• International Journal of Computer Science & Network Security
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• 제22권1호
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• pp.97-104
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• 2022

In recent years, data privacy has become increasingly important. The goal of network cryptography is to protect data while it is being transmitted over the internet or a network. Social media and smartphone apps collect a lot of personal data which if exposed, might be damaging to privacy. As a result, sensitive data is exposed and data is shared without the data owner's consent. Personal Information is one of the concerns in data privacy. Protecting user data and sensitive information is the first step to keeping user data private. Many applications user data can be found on other websites. In this paper, we discuss the issue of privacy and suggest a mechanism for keeping user data hidden in other applications.

• 정보과학회 컴퓨팅의 실제 논문지
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• 제23권7호
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• pp.446-451
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• 2017

본 논문에서의 문맥의존 철자오류(Context-Sensitive Spelling Error) 교정 기법은 샤논(Shannon)의 노이지 채널 모형(noisy channel model)을 기반으로 한다. 논문에서 제안하는 교정 기법의 향상에는 보간(interpolation)을 사용하며, 일반적인 보간 방법은 확률의 중간 값을 채우는 방식으로 N-gram에 존재하지 않는 빈도를 (N-1)-gram과 (N-2)-gram 등에서 얻는다. 이와 같은 방식은 동일 통계 말뭉치를 기반으로 계산하는데 제안하는 방식에서는 통계 말뭉치와 교정 문서간의 빈도 정보를 이용하여 보간 한다. 교정 문서의 빈도를 이용하였을 때 이점은 다음과 같다. 첫째 통계 말뭉치에 존재하지 않고 교정 문서에서만 나타나는 신조어의 확률을 얻을 수 있다. 둘째 확률 값이 모호한 두 교정 후보가 있더라도 교정 문서를 참고로 교정하게 되어 모호성을 해소한다. 제안한 방법은 기존 교정 모형보다 정밀도와 재현율의 성능향상을 보였다.

• 한국항행학회논문지
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• 제15권1호
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• pp.76-82
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• 2011

다수의 이종 무선망들 중에서 스케일러블 비디오 스트리밍 서비스에 적합한 망을 선택하는 경우, 기존에는 망 품질만을 고려하였다. 그러나 사용자 중심의 체감품질을 고려하지 않고 망 선택을 함에 따라 서비스에 대한 체감 만족이 낮아지는 문제가 있다. 이에 따라, 본 논문에서는 스케일러블 비디오 스트리밍 서비스를 위해 망의 품질뿐만 아니라 일반 사용자, 가격민감 사용자, 품질민감 사용자로 사용자의 소비성향을 구분하고 비디오 품질열화에 대한 서비스 가격 만족도 등을 고려한 체감품질기반의 망 선택 알고리즘을 제안한다. 실험결과 일반 사용자보다 가격민감 사용자와 품질민감 사용자는 각각 36%, 9% 정도 체감만족 향상을 갖는 망을 선택할 수 있었다.

• International Journal of Internet, Broadcasting and Communication
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• 제8권2호
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• pp.49-54
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• 2016

Data delivery is very challenging in VANETs because of its unique characteristics, such as fast topology change, frequent disruptions, and rare contact opportunities. This paper tries to explore the scope of 3G-assisted data delivery in a VANET within a budget constraint of 3G traffic. It is started from the simple S_Random (Srand) and finally reached the 3GSDD, i.e., the proposed algorithm. The performance evaluation of different algorithms is done through the two metrics delivery ratio and average delay. A third function utility is created to reflect the above two metrics and is used to find out the best algorithm. A packet can either be delivered via multihop transmissions in the VANET or via 3G. The main challenge is to decide which set of packets should be selected for 3G transmissions and when to deliver them via 3G. The aim is to select and send those packets through 3G that are most sensitive and requiring immediate attention. Through appropriate communication mechanism, these sensitive information are delivered via VANET for 3G transmissions. This way the sensitive information which could not be transmitted through normal VANET will certainly find its destination through 3G transmission unconditionally and with top priority. The delivery ratio of the packets can also be maximized by this system.

