• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권1호
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• pp.18-38
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• 2017

Infrastructure-as-a-Service (IaaS) clouds provide infrastructure as a pool of virtual resources, and the public IaaS clouds, e.g. Amazon Web Service (AWS) and private IaaS cloud toolkits, e.g. OpenStack, CloudStack, etc. provide their own application programming interfaces (APIs) for managing the cloud resources they offer. The heterogeneity of the APIs, however, makes it difficult to access and use the multiple cloud services concurrently and collectively. In this paper, we explore previous efforts to solve this problem and present our own implementation of an integrated cloud API, which can make it possible to access and use multiple clouds collectively in a uniform way. The implemented API provides a RESTful access and hides underlying cloud infrastructures from users or applications. We show the implementation details of the integrated API and performance evaluation of it comparing the proprietary APIs based on our cloud testbed. From the evaluation results, we could conclude that the overhead imposed by our interface is negligibly small and can be successfully used for multi-cloud access.

• 한국염색가공학회지
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• 제20권1호
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• pp.1-7
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• 2008

The study has attempted to introduce a new coating than the conventional standardized method of spray, padding and roll coating. The study has focused on finding condition for separating water and organic layer in marble bath and surface effects according to kind of raw hide. It was found that dyestuff-free was to be used in water layer and the input amount of initial insoluble pigment to be added in marble bath should be adjusted following the change of surface area of the marble bath in order to get efficient marble effect while preventing coagulation of water and organic layers. Eventually, amorphous high value-added leather could be obtained treated in process other than the conventional standardized method. Even raw hides of low grades($C{\sim}E$ grades) could be processed into amorphous marble effect that could conceal or shield surface scratches by the colorant, which eventually eliminated necessity of using excessive amount of chemicals in the coating process leading to achieving high quality marble leather of natural look.

• 한국의류학회지
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• 제41권6호
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• pp.994-1009
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• 2017

This study defines the concept of 'Effortless Chic' that continues to lead fashion world trends in a social climate not to bound by formalities that also consider changes in the term's meaning. Effortless Chic can be defined as behavior or fashion expressed in a refined, gracious manner, with skillfulness that does not show physical or mental efforts. Effortless Chic has the characteristics of being classic, fashionable and genderless, smartness which appropriately matches high-priced and low-priced brands, being eclectic between glamor and simplicity, or unconventional that also includes convenience, functionality, graciousness and softness. Active use of fabric with ease of care and use of design items capable of a variety of styling regardless of the season shows that effortless chic is receiving a strong attention thanks to the trend of eased TPO norm application. In conclusion, effortless chic shown in modern fashion does not mean an actual lack of endeavors as indicated by the word itself or low-priced fashion items, but can be seemed as another name for luxury represented by naturalness that hides the efforts.

• 디지털산업정보학회논문지
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• 제10권1호
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• pp.105-112
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• 2014

The utilization of Wireless Ad Hoc Network which can build easily network using wireless device in difficult situation to build network is very good. However, it has security threat element because it transfers data by only forwarding of wireless devices. The measures against this should be prepared because damage by especially routing attack can affect the entire network. It is hard to distinguish malicious node and normal node among nodes composing network and it is not easy also to detect routing attack and respond to this. In this paper, we propose new method which detect routing attack and can respond to this. The amount of traffic in all nodes is measured periodically to judge the presence or absence of attack node on the path set. The technique that hides inspection packet to suspected node and transmits is used in order to detect accurately attack node in the path occurred attack. The experiment is performed by comparing SRAODA and SEAODV technique to evaluate performance of the proposed technique and the excellent performance can be confirmed.

• Environmental Analysis Health and Toxicology
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• 제13권3_4호
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• pp.95-104
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• 1998

확률론적 해석방법은 환경독성물질에 의한 인체위해도 평가시 사용된 각 입력인자들의 불확실성까지 고려하는 방법론이다. 기존의 위해도 평가방법은 불확실성을 고려하지 않고 단순히 결과치의 포인트 값만을 제공하는데 비해 이러한 확률론적 해석방법은 입력인자들의 불확실성이 고려되고 결과치에 대한 이들의 중요도가 산출될 수 있는 등 더 많은 정보를 제공하므로써 환경위해도를 기반으로 한 환경정책 결정시 용이하게 사용될 수 있다. 본 논문은 현재 미국에서 음용수 기준설정시 논란이 많은 무기비소에 대해 확률론적 평가방법론을 적용하였다. 우선 인체위해도평가에 필요한 무기비소의 각종 자료들을 수집, 정리하고 이를 바탕으로 각 인자들의 불확실성을 계산하였다. 최종적으로 이들로부터 무기비소가 포함된 음용수를 마신 일반인의 피부암 위해도를 확률적으로 계산하였다. 또한 계산된 결과치와 여러 위해도기준치를 비교하여 정책결정에 필요한 의사결정에 대해서도 살펴보았다. 계산결과에 의하면 다수의 일반인들이 무기비소를 함유한 음용수섭취를 통해 현재 위해도설정치(10$^{-6}$)보다 높은 ] 피부암 위해를 입고 있는 것으로 나타나 이에 대한 규제가 필요하다고 본다.

