $\mathbb{R}^2$. The traditional proofs supporting the argument are quite lengthy and complicated, keeping students and researchers off its understanding. In this article, we introduce a simple and short proof for the optimal reconstruction. Our proof is unique and reguires only elementary mathematical background.

• 대한기관식도과학회지
• /
• 제1권1호
• /
• pp.82-93
• /
• 1995

Three-dimensional reconstruction of computed tomographic image(3D CT) is a well-established imaging modality which has been investigated in various clinical settings. It is commonly performed in case of congenital or developmental abnormalities, and traumatic fracture of skull and face that requires reconstruction of osseous structure. However reporting the 3D CT in laryngeal or tracheal stenosis is rare and its results are obscure. The authors performed 3D CT in six cases of tracheal stenosis and found diagnostic value of 3D CT. A Comparision of diagnostic information obtained from plain X-ray, 2D CT and 3D CT has performed in total six cases of tracheal stenosis. Surgical treatment of the tracheal stenosis was following in these cases : tracheal end to end anastomosis In 1 case, laryngotracheal end to end anastomosis in 2 cases. 3D CT information was compared with operative finding. In two of six cases, satisfactory information was not obtained from 3D CT in evaluating an exact stenosis of trachea. Future, it will be helped in evaluating of tracheal stenosis by 3D CT.

• 한국진공학회지
• /
• 제4권4호
• /
• pp.367-372
• /
• 1995

We investigate the Au(001) surface reconstruction, numerically, by Molecular Dynamics (MD) simulation. We find that the top-most layer of Au(001) surface is reconstructed to a contracted hexagonal face, and relaxed about 0.05$\AA$ upward at room temperature. The contraction ratio with respect to a unreconstructed Au(111) surface is about 3.5%. The hexagonal layer is slightly distorted and buckled. The surface corrugation is found to be about 0.28$\AA$ on average. In our earlier work we have predicted the in-plane orientation of the reconsturcted layer to be either $0^{\circ}$ or $0.7^{\circ}$ depending on the size of the cluster. However, we find only $0.0^{\circ}$ in this simulation because the size of the cluster correspoding to the $0.7^{\circ}$ orientation is larger than the current limitation of MD simulation. These findings are in good agreement with experimental results.

• Applied Microscopy
• /
• 제46권4호
• /
• pp.171-175
• /
• 2016

A distinctive neuronal network in the brain is believed to make us unique individuals. Electron microscopy is a valuable tool for examining ultrastructural characteristics of neurons, synapses, and subcellular organelles. A recent technological breakthrough in volume electron microscopy allows large-scale circuit reconstruction of the nervous system with unprecedented detail. Serial-section electron microscopy-previously the domain of specialists-became automated with the advent of innovative systems such as the focused ion beam and serial block-face scanning electron microscopes and the automated tape-collecting ultramicrotome. Further advances in microscopic design and instrumentation are also available, which allow the reconstruction of unprecedentedly large volumes of brain tissue at high speed. The recent introduction of correlative light and electron microscopy will help to identify specific neural circuits associated with behavioral characteristics and revolutionize our understanding of how the brain works.

• 대한화상학회지
• /
• 제24권2호
• /
• pp.60-63
• /
• 2021

In the face, the nose plays an important role in both function and appearance. Among the subunits on the nose, the alar is a critical nasal structure of high aesthetic value. Previously, many surgeons have insisted that structural support should be added to the reconstruction of alar and particularly so in the case of a full-thickness defect. In a 58-year-old male patient who had a third-degree burn injury and full-thickness defect in most of the left nasal alar, forehead flap surgery alone was successfully performed without structural support.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2023년도 봄 학술논문 발표대회
• /
• pp.157-158
• /
• 2023

