• International Journal of Railway
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• v.8 no.2
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• pp.50-54
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• 2015

The primary function of the trackbed in a conventional railway track system is to decrease the stresses in the subgrade to be in an acceptable level. A properly designed trackbed layer performs this task adequately. Many design procedures have used assumed and/or are based on critical stiffness values of the layers obtained mostly in the field to calculate an appropriate thickness of the sublayers of the trackbed foundation. However, those stiffness values do not consider strain levels clearly and precisely in the layers. This study proposes a method of computation of stiffness that can handle with strain level in the layers of the trackbed foundation in order to provide properly selected design values of the stiffness of the layers. The shear modulus values are dependent on shear strain level so that the strain levels generated in the subgrade in the trackbed under wheel loading and below plate of Repeated Plate Bearing Test (RPBT) are investigated by finite element analysis program ABAQUS and PLAXIS programs. The strain levels generated in the subgrade from RPBT are compared to those values from RC (Resonant Column) test after some consideration of strain levels and stress consideration. For comparison of shear modulus G obtained from RC test and stiffness moduli $E_{v2}$ obtained from RPBT in the field, many numbers of mid-size RC tests in laboratory and RPBT in field were performed extensively. It was found in this study that there is a big difference in stiffness modulus when the converted $E_{v2}$ values were compared to those values of RC test. It is verified in this study that it is necessary to use precise and increased loading steps to construct nonlinear curves from RPBT in order to get correct $E_{v2}$ values in proper strain levels.

• Korean Institute of Interior Design Journal
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• v.21 no.3
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• pp.119-127
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• 2012

In correlation to the rapid growth of Korea's economy and increased international exchange, hotel architecture in Korea has likewise evolutionized in its own distinctive style. Since hotels accomodate foreign visitors, they should be representative of the local architecture in which they reside, to add to the experience of the regions culture. City hotels provide not only primary housing functions but also many different varieties of services. Furthermore, city hotels operate as a focal point for their local communities. Seoul announced special measures for the expansion of accommodations for foreign tourists, and a large number of hotel construction entities have consequently propagated. Unfortunately, the designs for most of these new hotels have failed to reflect their local cultural characteristics, with most having similar designs and programs. As Korea enters an era seeing ten million foreign tourists annually, progressive reform is especially necessary. Space marketing, which is based on strategies of cultural experience, is a crucial element to city boutique hotel planning. It must be applied to satisfy both the cultural needs of its local communities and well as to vitalize the local economy through development of cultural tourism. To date, there have been numerous studies on boutique hotels and space marketing. However, most of these studies are limited to interior designs and artistic trends rather than focusing on the unique architectural and public aspects of their respective cities. In this thesis, the overall aim and strategies of space marketing for the city boutique hotel are analyzed, and the elements of strategies are used for further case analysis. The purpose of this study is to find applicability of Korean boutique hotel development through the result of case studies. Also, this thesis aims to advocate space marketing for Korea's forthcoming boutique hotels, as a means to showcase its unique cultural assets as well as to advance its international appeal and competitiveness.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.28 no.4
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• pp.809-826
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• 2018

The entropy evaluation method for noise sources is one of the evaluation methods for the random number generator that is the essential element of modern cryptographic systems and cryptographic modules. The primary entropy evaluation methods outside of the country are more suitable to apply to hardware noise sources than software noise sources, and there is a difficulty in quantitative evaluation of entropy by software noise source. In this paper, we propose an entropy evaluation method that is suitable for software noise sources, considering characteristics of software noise sources. We select time-dependent noise sources that are software noise sources of Windows OS, and the heuristic analysis and experimental analysis are performed considering the characteristics of each time-dependent noise source. Based on these analyses, we propose an entropy harvest method from the noise source and the min-entropy estimation method as the entropy evaluation method for time-dependent noise sources. We also show how to use our entropy evaluation method in the Conditioning Component described in SP 800-90B of NIST(USA).

• Journal of Korean Society of Steel Construction
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• v.20 no.4
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• pp.561-570
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• 2008

The primary object of the paper is to identify the compression forces and inelastic failure behavior using steel plate-concrete structures. The compression tests were carried out for the three types of B/tratios by 25, 33 and 50. The tests proved that the compressive strength of the SC structures can be estimated by the summation of strengths both of the steel plate and concrete. The buckling of the steel plates had been occurring at the plates between studs. The empirical estimation of compressive strength for unstiffened SC structures under compressive loadings was suggested. The buckling behavior was also compared with the results of the finite element analysis.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.35 no.2
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• pp.201-206
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• 2011

A spacer grid assembly is one of the most important structural components of the nuclear fuel assembly of a pressurized water reactor (PWR), and it affects the performance of the fuel assembly. The primary design requirement is that the mechanical integrity of the fuel rod should be maintained by the spacer grid assembly during the operation of the reactor. It was known that fretting damage to the fuel rod can be reduced by adjusting the relative moving displacement between the fuel rod and its support. In this study, we used the finite element method to evaluate the characteristics of a sliding support designed to reduce fretting damage of fuel rods.

