• 한국군사과학기술학회지
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• 제26권3호
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• pp.234-245
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• 2023

The Arena Fragmentation Test(AFT) is designed to analyze warhead performance by measuring fragmentation data. In order to evaluate the results of the AFT, a set of AFT images are captured by high-speed cameras. To detect objects in the AFT image set, ResNet-50 based Faster R-CNN is used as a detection model. However, because of the low resolution of the AFT image set, a detection model has shown low performance. To enhance the performance of the detection model, Super-resolution(SR) methods are used to increase the AFT image set resolution. To this end, The Bicubic method and three SR models: ZSSR, EDSR, and SwinIR are used. The use of SR images results in an increase in the performance of the detection model. While the increase in the number of pixels representing a fragment flame in the AFT images improves the Recall performance of the detection model, the number of pixels representing noise also increases, leading to a slight decreases in Precision performance. Consequently, the F1 score is increased by up to 9 %, demonstrating the effectiveness of SR in enhancing the performance of the detection model.

• 한국해양공학회지
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• 제16권5호
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• pp.34-40
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• 2002

A numerical model has been developed for the permeable coastal structures to simulate hydraulic characteristics on the permeable slopes, which interact with internal four field the structures. The model includes hydraulics in the porous medium. Numerical model was calibrated using hydraulic model experiments performed in 2-D wave flume in the Institute of Ocean Hydraulics in PKNU. Better aggrements were obtained with the model which employed inertia resistance term than with the conventional model, PBREAK.

• 산업경영시스템학회지
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• 제4권4호
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• pp.63-69
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• 1981

As enterprises are getting bigger and bigger and more competecious, an engineering economy for the maximization of profit based on basic theory must be considered. This thesis present dynamic computer model for the decision which controls complicated and various man- machine system optimally. This model occur in general stage can be adaptable to every kind of enterprises. So, any one who has no expert knowledge is able to get the optimal solution. And decision tree used in this paper can be applied in every kinds of academic circles as well as whole the industrial world. This paper studied optimal management of engineering project based upon basic theory of engineering economy. It introduces and functionizes the variables which generalize every possible elements, set up a model in order to find out the variable which maximize the calculated value among many other variables. And the selected values ate used as decision- marking variables for the optimal management of engineering projects. It found out some problem of this model. They are : 1. In some kinds of man-machine system it refers to Probability, but other case, it depends on only experimental probability. 2. Unless decision making process (decision tree) goes on, this model can not be applied. So these cases, this paper says, can be solved by adapting finite decision tree which is analyzed by using the same technic as those in product introduction problem. And this paper set up the computer model in order to control every procedure quickly and optimally, using Fortran IV.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2003년도 춘계학술대회
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• pp.214-225
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• 2003

Now a day, the company must strengthen the contact-point of the customer who the company has and has to block the secession of the customer by providing services or goods on time. Under this market situation, the corporation extends the CRM for the customer management and strategic management, and set the CRM-strategies up for managing the customer relationship. For this, the present enterprise's level and the business-ability for the management of the customer relationship should be considered. Therefore, in this study, we will analyze the critical factors to set the CRM up as a strategy by studying the literature review. In the critical factors, the factors of enterprise level as well as the technical factor will be included. Secondly, as you know, the BSC is used to evaluate the corporation as a index. In this study the BSC model is changed and rearranged for the applied BSC model to measure the C3M level of companies. Thirdly, based on the model developed, the factors in the first step are classified by levels and weighted values are calculated by using AHP method. As a result, we will show the diagnostic model for check the operational performance of management, marketing and sales etc.

• 해양환경안전학회지
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• 제21권5호
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• pp.591-598
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• 2015

본 연구에서는 태풍 나크리에 의한 해운대 해수욕장의 쇄파대 수리특성을 SWASH 모형을 이용하여 분석하였다. 국립해양조사원에서 제공하는 파랑관측자료를 바탕으로 태풍 나크리 내습 시의 대표파를 선정하였다. 수치모형에서 입사파는 JONSWAP Spectrum에 의한 불규칙파로 선정하였다. SWASH 모형에 의해 산정된 해빈류 패턴은 현지관측자료와 비교하였으며 수치모형에서 산정된 최대소상고는 비디오 모니터링 자료 및 경험식과 비교하였다. 최대소상고의 위치는 비디오 모니터링 자료에 나타난 파흔을 이용하여 유추하였으며 태풍 NAKRI(1412) 내습 시 S 계열의 파랑이 지배적으로 작용하였으며 동백섬측에서 미포측으로 연안류가, 해운대 해수욕장 중앙부근에서 이안류가 발생하였다. SWASH 모형을 이용하여 산정한 최대소상고(1.15 m)는 비디오 모니터링 자료(1.26 m)와 유사한 경향성을 나타냈으며 Stockdon et al.에 의해 제시된 경험식(1.33m)과 비교적 유사하게 나타났다.

