• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.720-723
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• 2003

Electric stimulation of teeth is used for assessing pulp vitality. Because of very high and wide range of impedance of the enamel, electric pulp testers use high voltage, high output impedance and alternative current source. Most pulp testers use voltage stimulation method and their stimulating threshold levels significantly depend on each individual. Therefore, a constant current stimulator is necessary to minimize the effect of wide variation in enamel thickness. In this study, we constructed a constant current source type of pulp tester with the maximum current of 150 uA.

• 한국환경생태학회지
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• 제30권3호
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• pp.415-422
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• 2016

본 연구는 천연기념물로 지정된 소나무와 은행나무를 중심으로 수목활력도를 측정하고, 관리시설물에 따른 노거수의 수목활력도 차이를 규명하였다. 수목활력도 측정 결과 소나무의 전기저항 값은 평균 $14.9K{\Omega}$이고, $8.5{\sim}37.5K{\Omega}$사이에 분포하며, 은행나무의 전기저항 값은 평균 $13.5K{\Omega}$로, $6.4{\sim}40.5K{\Omega}$사이에 분포하는 것으로 나타났다. 관리시설물 현황조사 결과 소나무, 은행나무 모두 과반수 복토 및 석축이 이루어졌고, 특히 복토 여부에 따라 수목의 활력에 유의한 차이가 있었다. 소나무와 은행나무 모두 복토 된 수목의 형성층 전기저항 값이 복토되지 않은 수목보다 유의하게 높게 나타나 상대적인 생육상태가 불량한 것으로 나타났다. 따라서 복토를 제거하는 방향으로 관리가 필요하며 천연기념물로 지정된 노거수 외 지자체에서 관리하고 있는 보호수에 대한 관리방안 실태조사도 실시하여 전반적인 복토 제거 등 관리시설물 개선이 필요할 것으로 판단된다.

• The Korean Journal of Ecology
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• 제24권5호
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• pp.259-265
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• 2001

울산광역시 목도 식생에 대한 식생학적 연구가 수행되었다. 전통적인 군락분류법에 의한 식생유형 분석과 축적 1:800의 현존식생도를 제작하여 식생의 공간적 분포양식을 규명하고, 식생자원진단카드를 개발하여 주요 수목에 대한 활력도를 평가하였다 목도의 식생은 50과 93속 111종 (귀화식물 11종 포함)으로 이루어진 13개 식물군락이 분포하는 것으로 밝혀졌다. 목도식생은 섬 면적의 37.4%를 차지하는 상록활엽수림의 후박나무군락으로 대표되며, 극히 단순한 종조성과 층구조, 그리고 주요 수목 가운데 95.7%가 절대감시 및 주요감시 대상인 개체를 포함하고 있는 매우 취약한 식생구조인 것으로 밝혀졌다. 상록활엽수림과 상록침엽수림은 해양에 대응한 공간적 분포의 경향성이 뚜렷한 것으로 밝혀졌다. 본 연구를 통하여 목도식생의 보전을 위한 장기생태연구의 토대를 구축하였다.

• 대한치과마취과학회지
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• 제12권1호
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• pp.17-23
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• 2012

Background: This study evaluated pulp vitality of anterior permanent teeth using pulse oximetry (PO), which is already used for monitoring of patient's $SpO_2$ and pulse rates (PR). Also we compared with ice tests and electric pulp test (EPT). Methods: 9 teeth, endodontic treated, were selected as non-vital teeth group. 17 vital teeth were selected as control group. Our aim is to compare sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of ice test, electric pulp test and pulse oximetry, respectively. Pulse oximetry has two test results, $SpO_2$ and pulse rates. Also we calculated correlation and statistical significances by Pearson's test between EPT and pulse oximetry. Results: Sensitivity, specificity, PPV, NPV were calculated on each tests. Ice test has results of 1.00, 0.89, 0.94 and 1.00, respectively. EPT has results of 0.94, 0.78, 0.89 and 0.88 respectively. $SpO_2$ has results of 0.94, 1.00, 1.00 and 0.90, respectively. PR has results of all 1.00. Conclusions: PO showed relatively accurate, stable and objective results on both $SpO_2$ and PR. Percentage of ability of accurate diagnosis for vital teeth is 94% for ice test, 89% for EPT, 100% for $SpO_2$ and PR. Percentage of ability of accurate diagnosis for non-vital teeth is 100% for ice test, 88% for EPT, 90% for $SpO_2$ and 100% for PR. In additions, PR could be more accurate and significant tests than $SpO_2$.

