• 시스템엔지니어링학술지
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• 제8권1호
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• pp.1-7
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• 2012

This research aims to propose a model to estimate the appropriate SE Cost rate to the total project cost when systems engineering applied to light rail transit project. In this research an investment cost estimation model is proposed with reference to COSYSMO (Constructive System Engineering Cost Model). This model includes four input factors such as requirement numbers, interface numbers, algorithm numbers, and scenario numbers. When 2600 requirement numbers are considered on a proposal document with 350 pages in a light rail transit specification of 500 billion~trillion won scale, COSYSMO demo version estimates 42.5 billion won of SE cost (about 5% of total project cost or about 10% of E&M cost).

• 논리연구
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• 제14권3호
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• pp.137-176
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• 2011

밥 헤일은 최근 추상화 원리에 기초한 실수이론을 제안하였다. 그 이론에서 실수는 양의 비율로 간주되고, 양의 비율의 동일성은 유독소스에게서 유래된 비율 원리에 의해 설명된다. 그가 실수를 양의 비율로 정의하는 이유는 산수 개념의 정의는 그런 개념의 보편적 적용 가능성에 알맞게 이루어져야 한다는 프레게의 요구를 그가 만족시키려 하기 때문이다. 이 글에서 나는 실수적용에 대한 헤일의 설명이 왜 프레게 제한을 만족시키기 힘든지 보이고, 대안이 될 만한 설명을 제안한다. 나는 먼저 양 개념에 대한 그의 설명과 양의 영역에 관한 그의 약정 사이에 어떤 간격이 있고, 이 때문에 실수 적용에 대한 그의 설명에 어려움이 생긴다는 것을 보인다. 다음으로 나는 어떤 종류의 양들에나 적용될 수 있는 새로운 비율 원리를 제안하고, 그 원리는 양의 비율로서 실수들이 보편적으로 적용가능한 이유를 적합하게 설명해 준다고 주장한다. 마지막으로 나는 양의 측정 절차를 검토한 후, 실수의 성공적 적용을 위해 우리가 전제해야 할 원리들을 제시한다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제9권4호
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• pp.216-224
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• 2009

The endless scaling down of the semiconductor process made the impact of the power network noise on the performance of the state-of-the-art chip a serious design problem. This paper compares the performances of two popular circuit reduction approaches used to improve the efficiency of power network noise analysis: moment matching-based model order reduction (MOR) and node elimination-based MOR. As the benchmarks, we chose PRIMA and R2Power as the matching-based MOR and the node elimination-based MOR. Experimental results indicate that the accuracy, efficiency, and memory requirement of both methods very strongly depend on the structure of the given circuit, i.e., numbers of the nodes and sources, and the number of moments to preserve for PRIMA. PRIMA has higher accuracy in general, while the error of R2Power is also in the acceptable range. On the other hand, PRIMA has the higher efficiency than R2Power, only when the numbers of nodes and sources are small enough. Otherwise, R2Power clearly outperforms PRIMA in efficiency. In the memory requirement, the memory size of PRIMA increases very quickly as the numbers of nodes, sources, and preserved moments increase.

• 시스템엔지니어링학술지
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• 제10권1호
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• pp.57-64
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• 2014

We propose a methodology to automatically extract the requirements from the documents and check the traceability between them. The documents include not only the text file but also PDF or image files. We also suggest a method to visualize the result with maps, numbers, and graphs. By comparing the results with those of expert reviews, we show that it is necessary to use knowledge-based method in future instead of the word-based method for improving the reliability. The results give more values when they are applied in already existing documents than those of newly developed product.

• 한국도서관정보학회지
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• 제33권4호
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• pp.149-177
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• 2002

URIs는 정보 접근의 신뢰성을 확보하기 위한 식별체계로서, 본 연구에서는 기존의 식별체계인 ISBN, ISSN, NBN을 URN으로 이용하여 URN 시스템을 설계하였다. 이를 위해서 URN의 기능적 요구사항, 부호화 요구사항, 구조적 측면을 바탕으로 서지식별기호들의 URN 사용 가능성을 분석하였다. 분석결과 ISBN, ISSN, NBN은 URN으로서 사용 가능성이 확인되었고. 이 결과를 바탕으로 RDS를 기반으로 한 서지식별 체계의 URN 변환 시스템을 각각 설계하였다.

