• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권4호
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• pp.1738-1756
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• 2020

To improve the accuracy and realism of the virtual surgical simulation system, this paper proposes an optimized mass-spring model with shape restoration ability based on volume conservation to simulate soft tissue deformation. The proposed method constructs a soft tissue surface model that adopts a new flexion spring for resisting bending and incorporates it into the mass-spring model (MSM) to restore the original shape. Then, we employ the particle swarm optimization algorithm to achieve the optimal solution of the model parameters. Besides, the volume conservation constraint is applied to the position-based dynamics (PBD) approach to maintain the volume of the deformable object for constructing the soft tissue volumetric model base on tetrahedrons. Finally, we built a simulation system on the PHANTOM OMNI force tactile interaction device to realize the deformation simulation of the virtual liver. Experimental results show that the proposed model has a good shape restoration ability and incompressibility, which can enhance the deformation accuracy and interactive realism.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.195-196
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• 2006

Direct laser sintering (DLS) technology for the resign coated sand is one of attractive technologies to produce molds and cores for the foundry industry rapidly and cost effectively. The objective of this case study is to develop casting pilot models using computer simulation technology, DLS RP machine and industrial computed tomography. The proposed casting design was verified by the Z-Cast software in the fields of fluid flow and solidification during the casting process. Casting parts with aluminum alloy using the post-curing treated sand moulds and cores are accurate to dimension and defect free.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2006년도 가을 학술발표논문집 Vol.33 No.2 (A)
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• pp.63-66
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• 2006

본 논문에서는 SNP데이터를 이용하여 간경화에 대한 감수성을 예측하기 위해 의사결정 트리를 이용하였다. 데이터는 간경화 환자와 정상환자 총 116명의 데이터를 사용하였으며, Feature 값으로는 간질환과 밀접한 연관성을 갖는 28개의 SNP데이터를 사용하였다. 실험방법은 각각의 SNP에 대하여 의사결정트리로 분류율을 측정한 후 가장 높은 분류율을 가지는 SNP부터 조합해 나가는 방식으로 C4.5 의사결정트리를 이용 leave-one-out cross validation으로 간경화와 정상을 구분하는 정확도를 측정하였다. 실험결과 간 질환 관련 SNP중 IL1RN-S130S, IRNGR2-Q64R, IL-10(-592), IL1B_S35S 4개의 SNP조합에서 65.52%의 정확도를 얻을 수 있었다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.938-943
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• 2006

The primary purpose of a computer room of data center and associated infrastructure is to support the operation of critical IT equipment. Traditionally, most owners of large critical data centers have been more than willing to accept a reasonable amount of computer room worker discomfort if necessary to support critical IT systems. All electrical equipment produces heat, which must be removed to prevent the equipment temperature from rising to an unacceptable level. Most information technology equipment and other equipment found in a data center or network room is air-cooled. Sizing a cooling system requires an understanding of the amount of heat produced by the equipment contained in the enclosed space, along with the heat produced by the other heat sources typically encountered.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2023년도 춘계학술발표대회
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• pp.345-347
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• 2023

Rust has gained popularity as a memory safe systems programming language. At the center of its memory safety is a strict memory ownership model with stringent rules enforced by the compiler. This paper aims to shed light on this memory safety model and the role smart pointers play towards its success. We study specific smart pointers, their purposes and contribution to Rust's memory safety. We further explore weaknesses of these smart pointers and their APIs, and provide scenarios under which they may lead to memory vulnerabilities in Rust programs.

• 한국컴퓨터산업학회논문지
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• 제4권12호
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• pp.1075-1082
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• 2003

본 논문에서는 움직임 추정을 위한 Efficient Center- Biased Hybrid Search (ECBHS) 알고리즘을 제안하였다. 제안된 알고리즘은 Center-Biased Hybrid Search (CBHS) 알고리즘에 기초하고 있다. 제안된 알고리즘은 +, X, 다이아몬드 탐색형태를 결합하여 탐색 윈도우의 중앙으로부터 3pel 이내에 분포하는 움직임 벡터를 찾는 과정에서 탐색점을 효과적으로 감소시킨다. ECBHS는 UCHDS 및 CBHS와 거치 동일한 움직임 추정 정확도를 유지하면서 움직임 추정을 위한 연산량을 효과적으로 감소시킨다. 제안된 알고리즘의 효율성을 실험을 통하여 확인하였다.

• International Journal of Contents
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• 제13권2호
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• pp.21-28
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• 2017

Abnormal data in the manufacturing process makes it difficult to find useful information that can be applied in data management for the manufacturing industry. It causes various problems in the daily process of production. An issue from the abnormal data can be handled by our method that uses big data and visualization. Visualization is a new technology that transforms data representation into a two-dimensional representation. Nowadays, many newly developed technologies provide data analysis, algorithm, optimization, and high efficiency, and they meet user requirements. We propose combined production of the data visualization approach that uses integrative visualization of sources of abnormal pattern analysis results. The perceived idea of the proposed approach can solve the problem as it also works for big data. It can also improve the performance and understanding by using visualization and solving issues that occur in the manufacturing process with a calendar heat map.

• Journal of the Optical Society of Korea
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• 제15권2호
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• pp.155-160
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• 2011

Lymph node metastasis is an important prognostic factor in cervical cancer patients. We report THz imaging for detecting micro-metastatic foci in the lymph nodes of early-stage uterine cervical cancer patients. Five paraffin-embedded metastatic lymph nodes from two cervical cancer patients were imaged using a THz time-domain spectroscopy system in the reflection mode. The size and shape of the tumor regions were compared with those from histopathologic examinations. The metastatic portions of lymph nodes as small as 3 mm were well delineated by THz imaging. The reflected peak amplitudes were lower in metastatic portions than in the normal portions of lymph nodes, and the difference in their peak-to-peak amplitudes was ~5%.

• 대한치과보철학회지
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• 제62권2호
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• pp.131-139
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• 2024

무치악 환자에서 임플란트를 이용한 보철치료는 임플란트 고정성 보철, 임플란트 융합 국소 의치, 하이브리드 보철물, 임플란트 유지 및 지지 피개의치 등의 다양한 방법이 있다. 본 증례에서는 중등도 이상의 만성 치주염에 이환 되어 전악 발치가 필요한 환자에서 computer guided surgery를 이용하여 계획된 위치에 임플란트를 식립하였다. 상악은 불량한 골질로 초기고정력이 충분하지 않아 지연 부하를 시행하였고 골 유착 기간 동안 임시 의치를 사용하였다. 하악은 안정적인 초기 고정을 얻어 즉시 부하를 이용하여 환자의 불편감을 감소시켰다. 임플란트 일차 안정은 즉시 부하를 얻기 위해 가장 중요한 요소로 여겨지기 때문에 수술 전 반드시 임상적, 방사선학적 평가를 통해 잔존 치조골 양 및 골질을 파악해야 한다.

• International Journal of Control, Automation, and Systems
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• 제3권4호
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• pp.648-648
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• 2005