• ETRI Journal
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• v.33 no.4
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• pp.547-557
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• 2011

This study presents an approach for extracting boundaries of various buildings, which have concave boundaries, inner yards, non-right-angled corners, and nonlinear edges. The approach comprises four steps: building point segmentation, boundary tracing, boundary grouping, and regularization. In the second and third steps, conventional algorithms are improved for more accurate boundary extraction, and in the final step, a new algorithm is presented to extract nonlinear edges. The unique characteristics of airborne light detection and ranging (LIDAR) data are considered in some steps. The performance and practicality of the presented algorithm were evaluated for buildings of various shapes, and the average omission and commission error of building polygon areas were 0.038 and 0.033, respectively.

• Journal of information and communication convergence engineering
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• v.19 no.3
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• pp.131-135
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• 2021

The interference between closely placed co-coverage satellites was analyzed. In general, a satellite network may use different orthogonal polarizations and frequencies to increase the throughput of a satellite. However, when orthogonal linear polarization (horizontal polarization and vertical polarization) or orthogonal circular polarization (left-handed circular polarization and right-handed circular polarization) is used, the signal from one polarization sense to another may be coupled, resulting in cross-polarization interference. This signal-coupling arises due to the finite value of the cross-polarization discrimination of the earth station. In this study, field equations were used to analyze the interference between adjacent satellites using co-frequency. The level of interference was compared to that when two adjacent satellites used the same polarization. The simulation results show that the interference mainly depends on the off-axis co-polar pattern and the cross-polar pattern of the earth station antenna.

• Journal of Environmental Health Sciences
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• v.37 no.5
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• pp.335-341
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• 2011

The Goseong abandoned mine accident was a typical case of long-term sequela resulting from environmental disruption during the rapid economic development of Korea. While the final conclusion of epidemiologic investigation was that residents surrounding the abandoned mine were simply exposed to cadmium from the abandoned mine without any patient contracting 'itai-itai' disease, not only did residents around the abandoned mine suffer enormous psychological and economic damage, but people in neighbouring communities did as well when the entire area was stigmatized as an contaminated area. Environmental civic groups and the government worked together to solve the problem by forming a joint committee which held the right of decision in any matter to be determined. By inviting all the stakeholders to participate in the joint committee, a transparent investigation was guaranteed and the results of investigation and recommendations to solve the problem were accepted by all involved. Even though the environmental health division in Ministry of Environment has developed considerably and built up a capacity to deal with environmental accidents, the process which was adopted to solving the Goseong abandoned mine accident can be useful to settle environmental health issues with severe conflicts among stakeholders.

• Journal of Agricultural Extension & Community Development
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• v.9 no.1
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• pp.43-60
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• 2002

Recently the North Korea has been suffered from the grain shortage, and the fundamental reason was in the socialistic land regulations and collective production which restrain farmers' labor desire. So one of the key in solve the problem may be in the reformation of the socialistic land regulations and collective production, however, the capitalistic land regulations may not work as the reformational alternative in the North Korea. The third alternative for land should consider efficiency and equality of reformation itself as well as environmental problems. The purpose of the study was to discuss the possible application of the Public Land Lease from Henry $George(1839{\sim}1897)'s$ theory. The basic idea of the Public Land Lease was that the government has the right of sentence and the right of profit for the land, and the individual has the right of use for the land. Under the Public Land Lease, the individual must pay the land rent for the period of the use for land, and must return the land when the contract is over. If the North Korea's rural land regulations reformed into the Public Land Lease, it would be the first reformational model beyond china.

• Parasites, Hosts and Diseases
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• v.49 no.2
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• pp.173-175
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• 2011

Ophthalmomyiasis rarely occurs worldwide, and has not been reported in Korea. We present here a case of ophthalmomyiasis caused by Phormia sp. fly larva in an enucleated eye of a patient. In June 2010, a 50-year-old man was admitted to Dankook University Hospital for surgical excision of a malignant melanoma located in the right auricular area. He had a clinical history of enucleation of his right eye due to squamous cell carcinoma 5 years ago. During hospitalization, foreign body sensation developed in his right eye, and close examination revealed a fly larva inside the eye, which was evacuated. The larva was proved to be Phormia sp. based on the morphology of the posterior spiracle. Subsequently, no larva was found, and the postoperative course was uneventful without any complaints of further myiasis. This is the first case of ophthalmomyiasis among the literature in Korea, and also the first myiasis case caused by Phormia sp. in Korea.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.25 no.2
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• pp.220-228
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• 2015

Objectives: The purpose of this study was to investigate estheticians' self-reported pain symptoms and pain levels according to the parts of the hand. Methods: Data were collected through a questionnaire survey among 116 estheticians from 31 skin care centers and spas. Information about general characteristics, job characteristics and work characteristics were based on data from the self-administered questionnaire. To determine the self-reported pain symptoms and pain levels according to the parts of the hand, a Cornell Musculoskeletal Discomfort Questionnaire was used. Results: The subjects had the greatest self-reported pain symptoms in the thumb(Right: 53.4%, Left: 46.6%) and felt the highest level of pain in the wrist(Right: 4.87 points, Left: 4.71 points). Physical burdens and age had statistically significant effects on the pain level in the right hand, while physical burdens and the manager rather than the director had statistically significant effects on the pain level in the left hand. Conclusions: Since the thumb and wrist have the greatest subjective pain symptoms in the hand, the use of proper tools is recommended in order to reduce the usage of the thumbs during massage, as is regular stretching to protect the wrists.

