• 아태비즈니스연구
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• 제9권4호
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• pp.99-117
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• 2018

This study has investigated Linear Programming (LP) applications to special decision making problems in managerial accounting with the help of spreadsheet Solver tools. It uses scenario approaches to case examples having three products and three resources in make-and-supply business operations, which is applicable to cases having more variables and constraints. Integer Programmings (IP) are applied in order to model situations when products are better valued in integer values or logical constraints are required. Three cases in one-time-only special order decisions include Goal Programming approach, Knapsack problems with 0/1 selections, and fixed-charge 0/1 integer modelling techniques for set-up operation costs. For the decisions in outsourcing problems, opportunity-costs of resources expressed by shadow-prices are considered to determine their precise contributions. It has also shown that the improvement in work-shop operation for an unprofitable product must overcome its 'reduced cost' by the sum of direct manufacturing cost savings and its shadow-price contributions. This paper has demonstrated how various real situations of special decision problem in managerial accounting can be approached without mistakes by using LP's and IP's, and how students both in accounting and management science can acquire LP skills in their education.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.1063-1072
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• 1993

Current finite element analysis programs for soil cutting process with tillage tools require mainframe computers. Several special treatments in developing a microcomputer FEM program were introduced to increase the capacity for solving large problems and reducing the total time cost. The program was evaluated by solving one 3-D example on a 489 microcomputer. The results showed a close agreement with the laboratory soil bin test.

• Kyungpook Mathematical Journal
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• 제53권1호
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• pp.143-148
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• 2013

The theory of generalized Bessel functions is reformulated within the framework of an operational formalism using the multiplier representation of the Lie group $T_3$ as suggested by Miller. This point of view provides more efficient tools which allow the derivation of generating functions of generalized Bessel functions. A few special cases of interest are also discussed.

• 한국정밀공학회지
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• 제29권2호
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• pp.156-160
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• 2012

Recently, the demands of the large scale machine tools gradually increase to machine the large parts, such as large scale crankshaft, yaw and pitch bearings for the wind power generator and the vehicle or aircraft components. But the high technology is necessary in order to develop the huge machine tools. Furthermore, the global market of it has been monopolized by a few companies. So, we need to develop the large scale machine tools and study its core technology to rush into the increasing market. In this study, we carried out the researches for the important core technology of a multi-tasking, machine tool; a large scale 5-axis machine tool of gantry type for multi-task machining. This study is focused on the design of large size gantry type multi-axis machine. In the case of large size of machine the cross rail deflection in the X-axis is significant. To reduce the deflection due to the eccentric spindle head, a special hollow type design in the cross rail with outside ram is adapted in this study. Also, the Zig-Zag motion in the Y-axis is inevitable with the gantry geometry, which is by the un-balancing, different motion at the left and the right columns moving. We tried to reduce the influence of Zig-Zag motion using FEM with different loading conditions at the left and the right side column.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2007년도 추계 종합학술대회 논문집
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• pp.889-893
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• 2007

현재 다양한 연구에서는 유체인 안개의 자연스런 표현을 위해 프랙탈과 카오스 이론을 적용한다. 이러한 연구로 적용할 수 있는 전문 툴들을 사용하는 것은 자연스러운 표현이 가능하기 때문이다. 그러나, 일반인은 이러한 것을 아직 쉽게 표현하기는 매우 어려운데 그것은 고비용과 전문가들을 필요로 하기 때문이다. 따라서 누구나 어렵고 복잡한 고가의 전문툴들과 전문적으로 프로그래밍 제작을 최소로 한 안개의 표현을 쉽게 할수 있도록 하는 것이 일반적인 과제들이다. 본 연구는 이러한 2D 이미지에 대한 유체의 표현연구를 구체화하는 것으로 다양한 이미지 표현이 전문방송에서 개인에 이르는 UCC까지 가능하도록 쉽게 구현하였다. 특히, 이 연구는 3D 공간에서 안개의 유체적인 표현이 가능하기 때문에 한국화를 3D와 같이 표현할 때 배경에 안개의 표현을 쉽게 할 수 있도록 하였다.

• 정보처리학회논문지A
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• 제9A권2호
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• pp.249-258
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• 2002

처리기를 여러 개 장착한 다중처리기 시스템의 근본 목적은 적은 비용으로 많은 성능 향상을 얻자는 데에 있다. 그러나 다중처리기 시스템을 충분히 활용하기 위해서는 병렬처리를 지원하는 특별한 언어를 사용하거나 병렬성을 탐색하는 도구의 도움을 얻어야 하는 경우가 대부분이다. 일반적으로 알고리즘에서 병렬화에 적합한 대표적인 영역으로 루프와 재귀호출 등이 알려져 있다. 이 중 재귀호출은 특별한 도구나 언어의 지원 없이 개념적인 측면에서 비교적 쉽게 병렬화 시킬 수 있다. 그러나 재귀호출이 깊어지면 통제되지 않은 병렬성이 과도하게 높아져 오히려 수행불능 상태가 되고 만다. 본 논문은 POSIX스레드를 이용하여 재귀호출로 구성된 알고리즘을 병렬화시키는 과정에서 병렬성을 제어하는 방안을 제시한다. 이를 위하여 유닉스 시스템에서 프로세스와 스레드의 개념을 정립하고, 제안된 병렬성 제어 방안을 퀵 정렬에 적용한 결과를 실증적으로 분석하여 그 효용성을 검증한다.

