• Journal of Broadcast Engineering
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• v.24 no.3
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• pp.420-429
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• 2019

Recently, researches using Convolutional Neural Network (CNN)-based approaches have been actively conducted to improve the reduced quality of compressed video using block-based video coding standards such as H.265/HEVC. This paper aims to summarize and analyze the network models in these quality enhancement studies. At first the detailed components of CNN for quality enhancement are overviewed and then we summarize prior studies in the image domain. Next, related studies are summarized in three aspects of network structure, dataset, and training methods, and present representative models implementation and experimental results for performance comparison.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.12 no.2
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• pp.77-87
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• 2002

In the field of secure information systems including electronic commercials, public key infrastructure(PKI) is widely used for secure services. The more PKI domains are established, the more needs we required for cross-domain certifications. Furthermore, each country has many certificate authorities(CA) which requires more complex cross certification. We may need a fast algorithm in order to fad the possible certification paths. This will be more indispensible in the growing PKI systems. Thus, in this paper we design a high-speed certification path discovery algorithm and implement it. Also we investigate the feature of operation of the system.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.195-199
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• 2009

NoC 시스템은 기본적으로 서로 다른 클럭 도메인에서 동작하는 여러 버스 시스템들이 NoC를 통해서 연결되는 것으로 간주할 수 있다. NoC에 다른 버스 인터페이스 IP를 부착하려면 별도의 래퍼를 사용해야 하며, 면적과 지연시간이 추가되는 것이 일반적이다. 본 논문에서는, 추가적인 래퍼의 필요성을 제거하기 위하여, 주어진 버스 인터페이스에 맞는 인터페이스 에이전트 또는 네트워크 인터페이스를 자동 생성하는 방법을 제안한다. 이를 위하여, 한가지 NoC 시스템을 위해 표준적인 패킷 포맷을 정의하였으며, 거기에는 패킷에 대한 라우팅 정보 뿐 아니라, 여러 종류의 버스 프로토콜의 데이터, 주소, 제어 정보도 포함될 수 있도록 정의되었다. 그리고, 인터페이스 에이전트는 표준 패킷 포맷과 특정 버스 인터페이스 프로토콜 간의 변환 작업을 수행한다. 실험을 통해서, PVCI, WISHBONE, AHB, OCP와 같은 몇 가지 버스 인터페이스에 대해 자동생성된 네트워크 인터페이스들 간에, 표준 패킷 포맷을 이용한 데이터 통신이 중요 정보의 손실 없이 잘 이루어짐을 보인다.

• Annual Conference on Human and Language Technology
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• 2023.10a
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• pp.409-414
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• 2023

최근 지식 기반 대화 생성에 많은 연구자가 초점을 맞추고 있다. 특히, 특정 도메인에서의 작업 지향형 대화 시스템을 구축하는 것은 다양한 도전 과제가 있으며, 이 중 하나는 거대 언어 모델이 입력과 관련된 지식을 활용하여 응답을 생성하는 데 있다. 하지만 현재 거대 언어 모델은 작업 지향형 대화에서 단순히 정보를 열거하는 방식으로 응답을 생성하는 경향이 있다. 이 논문에서는 전문 지식과 대화 정책 예측 모델을 결합한 프롬프트를 제시하고 작업 지향형 대화에서 사용자의 최근 입력에 대한 정보 제공 및 일상 대화를 지원하는 가능성을 탐구한다. 이러한 새로운 접근법은 모델 파인튜닝에 비해 비용 측면에서 효율적이며, 향후 대화 생성 분야에서 발전 가능성을 제시한다.

• Journal of the Korea Society for Simulation
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• v.19 no.4
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• pp.179-188
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• 2010

The concern of Software Product Line(SPL) engineering is spreading widely because the program or product developers are able to satisfy the customer's demands quickly and give a way to handle maintenance efficiently. SPL is a reuse paradigm that reuse common parts and adopts variable parts optionally to form a differentiated product by analyzing domains. Purposes of this paper are to design an architecture which has a dynamic reconfiguration function and to develop basic components which are the basic unit of reconfiguration to raise the reuse level of the guided weapon system using the SPL. Initially we design an architecture and define basic components for developing a dynamic reconfigurable components based on SPL. Then we develop the composer for physical components and behavior components referenced by behavior models of OneSAF.

