Journal of Korean Society for Atmospheric Environment
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제17권6호
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pp.475-485
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2001
The presence of airborne particles in the earth atmosphere expert important controls on the global climate because of their effects on the radiative balance. However, there are major uncertainties associated with the direct and indirect radiative effects of aerosols. In addition, their physicochemical properties cannot only the decline of air quality but also damage human health. Airborne particles were collected by two different commercial air samples, high volume sampler(for TSP) and low volume sampler(for P $M_{10}$ ) at the campus of Kunsan National University during February to September, 2000. In most cases, TSP and P $M_{10}$ were sampled once a week for the duration of 24 hours from 9:00 a.m. In addition samples were collected more intenisve, when the yellow dust was expected. Each sample was analyzed for pH and major ions concentration (C $l^{[-10]}$ , S $O_4$$^{2-}$, N $O_3$$^{[-10]}$ , N $a^{+}$, N $H_4$$^{+}$, $K^{+}$, $Mg^{2+}$, $Ca^{2+}$) by ion chromatography and atomic absorption spectrophotometry. Acidity (pH) of TSP and P $M_{10}$ ranged from 5.09 to 8.51 and from 6.22 to 7.54, respectively. The concentrations of airborne particles were found to satisfy both the short and long-term air quality standards during the sampling period. If the ratio of ionic concentrations originating from None sea salt(Nss) to sea salt(ss) in aerosol samples was concerned, it was found that the ionic concentrations from marine environment contributed dominantly in total mass concentration in the airborne particles. When seasonal trends were examined, the TSP concentrations in spring were higher than those of other seasons. It may result form frequent occurrences of yellow dust and during the spring season. The concentration ratio of P $M_{10}$ to TSP ranged from 0.78 to 1 during the sampling period. pH in the airborne particle was highest during spring, but the other seasons maintained almost same level. These results suggest that alkaline species in yellow dust can directly neutralize aerosol acidity. During spring season, yellow dust could be a positive factor that can defer the acidification of surface soil and water by neutralizing acidic aerosols in the atmosphere.osphere.
Purpose: This study was performed to analyze the mechanism and type of knee injury during soccer game and to evaluate the functional recovery after treatment. Materials and Methods: From October 2002 to January 2005, 49 patients were treated surgically. Mean age was 28.8 (8-36) years old, mean follow-up duration was 14.9 (8-36) months. Injury was evaluated by physical examination, radiography, and arthroscopic finding. Clinical results were evaluated with Lysholm score and Tegner activity score. Results: According to classification of the ligament injury, the incidence of single ACL injury was the most frequent and 27 cases. Injuries took place, in 2nd half of the games, and in the winter. Among the mechanism of injury, turn & twisting was 20 cases and the most frequent. The preoperative Lysholm score, Tegner activity score were 45, 2 and those of last follow-up were 87.6, 6, respectively. Conclusion: The recovery of Lysholm and Tegner activity score were good, but the sports activity was clearly decreased alter injury. It was suggested that appropriate physical & psychological rehabilitation and education were inevitable.
