FLDWAV model was modified such that it can adequately simulate the effect of Jamsil and Singok submerged weirs in the main reach of the Han River. The enhanced model combines weir-type discharge equations for overflow at fixed weir and Manning equation for fluvial-type flow at the movable weir. Equations for weir overflow include those for submerged weir flow and free overflow. Gates of the movable weir may be open or closed for the simulation. In order to test the simulation capabilities, the enhanced model was applied for various flow conditions at submerged weirs. Backwater effect due to Jamsil and Singok submerged weirs were well simulated. Simulations were carried out for spring and neap tides extracted from artificial tide generated by combining $M_2\;and\;S_2$ tidal constituents. Simulation results cleared indicated that tidal effect extends further upstream as the flood discharge decreases. Low flow simulation capabilities of the enhanced model was tested. Discontinuities of water surface elevation due to the submerged weirs were successively simulated.
This study was developing group counseling program for sexual education for Christian young adults. and its effects were proven. For this purpose, this study of unmarried Christian young adults ranging 30 from the age 20~35 years old who are attending church C and S located in city of C at Kyungnam province. The subject and control group each had 15 people who separately participated in this program once a week for 120 minutes, 12 times in total. The control group did not receive any feedback after the sessions. group counseling program for sexual education was based on Crabb's biblical counseling model and McMinn's cognitive therapy. Using 12 kinds of cognitive therapy techniques. for its effects were verified. used The sexual knowledge scale standardized model of a college student set by Jeon Gyungsook, Lee Hyoyoung, Lee Seonja, The sexual attitude scale standardized model for a college student set by Ho Seonmin, The sexual decision making scale developed by Sun Mikyung. The data analysis consisted of Cronbach's α test, χ2-test, Mann-Whitney U test, Friedman test, a χ nd Wilcoxon signed-rank test. The result of this study is improve the sexual knowledge, show the conservative tendency of sexual attitudes, and prove the increase in the ability to make responsible sexual decisions of Christian young adults. Following up, this study spreads awareness of the true meaning of sexual being as illustrated from the bible and implies a beneficial program within the church that promotes a healthy life and reconciliation between self, neighbors, and God in a life according to the purpose of creation and order.
Understanding effects of thermal pollution and acidification has long been a concern of aquatic ecologists, but it remains largely unknown in Korea. This study was performed to elucidate the effects of thermal wastewater effluent (TWE) and acid rain on water quality and attached algae in a small mountain stream, the Buso Stream, a tributary located in the Hantan River basin. A total of five study sites were selected in the upstream area including the inflowing point of hot-spring wastewater (HSW), one upstream site (BSU), and three sites below thermal effluent merged into the stream (1 m, 10 m and 300 m for BSD1, BSD2, and BSD3, respectively). Field surveys and laboratory analyses were carried out every month from December 2015 to September 2016. Water temperature ranged $1.7{\sim}28.8^{\circ}C$ with a mean of $15.0^{\circ}C$ among all sites. Due to the effect of thermal effluent, water temperature at HSW site was sustained at high level during the study period from $17.5^{\circ}C$ (January) to $28.8^{\circ}C$ (September) with a mean of $24.2{\pm}3.7^{\circ}C$, which was significantly higher than other sites. Thermal wastewater effluent also brought in high concentration of nutrients(N, P). The effect of TWE was particularly apparent during dry season and low temperature period (December~March). Temperature effect of TWE did not last toward downstream, while nutrient effect seemed to maintain in longer distance. pH ranged 5.1~8.4 with a mean of 6.9 among all sites during the study period. The pH decrease was attributed to seasonal acid rain and snow fall, and their effects was identified by acidophilic diatoms dominated mainly by Eunotia pectinalis and Tabellaria flocculosa during March and August. These findings indicated that water quality and periphyton assemblages in the upstream region of Buso Stream were affected by thermal pollution, eutrophication, and acidification, and their confounding effects were seasonally variable.
