• 한국정보과학회논문지:데이타베이스
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• 제36권4호
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• pp.306-313
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• 2009

센서 네트워크 응용 분야에서 Top-k 질의는 가장 높은 혹은 가장 낮은 k개의 센서에 대한 유용한 정보를 제공한다. Top-k 질의 처리 시 에너지 소모를 줄이기 위한 많은 연구들이 진행되었다. FILA의 경우, 필터를 이용하여 불필요한 결과의 갱신을 제거하였으며, PRIM의 경우, 센싱된 데이타의 우선 순위를 부여하여 센서 데이타의 전송을 최소화하는 방법을 제안한다. 하지만, 같은 데이타 범위(프레임)에 속한 모든 데이타를 수집하기 때문에 데이타의 집중이 발생하면 많은 False Positive 데이타를 전송하는 문제가 발생한다. 본 논문에서는 Top-k 결과의 False Positive 데이타를 효과적으로 제거하기 위한 클러스터 기반의 새로운 Top-k 질의 처리 기법을 제안한다. 질의 처리 과정은 클러스터 레벨과 트리 레벨로 나누어지며, 각 레벨의 네트워크 토폴로지의 특성을 활용하여 False Positive 데이타를 효과적으로 필터링 한다. 성능 평가 결과, 기존 Top-k 질의 처리 기법에 비해 False Positive 데이타의 수가 70% 감소하고, 네트워크 수명이 약 105% 연장된다.

• 한국축산식품학회지
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• 제44권2호
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• pp.284-298
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• 2024

Restructured meat (RM) products are gaining importance as an essential component of the meat industry due to consumers' interest in health benefits. RM products imply the binding or holding of meat, meat by-products, and vegetable proteins together to form a meat product with meat's sensory and textural properties. RM products provide consumers with diversified preferences like the intake of low salt, low fat, antioxidants, and high dietary fiber in meat products. From the point of environmental sustainability, RM may aid in combining underutilized products and low-valued meat by adequately utilizing them instead of dumping them as waste material. RM processing technique might also help develop diversified and new hybrid meat products. It is crucial to have more knowledge on the quality issues, selection of binding agents, their optimum proportion, and finally, the ideal processing techniques. It is observed in this study that the most crucial feature of RM could be its healthy products with reduced fat content, which aligns with the preferences of health-conscious consumers who seek low-fat, low-salt, high-fiber options with minimal synthetic additives. This review briefly overviews RM and the factors affecting the quality and shelf life. Moreover, it discusses the recent studies on binding agents in processing RM products. Nonetheless, the recent advancements in processing and market scenarios have been summarized to better understand future research needs. The purpose of this review was to bring light to the ways of sustainable and economical food production.

• The Journal of the Acoustical Society of Korea
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• 제18권3E호
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• pp.37-43
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• 1999

In this paper, we present a new technique for the optimal local decomposition of convex structuring elements on a hexagonal grid, which are used as templates for morphological image processing. Each basis structuring element in a local decomposition is a local convex structuring element, which can be contained in hexagonal window centered at the origin. Generally, local decomposition of a structuring element results in great savings in the processing time for computing morphological operations. First, we define a convex structuring element on a hexagonal grid and formulate the necessary and sufficient conditions to decompose a convex structuring element into the set of basis convex structuring elements. Further, a cost function was defined to represent the amount of computation or execution time required for performing dilations on different computing environments and by different implementation methods. Then the decomposition condition and the cost function are applied to find the optimal local decomposition of convex structuring elements, which guarantees the minimal amount of computation for morphological operation. Simulation shows that optimal local decomposition results in great reduction in the amount of computation for morphological operations. Our technique is general and flexible since different cost functions could be used to achieve optimal local decomposition for different computing environments and implementation methods.

• Journal of Information Processing Systems
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• 제13권3호
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• pp.435-447
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• 2017

Associative and bidirectional associative memories are examples of associative structures studied intensively in the literature. The underlying idea is to realize associative mapping so that the recall processes (one-directional and bidirectional ones) are realized with minimal recall errors. Associative and fuzzy associative memories have been studied in numerous areas yielding efficient applications for image recall and enhancements and fuzzy controllers, which can be regarded as one-directional associative memories. In this study, we revisit and augment the concept of associative memories by offering some new design insights where the corresponding mappings are realized on the basis of a related collection of landmarks (prototypes) over which an associative mapping becomes spanned. In light of the bidirectional character of mappings, we have developed an augmentation of the existing fuzzy clustering (fuzzy c-means, FCM) in the form of a so-called collaborative fuzzy clustering. Here, an interaction in the formation of prototypes is optimized so that the bidirectional recall errors can be minimized. Furthermore, we generalized the mapping into its granular version in which numeric prototypes that are formed through the clustering process are made granular so that the quality of the recall can be quantified. We propose several scenarios in which the allocation of information granularity is aimed at the optimization of the characteristics of recalled results (information granules) that are quantified in terms of coverage and specificity. We also introduce various architectural augmentations of the associative structures.

• 한국정보처리학회논문지
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• 제3권7호
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• pp.1707-1718
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• 1996

N개의 signal net와 소스 노드 s, 싱크 노드가 있을 때, 최소 비용 직각선분 거리 유지 트리의 s와 싱크 간의 노선 길이는 s와 싱크 간의 직각선분의 길이와 일치한다. 최소 비용 직각선분 Steiner 거리유지 트리는 최단 s와 싱크 간의 직각선분 길이를 유지하면서 전체 트리 비용이 최소가 되도록 하는 것이다. 최소 비용 직각선분 Steiner 거리 유지 트리를 찾는 휴리스틱 알고리즘이 최근에 발표된 바 있는데, 본 논문에서는 O(n2 log m)2) 계산시간 내에 비용을 최소화하는 알고리즘을 제안한다. 네트워크 흐름 이론과 최소 비용 흐름 알고리즘을 이용하여 최적화 해를 발견하였다. 더욱 일반화된 응용 연구가 제안 되었고 관련 미해결 문제를 제시하였다.

