• Environmental and Resource Economics Review
• /
• v.17 no.2
• /
• pp.349-379
• /
• 2008

Otters which are the nearly extinct feral animal as well as indicator species of ecological balance of river have a wide variety of public value. The objective of this paper is to estimate non-market value of preservation of otters' habitats in Cheongju Si and Cheong won Gun. In this research, the one-and-one-half bound dichotomize choice method as a contingent valuation methods is used to derive willingness to pay for the preservation of otters' habitats. 311 residents were surveyed to determine their recognition and willingness to pay for preservation of otters' habitats. The results show that the value of preservation of otters' habitats is 5,904 won per house and month.

• Korean Journal of Environmental Biology
• /
• v.25 no.4
• /
• pp.319-325
• /
• 2007

We monitored the butterfly community dynamics from March to October for the three years (2002, 2003, 2004). The study areas were consisted of the five sectors with pine forest (Pinus rigida) and mixed oak forests at Mt. Midong in Chungwongun, Chungchungbukdo, Korea. We found that the total numbers of butterfly species were 59 species and the total individuals were 1,513. There was no change the number of species (44 species) during the study period but the composition of species and the number of individuals were different such as 414, 561, and 538, respectively. The most abundant species were Minois dryas (25%) in 2002, Polygonia c-aureum (24%) in 2003, and P. c-aureum (22%) in 2004. On the contrary, the number of singleton species was 20 species in 2002, 15 species in 2003, and 15 species in 2004. We found that there was the seasonal difference in species composition of butterfly community. The species diversity of butterfly community was the highest at sector 4 and sector 5 and lowest at sector 2. Main reason of the butterfly dynamics was strongly supposed to the human activity. We could suggest that the butterfly monitoring study must be a good way to measure the change of butterfly habitats including anthropogenic activity and the natural disturbances.

• The Korean Journal of Zoology
• /
• v.39 no.1
• /
• pp.89-97
• /
• 1996

Songs of the Yellow-throated Bunting (Emberiza elegans) and the Gray-headed Bunting (Emberiza fucata) in allopatric populations in Gangnae-meon, Cheongwon-gun, Chungbuk in Korea, were recorded during the breeding season and analyzed in sound spectroraphs. Males of E. elegans and E. fucata were tested to investigate whether territorial males can discriminate between neighbor and stranger based on playback of natural and artificial song repertoires. In addition, E. fucata was stimulated by playback of only the individually specific section as well as of only the posterior portion of the song. Males of E. elegans were able to discriminate individually between neighbor and stranger in response to natural song repertoires, but they did not respond to playback of the artificial song repertoires of neighbor and stranger. Males of E. fucata were able to discriminate individually between neighbor and stranger in response to natural, artificial song repertoires, and the anterior section of the song, while males did not respond to playback of the posterior section of the song.

• Korean journal of applied entomology
• /
• v.51 no.2
• /
• pp.99-109
• /
• 2012

Seasonal fluctuations of Riptortus pedestris were investigated in four regions including two sites each at Mt. Yangseong (Munui-myeon, Cheongwon-gun), O-chang (Cheongwon-gun), and Jujung-dong (Cheongju) using aggression pheromone traps from April to November in 2010 and 2011. Aggression pheromone and aggression pheromone + soybean traps were set at all investigated sites, and the Mt. Yangseong A and B sites were investigated at a farmland (80 m, asl) and forest (200 and 300 m). The population density of R. pedestris was high in mid June, mid August, and late October in 2010 and in early May, mid June, mid September, and early October in 2011 with trivoltine. O-chang and Jujung-dong populations, which were distinguished in farmlands and forests, were highest from June to August in the farmland and in September in the forest. Similar numbers of R. pedestris were capture in the farmlands and the forest in June-August, September-November, respectively. From the results of the four regions, more R. pedestris adults were captured in the aggression pheromone + soybean trap than that in the pheromone trap. To investigate the migration route by altitude, 500 R. pedestris adults marked with fluorescent paint were released and re-caught insects were counted in traps after 10 and 20 days. The pattern of the re-caught R. pedestris indicated migration from the forest to farmlands during April-June. These results suggest that the insects did not migrate in August because food was plentiful in the forest at 200 m, but they moved to the forest during October due to the scarcity of food and for overwintering. The R. pedestris seasonal fluctuations in 2011 were affected heavily by the environment, particularly rain precipitation.

