• 한국안전학회지
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• 제34권5호
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• pp.31-36
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• 2019

This study made a testing device to evaluate the distribution board management system. Power was supplied to the testing device using a loading-back method and the voltage applied to it was 440 V at the same turn ratio. When the human body electric shock current is 30 mA, the breaking time is set to be less than 240 ms while 30~45 mA current is flowing. The test result shows that in the case of the R-phase it was measured to be 5.19 Hz (193 ms). And the S-phase and T-phase were perfectly cut off at 5.39 Hz (186 ms) and 5.71 Hz (175 ms), respectively. When the human body electric shock current is 60mA, the breaking time is set to be less than 120 ms while 45~75 mA current is flowing. The test result shows that the R-phase, S-phase, and T-phase were accurately cut off at 8.39 Hz (11 ms), 8.87Hz (113 ms) and 9.69 Hz (103 ms), respectively. When the human body electric shock current is 90 mA, the breaking time is set to be less than 48 ms while 75 mA current is flowing. The test result shows that the R-phase, S-phase, and T-phase were accurately cut off at 19.8 Hz (50.4 ms), 16.9 Hz (59.2 ms), and 17.9 Hz (56.0 ms), respectively. That is, the developed testing device satisfied all the requirements of the distribution board evaluation criteria, and it becomes available for the performance evaluation of the distribution board management system.

• 유통과학연구
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• 제17권11호
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• pp.27-34
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• 2019

Purpose: This study explored the improvement and the direction of the smart disaster management system newly attempted in South Korea by analyzing the utilization of the existing system. This study focuses on making it easy to apply to user tasks and improving on site information. Research design, data and methodology: Problems were identified through field surveys with administrators in charge of administration and public institutions based on GIS based status board for NDMS which is widely used in Korea. Also, this study attempted to generalize to specialists in disaster management who are more likely to use the system in the future. Results: We derived improvement plans and verified the results through expert feedback. The results show that the GIS based status board for NDMS is cumbersome to use due to the vast array of unnecessary information compared to the high expected utilization. Conclusions: We found that improving the speed and accuracy of the smart disaster management information delivery system is necessary. Also, it is important to identify reasons for not improve the willingness to use this technology in disaster management and to figure out the process by which field personnel makes decisions that smart disaster information cannot be used for disaster management.

• 산업경영시스템학회지
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• 제29권1호
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• pp.63-71
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• 2006

In this paper, we consider a planning problem arising from printed circuit board manufacturing industries. Given a set of several types of PCBs, component feeders and surface mounting machines in series in a PCB assembly line, the problem is to define the feeder allocation and job sequence with the objective of minimizing the total operation time of the line. We formulate the problem as a mathematical model. And, the problem is proven to be NP-hard, so a genetic algorithm is developed. Finally, we give test results to evaluate the performance of the genetic algorithm.

• 한국항해항만학회지
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• 제31권8호
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• pp.645-652
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• 2007

이 논문에서는 현재 선박의 운항 기능을 보다 향상시키는 방법의 하나로서 경제적이고 효율적인 "선박종합정보시스템"을 개발하였다. 이것은 선박의 운항 정보 및 주변 상황을 한 눈에 정확히 파악할 수 있도록 데이터를 종합적이고 체계적으로 선내 통신망을 기반으로 통합하고, 선내 뿐 만아니라 위성데이터통신을 이용하여 원격으로 육상에서 실시간으로 다중의 사용자가 동시에 이를 감시, 기록, 분석을 통하여 선박운항을 지원할 수 있는 시스템이다. 선박종합정보시스템은 선박신호연동장치를 통해 수신된 항해/기관/경보 데이터를 선박종합통신망에 적절하게 전송하는 데이터 분배 프로그램, 항해/기관 데이터를 저장하고 관리하는 데이터베이스, 항해/기관/경보 데이터를 표시하여 선박의 운항 상황 및 주변 상황을 감시하는 각종 정보프로그램, 선박이 건조되어 폐선될 때까지의 관리에 관한 선박관리프로그램, 기타 응용 프로그램으로 구성되어 있다.

• 정보관리학회지
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• 제31권3호
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• pp.227-247
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• 2014

본 논문은 JASIST(Journal of the Association for Information Science and Technology)의 편집위원회 구성원들의 연구분야와 JASIST에 수록된 연구논문의 키워드에 연관성이 있는지에 대한 연구로서, 저자동시인용분석을 이용하여 JASIST 편집위원회 구성원들의 특성을 파악하였고 네트워크분석을 통해 저자동시인용네트워크에서 중심성이 높은 구성원들의 연구분야를 조사하여 2013년 한 해 동안 JASIST에 수록된 연구논문의 키워드와 비교하였다. 이를 통해 JASIST 편집위원회 구성원들 중 저자동시인용네트워크에서 중심성이 높은 구성원들은 주로 정보행태, 정보검색, 정보시스템과 계량정보학에 관련된 연구를 하는 것으로 나타났으며 이는 JASIST에 수록된 연구논문의 키워드에도 가장 많이 나타나는 분야인 것으로 조사되었다.