Park, Kyung-Woo;Kim, Yun-Sam;Park, Jung-Won;Jeune, Kyung-Hee;Kim, Mi-Kyung
Korean Journal of Ecology and Environment
/
v.44
no.2
/
pp.239-251
/
2011
To compare the different water environments in the Jigsaw stream (st. 1, 2) and Jujin stream (st. 3, 4) crossing over the Byeonsan-Bando and Seonunsan parklands, the physico-chemical factors and the species compositions of epilithic diatoms were analyzed from March 2009 to February 2010. The mean values of conductivity (681.1 ${\mu}S\;cm^{-1}$), suspended solids (27.83 mg $L^{-1}$), biological oxygen demand (3.15 mg $L^{-1}$), total nitrogen (3.24 mg $L^{-1}$), total phosphorus (0.24 mg $L^{-1}$) and chlorophyll-${\alpha}$ (12.99 mg $m^{-3}$ ) in Jujin stream were significantly higher than each element in Jigsaw stream. Eighty taxa were classified into 73 species and seven varieties belonging to 24 genera, eight families, three suborders and two orders in Jigsaw stream. Eighty eight taxa were classified into 81 species and seven varieties belonging to 22 genera, seven families, three suborders and two orders in Jujin stream. Biological water quality assessments revealed that Jigsaw stream was ${\beta}$~${\alpha}$-oligosaprobic and Jujin stream was ${\beta}$-mesosaprobic. Dominant and diversity indices were indicated from 0.25~0.81 and from 1.73~4.14 in Jigsaw stream, respectively, and from 0.29~0.64 and from 2.72~4.02 in Jujin stream, respectively. Jujin stream was more eutrophic than those of Jigsaw stream. The different water environments between the two streams could be due to the different ecosystems of the neighboring basins of each stream crossing over in the mountain. Further studies should investigate the water environments of two streams by continuous and regular monitoring to analyze the different ecosystem mechanisms.
Objectives: The purpose of this study was to determine the optimal master apical file size with minimal transportation and optimal efficiency in removing infected dentin. We evaluated the transportation of the canal center and the change in untouched areas after sequential preparation with a #25 to #40 file using 3 different instruments: stainless steel K-type (SS K-file) hand file, ProFile and LightSpeed using microcomputed tomography (MCT). Materials and Methods: Thirty extracted human mandibular molars with separated orifices and apical foramens on mesial canals were used. Teeth were randomly divided into three groups: SS K-file, Profile, LightSpeed and the root canals were instrumented using corresponding instruments from #20 to #40. All teeth were scanned with MCT before and after instrumentation. Cross section images were used to evaluate canal transportation and untouched area at 1-, 2-, 3-, and 5- mm level from the apex. Data were statistically analyzed according to 'repeated nested design' and Mann-Whitney test (p = 0.05). Results: In SS K-file group, canal transportation was significantly increased over #30 instrument. In the ProFile group, canal transportation was significantly increased after preparation with the #40 instrument at the 1- and 2- mm levels. LightSpeed group showed better centering ability than ProFile group after preparation with the #40 instrument at the 1 and 2 mm levels. Conclusions: SS K-file, Profile, and LightSpeed showed differences in the degree of apical transportation depending on the size of the master apical file.
Oh, Chang Whan;Kim, Won Jeong;Lee, Seung Hwan;Lee, Bo Young;Kim, Jin Seok;Choi, Seung Hyun
The Journal of the Petrological Society of Korea
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v.28
no.4
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pp.251-277
/
2019
The Gogunsan Archipelago is composed of two island groups; the first group includes Mal-do, Myeong-do, Gwangdae-do, and Bangchuk-do islands consisting of Neoproterozoic rocks, and the second group includes Yami-do, Sinsi-do, Muneo-do, Jangja-do, and Seonyu-do islands consisting of Cretaceous rocks. The first group mainly consists of the Bangchuk formation which can be divided into two layers; the lower layer was more deformed than the upper layer. The former was intruded by mafic and felsic volcanic rocks formed in the volcanic arc tectonic setting 930-890 Ma and the latter was deposited ca. 825-800 Ma. In these islands, large scale folds with east-west fold axes were beautifully formed; the Maldo island fold was designated as natural monument and large scale beautiful chevron fold was developed on the Gwangdae-do island. In addition, there are unique zebra-shaped outcrop formed by a mixing of basic and acidic magma and Independent Gate shaped outcrop formed by coastal erosion. On the other hand, the Yami-do, Sinsi-do, Muneo-do, Jangja-do and Seonyu-do islands consist of 92-91Ma Cretaceous volcanic rocks and, in Sinsi-do island, the Nanshan formation deposited ca. 92 Ma. These Cretaceous volcanic rocks formed by melting of the continental crust by the heat supplied from the uplifting mantle due to the extension caused by a retreat of subducting ocean slab. Yami-do and Sinsi-do islands are composed of rhyolite. In Yami-do island, bands with vertical joint formed by cooling of the bottom part of the lava, are shown. In Sinsi-do island, large-scale vertical joints formed by cooling of lava flow, were developed. The Jangja-bong of Jangja-do island and Mangju-bong of Seonyu-do island are composed of brecciated rhyolite and formed a ring shaped archipelago contributing to the development of marine culture by providing natural harbor condition. They also provide beautiful views including 'Seonyu 8 views' along with other islands. As mentioned above, the Gogunsan archipelago is rich in geoheritages and associated cultural and historical resources, making it worth as a National Geopark.
