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제주도 지하수 질산염 농도의 시·공간적 변화 특성: 장기(1993-2015) 모니터링 자료의 평가
김호림(Ho-Rim Kim),오준섭(Junseop Oh),도현권(Hyun-Kwon Do),이경진(Kyung-Jin Lee),현익현(Ik-Hyun Hyun),오상실(Sang-Sil Oh),감상규(Sang-Kyu Kam),윤성택(Seong-Taek Yun) 대한자원환경지질학회 2018 자원환경지질 Vol.51 No.1
1993년부터 2015년까지 관측된 제주도 지하수 장기모니터링 관측정(N = 4,835)에서 수집된 지하수 수질자료(N = 21,568)를 기반으로 질산성질소의 시공간적 변동 특성을 평가하였다. 제주도 지하수의 질산성질소 농도의 중앙값은 2.5 mg/L로서 다른 국가나 대륙의 조사 결과에 비해 다소 높거나 유사한 것으로 나타났다. 또한 지하수 용도, 행정구역 및 고도 별로 유의한 차이를 보였다. 특히, 산간 지역에 비해 저지대 해안가에 위치한 농업 및 주거지역에서 농도가 높음을 확인하였다. Mann-Kendall 및 Sen’s slope 분석을 활용한 질산성질소 농도의 추세 분석 결과, 하류 저지 대에 비해 중산간지역에서의 질산성질소 농도 증가 경향이 뚜렷하였다. 제주도 내 토지 피복의 시계열 변화 특성과 결부 지어 보면, 중산간지역의 오염 증가 추세는 농업지역의 확장 등 인위적 활동 증가에 기인한 결과로 판단된다. 반면,기지정된 지하수자원특별관리구역에서는 전반적으로 질산성질소 농도의 감소 경향이 나타났는데, 이는 지하수 관리 측면에서 수질관리를 위한 적극적인 정책이 유효함을 시사한다. 본 연구에서는 제주도 지하수의 질산성질소 오염관리를 위한 적정 방안을 제안한다. The spatio-temporal variations of nitrate concentrations in groundwater of Jeju Island were evaluated by an analysis of time series groundwater quality data (N = 21,568) that were collected from regional groundwater monitoring (number of wells = 4,835) for up to 20 years between 1993 and 2015. The median concentration of NO 3 -N is 2.5 mg/L, which is slightly higher than those reported from regional surveys in other countries. Nitrate concentrations of groundwater in wells tend to significantly vary according to different water usage (of the well), administrative districts, and topographic elevations: nitrate level is higher in low-lying agricultural and residential areas than those in high mountainous areas. The Mann-Kendall trend test and Sen’s slope analysis show that nitrate concentration in mid-mountainous areas tends to increase, possibly due to the expansion of agricultural areas toward highland. On the other hand, nitrate concentrations in the Specially Designated Groundwater Quality Protection Zones show the temporally decreasing trend, which implies the efficiency of groundwater management actions in Jeju. Proper measures for sustainable groundwater quality management are suggested in this study.
종 분포 모형을 이용한 구상나무림의 지속 및 쇠퇴에 관한 연구 - 전라남도 광양시 백운산을 중심으로 -
조선희 ( Seon Hee Cho ),박종영 ( Jong Young Park ),박정호 ( Jeong Ho Park ),이양근 ( Yang Geun Lee ),문이만 ( Lee Man Mun ),강상호 ( Sang Ho Kang ),김광현 ( Gwang Hyun Kim ),윤종국 ( Jong Guk Yun ) 한국산림과학회 2015 한국산림과학회지 Vol.104 No.3
The present study investigated the habitats of Korean fir trees (Abies koreana E. H. Wilson) on Mt. Baekwun (Baekwun-san), determined the current distribution, quantified the contribution of biological and nonbiological environmental factors affecting the distribution, derived actual and potential habitats, presented a plan for the establishment of protected areas, applied RCP 8.5 climate change scenario to analyze the effects of climate change on the future distribution of Korean fir trees, and predicted future potential habitats. According to the results of the study, 3,325 Korean fir trees (DBH >= 2.5 cm) inhabited Mt. Baekwun, and their distribution area was approximately 150 ha. Populations of Korean fir trees were confirmed to exist at an altitude of 900 m above sea level and were distributed up to 1,200 m. Based on potential distribution, areas appropriate for habitation by Korean fir trees were analyzed to be 450 ha, three times the current distribution area, with a focus on Sang Peak (Sang-bong), Eokbul Peak (Eokbul-bong), Ddari Peak (Ddari-bong), and Dosol Peak (Dosol-bong). The forest stands near Sang Peak, the main peak, were evaluated as those with the most appropriate potential for the habitation of Korean fir trees, and populations of the trees tended to prefer the northern slope rather than the southern slope. When climate change scenario RCP 8.5 was applied and future potential distribution was analyzed, the habitats were expected to decrease in area to 20 ha by 2050, with a focus on Sang Peak, and areas appropriate for habitation were predicted not to exist by 2080. Judging from such results, as global warming accelerates, the habitats of Korean fir trees are clearly expected to move from lowlands to highlands.