• Journal of Physiology & Pathology in Korean Medicine
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• v.17 no.4
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• pp.845-851
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• 2003

The objective is to establish the standard of criteria for differential diagnosis of signs and symptoms. This study selected signs and symptoms related to heart which stands for Fire(火) as a kind of five phase(五行). Eleven experts was asked to evaluate the adequateness of criteria which was developed by Korea Institute of Oriental Medicine(KIOM) and to suggest the amendment of them. To implement the study, we used the questionnaire which asks about the diagnosis criteria for an insufficiency of the heart-qi(心氣虛證), deficiency of the heart blood(心血氣證), deficiency of the heart-yin(心陰虛證), insufficiency of the heart-yang(心陽虛證), exuberant fire due to hyperactivity of the heart(心火亢盛證), stagnation of the heart blood(心血瘀阻證), heart disturbed by phlegm-fire(痰火擾心證), attack of the heart by retainedfluid(水氣凌心證). Every criteria consists of primary symptoms, secondary symptoms, tongue findings. and pulse findings. In perspectives of the classification of patterns for signs and symptoms and criteria for diagnosis, the result shows that the previous standard doesn't have so many problem. So many of experts were agree with the criteria which was suggested but the trend is that they use, in their actual practice, less than the criteria. Additionally, they pointed that every element in a criterion should have the different weight value, criteria for the overlapped pattern should be added, and, in future, criteria which are based on clinical investigation should be established.

• Journal of Drive and Control
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• v.13 no.2
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• pp.34-41
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• 2016

Unlike the commonly used On/Off solenoid, constant attraction force which is independent of plunger displacement is a considerably important characteristic to proportional solenoid of the EPPR Valve. Attraction force uniformity is mainly affected by the internal shape design parameters. Due to a number of shape design parameters, the optimal parameter values are very complex and time consuming to find by trial and error method. Much research has been conducted or are still in progress to find the optimal parameter values by applying various optimization techniques like Genetic Algorithm, Evolution Strategy, Simulated Annealing, or the Taguchi method. In this paper, the design parameters which have primary effects on the attraction force uniformity and the average attraction force are decided by main effects analysis of Design of Experiments. Optimal parameter values are derived using finite-element analysis and a neural network model.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.6
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• pp.1069-1076
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• 2007

DOCSIS 3.0 protocol are proposed to support high-speed cable network DOCSIS 3.0 MAC protocol regulates CM and CMTS channel transfer times through MAP message. So MAP Inter-arrival time is primary factor of network performance. However, standards does not include the details of MAP Inter-arrival Time affecting the performance of MAC protocols for DOCSIS 3.0. In this paper, we evaluated the performance of DOCSIS 3.0 protocol follow in MAP Inter-arrival Time. Based on the evaluation results, we propose the optimal MAP Inter-arrival Time. We found that the protocol shows best performance when the MAP Inter-arrival Time is 0.05sec. The research results can apply to performance element which important for the construction of DOCSIS 3.0 base cable networks.

• Journal of Digital Convergence
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• v.19 no.12
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• pp.389-395
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• 2021

This study aims to evaluate the user experience of leading handmade product market service applications, Etsy and idus. A survey about the apps was developed based on Peter Morville's user experience factors. The survey was conducted with eleven users from their 20s to 50s. In addition, problems were discovered through an in-depth interview and the resulting user experience problems were analyzed according to the five levels of Jesse James Garrett's user experience element framework. Our primary results for both apps suggest applying a universally accepted visual interface to improve the user experience, providing brief text to improve readability, avoiding repetitive delivery of similar functions in different information structures, and applying design patterns that are considerate of customers' culture and country. This study provides meaningful data to elevate handmade product platforms into global platforms by analyzing and providing improvements to their shopping experiences.

• Journal of Korean Theatre Studies Association
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• no.48
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• pp.127-170
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• 2012

The primary concerns of this thesis simply stems from the curiosity of how the playwright Kim Jihoon lookouts a peculiar change of our spiritual, physical world. His lately work, , deals with a tribe of mixed blood who are either not shared by, or excluded from a national system, putting the writer's emphasis on some hints that informs us his outlook on the world. And these hints summon the following doubts. What is the significance of constituting a national community in this age, particularly in the time when the end of national people is frequently being referred? In strengthening national compositions, can the national identity be a pivotal element and central mechanism? Can the identity be able to exercise the hegemonic functions containing the political rights of decisions? Does the identity still dominate the various collective bodies such as genders, races, regions, professions, generations and classes etc? Finally, as the manifests, can the national identity be a desirable alternative that may cease both confusions and disorders evoked by the collision of heterogeneity? To find the answer, the study starts from a search for the origin of the complexities immanent in the mixed blood. The terror syndrome and the ambiguous identity, both residing outside the border of normality, will characterise the origin. Then I will focus both on the tribe's desperation itself and their present hope, in order. A myth of creating a country, making history and nationalism, all these are converged in their resistant ideology. This thesis ends with no clear conclusion, and yet suggesting the three presumptions the text insinuates: nomadism, a new barbarism, and the heterogeneity that awaits for our re-reading, and hoping that the three will lead the 'being-to-come' of the tribe, as an alternative of their future.