• 한국멀티미디어학회논문지
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• 제7권8호
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• pp.1145-1161
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• 2004

본 연구는 인터넷에 분산되어 있는 언어자원들의 미디어 데이터를 통합하여 멀티미디어 전자사전 시스템을 구축하는 기법을 연구하는 것으로, 텍스트 데이터를 기반으로 한 기존 전자사전 시스템을 멀티미디어 환경으로 발전시킨다. 이를 위하여 인터넷에 분산되어 있는 언어자원들의 미디어 데이터를 웹 브라우저 환경에서 통합하는 기법을 제안한다. 제안하는 기법은 미디어 통합데이터에 의해 웹 브라우저가 모든 작업을 수행하므로 복잡한 서버 시스템을 필요로 하지 않는다. 구현하는 전자사전은 웹 브라우저 환경에서 작동하며, 텍스트와 이미지 및 음성을 통합하여 합성하거나 움직임을 재생한다. 통합과 움직임의 데이터를 기술하기 위하여 각 미디어의 의미를 분석하여 SMIL 문서를 생성하고 웹 브라우저에서 실행하도록 하였다. 제안하는 멀티미디어 전자사전 시스템은 단순한 미디어 데이터들을 통합하는 방식으로 작동하므로 전용 서버 시스템을 필요로 하지 않는다. 또한, 각 미디어 데이터는 분산되어 있는 데이터를 공유하는 형태이므로 저장 공간을 절약하게 되며, 최근의 데이터로 갱신하는 것이 간단하게 이루어진다.

• 한국정보통신학회논문지
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• 제20권8호
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• pp.1466-1477
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• 2016

공인인증서의 원리 기술인 공개키 기반 구조는 인터넷 환경에서 본인확인, 부인 방지, 문서의 위변조 방지 등의 기능을 제공하는 보안기술이다. 국내 정부기관 및 금융기관들은 인터넷 서비스의 보안 사고 방지를 위해 ActiveX를 이용한 PKI인증시스템을 사용하고 있다. 그러나 ActiveX와 같은 플러그인 기술은 보안에 취약할 뿐만 아니라 특정 브라우저에서만 사용가능하기 때문에 사용자에게 불편함을 초래한다. 이러한 문제점을 해결하기 위해 웹 표준(HTML5) 기반의 인증 기술 연구가 활발하게 진행되고 있다. 최근 국내은행에서 최초로 웹 표준 기반의 PKI인증 기술을 도입하였다. 하지만 채택된 방법은 웹 스토리지의 동일 출처 정책으로 인해 각 사이트마다 인증서를 등록해야 하는 불편함이 있다. 본 논문에서는 동일 출처 정책의 단점을 해결하면서 웹 표준을 준수하는 인증서 기반 통합 인증 프로토콜을 제안하고 안전성을 증명한다.

• 정보처리학회논문지B
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• 제9B권5호
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• pp.533-540
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• 2002

인터넷 전자상거래의 발달로 데스크 탑 컴퓨터만이 아니라 냉장고, 달리는 차 안, PDA 휴대 전화 등 생활 영역 곳곳에서도 전자상거래를 할 수 있다. 다양한 기기들에서 전자상거래를 하기 위해 쇼핑몰들은 여러 화질의 이미지를 제공해야 한다. 현재의 전자상거래 시스템을 같은 상품 이미지라도 쇼핑몰들이 각각 저장하고 있다. 웹 이미지 서버는 쇼핑몰이 더 이상 이미지를 저장하지 않도록 이미지를 제공하는 중앙 집중적인 이미지 저장소이다. 따라서, 웹 이미지 서버를 이용하면 여러 쇼핑몰의 저장공간을 간편화할 수 있다. 또한, 이미지를 효율적으로 사용할 수 있고 쇼핑몰의 이미지의 갱신과 관리가 쉽게 이루어질 수 있다. 본 논문에서는 기존에 구현된 웹 이미지 서버를 쇼핑몰 관리 기능, 사용자 로그 기록 기능과 이미지 카탈로그 기능을 추가하여 확장하였고, 웹 서버 성능 평가 툴인 WAS를 이용하여 웹 이미지 서버 시스템의 응답시간을 측정하여 비교하였고, 사용자를 계속 증가시켜 웹 이미지 서버의 안전성을 평가하였다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제22권6호
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• pp.94-103
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• 2017

Surface soil is one of the most important resources that have many functions for human needs such as conservation of water resource, purification of contaminated materials, and productivity of food or energy. However, the surface soil is a limited resource that cannot be recovered readily for a long time once it is lost by erosion. In Korea, the Ministry of Environment enacted the notification on the investigation of surface soil erosion and corresponding countermeasures. As the results, database of soil quality assess criteria (biomass, groundwater recharge, habitat, carbon storage, buffer, and soil loss) was established, and the web-based system that can evaluate surface soil conditions was developed. However, non-experts have difficulties in using the system because the system requires in-depth knowledge about soil qualities. In this study, the Web Geographic Information System (GIS) watershed-based surface soil information system was developed to improve usability of the system and accessibility of soil quaility database. The system provides the current condition of surface soil characteristics and GIS-based soil data at selected locations. The users are able to download soil quality data in different districts, watersheds, and special regions allocated by TauDEM module. The system developed in this study would valuable surface soil information for studies of soil quality and its environmental effects, and thereby contributing to establishing more appropriate and robust soil conservation laws.

