• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(3)
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• pp.131-134
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• 2002

As the increased use of computer, wired/wireless/mobile Internet, security in using Internet becomes a more important problem. Thus, biometric technology using physical and behavior characteristics of a person is hot issue. Many different types of biometric technologies of a person such as fingerprint, face, iris, vein, DNA, brain wave, palm, voice, dynamic signature, etc. had already been studied but remained unsuccessful because they do not meet social demands. However, recently many of these technologies have been actively revived and researchers have developed new products on various commercial fields. Dynamic signature verification technology is to verify the signer by calculating his writing manner, speed, angle, and the number of strokes, order, the down/up/movement of pen when the signer input his signature with an electronic pen for his authentication. Then signature verification system collects mentioned above various feature information and compares it with the original one and simultaneously analyzes to decide whether signature is forgery or true. The prospect of signature verification technology is very promising and its use will be wide spread in terms of economy, security, practicality, stability and convenience.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2000년도 제1회 학술대회 논문집
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• pp.223-224
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• 2000

As technology level of TFT-LCD advances, application to TV becomes an emerging important area for LCD makers. In this paper, we review current LCD technology level to be used in TV such as liquid crystal response behavior, color accuracy, contrast ratio, brightness and panel size. Based on the understanding of current limitations in LCD compared with CRT, the improvement plan to render 'near perfect motion picture' reproduction with LCD is proposed. Digital TV is a great opportunity for digital LCD panels, but we have to solve remaining technical and cost issue in order to be competitive with other large size TV technologies such as PDP, CRT or projection type. In preparing the upcoming digital TV era with advanced TFT-LCD, the hurdles and prospect of larger size LCD-TV panels will be discussed.

• Structural Engineering and Mechanics
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• 제60권6호
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• pp.923-937
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• 2016

The common prospect in diminishing mine-blast vibration is decreasing vibration with increasing distance. This paper indicates that, contrary to the general expectancy, vibration waves change their forms when they are travelling through the low velocity layer like coal and so-called guided waves moving the vibration waves to longer distances without decreasing their amplitudes. The reason for this unexpected vibration increase is the formation of guided waves in the coal bed which has low density and low seismic velocity with respect to the neighboring layers. The amplitudes of these guided waves, that are capable of traveling long distances depending on the seam thickness, are several times higher than that of the usual vibration waves. This phenomenon can many complaints from the residential areas very far away from the blasting sites. Thus, this unexpected behavior of the coal beds in the surface coal mines should also be considered in vibration minimization studies. This study developed a model to predict the effects of guided waves on the propagation ways of blast-induced vibrations. Therefore, vibration mitigation studies considering the nearby buildings can be focused on these target places.

• International Journal of Computer Science & Network Security
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• 제21권6호
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• pp.294-303
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• 2021

VANET is an upcoming technology with an encouraging prospect as well as great challenges, specifically in its security. This paper intends to survey such probable attacks and the correlating detection mechanisms that are introduced in the literature. Accordingly, administering security and protecting the owner's privacy has become a primary argument in VANETs. To furnish stronger security and preserve privacy, one should recognize the various probable attacks on the network and the essence of their behavior. This paper presents a comprehensive survey on diversified attacks and the recommended unfolding by the various researchers which concentrate on security services and the corresponding countermeasures to make VANET communications more secure.

• 디지털융복합연구
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• 제14권3호
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• pp.453-464
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• 2016

본 연구는 현대사회의 부모양육행동은 사회문화적 환경의 시대적 변화를 반영하여 변화되어야 한다는 연구의 필요성에 근거하여 시도되었다. 따라서 기존의 부모양육행동과 비고츠키의 사회구성주의적 아동발달 관점에서의 양육행동을 비교 분석하였다. 이를 위하여 근접발달단계에 있는 아동들의 성장과 발달을 촉진할 수 있는 사회구성주의적 부모양육행동을 분석하여 양육행동의 핵심요인으로 비고츠키 이론의 핵심요인을 탐색하였다. 연구방법으로는 비고츠키 이론을 중심으로 한 연구들을 분석하여 요인을 추출한 후 비고츠키 이론에 관한 전문가 3명의 타당화 작업을 통하여 내용타당성을 확인하였다. 연구결과, 첫째, 사회적 상호작용에서의 협력적 상호작용 요인 둘째, 사회적 구성행동에서의 내면화 강조 요인 셋째, 근접발달영역에서의 잠재성 계발 요인 넷째, 중재적 매개체로서의 교육적 대화 요인 다섯째, 스캐폴딩(scaffolding)으로서의 조력설정 요인이 추출되었다. 본 연구의 결과는 부모양육행동의 새로운 패러다임으로써, 사회구성주의적 부모양육행동 척도를 개발하는데 새로운 시도를 마련했다는 점에서 연구의 큰 의의를 갖는다.

