• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 심포지엄 논문집 정보 및 제어부문
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• pp.56-58
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• 2004

In this paper, we propose an adaptive beamforming algorithm for array antenna. The proposed beamforming algorithm is based on EDS (Euclidean Direction Search) algorithm. Generally LMS algorithm has a much slower rate of convergence, but its low computational complexity and robustness make it a representative method of adaptive beamforming. Although the RLS algorithm is known for its fast convergence to the optimal Wiener solution, it still suffers from high computational complexity and poor performance. The proposed EDS algorithm has a rapid convergence better than LMS algorithm, and has a computational more simple complexity than RLS algorithm. In this paper we compared the efficiency of the EDS algorithm with a standard LMS algorithm.

• 스마트미디어저널
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• 제6권2호
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• pp.15-25
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• 2017

The security and privacy issues derived from unsecurely storing biometrics templates in biometric authentication/ recognition systems have opened a new research area about how to secure the stored biometric templates. Biometrics-based key generation is the newest approach that provides not only a mechanism to protect stored biometric templates in authentication/ recognition systems, but also a method to integrate biometric systems with cryptosystems. Therefore, this approach has attracted much attention from researchers worldwide. A review of current research state to summarize the achievements and remaining works is necessary for further works. In this study, we first outlined the requirements and the primary challenges when implementing these systems. We then summarize the proposed techniques and achievements in representative studies on biometrics-based key generation. From that, we give a discussion about the accomplishments and remaining works with the corresponding challenges in order to provide a direction for further researches in this area.

• Journal of Information Science Theory and Practice
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• 제8권4호
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• pp.20-28
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• 2020

In this study, the RDA DMP Common Standard (RDCS), a data model for implementing a machine actionable Data Management Plan (maDMP), was analyzed in four aspects. First, the twelve class models proposed by RDCS were analyzed. Second, whether the DMP attribute was included in the class attribute was analyzed. Third, we analyzed the namespace used for RDCS properties. Fourth, the values and identifiers used in RDCS properties were analyzed. As a result of the analysis, four directions for improvement were derived. First, it is necessary to add an academic record class to describe information such as papers and reports, which are representative academic documents. Second, the primary research institution, responsibility, resources, option attribute, and additional attributes are needed to describe the researcher's affiliation information. Third, it is necessary to additionally use a namespace such as Friend of a Friend that can be used universally. Fourth, the use of digital object identifier should be considered to identify academic literature.

• 무역학회지
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• 제44권6호
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• pp.201-216
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• 2019

At present, there are various standards used as the governing law of contracts for establishing, implementing, and resolving disputes between the parties to international sales contracts, called "Forum Shopping." Uncertainty and increased transaction costs, which may arise from these various norms, may hinder the activation of international commerce. This study examines the process of enacting and examining various international unification norms that have emerged through international organizations to eliminate trade barriers caused by choice of governing law concerning parties involved in the international sale of goods. Issues regarding the positive and negative perspectives are discussed to identify obstacles to international unification norms. In particular, by comparing and analyzing the differences between the regulations of the CISG and PICC, the representative international unification norms on international sales contracts, the possibility of unification of the norms on international sales contracts are reviewed. Direction for the establishment of a single international regulation is presented for reducing the transaction costs and uncertainties in the international sale of goods.

• 센서학회지
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• 제30권4호
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• pp.210-217
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• 2021

Gas sensors based on semiconducting metal oxides have attracted considerable attention for various applications owing to their facile, cheap, and small-scale manufacturing processes. Hematite (α-Fe₂O₃) is widely considered as a promising candidate for a gas-sensing material owing to not only its abundance in the earth's crust and low price but also its chemical stability and suitable bandgap energy. However, only a few studies have been performed in this direction because of the low gas response and sluggish response of hematite-based gas sensors. Nanostructures present a representative solution to both overcome these disadvantages and exploit the desirable features to produce high-performance gas sensors. However, several challenges remain for adopting gas sensors based on metal oxide nanostructures, such as improving cost efficiency and facilitating mass production. This review summarizes the recent studies on gas sensors based on hematite nanostructures. It also provides useful insights into various strategies for enhancing the gas-sensing properties of gas sensors based on hematite nanostructures.

• 전자통신동향분석
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• 제36권6호
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• pp.78-87
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• 2021

Information technology (IT) has been applied to various fields, and currently, IT devices and systems are used in very important areas, such as aviation, industry, and national defense. Such devices and systems are subject to various types of malicious attacks, which can be software or hardware based. Compared to software-based attacks, hardware-based attacks are known to be much more difficult to detect. A hardware Trojan horse is a representative example of hardware-based attacks. A hardware Trojan horse attack inserts a circuit into an IC chip. The inserted circuit performs malicious actions, such as causing a system malfunction or leaking important information. This has increased the potential for attack in the current supply chain environment, which is jointly developed by various companies. In this paper, we discuss the future direction of research by introducing attack cases, the characteristics of hardware Trojan horses, and countermeasure trends.