• 한국멀티미디어학회논문지
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• 제19권2호
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• pp.308-315
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• 2016

With the advancement in the area of cloud storage services as well as a tremendous growth of social networking sites, permission for one web service to act on the behalf of another has become increasingly vital as social Internet services such as blogs, photo sharing, and social networks. With this increased cross-site media sharing, there is a upscale of security implications and hence the need to formulate security protocols and considerations. Recently, OAuth, a new protocol for establishing identity management standards across services, is provided as an alternative way to share the user names and passwords, and expose personal information to attacks against on-line data and identities. Moreover, OwnCloud provides an enterprise file synchronizing and sharing that is hosted on user's data center, on user's servers, using user's storage. We propose a secure Social Networking Site (SSN) access based on OAuth implementation by combining two novel concepts of OAuth and OwnCloud. Security analysis and performance evaluation are given to validate the proposed scheme.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2011년도 추계학술발표대회
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• pp.1.1-1.1
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• 2011

Electrospinning has known to be very effective tool for production of versatile one-dimensional (1D) nanostructured materials such as nanofibers, nanorod, and nanotubes and for easily assembly to two-, three-dimensional(2D, 3D) nanostructures such as thin film, membrane, and nonwoven web, etc. We have studied on the electrospinning technology for novel energy storage and conversion materials such as advanced separator, dye sensitized solar cell, supercapacitor, etc. High heat-resistive nanofibrous membrane as a new separator for future lithium ion polymer battery was prepared by electrospinning of PVdF based composite solution. The novel nanofibrous composite nonwovens have tensile strength of above 50 MPa and modulus of above 1.3 GPa. The internal structure of the electrospun composite nanofiber with a diameter of few hundreds nanometer were composed of core-shell nanostructure. And also electrospun $TiO_2$ nanorod/nanosphere based dye-sensitized solar cells with high efficiency are successfully prepared. Some battery performance will be introduced.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2006년도 전력전자학술대회 논문집
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• pp.462-464
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• 2006

본 연구는 제4세대 미터링(Metering) 기술을 이용한 전력전자상거래 즉 VSEM(Value Storage Electricity Meter)을 위한 웹기반 미터링 시스템의 보안성 분석 및 평가에 관한 연구이다. 특히 수요자 측면에서 스마트카드(지불결제)를 이용한 본인 확인(SIM카드), 키 값 확인, VSEM서버에서의 각 수요자와 공급자 데이터 사이의 무결성 확인(Integrity)과 부인 방지(Non-repudiation)를 위한 기존 시스템의 보안 문제를 분석하고 이를 해결할 수 있는 보안 모델을 제안한다.

• 전기학회논문지
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• 제65권12호
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• pp.2119-2126
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• 2016

In this paper, we developed a smart black box that can monitor and record the information of the sensor from subsystem in the smart grid system. The plant is the complex power system which is integrated by solar power system, grid-connected power systems, and BESS(battery energy storage system). The black box with the web-server application can connect and synchronize to an external monitoring system and a smart phone. We hope that this system is to contribute to improve operational efficiency, reliability, and stability for the smart grid power system.

• Journal of Computing Science and Engineering
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• 제11권3호
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• pp.92-99
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• 2017

Memcached, commonly used to speed up the data access in big-data and Internet-web applications, is a system software of the distributed-cache mechanism. But it is subject to the severe challenge of the loss of recently uncommitted updates in the case where the Memcached servers crash due to some reason. Although the replica scheme and the disk-log-based replay mechanism have been proposed to overcome this problem, they generate either the overhead of the replica synchronization or the persistent-storage overhead that is caused by flushing related logs. This paper proposes a scheme of backing up the write requests (i.e., set and add) on the Memcached client side, to reduce the overhead resulting from the making of disk-log records or performing the replica consistency. If the Memcached server fails, a timestamp-based recovery mechanism is then introduced to replay the write requests (buffered by relevant clients), for regaining the lost-data updates on the rebooted Memcached server, thereby meeting the data-consistency requirement. More importantly, compared with the mechanism of logging the write requests to the persistent storage of the master server and the server-replication scheme, the newly proposed approach of backing up the logs on the client side can greatly decrease the time overhead by up to 116.8% when processing the write workloads.

• Archives of Plastic Surgery
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• 제48권3호
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• pp.295-304
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• 2021

Clinical photography is an essential component of patient care in plastic surgery. The use of unsecured smartphone cameras, digital cameras, social media, instant messaging, and commercially available cloud-based storage devices threatens patients' data safety. This paper Identifies potential risks of clinical photography and heightens awareness of safe clinical photography. Specifically, we evaluated existing risk-mitigation strategies globally, comparing them to industry standards in similar settings, and formulated a framework for developing a risk-mitigation plan for avoiding data breaches by identifying the safest methods of picture taking, transfer to storage, retrieval, and use, both within and outside the organization. Since threats evolve constantly, the framework must evolve too. Based on a literature search of both PubMed and the web (via Google) with key phrases and child terms (for PubMed), the risks and consequences of data breaches in individual processes in clinical photography are identified. Current clinical-photography practices are described. Lastly, we evaluate current risk mitigation strategies for clinical photography by examining guidelines from professional organizations, governmental agencies, and non-healthcare industries. Combining lessons learned from the steps above into a comprehensive framework that could contribute to national/international guidelines on safe clinical photography, we provide recommendations for best practice guidelines. It is imperative that best practice guidelines for the simple, safe, and secure capture, transfer, storage, and retrieval of clinical photographs be co-developed through cooperative efforts between providers, hospital administrators, clinical informaticians, IT governance structures, and national professional organizations. This would significantly safeguard patient data security and provide the privacy that patients deserve and expect.