• 정보보호학회논문지
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• 제13권2호
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• pp.69-80
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• 2003

확인 가능한 암호화 기법(verifiable encryption)은 암호문을 해독하지 못해도 어떤 것이 암호화되어 있는지 확인할 수 있는 기법이다. 이 기법은 공정한 교환(fair exchange)에서 암호화된 물건을 먼저 상대방에게 제시하여 상대방이 그것을 받을 수 있다는 확신을 갖도록 하는데 사용된다. 그러나 지금까지의 공정한 교환은 참여자의 익명성을 고려하지 않았다. 이 논문에서는 표현문제(representation problem)를 사용하는 익명의 화폐시스템에 이러한 확인 가능한 암호화 기법을 적용하여, 지불의 원자성을 제공하는 방법을 제안한다. 이 방법은 기존의 방법과는 달리 분쟁을 해결할 때 신뢰기관이 은행으로부터 상점의 입금여부를 확인할 필요가 없어서 효율적이다. 또한 상점의 입금시한이 없으며, 고객과 상점 모두 시간적인 제약 없이 분쟁해결을 요청할 수 있는 유연한 방식이다. 반면에 지불과정에서 확인 가능한 암호화를 적용하기 위한 증명이 요구되므로 추가비용이 들어간다. 새 시스템의 안전성과 기존의 원자성 보장 방법과의 비교분석도 논의한다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2006년도 동계 학술대회 논문집
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• pp.31-34
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• 2006

Purposes of this research are convenience of manufacture, quality sophistication and reduction of a/s' ratio by that improve several shortcomings of existing steel housing The Housing of head is changed existent steel housing to ABS (acrylonitrile butadiene styrene) copolymer housing and its shape is changed. It does not need that paint housing by paint. so We may not care scar at storage or manufacture. The fast work speed and A/S is possible by combining a safety plate and a housing by volt and spring washer. When disjoint head part, there is no damage of safety plate and housing. Noise is disappeared by resonance phenomenon in early rpm at motor moving. When neck part of housing and a middle pipe are connected by drill nasa, the work is easier Also, there is sense of security little more catching motor in housing The improvement accomplished much improvements including light weight of head part.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.628-631
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• 2003

In this paper, we present real-time, accurate face region detection and tracking technique for an intelligent surveillance system. It is very important to obtain the high-resolution images, which enables accurate identification of an object-of-interest. Conventional surveillance or security systems, however, usually provide poor image quality because they use one or more fixed cameras and keep recording scenes without any cine. We implemented a real-time surveillance system that tracks a moving person using four pan-tilt-zoom (PTZ) cameras. While tracking, the region-of-interest (ROI) can be obtained by using a low-pass filter and background subtraction. Color information in the ROI is updated to extract features for optimal tracking and zooming. The experiment with real human faces showed highly acceptable results in the sense of both accuracy and computational efficiency.

• 한국가정과학회지
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• 제7권1호
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• pp.81-99
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• 2004

This study examined one room(studio apartment) residential deweller's housing behavior and housing need, and the relationship between the sense of housing values and housing satisfaction of one-room residence, The study surveyed 302 one-room residents in Busan city. The researcher modified, complimented, and used the previous researches on housing values and housing satisfaction. The analysis of the data used SPSS Win 10.0 program. The results of the research can be summarized as follows: 1. The motive of choosing one-room residence was mainly the closeness to the school or work, Jeonse(Rent with a one-room deposit) was more common than ownership, and the size is one-room residence was 10 to 15 Pyeong. 2. Among the five housing values of one-room residence dwellers, that is, amenity, indoor and outdoor environment, economy/convenience, convenience in transportation, and the interior functionality, the convenience in transportation was ranked highest, and the indoor and out door environment and economy/convenience followed. 3. The housing satisfaction of one-room residents was highest in location, and also high in the safety and the security or privacy, and the convenience of inside facility.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 추계학술대회
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• pp.474-476
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• 2018

현재 기후 변화를 비롯한 여러 자연재해 및 여러 재해로 인해 막대한 손실을 가져오고 있으며, 이러한 자연재해는 원천적 차단은 어렵다. 그러나 이런 재난 현장의 정보를 실시간으로 수집하여 빠른 시간내에 피해를 줄이기 위한 방안으로 본 연구에서는 ICT 기술을 접목하여 대응전략을 구사하며, 미래 유비쿼터스 사회를 대비하기 위한 USN 기술을 응용한 모델이 필요하여 제안하고자 한다.