Building Information Modeling (BIM) design has been mandatory in Korea since 2016, and it has been gradually expanding in the industry, with a slow attempt to apply it in remodeling constructions. This is because Korea is facing a situation where many buildings are over 30 years old and require remodeling or reconstruction. The remodeling industry is also a growing market, as it saves construction time and cost compared to reconstruction. BIM is an ideal technology element for a competitive remodeling construction, as remodeling constructions face a complicated construction process from the start, including demolition, maintenance, and reinforcement to save the change process. However, there are still limitations in applying BIM to remodeling constructions, due to considerations of the existing building and the complicated requests of the inhabitants. BIM still has technical and environmental limitations for general use. In this study, I analyzed BIM application cases from existing studies and suggest what improvement points should be strengthened.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2023년도 봄 학술논문 발표대회
• /
• pp.211-212
• /
• 2023

Building Information Modeling (BIM) design has been mandatory in Korea since 2016, and it has been gradually expanding in the industry, with a slow attempt to apply it in remodeling constructions. This is because Korea is facing a situation where many buildings are over 30 years old and require remodeling or reconstruction. The remodeling industry is also a growing market, as it saves construction time and cost compared to reconstruction. BIM is an ideal technology element for a competitive remodeling construction, as remodeling constructions face a complicated construction process from the start, including demolition, maintenance, and reinforcement to save the change process. However, there are still limitations in applying BIM to remodeling constructions, due to considerations of the existing building and the complicated requests of the inhabitants. BIM still has technical and environmental limitations for general use. In this study, I analyzed BIM application cases from existing studies and suggest what improvement points should be strengthened.

• ETRI Journal
• /
• 제46권3호
• /
• pp.513-525
• /
• 2024

Deep neural networks trained on labeled medical data face major challenges owing to the economic costs of data acquisition through expensive medical imaging devices, expert labor for data annotation, and large datasets to achieve optimal model performance. The heterogeneity of diseases, such as Alzheimer's disease, further complicates deep learning because the test cases may substantially differ from the training data, possibly increasing the rate of false positives. We propose a reconstruction-based self-supervised anomaly detection model to overcome these challenges. It has a dual-subnetwork encoder that enhances feature encoding augmented by skip connections to the decoder for improving the gradient flow. The novel encoder captures local and global features to improve image reconstruction. In addition, we introduce an entropy-based image conversion method. Extensive evaluations show that the proposed model outperforms benchmark models in anomaly detection and classification using an encoder. The supervised and unsupervised models show improved performances when trained with data preprocessed using the proposed image conversion method.

• Archives of Plastic Surgery
• /
• 제51권3호
• /
• pp.290-294
• /
• 2024

Giant congenital nevi, especially on the head and neck, pose a challenge for plastic surgeons. This requires extensive experience in detailed planning, combining different techniques, and selecting appropriate materials for reconstruction. There have been reports of using a tissue expander, serial resection method, and full-thickness skin grafts for this type of nevus. However, the best way to completely remove a giant congenital nevus is endless. In this article, we would like to present a case of a left hemifacial giant congenital nevus in which we used multiple tissue expansion to fully replace the nevus, along with some of our modification techniques.

• 한국건설관리학회:학술대회논문집
• /
• 한국건설관리학회 2004년도 제5회 정기학술발표대회 논문집
• /
• pp.232-235
• /
• 2004

공동주택 재건축사업은 조합의 비전문성에 의한 사업지연, 사업주체들간의 분쟁, 그리고 비용상승과 같은 많은 문제점을 가지고 있으며, 사업시행절차가 복잡하고 사업기간이 길며, 많은 사업주체들이 참여하기 때문에 항상 불확실성에 직면하고 있다. 따라서 성공적으로 재건축사업을 추진하기 위해선 재건축사업의 추진과정에서 발생하는 불확실한 요인들을 제거 할 수 있는 리스크 관리 프로세스의 구축이 필요하다. 본 연구는 공동주택 재건축 사업에서 인지되는 리스크 요인을 체계적이고 효율적으로 관리할 수 있는 리스크 분석방법을 제안하고자 한다. 본 연구에서 제안한 리스크 분석방법은 객관적이고 체계적인 기초자료가 부재한 상태에서 담당자들의 경험에 의존하여 이루어졌던 공동주택 재건축사업에서의 리스크 관리를 객관적으로 수행할 수 있는 기초자료로서의 활용성이 기대된다.