• Journal of the Korean Society of Systems Engineering
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• v.10 no.1
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• pp.57-64
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• 2014

We propose a methodology to automatically extract the requirements from the documents and check the traceability between them. The documents include not only the text file but also PDF or image files. We also suggest a method to visualize the result with maps, numbers, and graphs. By comparing the results with those of expert reviews, we show that it is necessary to use knowledge-based method in future instead of the word-based method for improving the reliability. The results give more values when they are applied in already existing documents than those of newly developed product.

• Journal of the Korean Chemical Society
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• v.6 no.2
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• pp.99-103
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• 1962

The usefulness of a propionylated paper chromatography to the identification of various insoluble organic antioxidants in rubber vulcanizates was studied. Purified commercial antioxidants and commercially mixed antioxidants could be identified by the propionylated paper chromatography. Antioxidants were identified by the propionylated paper chromatography from acetone extract of pure gum vulcanizates, which were either unaged or aged in Geer-Oven. The $R_f$ values from acetone extracts of vulcanizates were a little lower than those purified samples, but the colours and shapes of the spots support the identification. No spot could be obtained by the method from the aged vulcanizate containing antioxidant 200 (2,6 Di-tert-butyl-p-cresol). This indicates that the antioxidant was converted or decomposed to other compound after aging. It was concluded from the above results that the propionylated paper chromatography is useful to identify the antioxidants from vulcanizates and presents a key for elucidating the mechanism of the inhibition.

• Journal of Advanced Marine Engineering and Technology
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• v.30 no.8
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• pp.919-926
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• 2006

To move in unknown or uncertain environment, a mobile robot must collect informations from various sensors and use it to construct a representation of the external world. Ultrasonic sensor can provide range data for this purpose in a simple cost-effective way. However conventional ultrasonic sensor system for a mobile robot are not sufficient for environment recognition because of their large beam opening angle, specular reflection. This paper describe on environmental perception algorithm which can solve these problems in case using ultrasonic sensor. The algorithm consist of two parts. One is to solve beam opening angle problem by fusion from multiple ultrasonic sensors. The other is to cope with specular reflection problem in wall line extract, which is based on Hough Transform. Experiments to verify the validity of the proposed algorithm are carried out, and the results are provided at last part in this paper.

• Korean Journal of Computational Design and Engineering
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• v.20 no.4
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• pp.328-336
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• 2015

We proposed a methodology to automatically extract the requirements from the documents and check the consistency and traceability among them. The documents include not only text but also PDF or image files. We also suggest a method to visualize the result with maps, numbers, and graphs. By comparing the results with those of manual reviews from experts, we show that it is necessary to use knowledge-based method in future instead of the wordbased method for improving the reliability. The results can be applied effectively for already existing documents.

• Restorative Dentistry and Endodontics
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• v.37 no.4
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• pp.228-231
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• 2012

Invasive cervical resorption is a relatively uncommon form of external root resorption. It is characterized by invasion of cervical region of the root by fibrovascular tissue derived from the periodontal ligament. This case presents an invasive cervical resorption occurring in maxillary lateral incisor, following damage in cervical cementum from avulsion and intracoronal bleaching procedure. Flap reflection, debridement and restoration with glass ionomer cement were performed in an attempt to repair the defect. But after 2 mon, more resorption extended apically. Considering root stability and recurrence potential, we decided to extract the tooth. Invasive cervical resorption in advanced stages may present great challenges for clinicians. Therefore, prevention and early detection must be stressed when dealing with patients presenting history of potential predisposing factors.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.19 no.6
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• pp.575-582
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• 2009

This study presents the vibration excitation system to extract the aerodynamic stability derivatives which is generally called as flutter derivatives in civil engineering. The system consists of the excitation part to give a forced harmonic motion to the model and the sensing part to measure the aerodynamic forces as well as inertia forces acting on a bridge model. A data processing algorithm for extracting the flutter derivatives from the measured forces is also presented. From the wind tunnel tests, verification of present system was done by comparing the measured and analytical results for rectangular shaped model. The effects of excitation frequencies and amplitudes on flutter derivatives are discussed. Five kinds of actual bridge model were presented from the wind tunnel.