• 복식
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• 제56권1호
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• pp.56-69
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• 2006

The purposes of this study were to identify cosmetics purchasing behavior according the 20-30 year old men's lifestyle. The results were as follows; 1. The factors of men's lifestyle were sense of fashion, participation of social activities, use of web-based information, sense of androgyny, economical efficiency, provision of web-base information, sport activities, and pursuit of change, and they were segmented into a passive stagnant group, a economic web-base information utilizing group, a positive social activity participation group, and a sensitive appearance change pursuit group. 2. Passive stagnant group used less information sources patronized cosmetics specialty store, did not select their cosmetics by themselves, and spent less for their cosmetics. Economic web-base information utilizing group used information sources positively, patronized cosmetics discount store or internet shopping, and spent less for cosmetics. Positive social activity participation group patronized cosmetics specialty store or discount store, but did not select cosmetics by themselves. Sensitive appearance change pursuit group patronized department store or internet shopping for cosmetics, selected cosmetics by themselves, and spent more. 3. Passive stagnant group showed a tendency of older, less educated, and lower incomes, but economic web-base information utilizing group were among the age of 20's, lower educated, and the unmarried with average incomes. Positive social activity participation group showed a tendency of older, highly educated, and the married with jobs, but sensitive appearance change pursuit group were among the age of 20's and university students with more incomes and pocket money.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2007년도 가을 학술발표논문집 Vol.34 No.2 (A)
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• pp.221-222
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• 2007

• 복식
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• 제52권7호
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• pp.71-85
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• 2002

The purpose of this study is (1) to research on the diverse evaluation criteria suggested in the existing literatures, selected the contents of the evaluation according to the evaluation factors, and examined whether they are appropriate for the evaluation of websites that offer Clothing and Ornament related information through reliability analysis - all to set the evaluation criteria for the websites that acquire data. In addition. (2) contents of evaluation which are deemed important by the users and developers were compared and recommended as the detailed evaluation contents according to evaluation factors. The results of this study were as follows. 1. The evaluation factors for the fashion websites that provide Clothing and Ornament related information were selected as follows: contents of the information(11 contents of evaluation), ease of use(12), screen design(10), accessibility(9), sensitive enjoyment(4), scope of information use(3), purpose(1), and target user(1). As result of reliability analysis. Cronbach's a contents of the information (0.76), ease of use (0.77), screen design (0.85), accessibility (0.81), sensitive enjoyment (0.71), and scope of information use (0.52). 2. When the level of importance for the detailed evaluation contents was examined from the user and developer point of view, recency of information. rapid speed for the websites access. fast loading of webtext and fast transmission speed topped the list as first, second and third places.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권8호
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• pp.2490-2506
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• 2022

In Mobile Edge Computing (MEC), attackers can speculate and mine sensitive user information by eavesdropping wireless channel status and offloading usage pattern, leading to user privacy leakage. To solve this problem, this paper proposes a Privacy-preserving and Energy-efficient Offloading Algorithm (PEOA) based on Lyapunov optimization. In this method, a continuous Markov process offloading model with a buffer queue strategy is built first. Then the amount of privacy of offloading usage pattern in wireless channel is defined. Finally, by introducing the Lyapunov optimization, the problem of minimum average energy consumption in continuous state transition process with privacy constraints in the infinite time domain is transformed into the minimum value problem of each timeslot, which reduces the complexity of algorithms and helps obtain the optimal solution while maintaining low energy consumption. The experimental results show that, compared with other methods, PEOA can maintain the amount of privacy accumulation in the system near zero, while sustaining low average energy consumption costs. This makes it difficult for attackers to infer sensitive user information through offloading usage patterns, thus effectively protecting user privacy and safety.

• 한국언어정보학회지:언어와정보
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• 제1권
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• pp.137-179
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• 1997

This paper discusses several basic issues of the 'focus' phenomenon. One of them is the issue of the nature of focus, i.e., what constituent of the sentences gets focused. Another is the issue of to what aspect of meaning the focus contributes. The other is the issue of the functions of focus-sensitive operators. As for the first issue, it is observed that the basic function of focus is to mark all and only the new information of the sentence. But for the cases in which this principle is not observed, it is proposed that the focus in these cases in general plays a secondary function of triggering an additional emphatic scalar meaning. And yet, in these cases, the state of the matter is different between free focus and bound focus. It is also shown that contrary to the general belief that free focus contributes to the meaning semantically. Concerning focus-sensitive operators, we classify them into two groups, i.e., quantificational and scalar operators, and try to formalize their meaning in the framework of Pulman's(1997) 'higher order unification theory'.

• Journal of Electrical Engineering and information Science
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• 제2권5호
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• pp.89-99
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• 1997

The application for real-time database systems must satisfy timing constraints. Typically the timing constraints are expressed in the form of deadlines which are represented by priorities to e used by schedulers. In any real-time applications, since the system maintains sensitive information to be shared by multiple users with different levels of security clearance, security is another important requirement. As more advanced database systems are being used in applications that need to support timeliness while managing sensitive information, protocols that satisfy both requirements need to be developed. In this appear, we proposed a new priority-driven secure multiversion locking (PSMVL) protocol for real-time secure database systems. The schedules produced by PSMVL are proven to e one-copy serializable. We have also shown tat the protocol eliminates covert channels and priority inversions. The details of the protocol, including the compatibility matrix and the version selection algorithms are presented. the results of the performance comparisons of our protocol with other protocols are described.