• Korean Journal of Remote Sensing
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• v.24 no.6
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• pp.613-620
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• 2008

Web on Web 2.0 paradigm is regarded as a kind of platform. Accordingly, users on web can use almost same applications like using certain applications on personal computer, to given purposes. For Web as platform, it needs web-based or web-recognizable file format to communicate or to exchange various information contents and data among applied applications. Text-based JSON is a practical format directly linked Javascript on Web, so that XML-typed data, being previously built, can be possible for tagging process containing JSON format. However, GeoJSON handling geo-spatial data sets is now fledgling stage in standards. Thus, it is not on the practical applicability level, and there are a few tools or open sources for this format. To adopt GeoJSON for the future Geo-web application, users implement GeoJSON parser or apply the server-based open source GIS for their purpose. In this study, a preliminary work for GeoJSON application in Geo-web service carried out using Google Maps API and openlayers library API.

• Journal of KIISE
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• v.43 no.7
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• pp.744-750
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• 2016

Recent cloud infrastructures provide competitive performances and operation costs for many internet services through pay-per-use model. Particularly, object storages are highlighted, as they have unlimited file holding capacity and allow users to access the stored files anytime and anywhere. Several lines of research are based on cloud-backed file systems, which support traditional POSIX interface rather than RESTful APIs via HTTP. However, these existing file systems handle all files with uniform size backing objects. Consequently, the accesses to cloud object storages are likely to be inefficient. In our research, files are profiled according to characteristics, and appropriate backing unit sizes are determined. We experimentally verify that different backing unit sizes for the object storage improve the performance of cloud-backed file systems. In our comparative experiments with S3QL, our prototype cloud-backed file system shows faster performance by 18.6% on average.

• The Journal of the Korea Contents Association
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• v.8 no.9
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• pp.84-93
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• 2008

Since 2005, the production of feature 3D animation has been growing up worldwide and technology of hardware and software has been advanced fully enough to get over the limitation of visual expression, so that rendering weight of the whole work process is getting more important. A final file in the state right before rendering increases. the data size gets bigger. Therefore, if such final file is rendered as it is, the production schedule may not be met. For, some needless time shall be spent to call and save a high-capacity file in amendment work and to execute the rendering entirely again in addition to amendment. In this study, Maya API [1]was used to study the efficient information amendment method of extracting the rendering layers' files in order to develop a tool that executes rendering by applying such method. As the result, compliance to production schedule that is important in animation production can be done through the independent rendering tool based layer rendering that can maximize the efficiency of amendment work.

• Journal of Advanced Navigation Technology
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• v.16 no.6
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• pp.968-974
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• 2012

After launched various smart devices such as smart phone and tablet PC, people who using smart devices are provided various services. Especially, contents sharing technology is utilized in any devices. But current contents sharing systems are made on various versions for various smart devices. These methods will be raising cost for development of application. Therefore it must using web technology for reducing cost. In this paper, we had analyzed performance of file transmission using web technology and compared with application based system.

• The Journal of Society for e-Business Studies
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• v.18 no.4
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• pp.45-65
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• 2013

A design file can get larger in size as the complexity of the target object increases. A large design file may reside in a large parallel computing system, such as cloud computing systems, and many designers may work concurrently on the same design file. In such a case, it is obvious that we need some kind of protection mechanism so that each user can access only the area of the file he or she is entitled to. Two approaches can be taken for this problem: one is the traditional access control mechanisms and the other encryption techniques. We take the latter approach to ensure the safety of the file even in public domain such as clouding systems, and in this paper, we suggest an encryption scheme for a file where the file is encrypted in multi-layer so that each user is allowed to access the file only at the layer for which the user has the proper access right. Each layer of the file is encrypted with different keys and these keys are exposed only to those who have the right access permit. The paper explains the necessary file format to achieve this goal and discusses the file manipulation functions to handle this new file format.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.385-387
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• 1999

내장형 기기에서 자바를 제어 및 응용 프로그램으로 사용하는 경향이 증대하고 있다. 내장형 자바가상머신에서는 응용 프로그램과 관련 자바 API를 로딩된 형태로 롬에 적재하는 형태를 가진다. 따라서 응용프로그램은 필터링을 거쳐서 관련된 자바 API를 선별한 후 롬릿으로 만들어진다. 본 논문에서는 내장형 자바가상머신에 적재될 롬릿을 만드는 과정에서 사용될 수 있는 프리레졸루션 방법을 제시하고 이를 위한 컨스턴트풀 데이터 구조를 제안하였다. 프리레졸루션은 롬릿을 만드는 과정에서 미리 레졸루션을 수행한 결과를 저장하여, 실행 시 발생되는 레졸루션 시간을 제거할 수 있도록 한다. 또한 프리레졸루션은 메모리 접근 횟수를 감소시켜 내장형 기기에서 필요한 저전력 요구를 지원한다. 본 논문에서 제안한 컨스턴트풀 데이터 구조는 공용체 구조의 미사용 부분에 레졸루션 결과를 저장할 수 있도록 구성함으로써 추가적인 메모리 비용없이 프리레졸루션의 이득을 얻을수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10c
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• pp.546-551
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• 2007

