• YAKHAK HOEJI
• /
• v.37 no.4
• /
• pp.356-361
• /
• 1993

A sensitive method for the determination of methamphetamine(MA) and amphetamine(AM) in hair was developed by gas chromatography/mass spectrometry using stable isotope-labeled internal standards, amphetamine-d$_{5}$ and methamphetamine-d$_{5}$. Hair sample was washed with MeOH, incubated with MeOH(I% HCI) overnight at $37^{\circ}C$ while stirring and extracted using solid phase extraction column on a vacuum manifold. The extract obtained was pentafluoropropionated, and applied to GC/MS. The calibration curves of MA and AM were linear from 2.5 to 250 ng (r>0.99 for both). The limit of detection was 0.1 ng/mg in hair and cut-off level was set at 0.25 ng/mg for both. Hair samples of 27 MA abusers showed positive results in the range 0.7 to 106.8 ng/mg. AM, its metabolite, was detected in 20 out of 27 samples. The ratio of MA versus AM was 4.6~38.3 in specimens. Hair analysis for methamphetamine by GC/MS is an effective method for identifying long-term drug abusers.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2005.11a
• /
• pp.66-70
• /
• 2005

Noise prediction are required as part of an environmental impact assessment. Prediction method that is used to domestic environmental impact assessment of construction site and industrial site is not applied work operation rate, work position, moving noise source, inner traffic flow, work type and height of noise source etc. The BS5228 methodology is used mainly for assessment of proposed open industrial sites(mineral extraction, landfill etc.), and larger long-term construction sites(typically for major infrastructure projects). also, estimation which consider various effect factor is possible.

• Journal of Information Management
• /
• v.23 no.2
• /
• pp.1-13
• /
• 1992

This study intends to measure the indexibility and the information quantity in title and abstract. The result of analysis was that when the source was title or abstract, result was not good. But when it was the title and abstract, the result was better.

• Proceedings of the Korean Information Science Society Conference
• /
• 2004.04b
• /
• pp.892-894
• /
• 2004

분야연상어는 어휘자체가 분야정보를 가지므로 인간이 분야를 인지할 때와 유사하게 문서의 분야를 판단한다. 인간이 한국어와 일본어의 180분야로 분류한 약 15,000개의 문서뱅크를 수집하고, 수집된 문서에서 복합어로 구성된 분야연상어의 효율적인 추출 알고리즘을 제안한다. 제안된 알고리즘으로 자동구축된 분야연상어를 문서분류의 초기결정에 이용할 수 있다. 분야연상어를 이용하면 어떠한 분야체계에도 손쉽게 적용할 수 있으므로 문서분류용 목적으로 이용할 수 있는 보편성은 충분하다.

• Korean Journal of Remote Sensing
• /
• v.24 no.3
• /
• pp.267-272
• /
• 2008

Tree species-specific estimates with spacebome high-resolution imagery improve estimation of forest biomass which is needed to predict the long term planning for the sustainable forest management(SFM). This paper is a contribution to develop crown distinguishing coniferous species, Pinus densiflora and Pinus koraiensis, from QuickBird imagery. The proposed feature analysis derived from shape parameters and first and second-order statistical texture features of the same test area were compared for the two species separation and delineation. As expected, initial studies have shown that both formfactor and compactness shape parameters provided the successful differentiating method between the pine species within the compartment for single crown identification from spaceborne high resolution imagery. Another result revealed that the selected texture parameters - the mean, variance, angular second moment(ASM) - in the infrared band image could produce good subset combination of texture features for representing detailed tree crown outline.

• Structural Engineering and Mechanics
• /
• v.19 no.2
• /
• pp.123-139
• /
• 2005

An automatic modal identification program is developed for continuous extraction of modal parameters of three cable-supported bridges in Hong Kong which are instrumented with a long-term monitoring system. The program employs the Complex Modal Indication Function (CMIF) algorithm for identifying modal properties from continuous ambient vibration measurements in an on-line manner. By using the LabVIEW graphical programming language, the software realizes the algorithm in Virtual Instrument (VI) style. The applicability and implementation issues of the developed software are demonstrated by using one-year measurement data acquired from 67 channels of accelerometers permanently installed on the cable-stayed Ting Kau Bridge. With the continuously identified results, variability in modal vectors due to varying environmental conditions and measurement errors is observed. Such an observation is very helpful for selection of appropriate measured modal vectors for structural health monitoring use.

• Journal of the Korea Society of Computer and Information
• /
• v.23 no.11
• /
• pp.31-41
• /
• 2018

Text classification has been studied for a long time in the Natural Language Processing field. In this paper, we propose an article- and paragraph-level genre classification system using Word2Vec-based LSTM, GRU, and CNN models for large-scale English corpora. Both article- and paragraph-level classification performed best in accuracy with LSTM, which was followed by GRU and CNN in accuracy performance. Thus, it is to be confirmed that in evaluating the classification performance of LSTM, GRU, and CNN, the word sequential information for articles is better than the word feature extraction for paragraphs when the pre-trained Word2Vec-based word embeddings are used in both deep learning-based article- and paragraph-level classification tasks.

• Current Optics and Photonics
• /
• v.2 no.6
• /
• pp.547-553
• /
• 2018

In this paper, a new method for spatial filtering in digital holography is proposed and verified by simulations compared to conventional methods. The new method is based on the simultaneous acquisition of two digital holograms, which can be separated by distinct spatial modulation, in a single image. Two holograms are generated by two reference waves, which have different spatial modulation orientations. Then, the overlapping region between the DC term and the object wave in the first hologram can be replaced with a less-overlapping region of the object wave in the second hologram because the whole image contains two holograms where the same objective wave has been recorded. In the simulation results, it is confirmed that the reconstructed image by the new method has better quality than for the original method.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2019.07a
• /
• pp.273-276
• /
• 2019

본 논문에서는 열 및 전기특성 플라스틱 복합수지와 한글에 특화된 인공지능 기술을 개발하기 위한 조성/물성 정보 복합수지 지식베이스를 구축하고자 국내 특허 문헌에서 화학 용어를 추출하고자 한다. 이를 위해 전문용어가 많이 쓰인 특허 문헌의 특수성을 고려하여 UIMA(Unstructured Information Management Architecture) 규칙 기반의 라이브러리를 사용해 한국어 화학 용어 코퍼스를 구축하고 이를 기반으로 딥러닝 알고리즘 중 하나인 Bidirectional LSTM-CRF를 기반으로 특허 문헌에서 화학 용어를 자동으로 추출하는 알고리즘을 연구하고자 한다.

• Journal of the Korean Academy of Esthetic Dentistry
• /
• v.27 no.1
• /
• pp.4-17
• /
• 2018

Extraction of highly injured teeth in the maxillary anterior teeth and implants restoration is almost good choice, lastly, you tried to save highly injured teeth is a good choice if you have a trust relationship between the dentist and the patient. If the dentist and the patient work together to achieve long-term maintenance, they will create a thicker trust relationship.