• 한국지역사회생활과학회지
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• 제14권3호
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• pp.3-11
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• 2003

The objectives of the study were to analyze the current conditions of the“NONGCHON ILGAM GATCI”project (an income generating project for rural areas) and to suggest possible improvements. Among the 567 business which have been supported by the project, implemented in 1990 by the Department of Rural-Home-Improvement of the Rural Development Administration, 361 (63.7%) can be categorized as being in the self-supporting stage. Another 126 (22.2%) can be said to be in the incubation stage. Data for the case study was collected from 20 project sites. The“NONGCHON ILGAM GATCI”project has been progressing successfully when compared with other rural development projects. However, there are still some problems. Among the problems are the lack of a business mindset and management abilities in individuals, and the fact that the businesses and their products are not well hewn on the market. To remedy these problems, education toward improving business and management skills, a unified public relations system, and institutional support from the government are greatly needed.

• 한국통신학회논문지
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• 제21권3호
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• pp.587-599
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• 1996

In general fractal imge compression, each range block is approximated by a contractive transform of the matching domain block under the mean squared error criterion. In this paper, a distortion measure reflecting the properties of human visual system is defined and applied to a fractal image compression. the perceptual distortion measure is obtained by multiplying the mean square error and the noise sensitivity modeled by using the background brightness and spatial masking. In order to compare the performance of the mean squared error and perceptual distortion measure, a simulation is carried out by using the 512*512 Lena and papper gray image. Compared to the results, 6%-10% compression ratio improvements under improvements under the same image quality are achieved in the perceptual distortion measure.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.290-295
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• 2004

In railway system, the first step of safety managements is the identification of current safety level. Among many safety indexes, risk concept is the prevailing and most effective one in many developed countries for the safety management. But many requirements such as, accident classification rule, risk levels or broadly acceptable regions, safety cost benefit analysis, VPF, equivalent fatality and failure database are needed for the application of risk concept in railway. Basic requirements for the application of risk concept on railway safety improvements are derived in this study.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.170-175
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• 2005

In this study, experimental and theoretical methods were applied to understand brake squeal noise VVVF rolling stock on tracks. Trailer cars needed to payed a particular attention, because they were the major source of brake noise. VVVF rolling stocks for lines no 1 of the subway system in Seoul were used for experimental analyses. In order to study brake squeal noise, a dynamometer test at the S&T Brake, Co., which was a manufacturer of brake pads had performed. For measuring vibration and noise, vibration tests of brake parts (brake lining, brake lining head, back plates, etc.) at the SNUT were executed. Also, vibration tests of disc assembly and lining block at the heavy maintenance shop of the Gunja depot were performed. The modal analyses by using an ANSYS which was one of the CAE commercial program were simulated to know the relationship to the mechanism of brake noise. On the based of the tests and the simulations it was found that specific frequencies of the brake parts affected squeal noise, and improvements for reducing squeal noise were proposed.

• 산업경영시스템학회지
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• 제32권4호
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• pp.79-86
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• 2009

The purpose of this paper is to analyze the 24 mail center's efficiency and productivity changes from first quarter to fourth quarter of 2008 using window analysis and Malmquist productivity index. Row views of window analysis results make it possible to determine trends and/or observed behavior with the same data set, and column views to examine the stability of results across different data sets. Malmquist productivity indexes greater than unity translate into improvements in productivity, and less than unity mean deterioration in performance over time. The results of this study suggest that DEA models under dynamic situations such as window analysis and Malmquist productivity index enable us to comprehend the efficiency and productivity changes over time and to show the direction of improvements.

• 교육시설 논문지
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• 제27권5호
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• pp.24-31
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• 2020

This study proposed an effective improvement direction for the education and welfare supporting facilities and equipment sectors to guarantee the right of disabled students to study in university. To derive high-demand items, the value engineering quality model technique was conducted on the students who majoring in architecture and the disabled students. The high-demand items for the education and welfare supporting facilities and equipment was detailed by interviews with the disabled students. Especially, anti-skid floor material, spacious access space for electric wheelchair, efficient operation system for elevator and cafeteria waiting time are strongly demanded for the disabled students. Based on this research, universities can make efficient investments and improvements in the education and welfare supporting facilities and equipment sectors for disabled students.

