• Journal of the Earthquake Engineering Society of Korea
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• v.17 no.1
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• pp.21-31
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• 2013

In this study, dynamic characteristics and seismic capacity of the nuclear power plant piping system are evaluated by model test results using multi-platform shake table. The model is 21.2 m long and consists of straight pipes, elbows, and reducers. The stainless steel pipe diameters are 60.3 mm (2 in.) and 88.9 mm (3 in.) and the system was assembled in accordance with ASME code criteria. The dynamic characteristics such as natural frequency, damping and acceleration responses of the piping system were estimated using the measured acceleration, displacement and strain data. The natural frequencies of the specimen were not changed significantly before and after the testing and the failure and leakage of the piping system was not observed until the final excitation. The damping ratio was estimated in the range of 3.13 ~ 4.98 % and it is found that the allowable stress(345 MPa) according to ASME criteria is 2.5 times larger than the measured maximum stress (138 MPa) of the piping system even under the maximum excitation level of this test.

• Journal of architectural history
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• v.7 no.2 s.15
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• pp.29-48
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• 1998

The first Pagoda of Korea was introduced from China, and adapted from the wooden multi-storied pavilion. Also in Bronze one, multi-storied type of wooden pagoda was adapted. Bronze pagoda was used to buddhist ossuary and a kind of metalwork. Metalworks were made of gold, silver, copper, or iron by one of the methods of production-casting or hammering and decorated design of incision, raise, openwork, gold- plating or inlaying with gold and silver. Sometimes it was used as the easy carriage of Buddha image by guess. In most cases, the plan of Bronze pagoda was square and podium was one story. but in the advance of podium two-storied platform appeared. Column appeared in a symbol, so it didn't appear in a square and circular form. It means that the column was vertical member which only divided the wall. In koryo period, Gabled roof and Half-hipped roof was spreaded in public but Bronze pagoda was used to square Hipped roof. Vertical shaft over roof(上輪部), apart from body of pagoda(塔身部), was inserted on the hole above the Bokbal(覆鉢) for the balance of pagoda. And a thick iron bar put in the roof to the platform. It was sustained the balance of pagoda. The stories of pagoda were various from 3rd stories to 9, the lower stories was larger scale and the higher was smaller one.

• Journal of Convergence Society for SMB
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• v.3 no.1
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• pp.1-6
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• 2013

As the important of software quality has being emphasized, the studies on software architecture also have being performed actively. On the other hand, due to the diversification of Smartphone platforms, the effort was increased to develop the application for supporting those multiple platforms. However several solutions are suggested to reduce the effort, and a representative solution is FireMonkey framework. In this paper, we represent the FireMonkey framework using ACME which is a language to describe software architecture. Such representation can provide the guideline to develop the application for the multiple platforms. Also it supports the information of that which perspectives are critical to develop such applications.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.493-494
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• 2009

Mobile phone is becoming multi-functionality devices rather than simply communication machine devices. Now, the mobile keep the run of the PC and much technical progress has been made. Recently, the Android open mobile platform has emerged, as they unveiled the Software Developer Kit to be possible to develop on the Android open mobile platform, it could be possible directly to make innovative Application development. Therefore, in this paper, a characteristic of a mobile mobility and multi-functionality is can for everyone easily compose music by built the music compose system.

• Journal of Platform Technology
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• v.10 no.2
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• pp.3-9
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• 2022

In this paper, to maximize the performance of the scatter communication in multi-core and many-core processors, a technique that considers the communication situation of the processing node is applied to a multi-core processor composed of 32 processing nodes. Since the existing scatter algorithm cannot recognize the communication conditions of the processing nodes, communication is generally performed according to an initially set transmission order. In this case, scatter communication starts only after the communication currently being performed by all processing nodes inside the processor is finished. The scatter communication performance was improved by this technique, and it was confirmed that there was a performance improvement of up to 78.93% compared to the existing algorithm through BFM simulation.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1224-1227
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• 2008

