• 정보처리학회논문지B
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• 제10B권7호
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• pp.823-828
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• 2003

이 논문의 주요 목적은 내용을 기반으로 하는 이미지 검색에서 이미지 객체의 외형특징을 추출하는 방법을 제시하는 것이다. 대부분의 실질적인 객체들의 외형은 불규칙적이고, 이러한 객체를 수치화하기위한 일반적인 방법은 없다. 특히 전자 카타로그들은 상품들을 나타내는 많은 이미지를 포함하고 있다. 이 논문에서는 이미지 전체가 아닌 이미지내의 개별 객체들을 기반으로 특징을 추출하는 방법을 제시한다. 왜냐하면 제시된 방법은 한 이미지내에서 RLC lines을 사용하여 각 객체들의 외형을 기반으로하는 방법을 사용하기 때문이다. 실험결과는 일반적으로 가장 많이 사용하는 특징인 Texture와 비교를 했고 제시된 외형을 나타내는 변수들이 전자카타로그의 이미지 객체들을 뚜렷하게 나타냈고, 보다 정확하게 객체들을 분류하고 구별하였다.

• Journal of Positioning, Navigation, and Timing
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• 제7권4호
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• pp.189-203
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• 2018

In this paper, a Software Defined Radio (SDR) architecture was designed and implemented for rapid prototyping of GNSS receiver. The proposed SDR can receive various GNSS and direct sequence spread spectrum (DSSS) signals without software modification by expanded input parameters containing information of the desired signal. Input parameters include code information, center frequency, message format, etc. To receive various signal by parameter controlling, a correlator, a data bit extractor and a receiver channel were designed considering the expanded input parameters. In navigation signal processing, pseudorange was measured based on Coordinated Universal Time (UTC) and appropriate navigation message decoder was selected by message format of input parameter so that receiver position can be calculated even if SDR is set up various GNSS combination. To validate the proposed SDR, the software was implemented using C++, CUDA C based on GPU and USRP. Experimentation has confirmed that changing the input parameters allows GPS, GLONASS, and BDS satellite signals to be received. The precision of the position from implemented SDR were measured below 5 m (Circular Error Probability; CEP) for all scenarios. This means that the implemented SDR operated normally. The implemented SDR will be used in a variety of fields by allowing prototyping of various GNSS signal only by changing input parameters.

• 영어영문학
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• 제57권4호
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• pp.675-693
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• 2011

In its restricted sense, 'sound poetry' refers to the poetic performance that rejects words and verbal meaning and instead foregrounds the aural materiality of poetry. Behind this seeking for materiality lies a quest for a 'language of presence,' which operates through a denial of signification toward an ideal of the Adamic tongue, a purely emotional and universal language. In the same light, it is argued that sound poetry is a unique and unrepeatable event devoid of meaning due to its directness to the body allowing no intervention of intellectual and semiotic process. But language may involve perceptual meaning as well as verbal or conceptual meaning ascribed to words. This implies that even though devoid of conceptual meaning by means of using grammatically non-articulated sounds, sound poetry cannot but have meaning whose articulation is differently, i.e., iconically made about the aural features of the sounds. Perceptual meaning is unavoidable because everything we are conscious of is a reduced form, a repeatable pattern that works as a sign. 'Language of presence' is then actually impossible, and therefore sound poetry should be seen rather as a fest of diverse perceptual meanings.

• 한국비블리아학회지
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• 제18권2호
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• pp.125-140
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• 2007

문화콘텐츠는 시간과 공간을 초월하여 사람과 사람을 연계하는 코드를 담고 있는 국가의 핵심 자원으로써 전 국민 누구나가 장애 없이 원하는 콘텐츠에 접근이 보장되도록 웹 서비스를 제공하여야 한다. 본 연구는 문화관광부 지원으로 운영되고 있는 문화포털, 예술로, 한국의 문향, 독립예술영화관, e뮤지엄 등을 웹 접근성 평가대상으로 선정하여, 자동평가 총 11개 평가지표와 수동평가 3개 영역의 총 13개 평가항목, 26개 평가지표를 기준으로 웹 접근성 평가를 수행하였다. 평가결과 문화콘텐츠의 웹 접근성 준수 수준은 아직 초기 단계로 평가되었다. 본 연구는 문화콘텐츠의 웹 접근성 제고를 위해 실행 가능한 사례 제시를 통하여 문화콘텐츠의 접근성 향상을 위한 방안을 제시하였다.

