• Applied Biological Chemistry
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• v.51 no.4
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• pp.321-328
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• 2008

The research was conducted to identify the antimicrobial effect, anti-oxidative effect and tyrosinase inhibitory effect of MeOH 80% extract and n-hexane, chloroform, ethyl acetate, n-butanol and water fractions from the extract of six kinds of compositae plants, which are naturally grown across the nation. In the antimicrobial effect, the extract and chloroform fraction of Arctium lappa and hexane/ethyl acetate fractions of Taraxacum platycarpum exhibited significant inhibition. In case of antioxidant effect, the extract of Artemisia capillaries showed the highest effect and ethyl acetate/butanol fractions of all plants showed about 90%, which fractions were more polar than the fractions that showed antimicrobial effect. In case of tyrosinase activity, only the MeOH 80% of Arctium lappa among the extracts showed a potent inhibition, and butanol fraction of Chrysanthemum indicum, as well as ethyl acetate/water fractions of Artemisia capillaries showed 48, 38, and 37% respectively, which were higher than control group (arbutin). These active fractions in tyrosinase inhibition also were higher polarity than those that showed antimicrobial effect. In MeOH 80% extracts, only Arctium lappa was found to have antimicrobial, anti-oxidant and tyrosinase inhibitory activity, however there was no fraction to show effects commonly in the three assay system.

• Korean journal of applied entomology
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• v.24 no.1 s.62
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• pp.25-28
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• 1985

Experiments were carried out to investigate the life cycle of the rice leaf beetle (RLB), (Oulema oryzae KUWAYAMA) ,yield losses by its damages, and control method in $1976{\sim}1983$ at the experimental field of Gangweon PORD. Peak occurrence of adult and larva rice beetle was late May and mid-June, respectively. Adult overwintered in the forest of mountain and move into the paddy field to lay eggs on the rice leaf from late seedling stage. A female adult laid eggs for 2 days, and egg, larval and pupal period was 9, 16, and 9 days, respectively. Leersia japonica MAKINO was damaged slightly by the beetle. The yield reduction by artifical defoliation ranged from 6 to 40% and yield reduction increased as leaf feeding delayed until mid-July. All insecicides show 100% of control value against RLB.

• Journal of Korea Spatial Information System Society
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• v.10 no.2
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• pp.63-79
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• 2008

With the recent development of advanced GIS and complex spatial analysis technologies, the more sophisticated technologies are being required to support the advanced knowledge for solving geographical or spatial problems in various decision support systems. In addition, necessity for research on scientific crime investigation and forensic science is increasing particularly at law enforcement agencies and investigation institutions for efficient investigation and the prevention of crimes. There are active researches on geographic profiling to predict the base location such as criminals' residence by analyzing the spatial patterns of serial crimes. However, as previous researches on geographic profiling use simply statistical methods for spatial pattern analysis and do not apply a variety of spatial and temporal analysis technologies on serial crimes, they have the low prediction accuracy. Therefore, this paper identifies the typology the spatio-temporal patterns of serial crimes according to spatial distribution of crime sites and temporal distribution on occurrence of crimes and proposes STA-BLP(Spatio-Temporal Analysis based Base Location Prediction) algorithm which predicts the base location of serial crimes more accurately based on the patterns. STA-BLP improves the prediction accuracy by considering of the anisotropic pattern of serial crimes committed by criminals who prefer specific directions on a crime trip and the learning effect of criminals through repeated movement along the same route. In addition, it can predict base location more accurately in the serial crimes from multiple bases with the local prediction for some crime sites included in a cluster and the global prediction for all crime sites. Through a variety of experiments, we proved the superiority of the STA-BLP by comparing it with previous algorithms in terms of prediction accuracy.

