• International Journal of Precision Engineering and Manufacturing
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• v.2 no.3
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• pp.27-33
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• 2001

The aim of the present work is to propose a model for Computer Aided programming of numerical Control lathe. This model is based on the concept by features. It has been developed in an Artificial Intelligence environment, that offers a rapidity as well as a precision for NC code elaboration. In this study a pre-processor has been elaborated to study the geometry of turning workpiece. This pre-processor is a hybrid system which combine a module of design by features and a module of features recognition for a piece provided from an other CAD software. Then, we have conceived a processor that is the heart of the CAD/CAM software. The main functions are to study the fixture of the workpiece, to choose automatically manufacturing cycles, to choose automatically cutting tools (the most relevant), to simulate tool path of manufacturing and calculate cutting conditions, end to elaborate a typical manufacturing process. Finally, the system generates the NC program from information delivered by the processor.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.334-339
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• 2006

인터넷을 통한 고도의 정보 통신망 구축은 제한적이던 네트워크의 침입에 대한 위험성을 증대시켰으며, 그에 따라 안전성 있는 웹 서비스 구축이 무엇보다 중요한 문제로 자리 잡고 있다. 안전성 있는 인터넷 서비스를 구성하기 위한 하나의 일환으로, 본 논문에서는 사용자에게 안전한 웹 서비스 제공을 위한 실시간 웹 무결성 검증 시스템을 제안하고자 한다. 프록시 서버와 웹 서버의 연동 보안 기술로, 데이터 무결성 검증을 위한 SHA-1과 N-gram의 효율적인 hybrid 방식 기법을 이용한 이 시스템은 XSS 취약점 공격, SQL 삽입 공격, 파일 업로드 취약점 공격 등을 방어하고 정부기관 및 기업뿐만이 아닌 홈네트워크 환경에서도 안전한 보안 서비스를 제공할 수 있을 것이다.

• Bulletin of the Korean Chemical Society
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• v.32 no.12
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• pp.4195-4198
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• 2011

Intramolecular ${\pi}-{\pi}$ and ${\sigma}-{\pi}$ interactions are omnipresent for numerous energetic and structural phenomena in nature, and the exact description of these nonbonding interactions plays an important role in the accurate prediction of the three-dimensional structures for numerous interesting molecular systems such as protein folding and polymer shaping. We have selected two prototype molecular systems for benchmarking calculations of intramolecular ${\pi}-{\pi}$ and ${\sigma}-{\pi}$ interactions. Accurately describing conformational energy of such systems requires highly elaborate but very expensive ab initio methods such as coupled cluster singles, doubles, and (triples) (CCSD(T)). Our calculations reveal a double hybrid density functional incorporating dispersion correction (B2PLYP-D) that agrees excellently with the CCSD(T) results, indicating that B2PLYP-D can serve as a practical method of choice.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.460-463
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• 2013

스마트 기기의 보급 활성화로 최근 주목받고 있는 스마트교육은 다양한 영역을 포함하고 있지만 주로 스마트 디바이스를 활용한 학습방법과 교육콘텐츠 개발 등 학습역량을 높이는데 집중되어 있다. 그러나 성공적인 교육을 위해서는 무엇보다도 학교생활 전반에 걸쳐 학습자와의 소통과 교감이 우선되어야 한다. 이를 위해서 대학과 일선 학과에서는 학생들과 소통을 위해 오프라인 기반 게시판이나 홈페이지를 활용해왔지만 더 이상 스마트 기기에 익숙해져 있는 학생들과 효과적으로 소통을 할 수 있는 수단이 되지 못하고 있다. 본 논문에서는 이러한 문제를 해결하기 위해서 모바일 웹앱기반 학생용 스마트 플래너 시스템을 제안한다. 제안하는 시스템은 학과의 프로그램 공지와 같은 단순 정보 전달에 국한되지 않고 학생이 스스로 학사일정을 체크하면서 자기 관리를 할 수 있는 수단을 제공해준다. 또한 다양한 학과 프로그램에 학생들이 자발적으로 참여할 수 있도록 유도하기 위한 인센티브 시스템 운영, SNS를 활용한 상호 커뮤니케이션을 포함하고 있다.

