• Korean Journal of Remote Sensing
• /
• v.40 no.3
• /
• pp.257-268
• /
• 2024

Drone-mounted hyperspectral sensors (DHSs) have revolutionized remote sensing in agriculture by offering a cost-effective and flexible platform for high-resolution spectral data acquisition. Their ability to capture data at low altitudes minimizes atmospheric interference, enhancing their utility in agricultural monitoring and management. This study focused on addressing the challenges of radiometric and geometric distortions in preprocessing drone-acquired hyperspectral data. Radiometric correction, using the empirical line method (ELM) and spectral reference panels, effectively removed sensor noise and variations in solar irradiance, resulting in accurate surface reflectance values. Notably, the ELM correction improved reflectance for measured reference panels by 5-55%, resulting in a more uniform spectral profile across wavelengths, further validated by high correlations (0.97-0.99), despite minor deviations observed at specific wavelengths for some reflectors. Geometric correction, utilizing a rubber sheet transformation with ground control points, successfully rectified distortions caused by sensor orientation and flight path variations, ensuring accurate spatial representation within the image. The effectiveness of geometric correction was assessed using root mean square error(RMSE) analysis, revealing minimal errors in both east-west(0.00 to 0.081 m) and north-south directions(0.00 to 0.076 m).The overall position RMSE of 0.031 meters across 100 points demonstrates high geometric accuracy, exceeding industry standards. Additionally, image mosaicking was performed to create a comprehensive representation of the study area. These results demonstrate the effectiveness of the applied preprocessing techniques and highlight the potential of DHSs for precise crop health monitoring and management in smart agriculture. However, further research is needed to address challenges related to data dimensionality, sensor calibration, and reference data availability, as well as exploring alternative correction methods and evaluating their performance in diverse environmental conditions to enhance the robustness and applicability of hyperspectral data processing in agriculture.

• Journal of Plant Biology
• /
• v.38 no.3
• /
• pp.305-317
• /
• 1995

The bryophyte communities on the forest floor of the mixed coniferous, deciduous broad-leaf forest and the evergreen coniferous forest of cool temperate and subalpine zones in Chiri Mountains with the highest peak (Cheonwangbong 1915 m) in south-central part of the Korean Peninsula were investigated from the phytosociology viewpoint. As a result, five bryophyte communities were recognized, considering the species composition of vascular vegetation; A. Sasamorpha borealis-Abies koreana/Dicranum scoparium-Plagiothecium silvaticum community, B. Bosta minor-Abies koreana/Anomodon rugelii-Plagiomnium cuspidatum community, C. Abies koreana/Hylocomiopsis ovicarpa-Entodon rubicundus community, D. Abies koreana-Picea jezoensis/Hylocomiopsis ovicarpa-Thuidium kanedae community, E. Abies koreana-Pieea jezoensis/Hylocomium splendens-Pleurozium sehreberi community. Among these, the communities A, B, C and D were distributed in the mixed coniferous and deciduous broad-leaf forest of lower altitudes (1200 to 1700 m) and characterized by the elements of the cool temperate zone. They were confimled as synusies belonging to the Fraxino-Abietetum koreanae Song 1988. The community E was distributed in higher altitudes (1700 m to near the summit) and characterized by the species group of the holarctic elements, e.g. Hyloeomium splendens, Pleurozium sehreberi, Dieranum majus, etc. limited in subarctic; subalpine and arctic; alpine zones. The community E was confirmed as a synusie of the Abieti koreanae-Piceetum jezoensis Song 1991 belonging the Vaecinio-Pieeetea Br.-BI. 1939. Up to date many investigator have described the coniferous forest distibuted above 1200 m in Chiri mountauns as the forest vegetation of subalpine zone. However, from the results of the present study, the boundary of the mixed forest and the true subalpine coniferous forest was elucidated to be ca. 1700 m phytosociologically. Species richness was highest in the community E, and the other four communities showed a similar species richness. Among the species diversity indices, H' and D were high in the communities Band E, low in the communities A and C, and medium in the community D. The values of J' decreased with the increase in altitudes and the community E showed the lowest value. The result of Bray-Curtis ordination revealed that the diversity analysis and the division of the above two forest zones are justifiable. The taxa of the bryophyte communities were composed of 25 families, 46 genera, 73 species, 1 subspecies and 2 varieties.

• Journal of the Korean Geographical Society
• /
• v.49 no.1
• /
• pp.32-44
• /
• 2014

This study aimed to analyze the characteristic of the distribution of minimum temperature during January in the central region of South Korea and to investigate causes for the occurrence of extreme minimum temperature in Cheorwon. January temperature distribution data which were collected from 25 weather stations in central area from 1991 to 2010 were investigated, and the difference of temperature between Cheorwon and the other stations in central region, such as Chuncheon, Hongcheon, Bonghwa, Daegwallyoung, Wonju and Jecheon were analyzed by the type of atmospheric pressure system. Daily mean temperature and mean of daily minimum temperature appear to be low at Cheorwon and at the sites in high altitudes, but the frequency of extreme cold wave such as below $-15^{\circ}C$ is also noticeable in Cheorwon. When the Siberian High has expanded and migratory anticyclone has moved onto the north of the Korean Peninsula, the temperature at Cheorwon is relatively low. Furthermore it shows a lesser difference between Cheorwon and the compared stations when the migratory anticyclone affected the area, even at basin like Bonghwa, Jecheon more lower than Cheorwon.