• Journal of Electrical Engineering and Technology
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• 제13권1호
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• pp.192-200
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• 2018

In this study, improvements for error correction, speed, position, and rotation calculation algorithms have been proposed to be used in resolver to digital conversion (RDC) systems. The proposed open-loop system drives the resolver and uses the output signals of the resolver signal to estimate the real time position, the instant speed, and the rotation count with high resolution and accuracy even at high speeds and noise. The proposed solution implements strong features of both closed and open loop based systems while eliminating their weak points. The improvements proposed is resistant to noise owing to digital FIR filter and data averaging techniques. The implementation used for proof of concept is implemented on a hardware using an FPGA and configurable to be used by any resolver.

• 대한안전경영과학회지
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• 제19권4호
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• pp.209-219
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• 2017

Logistics companies want to be competitive companies in fierce logistics market and are worrying about securing of differentiated competitiveness for it. The standards judging if logistics industry maintains the competitiveness are based on the satisfaction of users due to the well-established service system that can response not only economic feasibility of logistics costs such as transportation costs, storage costs, unloading charges, information costs, etc. but also diversity and upgradability of logistics needs. Therefore, this study focuses on seeking of service quality improvements with VBSD(Value Based Service Design) model focusing on customer value factors based on Kano model and QFD based service design approach from angles of customer value improvement and service costs reduction.

• 한국해양환경ㆍ에너지학회지
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• 제16권2호
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• pp.121-129
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• 2013

본 연구는 해역이용협의제도의 실효성 확보를 위하여 해양 개발사업의 사후환경관리에 대한 문제점을 파악하고 개선 방안을 제시하였다. 협의내용 이행 및 점검 소홀, 사후관리조치 및 결과보고 미흡, 사후관리 인식저하 및 전문성 부족 등으로 개발사업의 사후관리가 제대로 이루어지지 않고 있으며, 또한 사후 해양환경영향조사의 경우도 사업전후 결과의 검증이 매우 중요한 사항인데도 형식적으로 추진되는 등 사후환경관리에 많은 문제가 나타나고 있다. 따라서 해역 이용협의제도의 실효성을 확보하기 위한 사후환경관리 개선방안으로 관계자들의 사후관리 인식제고 및 이행력 확보가 절실히 요구되며, 갈등해소를 위한 사후관리시스템 구축, 협의내용 미 이행 사항에 대한 제재 및 책임성을 강화해야 하고, 아울러 체계적인 사후 해양환경영향조사 모니터링방안이 정립되어야 할 것이다.

• 한국산업보건학회지
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• 제32권2호
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• pp.172-181
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• 2022

Objectives: In order to reduce the burden on employers and increase the reliability of measurement results, improvements to the provisions related to the work environment measurement reporting system, such as the current Occupational Safety and Health Act and its Enforcement Rules, are planned. This study aimed to suggest improvements for the work environment measurement reporting system through a survey and Delphi investigation. Method: This survey included workplaces (health managers), national institutions (the Ministry of Employment and Labor) that use the results of the work environment measurement reporting system for policy and supervision purposes, and work environment measurement institutions that enter the results were included. In addition to the survey, we tried to derive results through meetings with stakeholders and expert advisory meetings. Results: It is difficult to abolish or partially improve the reporting system under the Enforcement Regulations of the Occupational Safety and Health Act at this point because the opinions of workplaces, supervisory agencies, and measuring agencies differ in terms of its intended purpose and use. In the case of high-exposure harmful factors (over 50% on the basis of exposure) in the "comprehensive opinion" described in the work environment measurement results table, it is necessary to insert unit of work with exposed harmful factors, exposure factors, and current conditions in checklists or tables so that they can be reflected in government policies. In the case of workplaces that are feared to be highly exposed to substances subject to measurement, it seems desirable to improve them so that industrial health instructors registered with the Korea Safety and Health Agency or local labor offices can provide technical guidance. As an improvement plan to increase the reliability of data and the use of big data, it is necessary to improve the input method for processes and jobs. Conclusion: The laws and regulations of the work environment measurement reporting system are difficult to revise due to a lack of consensus among current stakeholders, but improvements can be achieved by improving the Ministry of Employment and Labor's notifications and other means. In addition, in order to effectively utilize the data from the K2B system, it is necessary to improve the input method for processes and jobs.