• Proceedings of the Korean Nuclear Society Conference
• /
• 2003.10a
• /
• pp.232.2-232.2
• /
• 2003

• Proceedings of the Korean Society For Composite Materials Conference
• /
• 2001.05a
• /
• pp.201-204
• /
• 2001

A Confocal Laser Scanning Microscope (CLSM) is applied to determine three-dimensional fiber orientation states in injection-molded short fiber composites. Since the CLSM optically sections the composites, more than two planes either on or below the surface of composites can be obtained. Therefore, three dimensional fiber orientation states are determined without destruction. To predict the orientation states, velocity and temperature fields are calculated by using a hybrid FEM/FDM method. The change of orientation state during packing stage is also considered by employing a compressible Hele-Shaw model. The predicted orientation states show good agreement with measured ones. However, some differences are found at the end of cavity. They may result from other effects, which are not considered in the numerical analysis.

• Journal of Photoscience
• /
• v.5 no.4
• /
• pp.175-179
• /
• 1998

In this paper, a brief overview of nanocrystallites of metal and semi-conductor materials will be presented, and then the novel synthetic method of high quality CdSe nanocrystallites developed by Bawendi group at MIT will be introduced . It will be shown that results of optical properties of surface modified nanocrystallites give the evidence that the luminescence of CdSe nanocrystallites is not originated from surface related trap states, but from intrinsic spin forbidden core states. Some of the interesting applications of CdSe nano-crystallites will also be discussed at the end.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2003.04a
• /
• pp.272-277
• /
• 2003

In order to predict vibration during end-milling process, the cutting dynamics was modelled by using neural network and combined with structural dynamics by considering dynamic cutting states. Specific cutting constants of the cutting dynamics model were obtained by averaging cutting forces and tool diameter, cutting speed, feed, axial depth radial depth were considered as machining factors. Cutting farces by test and by neural network simulation were compared and the vibration during end-milling was simulated.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1996.11a
• /
• pp.678-682
• /
• 1996

Acoustic emission(AE) is monitored during end milling with a sensor attached to the cutting fluid discharge nozzle. Cutting forces are also measured and compared with the AE signals to examine the reliability of the AE signals. It is demonstrated that the AE signals provide reliable informations about the cutting processes and tool states. Moreover, edge chipping and fracture of tools can be successfully detected using both the AE signals and cutting forces.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.8 no.11
• /
• pp.4016-4027
• /
• 2014

Understanding network latency is important for providing consistent and acceptable levels of services in network-based applications. However, due to the difficulty of estimating applications' network demands and the difficulty of network latency modeling the management of network resources has often been ignored. We expect that, since network latency repeats cycles of congested states, a systematic classification method for network status would be helpful to simplify issues in network resource managements. This paper presents a simple empirical method to classify network status with a real operational network. By observing oscillating behavior of end-to-end latency we determine networks' status in run time. Five typical network statuses are defined based on a long-term stability and a short-term burstiness. By investigating prediction accuracies of several simple numerical models we show the effectiveness of the network status classification. Experimental results show that around 80% reduction in prediction errors depending on network status.

• 한국사회복지학회:학술대회논문집
• /
• 2002.10a
• /
• pp.227-263
• /
• 2002

The Scandinavian cluster of welfare societies has for many years been considered a realisation of Richard Titmuss' institutional redistributive model of social policy. Recent reforms have, however challenged this assumption. The paper sets out to evaluate whether recent major changes in welfare provision are merely modifying the model or whether the Scandianian states are converging towards some kind of European social model. It is concluded that besides very many first order changes, such as reducing benefits, an number of second and third order changes have occurred; i.e. the institutional setting and the objective of the welfare states have changed during the 1990s. The Scandinavian welfare states are still distinct, but less so than a decade or two ago. The new elements are features usually associated with welfare models at play within the European Union. It is, hence, concluded that welfare in Scandinavia is undergoing a process of Europeanisation.

• Journal of applied mathematics & informatics
• /
• v.28 no.3_4
• /
• pp.639-649
• /
• 2010

In this paper, a definition of interval-valued fuzzy regular language (IVFRL) is proposed and their related properties studied. A model of finite automaton (DFA and NDFA) with interval-valued fuzzy transitions is proposed. Acceptance of interval-valued fuzzy regular language by the finite automaton (DFA and NDFA) with interval-valued fuzzy transitions are examined. Moreover, a definition of finite automaton (DFA and NDFA) with interval-valued fuzzy (final) states is proposed. Acceptance of interval-valued fuzzy regular language by the finite automaton (DFA and NDFA) with interval-valued fuzzy (final) states are also discussed. It is observed that, the model finite automaton (DFA and NDFA) with interval-valued fuzzy (final) states is more suitable than the model finite automaton (DFA and NDFA) with interval-valued fuzzy transitions for recognizing the interval-valued fuzzy regular language. In the end, interval-valued fuzzy regular expressions are defined. We can use the proposed interval-valued fuzzy regular expressions in lexical analysis.

• American Studies
• /
• v.44 no.1
• /
• pp.155-182
• /
• 2021

This study explores how American war films modify or reenact American exceptionalism depending on political and social situations in the United States. To this end, it analyzes the two war films, Saving Private Ryan and We Were Soldiers that were released before and after the 9/11 attacks as a critical juncture in the twenty first century, respectively. While the former conducts a partial modification on American exceptionalism in order to restore the national identity and moral authority of the United States lost ever since the Vietnam War, the latter demonstrates a complete reenactment of American exceptionalism in accordance with the foreign policy of the Bush administration and neoconservatism. It concludes with the illumination that the examination of American war films within the framework of American exceptionalism is efficacious in understanding from a broad perspective how American exceptionalism is utilized depending on political and social situations in the United States.

• Asia-Pacific Journal of Business
• /
• v.13 no.2
• /
• pp.183-195
• /
• 2022

Purpose - The study attempted to analyze how the U.S.-China trade dispute affects a highly trade-dependent South Korea. Currently, major domestic and international institutions have issued a number of conflicting predictions that the trade dispute between China and the United States will have a positive and negative impact on South Korea. Accordingly, the present study attempted to analyze using actual data. Design/methodology/approach - The analysis was conducted using actual import and export data from the United States and China and actual import and export data from the United States and China from South Korea. The analysis measured the number and amount of imports and exports by year and month, and the rate of increase and decrease. We also looked at trade dispute days, import and export outcomes and what the impact was. In addition, as a result of the US-China trade dispute, the amount of change in Korea's imports and exports was analyzed. Findings - Empirical analysis shows that South Korea's exports to the United States and China have increased. The analysis results are as follows. First, exports to the United States increased by 5.65% in 2018 and 6.45% in 2019 compared to 2017. Second, exports to China surged 12.34% in 2018 compared to 2017. This increase in South Korea's exports to the United States and its mass exports to the United States shows that South Korea has benefited from the trade dispute between the United States and China. Research implications or Originality - South Korea, which is highly trade-dependent, has been heavily affected by the U.S.-China trade dispute. Various predictions are made about this. The analysis showed that South Korea's export volume has increased. In the end, the effect of the trade transition to the 3rd country did not occur. Rather, the U.S.-China trade dispute appears to have helped South Korea.