• Transactions of the KSME C: Technology and Education
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• v.5 no.1
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• pp.63-67
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• 2017

Nobody deny that Machine Tool has leaded to the development of mechanical technology as it is known for long time. According to this, it has always been changed newly by appling advanced technology. This paper introduces the evolution history of machine tools and describes how the ICT is applied to develop a new type of machine tool. For that, it has been shown what kind of elementary technologies are required. The future vision has also been concluded in this paper.

• Journal of the Korean earth science society
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• v.35 no.5
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• pp.362-374
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• 2014

This study investigated the initial mass function (IMF) and star formation history of high-mass stars in the Small Magellanic Cloud (SMC) using a population synthesis technique. We used the photometric survey catalog of Lee (2013) as the observable quantities and compare them with those of synthetic populations based on Bayesian inference. For the IMF slope (${\Gamma}$) range of -1.1 to -3.5 with steps of 0.1, five types of star formation models were tested: 1) continuous; 2) single burst at 10 Myr; 3) single burst at 60 Myr; 4) double bursts at those epochs; and 5) a complex hybrid model. In this study, a total of 125 models were tested. Based on the model calculations, it was found that the continuous model could simulate the high-mass stars of the SMC and that its IMF slope was -1.6 which is slightly steeper than Salpeter's IMF, i.e., ${\Gamma}=-1.35$.

• Journal of information and communication convergence engineering
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• v.2 no.2
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• pp.106-109
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• 2004

This study designs a load balancer via direct routing that share a virtual service on a single IP address in the Linux system and suggests an efficient load balancing method to improve transmission speed in the web server cluster environment. It will increase performance and scalability with fast packet transfer and removing bottleneck problem by using TCP Splicing and Content-Aware Distributor method. This method is expected to be the noticeable technology that provides an important interface, which make application services for e-commerce effectively be applied to high-speed network infrastructure. At this time, it is required to study further on the optimum balancing method in the web server cluster environment so as to apply the hybrid (optimum load balancing method by software and hardware) method and improve the reuse of security cession based on high-speed TCP connections.

• Proceedings of the KAIS Fall Conference
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• 2007.11a
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• pp.89-91
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• 2007

본 논문은 인간의 어휘획득(Lexical Aquisition)과정을 하이브리드(hybrid)한 형태의 계산주의적(Computational) 모델을 설계,반복 실험을 통해 인지신경기반의 어휘습득 모델을 구현하고 실험하였다. 이 연구를 통해 인간의 어휘획득 과정을 모사(simulate)할수 있었고, 이로인해 인지신경기반 어휘 정보처리 시스템 개발을 위한 자동어휘 획득, 심성 어휘집 표상, 어휘 인식(word recognition)의 계산주의적 모델 개발에 기여할 수 있을 것이다.

• Bulletin of the Korean Chemical Society
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• v.14 no.2
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• pp.183-187
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• 1993

Aryl carbenic anion radicals have been generated from the corresponding alkoxy-aryl diazo compounds by unimolecular decomposition reaction in various electrolyte/solvent systems. The electrochemical reductions of alkoxy-aryl diazo compounds in the electrolyte/solvent system are shown to initially be a one-electron process which affords the corresponding anion radicals. The unimolecular loss of nitrogen is favored at the propagation step and accelerated by the oxygen and carbon atoms of alkoxy group adjacent to the diazo function. The structure of the carbene anion radical in the termination is considered to be a resonance hybrid.

• Nonlinear Functional Analysis and Applications
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• v.27 no.1
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• pp.59-82
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• 2022

In this paper, we present a modified (improved) generalized M-iteration with the inertial technique for three quasi-nonexpansive multivalued mappings in a real Hilbert space. In addition, we obtain a weak convergence result under suitable conditions and the strong convergence result is achieved using the hybrid projection method with our modified generalized M-iteration. Finally, we apply our convergence results to certain optimization problem, and present some numerical experiments to show the efficiency and applicability of the proposed method in comparison with other improved iterative methods (modified SP-iterative scheme) in the literature. The results obtained in this paper extend, generalize and improve several results in this direction.