• Proceedings of the Korean Information Science Society Conference
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• 2008.06b
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• pp.484-488
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• 2008

AHU(Autonomic Healing Utility)는 결함발생요인을 관리하고 결함이 발생할 가능성이 있는 응용프로그램을 검출하기 위하여 결함예방서비스와 더불어 프로액티브한 결함복구서비스를 지원한다. Server-Client 구조를 갖는 AHU는 하나의 AHU 서버에 너무 많은 AHU 클라이언트들이 자가치유 서비스를 요청하는 경우 병목현상이 발생하여 AHU 서버의 처리용량을 넘게 되고 AHU가 제공하는 자가치유시간을 증가시켜 자가치유서비스의 질을 저하시키거나 AHU의 SPOF(Single Point of Failure)로 작용하여 AHU의 전반적인 결함을 발생시키는 원인이 된다. 따라서 본 논문에서는 AHU 시스템의 부하를 분산시켜서 AHU 서버에 생기는 병목현상을 해소하기 위한 방법을 제안하고 이를 구현하여 기존의 AHU와 AHU 서버들 사이의 부하분산 방법을 적용한 AHU를 비교하는 성능평가를 수행하였다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.43 no.11 s.353
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• pp.69-76
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• 2006

This paper proposes a self-repair system which is able to self-repair in cell unit by imitating the structure of living beings. Because the data of artificial cells move even diagonally, our system can self-repair faults not in column unit, but in cell unit. It leads to design an efficient self-repair system for multiple faults. Moreover, in artificial cell design, the usage of logic-based design method has smaller system size than that of the previous register-based design method. Our experimental result for 2-bit up/down counter shows 40.3% reduction in hardware overhead, compared to the previous method [6].

• Rubber Technology
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• v.20 no.3
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• pp.143-152
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• 2019

• Korean Journal of Environment and Ecology
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• v.26 no.3
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• pp.463-471
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• 2012

Objective of this study is to provide basic information for developing more differentiated and targeted forest healing policy and Korean medical healing programs grounded on consumer preference for forest based Korean medical healing tourism products. The internet survey(CAWI) by percentage quota sampling with 400 Seoulite ages over 30 by the age, area, and gender was conducted, and 317 samples were used for a final analysis. 61.5% of the Seoulite associated 'forest bath/walking in the woods/tree' with an image of a forest based Korean medical healing tourism product, and preference for the product and the intention to use were positive at the percentages of 72.9% and 67.5%, respectively. Preferred areas were Seoul/Gyeonggi-do(53.5%) and Gangwon-do(38.8%). 'Stress solving and refreshment', 'taking a forest bath and a walk', and 'maintaining and promoting health' were the main purposes of the use. As for a therapy, 'walking therapy' was most preferred, and 'ergotherapy' was the next. First priority as for a use facility was 'healing trail', and 'professional medical facility' ranked second. Although important decision attributes were ' cost of use', 'food', and 'friendliness of medical staff', all the other sets of attributes related to use convenience, quality of medical service and tourism activities also recorded high, which forecasts higher consumer expectation for the product. As the result showing differences in consumer preference by the demographic segmentation, differentiated and segmented consumer needs should be considered when planing and managing a product. The scope of the study is limited to a demographic segmentation which is a basic stage of understanding consumer preference, therefore more detailed future researches on complicated and multi-dimensional consumer needs are required.

• Journal of the Korea Concrete Institute
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• v.21 no.4
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• pp.409-417
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• 2009

In this study, autogenous crack healing and artificial crack healing using electrochemical electro deposition method were conducted to compare in the aspects of corrosion monitoring. Furthermore, the analysis of impressed voltage characteristics, galvanic current and linear polarization resistance comparison, and photo image processing technique were performed for quantitative comparisons of healing ratio. As a result, it was found that, in view of impressed voltage of artificial crack healing, the measured voltage was increased as time goes by. From the galvanic test results of artificial crack healing, the current vs. potential distribution value were formed widely in comparison with autogenous crack healing. In this point, it was shown that artificial crack healing has more eleatic resistance capacity than autogenous crack healing technique. Finally, it was found that artificial crack healing was 1.63 times higher than autogenous healing in view of crack healing ratio.