• Journal of Korean Academy of Nursing
• /
• v.12 no.1
• /
• pp.13-24
• /
• 1982

The main purpose of this study was to investigate attitudes toward mental illness and the mentally ill of psychiatric nurses in Korea and to identify the relationships between the nurses' attitudes and demographic variables. Subjects in this study were 122 psychiatricnurses and 111non-psychiatric nurses in active service at 12 hospitals in Seoul. The insrtument used for measuring attitudes was a questionaire developed by Cohen and Struening (1962) referred to as the“Opinions about Mental illness(OMI) Scale”made up to 51 Likert-type items. The findings of this study indicated hatnurses showed negative attitudetoward mental illness and the mentally ill: Very high on social restrictiveness (factor D), low on Mental Health Ideology (factor C), and Interpersonal Etiology (factor E). Since the high score on Factor A, B and the low score on Factor B, C, E reflect a negative altitudes toward mental illness, this study population related extremely negative attitudes compared to any other surveys. And of the demographic variables that related to their attitudes the education degree and the kind of the hospital in active service showed very significant differences. On the basis of the investigation the findings indicated the followings; 1) Althohg attitudes toward mental illness and the mentally ill of psychiatric nurses were not significant differences from non-psychatric nurses, there was a trend that attitudes of psychaitric nurses did show more negative responses rather than those of non-psychiatric nurses. 2) Demographic variables that relate to their attitudes on the OMI scale were the education degree of the respondent and the kind of their hospital in active service. 3) About attitudes toward mental illness and the mentally ill baccalaureate nursesshowed more positive attitudes in Factor A (Authoritarianism), Factor C (Mental Health Ideology) and Factor D (Social Restrictiveness) than diploma program murses. 4) Nurses in active Service in the private hospital revealed more positive attitudes(A,B,C,D) except Factor (E) than those in the national or public hospital. 5) The ages, duration of work, wanted or unwantedG roup of psychiatric ward and satisfactory level of psychiatric nursing service were non-significant.

• Korean Journal of Ecology and Environment
• /
• v.46 no.3
• /
• pp.319-331
• /
• 2013

Recent climate change, which is mostly ascribed to anthropogenic activities, is believed to be a major factor leading to biodiversity decreases and ecosystem service deteriorations. I have reviewed recent studies on climate change effects for many ecological processes involved with plants, in order to improve our understanding of the nature of ecological complexity. Plants in general have better growth and productivity under high levels of $CO_2$, although the long term effects of such $CO_2$ fertilizers are still controversial. Over the last 30 years, the Earth has been greening, particularly at higher latitudes of the Northern Hemisphere, perhaps due to a relaxation of climatic constraints. Human appropriation of net primary productivity (NPP), which corresponds up to 1/3 of global NPP, is ultimately responsible for climate change and biodiversity decreases. Climate change causes phenological variations in plants, especially in regards to spring flowering and fall leaf coloring. Many plants migrate polewards and towards higher altitudes to seek more appropriate climates. On the other hand, tree mortality and population declines have recently been reported in many continents. Landscape disturbance not only hinders the plant migration, but also makes it difficult to predict the plants' potential habitats. Plant and animal population declines, as well as local extinctions, are largely due to the disruption of species interactions through temporal mismatching. Temperature and $CO_2$ increase rates in Korea are higher than global means. The degree of landscape disturbances is also relatively high. Furthermore, long-term data on individual species responses and species interactions are lacking or quite limited in Korea. This review emphasizes the complex nature of species responses to climate change at both global and local scales. In order to keep pace with the direction and speed of climate change, it is urgently necessary to observe and analyze the patterns of phenology, migration, and trophic interactions of plants and animals in Korea's landscape.

• Journal of the Korean Solar Energy Society
• /
• v.32 no.4
• /
• pp.71-81
• /
• 2012

This study for the understanding of the radiation environment according to the altitude in urban area in the summer observes the long and short wave radiation environment at the 4 urban areas with different height and the 1 suburban area. The results of this study are as follows. (1) When the altitude was high, the more short wave radiation was observed. (2) As the altitude was high, the temperature of atmosphere got lower. And because of that the downward long wave radiation was also lower. This general trend was confirmed through the study. (3) Through the observation of long wave radiation, the upper atmosphere of suburban area had the atmosphere characteristic which the temperature was rising and decreasing faster. Therefore, the difference radiation characteristics between the urban and suburban area were confirmed. (4) The result of the ratio of short wave radiation to long wave radiation(short wave radiation/long wave radiation) according to the altitude and location, the value was increased when the distance was far from the artificiality structure or a heat source, and the urban effect became smaller. Thus, it is expected that the ratio will be an evaluation index for evaluating urbanization effect.