• 한국토양비료학회지
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• 제33권4호
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• pp.266-274
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• 2000

토양과 작물근계의 유용미생물을 이용하여 작물생산성을 증대하고 병충해의 생물학적 방제를 위해서는 토양-근계의 미생물군집을 분석하고 그 기능을 밝히는 것이 전제가 되어야한다. 그러나 희석평판법으로는 극히 일부분만이 배양된다는 점을 고려할 때, 생존하지만 배양 불가능한 미생물의 군집 분석도 반드시 병행할 필요가 있다. 따라서 본 연구에서는, 고추재배지의 토양, 근권토양, 근면의 세균군집 구조해석을 위해서, 배양을 거치지 않고 각 시료로부터 직접 DNA를 추출하여 PCR증폭, 16S rDNA cloning, sequencing, 계통 해석을 행했다. 그 결과, 토양중에는 근권세균보다 미지의 동정이 되지 않는 세균이 우점하고 있었다. 27 clones 중에서 16 clones이 그램음성세균의 대표격인 Proteobacteria였으며, 방선균 등이 속해있는 고(高) G+C 그램양성세균군은 1 clone이 검출되었다. 그 외는 CFB 군이 2 clones, Verrucomicrobia가 1 clone이었고, Nitrospira가 1 clone이었으며 4 clones은 어느 군에도 속하지 않았다.

• Structural Engineering and Mechanics
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• 제86권5호
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• pp.607-619
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• 2023

This study, it was tried to evaluate the asphalt behavior under tensile loading conditions through indirect Brazilian and direct tensile tests, experimentally and numerically. This paper is important from two points of view. The first one, a new test method was developed for the determination of the direct tensile strength of asphalt and its difference was obtained from the indirect test method. The second one, the effects of particle size and loading rate have been cleared on the tensile fracture mechanism. The experimental direct tensile strength of the asphalt specimens was measured in the laboratory using the compression-to-tensile load converting (CTLC) device. Some special types of asphalt specimens were prepared in the form of slabs with a central hole. The CTLC device is then equipped with this specimen and placed in the universal testing machine. Then, the direct tensile strength of asphalt specimens with different sizes of ingredients can be measured at different loading rates in the laboratory. The particle flow code (PFC) was used to numerically simulate the direct tensile strength test of asphalt samples. This numerical modeling technique is based on the versatile discrete element method (DEM). Three different particle diameters were chosen and were tested under three different loading rates. The results show that when the loading rate was 0.016 mm/sec, two tensile cracks were initiated from the left and right of the hole and propagated perpendicular to the loading axis till coalescence to the model boundary. When the loading rate was 0.032 mm/sec, two tensile cracks were initiated from the left and right of the hole and propagated perpendicular to the loading axis. The branching occurs in these cracks. This shows that the crack propagation is under quasi-static conditions. When the loading rate was 0.064 mm/sec, mixed tensile and shear cracks were initiated below the loading walls and branching occurred in these cracks. This shows that the crack propagation is under dynamic conditions. The loading rate increases and the tensile strength increases. Because all defects mobilized under a low loading rate and this led to decreasing the tensile strength. The experimental results for the direct tensile strengths of asphalt specimens of different ingredients were in good accordance with their corresponding results approximated by DEM software.

• Geomechanics and Engineering
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• 제22권2호
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• pp.133-142
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• 2020

The evolution of the mining-induced fracture network formed during longwall top coal caving (LTCC) has a great influence on the gas drainage, roof control, top coal recovery ratio and engineering safety of aquifers. To reveal the evolution of the mining-induced stress and fracture network formed during LTCC, the fracture network in front of the working face was observed by borehole video experiments. A discrete element model was established by the universal discrete element code (UDEC) to explore the local stress distribution. The regression relationship between the fractal dimension of the fracture network and mining stress was established. The results revealed the following: (1) The mining disturbance had the most severe impact on the borehole depth range between approximately 10 m and 25 m. (2) The distribution of fractures was related to the lithology and its integrity. The coal seam was mainly microfractures, which formed a complex fracture network. The hard rock stratum was mainly included longitudinal cracks and separated fissures. (3) Through a numerical simulation, the stress distribution in front of the mining face and the development of the fracturing of the overlying rock were obtained. There was a quadratic relationship between the fractal dimension of the fractures and the mining stress. The results obtained herein will provide a reference for engineering projects under similar geological conditions.

