• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권3호
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• pp.522-538
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• 2013

Content based image retrieval has become an increasingly important research topic for its wide application. It is highly challenging when facing to large-scale database with large variance. The retrieval systems rely on a key component, the predefined or learned similarity measures over images. We note that, the similarity measures can be potential improved if the data distribution information is exploited using a more sophisticated way. In this paper, we propose a similarity measure learning approach for image retrieval. The similarity measure, so called Fisher kernel, is derived from the probabilistic distribution of images and is the function over observed data, hidden variable and model parameters, where the hidden variables encode high level information which are powerful in discrimination and are failed to be exploited in previous methods. We further propose a discriminative learning method for the similarity measure, i.e., encouraging the learned similarity to take a large value for a pair of images with the same label and to take a small value for a pair of images with distinct labels. The learned similarity measure, fully exploiting the data distribution, is well adapted to dataset and would improve the retrieval system. We evaluate the proposed method on Corel-1000, Corel5k, Caltech101 and MIRFlickr 25,000 databases. The results show the competitive performance of the proposed method.

• 자동차안전학회지
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• 제12권1호
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• pp.15-25
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• 2020

This paper presents a longitudinal control algorithm for ensuring takeover time of autonomous vehicle using V2V communication. In the autonomous driving of more than level 3, autonomous systems should control the vehicles by itself partially. However if the driver's intervention is required for functional safety, the driver should take over the control reasonably. Autonomous driving system has to be designed so that drivers can take over the control from autonomous vehicle reasonably for driving safety. In this study, control algorithm considering takeover time has been developed based on computation method of takeover time. Takeover time is analysed by conditions of longitudinal velocity of preceding vehicle in time-velocity plane. In addition, desired clearance is derived based on takeover time. The performance evaluation of the proposed algorithm in this study was conducted using 3D vehicle model with actual driving data in Matlab/Simulink environment. The results of the performance evaluation show that the longitudinal control algorithm can control while securing takeover time reasonably.

• 보건의료산업학회지
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• 제5권4호
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• pp.127-136
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• 2011

The improving in physical activity of Disability elder is the most important and effective way of prevent and treatment. Especially, It improves ADL(Activities Daily of Living) by decreasing restrictive function and dependence. This study was researched on change by comparing before and after about ADL of Women elders who were instructed self rehabilitation exercise in bedside and have been take that. The whole subjects are 92 persons. Elders aged 65 to 69 are 32 persons. elders aged 70 to 74 are 22 persons 38 persons are over the age of 75. This study shows that the whole subjects have been improved ADL. especially, "Take a bath" in detail items of ADL comes to the most improvement rate. Next, "Sit to stand on the bed and transfer" comes to the second highest rate. According to findings upon the age group. "Take a bath" is also the highest improvement rate. Elders aged 60 to 65 show "Sit to stand on the bed and transfer" is the second highest rate of improvement" and elders aged 70 to 74 show that "control urine" is the second highest rate of improvement. and elders over the age of 75 shows that "sit to stand on the bed and transfer" is the second highest rate of improvement. This study have some problems on having possibilities of results because hospitalized persons have answered imperfect statement and being compare progressed for short term with rehabilitation exercise. so, There are some causes that is early to be generalized.

• International Journal of Internet, Broadcasting and Communication
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• 제14권1호
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• pp.201-208
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• 2022

As around the world, ground and underground transportation capacity is reaching its limit, centering on urban areas. As urban traffic becomes congested, time and cost are astronomical, and environmental destruction caused by urban pollution is becoming increasingly serious. As a way to solve this problem, the means of flying over the air are in the spotlight as the next generation of future transportation, and the concept of urban air mobility (UAM, Urban Air Mobility) is defined as systematic planning. The development of an electric-powered vertical take-off (eVTOL) aircraft that obtains electric power through a battery using a personal aerial vehicle (PAV) as a means of transportation has accelerated. As the aircraft development of new technology aircraft in the evtol method is actively carried out, the need to prepare systems such as aircraft certification standards, pilot qualification systems, and qualification management is emerging. The Federal Aviation Administration (FAA) and the European Union Aviation Safety Agency (EASA), which lead international standards, announced new special technical conditions and temporary regulations SCVTOL-01, respectively. However, the pilot qualification system for operating the uam aircraft has not yet been clearly announced. Therefore, this paper analyzes the recently announced FAA regulations and EASA regulations to identify differences and directions in perspectives on UAMs and study the existing vertical take-off and landing aircraft (VTOL) pilot qualification system to present directions for qualification classification.