• Environmental Analysis Health and Toxicology
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• v.28
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• pp.15.1-15.8
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• 2013

Objectives The aim of this study was to determine the association between low-level mercury exposure and neurobehavioral functions in adults living in coastal regions of Korea. Methods We selected 172 adults aged 20-65 years living in a city in the coastal region of Korea. A sociodemographic survey was conducted, mercury levels in the blood, urine, and hair were measured, and the associations according to computerized neurobehavioral tests were determined using univariate analysis. After adjustment for associated variables, a multivariate linear regression analysis was performed. Results The geometric mean mercury levels in the blood, urine, and hair were $5.41{\mu}g/L$ (range, $0.00-15.84{\mu}g/L$), $1.17{\mu}g/g$-creatinine (range, $0.00-32.86{\mu}g/g$-creatinine), and 1.37 mg/kg (range, 0.42-6.56 mg/kg), respectively. Variables that were associated with simple reaction time according to the neurobehavioral test results were age and urine mercury level. Variables associated with choice reaction time were the recent use of Korean traditional medicine and urine mercury level. Variables associated with the right-hand finger tapping speed test were age, gender, smoking behavior, education level, monthly household income, and urine mercury level. Variables associated with the left-hand finger tapping speed test were age, gender, education level, and urine mercury level. After adjustment for associated variables, there was no significant association between urine mercury level and simple reaction time (${\beta}=25.96$; p =0.47), choice reaction time (${\beta}=50.37$; p =0.32), or the number of left-hand finger taps (${\beta}=-1.54$; p =0.21). However, urine mercury level was significantly associated with the number of right-hand finger taps (${\beta}=-3.86$; p =0.01). Conclusions We found no evidence that low-level mercury exposure in adults is associated with deficits in neurobehavioral functions. A longer follow-up study is required to confirm this conclusion.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2007.11a
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• pp.258-262
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• 2007

Recently people have come to demand more pleasant environments as the quality and right of life have been improved. Along with industrial development, the tendency is causing a growing number of disputes concerning environmental damages. Of many kind of environmental damages, noise and vibration pollution rising at construction fields are particularly the most common subjects of public grievance. Thus the government launched the Environments Dispute Mediation Committee in 1991, purposing to utilize fully the promptness and expertise of administrative institutes and to resolve environmental damage disputes promptly and fairly by interfering in them actively. With the prompt and fair dispute mediations of the committee, people came to be able to get fair and prompt remedies for damages in their health and fortune by environmental pollution. Therefore, by analyzing dispute mediation cases on construction noise and vibration damages, we will suggests basic material on which efficient actions can be takes for public grievances happening in the future.

• Hwankyungkyoyuk
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• v.21 no.1
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• pp.45-56
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• 2008

This study is to consider the fundamental perceptions of pre-service elementary school teachers to natural environments. The recognition items of questionnaire for those environments include ones of water, atmospheric, soil, biologic and oceanic environments constituting of the earth system. From the results of the study, they affirmatively recognized biologic environment, but they showed highly negative recognitions to others. In other side, it is considered that their recognitions to natural environments were probably transferred by the things which involve press media, curricula and real lives. On the basis of the study results, systematic teaching-learning for natural environments is essential because the encouragement of eco-friendly attitude, one of main goal for environmental education, is budded from basic understandings to natural environments. Affirmatively environmental worldviews for elementary school students are important for reasons why teacher's quality and practice will is fundamental, and then teacher could change the views of the students for environmental education. So, preparing balanced attitudes, right concepts and connection to applicable knowledges for natural environments, pre-service elementary school teachers in environmental education must be pointed to organized education between human and natural environment.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.31 no.1
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• pp.11-17
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• 2023

In this study, the correlation analysis between total system error and environmental factor variables was performed to confirm the effect on the performance of the integrated navigation system by various environmental factors. To collect flight data of hybrid vertical take-off and landing UAVs, scenarios including various turning sections and straight sections such as left turn, right turn, turning rate, and path change angle were selected, and environmental data of wind direction, wind speed, temperature, air pressure, and humidity were collected in real time through weather station. As a result of the correlation analysis between the collected flight data and environmental data, it was concluded that the performance of the integrated navigation system by environmental factors within the collected data was not significant affected and was robust.