• Journal of ILASS-Korea
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• v.28 no.4
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• pp.191-197
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• 2023

LPG direct injection (LPDi) technology is a method of improving the weaknesses of existing LPG vehicles by directly injection into the combustion chamber. This study was conducted on the comparison of emissions and fuel efficiency performance of the engine and vehicle by applying LPDi technology. The LPDi hybrid engine's maximum output and maximum torque were measured at an equivalent level of less than 1% compared to conventional gasoline fuel. The fuel amount was corrected using the LCU controller, and the THC, CO, and NOx emissions were reduced to 90% in the operating range of the three-way catalyst through air-fuel ratio control. The analysis of THC+NOx and CO emissions in FTP-75 (CVS-75) driving mode satisfied the US LEV III SULEV30 regulation.

• Nuclear Engineering and Technology
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• v.56 no.4
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• pp.1339-1346
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• 2024

Electrorefining in molten salts is used for purifying actinides. Optimizing electrorefining is key to minimizing processing time and radiological waste. One possible way of improving electrorefining efficiency is using an AC superimposed DC waveform. This waveform has demonstrated potential benefits in aqueous solutions but has never been utilized in a molten metal, molten salt application. This work investigates the effects of using an AC superimposed DC waveform on molten bismuth electrorefining in a molten LiCl-KCl-CaCl2 eutectic. Bismuth has been identified as a potential surrogate for plutonium electrorefining and a potential cathode in electrorefining used nuclear fuel (UNF). All electrorefining runs resulted in a high purity cathode ring and high yield with exception of the run using a low-frequency, high-amplitude superimposed AC waveform, which experienced some contamination and a lower yield. The other three AC superimposed DC runs experienced an average yield 6.7 % higher than the average yield of the DC runs. The electrorefining run using the high-frequency, high-amplitude superimposed AC signal had the highest yield. It is recommended in future studies to investigate the statistical variability of electrorefining yield and current efficiency and the impact of AC superimposed DC waveforms on solidified bismuth anodes.

• Journal of Korean Society of Water and Wastewater
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• v.38 no.2
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• pp.109-117
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• 2024

In this study, various pre-treatment methods were evaluated for microalgae separation. These methods aimed to facilitate safe, rapid, and cost-effective online imaging for real-time observation and cell counting. As pre-treatment techniques, heating, chemical hydrolysis, heating combined with chemical hydrolysis, and sonication were employed. The effectiveness of these methods was evaluated in the context of online imaging quality through experimentation on cultivated microalgae (Chlorella vulgaris and Scenedesmus quadricauda). The chemical treatment method was found to be inappropriate for improving image acquisition. The heating pre-treatment method exhibited a drawback of prolonged cell dispersion time. Additionally, the heating combined with chemical hydrolysis method was confirmed to have the lowest dispersion effect for Chlorella vulgaris. Conversely, ultrasonication emerged as a promising technique for microalgae separation in terms of repeatability and reproducibility. This study suggests the potential for selecting optimal pre-treatment methods to effectively operate real-time online monitoring devices, paving the way for future research and applications in microalgae cultivation and imaging.

• Journal of Fisheries and Marine Sciences Education
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• v.26 no.2
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• pp.335-344
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• 2014

The purpose of this study is to investigate the effects of self-efficacy and social support on career decision level for fisheries and merchant marine high school students. And it will help improving the Fisheries and Merchant Marine High School students' career decision level. To achieve the purpose of this research, the study carried out a survey targeting 456 fisheries and merchant marine high school students. Analysis methods includes Frequency Analysis, One way ANOVA, t-test, and Regression Analysis and data was analyzed by PASW Statistics 18. The results are as follows: First, fisheries and merchant marine high school students' self-efficacy and social support were generally positive. Second, The effects of the grade, the major and the school of students on self-efficacy showed statistically significant difference. Third, the higher self-efficacy and social support of students were, the higher career decision level was. Lastly, The effects of self-efficacy and social support on career decision level were valued positive.

• Proceedings of the KIEE Conference
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• 2008.04c
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• pp.155-157
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• 2008

An electric multiple unit(EMU) consists of car body, bogie and brake equipment which is directly related to safety and performance of the motorcar. The blending brake mixed an electric brake and a friction brake is to reduce the energy by applying the restoration energy caused when the motorcar is stopped to car lines and to curtail the maintenance cost by saving the friction brake use. We have developed the advanced EMU since 2004, based on the experiences on the standard EMU in 1999, and we develop the installation which minimizes the use rate of the friction air brake by maximizing the electric brake use in the existing blending brake. We could accomplish the goal by improving the motorcar's Performance and solving the restoration energy's deficit by the friction brake. Actually, when it comes to the test results of standard EMU, except the service brake, in most conditions, we use electric brake to meet the requirements of the necessary brake power, exclusive when the motorcar leaves and stops. Therefore, in this paper, we consider the design concept of motorcar's blending brakes and suggest the way to develop the blending brake using the electric brake maximumly, which is caused by adequately controling the electric brake and the restoration brake.