Objective : in order to be convinced of improvement in quality of life in allergic rhinitis patients, I observed clinically remedical effect of Quingbixiaoyanwan-Derivatives(淸鼻消炎丸) on allergic rhinitis with a questionnaire. Methods : We treated forty five allergic patients at the Nam Chun Oriental Medical Hospital from October, 2001 to January, 2002. They were treated with Quingbixiaoyanwan-Derivatives(淸鼻消炎丸), nasal cleansing solution and dietary treatment, and the health-related quality of life with a questionnaire. Results : 1. The gender proportion was twenty five males(55.6%) and twenty females(44.4%); seven teenagers (15.6%); ten patients in their 20s(22.2%); twenty patients in their 30S(44.4%); six patients in their 40s(13.3%); two patients in over 50s (4.4%) 2. The duration of the disease: 0 case within six months; three cases for six months to one year (6.6%); fourteen cases for one year to five years(31.1%); twenty six cases for over five years(62.2%) 3. Major symptoms; forty three cases for watery rhinorrhea (95.5%); thirty one caess for nasal itching(68.8%); 91.1 cases for sneezing(41.0%);thirty nine cases for nasal obstruction (86.6%); sixteen cases for difficulty in smelling(35.5%);seventeen postnasal drip(37.7%);three bloody rhinorrhea (6.6%);fourteen cases for headaches(31.1%); nine cases for eyelid itching (60.0%). 4. Seasonal Distribution: perennial allergic rhinitis occurred as follows: 55.6% in winter; 13.3% in fall; 11.1 % in spring;2.2% in summer. 5. Other combined allergic symptoms; sixteen cases for allergic conjunctives (37.8%); eight cases for sinus(17.8%);four cases for atopic dermatitis (8.9%); three cases for bronchial asthma(6.7%); sixteen cases for none(35.6%) 6. After a specific prescription of Quingbixiaoyanwan-Derivatives(淸鼻消炎丸), nasal cleansing solution and dietary therapy, the quality of life in allergic rhinitis patients was improved to 20.27%, which was significantly.(P<0.001) 7. The specific treatment did not affect GOT/GPT and BUN/Creatinine. 8. The specific treatment did not influence the level of total IgE serum significantly. Conclusions : Based on the above results, I have concluded that the specific treatment of Quingbixiaoyanwan-Derivatives(淸鼻消炎丸), nasal cleansing solution and dietary therapy can improve the quality of life in allergic rhinitis patients.
A study has been conducted on developing questionnaires to serve as on site diagnostic tools for the early detection of neuropsychiatric impairment among workers chronically exposed to low-level organic solvents. Two drafts of tentative questionnaires have been developed as follows; several question items were selected from questionnaires which were administered to workers exposed to organic solvents in previous studios and were grouped into each symptom category based on the presence of its association using Guttman scaling method, then these selected items were reviewed by neuropsychiatry specialists. The final draft of the questionnaire (total symptom score=36) was developed by selecting 33 question items which had more than a 0.88 Guttman coefficient of reproducibility in each symptom category from a pilot study in which these tentative questionnaires were administered to workers manufacturing soles. Three plants using organic solvents and one plant never using organic solvents as a control group were selected to test the reliability and validity of the developed questionnaires. The major organic solvent in the workplace environment detected by a personal air sampler and GC/MSD nab toluene. The concentration of toluene in air from the department using organic solvent was statistically different from that of the department never using organic solvent. The concentration of toluene from almost all of the workplace did not exceed the allowable level. There was no statistically significant difference between the concentration of urinary hippuric acid from the workers of the department using organic solvent and that of the department never using it. Total symptom score of the plant never using organic solvents was 9.8 and those of the three plants using organic solvents were 15.6, 14.7, and 13,7 respectively. In order to evaluate the validity of the questionnaires, the workers from two different departments of the plant in which usage of organic solvents are totally dofferemt were compared. The total symptom score was 17.8 for workers of the department using organic solvent and 13.5 for the department never using organic solvent and scores of each symptom group between exposure and non-exposure group also showed statistically significant difference. The finding that total symptom score of the exposure group increased as the duration of employment increased indirectly suggests the usefulness of the developed questionnaire to assess the health effects of chronic exposure to organic solvents. The correlation coefficient, which was calculated to evaluate the test-retest reliability, was 0.581 (p=0.001). The coefficient of Crohnbach which reflects the internal consistency of the questionnaire was 0.91. In conclusion, the reliabilty of the questionnaire was well maintained over the time lapse between the two administrations of the questionnaire and despite the seasonal difference.
Circadian rhythm is controlled by hormonal oscillations governing the physiology of all living organisms. In mammals, the main function of the pineal gland is to transform the circadian rhythm generated in the hypothalamic suprachiasmatic nucleus into rhythmic signals of circulating melatonin characterized by a largely nocturnal increase that closely reflects the duration of night time. The pineal gland has lost direct photosensitivity, but responds to light via multi-synaptic pathways that include a subset of retinal ganglion cells. Rhythmic control is achieved through a tight coupling between environmental lighting and arylalkylamine-N-acetyltransferase (AANAT) expression, which is the rhythm-controlling enzyme in melatonin synthesis. Previous studies on the nocturnal expression of AANAT protein have described transcriptional, post-transcriptional, and post-translational regulatory mechanisms. Molecular mechanisms for dependent AANAT expression provide novel aspects for melatonin's circadian rhythmicity. Extensive animal research has linked pineal melatonin for the expression of seasonal rhythmicity in many mammalian species to the modulation of circadian rhythms and to sleep regulation. It has value in treating various circadian rhythm disorders, such as jet lag or shift-work sleep disorders. Melatonin, also, in a broad range of effects with a significant regulation influences many of the body's physiological functions. In addition, this hormone is known to influence reproductive, cardiovascular, and immunological regulation as well as psychiatric disorders.
