• 말소리와 음성과학
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• 제1권3호
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• pp.109-115
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• 2009

Many isolated word recognition systems may generate non-similar words for recognition candidates because they use only acoustic information. In this paper, we investigate several techniques which can exclude non-similar words from N-best candidate words by applying Levenstein distance measure. At first, word distance method based on phone and syllable distances are considered. These methods use just Levenstein distance on phones or double Levenstein distance algorithm on syllables of candidates. Next, word similarity approaches are presented that they use characters' position information of word candidates. Each character's position is labeled to inserted, deleted, and correct position after alignment between source and target string. The word similarities are obtained from characters' positional probabilities which mean the frequency ratio of the same characters' observations on the position. From experimental results, we can find that the proposed methods are effective for removing non-similar words without loss of system performance from the N-best recognition candidates of the systems.

• 대한공간정보학회지
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• 제17권1호
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• pp.97-104
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• 2009

지적도근점과 도시기준점은 설치의 목적과 성격은 다르지만 측량방법, 매설 위치 등이 매우 유사하다. 그렇기 때문에 두 기준점을 연계하여 활용할 수 있다면 도근점 망실에 의한 복구비용의 최소화는 물론 배점밀도의 향상을 가져올 수 있을 것이다. 따라서 본 연구에서는 지적도근점을 기초로 도시기준점의 위치정확도를 분석하여 봄으로써 두 기준점을 연계하여 활용할 수 있는 가능성을 제시하고자 하였다. 연구결과는 다음과 같다. 연구대상지역 총 13점의 도시기준점의 위치정확도를 분석하여 본 결과, 각각의 측점에 대한 연결오차의 RMSE가 최소 ${\pm}8cm$에서 최대 ${\pm}11cm$ 오차를 보이는 것으로 나타났다. 이러한 결과는 현행 지적법에서 규정하고 있는 허용오차 범위내의 성과로 지적도근점과 도시기준점을 연계하여 이용할 수 있는 가능성을 확인할 수 있었다.

• Spatial Information Research
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• 제7권1호
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• pp.119-131
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• 1999

국내 1:1,000과 1:5,000수치지도의 제작이 완성단계에 이르고 다양한 목적에의 활용이 예상됨에 따라 제작된 수치지도의 위치정확도가 주요한 이슈로 부각되고 있다. 제작자의 측면에서 뿐만 아니라 사용자의 측면에서도 수치지도의 위치정확도는 사용목적에 따른 판단의 기준으로 중요한 의미를 갖는다. 기존 수치지도 위치정확도 측정방법은 대부분 표본점의 추출에 의한 통계량 분석에 기초하고 있으며, 최근에 소개된 선형사상의 위치정확도 측정방법도 실폭으로 표현되는 국내 수치지도 도로사상의 정확도 측정에는 적용하기가 어려운 단점이 있다. 본 연구에서는 1:5,000 수치지도의 도로사상에 대한 위치정확도를 측정할 수 있는 방법과 절차를 개발하고 모든 과정을 상용 GIS 소프트웨어를 이용하여 구현하였다. 또한 사례지역으로 서울시 강남구 일부지역을 선정하여 도로사상의 위치정확도를 분석하였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.305-308
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• 2005

Linear motor has been developed for linear motion of machine tools. Linear motor is useful to design the linear motion, high speed and high accuracy, because of the simple system not required the additional mechanical part such as coupling and ballscrew. This paper tested performance of linear motor such as velocity response, position tracing performance, subordinate Traction force change and positional accuracy.