Changes in Quality of Dried Rice Cake Using Perforation Process and Drying Methods
Yun-Sang Choi,Jong-Dae Park,Jung-Min Sung,Hae-Won Jang,Tae-Kyung Kim,Hyun-Wook Choi 한국산업식품공학회 2019 산업 식품공학 Vol.23 No.2
Korean sliced rice cakes, or tteokguk, are conventionally dried and rehydrated during their preparation. In this study, the effects of the perforation process and various drying methods (e.g., hot-air drying, vacuum drying, low temperature drying, and freeze drying) on the quality characteristics of tteokguk (rice cake soup) were evaluated. In the experiment, the rehydration capacity and lightness increased as the pore number increased. The hardness, redness, and yellowness of tteokguk, in contrast, tended to decrease as perforations increased. The texture, taste, and overall acceptability scores of tteokguk increased as perforations increased. With respect to drying methods, the rehydration capacity was greatest for vacuum drying. The hardness of tteokguk was lowest for vacuum drying. The redness, yellowness, pH, and sensory characteristics did not differ significantly among tteokguk samples treated through various drying methods. These results suggest that high-quality ready-to-eat Korean sliced rice cakes could be created by perforation and vacuum drying.
Correlation between various hormonal parameters and metabolic parameters in Korean PCOS patients
( Sung Wook Chun ),( Yun Hee Koo ),( Gyun Ho Jeon ),( Hyun Jin Cho ),( Yong Il Ji ) 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.98 No.-
The aim of this study was to investigate the relationship between various hormonal parameters and metabolic parameters in Korean women with polycystic ovarian syndrome (PCOS). A total of 112 Korean women aged 18-32 years who were diagnosed PCOS first in 2 university hospitals were included in this study. The correlation between hormonal parameters including day 3 serum serum anti-Mullerian hormone (AMH) level, luteinizing hormone/follicle stimulating hormone (LH/FSH) ratio and estrone/estradiol (E1/E2) ratio and metabolic parameters including fasting serum glucose and insulin levels, fasting glucose/insulin ratio, homeostatic model assessment of insulin resistance (HOMA-IR), serum lipid profiles and serum transaminase levels were analyzed using Pearson correlation coefficients after adjustment of age and body mass index (BMI). Mean serum AMH level was 9.18 ± 4.18 ng/ml, mean LH/FSH ratio was 1.80 ± 1.06 and mean E1/E2 ratio was 2.15 ± 1.37. Among the three hormonal parameters, AMH levels and LH/FSH ratios were significantly correlated with each other. After adjustment of age and BMI, none of the three hormonal parameters was significantly correlated with any metabolic parameters in PCOS patients. Our results suggest that basal serum AMH level, LH/FSH ratio and E1/E2 ratio may not be associated with metabolic status in Korean PCOS patients.
( Hyun Min Seo ),( Jae Yun Lim ),( Ju Yeon Choi ),( Han Saem Kim ),( Jung In Kim ),( Jung Min ),( Sang Hyeon Hwang ),( Ho Joo Jung ),( Jae Hui Nam ),( Ga Young Lee ),( Won Serk Kim ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1
Seborrheic keratoses are the most common tumor of the epidermis. For clearly benign and cosmetically unwanted lesions, destruction with cryosurgery, electrodesiccation, curettage, or ablative laser systems have been shown to be effective. However, common complications of these destructive therapies include scarring, pigmentary change, incomplete removal, or recurrence. It is more desirable to ensure that the method of removal minimizes the risk of scarring. Trichloroacetic acid (TCA) is a versatile peeling agent and widely used for medium-depth peeling. The higher the concentration or the amount of the TCA applied, the more intense the destructive effect is. Therefore, it may represent a new strategy for skin tumor treatment. We report the case series of eleven patients diagnosed as seborrheic keratosis on the scalp who were treated with focal application of 100% TCA solution between 2011 and 2014. Clinical improvement was evaluated using the 5-point global assessment scale (GAS). Eight of eleven patients (72.7%) had good (50-75% clearance) or excellent (75-100% lesion clearance) results by GAS. No complications, such as scarring alopecia, erythema, or pigmentary changes, were observed. In conclusion, the focal application of 100% TCA for the treatment of seborrheic keratosis on the scalp was clinically effective and safe therapy that can minimize the risk of scarring alopecia.