A clinical study of 106 cases of $Henoch-Sch{\ddot{o}}nlein$ purpura was made. The author analyzed the result of Korean traditional medical therapy. It was observed more frequently in female at the sex ratio of 1:1.3. The most prevalent age group was $4{\sim}9$ years(56.6%). In seasonal incidence, the cases were frequent during spring(50%), and the main specific history was upper respiratory tract infection(48.1%). The duration of contraction was $420.9{\pm}1079.3$ days. The adults were more chronic than children (p<0.05), The clinical manifestation showed in the skin (100%), the gastrointestinal tract(62.3%), the joints(64.2%), the kidney(25.3%), genitourinary system(11.3%), headache(6.6%), and scalp edema(4.7%) respectively. The first outbreak of symptoms was showing of skin purpura in 77 cases(72.6%) the highest frequency. and the gastrointestinal tract and joints were 16(15.1%) and 12 cases(11.3%) respectively. Of all patients, 22 cases(20.8%) experienced recurrences and 47 patients(44.3%) experienced hospitalization treatment. In the patients group which were recurrence experiences, the recurrence rate was high with patients(63.2%) who usually enjoyed meats and convenience foods and in patients(84%) who treated URI with chemical drugs(p<0.05). The patients group(68.9%) that took steroids also experienced a relatively high recurrence rate. Out of the patients(68.9%) who took treatment with steroids, 46.6% experienced side effects, in orders moon face(100%), weight gain(47.1%), appetite increase(52.9%), and acne. alopecia(11.8%), etc. There was a statistically significant relationship between the period of taking the steroid and the side effects(p<0.05), As the result of the herbal medicine treatment(treatment period: $6.7{\pm}6.2$ weeks, a follow-up survey during $15{\sim}24$ months), 67 patients(91.8%) among the 73 patients(68.9%) under 18 years old recovered completely but 3 cases(4.5%) recurred. 23 patients(69.7%) among the 33 patients(31.3%) above 19 years recovered completely but 5 cases(21.7%) recurred.
Macrobenthic fauna were collected seasonally using the van Veen Grab $(0,1/m^2)$ to investigate the benthic faunal assemblages on the soft-bottoms around the Youngjong Island during October 1991 to July 1992. A total of 266 species was identified. Of these polychaetes comprised 111 species $(41.7\%)$; crustaceans $75(28.2\%)$ molluscs, $59 (22.2\%)$ and others including echinoderms, $27(7.9\%)$. Mean density and biomass were estimated to be 498 $ind./m^2$ and 54.8$g./m^2$, respectively. Polychaetes were the most dominant faunal group in terms of abundance $(332\;ind./m^2)$ and number of species as well, whereas echinoderms were predominant in biomass $(332\;g./m^2)$. The dominant species were Mediomastus sp., Heteromastus sp., Nipponomysella oblongata, and Nephts polyranchia; the abundance of these species showed seasonal variations. The study area was divided into three regions by cluster analysis based on the similarity of species composition. The first region consisted of intertidal flat (G-I); the second, shallow subtital region of muddy sand (G-II); the third, channel region of mud sediments (G-III). The intertidal flat showed the highest density, and the channel was the lowest density, but the Highest in species diversity. Distribution of macrobenthic faunal assemblages of the study area seemed to be controlled by sedimentary facies and duration of tidal exposure.