• 한국농림기상학회지
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• 제5권3호
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• pp.166-171
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• 2003

본 연구는 가로수의 염류 피해 원인을 밝히고, 생리생화학적 내성 특성을 구명하고자 하였다. 공시재료는 2년생 느티나무를 사용하였으며, NaCl을 0, 3, 14, 56, 112mM로 토양에 처리한 후, 근원경, 형성층 전기저항치와 잎 내 탄수화물 및 이온 함량 등을 측정하여 생리적인 피해 반응을 비교 분석하였다. 느티나무는 NaCl처리에 의해 생리적인 대사과정이 저해를 받은 것으로 나타났다. 특히 염류농도가 증가함에 따라 활력이 감소하였으며, 체내 이온농도가 변하여 이온 불균형이 발생하였다. 이러한 결과는 염류 처리에 의해 식물의 뿌리에서 수분 흡수력이 저해되면서 수분 스트레스가 유발되었기 때문인 것으로 판단된다. 반면 생장과 체내 탄수화물 대사에는 큰 영향을 주지 않았는데, 이것은 NaCl 처리 농도가 너무 낮았거나 처리 기간이 너무 짧았기 때문인 것으로 판단된다. 그러나 느티나무 가로수가 장기적으로 염류에 노출되었을 경우, 생장에 심각한 장애가 발생할 것으로 예측된다.

• 환경위생공학
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• 제1권1호
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• pp.97-107
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• 1986

This study was performed to investigate the air pollution tolerance of urban trees; Gingko biloba, Platanus occidentalis, Salix pseudolagiogyne and Purunus serrulata growing in Seoul, Taegu, Chungju area. Vitality of trees and water soluble sulfur content in the leaves were determined at 24 points in those cities. The ratio of the each number of Platanus occidentalis, Gingko biloba, Salix psuedolagiogyne and Prunus serrulata to the total number of urban tree in Seoul area was $49.38\%,\; 17.36\%,\; 13.42\%,\;2.43\%$, respectively. Its ratio in Taegu area was $36.76\%,\;14.25\%,\;13.36\%,\;3.32\%$ and in the Chungju area was $59.06\%,\;17.35\%,\;11.09\%,\;8.33\%$, respectively. The species deversity was 0.7017, 09067, 0.5297 in Seoul, Taegu, Chungju, respectively. The significant correlation between the S02 concentration and the tree vitality highly found on Platanus occidentalis, Gingko biloba, Salix pseudolagiogyne and Prunus serrulata. Positive correlation coefficient between $SO_2$ concentration and water soluble sulfur content were shown on Platanus occidentalis, Salix pseudolagiogyne and Prunus serrulata and that between tree vitality and water soluble sulfur content were shown on Platanus occidentalis and Gingko biloba. The tolerant to the S02 gas was high in order of Salix pseudolagiogyne, Gingko biloba, Prunus serrulata and Platanus occidentalis. Also the absorption activity to the $SO_2$ gas was high in order of Salix psuedolagiogyne, Gingko biloba, Platanus occidentalis and Prunus serrulata.

• 한국조경학회지
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• 제31권5호
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• pp.31-42
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• 2003

This study looked at worked on remaining landscapes in terms of landscape ecology. It presented some ways to conserve and to activate remaining landscapes with examples of agricultural lands in Hwa-won Gun, Ok-po Myun. The results are as follows: We investigated 20 remaining landscape types and 90 remaining landscapes, and classified them in terms of forest and water zones. To evaluate the investigated remaining landscapes, we produced a grading system using 8 criteria such as vitality, stability, field suitability, type of inner scenery formation, connection, recreation, and culture/tradition. Our evaluation of the vitality found that Grade I had the mast remaining landscapes; Grade II had 28, Grade III had 16, Grade V had four, and Grade IV had none. We evaluated the outer landscape influence using 3 criteria such as divisibility, vitality, and indication. We found from evaluating the type of inner scenery formation that most of the landscapes superior to Grade III were adjacent to water zones and that linear landscapes evaluated as Grade I, and II played an important role in this connection. We evaluated the recreation probability using marks, frequencies, and emergencies of peculiar types. Based on the results, we proposed some ways to conserve and to activate the remaining landscapes classified by grades using the results of the last evaluation. Additionally, we proposed some ways to activate the restoration of the linear axis of the green space function the formation of a buffer green space around matric space, the improvement of the axis of the green space center, and the formation of additional green tracts of land to play the role of stepping stones. We proposed the possibility of improving uniformed farm land structures. This study did not consider the weighting values of the evaluation index. Therefore a more objective study will be needed with an expert-survey in the future.