• International Journal of Internet, Broadcasting and Communication
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• 제13권1호
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• pp.238-242
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• 2021

Game theory has been regarded as a useful theoretical tool for modeling the interactions between distinct entities and thus it has been harnessed in various research field. In particular, research attention has been shown to how to apply game theory to modeling the interactions between malign and benign entities in the field of wireless networks. Although various game theoretic modeling work have been proposed in the field of wireless networks, our proposed work is disparate to the existing work in the sense that we focus on mobile malign node detection problem in static wireless sensor networks. More specifically, we propose a Bayesian game theoretic modeling for mobile malign node detection problem in static wireless sensor networks. In our modeling, we formulate a two-player static Bayesian game with imperfect information such that player 1 is aware of the type of player 2, but player 2 is not aware of the type of player 1. We use four strategies in our static Bayesian game. We obtain Bayesian Nash Equilibria with pure strategies under certain conditions.

• Journal of the Korean Statistical Society
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• 제35권2호
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• pp.115-142
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• 2006

This paper studies the problem of option hedging when the underlying asset price process is a compound Poisson process. By adopting an asymptotic approach to let the security price converge to a continuous process, we find a closed-form hedging strategy that improves the classical Black-Scholes hedging strategy in a quadratic sense. We first show that the scaled Black-scholes hedging error has a limit in law, and that limit is decomposed into a part that can be traded away and a part that is purely unreplicable. The Black-Scholes hedging strategy is then modified by adding the replicable part of its hedging error and by adding the mean-variance hedging strategy to the nonreplicable part. Some results of simulation experiment s are also provided.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.317-320
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• 2003

In this paper, we present real-time, accurate face region detection and tracking technique for an intelligent surveillance system. It is very important to obtain the high-resolution images, which enables accurate identification of an object-of-interest. Conventional surveillance or security systems, however, usually provide poor image quality because they use one or more fixed cameras and keep recording scenes without any clue. We implemented a real-time surveillance system that tracks a moving person using pan-tilt-zoom (PTZ) cameras. While tracking, the region-of-interest (ROI) can be obtained by using a low-pass filter and background subtraction. Color information in the ROI is updated to extract features for optimal tracking and zooming. The experiment with real human faces showed highly acceptable results in the sense of both accuracy and computational efficiency.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2012년도 추계학술대회
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• pp.154-156
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• 2012

This paper presents a user authentication scheme for healthcare application using wireless medical sensor networks, where wireless medical sensors are used for patients monitoring. These medical sensors' sense the patient body data and transmit it to the professionals (e.g., doctors, nurses, and surgeons). Since, the data of an individual are highly vulnerable; it must ensures that patients medical vital signs are secure, and are not exposed to an unauthorized person. In this regards, we have proposed a user1 authentication scheme for healthcare application using medical sensor networks. The proposed scheme includes: a novel two-factor professionals authentication (user authentication), where the healthcare professionals are authenticated before access the patient's body data; a secure session key is establish between the patient sensor node and the professional at the end of user authentication. Furthermore, the analysis shows that the proposed scheme is safeguard to various practical attacks and achieves efficiency at low computation cost.

• 한국멀티미디어학회논문지
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• 제21권8호
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• pp.829-836
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• 2018

This study attempts to detect a shot boundary in films(or dramas) based on the length of a sequence. As films or dramas use scene change effects a lot, the issues regarding the effects are more diverse than those used in surveillance cameras, sports videos, medical care and security. Visual techniques used in films are focused on the human sense of aesthetic therefore, it is difficult to solve the errors in shot boundary detection with the method employed in surveillance cameras. In order to define the errors arisen from the scene change effects between the images and resolve those issues, the mixed algorithm based upon color histogram, edge histogram, and optical flow was implemented. The shot boundary data from this study will be used when analysing the configuration of meaningful shots in sequences in the future.