Jeon, Kyeongman;Chung, Man Pyo;Shin, Sung-Chul;Yu, Chang Min;Koh, Won-Jung;Suh, Gee Young;Kim, Hojoong;Kwon, O Jung;Kim, Tae Sung;Lee, Kyung Soo;Han, Joungho
Tuberculosis and Respiratory Diseases
/
v.55
no.2
/
pp.175-187
/
2003
Background : Although corticosteroid and cytotoxic agent such as cyclophosphamide have been used for the treatment idiopathic interstitial pneumonia (IIP), efficacy of these toxic drugs are unclear because previous reports included the patients who did not undergo surgical lung biopsy and none evaluated the response according to histopathologic entities of IIP. To answer this, we retrospectively analyzed the treatment response and side effects of corticosteroids and cyclophosphamide therapy in patients with idiopathic UIP and NSIP. Methods : Among 61 patients with UIP and 26 patients with NSIP diagnosed by surgical lung biopsy at Samsung Medical Center from July 1996 to June 2002, those who received corticosteroid or cyclophosphamide therapy for at least 6 months and were followed for at least one year after the initiation of treatment were enrolled (32 UIP, 23 NSIP). Treatment response of 55 patients was assessed by ATS response criteria (clinical symptoms, pulmonary function test and radiological findings). Adverse reactions to either agent (42 cases of cyclophosphamide${\pm}$low-dose prednisolone, 49 cases of prednisolone alone) were also analyzed. Results : Irrespective of treatment regimen, NSIP showed more favorable response than UIP (6 months: 78.3% vs. 9.4%, 12 months: 69.6% vs. 9.4%, p<0.001). Cyclophosphamide showed comparable response to corticosteroid in NSIP while its efficacy was as poor as those of corticosteroid therapy in UIP. Significant adverse reaction to drug more frequently occurred in corticosteroid group (35.7%) than cyclophosphamide group (14.3%) (p=0.017). Conclusion : Cyclophosphamide is effective and more tolerable than corticosteroids in the treatment of idiopathic nonspecific interstitial pneumonia.
Jeon, Kyeongman;Koh, Won-Jung;Kwon, O Jung;Kang, Eun Hae;Suh, Gee Young;Chung, Man Pyo;Kim, Hojoong;Kim, Tae Sung;Lee, Kyung Soo;Lee, Nam Yong;Han, Joungho
Tuberculosis and Respiratory Diseases
/
v.57
no.3
/
pp.242-249
/
2004
Background : Because of the low sensitivity of sputum smear and culture, diagnosis of nontuberculous mycobacterium (NTM) pulmonary disease, especially in patients with bronchiectasis, is often difficult. We investigated the usefulness of bronchoscopy for the diagnosis of NTM pulmonary disease including M. avium complex (MAC) and M. abscessus in patients with bronchiectasis and multiple pulmonary nodules on chest computed tomography (CT). Methods : We reviewed 48 cases of patients who were performed bronchoscopic bronchoalveolar lavage (BAL) and transbronchial lung biopsy (TBLB) under suspect of NTM pulmonary disease based on CT findings of bronchiectasis and multiple nodules from April 2002 to June 2003. Results : Twenty five of the 48 patients (54%; 12 MAC, 14 M. abscessus) were diagnosed as NTM pulmonary disease on the basis of the American Thoracic Society diagnostic criteria for NTM pulmonary disease. Sixteen of the 21 patients (76%; 5 MAC, 11 M. abscessus) with 3 or more positive sputum cultures of NTM were confirmed tissue invasion by TBLB. Five of the 24 patients (21%; 4 MAC, 1 M. abscessus) who could not be diagnosed with sputum cultures were diagnosed by bronchoscopic BAL and TBLB. Conclusion : Bronchoscopy is helpful for the diagnosis of NTM pulmonary disease and confirmation of tissue invasion by NTM, not only MAC but also M. abscessus, in patients with bronchiectasis and multiple nodules on chest CT scan.