• Journal of the Korean earth science society
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• v.28 no.2
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• pp.202-213
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• 2007

The Odaesan earthquake $(M_L=4.8)$ occurred near Mt. Odae, Jinbu-Myon, Pyongchang-Gun, Kangwon Province on January 20, 2007. It has a shallow focal depth about 10 km. Its felt area covers most of the southern peninsula except some southern and western inland area. The maximum MM intensity was VI in the areas including Jinbu, Doam, Kangreung, Jumunjin, and Pyongchang. In these areas, there was a very strong shaking that caused several cracks on the walls of buildings and houses, slates falling off the roof, tiles being off the wall, things falling off the desk, and rock falling from the mountains. In order to get fault plane solutions, grid searches were performed by fitting distributions of P-wave first-motion polarities and SH/P amplitude ratios for each event. The results showed that the main shock represented right-lateral strike-slip sense and two aftershocks, reverse sense. It seems that the seismogenic fault may be the NNE-SSW trending Weoljeongsa fault near the epicenter based on the distribution of epicenters (foreshock, main shock, and aftershocks), damage area, and fault plane solution. The distribution of the epicenters indicates that the length of the subsurface rupture is estimated to be about 2 km.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.8
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• pp.703-710
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• 2016

In robotics research, accurate estimation of current robot position is important to achieve motion control of a robot. In this research, we focus on a sensor fusion method to provide improved position estimation for a wheeled mobile robot, considering two different sensor measurements. In this case, we fuse camera-based vision and encode-based odometry data using Kalman filter techniques to improve the position estimation of the robot. An external camera-based vision system provides global position coordinates (x, y) for the mobile robot in an indoor environment. An internal encoder-based odometry provides linear and angular velocities of the robot. We then use the position data estimated by the Kalman filter as inputs to the motion controller, which significantly improves performance of the motion controller. Finally, we experimentally verify the performance of the proposed sensor fused position estimation and motion controller using an actual mobile robot system. In our experiments, we also compare the Kalman filter-based sensor fused estimation with two different single sensor-based estimations (vision-based and odometry-based).

• Journal of KIISE:Software and Applications
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• v.37 no.12
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• pp.882-891
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• 2010

Many automated dynamic test data generation technique have been proposed. The techniques evaluate fitness of test data through executing instrumented Software Under Test (SUT) and then generate new test data based on evaluated fitness values and optimization algorithms. Previous researches and experiments have been showed that these techniques generate effective test data. However, optimization algorithms in these techniques incur much time to generate test data, which results in huge test case generation cost. In this paper, we propose a technique for reducing the time of evaluating a fitness of test data among steps of dynamic test data generation methods. We introduce the concept of Fitness Evaluation Program (FEP), derived from a path constraint of SUT. We suggest a test data generation method based on FEP and implement a test generation tool, named ConGA. We also apply ConGA to generate test cases for C programs, and evaluate efficiency of the FEP-based test case generation technique. The experiments show that the proposed technique reduces 20% of test data generation time on average.

• Korean Journal of Food Science and Technology
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• v.31 no.3
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• pp.815-822
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• 1999

Twenty one flavonoids were isolated from ethyl acetate layer of aqueaus EtOH extracts of Artemisia vulgaris and identified as tricin, jaceosidine, eupafolin, diosmetin, chrysoeriol, homoeriodictyol, isorhamnetin, apigenin, eriodictyol, luteolin, luteolin 7-glucoside, kaempferol 3-glucoside, kaempferol 7-glucoside, kaempferol 3-rhamnoside, kaempferol 3-rutinside, quercetin, quercetin 3-glucoside, quercetin 3-galactoside, quercetrin, quercetin 7-glucoside, rutin, and vietexin. The inhibitory activity for all purified flavonoids were examined against lipid peroxidation in rat liver microsome. All examined flavonoids showed considerable antioxidant activity. Among them, $IC_{50}$ value of apigenin, luteolin, isorhamnetin, quercetin, and eriodictyol were showed higher than that of vitamin E used as positive control. And methoxylated flavonoids, tricin, eupafolin, jaceosidine, diosmetin, and isorhamnetin showed considerable antioxidant activity. Each $IC_{50}$ values were shown at 0.9, 1.0, 1.4, 1.0, and $0.7\;{\mu}g/mL$, respectively.