• The Journal of Asian Finance, Economics and Business
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• 제6권3호
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• pp.67-79
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• 2019

This study examines the impact of corporate governance on capital structure decisions based on a large panel of Chinese listed firms. Using the system Generalized Method of Moments (GMM) estimator to control for unobserved heterogeneity, endogeneity, and persistency in capital structure decisions, we document that the ownership structure plays a significant role in determining leverage ratios. More specially, we find that managerial ownership has a positive and significant impact on firms' leverage, consistent with the incentive alignment hypothesis. We also find that managerial ownership only affects the leverage decisions of private firms in the post-2005 split share reform period. State ownership negatively influence leverage decisions implying that SOEs may face fewer restrictions in equity issuance and may receive favourable treatments when applying for seasoned equity ¿nancing, thus use less debt. Furthermore, our results show that while foreign ownership negatively influences leverage decisions, legal person shareholding positively influences firms' leverage decisions only for state controlled firms. We also find that the board structure variables (board size and the proportion of independent directors) do not influence firms' capital structure decisions. Our findings suggest that recent ownership reforms have been successful in terms of providing incentive to managers through managerial shareholdings to take risky financial choices.

• The Journal of Asian Finance, Economics and Business
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• 제8권9호
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• pp.189-199
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• 2021

This study attempts to examine the relationship between corporate social responsibility (CSR) disclosure and earnings management practices in the context of Saudi Arabia after mandatory IFRS adoption. It is carried out on an unbalanced panel of 277 observations over the period 2017-2019. For this purpose, CSR disclosure is measured by Bloomberg ESG scores, while the residuals from the modified Jones model are considered for earnings management. As control variables, we have retained the firm performance, market-to-book ratio, firm size, financial leverage, board independence, ownership concentration, managerial ownership, and lagged discretionary accruals. Using the system GMM estimator in the dynamic panel, the results show a positive association between CSR disclosure and earnings management practices, thus supporting the perspective of agency theory. Managers engage in socially responsible activities beforehand to conceal their wrongdoing and convince stakeholders that the organization is transparent. They probably use ethical codes as a tool to achieve their own goals rather than the firm's goals. Our contribution is the use of recent data (2017-2019) taking into account the mandatory adoption of IFRS in Saudi Arabia. Additionally, to our knowledge, this study is the first to address CSR disclosure and earnings management practices using GMM system estimates.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 추계학술대회 논문집(제1권)
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• pp.15-22
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• 2006

현재 선박의 운항 기능을 보다 향상시키는 방법의 하나로서 선박의 운항 정보 및 주변 상황을 한 눈에 정확히 파악할 수 있도록 데이터를 종합적이고 체계적으로 선내 통신망을 기반으로 통합하여 선내 뿐 만아니라 위성데이터통신을 이용하여 원격으로 육상에서 실시간으로 다중의 사용자가 동시에 이를 감시, 기록, 분석을 통하여 안전한 선박운항을 지원할 수 있는 경제적이고 효율적인 '선박종합정보시스템'(Integrated System of Ship's Information)의 개발을 목표로 하고 있다.

• 한국멀티미디어학회논문지
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• 제23권9호
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• pp.1171-1180
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• 2020

The number of the PV systems installed in south korea has been gradually increasing. Interest of operation & management of PV System is rising up as PV System installation trends to increase. The vital function of operation & management is the monitoring system. Most monitoring systems are only available for equipment of suppliers and manufacturers. In this study, a monitoring system was implemented to support multi-domain equipment (inverter, junction box, water distribution board, environmental sensors) that are not limited to specific manufacturers. Monitoring system includes a visualization function, which makes it easy for users to check the power generation and the operation status of the equipment of PV System. In the future, this monitoring system will be utilized as an operation & maintenance foundation element in the PV system industry.

• 대한영양사협회학술지
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• 제7권1호
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• pp.105-116
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• 2001

This study was conducted a part of the project developing the standards of national board test for the dietitian's licence. The purpose of this study was to verify the dietitian's job description. To do this the survey was carried out for the frequency, criticality and difficulty of each job description with 4 point scales. The subjects was 521 dietitians, who have been working over 3 years at their position. The results are following ; 1. The each duty, task and task elements are verified with survey results. 2. Duties with high frequency and criticality were menu management, purchasing, storage and stock management, operational management for cooking, system management for distribution and sanitation management. 3. Duties with middle frequency and high criticality were managing equipment and facility, food service management, human resources management and self-development. 4. Duties with low frequency and high criticality were nutritional assessment for life cycles, nutrition therapy, nutrition education and disease management. 5. For difficulty, food service area show lower than of nutrition service area.