• Nuclear Engineering and Technology
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• 제55권5호
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• pp.1718-1733
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• 2023

The virtual Frisch-grid method for room-temperature radiation detectors has been widely used because of its simplicity and high performance. Recently, side electrodes were separately attached to each surface of the detectors instead of covering the entire detector surface with a single electrode. The side-electrode structure enables the measurement of the three-dimensional (3D) gamma-ray interaction in the detector. The positional information of the interaction can then be utilized to precisely calibrate the response of the detector for gamma-ray spectroscopy and imaging. In this study, we developed a 3D position-sensitive 5 × 5 × 12 mm³ cadmium-zinc-telluride (CZT) detector and applied a flattening method to correct detector responses. Collimated gamma-rays incident on the surface of the detector were scanned to evaluate the positional accuracy of the detection system. Positional distributions of the radiation interactions with the detector were imaged for quantitative and qualitative evaluation. The energy spectra of various radioisotopes were measured and improved by the detector response calibration according to the calculated positional information. The energy spectra ranged from 59.5 keV (emitted by ²⁴¹Am) to 1332 keV (emitted by ⁶⁰Co). The best energy resolution was 1.06% at 662 keV when the CZT detector was voxelized to 20 × 20 × 10.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.323-324
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• 2010

• 수산해양기술연구
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• 제22권4호
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• pp.83-89
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• 1986

A series of observations was conducted in order to study the accuracy of the Jlosition by automatic Loran-C navigation system with two Loran-C chains, namely 5970 and 9970 Chain, in the EJst Sea and Southern Sea of the Korean Peninsular from July to September 1986. Diurnal variation of positional error measured by 5970 Chain was almost stable throughout a whole day, and it was fairly stabl2 in the daytime but fluctuated more or less by night at each station by 9970 Chain. Daily mean values of positional error by 5970 Chain were 6'.44 SWat U1reungdo, 0'.22 SE at Jugbyeon, 0'.91 NE at Guryongpo, 0'.37 SE at Pusan, 0'.30 SE at Yokchi, 0'.37 NW at Cheju and 12'.51 SE at Taeheuksan. By 9970 Chain, they Wer2 0'.27 SWat Ulreungdo, 0'.27 SE at Jugbyeon, 0'.09 SWat Guryongpo, 0'.19 SE at Pusan, 0'. IG SE at Yokchi, 0'.17 Sr:: at Cheju and 0'.52 SE at Taeheuksan.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.20-24
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• 1997

In general, pantograph type manipulators are used for carrying heavy payloads with positional accuracy. In this paper, a double pantograph type manipulator, activated by two slider joints, is studied for applying to file handing machine in atomic power plant. In order to realize the stable horizontal movement of a heavy fuel rod whit good positional accuracy, methods for allocating slider and finding constant joint rates are proposed. In addition, the static deflection of the proposed mechanism was studied using transfer-stiffness matrix method. A neural network control algorithm which compensates static deflections is explored with computer simulations.

• 말소리와 음성과학
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• 제8권1호
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• pp.19-24
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• 2016

The Korean high back vowels /o/ and /u/ have been reported to be in a state of near-merger especially among young female speakers. Along with cross-generational changes, the vowel position within a word has been reported to render different phonetic realization. The current study examines native English speakers' ability to attend to the phonetic cues that distinguish the two merging vowels and the positional effects (word-initial vs. word-final) on the identification accuracy. 28 two-syllable words containing /o/ or /u/ in either initial or final position were produced by native female Korean speakers. The CV part of each target word were excised and presented to six native English speakers. The results showed that although the identification accuracy was the lowest for /o/ in word- final position (41%), it increased up to 80% in word-initial position. The acoustic analyses of the target vowels showed that /o/ and /u/ were differentiated on the height dimension only in word-initial position, suggesting that English speakers may have perceived the distinctive F1 difference retained in the prominent position.

• 한국정밀공학회지
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• 제13권1호
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• pp.98-107
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• 1996

The use of composite hyperpatch model is proposed to predict a machine tool positional error over the entire work space. This is an appropriate representation of the distorted work space. This model is valid for any configuration of 3-axis machine tool. Tool position, which is given NC data or CL data, contains error vector in actual work space. In this study, off-line compensation scheme was investigated for tool position error due to inaccuracy in machine tool structure. The error vector in actual work space is corrected by the error model using Newton-Raphson method. The proposed error compensation method shows the possibility of improving machine accuracy at a low cost.