• 한국정보처리학회논문지
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• 제5권9호
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• pp.2404-2414
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• 1998

다중개성을 지원하는 운영체계는 각 사용자의 필요성에 따라 수정과 확장이 용이하게 이루어져야만 한다. 마이크로커널 구조의 운영체계로서 적합한 반면, 프로세스간 통신(interprocess communication: IPC)에서 발생되는 마이크로커널구조의 부담 때문에 시스템 성능이 저하되는 문제점을 갖고 있다. 본 논문에서는 기존의 IPC 기법 성능을 개선하기 위하여 운영체계의 구성요소들간에 직접 프로시져 호출방식의 새로운 IPC 기법을 제안한다. 새로운 기법에 의한 통신 부담은 최상의 경우에는 로컬 프로시져 호출 수준이고, 최악의 경우에도 기존의 메시지전송 통신기법보다는 성능이 향상된다.

• Asian-Australasian Journal of Animal Sciences
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• 제16권5호
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• pp.764-772
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• 2003

Two genetic constructs used to confer improved agronomic characteristics, namely herbicide tolerance (HT) in maize and soyabean and insect resistance (Bt) in maize, are considered in respect of feeding to farm livestock, animal performance and the nutritional value and safety of animal products. A review of nucleic acid (DNA) and protein digestion in farm livestock concludes that the frequency of intact transgenic DNA and proteins of GM and non-GM crops being absorbed is minimal/non existent, although there is some evidence of the presence of short fragments of rubisco DNA of non-GM soya in animal tissues. It has been established that feed processing (especially heat) prior to feeding causes significant disruption of plant DNA. Studies with ruminant and non-ruminant farm livestock offered GM feeds demonstrated that animal performance and product composition are unaffected and that there is no evidence of transgenic DNA or proteins of current GM in the products of animals consuming such feeds. On this evidence, current HT and Bt constructs represent no threat to the health of animals, or humans consuming the products of such animals. However as new GM constructs become available it will be necessary to subject these to rigorous evaluation.

• 한국정보처리학회논문지
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• 제6권1호
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• pp.216-224
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• 1999

날로 더욱 복잡해지는 제어 컴퓨터의 고 신뢰성 확보를 위해 시간여분(time redundancy)의 일종인 rollback과 roll-forward 기법 등을 TMR 구종에 적절하게 혼용하는 두 가지 방법을 제안한다. Rollback과 roll-forward 기법은 약간의 추가시간만을 사용하여 재구성(reconfiguration) 없이도 일시적인 결함(fault)에 의해 발생한 TMR 고장(failure)의 회복을 위해 상호보완적으로 사용될 수 있다. 본 논문은 시스템의 고장상태확률의 유도를 통해 전체 작업의 평균실행시간이 최소가 되는 최적의 checkpoint 간격벡터를 유도한다. 수치예제를 통해 제안된 방법들이 다른 고장회복 기법을 적용했을 때와 비교하여 매우 효과적임을 보이고, 다양한 환경 하에서 여러 가지 최적의 checkpoint 간격벡터를 유도하였으며, 시뮬레이션을 통한 정량적 결과로써 그 우수성을 비교하고 검증하였다

• 대한임상전기생리학회지
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• 제10권2호
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• pp.1-6
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• 2012

Purpose : This study is to investigate the modulatory effects to the ultraviolet induced erythema of pain processing system. Methods : Thirty six healthy volunteers were divided into none treatment group (n=6), indomethacine group (n=6), subsensory level electrical stimulation group (n=6), sensory level electrical stimulation group (n=6), motor level electrical stimulation group (n=6), noxious level electrical stimulation group (n=6). Subjects were induced erythema for three times minimal erythema dose (MED) at upper arm of dermatome C6 level. Each experimental group had mechanical pain threshold (MPT), electrical pain threshold (EPT), thermal pain threshold (TPT). Results : This study revealed that we observed that pain thresholds were significantly correlated with each other in pain processing system. The effect of electrical stimulation levels evaluates were shown to be significant differences pain control effect in electrical stimulation group (sensory, motor level electrical stimulation groups) more than indomethacine group, subsensory level and control group. Conclusion : In this study, it was found that the effect of ultraviolet induced erythema of pain control by modulatory electrical stimulation.

• Transactions on Electrical and Electronic Materials
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• 제16권1호
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• pp.16-19
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• 2015

A wearable sensing ECG T-shirt for ubiquitous vital signs sensing is proposed. The sensor system consists of a signal processing board and capacitive sensing electrodes which together enable measurement of an electrocardiogram (ECG) on the human chest with minimal discomfort. The capacitive sensing method was employed to prevent direct ECG measurement on the skin and also to provide maximum convenience to the user. Also, low power integrated circuits (ICs) and passive electrodes were employed in this research to reduce the power consumption of the entire system. Small flexible electrodes were placed into cotton pockets and affixed to the interior of a worn tight NIKE Pro combat T-shirt. Appropriate signal conditioning and processing were implemented to remove motion artifacts. The entire system was portable and consumed low power compared to conventional ECG devices. The ECG signal obtained from a 24 yr. old male was comparable to that of an ECG simulator.