• Journal of Korean Association for Spatial Structures
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• v.14 no.3
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• pp.75-84
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• 2014

When adjacent tall buildings experience earthquake excitation, structural pounding may happen. In order to mitigate seismic pounding damage to adjacent structures, many studies have been done to date. Tuned mass dampers (TMD) are widely used for reduction of dynamic responses of building structures subjected to earthquake excitations. If a TMD is shared between adjacent buildings and it shows good control performance, it will be effective and economic means to reduce seismic responses of adjacent structures. In this study, control performance of a shared tuned mass damper (STMD) for seismic response reduction of adjacent buildings has been evaluated. For this purpose, two 8-story example buildings were used and multi-objective genetic algorithms has been employed for optimal design of the stiffness and damping parameters of the STMD. Based on numerical analyses, it has been shown that a STMD can effectively control dynamic responses and reduce the effect of pounding between adjacent buildings subjected to earthquake excitations in comparison with a traditional TMD.

• International Journal of Contents
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• v.14 no.4
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• pp.70-75
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• 2018

The purpose of this corpus-based study was to find 4-word lexical bundles in computer science research articles. As the demand for research articles (RAs) for international publication increases, the need for acquiring field-specific writing conventions for this academic genre has become a burning issue. Particularly, one area of burgeoning interest in the examination of rhetorical structures and linguistic features of RAs is the use of lexical bundles, the indispensable building blocks that make up an academic discourse. To illustrate, different academic discourses rely on distinctive repertoires of lexical bundles. Because lexical bundles are often acquired as a whole, the recurring multi-word sequences can be retrieved automatically to make written discourse more fluent and natural. Therefore, the proper use of rhetorical devices specific to a particular discipline can be a vital indicator of success within the discourse communities. Hence, to identify linguistic features that make up specific registers, this corpus-based study examines the types and usage frequency of lexical bundles in the discipline of CS, one of the most in-demand fields world over. Given that lexical bundles are empirically-derived formulaic multi-word units, identifying core lexical bundles used in RAs, they may provide insights into the specificity of particular CS text types. This will in turn provide empirical evidence of register specificity and technicality within the academic discourse of computer science. As in the results, pedagogical implications and suggestions for future research are discussed.

• Journal of the Korean housing association
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• v.21 no.5
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• pp.93-101
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• 2010

The purpose of the study is to investigate the behaviors for ventilation to control indoor air quality and characteristics of the maintenance for ventilation equipments by multi-family housing residents. This study was conducted by the survey in the area of Seoul and Kyungki-do. The results of the study are as follows: the majority of respondents conduct ventilation once a day, below 20 minutes with opening some windows of the inside of the house. The time for ventilation is generally between 9-11 am. and 5-7 pm. Most of the wives are responsible for ventilation activities. In addition, so far building materials and furniture are not seriously considered as the source of indoor air pollution by the respondents. Their satisfaction for indoor air before and after ventilation is perceived as just the level of average. As the mechanical ventilation equipments such as a hood and an exhaust fan, half of the respondents are using them frequently. However, the ventilation equipments are not maintained well. Specially maintenance and checks for exhaust fans are hardly conducted. In conclusion, the frequency of ventilation is very limited and residents show passive attitudes about ventilation and maintenance of ventilation equipments. Therefore, for the actualization of healthy housing, educational programs and guidelines on the way of ventilation targeting the residents should be set up and a certain organization has to check periodically the performance of the ventilation equipments of each house in the multi-family housing complex.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.3
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• pp.339-359
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• 2018

The purpose of this study is to suggest a strategy of introduction of Larchiveum, which is a concept of multi cultural space in libraries. Problem of library space programs are discussed in terms of Larchiveum and Maker space, and recently it has been studied in various aspects such as Europeana, GLAM and DPLA from the view point of digital Larchiveum. As a multi cultural space, it is a strategy for constructing Larchiveum that reflects the recent maker's movement. Maker space that explores new ideas and encourages active participation of users, nature and health, curiosity and the construction of an attractive space using ecological concepts as key words. The processes and methods for constructing Larchiveum are classified into 3 types of space configuration, service, program, and operating regulation, and twelve details are laid out to derive the process and method of building Larchiveum as a future type library.

• International journal of advanced smart convergence
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• v.8 no.2
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• pp.109-115
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• 2019

Currently, LPWA(Low Power Wide Area) communication technology is widely used due to the development of IoT(Internet of Things) technology. Among the LPWA technologies, LoRaWAN(Long Range Wide Area Network) is widely used in many fields due to its wide coverage, stable communication speed, and low-cost modem module prices. In particular, LoRa(Long Range) can easily construct LoRaWAN with a dedicated gateway. So many organizations are building their own LoRaWAN-based networks. The LoRaWAN Gateway receives the LoRa packet transmitted from an End-device installed in the adjacent location, converts it into the Internet protocol, and sends the packet to the final destination server. Current LoRa Gateway uses a single-hop method, and each gateway must include a communication network capable of the Internet. If it is the mobile communication(i.e., WCDMA, LTE, etc.) network, it is required to pay the internet usage fee which is installed in each gateway. If the LoRa communication is frequent, the user has to spend a lot of money. We propose an idea on how to design a multi-hop protocol which enables packet routing between gateways by analyzing the LoRaWAN communication method implemented in its existing single-hop way in this paper. For this purpose, this paper provides an analysis of the standard specification of LoRaWAN and explains what was considered when such protocol was designed. In this paper, two gateways have been placed based on the functional role so as to make the multi-hop protocol realized: (i) hopping gateway which receives packets from the end-device and forwards them to another gateway; and (ii) main gateway which finally transmits packets forwarded from the hopping gateway to the server via internet. Moreover, taking into account that LoRaWAN is wireless mobile communication, a level-based routing method is also included. If the protocol proposed by this paper is applied to the LoRaWAN network, the monthly internet fee incurred for the gateway will be reduced and the reliability of data transmission will be increased.