• The Korean Journal of Zoology
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• v.31 no.1
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• pp.11-20
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• 1988

A comparison between two species of Hyla japonica and H. suweonesis in Korea was carried out to clarify their morphological, genetic and ecological differences, to estimate presumed divergent time between them, and to elucidate their probable process and mechanism of speciation. The results are as follows; 1.The breeding season of H. japonica was earlier than that of H. suweonensis about one and half months. 2.H.japonica was distributed all over the country, while H. suweonensis was restricted in Kyonggi plains. 3.On the extemal morphometric characters, differences were hardiy seen between two species. But on the discriminant function analysis, there was apparent differences between them. 4.Genic variation based on 24 loci showed that H. japonica populations were about two fold more variable than that of H. suweonensis populations. 5.Genetic relatedness between two species was rather remote (S =0.520, D=0.634) 6.Their presumed divergent time was estimated to be about three and a quarter mfllon years. It is presumed that H. suweonensis was originated from H. japonica during the period of late pleocene and early pleistocene. 7.Premating isolating mechanisrns (breeding season, mating call, and microhabitat segregation) may be operating to prevent gene ifow between them.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1977.06a
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• pp.7.1-7
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• 1977

According to Bryce and Cranston, prolapse of the laryngeal ventricle is a protrusion of the ventricular mucosa into the laryngeal cavity from inflammatory hyperplasia or edema. This 53 year old female patient was admitted to our hospital March 11, 1977 with the chief complaints of dyspnea and hoarseness. On admission, evaluation of the larynx revealed smooth surfaced round pink-reddish mass protruding bilaterally beneath the false cord. The airway was almost completely obstructed by the tumor mass, but neither ulceration nor infiltration was seen, also no lymphnode was palpable in the neck. Tracheotomy was performed for the relief of dyspnea and biopsy was done endoscopically. Histologic study showed chronic inflammation. On April 2, 1977 laryngofissure was performed under general anesthesia. Laryngeal examination revealed smooth surfaced, plate like, pinkreddish mass protruding bilaterally from both laryngeal ventricles into the laryngeal cavity and extending the whole length of the ventricle antero-posteriorly and touching each other. Biopsy was taken of the mass and the result was non-specific inflammatory hyperplasia of the larynx. Postoperatively, the air way is completely clear of obstruction but mild hoarseness still remains. No recurrent mass is visible in the larynx. In view of the symptoms, operative findings and histological findings, this case is diagnosed as "Prolapse of the laryngeal ventricle". The prolapse of the laryngeal ventricle is a very rare lesion and is reported with review of the literature.

• Korean journal of applied entomology
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• v.3
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• pp.1-5
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• 1964

Symptom of the mosaic disease of black locust which is presently widespread in Korea was observed and transmission of the disease was investigated by means of grafting Since its symptom was typically mosaic and its transmission was easily accomplished, the disease was considered to be caused by a virus. In investigation of transmission by grafting, it was found out that the discase was easily transmitted in both of the following cases, i. e., healthy seedlings grafted with diseased scions and diseased roots with healthy scions. In the healthy seedlings plus diseased scions grafting, some grafted seedlings were purposedly deprived of the diseased scions after, a certain length of time(10∼30 days), while some were left grafted. The former case showed much higher transmission rate than the latter case, but no fluctuation in rate of transmission by the length of contact period(10-30 days) was recognized. And even when the union between stock and diseased scion by callusing was not successful, the transmission was withnesed. On the basis of the symptom, transmission by grafting, and possibility of transmission by sap inoculation(not published yet), it is supposed that the mosaic virus belongs to the group of the black locust mosaic virus that has been reported in southeastern Europe by Atanasoff(1935) and Milinko et al(1961). It is very likely that the witches' broom of black locust recorded by Myung-O Kim et al(1961) in Korea is the mosaic disease.