송변전자동화시스템에서 사용하는 주장치 와 RTU간에는 무선 통신망으로 TRS(Trunked Radio System), CMDA(Code Division Multiple Access) 그리고 에어미디어망을 사용하고 있다. 특히 디지털 TRS기술인 유럽 전자 통신 표준기구인 ETSI에서 개발한 TETRA는 임대망인 CDMA와 에어미디어망과는 달리 비임대망으로 비용적인 장점을 가지고 있다. 본 논문은 송변전자동화시스템에서 주장치 기능을 하는 DNP3.0 주장치 서버와 RTU의 기능을 하는 FRTU간에 TETRA 망을 사용할 수 있도록 MFTG(Multi Function Tetra Gateway) Platform을 구현하였다.

• Smart Media Journal
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• v.12 no.9
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• pp.38-44
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• 2023

In this paper, a blockchain-based platform of NFT(Non-Fungible Token) reports was proposed to ensure the reliable performance contents of field study trip. It is possible to identify and manage the personal multi biomeric authentication user ID of activity records for students in a mobile IP-based metaverse with the linkage of extended reality(XR). At this time, many quests and incentives of platform are provided to induce students to experience smart and fun field studying facilities by linking real trip experiences and virtual extended_reality studies in the metaverse interworking.

• Journal of the Korean Institute of Intelligent Systems
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• v.25 no.4
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• pp.398-404
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• 2015

In this paper, we describe the design and performance of a prototype multi-rotor unmaned aerial vehicle( UAV) platform featuring an inertial measurement unit(IMU) based autonomous-flying for use in bluetooth communication environments. Although there has been a fair amount of study of free-flying UAV with multi-rotors, the more recent trend has been to outfit hexarotor helicopter with gimbal to support various services. This paper introduces the hardware and software systems toward very compact and autonomous hexarotors, where they can perform search, rescue, and surveillance missions without external assistance systems like ground station computers, high-performance remote control devices or vision system. The proposed system comprises the construction of the test hexarotor platform, the implementation of an IMU, mathematical modeling and simulation in the helicopter. Furthermore, the hexarotor helicopter with implemented IMU is connected with a micro controller unit(MCU)(ARM-cortex) board. The micro-controller is able to command the rotational speed of the rotors and to get the measurements of the IMU as input signals. The control simulation and experiment on the real system are implemented in the test platform, evaluated and compared against each other.

• Journal of KIISE
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• v.43 no.6
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• pp.613-620
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• 2016

This paper presents a MOHA(Many-Task Computing on Hadoop) framework which aims to effectively apply the Many-Task Computing(MTC) technologies originally developed for high-performance processing of many tasks, to the existing Big Data processing platform Hadoop. We present basic concepts, motivation, preliminary results of PoC based on distributed message queue, and future research directions of MOHA. MTC applications may have relatively low I/O requirements per task. However, a very large number of tasks should be efficiently processed with potentially heavy inter-communications based on files. Therefore, MTC applications can show another pattern of data-intensive workloads compared to existing Hadoop applications, typically based on relatively large data block sizes. Through an effective convergence of MTC and Big Data technologies, we can introduce a new MOHA framework which can support the large-scale scientific applications along with the Hadoop ecosystem, which is evolving into a multi-application platform.

• Journal of Korea Multimedia Society
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• v.17 no.3
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• pp.364-372
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• 2014

This research enables the user to have access to the desired service which is on the multi-platform display device by establishment customized Digital Signage System using the SaaS method. This system is significantly favorable due to the following points: the expandibility and portability is outstanding compared with the existing signage system, establishment expenses may be reduced because the platform can be established in various configurations independently, maintenance and management, and the strong point of the system is that costs can be reduced due to the fact that the electric power can be controlled according to environmental situations. Various researches should be conducted simultaneously such as researches on automatic pattern recognition technologies which recognizes the sex, age, location among other data of the user and various methods of image processing for the production of contents to elaborate lively contents to provide diverse experience and enjoyable configurations for the future generation.