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한종대(Jongdae Han),심재근(Jaekun Shim),이병정(Byungjeong Lee),오재원(Jaewon Oh),우치수(Chisu Wu) 한국정보과학회 2010 정보과학회 컴퓨팅의 실제 논문지 Vol.16 No.12
SaaS는 소프트웨어 개발 및 배포에 있어 전체적인 비용을 크게 줄일 수 있는 새로운 패러다임으로 분산 컴퓨팅, 그린 컴퓨팅, 클라우드 컴퓨팅 등의 최신 컴퓨팅 플랫폼에 있어 중요한 기반기술로 여겨지고 있다. 이러한 SaaS는 기존의 소프트웨어와 달리 높은 수준의 설정 가능성(Configurability)을 요구받고 있으며, 이에 따라 설정 요구사항(Configuration Requirements)의 추출에 있어 모든 설정 가능성을 빠짐 없이 고려하는 것이 매우 중요하다. 본 연구에서는 SaaS의 특성에 따라 각 요구사항에 대한 설정 가능성이 누락되지 않도록 결정할 수 있는 분류 기법을 제안한다. SaaS is an emerging paradigm for software development and deployment, expected to able to reduce cost. SaaS is also considered as a crucial technology for implementation of cutting-edge technology, such as distributed computing, green computing, and cloud computing. SaaS is requested to be configurable software to satisfy various customers, therefore it is very important to consider every configurability requirement during requirement elicitation. Our research suggests a classification technique to secure completeness of configuration requirement.
한종대(Jongdae Han),박근덕(Geunduk Park),우치수(Chisu Wu) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
XML을 이용하면 다이어그램에서 변경 내용을 검출하는 문제는 트리 구조에서 변경 내용을 검출하는 문제로 전환할 수 있다. 트리 구조의 여러 버전(version) 간에 형제(sibling) 노드의 순서가 유지되지 않는 조건하에서, 트리 구조의 변경 내용을 검출하는 문제는 NP-complete임이 증명되어 있다. 그러므로 본 논문에서는, 트리 연산에 몇 가지 제한을 부가하여, 빠른 시간 내에 최적에 가까운 변경 내용을 검출하는 방법을 제안한다.
3D 얼굴 모델 기반의 GAN을 이용한 게임 캐릭터 회전 기법
김한동(Handong Kim),한종대(Jongdae Han),양희경(Heekyung Yang),민경하(Kyungha Min) 한국게임학회 2021 한국게임학회 논문지 Vol.21 No.3
본 논문은 게임 캐릭터 얼굴 일러스트레이션에 적용할 수 있는 안면 회전 기술(Face rotation) 기술을 제안한다. 기존의 진행된 연구들은 실제 사람의 얼굴 데이터에 대해서로 데이터를 한정하였으며 방대한 양의 데이터를 필요로 하였고 합성된 결과물이 좋지 못한 문제가 있었다. 본 논문에서는 기존 연구들의 존재하는 문제를 해결하기 위해 다음과 같은 방법을 도입하였다. 첫째, 입력 이미지가 갖고 있는 특징을 입힌 3D 모델을 회전시키고 다시 2D 이미지로 렌더링하여 학습 및 평가에 필요한 데이터 셋을 구축하였다. 둘째, 3D 모델을 통해 구축된 데이터에서 다양한 각도의 특징을 학습할 수 있는 적대적 생성 모델(Generative Adversarial Networks)을 설계하여 입력된 이미지를 원하는 각도로 합성할 수 있다. 논문에서는 실제 게임캐릭터 얼굴 일러스트레이션 합성 결과를 제시한다. 합성 결과를 통해 논문에서 제안하는 방법이 잘 동작함을 확인할 수 있다. This paper shows the face rotation applicable to game character facial illustration. Existing studies limited data to human face data, required a large amount of data, and the synthesized results were not good. In this paper, the following method was introduced to solve the existing problems of existing studies. First, a 3D model with features of the input image was rotated and then rendered as a 2D image to construct a data set. Second, by designing GAN that can learn features of various poses from the data built through the 3D model, the input image can be synthesized at a desired pose. This paper presents the results of synthesizing the game character face illustration. From the synthesized result, it can be confirmed that the proposed method works well.