• Journal of International Academy of Physical Therapy Research
• /
• v.8 no.1
• /
• pp.1114-1121
• /
• 2017

The purpose of this study was to investigate the effects of hypobarichypoxic training program on competitive performance. This was done by observing their conditioning and measuring their blood constituents before and after a multi-staged intermittent training program, over 2 weeks. Three national handicapped cyclists were placed in a multi-leveled hypobaric-hypoxic (flat-4000 meter (m) high elevation) environment with consistent temperature and humidity ($23{\pm}2^{\circ}C$, $50{\pm}5%$) for 2 weeks. After the training, the blood constituents and average heart rate (HR) were measured and the following results were obtained. In all three athletes, there were no unique changes in red blood cell count, hemoglobin, and hematocrit, while there was a rise in the reticulocyte count. Observations of the difference in average HR during exercise at varying altitudes showed that athlete A had an average increase in the HR for the first 5 days at 2000 m. For athlete B, the comparison of the first and last training sessions at an altitude of 2000 m showed an HR increase of approximately 17%. For athlete C, there was a steady increase in the HR until day 7 of the training. As such, hypobaric-hypoxic training suggested that improvement of aerobic exercise performance in these athletes and it is recommended that there be a development for future training programs at high altitude, geared towards handicapped athletes of various disciplines.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.11 no.4
• /
• pp.252-255
• /
• 2009

In this study we investigated the natural habitats of Allium grayi, Allium monanthum, Allium tuberosum' and Allium schoenoprasmum to develop a fundamental database for their breeding and cultivation. Both Allium grayi and Allium monanthum were growing wild mainly in the areas with the altitude of ${\leq}\;300\;m$. The natural habitats of Allium grayi and Allium monanthum were limited to the altitude of 1,000 and 800 m, respectively. Allium thunbergii was growing at a wide range of altitude from the lowlands (${\geq}\;100\;m$) to the high elevated areas (${\leq}\;1,000\;m$) whereas Allium maximowiczii was growing wild only at the high altitude of ${\geq}\;900\;m$. The number and the size of the natural habitat of Allium grayi were greater than those of Allium monanthum. The natural habitats of Allium grayi were in the Gyeonggi, Gangwon, Jeolla, and Gyeongsang Provinces whereas those of Allium monanthum were found mainly in the Chungcheong and Jeju Provinces. Allium grayi was growing wild in both inland and seaside districts whereas Allium monanthum was mainly in the inland areas.

• Journal of the Korean Society for Aviation and Aeronautics
• /
• v.28 no.4
• /
• pp.1-11
• /
• 2020

In order to diagnose low-level turbulence in Korea, diagnostic indices of low-level turbulence were calculated from Aug 2016 to Jul 2019 using a Korea Meteorological Administration Post Precessing (KMAPP) developed by the National Institute Meteorological Sciences (NIMS), and the indices were evaluated using Aircaft Meteorological Data Relay (AMDAR). In the mean horizontal distribution of diagnostic indices calculated, severe turbulence was simulated along major domestic mountains, including near the Taebaek Mountains, the Sobaek Mountains and Hallasan Mountain on Jeju Island due to geographical factors. Later, detection performance was evaluated by calculating the KMAPP Low-Level Turbulencd index (KLT) on combined index, using AUC value of Individual diagnostic indices as a weight. The result showed that the AUC value of KLT was 0.73, and the detection performance was improved (0.02-0.13) when the index was combined. Also, when looking for the AMDAR data is divided into years, seasons, and altitudes, up to 0.94 AUC values were found in winter (DJF) and the surface (surface-1,000ft). By using high-resolution numerical data reflecting detailed terrain data, local turbulence distribution was well demonstrated and high detection performance was shown at low-level.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.44 no.5
• /
• pp.707-717
• /
• 2024

Recently, the implementation of unmanned and automated technologies has been actively considered as a solution to reduce safety accidents in industrial sites. However, bridge construction sites are recognized as a more challenging area for research and development compared to other industries due to the complexity of the site, such as weather and terrain, and the fact that the work is not repetitive or standardized. In this paper, a formwork system for unmanned and automated construction of bridge piers, which are considered high-risk work environments due to tasks such as rebar assembly, concrete pouring, and formwork dismantling and assembly at high altitudes, was developed. To achieve this, the formwork was equipped with motorized spindles and an automated lifting system to replace the manual dismantling and assembly process. Additionally, manipulators were installed on the upper work platform to replace workers in tasks such as rebar assembly and concrete pouring. To verify the proposed technology, we aimed to demonstrate the feasibility of the automated formwork system for unmanned pier construction through an assembly test.