• Journal of the Korea institute for structural maintenance and inspection
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• v.20 no.4
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• pp.1-8
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• 2016

Recently, buildings tend to be large size, complex shape and functional. As the size of buildings is becoming massive, the need for structural health monitoring(SHM) technique is ever-increasing. Various SHM techniques have been studied for buildings which have different dynamic characteristics and are influenced by various external loads. Generally, the visual inspection and non-destructive test for an accessible point of structures are performed by experts. But nowadays, the system is required which is online measurement and detect risk elements automatically without blind spots on structures. In this study, in order to consider the response of non-linear structures, proposed a signal feature extraction and the adaptive threshold setting algorithm utilized to determine the abnormal behavior by using statistical methods such as control chart, root mean square deviation, generalized extremely distribution. And the performance of that was validated by using the acceleration response of structures during earthquakes measuring system of forced vibration tests and actual operation.

• Journal of KIISE:Information Networking
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• v.30 no.4
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• pp.520-534
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• 2003

In this paper, a performance evaluation model of the Fat-tree Network with the multiple-buffered crossbar switches is proposed and examined. Buffered switch technique is well known to solve the data collision problem of the switch network. The proposed evaluation model is developed by investigating the transfer patterns of data packets in a switch with output-buffers. Two important parameters of the network performance, throughput and delay, are then evaluated. The proposed model takes simple and primitive switch networks, i.e., no flow control and drop packet, to demonstrate analysis procedures clearly. It, however, can not only be applied to any other complicate modern switch networks that have intelligent flow control but also estimate the performance of any size networks with multiple-buffered switches. To validate the proposed analysis model, the simulation is carried out on the various sizes of Fat-tree networks that uses the multiple buffered crossbar switches. Less than 2% differences between analysis and simulation results are observed.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.242-246
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• 2012

우리나라의 경우 비점오염원에 의한 오염부하 기여도가 점차 증가하면서 '06년 관련 법규 개정을 통해 일정 규모 이상의 개발사업에 대해서는 비점오염저감시설 설치를 의무화하였으며, '11년 기준 국내에는 약 6,000여개 이상의 저감시설이 설치되었다. 해당 시설에 대한 모니터링 결과 장치형에 비해 자연형이 처리효율 및 유지관리 측면에서 유리한 것으로 보고되면서 환경부는 개발사업에 대해 저영향개발기법(LID)의 적용을 의무화하는 방안을 추진 중이다. 개발사업에 있어 LID는 토지이용기법을 통해 우수 유출과 오염원 유출을 저감하고자 하는 기법으로, 비용 및 유지관리 측면에서는 유리하나 기존 단위시설 적용기법에 비해 계획적인 요소가 강해 적용 확대 및 의무화가 용이하지 않은 한계가 있다. 따라서, 본 연구에서는 LID 적용 확대와 관련된 문제점을 분석하고 적용 의무화를 위해 필요한 대안을 모색해 보고자 하였다. 이를 위해 해당 기법 자체가 가지는 한계와 제도적인 문제점을 분석하였으며, LID 기법의 확대 적용을 위해 필요한 대안을 제안하였다. 분석 결과, LID 기법은 기존 장치형 시설에 비해 계획기법의 측면이 커 기술개발이 어려울 뿐만 아니라, 저감시설의 적용여부에 대한 검증도 곤란한 것으로 분석되었다. 또한, 처리효율 계량화가 어려워 오염총량제와 연계된 오염부하 삭감효과 인정이 곤란해 확대 적용에 한계가 있는 것으로 나타났다. 상기의 분석결과에 근거할 때, LID 기법의 확대 적용은 국내의 제도적 여건 및 LID 기법 자체의 한계를 감안하여 단계적으로 추진되어야 할 것으로 판단되며, 조속한 확대 시행을 위해서는 다음의 방안 마련을 제안한다. 첫째, 적용 여부에 대한 판단이 모호한 단점을 보완하기 위해 적정 적용여부를 심의할 수 있는 인증제도 도입을 제안한다. 이 제도는 친환경건축물인증제도 등 기존 유사 제도에 항목을 추가하는 방법과 별도의 제도를 신설하는 방법이 가능할 것이다. 둘째, 처리효율 정량화를 위해 기존 농도 위주의 처리효율 개념을 벗어나 유량 개념의 처리효율 산정이 필요하다. 즉, 처리용량 범위내에서 외부에 유출없이 우수저류 및 침투가 가능한 경우 전량 처리되는 것으로 간주하는 방식이다. 연구결과로 제안한 LID 기법 적용에 대한 인증제도 마련과 유량개념의 처리효율 산정방안이 도입된다면, 보다 조속한 시일내 LID 기법의 확대 적용이 가능할 것이다.

• Journal of Plant Biotechnology
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• v.41 no.4
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• pp.169-179
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• 2014

Intracellular antioxidants include low molecular weight scavengers of oxidizing species, and enzymes which degrade superoxide and hydroperoxides. Such antioxidants systems prevent oxidative damage to cellular component by scavenging free radicals and activated oxygen species. Hydrophobic scavengers are found in cell membrane where they interrupt chain reactions of lipid peroxidation. The three major lipophilic antioxidant classes for human health are carotenoids, vitamin E and coenzyme Q10. The biofortification of staple crops with these lipid soluble antioxidants is an attractive strategy to increase the nutritional quality of human food. Here, we have summarized the biosynthetic pathways of three lipid soluble antioxidants in plants and current status of genetic engineered plants for elevated levels of each lipophilic antioxidant.