A Study on the Modeling and Control Method of PWM DC/DC Converter with Isolated two outputs
Sang-Hyun Jang,Ji-Yoon Yoo,Dong-Yun Lee,Ick Choy,Joong-Ho Song 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents the circuit modeling and control methods of PWM DC/DC converter with isolated dual outputs The dual output converter consists of a transformer with a single secondary winding and two switches. The proposed control algorithm is that required inductor current according to the loads is feed-forwarded to the PI current controller The proposed control method has better response characteristics than conventional PI control method at load change.<br/>
Value of Early Referral for Sperm Cryopreservation in Young Men with Cancer
( Sang Hoon Lee ),( Yong Jin Kim ),( Kyong Wook Yi ),( Hyun Tae Park ),( Jae Yun Song ),( Sun Haeng Kim ),( Tak Kim ) 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.98 No.-
The purpose of this study was to determine the quality of sperm and to evaluate the value of early referral to reproductive specialists for sperm banking in young men with cancer. Data was included in cancer patients who underwent sperm cryopreservation for fertility preservation at the university hospital from April 1998 to October 2011. Secondary analysis of prospective database was performed to evaluate the sperm quality in cancer patients. Of the 51 patients with 92 freezing cycles, data was available in 45 patients with 85 cycles (mean age 27.1±7.3). Thirty three patients were referred before chemotherapy (PreCTX) and 12 were after chemotherapy (PostCTX). Of the 85 cycles, 95.3% (volume), 77.6% (motility), and 44.7% (count) were lower than the normal values for semen analysis. In the PreCTX, 14 had single sperm collection (SSC) and 14 had multiple collections (MSC). There was significant difference in the mean-time of referral in the SSC vs MSC (3.2±3.6 vs 21.2±26.0, p=0.02), Five out of 33 in the PreCTX had additional sperm collection after chemotherapy due to the lack of sperm quality and quantity. Three out of those were referred on the first day of chemotherapy. Patients who were referred 5 days before chemotherapy enable multiple collections. Early referral for sperm banking before chemotherapy should be considered as an essential factor for fertility preservation since the quality of sperm in cancer patients tends to be lower than normal patients, when appropriate, enables multiple fertility preservation cycles. This is the first study demonstrating the benefit of early referral for sperm banking in cancer patients.
A case of cervical chondrocutaneous branchial remnants
( Sang Hyeon Hwang ),( Jae Yun Lim ),( Ju Yeon Choi ),( Han Saem Kim ),( Jung In Kim ),( Jung Min ),( Hyun Min Seo ),( Ho Joo Jung ),( Jae Hui Nam ),( Ga Young Lee ),( Won Serk Kim ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1
Cervical chondrocutaneous branchial remnants are rare developmental anomalies of the brachial apparatus which appear as a firm, protruding papule or nodule on the neck along the line of anterior border of the sternocleidomastoid muscle. Primitive branchial embryonic tissues migrate into the final lateral facial position to form the adult derivatives of head and neck. However, failure of proper migration, fusion, or maturation of the branchial apparatus components results in a variety of congenital defects. Most branchial cysts and fistulae are considered to be derived from the first and second branchial clefts. Of these, cervical chondrocutaneous branchial remnants are infrequent, whereas branchial cysts and sinuses are relatively more common. Our patient, a 9-month-old girl, presented with a solitary skin-colored about 0.4 cm sized soft papule on the lower third of the left neck. The lesion had been presented at birth and physical examination revealed no remarkable findings except for the skin lesion. The histopathologic examination revealed normal epidermis and characteristic cartilage core in the dermis without connection to the epidermis. The histopathological features were consistent with cervical chondrocutaneous branchial remnants.