• The Journal of Engineering Geology
• /
• v.19 no.4
• /
• pp.517-528
• /
• 2009

Statistical analyses of cut-slope stability were performed over approximately 5.7 km section along the National road No. 25, which cross-cuts in NW-SE direction the Cheongwon and Boeun-Gun area, Chungbuk. A measure of slope-stability was established by using direct reinforcement and indirect protection methods in whole section. Orientations(dip/dip direction) of the slopes, foliations(bedding), cleavages and joints were measured in total of 30 slope sites. The results analyzed using stereographic projection indicate that major directions of the slopes come out predominantly in three directions: 1) $58^{\circ}/095^{\circ}$, 2) $60^{\circ}/296^{\circ}$ and 3) $59^{\circ}/212^{\circ}$. In analyses of dip direction and frequency of cut-slopes established by reinforcement and protection methods, slopes with dip direction of $80-120^{\circ}$ and $280-320^{\circ}$ mostly occur. However, slopes with dip direction of $0-80^{\circ}$(N and NW) and $120-160^{\circ}$(SE) are not distributed in the study area. Failure aspects were analyzed for three major directions of the slopes, respectively. The results of failure aspects analyzed indicate that slopes in the study area could generate various failures as the results of intersection and/or intersection combination among joints, foliations(bedding) and cleavages. However, possibility of failure in a slope of major direction No. 3 is statistically very low because of low frequency in total number of slopes with the direction and of formation of small scale-slopes geographically, although the slope might generate all aspects of failure-modes.

• Korean journal of applied entomology
• /
• v.47 no.4
• /
• pp.333-336
• /
• 2008

During the excavation to find ancient rice seeds from the peat layer (12,500-14,800 bp based on 14 dating samples) of Soro-ri, Cheongwon-gun near Cheongju city, we found not only old rice seeds, but also other organic materials including insect fossil skeletons. Although no complete specimen was found in this study, some body parts were diagnotic enough for identifying species. Among the identified insect fossils, two species were successfully identified based on their characteristic forewing morphologies, e.g., cross-ridges on forewing. The two identified species, Plateumaris sericea and Donacia flemola or near, belong to Donaciinae in Chrysomelidae, and their larvae are known to feed on the root of wetland plants, mainly in Poaceae or Cyperaceae. Such finding proved that a wetland environment was maintained in Soro-ri at that time, and was suitable for such insects to survive. Therefore, evidence from the fossilized rice seeds, together with these insect fossils, clearly proved that the environment at that time was suitable for rice, a common Poaceae species, growing.

• Journal of Technologic Dentistry
• /
• v.31 no.2
• /
• pp.15-22
• /
• 2009

This study examined and analyzed the demographical characteristics of the study target and their expectancy level on the factors in selecting dental medical institutes (basic elements of dental clinics, traffic convenience, physical environment of dental clinic and explicit qualification of dentist) with the questionnaire survey method with 222 questionnaires answered and returned (return rate 88.8%) out of 250 copies distributed to the 1st, 2nd and 3rdyear college students attending technical colleges located in Cheongwon-Gun, Chungbuk, Korea from March 26 to April 7, 2009. The results of this study are as follows: 1. The demographical characteristics of the study target group consisting of 225 college students include 92.3% of age 20s (205 students); 123 males (55.4%) and 99 females (44.6%); the number of those who had at least one experience to visit dental clinic was 199 (89.6%) and 23 (10.4%) of those with no-visiting experience. 2. The descriptive statistics for the selection factor showed that basic elements, traffic convenience, physical environment and explicit qualification of dentist were regarded important as in order. In particular, the factors considered in selecting dental clinic was ordered from most to least in their importance beginning with cleanness of dental clinic as the most important factor, dentist's trustworthiness, kindness of medical staffs, low medical fee, dentist's knowledge level, modernized medical equipments and convenience in using medical facilities as the least. On the contrary, brand name of dental clinic, age, college, sex and appearance of dentist were rated low in order in terms of their importance in selecting dental clinic. 3. As for the difference in the selection factors across demographical characteristics, while male students placed importance on traffic convenience and physical environment of dental clinic, female students placed more importance on dentist's qualification and basic elements of dental clinic. With respect to the difference in the selection factors across the visiting experiences, while those with visiting experience regard traffic convenience more importantly, those without visiting experience regarded physical environment of dental clinic, dentist's qualification and basic elements of dental clinic. 4. In terms of pearson correlation coefficient, the result showed that all aspects in selecting dental clinic were positively correlated. Particularly, the correlation between physical environment of dental clinic and dentist's explicit qualification were correlated highest. Significant positive correlations were found high in traffic convenience, physical environment of dental clinic, dentist's explicit qualification and basic elements of dental clinic in order.