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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제11권1호
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pp.1-10
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2006
Previous studies on zooplankton in Asan Bay were mostly based on samples collected seasonally with three months intervals. Present study was aimed to know the temporal variation of meso-zooplankton distribution using the data collected monthly. Relationships between zooplankton abundances and environmental factors such as seawater temperatures, salinities and chlorophyll-a contents were also studied. Seawater temperature showed typical pattern of seasonal variation found in temperate waters. The fluctuations of environmental factors ranged relatively wider In the inner part of the bay than those in outer part of the bay. Salinity was very low right after the summer rainy period due to the sporadic outflow of freshwater from the adjacent artificial lakes. Sudden changes in salinity seemed to have significant impact on zooplankton assemblages. Chlorophyll-a contents were increased in general when compared with previous reports probably due to the recent human exploitations in the coastal zone, which might enhance the nutrients level . The timing and duration of spring bloom showed geographical differences. In the inner part of the bay it began earlier (February) and last longer (three months) while in the outer part of the bay it began late (April) and last just one month. Zooplankton abundance, especially most abundant taxon Acartia hongi, showed weak but significant positive correlation with chlorophyll-a contents. The difference in temporal variation found with two different sampling intervals indicated the necessity of shorter time interval samplings.
This study was initiated to evaluate green color retention under three different soil systems. Several turfgrasses were evaluated in multi-layer, USGA, and mono-layer systems. Turfgrass entries were comprised of three cultivars of Korean lawngrass (Zoysia japonica Steud.) as warm-season grass (WSG) and three blends and three mixtures of Kentucky bluegrass (KB, Poa pratensis L.), perennial ryegrass (PR, Lolium perenne L.), and tall fescue (TF, Festuca arundinacea Schreb.) as cool-season grass (CSG). Significant differences were observed in visual turf color and green color retention among soil systems and turfgrasses. Both the multi-layer and USGA systems were highly associated with better color ratings and longer color retention, as compared with the mono-layer system. Seasonal variation of visual turf color greatly occurred from late December to early spring. CSG exhibited longer color retention than did WSG. The latter maintained green color for approximately 6 months, regardless of the soil system. Spring green-up of Korean lawngrass occurred from early to middle May, while it underwent discoloration from late October to early November. Among the CSGs green-up occurred between early March and early April and leaf color was maintained until middle December to early February. Therefore, the CSGs were green for 8.5 to 11 months, depending on turfgrass and soil system. The mean period of green color duration across all soil systems was approximately 10-11, 9-10 and 8.5-9.0 months for PR, KB and TF, respectively. As for the CSG mixtures, the greater the proportion of PR, the longer the green color retention, while the higher the proportion of TF, the shorter the color retention. There was greater variation in green color duration among the CSGs than the WSGs. Across soil systems, color retention differences of 2 to 6 days were observed for the Korean lawngrass, but 7 to 36 days for the CSGs. These results demonstrate that green color retention varied greatly according to soil systems and also among turfgrasses. Selections of turfgrass and soil system should be made using a concept-oriented approach, when establishing garden, park, soccer field, golf course and other sports field. Information obtained in this study can be used to select soil systems and turfgrasses based on the expected degree of leaf color retention.
The red fox (Vulpes vulpes) is currently identified as a restoration target species, because it is listed as level 1 in the Korean National Park Service's endangered species list. The present research was conducted to investigate the basic behavioral patterns distribution of red foxes. For this study, red foxes under semi-natural conditions were observed and recorded from May 2012 to April 2013. The results revealed that the activities of the red foxes began at $16:59{\pm}01:20t$ and ended at an average time of $05:50{\pm}03:02t$. The males began and ended their activities earlier than their female counterparts. Among the seasonal activity durations, the longest activity duration was observed in summer with activity of 14 hours and 5 minutes, while the shortest activity duration was observed in winter with activity periods of 10 hours and 11 minutes. Generally, the red foxes exhibited a nocturnal behavioral pattern; the activity start time of the foxes was influenced by the sunset time. However, the activity end time showed no relationship with the sunrise time. The frequency of daily feeding activity ranged from one to eight times per day, with the males ($2.40{\pm}1.66$) exhibiting higher frequency than their female counterparts ($1.87{\pm}1.24$). The feeding activity peaked in November (average, 3.52 times per day) and was lowest in January (average, 1.28 times per day). Both males and females engaged in daily drinking activity (average, $2.03{\pm}1.296$ times per day). Thus, the increase in the frequency of the feeding activity is related to increase in the frequency of the drinking activity. Although the present research was conducted under semi-natural condition, the findings will be useful for the daily specification management of the species, monitoring of the released foxes, and habitat management based on the behavioral characteristics of the species.
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