• 치과방사선
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• 제17권1호
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• pp.51-87
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• 1987

The incorporation of ³H-proline by epithelial and connective tissue elements of rat palatal mucosae was studied in order to investigate the relative levels of protein synthesis by the epithelium and underlying connective tissue cells. Following a sixty minutes incorporation of the radioactive tracer in vitro, it was found that the suprabasal cells had most grains per unit area. Furthermore, the grains were more concentrated over the cytoplasm than the nucleus. This was in contrast with the labeling of basal cells which had twice as many grains over the nucleoplasm than that over the cytoplasm. In intermediate cells; i.e., the spinous layer, the number of silver grains per unit area was decreased from that of the suprabasal cells. In areas where desmosomes were more prominent, many grains were in touch with such desmosomes. However, the labeling appeared to be reduced as soon as the cells became flattened. Moreover, the epidermal keratohyalin granules were relatively free of grains. Except for certain intercellular surfaces the keratinized cells were generally free of grains. On the connective tissue side, silver grains were primarily localized over the fibroblasts with occasional grains being found over palatal muscle cells, neural elements and so on. Most grains over collagenous fibers were found in relation to mature collagen fibrils. Thus, protein synthesis in isolated mucosae of the rat palate appeared to take place both in epithelial and connective elements. There were no apparent tissue alterations caused by the in vitro incorporation procedure utilized under conditions of this study.

• 대한토목학회논문집
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• 제13권1호
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• pp.89-96
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• 1993

수자원시설물의 설계에 이용되는 기존의 물수지분석은 수자원의 공간적 분포를 고려하지 못하는 단점이 있다. 특히 많은 수자원의 외부공급량이 있고, 공급 대상지역이 중복될 경우 기존의 물수지분석을 적용할 경우 설계치가 과대 산정될 수 있다. 따라서 본 연구에서는 수자원의 공간적 분포를 고려한 물수지분석 방법을 제시하고, 수자원이용이 대단히 복잡한 동진강, 만경강유역을 포함하는 새만금사업지역을 대상으로 새로운 방법을 적용하였다.

• 품질경영학회지
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• 제12권2호
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• pp.15-24
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• 1984

Since W.A. Shewhart (1931) developed the quality control method using the control chart, many theoretical and empirical works about such an analytical method have been done. However there are two major methods relating to the control chart analysis; the conventional 3 sigma control method and the warning limit method which has been suggested as a modification of the former. The conventional 3 sigma method requires to take a remedial action only when a quality characteristic is beyond the control limit (3 sigma). However, once a quality characteristic is over the control limit, searching and repairing an assignable cause requires time consuming job and high costs. Therefore if we set the warning limit between the central line and the control limit, we will be able to take remedial measures before too late. In spite of its advantage, much attention has not been paid to use the control chart with warning limit in Korean industries. The main object of this study is to examine improvement of quality and productivity when the control chart with warning limit is used.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 학술대회 논문집
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• pp.101-104
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• 2004

지금까지의 고조파 필터는 중성선 리액터와 이중 엇갈린 결선으로 영상고조파 전류를 제거하였으나 중성선 리액터 과열로 중성선 단선 위험의 문제가 발생하였다. 본 중성선 Open Delta 방식은 이중 엇갈린 결선의 Core Block내에 결선하여 중성선에 연결하면 중성선으로 흐르는 영상 고조파 분 전류를 과열 없이 안전하게 제거하고 중성선 고조파 부하 전류량에 관계없이 완전하게 제거되는 것을 시험 분석한 결과로 가장 효과적인 고조파 저감 대책을 개선사례로 제시하여 관련선로에 도움이 되고자 한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.273-274
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• 2008

According to current RRC procedures, network does not know either how long it will take the RRC reconfiguration message (such as Physical Channel Reconfiguration (PCR)/Transport Channel Reconfiguration (TCR)/Radio Bearer Reconfiguration (RBR)) to be transmitted over the source cell or how long the UE will take to reconfigure on receiving the message, it has to assume the worst-case. Thus, it typically indicates a conservative activation time, leading to potentially large interruption for voice traffic, particularly if the source cell signal strength has degraded. This proposals allow the UE to receive the serving cell related information (carried today in PCR/RBR/TCR message) in an Active Set Update message.

• International Journal of Internet, Broadcasting and Communication
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• 제9권1호
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• pp.29-34
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• 2017

Over the past several decades, embedded system and flight control computer technologies have been evolved to meet the diverse needs of the mobile device market. Current embedded systems are at the heart of technologies that can take advantage of small-sized specialized hardware while still providing high-efficiency performance at low cost. One of these key technologies is multiple memory banks. For example, a dual memory bank can provide two times more memory bandwidth in the same memory space. This benefit take lower cost to provide the same bandwidth. However, there is still few software technologies to support the efficient use of multiple memory banks. In this study, we present a technique to efficiently exploit multiple memory banks by software support. Specifically, our technique use an interference graph to optimally allocate data to different memory banks by an optimizing compiler. As a result, the execution time can be improved upto 7% with the proposed technique.