• Journal of the Korean Geographical Society
• /
• v.47 no.1
• /
• pp.79-97
• /
• 2012

This study examines on the impact of biodiversity in circular greenspace of Cheongju city since 2002 greenbelt release. Research has carried out to investigate the biotope pattern change with landscape fragmentation. Major landscape fragmentation has occurred with development of residential sector and build-up of major highways. Settlement has been expanded to the entire area connected to urban district excluding the eastern forest. North-south district shows high road density, where inter-regional roads meet in the cross-section. It is found that landscape fragmentation impact on species richness as well as population size of the species varies depending on the animal species. The birds show high species richness in N2, N3, N4, S2(north-south zone) even with high fragmentation rate. This can be explained that birds can access to aquatic environment where they can find abundant food resources. The amphibians and the reptiles show almost no zonal variation in species richness than the birds. The more a zone fragmented in small patches, the species richness of the amphibians and the reptiles also tends to be declined. Information accumulation on biodiversity for integrating landscape planning in urban planning, various level of community participation in decision making process, and cross border cooperation with neighbouring Cheongwon-gun will be required for sustainable greenspace management of Cheongju City.

• Journal of the Korean Chemical Society
• /
• v.48 no.3
• /
• pp.283-290
• /
• 2004

The purpose of this study were to develop of courseware using scaffolding strategy and to investigate the effect of courseware instruction upon students' conceptual understanding and affective domain including effort and self-checking. 10th grade students in the experimental and control groups were selected from high school at Cheongwon-gun in Chungbuk, and taught about chemical reaction rate for 3 class hours. The students in the experimental group studied individually through courseware using scaffolding strategy and worksheet and teacher-centered expository lesson was used in the control group. Prior to the instructions, test specification for problem-solving assessment (TSPSA) was administered and the scores of the previous science achievement test were obtained. After the instructions, the posttest on conceptual understanding and TSPSA were administered. Results of this study revealed that the mean score of the experimental group in the conceptual understanding test was similar to that of the control group at statistically significant level. This result implies that the courseware using scaffolding strategy could be a tool of the individualized instruction. The experimental group improved significantly better in three components of the TSPSA such as effort, self-checking, and cognitive strategy. From this result, it is considered that learners' self regulation is improved by being taken over responsibility of learning. So, it is suggested that instruction using scaffolding strategy is needed in science class to improve self-leading learning ability.

• Korean Journal of Environmental Biology
• /
• v.27 no.1
• /
• pp.73-81
• /
• 2009

Population viability analysis of a Gold-spotted pond frog (Rana chosenica) population at Cheongwon-gun, Chungbuk, in South Korea was conducted and we proposed several suggestions for effective conservation and re-introduction of the species. Simulating a developed model over 1,000 times predicted that the population will exist over 30 years with a relatively low growth rate of 0.113, but with a high probability of extinction as 81.1%. Population growth and extinction probability were the most greatly depended on the rate of successful metamorphosis. In the case of outbreak of amphibian diseases such as Chytridiomycosis and Ranavirus, the population will be easily extinct within 4 years with 100% probability. In a habitat of which carrying capacity is 200, to successfully re-introduce an extinct population, it is initially needed to put 100 individuals of which 83% is males and its age structure is normal-distributed. If we additionally conducts artificial supplementation of 10% individuals every 2 years from 4 years to 10 years after initial reintroduction, the population will become a stable with 0.297 growth rate and 0.290 extinction rate. Our results are the first case of amphibian population viability analysis in Korea and could be used to develop effective conservation and re-introduction plans for endangered Gold-spotted pond frog.