김상근(Sangkeun Kim),한종대(Jongdae Han) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
Rolling bearings are classified one of the most important machine elements. High performance characteristics such as long life, low torque, small temperature rise, low noise, low wear and high corrosion resistance are required for rolling bearings. The grease life will effectively limit the bearing life. Therefore higher performance of rolling bearing greases is required to improve bearing lubrication. Large differences in the grease performance depending on the composition were observed. In this study, five optimum greases with different composition were selected using the powerful Robust Engineering Orthogonal Array and SSRED (Six Sigma Robust Engineering Design) program. Then the performance of these optimum greases was tested. Large differences in the grease performance depending on the composition were observed. A strong correlation was found between grease life and OIT value The life time of optimum grease using OIT value was longer than that of the optimum grease using dropping point.
최적합 구름 베어링용 Urea계 그리이스의 특성평가 연구
김상근(Sangkeun Kim),박창남(Changnam Park),한종대(Jongdae Han) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.39 No.-
Rolling bearings are assorted one of the most important machine elements. The various functions of bearings are greatly influenced by grease. and higher performance of rolling bearing greases is required to improve rolling bearing lubrication. The two conditions for optimum grease synthesis were selected by SSRED (Six Sigma Robust Engineering Design) program by using dropping points and OIT values respectively. And the optimized two urea/ether oil greases were synthesized to compare the performance. The typical physical properties of grease were investigated. And life test of these greases was conducted by rolling bearing grease life tester. The characteristics of the greases before and after life test were investigated using FTIR. microscope. SEM. TG/DSC, OIT and TAN meter. The optimized two greases showed longer life time than typical urea/ether oil grease. The optimized grease by means of OIT value showed higher performance such as long life time. low TAN value and high oil bleeding amount in comparison with the optimized grease using dropping point.
최적합 구름 베어링용 Urea계 그리이스의 특성평가 연구
김상근(Sangkeun Kim),박창남(Changnam Park),한종대(Jongdae Han) 한국트라이볼로지학회 2005 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.21 No.1
Rolling bearings are assorted one of the most important machine elements. The various functions of bearings are greatly influenced by grease, and higher performance of rolling bearing greases is required to improve rolling bearing lubrication. The two conditions for optimum grease synthesis were selected by SSRED (Six Sigma Robust Engineering Design) program by using dropping points and OIT values respectively. And the optimized two urea/ether oil greases were synthesized to compare the performance. The typical physical properties of grease were investigated. And life test of these greases was conducted by rolling bearing grease life tester. The characteristics of the greases before and after life test were investigated using FTIR, microscope, SEM, TG/DSC, OIT and TAN meter. The optimized two greases showed longer life time than typical urea/ether oil grease. The optimized grease by means of OIT value showed higher performance such as long life time, low TAN value and high oil bleeding amount in comparison with the optimized grease using dropping point.
최적화 후의 깊은홈 볼 베어링용 그리이스의 특성과 수명연구
김상근(Sangkeun Kim),한효섭(Hyoseup Han),한종대(Jongdae Han) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.11
Rolling bearings are assorted one of the most important machine elements. High performance characteristics such as long life, low torque, small temperature rise, low noise, low wear and high corrosion resistance are required for rolling bearings. The grease life will effectively limit the bearing life. Therefore higher performance of rolling bearing greases is required to improve bearing lubrication. Large differences in the grease performance depending on the composition were observed. In this study, five optimum greases with different composition were selected using the powerful Robust Engineering Orthogonal Array and SSRED (Six Sigma Robust Engineering Design) program. Then the performance of these optimum greases was tested. Large differences in the grease performance depending on the composition were observed. A strong correlation was found between grease life and OIT value The life time of optimum grease using OIT value was longer than that of the optimum grease using dropping point.