• 정보보호학회논문지
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• 제27권3호
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• pp.531-539
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• 2017

CAPTCHA는 인터넷에서 서비스 혹은 자원을 요청하는 존재가 사람인지 아닌지를 구별하기 위한 테스트 기법이다. 이러한 대부분의 CAPTCHA들은 CAPTCHA 영상을 제3자에게 스트리밍 하여 제 3자가 사용자 대신 CAPTCHA에 응답하는 스트림 릴레이 공격에 의해 우회 될 수 있다는 문제점을 갖는다. 스트림 릴레이 공격에 저항성을 갖기 위해 인간의 인지 구조를 이용한 Emerging Image Game CAPTCHA가 제안되었으나, 사용성이 낮다는 문제점이 있다. 본 연구에서는 Emerging Image Game CAPTCHA의 사용성을 개선할 수 있는 Emerging Image Cue CAPTCHA 설계 방법과 CAPTCHA를 제안하며, 제안된 CAPTCHA에 대한 사용성 평가, 릴레이 공격 시뮬레이션을 통해 실질적인 개선이 이루어졌는지를 평가한다.

• International Journal of Computer Science & Network Security
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• 제23권8호
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• pp.49-62
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• 2023

There has been a rapid increase in the creation and alteration of new malware samples which is a huge financial risk for many organizations. There is a huge demand for improvement in classification and detection mechanisms available today, as some of the old strategies like classification using mac learning algorithms were proved to be useful but cannot perform well in the scalable auto feature extraction scenario. To overcome this there must be a mechanism to automatically analyze malware based on the automatic feature extraction process. For this purpose, the dynamic analysis of real malware executable files has been done to extract useful features like API call sequence and opcode sequence. The use of different hashing techniques has been analyzed to further generate images and convert them into image representable form which will allow us to use more advanced classification approaches to classify huge amounts of images using deep learning approaches. The use of deep learning algorithms like convolutional neural networks enables the classification of malware by converting it into images. These images when fed into the CNN after being converted into the grayscale image will perform comparatively well in case of dynamic changes in malware code as image samples will be changed by few pixels when classified based on a greyscale image. In this work, we used VGG-16 architecture of CNN for experimentation.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권3호
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• pp.1051-1077
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• 2021

The secure communication of information is a major concern over the internet. The information must be protected before transmitting over a communication channel to avoid security violations. In this paper, a new hybrid method called compressed encrypted data embedding (CEDE) is proposed. In CEDE, the secret information is first compressed with Lempel Ziv Welch (LZW) compression algorithm. Then, the compressed secret information is encrypted using the Advanced Encryption Standard (AES) symmetric block cipher. In the last step, the encrypted information is embedded into an image of size 512 × 512 pixels by using image steganography. In the steganographic technique, the compressed and encrypted secret data bits are divided into pairs of two bits and pixels of the cover image are also arranged in four pairs. The four pairs of secret data are compared with the respective four pairs of each cover pixel which leads to sixteen possibilities of matching in between secret data pairs and pairs of cover pixels. The least significant bits (LSBs) of current and imminent pixels are modified according to the matching case number. The proposed technique provides double-folded security and the results show that stego image carries a high capacity of secret data with adequate peak signal to noise ratio (PSNR) and lower mean square error (MSE) when compared with existing methods in the literature.

• 아태비즈니스연구
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• 제9권2호
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• pp.39-57
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• 2018

As competition grows in the telecommunication service industry, understanding the origins of brand image and consumer behavioral intentions challenges practitioners to design an effective marketing strategy and branding plan. In this paper, brand image and behavioral relationships are investigated in Bangladesh, an emerging market that has a particular socio-cultural and economic context of one of the most densely populated countries of South Asia. This study employs confirmatory factor analysis and structural equation modeling to analyze the database. Empirical testing and the proposed model suggest that brand image is the prime determinant of consumer satisfaction and loyalty. The results highlight the importance of perceived value, perceived trust and price structure to project brand image and satisfaction. Additionally, confirmation exhibits a stronger total effect of brand image on customer loyalty. Empirical findings extensively contribute to the theoretical and managerial understanding of subscribers' attitudes toward telecommunication service in an emerging market context.

