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Comparison of litterfall production in three forest types in Jeju Island, South Korea

Journal of Forestry Research 2020年第3期31卷 945-952页

作者： Ji Young An Si Ho Han Woo Bin Youn Sang Ick Lee Afroja Rahman Huong Thi Thuy Dao Jeong Min Seo Aung Aung Hyung-Soon choi hwa Ja Hyun Byung Bae Park Department of Natural Resources Kyoto UniversityKyoto 606-8502Japan Department of Environment and Forest Resources Chungnam National UniversityDaejeon 34134Republic of Korea Forest Environment Conservation Division Korea Forest ServiceDaejeon 35208Republic of Korea Forest Conservation Department National Institute of Forest ScienceSeoul 02455Republic of Korea Warm Temperate and Subtropical Forest Research Center National Institute of Forest ScienceSeogwipo 63582Republic of Korea

Litterfall, which is influenced by physical and biological factors, is a major pathway for carbon and nutrient cycling in forest ecosystems. The purpose of this study was to investigate monthly litterfall production in three forests in Jeju Island differentiated by forest composition and precipitation: Cheongsu(Quercus glauca as the dominant species;low precipitation), Seonheulb(Q. glauca as the dominant species;high precipitation), and Seonheulm(Q. glauca and Pinus thunbergii as the dominant species;high precipitation). Litterfall was collected monthly from April to December 2015 and divided into leaf litter, twig, bark, seeds, and unidentified *** patterns of litterfall production varied across stands according to their species composition. However,the amount of leaf litterfall and total litterfall were comparable among stands, ranging from 362 to 375 g m-2 for leaf litter and 524 g m-2 to 580 g m-2 for total *** leaf litter in May was the highest in all stands, while needle litter was the highest in December in *** twig litterfall in July may be attributable to high rainfall with strong winds and storms during the rainy season. Although forest type and climate factor had no influence on litterfall amounts in this study, the pattern of litterfall production was species dependent, suggesting diverse effects on carbon and nutrient cycling in these forests.

关键词： Coniferous forest Evergreen broadleaved forest Gotjawal Leaf litter Precipitation Temperature

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PIV Measurement of Velocity Distribution in the Moderator Circulation Test (MCT)

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Journal of Power and Energy Engineering 2014年第9期2卷 74-80页

作者： Hyoung Tae kim Bo Wook Rhee hwa-Lim choi Severe Accident and PHWR Safety Research Division Korea Atomic Energy Research Institute (KAERI) Daejeon Republic of Korea

Korea Atomic Energy Research Institute (KAERI) has been carrying out a scaled-down moderator test program to simulate the CANDU-6 moderator circulation phenomena during steady state operation and accident conditions. The Moderator Circulation Test (MCT) facility was designed and constructed as 1/4 scale of the prototype of CANDU-6 reactor. In the present work spatial distribution of two-dimensional velocity in the MCT facility under isothermal condition was measured using planar Particle Image Velocimetry (PIV) system which consists of double pulsed laser, synchronizer, and high speed camera. TSI’s Insight TM 4G software was used to perform PIV image capturing, PIV calculation and post processing. 10 μm sized silver-coated hollow sphere particles were used as flow tracer particles. Multiple experiments were conducted to cover large area of the MCT facility with limited field of view of a single camera. Instantaneous and averaged velocity field were analyzed for each spatial position and flow rate. This research is capable of offering validation data for self-reliant CFD tools to predict moderator subcooling margin in CANDU-6 reactor.

关键词： PIV CANDU-6 Moderator Circulation Test (MCT) Moderator Subcooling

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Serial evaluation of myocardial function using the myocardial performance index in Kawasaki disease

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World Journal of Pediatrics 2018年第3期14卷 259-268页

作者： Eun Song Song Somy Yoon Joo Hyun Cho Eun Mi Yang hwa Jin Cho Young Youn choi Jae Sook Ma Gwang Hyeon Eom Young Kuk Cho Department of Pediatrics Chonnam National University HospitalChonnam National University Medical School42 Jebong-roDong-guGwangju 501-757South Korea Department of Pharmacology and Medical Research Center for Gene Regulation Chonnam National University Medical School160 Baekseo-roDong-guGwangju 61469South Korea Department of Pediatrics KS HospitalGwangjuSouth Korea

Background Kawasaki disease (KD) is known as systemic vasculitis, and more than half of the patients with KD have myo-carditis, which can induce ventricular dysfunction. In this study, we evaluate left ventricular (LV) dysfunction in patients with KD based on the myocardial performance index (MPI) using pulse Doppler (PD) and tissue Doppler imaging (TDI), from the acute to convalescent phases. Methods We retrospectively studied 89 children diagnosed with KD from January 2010 to August 2012. We assessed the presence of coronary artery lesions (CALs) and the LV ejection fraction, PD-MPI, and TDI-MPI at diagnosis, and 2, 14, and 56 days after intravenous immunoglobulin (IVIG) treatment. We enrolled 70 healthy children as a control group. Results The ejection fraction in patients with KD at diagnosis (67.3 ± 0.9%) was lower than that in the control group (69.8 ± 0.8%,P = 0.035), and the LV TDI-MPIs for patients with KD at diagnosis (0.49 ± 0.01) and 2 days after IVIG treatment (0.48 ± 0.01) were higher than those in the control group (0.45 ± 0.01,P = 0.002,P = 0.033, respectively). No signifi cant diff erences were found in the LV dysfunction between the patients with complete and incomplete KD. Septal TDI-MPIs in patients with KD with CAL at diagnosis (0.52 ± 0.02) were higher than those in patients with KD without CAL (0.47 ± 0.01,P = 0.019). Conclusions Transient LV dysfunction occurred in patients with complete and incomplete KD in the acute stage. In patients with KD with CAL at diagnosis, the LV dysfunction was more prominent. The PD-MPI and TDI-MPI are useful parameters for assessing LV function in patients with KD.