• Safety and Health at Work
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• 제10권1호
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• pp.125-129
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• 2019

The ultimate goal of the quality control program for special periodic health examination agencies is to diagnose the health condition of a worker correctly, based on accurate examination and analysis skills, leading to protect the worker's health. The quality control program on three areas, chemical analysis for biological monitoring since 1995, and pneumoconiosis, audiometric testing since 1996, has contributed to improve the reliability of occupational health screenings by improving the issues including standardization of testing methods, tools, diagnostic opinions, and reliability of analysis for biological monitoring. It has contributed to improving the reliability of occupational health monitoring by rectifying the following issues associated with previous monitoring: absence of standardized testing methods, testing tools that are not upgraded, mismatching diagnostic opinions, and unreliable results of biological specimen analysis. Nevertheless, there are issues in need of further improvement such as lack of expertise or the use of inappropriate method for health examination, and passive and unwilling participation in the quality control. We suggested solutions to these problems for each area of quality control program. Above all, it is essential to provide active support for health examiners to develop their expertise, while encouraging all the health screening agencies, employers, and workers to develop the desire to improve the system and to maintain the relevance.

• 융합보안논문지
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• 제22권5호
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• pp.21-35
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• 2022

디지털 정보는 정보통신의 발달로 지속적으로 증가 및 다양화되는 추세이며, 이를 악용한 범죄 또한 증가하고 있다. 하지만, 국내의 디지털증거에 대한 처리 및 분석을 위한 환경 구축 사례는 미비한 실정이다. 조직마다 할당된 예산이 상이하고 고질적인 문제인 공간 확보의 어려움을 해소하지 못한 상태에서 구축된 디지털증거분석실은 초기 구성단계에서부터 참조할 수 있는 기준이 없다. 본 논문은 디지털증거분석실 구축 시에 필요한 사항을 도구·장비 중심으로 탐색적 연구를 진행하였다. 연구방법으로 디지털증거분석실 구축 경험 또는 디지털포렌식 분야 근무 경험이 풍부한 전문가 15명을 대상으로 포커스 그룹 인터뷰를 수행하였다. 그 결과 네트워크 구성, 분석관 컴퓨터, 개인 도구·장비, 이미징 장치, 전용 SW, 오픈소스 SW, 공용 도구·장비, 액세서리, 기타 고려사항의 9가지 영역에 대해 전문가들의 의견을 수렴하고 디지털증거분석실의 도구·장비 목록을 도출하였다. 나아가 디지털증거분석실 구축 발전방안으로 공간/도구·장비 목록표준화, 디지털포렌식 도구·장비 민간 지원·위탁 체계 수립, 미래 디지털증거분석실 인프라 구조를 제시하였다. 이는 향후 디지털포렌식 기능을 신설하고 디지털증거분석실을 구축하고자 하는 기관/조직이 도구·장비 및 인프라 설계 등에 기여할 것이다.

• 한국CDE학회논문집
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• 제2권1호
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• pp.60-67
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• 1997

CAD systems offer a variety of techniques for designing and rendering models of static 3D objects and even of mechanisms, but relatively few tools exist for interactively specifying arbitrary movements of rigid bodies through space. Such tools are essential, not only for artistic animation, but also, for planning and demonstrating assembly and disassembly procedure of manufactured products. A rigid body motion is a continuous mapping from the time domain to a set of positions. To relieve the designers from the burden of specifying this mapping in abstract mathematical terms, combinations of simple rigid motion primitives, such as linear translations or constant axis rotations, are often used. These simple motions are planar and thus ill-suited for approximating arbitrary motions in 3D-space. Instead, we propose the screw motion primitive, a special combination of linear translations and constant axis rotations, which has a simple geometric representation that can be automatically and unambiguously computed from the starting and ending positions of the moving body. Although, any two positions may be interpolated by an infinity of motions, we chose the screw motion for its relative generality and its computational advantages. The paper covers original algorithms for computing the screw motions from interpolated positions and envelopes of swept regions to predict collisions.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.814-819
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• 2003

Machine tool design concepts have evolved towards high efficiency, accurate precision. high structural integrity, and multi-functional systems. Like many other structures, machine tools are also composed of many parts. When these parts are assembled, many kinds of joints are used. In the finite element analysis of these assembled structures, most joints are commonly considered as rigid joints. But, to get the more accurate solution, we need to model these joints in a appropriate manner. In this study, rational dynamic modeling and analysis method for complex structures are studied with special attention to slide way joints. For modeling of slide way joints, a general modeling technique is used by influence coefficients method which is applied to the conversion of detailed finite element model to the equivalent reduced joint model. The theoretical part of this method is illustrated and the method is applied to the structure with slide way joint. In this method. the non-linearity of the contact surfaces is considered within a proper range and the boundary effect of the joint model can be eliminated. The proposed method was applied to finite element modal analysis of a clamp jointed cantilever beam and slide way joints of the vertical type lathe. The method can also be used to other kinds of joint modeling. The results of these analysis were compared with those of Yoshimura models and rigid joint models. which demonstrated the practical applicability of the proposed method.