• Asian Journal of Business Environment
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• 제6권4호
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• pp.5-12
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• 2016

Purpose - Not all firms are able to completely eliminate the risk arising out of the crisis. Success hides in the ability to perceive the market expectations accurately and take correct decisions. This study aims to analyze the firms' decisions at gross-root level. Research Design, Data, and Methodology - Primary data is obtained with the help of specially designed questionnaires from the agriproducts export firms that are members of export union of Turkey. The study is based on four theoretical structures: general planned behavior theory model, perception-leading behavior control and subjective norm model, perceived-behavioral-control leading perception and subjective norm models, and perceptions and subjective norms leading behavior control model. Structural Equation Models (SEM) is used to conduct the empirical analysis. Results - The findings show perceptions and subjective norms leading behavior control model as the best one, concluding that the environmental pressures and positive perceptions have significant effect on the strategic decisions of the agriproducts export firms. Conclusion - Policy tools like creating positive perception in the markets, providing sufficient information and financial support to the firms and increasing market competition can be used effectively to achieve the said objective.

• 한국컴퓨터그래픽스학회논문지
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• 제22권5호
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• pp.49-56
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• 2016

Oculus Rift, HTC Vive 등의 PC기반 Virtual Reality Head Mount Display 뿐 아니라, Google Cardboard, Samsung Gear VR등과 같은 모바일 VR HMD들이 출시 되고 있다. 그런데 HMD는 착용 시 사용자의 외부시야를 가리게 되므로 VR을 체험하는 공간의 실제 환경에 존재하는 각종 가구에 걸려 넘어지거나 벽 등의 위험요소들에 의해 사용자가 부딪혀 다치고 또는 가구 등이 파손 되는 상황이 일어날 수 있지만 아직 이것에 대해서 확실한 방안이 연구되어 있지 않은 상태이다. 본 논문에서는 Microsoft Kinect V1를 이용하여 사용자가 움직일 공간을 미리 3d Scanning하고 Minimap 방식으로 Scanning한 장애물의 위치 및 정보를 몰입감을 덜 저하시키면서 시각화하여 사용자에게 알려줌으로써 부상위험을 줄이는 방법으로 VR의 대중화를 돕는 방안을 제시 한다.

• 천문학회보
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• 제39권1호
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• pp.40.1-40.1
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• 2014

We have classified barred galaxies for 418 RC3 sample galaxies within z < 0.01 from SDSS DR7 using the visual inspection, ellipse fitting method and Fourier analysis. We found the bar fraction to be ~60%, 43% and 70% for each method and that the ellipse fitting method tends to miss the bar when a large bulge hides the transition from bar to disk in early spirals. We also confirmed that the Fourier analysis cannot distinguish between a bar and spiral arm structure. These systematic difficulties may have produced the long-time controversy about bar fraction dependence on Hubble sequence, mass and color. We designed a new method to fine bars by analyzing the ratio map of bar strength in polar coordinates, which yields the bar fraction of ~27% and ~32% for SAB and SB, respectively. The consistency with visual inspection reaches around 70%, and roughly 90% of visual strong bar are classified as SAB and SB in our classification. Although our method also has a weakness that a large bulge lowers the value of bar strength, the missing bar fraction in early spirals is reduced to the level of ~1/4 compared to the ellipse fitting method. Our method can make up for the demerits of the previous automatic classifications and provide a quantitative bar classification that agrees with visual classification.

• 정보보호학회논문지
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• 제26권5호
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• pp.1191-1199
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• 2016

논문 심사는 공정성을 확보하기 위하여 누가, 누구의 논문을 리뷰하는지 알 수 없도록 블라인드 리뷰를 시행한다. 하지만 일반적으로 논문은 저자의 연구 분야뿐만 아니라 저자가 자주 사용하는 단어, 어휘 등으로 이루어지기 때문에 저자의 정보를 숨기더라도 논문의 내용을 통해 저자를 파악할 수 있다. 본 논문에서는 저자 20명의 논문 315편을 수집하고 텍스트를 추출하여 데이터 정제 작업을 수행하였다. 그리고 정제 작업을 통해 추출된 단어를 추출해내어 인공신경망(artificial neural network)을 통한 분류를 진행함으로써 블라인드 리뷰(blind review)의 우회 가능성을 보였다. 실험을 통해 기존 블라인드 리뷰 시스템의 한계점을 보임으로써 향후 더욱 안전한 블라인드 리뷰 시스템의 필요성을 강조하였다.

• International Journal of Computer Science & Network Security
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• 제21권12호
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• pp.9-20
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• 2021

Abstraction applied in computer networking hides network details behind a well-defined representation by building a model that captures an essential aspect of the network system. Two current methods of representation are available, one based on graph theory, where a network node is reduced to a point in a graph, and the other the use of non-methodological iconic depictions such as human heads, walls, towers or computer racks. In this paper, we adopt an abstract representation methodology, the thinging machine (TM), proposed in software engineering to model computer networks. TM defines a single coherent network architecture and topology that is constituted from only five generic actions with two types of arrows. Without loss of generality, this paper applies TM to model the area of network monitoring in packet-mode transmission. Complex network documents are difficult to maintain and are not guaranteed to mirror actual situations. Network monitoring is constant monitoring for and alerting of malfunctions, failures, stoppages or suspicious activities in a network system. Current monitoring systems are built on ad hoc descriptions that lack systemization. The TM model of monitoring presents a theoretical foundation integrated with events and behavior descriptions. To investigate TM modeling's feasibility, we apply it to an existing computer network in a Kuwaiti enterprise to create an integrated network system that includes hardware, software and communication facilities. The final specifications point to TM modeling's viability in the computer networking field.