• KIPS Transactions on Software and Data Engineering
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• v.4 no.6
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• pp.247-252
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• 2015

As software has gotten bigger in magnitude and the complexity of software has been increased, the maintenance has gained in-creasing attention for its significant impact on the cost. Identifiers have an impact on more than 90 percent of the readability which accounts for a majority portion of the maintenance activities. For this reason, the existing works focus on domain-specific features based on identifiers. However, their approaches have a limitation when either a class name does not reflect the intention of its context or a class naming is incorrect. Therefore, this paper suggests a series of class name validation process by extracting properties of classes, building learning model by applying a decision tree technique of machine learning, and generating a validation report containing the list of recommendable postfixes of classes to be validated. To evaluate this, four open source projects are selected and indicators such as precision, recall, and ROC curve present the value of this work when it comes to five specific postfixes including functional information on class names.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.1
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• pp.25-34
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• 2010

The IEEE 802.16-2004 standard has a security sub-layer in the MAC layer called, Privacy Key Management (PKM). However, several researches have been published to address the security vulnerabilities of IEEE 802.16-2004. After the IEEE 802.16-2004 standard, a new advanced and revised standard was released as the IEEE 802.16e-2005 amendment which is foundation of Mobile WiMAX network supporting handoffs and roaming capabilities. PKMv2 in Mobile WiMAX includes EAP authentication, AES-based authenticated encryption, and CMAC or HMAC message protection. However, Mobile WiMAX still has a problem of security architecture such as a disclosure of security context in network entry, a lack of secure communication in network domain, and a necessity of efficient handover supporting mutual authentication because Mobile WiMAX security has mainly concentrated on between SS and BS communication. Based on the investigation results, we propose a novel mobile WiMAX security architecture, called RObust and Secure MobilE WiMAX (ROSMEX), to prevent the new security vulnerabilities.

• Journal of the Korean Society for information Management
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• v.28 no.2
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• pp.37-51
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• 2011

The domain of digital libraries is one of interdisciplinary fields since it contains various aspects of digital libraries. The main findings of digital library interdisciplinarity have been discussed in terms of contents, management and infrastructural technologies within the field of library and information science. The purpose of this study is to identify and widen the interdisciplinary structure of digital library domain by analyzing the collaborations from different disciplines. With 1,394 research articles of digital libraries from 1997 to 2010, the analysis of collaborations of authors from various disciplines was conducted. The results identified that three subject areas of authors such as Information science and library science, Computer science and Engineering were found as the centers to collaborate with various disciplines. In addition, sub-domains of digital library were recognized in terms of core digital library area, natural science area, medical related area and biology and medical area. The findings of this study depict the domain of digital libraries as a variety of subject areas since digital library domain is characterized with both research and practices.

• KIPS Transactions on Software and Data Engineering
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• v.4 no.3
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• pp.121-128
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• 2015

A given product's online product reviews build up to form largely positive or negative reviews or mixed reviews that include both the positive and negative reviews. While the homogeneously positive or negative reviews help readers identify the generally praised or criticized product, the mixed reviews with minority opinions potentially contain valuable information about the product. We present a method of retrieving minority opinions from the online product reviews using the skewness of positive/negative reviews. The proposed method first classifies the positive/negative product reviews using a sentiment dictionary and then calculates the skewness of the classified results to identify minority reviews. Minority review retrieval experiments were conducted on smartphone and movie reviews, and the F1-measures were 24.6% (smartphone) and 15.9% (movie) and the accuracies were 56.8% and 46.8% when the individual reviews' sentiment classification accuracies were 85.3% and 78.8%. The theoretical performance of minority review retrieval is also discussed.

• KIPS Transactions on Software and Data Engineering
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• v.2 no.7
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• pp.443-450
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• 2013

The high portability and mobility of mobile devices have given rise to critical concerns with regard to mobile situation-aware services that utilize user situation information in the mobile domain. Mobile situation-aware services for mobile devices are provided by collecting and analyzing data, from which the user situation is inferred through an inference system. However, the high mobility of the mobile domain has made it difficult to infer the required results. In addition, previous studies have not identified a systematic approach to modifying and adapting. In this paper, we propose a systematic feedback process model based on software cybernetics in order to address the abovementioned problems. Further, we propose a MADA(Monitoring, Analysis, Determinating, Adaptation) framework for the feedback process model. Thus, the proposed approach supports the development of self-adaptive mobile situation-aware services that can infer appropriate results and manage the inferred results systematically.