• Journal of Pharmaceutical Investigation
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• v.15 no.4
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• pp.179-185
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• 1985

Total ethanol extract of chinese drugs was administered to mice for 4 weeks (small dosage group) and 3 days (large dosage group), and its antifatigue effects and hepatonic activities were compared with those of P. ginseng and A. sessiliflorum. 1. In the long-term administration of extracts, the swimming performance peaked at 2 weeks, and the recovery effects on the intoxicated liver appeared to be significant in the extracts of P. officinale, P. cocos and A. cochinchinensis among tested chinese drugs. 2. The large dose administration of extracts gave high improvement of recovery effect on the intoxicated liver.

• Journal of the Korean Applied Science and Technology
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• v.28 no.2
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• pp.196-202
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• 2011

Coumarin derivatives were shown to possess valuable pharmacological properties such as anticancer/anti carcinogenic, anti-inflammatory, anti helicobacter, anti genotoxic, neuroprotective and dietary effect. In this study, novel coumarin derivatives structurally related to 7-geranyloxycoumarin were effectively synthesised in good yields by $Cs_2CO_3$/acetonitrile in mild condition. The synthesis of geranyloxycoumarin derivatives in weak base($Na_2CO_3$, $K_2CO_3$, $Cs_2CO_3$ etc)/$CH_3CN$ at room temperature obtained in good yield. On the other hand, the reaction of geranyloxycoumarin formation in strong base(NaOH, KOH, CsOH etc)/$CH_3CN$ at reflux condition obtained in low yield.

• Applied Biological Chemistry
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• v.39 no.4
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• pp.268-273
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• 1996

Fundamental data for new type of product development from Lycii fructus was experimentally determined. The chemical composition, and Hunter value changes, optimum extraction, volatile components of extract under different extraction conditions and heat treatment were mainly studied. Results are summarized as follows. The proximate compositions of dried Lycii fructus were water 21.8%, total sugar 27.6%, reducing sugar 15.2%, crude protein 14.29%, crude fat 5.65%, crude fiber 7.48%, and ash 7.98% in percent stale, respectively. Extracted yield on the basic of solid extract was getting increased when more solvent was used for extraction. The most recommendable extraction was 1 to 10 part of sample to solvent ratio. When water was employed as extraction solvent, the highest amount of solid extract was obtained. Extract of Lycii fructus in terms of yields and color was most acceptable when raw sample was treated 8 minute roasting at $180^{\circ}C$ and 60 minute heating at $120^{\circ}C$, respectively. Major volatile components of fresh Lycii fructus were to hexadecanoic acid, methyl linoleate, benzyl alcohol, dimetane benzene by GC/MS. By the roasting of raw sample, the compounds of 2-methyl-2buthenal, 1,4-dimethyl benzene, and benzyl alcohol were reduced. Wheras, methyl thiopropanol, benzene acetaldehyde and ethyl linoleate were slightly increased.

• The Korean Journal of Mycology
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• v.14 no.2
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• pp.149-163
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• 1986

To determine contents of general constituents of Ganoderma lucidum in Korea, the dried carpophores were analyzed. The contents of water, ash, crude lipid, crude protein and crude cellulose were 14.6, 2.0, 3.3, 23.6, and 59.0%, respectively. Among reducing sugars, maltose was the most abundant. Seventeen free amino acids were detected, showing alanine the highest value. The pH of hot water extract was 4.1-4.2. The spores of Ganoderma lucidum was flat and ovoidal long. Their size was $6.3-7.1{\times}3.5-4.3{\times}2.0-2.5\;{\mu}m$ long. To examine effects of life span against sarcoma-180 cells, Fractions A, B and C, were obtained from the extract of Ganoderma lucidum. The survival rates of Fractions A, B and C were 131.7, 162.5, and 141.7 %, respectively. In addition, to examine effects of Fraction B on cell-mediated immunity, delayed type hypersensitivity (=DTH) test was conducted. It restored the suppressed DTH in the sarcoma-180 bearing group up to 66.7%.