• 디지털융복합연구
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• 제10권5호
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• pp.185-191
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• 2012

본 연구는 현재 디지털 콘텐츠 시장에서 주요 이슈로 거론되고 있는 디지털 동영상 콘텐츠 저작권 보호와 관련된 기술적 접근을 다루고 있다. 오늘날 디지털 동영상 콘텐츠 제작 및 유통이 급증하고 있는 가운데 지적재산권 보호와 관련된 여러 정책적 접근 및 기술적 접근이 이루어지고 있다. 기존의 DRM(Digital Rights Management) 관점의 기술적 접근은 여러 각도에서 이루어져 왔으나 편의성 및 품질 측면에서 한계점 또한 동시에 노출된 것이 사실이다. 본 연구는 기존의 암호화 인증 및 워터마크 기술을 통한 접근보다는 video copy detection 및 contents based copy detection 방식의 하나인 컬러코드(color code) 방식의 기술적 접근 관점에서 접근하고 있다. 특히 본 연구는 국내 영상 시장의 유통 생태계를 고려하여 고품질 방송 동영상 불법유통을 제어할 수 있는 방향에서 본 연구의 기술적 접근을 다루었다.

• 한국의류산업학회지
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• 제19권2호
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• pp.207-220
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• 2017

Today, the fashion industries, which are appearing in the world, can satisfy their economic needs, as well as provide and distribute their products in order to introduce sustainable methods and avoid becoming a bad influence on future generations. Recently, SPA brands have contributed to the sustainable development of society with different kinds of products, such as organic, recycled and environmental products. For this research, among different SPA brands, we chose H&M as the most representative one. Using Russian and Korean consumers as examples, we analyzed how sustainable activities affect a consumer's ethical consciousness, brand loyalty and purchase intention. The results of this study show that firstly, all sustainable activities have positive effects on the ethical consciousness of Russian and, in particular, Korean consumers. Secondly, ethical consciousness has a positive effect on brand loyalty, which, in turn, has a positive effect on purchase intention. Consequently, by adding to the existing sustainable and cultural activities, we can propose new perspectives for future research on sustainability. Due to the effect on a consumer's ethical consciousness, future research might consider ethical consciousness as the main factor. By focusing on H&M as a representative of SPA brands with Russian and Korean consumers as target audiences, we can advise global SPA brands on the direction of their sustainable activities and exporting of their products to foreign markets.

• 한국운동역학회지
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• 제13권3호
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• pp.293-309
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• 2003

The purpose of this study was to analyze the kinematic variables of the right-straight punch(RSP) in boxing with three-dimensional analysis technical methods. The subjects are boxers who have been playing in national boxing representative team and the RSP is their special favorite technique, The right-straight punches were filmed on 16mm video cameras(30frames/sec.) The kinematic variables were temporal, postural and center of gravity(COG). The mean and the standard deviation of variables have been obtained and used as basic factors for examining characteristics of the RSP by out-boxers. From the data analysis and discussion, the following conclusions have been drawn. 1) Temporal variables It is a significant characteristic that LDJ and KDM s' the amount of elapsed time(EF) needed for both an attack and a defense were similar : ET for stretch-out of attack-arm was $0.52{\pm}0.04\;sec$. and return was $0.54{\pm}0.01\;sec$. Therefore, a defense motion is as important as an attack motion. 2) Posture variables When the subjects performed a RSP, the significant characteristic of the ankle angle was that it wasn't completely returned to the original position after stretching-out. Therefore it is necessary to do supplementary exercises, such as side steps, to move the center of gravity more effectively. The hee angle was not fully stretched either. In regard to the hip angle, it should be rotated with all strength to harmonize with the direction of movement. 3) Center of Gravity(COG) variables When both LDJ and KDM performed a RSP, a significant characteristic was the transformation of sagittal view rather than transverse or frontal views.

• 한국의류학회지
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• 제20권4호
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• pp.573-585
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• 1996

This study of counter-culture - the cultural background of the Jean Fashion of which express the consciousness and youthfulness of young - shows the various social, cultural developments and the direction of growth for the Jean industry Until now, the fashion trends flowed from the elite, upper-class minority to the general public : however, in the case of the Jean Fashion, it has spread inversely to the upper-class from the young people who have adopted the life-styles of the lower, middle class, working people. With the emphasis on Jean Fashion's establishment through and within a counter- culture influences, the first chapter explores the counter-culture's background theory and how fashion has metamorphisized within the counter-culture. The second chapter explores the image of the jeans within the society of the youth and the general public. Finally in the fourth chapter, this study divides the images of Jean Fashion within the youth and the general population into classifications of Feminism, Eroticism, Dismantlementation. Thus, 1 came to the conclusion that the above stated theories have had great influence on the Jean Fashion Industry. The conclusion of this study are as follows: 1 Jeans are the representative article of clothing of unisex appeal which is the core characteristic of Feminism. Feminism, which surfaced coincidentally with the emergence of jeans in the 1850s, took charge of expressing the freedoms and the wills of women. 2. Jeans, being the representative article of Eroticism, have firmly entrenched its image in the young people's wardrobe through mass media such as movies, $\mu$ic, and commercials. 3. In the 90s the tendencies of Defacement and Dismantlementation of Jeans developed. In the Dismantlement tendencies of colors, the color blue foretells of the century's coming to an end, and blue also expresses the superiority of spirit and intelligence which transcends materialism.