• Journal of Korean Academy of Nursing Administration
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• v.22 no.5
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• pp.507-517
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• 2016

Purpose: The local public hospitals in Korea are regarded as institutions that must consider the provision of good quality public health services, as well as profitability. Therefore it is important to improve nursing services to produce positive change in local public hospitals. This study was done to examine the relationships between self efficacy, organizational commitment, customer orientation and nursing performance for nurses in local public hospitals. Methods: For this study, 5 of 34 institutions were selected through random sampling: and 134 nurses working in local public hospitals were selected. Data were collected from March 28 to April 8, 2016 using self-report questionnaires. Collected data were analyzed using independent t-test, one-way ANOVA, $Scheff{\acute{e}}$ test, Pearson correlation coefficient and multiple regression with SPSS/WIN 18.0. Results: The major findings are summarized as follows: (1) There were significant positive correlations between self efficacy, organizational commitment, customer orientation, and nursing performance. (2) The factors affecting nursing performance were self efficacy, organizational commitment, and customer orientation, in that order, and these variables explained 57% of nursing performance. Conclusion: Administrators in local public hospitals should use the results of this study to develop a strategy for improving nursing performance.

• Journal of KIBIM
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• v.3 no.3
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• pp.29-38
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• 2013

Domestic construction industry is larger in size, and its shape is more complex. As a result, collaboration and information management tasks are difficult to manage in a way that conventional 2D-based exchange of information. BIM technology was introduced as a solution for this. But BIM only provides a very limited set of features such as Constructability review, clash detection in reality. and duplication of work and a lot of iterations occurs in BIM process. Thus, it takes quite a lot time to work. We studied how to improve the work efficiency by connecting API to business processes. Using the API in the integration process by automating repetitive tasks, reduce a significant amount of work time Using API (Automation, Optimization, Interoperability, Analysis) can solve the task problem that does not solved by the basic features, If we make good use of the combined API will be improved productivity.

• YAKHAK HOEJI
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• v.57 no.3
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• pp.173-186
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• 2013

To ensure the safe use of pharmaceuticals in the market, US, EU and Japan reached a consensus to adopt ICH harmonised tripartite guideline "E2E Pharmacovigilance Planning" in 2004. Subsequently these regions established and implemented new pharmaceutical safety management systems for patients based on ICH E2E guideline and Risk Evaluation and Mitigation Strategy (REMS) in US or Risk Management Plan (RMP) in EU and Japan. In this study we investigated these new foreign systems and suggested a way to improve Korea's regulatory system for pharmaceutical safety management under Korea Pharmaceutical Law in the view of international harmonization.

• East Asian Journal of Business Economics (EAJBE)
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• v.3 no.4
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• pp.21-28
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• 2015

With CJK FTA as a starting point, this paper mainly studied the role of the logistics legal system in promoting marine industrial cooperation, facilitating investment trade, establishing international transport logistics, building marine economy international cooperation demonstration zone and deepening the economic and financial cooperation between China, Japan and Korea, and explored the way to establish an integrated logistics system between China, Japan and Korea to match the e-commerce certification system, online payment system and logistics distribution, thereby gradually promoting economic development and logistics integration in Northeast Asia, improving logistics efficiency, reducing logistics costs and establishing a unified logistics industry standardization system. This will accelerate logistics industry integration in Northeast Asia, build a unified logistics management center in Northeast Asia, and promote a new model of integrated logistics cooperation in Northeast Asia. Therefore, it has a practical and reference significance. In short, the improvement for the logistics legal system in CJK FTA is not the responsibility of a country or several countries. It concerns the development and prosperity for the logistics industry in the three countries and is an inevitable choice to promote the vigorous development of CJK FTA and economic take-off of each country.

• Journal of Plant Biotechnology
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• v.35 no.1
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• pp.5-12
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• 2008

The transgenic technologies and their product (living modified organisms) have been developed and commercialized enough to get much attention in terms of their potentials to solve the current global difficulties such as shortage of food and energy. Furthermore, they are expected to make a big role in improving human health levels and creating bio-economy as innovative tools to pursue environmentally sound economic development. However, for the technologies and products to be developed and used in such a way that they continuously give a good impact to human society, first and foremost safety issues surrounding them should be dealt with. Every stage from in-house R&D, pilot field application to on the shelves should be managed to ensure safety following them because many consumers tend to have fear before they get the right or needed information on the modern biotechnology. In this sense, managing research facilities and LMOs for R&D from the point of safety is very crucial in that they are in the early stage of technology or product development. This paper especially deals with those to be complied with by researchers according to the Act on transboundary movement of LMOs, etc, entered into the effect from Jan. 1 2008.