• Journal of Internet Computing and Services
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• v.16 no.5
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• pp.93-98
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• 2015

IoT (Internet of Things) is recently burgeoning as business applications as well as ICT itself. Among the business applications of IoT, wearable devices are recognized as a leading area of customer devices. This research first identifies customer needs of activity trackers (fitness trackers), as one of representative wearable devices, and mapping the identified needs with the well-known marketing model of marketing mix (4 P's: Product, Price, Promotion, and Place). Survey was applied to university students for identifying current and potential needs for activity trackers. The needs were classified by 4 P's, and according to the results, different from other IT devices, activity trackers has more potential needs. Moreover, reliable distribution channels, offline and company owned shops were preferred, rather than online shopping mall by third parties. The results would provide some valuable implications to not only designers of activity trackers but also business management.

• Journal of Korea Society of Industrial Information Systems
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• v.5 no.3
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• pp.111-116
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• 2000

There are many recent monitor manufacturing firms not equipped with automatic checking system in their final process. And the check is based on the human perception, so the automatic checking system is needed for the consistency and the accuracy of the checking process to elevate the productivity and the quality. As the performance of computer systems and the vision systems has been increased, the cost for the system is reduced and their applicable algorithms have been developed. In this study we develop monitor checking system which is low-cost, fast, and easy to adopt by the small-scaled manufacturing films. The system is based on the computer vision techniques, and is equipped with the GUI interface and checking functions such as centering, yoke rotation, pincushion, sizing, brightness, and grayscale tracking. Monitor checking system developed in this study can be used in the final checking process thereby we expect the synergy effects both on the efficiency of production and on the reduction of the cost for the facility investments.

• Journal of Energy Engineering
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• v.8 no.4
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• pp.605-611
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• 1999

Conventional methods for assessing remaining life of critical high temperature components in fossil power plants rely on nondestructive inspection practices and accompanying life analysis based on fracture mechanics By using these conventional methods. It has been difficult to perform uninterrupted in-service inspection for life prediction. Thus, efforts have been made for developing on-line remaining life monitoring systems employing information on the shape of structures, operating variables and material properties. In thus study, a software for on-line life monitoring system which performs real-time life evaluation of a high temperature system headers was developed. The software is capable of evaluating creep and fatigue life usage from the real-time stress data calculated by using temperatures/stress transfer Green functions derived in advance for the specific headers. The major benefits of the developed software life in determining future operating schedule, inspection interval, and replacement plan by monitoring real-time life usage based on prior operating history.

• Journal of KIISE:Databases
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• v.33 no.1
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• pp.129-137
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• 2006

An XML labeling scheme is an efficient encoding method to determine the ancestor-descendant relationships of elements and the orders of siblings. Recently, many dynamic XML documents have appeared in the Web Services and the AXML(the Active XML), so we need to manage them with a dynamic XML labeling scheme. The prime number labeling scheme is a representative scheme which supports dynamic XML documents. It determines the ancestor-descendant relationships between two elements with the feature of prime numbers. When a new element is inserted into the XML document using this scheme, it has an advantage that an assigning the label of new element don't change the label values of existing nodes. But it has to have additional expensive operations and data structure for maintaining the orders of siblings. In this paper, we suggest the order number sharing method and algorithms categorized by the insertion positions of new nodes. They greatly minimize the existing method's sibling order maintenance cost.

• The Journal of the Korea Contents Association
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• v.3 no.2
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• pp.87-95
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• 2003

Prompt and efficient information collection on each research area is emerging as the key factor of national technology competitiveness in industrialized society. Accordingly, constructing a variety of specialized DBs as the tool for supporting R&D activities and providing appropriate information are essential task to be solved in promoting R&D productivity. On this study, We have developed ceramics material property DB to support and facilitate R&D activities of industry, academia and research institutes. The ceramic property DB which was regarded as the most important DB surveyed from korean done for scientists and researchers was selected. To develop this DB, us have designed DB customized for domestic users after analyzing items and structures of ceramic material property information. We hope that R&D researchers can save time and cost in acquiring property information and the R&D productivity will be improved by utilizing our research result.

• The KIPS Transactions:PartA
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• v.9A no.2
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• pp.207-216
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• 2002

This paper present a design and implementation of a distributed audio, Video stream service framework based on CORBA for efficient processing and control of audio/video stream. We design software components which support processing, control and transmission of audio/video streams as distributed objects. For optimization of stream transmission performance, we separate the transmission path of control data and media data. Distributed objects are defined by IDL and implemented using JAVA. And device dependent facilities like media capturing, playing and communication channels are implemented using JMF (Java Media Framework) components. We show a connection establishment and control procedure of streams communication. And for evaluation, we implement a test system and experiment a system performance. Our experiments show that test system has somewhat longer connection latency time compared to TCP connection establishment, but has optimized media transmission time compared to CORBA IIOP. Also test system show acceptable service quality of media transmission.