소프트웨어 버스마크는 프로그램을 식별하는데 사용될 수 있는 프로그램의 고유한 특징을 말한다. 본 논문에서는 windows PE(Portable Executable) 파일의 API에 대한 정보를 가지는 임포트 테이블에 기반한 프로그램 버스마킹 기법을 제안한다. 버스마크의 신뢰도를 높이기 위한 방법으로 대부분의 Windows 프로그램에서 사용되는 범용의 API는 버스마크에서 제외시키고 프로그램 개개의 특성을 나타낼 수 있는 특화된 API에 초점을 맞추어서 비교하는 방법을 사용한다. 본 논문에서 제안한 버스마킹 기법을 평가하기 위해서 다양한 카테고리의 Windows 프로그램에 대해서 실험을 하였다. 신뢰도를 측정하기 위해서 같은 프로그램에 대해서 버전별로 비교를 하였고, 프로그램의 분류에 따라서 유사한 카테고리와 다른 카테고리에 대해서 비교를 하였다. 프로그램의 변환이나 난독화에도 견딜 수 있는 강인도(Resilience)를 평가하기 위해서 서로 다른 컴파일러를 사용하여 생성된 프로그램에 대해서 비교를 하였다. 실험 결과에서 본 논문에서 제안하는 버스마크가 프로그램의 특징을 충분히 표현하고 있음을 보여준다.

• Korean Journal of Computational Design and Engineering
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• v.11 no.3
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• pp.164-171
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• 2006

As collaborative design and configuration design are of increasing importance in product development, it becomes essential to exchange the feature and parametric CAD models among participants. A history-based parametric method has been proposed and implemented. But each translator which exchanges the feature and parametric information tends to be heavy because to implement duplicated functions such as the identification of the selected geometries, mapping between features which have different attributes. Furthermore. because the history-based parametric translator uses the procedural model as the neutral format, which is the XML macro file, the history-based parametric translators need a geometric modeling kernel to generate an internal explicit geometric model. To ease the problem, we implemented a shared integration platform, the TransCAD. The TransCAD separates translators from the XML macro files. The translators for various CAD systems need to communicate with only the TransCAD. To support the communication with the TransCAD, we exposed the functions of the TransCAD by using the Automation APIs, which is developed by Microsoft. The Automation APIs of the TransCAD consist of the part modeling functions, the data extraction functions, and the utility functions. Each translator uses these functions to translate a parametric CAD model from the sending CAD system into the XML format, or from the in format into the model of the receiving CAD system This paper introduces what the TransCAD is and how it works for the exchange of the feature and parametric models.

• International journal of advanced smart convergence
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• v.8 no.2
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• pp.102-108
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• 2019

Big data was associated with three key concepts, volume, variety, and velocity. Securities and investment services produce and store a large data of text/numbers. They have also the most data per company on the average in the US. Gartner found that the demand for big data in finance was 25%, which was the highest. Therefore securities and investment companies produce the largest data such as text/numbers, and have the highest demand. And insurance companies and credit card companies are using big data more actively than banking companies in Korea. Researches on the use of big data in securities and investment companies have been found to be insignificant. We surveyed 22 major securities and investment companies in Korea for activating big data. We can see they actively use AI for investment recommend. As for big data of securities and investment companies, we studied open API. Of the major 22 securities and investment companies, only six securities and investment companies are offering open APIs. The user OS is 100% Windows, and the language used is mainly VB, C#, MFC, and Excel provided by Windows. There is a difficulty in real-time analysis and decision making since developers cannot receive data directly using Hadoop, the big data platform. Development manuals are mainly provided on the Web, and only three companies provide as files. The development documentation for the file format is more convenient than web type. In order to activate big data in the securities and investment fields, we found that they should support Linux, and Java, Python, easy-to-view development manuals, videos such as YouTube.

• KIPS Transactions on Computer and Communication Systems
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• v.3 no.10
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• pp.311-322
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• 2014

IoT(Internet of Things) is a concept of connected internet pursuing direct access to devices or sensors in fused environment of personal, industrial and public area. In IoT environment, it is possible to access realtime data, and the data format and topology of devices are diverse. Also, there are bidirectional communications between users and devices to control actuators in IoT. In this point, IoT is different from the conventional internet in which data are produced by human desktops and gathered in server systems by way of one-sided simple internet communications. For the cloud or portal service of IoT, there should be a file management framework supporting systematic naming service and unified data access interface encompassing the variety of IoT things. This paper implements a DB-based virtual file system maintaining attributes of IoT things in a UNIX-styled file system view. Users who logged in the virtual shell are able to explore IoT things by navigating the virtual file system, and able to access IoT things directly via UNIX-styled file I O APIs. The implemented virtual file system is lightweight and flexible because it maintains only directory structure and descriptors for the distributed IoT things. The result of a test for the virtual shell primitives such as mkdir() or chdir() shows the smooth functionality of the virtual file system, Also, the exploring performance of the file system is better than that of Window file system in case of adopting a simple directory cache mechanism.