• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2005년도 추계 학술대회논문집(수송기계편)
• /
• pp.208-211
• /
• 2005

This paper describes the development process of steering system for reduce idle vibration through the data level of frequency and sensitivity. High stiffness and light weight vehicle is a major target in the refinement of passenger cars to meet customers' contradictable requirements between NVH performance and fuel economy. The target frequency of the steering system is set by benchmarking of a competitive vehicle and the vibration mode map is used to separate steering column modes from resonance of body structure and engine idle rpm. This paper descirbes the analysis approach process for high stiffness of steering system and the design guideline is suggested about steering column and support system by using mother car at initial design stage. We used a patent map in order to analyze accurately a technical trend and suggested the design process using dynamic damper of steering system considering sensitivity. And we established techniques of analysis on steering system and evaluated the level of accuracy of analysis through correlating the test and analysis results. It makes possible to design the good NVH performance vehicle at initial design stage and save vehicles to be used in tests. These improvements can lead to shortening the time needed to develop better vehicles.

• International Journal of Advanced Culture Technology
• /
• 제9권3호
• /
• pp.81-85
• /
• 2021

The purpose of this paper is to measure the relative efficiency of the police agencies in Korea with data collected from 2018 to 2020, using data envelopment analysis (DEA), as put forward by Charnes et al., which is used to construct a scalar measure of efficiency for all police agencies. The results of this study can be used to assist police agencies in delivering better and more efficient services to the community. The analytical results based on DEA identify potentially weak and strong police agencies on policing performance, their efficient benchmarking, and the levels of clear-ups that would make inefficient police agencies efficient. We could suggest that higher levels of the police force are associated with higher performance efficiency against crimes. But, it is a little hard to say that higher levels of the police force can keep the local police agencies efficient without explaining the contribution of other input variables to criminal arrest and prevention. On the other hand, our analysis presents that differences in operating environments and socioeconomic factors do not have a significant influence on the efficiency of local police agencies. But, it is necessary to note that we need to examine the effect of environments and socioeconomic factors on crime to create the better-policing performance.

• Structural Engineering and Mechanics
• /
• 제83권2호
• /
• pp.167-178
• /
• 2022

Surrogate models aim to approximate the performance function with an active-learning design of experiments (DoE) to obtain a sufficiently accurate prediction of the performance function's sign for an inexpensive computational demand in reliability analysis. Nevertheless, many existing active-learning methods are limited to the Kriging model, while the uncertainties of the Kriging itself affect the reliability analysis results. Moreover, the existing general active-learning methods may not achieve a fully satisfactory balance between accuracy and efficiency. Therefore, a novel active-learning method GLM-CM is constructed to yield the issues, which conciliates several merits of existing methods. To demonstrate the performance of the proposed method, four examples, concerning both mathematical and engineering problems, were selected. By benchmarking obtained results with literature findings, various surrogate models combined with the proposed method not only provide an accurate reliability evaluation while highly alleviating the computational burden, but also provides a satisfactory balance between accuracy and efficiency compared to the other reliability methods.

• 한국신뢰성학회지:신뢰성응용연구
• /
• 제14권3호
• /
• pp.152-161
• /
• 2014

According to Korea Federation of Small and Medium Enterprises (SMEs)' report, SMEs account for 99% and number of SMEs workers account for 87% in Korea. Thus, SMEs has an important role in the future Korean industry. This paper considers the improvement methods of SMEs' quality competitiveness. For this study, we developed the quality measurement model for identifying SMEs' quality level and investigated many companies by survey and interviews. We also performed the benchmarking study and the gap analysis between Korea and other countries. This paper suggests some policies for increasing the quality of SMEs.

• 품질경영학회지
• /
• 제26권4호
• /
• pp.166-188
• /
• 1998

The following study has been undertaken to build a model for evaluating the level of quality competitiveness of Korean companies in the area of information management. The objective of this paper is to compare the difference in quality-based competitiveness between the 100 advanced companies and other companies in IT management. This empirical study provides the questionnaire and the rating criteria for evaluation, so that any Korean company can easily evaluate their competitiveness. The model, the criteria and the results of this study can be used as a basis for benchmarking. The result indicates that the 100 advanced companies' quality competitiveness is significantly higher than that of most other companies that were surveyed in this study.

• 품질경영학회지
• /
• 제31권2호
• /
• pp.17-39
• /
• 2003

The 21st century is called “an era of creation” or “an era of speed.” These are flat expressions requiring a fierce competition between individuals, corporations and nations. In a reality in which we should make new things continuously within a short period of time, the world best benchmarking can become a good alternative. The world best practice can be called “a mode of operation” that has created the world's best performance in a particular field of managerial activities. It is very meaningful for the nations' corporations, which have a lower competitiveness than world-class ones and weak points in the area of human resources development, in particular, to benchmark the world-class corporations' best practices of HRD. Therefore, this study is conducted in conformity with a model of the Instructional Systems Designs for the Total Quality Education that brings the structure of the world-class corporations' best practices of HRD into line with that of the Total Quality Management. That is, analysis, design, development, implementation and assessment are included in this study.

• 지식경영연구
• /
• 제15권2호
• /
• pp.147-164
• /
• 2014

This paper investigated the efficiency of automobile firms by using several non-parametric approaches. First, using Data Envelopment Analysis (DEA), the paper has investigated the critical factors that determine the relative efficiency of management performance in automobile companies. Second, we examined how the firm size impact on the difference of this efficiency by using Kruskl-Wallis Test. Third, by using Mann-whitney test, we also investigated the difference of the efficiency accoss existence of technological innovation activity. Finally, the paper explored the relationship between technological innovation and management efficiency by using logistic regression model. The findings of this study provided practical information for inefficient automobile firms to find benchmarking firms and strategic position to improve their efficiency. The result also provided theoretical and methodological implications for those who explore factors affecting management efficiencies. Future research directions with the limitation of the study are discussed.

• 통상정보연구
• /
• 제11권2호
• /
• pp.127-145
• /
• 2009

With increase in oil demand owing to economic growth in Northeast Asia, the establishment of an oil hub in Korea is recently considered by policy and academic circles. This paper aims to suggest strategic schemes on the establishment of Korea's oil hub in Northeast Asia by comparing Korea's conditions as an oil logistics hub with Singapore which has been an oil hub in East Asia until recent year. Quantitative and qualitative analysis methods were employed in order to examine the competitiveness of Korea's oil hub. This research concludes that Korea is very competitive as an oil logistics hub in Northeast Asia, but so much improvements for realizing the project are necessary such as expansion of storage facilities for oil, institutional instruments for facilitating oil logistics and trading and preparation for incentive schemes on foreign investments in oil and its related industries.

• 대한기계학회논문집B
• /
• 제27권5호
• /
• pp.620-627
• /
• 2003

Radiative heat transfer in an axisymmetric enclosure with absorbing, emitting, and scattering medium is studied here by using the different methods such as MDOM, FVM, and FVM2 with emphasis on the treatment of angular derivative term, which appears in a curvilinear coordinates due to angular redistribution. After final discretization equation for FVM2 is introduced by using the step scheme and directional weights, present approach is validated by applying it to three different benchmarking problems with absorbing, emitting, and scattering medium.

• Bulletin of the Korean Chemical Society
• /
• 제32권12호
• /
• pp.4195-4198
• /
• 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.