• 유통과학연구
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• 제8권1호
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• pp.43-52
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• 2010

본 연구는 중국에서 중요한 소비 계층으로 급성장하고 있는 중국 대도시의 대학생들을 대상으로 경제발전, 교육수준, 제품품질, 기술연구, 생활수준, 민주체제의 요소로 국가이미지를 측정하여 일본과 한국의 국가이미지가 중국 소비자의 식품, 의류패션, 생활용품, 음악제품, 자동차, 가전제품의 구매의향에 미치는 영향의 차이를 비교 분석하였다. 실증분석 결과 국가이미지가 중국 소비자들의 제품별 구매의향에 영향을 미치는 것으로 나타났으며, 전자제품을 제외한 식품, 생활용품, 의류패션, 음악제품, 자동차 구매시 한국의 국가이미지가 중국 소비자들의 구매의향에 미치는 영향은 일본보다 다소 작은 것으로 나타났다. 조사대상 표본 구성의 한계로 인해 본 연구의 일반화에는 주의가 필요하나 국가이미지의 각 구성요소가 제품구매에 영향을 미치고 있음을 발견하여 국가 차원에서의 국가이미지 구축 전략의 필요성을 확인하고, 또 각 기업들이 자체적으로 중국시장에서의 브랜드인지도를 높이기 위해 노력해야 한다는 점을 시사하고 있다는 점에서 본 연구는 의의가 있다고 할 수 있다.

• 유통과학연구
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• 제11권7호
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• pp.47-56
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• 2013

Purpose - In the academic literature, the researches on a comparative study on purchase behaviors of the consumers from emerging and mature markets remain limited. Therefore, this empirical study is attempted to examine the effects of country of origin (COO), brand image and corporate image on the purchase behavior of Chinese consumers (as from emerging market) and Korean consumers (as from mature market). Research Design, data, methodology - In total, 615 valid questionnaires were collected from the main cities of China and Korea respectively, and a multiple group analysis was conducted to test the hypotheses with SPSS 16.0 and AMOS18.0. Results - Chinese consumers are not influenced by country-of-origin effect, whereas Korean consumers are sensitive to it. Both Chinese and Korean consumers are sensitive to brand image, whereas corporate image does appear to influence Chinese consumers but not Korean consumers. The effects of country-of-origin are not more influential in less developed market (China) than more developed market (Korea). Conclusions - According to the results of this empirical study, the country-of-origin effect does impact Korean consumers but not Chinese consumers' purchase behavior. Therefore, multinational companies are relatively free to make the decision, if Chinese consumers are the marketing targets, when choosing manufacturing sites.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.943-946
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• 2004

We report the laser scanning display as an emerging technology. We show demonstration system of laser TV, Video image is made by using a high speed MEMS scanning mirror and a direct-modulated red diode laser. We designed and fabricated MEMS scanning mirror. The first demonstration system showed a NTSC-resolution video image with the image size of 5 inches. The successful development of compact laser TV will open a new area of home application of the laser light.

• 식품기술
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• 제22권2호
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• pp.265-272
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• 2009

• 대한의용생체공학회:의공학회지
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• 제3권2호
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• pp.119-122
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• 1982

This paper presents the principles of image formation in NMR(Nuclear Magnetic Resonance) tomography. NMR tomographic imaging is a newly emerging, noninvasive, three-dimensional imaging technique. This new technique is an interdisciplinary science which encompasses the latest technologies in electrical, electronics, computers, physics, chemistry, mathematics, and medical sciences.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권2호
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• pp.540-546
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• 2014

Recently a new government has announced an action plan known as the government 3.0, which aims to provide customized services for individual people, generate more jobs and support creative economy. Leading on from previous similar initiatives, the new scheme seeks to focus on open, share, communicate, and collaborate. In promoting Government 3.0, the crucial factor might be how to align the core services and policies of Government 3.0 with correspoding technologies. The paper describes the concepts and features of Government 3.0, identifies emerging Internet-based technologies and services toward the initiative, and finally provides improvement plans for Government 3.0. As a result, 10 issues to be brought together include: Smart Phone Applications and Service, Mobile Internet Computing and Application, Wireless and Sensor Network, Security & Privacy in Internet, Energy-efficient Computing & Smart Grid, Multimedia & Image Processing, Data Mining and Big Data, Software Engineering, Internet Business related Policy, and Management of Internet Application.