Yu, Chang-Min;Koh, Won-Jung;Ryu, Yon Ju;Jeon, Kyeongman;Choi, Jae Chol;Kang, Eun Hae;Suh, Gee Young;Chung, Man Pyo;Kim, Hojoong;Kwon, O Jung;Lee, Jang Ho;Ki, Chang-Seok;Lee, Nam Yong
Tuberculosis and Respiratory Diseases
/
v.57
no.6
/
pp.528-534
/
2004
Background : Microscopic examination of sputum smears for acid-fast bacilli (AFB) is the most important and rapid diagnostic test for pulmonary tuberculosis. However, the AFB observed on the smear may represent either M. tuberculosis or nontuberculous mycobacteria (NTM). This study examined the clinical usefulness of a polymerase chain reaction test for M. tuberculosis (TB-PCR) for the differentiation of pulmonary tuberculosis and NTM lung disease in patients with smear-positive sputums in a tertiary hospital in Korea. Material and Methods : From January, 2003 to December, 2003, 826 AFB smear-positive and culture-positive sputum specimens were collected from 299 patients. Results : NTM were recovered from 26.6% (220/826) of the smear-positive sputum specimens and 23.4% (70/299) of the patients with smear-positive sputum. All the patients with isolated NTM had clinically significant NTM lung disease; 38 patients (54.3%) had M. avium and 26 patients (37.1%). had M. abscessus. In the patients with pulmonary tuberculosis, 78.7% of the patients (74/94) showed TB-PCR positivity, and all the patients with NTM lung disease showed negative results on the TB-PCR test (p<0.001). A positive result of the TB-PCR test on the sputum or bronchial washing fluid specimens was able to predict pulmonary tuberculosis with 88.4% sensitivity, 100% specificity, a 100% positive predictive value and a 79.7% negative predictive value for the patients with smear-positive sputum. Conclusion : The TB-PCR test for sputum specimens or bronchial washing fluid specimens could be useful for differentiating pulmonary tuberculosis and NTM lung disease for the patients with smear-positive sputum in Korea.
Choi, Jae Chol;Koh, Won-Jung;Kwon, Yong Soo;Ryu, Yon Ju;Yu, Chang-Min;Jeon, Kyeongman;Kang, Eun Hae;Suh, Gee Young;Chung, Man Pyo;Kim, Hojoong;Kwon, O Jung;Kim, Tae Sung;Lee, Kyung Soo;Han, Joungho
Tuberculosis and Respiratory Diseases
/
v.58
no.6
/
pp.576-581
/
2005
Background : Thoracic actinomycosis is a relatively uncommon anaerobic infection caused by Actinomyces israelii. There have been only a few case reports of endobronchial actinomycosis. The aim of this study was to evaluate the clinical manifestation and treatment of endobronchial actinomycosis. Material and Methods : Seven patients with endobronchial actinomycosis, who were diagnosed in the past 10 years, were retrospectively reviewed. Results : Cough and sputum were the most common symptoms. The chest radiograph and computed tomography showed necrotic consolidation (n=3), atelectasis (n=2), mass (n=1) and an endobronchial nodule (n=1). Proximal broncholithiasis was observed in five patients. All cases were initially suspected to have either lung cancer or tuberculosis. In these patients, the median duration of intravenous antibiotics was 3 days (range 0-12 days) and the median duration of oral antibiotics was 147 days (range 20-412 days). Two patients received oral antibiotic therapy only. There was no clinical evidence of a recurrence. Conclusion : Endobronchial actinomycosis frequently manifests as a proximal obstructive calcified endobronchial nodule that is associated with distal post-obstructive pneumonia. The possibility of endobronchial actinomycosis is suggested when findings of broncholithiasis are present at chest CT. The traditional recommendation of 2-6 weeks of intravenous antibiotics and 6-12 months of oral antibiotic therapy are not necessarily essential in all cases of endobronchial actinomycosis.
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