• 산업진흥연구
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• 제2권2호
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• pp.45-52
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• 2017

본 연구는 현 품질명장들의 설문조사 분석과 독일의 마이스터제도, 일본 명공제도, 기능명장, 품질명장제도 고찰을 통하여 제도상 문제점을 도출하여, 품질명장제도 개선모형을 설정하였다. 첫째는 품질명장 선발분류 가이드 모형 설정하였으며, 둘째는 경험과 전문 기술이 이론과 접목을 위한 모형을 설정하였고, 셋째는 중소기업 경쟁력강화를 위한 품질명장 활용모형을 설정하였으며, 넷째는 향후 품질명장 되기 위한 기본적 모델을 제시하였다. 이러한 모델이 기대되는 효과로는 지식기반의 경제에서, 우수한 인재를 발굴과 육성 활용측면에서 품질명장은 각 분야에서 학문적 이론과 경험을 접목하여, 핵심적 전문기술과 지식, 최고의 기능 우수한 관리능력 및 참다운 인성보유자로 변혁적인 리더이자 전문가로써, 성과 창출로 기업경쟁력 향상과 후배 지도육성, 그리고 협력업체 지도로 혁신활동의 선봉장이 될 것이며, 중소기업 경쟁력강화를 위해서는 품질명장 정년퇴직 이후에도 제도적 보완으로 인재가 활용되어 중소기업의 기술축척과 배양이 가능 하리라 본다.

• 한국컴퓨터정보학회논문지
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• 제7권3호
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• pp.60-67
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• 2002

정보화 시대의 역기능으로서 존재하는 정보시스템에 대한 보안 위협은 날로 증가하고 있으며 이에 대한 체계적인 보안관리가 중요시되고 있다. 보안관리에 있어서 가장 중요한 것은 위협의 근원을 파악하여 대책을 수립하기 위한 위험분석이다. 따라서 제안모델은 보안성향상을 위하여 보안정책수립을 조언하도록 하고 경제적인 보안대응책 수립을 위하여 위험산출단계에 대하여 신뢰성을 향상 시켰다. 특히 대응책 단계에서 자산에 대하여 보안등급을 부여하여 자산간의 상호의존도를 검사하게 하고, 제시된 대응책의 구현은 표준모델과 다르게 제안모델에서는 자산별 제약사항을 식별하도록 하여 불필요한 대응책을 구현하지 않도록 하여 경제적인 대응책의 구현이 이루어질 수 있도록 모델을 개선하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1868-1873
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• 2011

In this paper, a theoretical formulation of a simplified wheel-set model for collision-induced derailments was evaluated by numerical simulations for the wheel-climb derailment and wheel-lift derailment types. The derailment types were classified into the wheel-climb derailment and the wheel-lift derailment according to the friction force direction of the wheel-flange. The wheel-climb derailment type was classified into Climb-up, Climb/Roll-over, and Roll-over-C, and wheel-lift derailment type was classified into Slip-up, Slip/Roll-over and Roll-over-L. To verify the theoretical equations derived for the wheel-climb derailment and the wheel-lift derailment, dynamic simulations using RecurDyn of Functionbay and Ls-Dyna of LSTC were performed and compared for some examples. The derailment predictions of the suggested theoretical formulation were in good agreement with those of the numerical simulations. The direction of the frictional force between the wheel-flange and the rail can be well predicted using the suggested derailment formulation at a initial derailment.

• 대한치과의사협회지
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• 제52권1호
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• pp.17-26
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• 2014

Computerized 3D virtual dental models are currently available, and their use has started to improve treatment outcomes. The accuracy of digital models has been demonstrated by many studies and various intra-oral scanners are innovated for short scanning time and high precision. Recently, a digital model was combined with a high technology computer-driven system, which was developed for the application of a digital set-up and indirect bonding of lingual attachments. In this section, virtual treatment planning using a virtual set-up program is be introduced, and the clinical applications and accuracy of computer-generated indirect bonding are discussed.

• 대한기계학회논문집A
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• 제22권1호
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• pp.90-101
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• 1998

This paper presents a scheduling method that uses Petri net modeling and heuristic search to handle the tool setup. In manufacturing systems, a tool is attached to a particular machine to process a particular operation. The activity to attach a tool to a particular machine and detach the tool from the machine requires time. The processing time of operations varies according to the attached tool and the machine used. The method proposed in this paper uses Petri net to model these characteristics and applies a search algorithm to the reachability graph of the Petri net model to generate an optimal or near-optimal schedule. New heuristic functions are developed for efficient search. The experimental results that show the effectiveness of the proposed method are presented.