• 생물정신의학
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• 제1권1호
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• pp.40-59
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• 1994

The introduction of lithium salts for the treatment of mood disorder by Code in 1949 was a major therapeutic breakthrough. Yet it is far from the universal therpeutic agent in the treatment of mood disorders. Indeed, some acutely manic patients do not respond adeqately to lithium and some individuals experience breakthrough affective episodes during lithium maintenance. In the last decode, it has become c1ear that a significant number of patients with more highly recurrent disorders may require alternative or enhanced forms of prophylactic treatment. For these reasons, a variety of other drugs hove been employed for the treatment and prophylaxis of mood disorders. Efforts to develop new pharmacologic strategies for mood disorder hove included a diverse array of medications, ranging from potent benzodiazepines to novel neuroleptics and from anticonvulsants to calcium channel blockers. The anticonvulsants appear particularly useful in cases of dysphoric mania and rapid cycling state, subforms of bipolar disorder that respond quite poorly to conventional treatments. Among all of these new pharmacologic strategy, carbamazepine and sodium valproate have received the broadest clinical applications as maintenance therapies. The data documenting the short-term antimanic effectiveness of the calcium channel blocker verapamil and benzodiazepins such as clonazepam and lorazepam appear also promising. A number of other theoretically interesting, as well as clinically relevant therapies, which are not presently employed routinly, hove also been studied, including 2 blocker clonidine, atypical antipsychotic clozapine, cholinomimetics, 5-HT enhancers, thyroid and magnesium preparations. Now prophylaxis in mood disorder remains a considerable therapeutic challenge. Controlled testing of the prophylactic efficacy of compounds such as carbamazepine, valproic acid, and the calcium channel blockers represent important next step in the clinical trials for mood disorder.

• Geomechanics and Engineering
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• 제11권3호
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• pp.401-420
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• 2016

The stability of deep coal roadways with large sections and thick top coal is a typical challenge in many coal mines in China. The innovative Universal Discrete Element Code (UDEC) trigon block is adopted to create a numerical model based on a case study at the Dongtan coal mine in China to better understand the failure mechanism and stability control mechanism of this kind of roadway. The failure process of an unsupported roadway is simulated, and the results suggest that the deformation of the roof is more serious than that of the sides and floor, especially in the center of the roof. The radial stress that is released is more intense than the tangential stress, while a large zone of relaxation appears around the roadway. The failure process begins from partial failure at roadway corners, and then propagates deeper into the roof and sides, finally resulting in large deformation in the roadway. A combined support system is proposed to support roadways based on an analysis of the simulation results. The numerical simulation and field monitoring suggest that the availability of this support method is feasible both in theory and practice, which can provide helpful references for research on the failure mechanisms and scientific support designing of engineering in deep coal mines.

• 한국유통학회지:유통연구
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• 제3권1호
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• pp.71-98
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• 1998

This study aimed to investigate how such retailers as department stores, large discount stores, book wholesalers, and clothing wholesalers used information technology for the QR strategy and whether the QR strategy had an effect on performance with a focus on the pipeline strategy. For this purpose, the QR strategy was divided into transaction efficiency, supplier partnership, and customer detail strategy. The differences in performance and information technology were analyzed according to the fit of the pipeline strategy, such as internal focus, supplier focus, and customer focus, the business strategy which were used by the retailers. And, an attempt was made to investigate whether performance was raised according to the level of adopting information technology. The results can be summarized as allows. First, the adaptive level of information technology had an effect on performance. But, seeing that the explanatory power of the regression analysis on the effect of the adaptive level of information technology on performance was shown to be very weak, it is judged that the level of QR information technology in the responding firms was very low compared to that of foreign firms. Second, information technology used by the retailers included universal product code, bar coding, customer database, and information utilities. It was shown that the group of firms seeking the transaction efficiency QR strategy and the internal focus pipeline strategy had the higher level of information technology than the retailers seeking other customer detail QR strategy and the customer focus pipeline strategy and the retailers with inconsistent strategy. This indicates that the firm seeking to raise its internal efficiency has a high level of using information technology. At the end of the paper, managerial implication and future research directions were discussed.