• 사회복지연구
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• 제37호
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• pp.241-266
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• 2008

개인기부자는 비영리기관의 사회적 신뢰 및 자원 확보를 가능하게 해주는 중요한 기반으로, 기관과의 관계를 중심으로 비기부자, 기부자, 기부중단자 집단으로 구분될 수 있다. 본 연구는 이 중 기부중단자의 특성 및 중단이후 기부행위에 관하여 국내에서 이루어진 초기 연구로서 의의가 있다. 본 연구를 통해 확인한 주요 사항은 다음과 같다. 우선 대부분의 기부중단자는 경제적 상황과 관심의 변화(타기관 혹은 다른 대의명분으로의 관심이동)로 인해 특정기관에 대한 기부중단을 결정하게 된다. 그렇지만 이들 중 상당수는 일반적인 예상과 달리 기부실망자가 아니고, 따라서 기부를 아예 중단하기보다는 기부를 다시 시작하는 경향이 높다. 그리고 이전 기부대상에 대한 신뢰(긍정적인 기부경험)는 이처럼 기부중단자가 다시 기부를 시작하게 되는데 긍정적인 영향을 미친다. 즉, 기부자의 기관신뢰는 비영리기관의 현 기부자 유지 차원에서도 중요하지만, 이들이 여러 가지 이유로 기부를 중단한 이후에도 비영리부문 전체에 대한 신뢰를 잃지 않고 다시 기부를 하게 하는데 도움을 주는 것이다. 이를 통해 비영리기관과 기부자와 맺는 긍정적인 관계의 중요성을 다시 한번 확인할 수 있다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.491-494
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• 2002

The real-time industrial network often referred to as fieldbus, is an important element for building automated manufacturing systems. Thus, in order to satisfy the real-time requirements of field devices such as sensors, actuators, and controllers. numerous standard organizations and vendors have developed various fieldbus protocols such as Profibus, WorldFIP and Foundation Fieldbus. However, the application of fieldbus has been limited due to the high cost of hardware and the difficulty in interfacing with multi-vendor products. In order to solve these problems, the computer network technology, especially Ethernet (IEEE 802.3), is being adopted lo the industrial environment. The crucial technical obstacle for Ethernet is that its non-deterministic behavior makes it inadequate for industrial applications where real-time data such as control command and alarm signal hale to be delivered within a certain time limit. Recently, the development of switched Ethernet shows a very promising prospect for industrial application due to the elimination of uncertainties in the network operation resulting in much improved performance. This paper focuses on the application of the switched Ethernet for industrial comm unications.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.513-516
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• 2015

헬스케어 산업은 첨단 IT 제품과 무선 통신의 발달로 급속도로 성장하고 있는 분야다. 특히 우리나라는 물론 세계적으로 고령화 사회에 접어들고 있어 직접 병원에 방문하기보단 언제 어디서나 치료를 받고 싶어 하는 이용자들이 증가하는 추세이다. 또한 최근에는 창의적인 아이디어를 가진 신생기업들도 설립되고 있고 헬스케어 산업이 발전함에 따라 사물인터넷을 이용한 헬스케어 디바이스도 개발되고 있다. 따라서 본 논문에서는 헬스케어 소비자를 대상으로 한 설문조사를 통해 헬스케어 이용 동향 및 문제점을 분석하였다. 그리고 이를 통해 향후 헬스케어 시장의 발전 방안을 제시했다.

• The Journal of Asian Finance, Economics and Business
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• 제7권2호
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• pp.99-106
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• 2020

CEOs Overconfidence can bring potentially risky early decisions to businesses, along with large enterprise free cash flow that can bring different investment decisions with CEOs Overconfidence. Especially in the context of Vietnamese enterprises, CEOs are often influenced by behavioral psychology about overconfidence in investment decisions (due to individual cultural characteristics as well as operating financial markets also depend on many factors outside the market). Therefore, the authors study the impact of overconfidence and cash flow on investment in Vietnamese to find the internal relationship between these three factors in the financial environment in Vietnam. With 480 companies listed on the Vietnam Stock Exchange from 2014 to 2018 (companies have continuous reports), the regression analysis results with panel data (FEM, GLS models, correction of robust and GMM dealing with endogenous problems) have shown Overconfidence has a positive impact on investment. At the same time, the results also indicated that enterprises with overconfident CEOs and large cash flows tend to invest less than enterprises with low cash flow. The results of this study have shown the behavioral behavior of CEOs in Vietnamese enterprises that exist under both prospect theory and effective market theory.

• 제어로봇시스템학회논문지
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• 제9권1호
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• pp.90-98
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• 2003

The real-time industrial network, often referred to as fieldbus, is an important element for building automated manufacturing systems. Thus, in order to satisfy the real-time requirements of field devices, numerous fieldbus protocols have been announced. But the application of fieldbus has been limited due to the high cost of hardware and the difficulty in interfacing with multi-vendor products. Therefore, as an alternative to fieldbus, the computer network technology, especially Ethernet (IEEE 802.3), is being adapted to the industrial environment. However, the crucial technical obstacle for Ethernet is its non-deterministic behavior that makes it inadequate for industrial applications where real-time data have to be delivered within a certain time limit. Recently, the development of switched Ethernet shows a very promising prospect for industrial application due to the elimination of uncertainties in the network operation resulting in much improved performance. This paper focuses on the application of the switched Ethernet for industrial communications. More specifically, this paper presents an analytical and experimental performance evaluation of the switched Ethernet and a case study about networked control system.