• KIEAE Journal
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• 제9권2호
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• pp.43-52
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• 2009

The aim of this study is to find out the solutions for an improvement of residential environment through the relation between satisfaction of residential environment and amenity awareness of the local residents in Chonnam Mokpo city. For this purpose, it is conducted a questionnaire survey of 203 local residents on the attributes of residential environment. The satisfaction factors of residential environment consist of 8 types of factors such as housing structure, stability, green tract of an avenue, convenience, housing environment, sanitary conditions, waterside facilities, and familiarity. It is analyzed that there is a great difference of the satisfaction between new town dwellers and old town dwellers in three satisfaction factors of a housing structure, convenience, and housing environment. The attributes of amenity awareness consist of 6 types of factors such as fitness, comfort, intimacy, vitality, naturalness, and brilliance. The new town dwellers have a high satisfaction in fitness and vitality factors, and the old town dwellers have a high satisfaction in naturalness factors. Through the analysis to the importance on the satisfaction factors of residential environment related to amenity awareness, it is founded that intimacy factor have importance in order of stability, familiarity, green tract of an avenue and sanitary conditions. Naturalness factor have importance in order of stability, waterside facilities, familiarity and green tract of a avenue. Fitness factor have importance in order of housing structure and sanitary conditions. Comfort factor have importance in order of stability, housing environment and sanitary conditions. And vitality factor have importance in order of housing environment, convenience and green tract of an avenue. Therefore, it is needed that the development plan of residential environment take into consideration in accordance with the importance on the satisfaction of residential environment in Mokpo city.

• Journal of Ecology and Environment
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• 제35권2호
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• pp.111-122
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• 2012

The sex ratio and spatial structure of different sexes are major components that affect the reproductive success and population persistence of dioecious plants. The differential reproductive costs between male and female plants are often believed to cause a biased sex ratio and spatial segregation of the sexes through slower growth and/or lower female survivorship. In this study, we examined the sex ratio and spatial structure of one population of $Torreya$ $nucifera$ trees in Jeju Island, Korea. We also tested the effects of the current tending actions in relation to tree vitality. At the population level, the sex ratio of the 2,861 trees was significantly biased toward males; however, it also showed considerable variation among different diameter at breast height classes and across habitats according to terrain level (from upper to lower). In 1999, before tree management (tending) began, among the ecological traits examined, only climber coverage correlated with tree vitality. Intensive tending such as climber removal since 1999 clearly enhanced the vitality of the majority of trees, but its effects were more conspicuous in medium-sized trees than in small ones, in upper terrain trees than those in other terrains, and in females than in males. Both male tree domination in small and large trees and tending effects on females are likely to reflect the effects of female reproductive costs regarding growth and/or survivorship. Spatial segregation between males and females was not observed in $T.$ $nucifera$. Habitat heterogeneity created by the forest's rocky ground and its implications regarding sex ratios and spatial structure require further studies.

• Clinical and Experimental Reproductive Medicine
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• 제29권2호
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• pp.149-157
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• 2002

Objectives: To assess the scavenging effect of carnitine derivatives on oxidative damage to sperm during sperm processing, cryopreservation and thawing. Materials and Methods: Fresh semen samples from 20 normal healthy volunteers were collected by masturbation after at least 48 hours abstinence. After liquefaction of semen samples at room temperature, the specimens were diluted with sperm wash media (Ham's F-10, Life technologics) to a uniform density of $20{\times}10^6/ml$. L-carnitine or acetylcarnitine were added with various concentration of $0{\mu}M$, $10{\mu}M$, $30{\mu}M$ in semen sample or cryoprotectant. All specimens were cryopreservated at $-196^{circ}C$ $LN_2$ for 3 days. Sperm motility, vitality, fertilizing capacity, reactive oxygen species formation and the level of lipid peroxidation were analyzed by computer assisted semen analyzer, eosin-nigrosin stain, hypoosmotic swelling test, chemiluminescence and thiobarbituric acid method, respectively, during sperm processing, cryopreservation and thawing. Results: The sperm motility was only increased in proportion to the concentration of acetylcarnitine with no statistical significance (p>0.05). The sperm vitality was also significantly improved in proportion to the concentration of acetylcarnitine with statistical significance (p<0.05). The sperm fertilizing capacity was significantly increased in proportion to the concentration of L-carnitine and acetylcarnitine and reactive oxygen species generation and lipid peroxidation were significantly decreased with same fashion (p<0.05). On comparison of effects between L-carnitine and acetylcarnitine, acetylcarnitine was superior to L-carnitine on the improvement of sperm motility and vitality as well as the suppression of reactive oxygen species generation and lipid peroxidation. Conclusions: These results suggest that carnitine derivatives have a scavenging effect against oxidative damages during sperm processing, cryopreservation and thawing. Therefore, carnitine derivatives may be useful as an oral antioxidant in patients with male infertility due to increased ROS generation.