• 한국주거학회논문집
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• 제19권5호
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• pp.19-27
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• 2008

The purpose of this study was to suggest optimum guidelines apartment rooms by conducing survey among residence whose apartment floor size is between $66-198m^2$ and whose apartment is less than 3 years old. The effective numbers of survey questionnaire turned in was 226 and the survey analysis has been made by using of SPSS WIN 12.0. The results and conclusion of the studies are as follows; (1) $66{\sim}98m^2$ : The recommended numbers of bedroom is 2 and 3. The size of maser bedroom needs to be decreased whereas the size of living room be increased. (2) $99-131m^2$: The recommended numbers of bedroom is 3 and 4. The size of maser bedroom and maser bathroom needs to be decreased whereas the size of living room, 2nd bedroom, kitchen and dining room needs to be increased. (3) $132-164m^2$: The recommended numbers of bedroom is 3 and 4. The size of maser bedroom and bathroom needs to be decreased whereas the size of dress room, kitchen and dining room, and 2nd bedroom needs to be increased. (4) $165-197m^2$: The recommended numbers of bedroom is 3 and 4. The size of maser bedroom and maser bathroom needs to be decreased and the size of dressroom and kitchen /dinning room needs to be increased. (5) $198m^2$ and above: the recommended numbers of bedroom is 3,4 and 5. The size of dressroom needs to be increased. It is revealed that the number of bedroom doesn't need to be increased as the size of apartment is increased. Larger space is required for the public space for the family and dressroom. And smaller space is required for the maser bedroom and master bathroom.

• Journal of information and communication convergence engineering
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• 제9권6호
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• pp.775-779
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• 2011

As the technology of multimedia sensor networks is desired in large numbers of applications nowadays, real-time service becomes one of the most important research challenges. Even though lots of related works have been conducted to meet this requirement in several ways, the specific traffic model for real-time has not been taken yet. Thus, it causes lack of adaptability of those approaches in real deployment. To solve this problem, in this paper, we model the application via (m,k)-firm streams which have weakly hard real-time property. And then, a novel forwarding scheme based on modified DBP (Distance-Based Priority) is proposed by considering local-DBP and stream DBP together. Local-DBP can contribute to identify the detailed causes of unsatisfied quality, that is, network congestion or wireless link failure. Simulation results reveal that (m,k)-firm is a good traffic model for multimedia sensor networks and the proposed scheme can contribute to guarantee real-time requirement well.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권5호
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• pp.2468-2483
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• 2017

The construction of completely random sensing matrices of Compressive Sensing requires a large number of random numbers while that of deterministic sensing operators often needs complex mathematical operations. Thus both of them have difficulty in acquiring large signals efficiently. This paper focuses on the enhancement of the practicability of the structurally random matrices and proposes a semi-deterministic sensing matrix called Partial Kronecker product of Identity and Hadamard (PKIH) matrix. The proposed matrix can be viewed as a sub matrix of a well-structured, sparse, and orthogonal matrix. Only the row index is selected at random and the positions of the entries of each row are determined by a deterministic sequence. Therefore, the PKIH significantly decreases the requirement of random numbers, which has a complex generating algorithm, in matrix construction and further reduces the complexity of sampling. Besides, in order to process large signals, the corresponding fast sampling algorithm is developed, which can be easily parallelized and realized in hardware. Simulation results illustrate that the proposed sensing matrix maintains almost the same performance but with at least 50% less random numbers comparing with the popular sampling matrices. Meanwhile, it saved roughly 15%-35% processing time in comparison to that of the SRM matrices.

• 대한산업공학회지
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• 제33권2호
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• pp.227-236
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• 2007

This paper proposes a method for designing stacking warehouses of pyramid type which can be found in storage rooms for steel coils, paper rolls, and drums for oils. Formulas were derived for estimating the expected travel time of cranes and the expected time for rehandling activities. Based on the derived formulas, this study derives the cost function for determining the optimal numbers of rows, bays, tiers of stacks under the condition that the requirement for storage space is satisfied. Numerical examples were given.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 추계학술대회논문집 - 한국공작기계학회
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• pp.309-313
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• 2000

In order to meet the industrial requirement, precision grinding with brush tool has been applied. To analyze the brush tool characteristics, several parameters including numbers of brush string installed in a single holder, depth of cut and brush length have been changed. Several data from various source were acquired using AE, acceleration and tool dynamometer during the process. Consistent results revealing certain trend with respect to each process condition were observed.