• International Commerce and Information Review
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• v.18 no.3
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• pp.307-327
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• 2016

This study was conducted to investigate the role of the type of strategies on the relationship organizational culture, strategics activities and the export performance of manufacturing SMEs. This study analyzed the moderated effects of type of strategies between the organizational culture, strategic activities and the export performance of SMEs. This study suggested 20 questions latent variables based on existing research. Organizational culture were divided into adhocracy culture and market culture and strategy types were divided into prospectors and defenders. The sample SMEs be analyzed were 200 firms. The 7 hypotheses including moderated effects were analyzed by using LISREL as structural equation modeling. In the result of empirical analysis, the adhocracy culture indicates a positive effect on customer relationship building activities but product quality assurance activities was not significant. Market culture showed a positive impact on both customer relationship building and quality assurance activities. This study conducted multi-group analysis for the purpose of the moderated effects of type of strategies. Multi-group analysis results showed that there are difference effects between the relationship of adhocracy culture, customer relationship building activities and product quality assurance activities. In addition, the group choice adhocracy culture based on the prospectors strategy had a greater impact than the market culture group on the relationship building activities and export performance.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.10
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• pp.143-150
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• 2018

Periodic and systemic disaster management has become more important than ever owing to the recent continuous occurrence of disasters, such as fires, earthquakes, and flooding. This management goes beyond simple disaster preparedness, which was introduced minimally under the existing legal system. For effective disaster management, facilities should be managed through regular maintenance on a daily basis, and in the case of an emergency, intuitive and accurate communication is essential regarding the situation and purpose. BIM manages the entire building property data using the effective 3D visualization model, so it can be used for various management purposes from design to facility maintenance. In this study, through an expert survey on the use of services in a BIM-based integrated disaster information system, the available areas of BIM data were organized in terms of facility information management, 3D visualization, and disaster control. Later, through the use service and DB definition within the BIM-based disaster integration information system, the main facilities monitoring and response services based on BIM and BIM-based spatial management service are proposed. Based on this study, it is hoped that the BIM-based application service functions within the system will be implemented to enable an effective system response.

• Journal of the Korean Society of Marine Environment & Safety
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• v.22 no.4
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• pp.354-361
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• 2016

While the amounts of oil spill caused by the VLCC Hebei Spirit indicated 2.5 times more than that of the VLCC Sea Prince, the economic, environmental, and social damages derived from the Hebei Spirit spill were estimated to be about 30 times greater than those from the Sea Prince incident. This study consolidates the appropriate justification for building a multi-purpose large oil spill response vessel to allow swift and efficient handling of catastrophic marine pollution events through an analysis of technical and economic feasibility of such a project. The result of the technical feasibility analysis illustrates that a hopper dredge and oil spill response vessel with a capacity of 4,000 tons should be more appropriate. The result of the economic feasibility analysis indicates that under the most conservative estimates the project appears to be slightly impractical, with a benefit/cost ratio of 0.82, in which self-help efforts, however, can facilitate the project. And medium to optimistic estimates present benefit/cost ratios are estimated to be 2.72 and 5.82 respectively, representing apparent economic feasibility.

• IE interfaces
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• v.20 no.3
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• pp.395-406
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• 2007

In the telecommunication industry, estimation of the cost of network facilities is very important since depreciation cost of the facilities accounts for a large portion of the product cost. Moreover, cost estimation in the industry becomes more difficult because of increasing indirect cost upon digital convergence, expanding multi-purpose facilities, complexity of service product, etc. Nevertheless, not much seem to have been done in improving estimation methodology of the cost of network facilities. As a result, the quality of cost information on network facilities has deteriorated, and now even decision-makers in the industry dismiss the information. Recently, two major telecommunication companies adopted a new network cost estimation method to deal with the issue. In this paper, we study the concept of new cost estimation method and the procedure to develop and apply it. We also suggest the method to carry out the cost allocation using Matlab which is more efficient and time-saving than other commercial cost calculation packages.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2006.05a
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• pp.97-98
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• 2006

This study proposes a method of generating steel house shop drawing in an automated design method, reducing construction manpower and period. With one hour fire-resistant approval code, reflecting work ability and efficiency, steel-framed house market is expected to extend from one or two story house to multi-purpose facilities up to four story height. More models have been constructed in this system than the first appearance of fire-resistant approval in Korea in 1997 Also, cost estimation of components such as frame walls, roof trusses and floors is obtained with shop drawings. Also, the lack of suppliers of steel framed house shop drawing and unstandardized drawing method get constructors have difficulty in understanding its design. In steel framed house industry, shop drawings are essential part in building and constructing framework and they have major effects on construction deadlines and expenses. By exploring method of shop drawing automation, this study aims to optimize work flow with a standardized drawing method. The proposed system can be applied to manufacturing automation in domestic industry of factory-built panelizing method in the near future.