• Polymer Science and Technology
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• v.25 no.2
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• pp.128-134
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• 2014

• Journal of the Korean Institute of Landscape Architecture
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• v.41 no.4
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• pp.68-76
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• 2013

Effortful directed attention becomes fatigued if it is demanded by environment. Kaplan and Kaplan's Attention Restoration Theory (ART) proposes that the fatigued directed attention can be restored by a restorative landscape. The four restorative components are being away, fascination, extent, and compatibility. The restorative effect of landscape has been mainly investigated in terms of nature vs. urban dichotomy, although ART acknowledges that various types of landscapes can induce restorative effect. The purpose of this study is to examine whether sense of place of landscape has an influence on the restorative effect, and how the effect relates to the visiting experience. This study was performed in An-Ap-Ji with 200 Korean visitors who participated in the questionnaire survey. Hartig et al.'s PRS (Perceived Restorativeness Scale) was used as the research instrument to measure the restorative quality. The Analysis results are summarized as: 1) PRS was a very reliable measurement for Koreans' assessment of traditional landscape. Especially, the factor analysis produced four restorative components which fully supported ART. 2) The sense of place of landscape was found to have a positive influence on the restorative effect. 3) Landscape beauty was also discovered to be influential in the restoration even though the effect of beauty was lower than that of the sense of place. 4) Among the four restorative components, three components (fascination, escape, compatibility) influenced both visiting satisfaction and revisit intention, where the order of the relevant importance was fascination, escape, and compatibility. Based on the results, it was suggested that PRS should be used in landscape restoration research in Korea in order to re-examine its' reliability. It was also proposed that more research should be directed to investigate the relationship between the sense of place and the restorative effect of landscape.

• Clean Technology
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• v.17 no.1
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• pp.1-12
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• 2011

Scientists and engineers have altered the properties of materials such as metals, alloys, polymers, ceramics, and so on, to suit the ever changing needs of our society. Man-made engineering materials generally demonstrate excellent mechanical properties, which often tar exceed those of natural materials. However, all such engineering materials lack the ability of self-healing, i.e. the ability to remove or neutralize microcracks without intentional human interaction. The damage management paradigm observed in nature can be reproduced successfully in man-made engineering materials, provided the intrinsic character of the various types of engineering materials is taken into account. Various self-healing ptotocols that can be applied for the organic materials such as polymers, ionomers and composites can be developed by utilizing suitable chemical reactions and physical intermolecular interactions.

• Journal of KIISE:Computer Systems and Theory
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• v.32 no.7
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• pp.333-340
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• 2005

One of the most important core technologies required for the design of the ITS (Intrusion Tolerance System) that performs continuously minimal essential services even when the network-based computer system is partially compromised because of the external or internal intrusions is the quantitative dependability analysis of the ITS. In this paper, we applied self-healing mechanism, the core technology of autonomic computing to secure the protection power of the ITS. We analyzed a state transition diagram of the ITS composed of a Primary server and a backup server utilizing two factors of self-healing mechanism (fault model and system response) and calculated the availability of ITS through simulation experiments and also performed studies on two cases of vulnerability attack.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.419-422
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• 2007

오늘날 컴퓨팅 환경은 점차 복잡해지고 있으며, 복잡한 환경을 관리하기 위해 많은 노력을 하고 있다. 이러한 관리를 좀 더 효율적으로 하기 위하여 환경에 스스로 적응하는 자가 치유에 관한 연구가 중요한 이슈가 되고 있다. 이러한 자가 치유를 하기 위해서는 추가적으로 리소스를 더 사용하게 된다. 우리의 이전 연구에서는 이러한 자가 적응 모듈이 사용하는 리소스를 줄여 성능을 향상시키고자 스위치를 이용하여 자가 적응 컴포넌트의 동작을 조절하는 방법을 제안하였다. 그러나 이러한 방법론은 자가 적응 모듈의 동작을 제어하기 위한 추상화(abstraction) 기법을 제공하지는 않는다. 또한 자가 적응모듈을 설계할 때 개발자가 이 방법론을 적용하기 위한 코드를 직접 작성해야 한다. 본 연구에서는 이전 연구를 확장하여 1) 목표 그래프를 통해 자가 적응 모듈의 동작 단계를 분석하고 2) 기술된 단계를 이용하여 단계별 동작 스위치를 자동 생성한다. 이러한 방법론을 통하여 자가 적응을 위해 추가로 사용해야 하는 리소스의 사용을 줄일 수 있으며, 개발자가 자가 적응 모듈의 성능 개선을 위한 코드를 작성하는 수고를 덜 수 있다. 본 논문에서는 평가를 위하여 비디오 회의 시스템 내의 파일 전송 모듈의 목표 그래프를 작성하였다. 이 목표 그래프를 기반으로 자가 적응 모듈의 성능을 개선할 수 있는 동작 스위치의 템플릿 코드를 생성한다. 이러한 과정을 통해 생성된 코드를 자가 적응 모듈에 적용하여 스위치가 제대로 동작함을 확인한다. 또한 동작 스위치를 적용하기 전과 적용한 후의 동시 동작 컴포넌트 수를 비교한다. 이를 통해 목표 그래프를 기반으로 생성된 코드가 자가 적응 모듈의 성능을 향상시킬 수 있음을 확인할 수 있었다.