关键词： Kawasaki disease Myocardial function Myocardial performance index Tissue Doppler imaging

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Frequency of Ventilator-associated pneumonia With 7-day versus 14-day ventilator circuit changes

Frequency of Ventilator-associated pneumonia With 7-day vers...

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中国医院协会第十七届全国医院感染管理学术年会暨第九届东...

作者： Jeong Sil choi Jeong hwa Yeon Deptartment of Nursing Sangji University Infection control officeKorea Deptartment of Nursing Sangji University Ilsan hospitalKorea

＜正＞Background and Purpose Recent guidelines concerning prevention of ventilator-associated pneumonia recommend that ventilator circuits should not be changed routinely,but in practice circuit changes at regular intervals ***,the purpose of this study is to determine whether a practice of not routinely changing ventilator circuits in patients who require prolonged mechanical ventilation is associated with an ventilator-associated pneumonia（VAP）.

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Food intolerance and skin prick test in treated and untreated irritable bowel syndrome

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World Journal of Gastroenterology 2006年第15期12卷 2382-2387页

作者： Dae-Won Jun Oh-Young Lee Ho-Joo Yoon Seok-hwa Lee Hang-Lak Lee Ho-Soon choi Byung-Chul Yoon Min-Ho Lee Dong-Hoo Lee Sang-Hoen Cho Department of Internal Medicine College of Medicine Hanyang UniversitySeoulKorea Department of Food and Nutrition College of Human Ecology Hanyang UniversitySeoulKorea Department of Internal Medicine College of Medicine Seoul National UniversitySeoulSouth Korea

AIM： To correlate the clinical features of treated and untreated patients with irritable bowel syndrome （IBS） to the results of skin prick test （SPT） for food and inhalant allergens. METHODS： We recruited 105 subjects to form three different target groups： treated group （n=44） undergoing treatment for IBS, untreated group （n =31） meeting the Rome Ⅱ criteria without treatment for IBS, control group （n = 30） with no IBS symptoms. RESULTS： SPT results were different among the three groups in which SPT was positive in 17 （38.6%） treated patients, in 5 （16.1%） untreated patients and in 1 （3.3%） control （P〈0.01）. The number of positive SPTs was greater in the IBS group than in the control group （P〈 0.001）. The number of positive food SPTs was higher in the treated IBS group than in the untreated IBS group （P= 0.03）. CONCLUSION： Positive food SPT is higher in IBS patients than in controls.

关键词： Irritable bowel syndrome Skin prick test Food allergy

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A Malicious and Malfunctioning Node Detection Scheme for Wireless Sensor Networks

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Wireless Sensor Network 2012年第3期4卷 84-90页

作者： Seo Hyun Oh Chan O. Hong Yoon hwa choi Department of Computer Engineering Hongik University Seoul Korea

Wireless sensor networks are often used to monitor physical and environmental conditions in various regions where human access is limited. Due to limited resources and deployment in hostile environment, they are vulnerable to faults and malicious attacks. The sensor nodes affected or compromised can send erroneous data or misleading reports to base station. Hence identifying malicious and faulty nodes in an accurate and timely manner is important to provide reliable functioning of the networks. In this paper, we present a malicious and malfunctioning node detection scheme using dual-weighted trust evaluation in a hierarchical sensor network. Malicious nodes are effectively detected in the presence of natural faults and noise without sacrificing fault-free nodes. Simulation results show that the proposed scheme outperforms some existing schemes in terms of mis-detection rate and event detection accuracy, while maintaining comparable performance in malicious node detection rate and false alarm rate.

关键词： Wireless Sensor Networks Fault Detection Malicious Node Detection

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A Decade-old Change in the Screening Rate for Hepatocellular Carcinoma Among a Hepatitis B Virus-infected Population in Korea

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Chinese Medical Journal 2016年第1期129卷 15-21页

作者： Hee Yeon kim Chang Wook kim Jong Young choi Chung-hwa Park Chang Don Lee HyeonWoo Yim Department of Internal Medicine Division of Hepatology College of Medicine The Catholic University of Korea Seoul 06591 Republic of Korea Department of Internal Medicine Division of Hepatobiliary International St. Mary's Hospital Incheon 22711 Republic of Korea Department of Preventive Medicine College of Medicine The Catholic University of Korea Seoul 06591 Republic of Korea

Background： Evaluating a change in the screening rate for hepatocellular carcinoma （HCC） is critical for understanding screening implementation, and whether targeted population groups are receiving proper screening. This study examined recent nationwide changes in HCC screening use among hepatitis B virus （HBV）-infected populations after the introduction of the Korean National Cancer Screening Program and predictors of screening adherence. Methods： We analyzed 165 and 276 participants 〉40 years of age who were hepatitis B surface antigen-positive fiom 2001 （14,936 participants） to 2010-2011 （9159 participants） Korea National Health and Nutrition Examination Surveys, respectively. Demographic data, socioeconomic factors, and HCC screening use were collected by means of self-reported questionnaires. Results： The rate of HCC screening within the previous 2 years increased significantly from 17.5% in 2001 to 40.3% in 2010- 20I 1 （P〈 0.0001 ）. The rate of HCC screening use increased from 2001 to 2010-2011 in all study populations. Subjects who had a higher income staius and were aware of their infection were more likely to have undergone recent HCC screening. Conclusions： This study showed a substantial increase in HCC screening in high-risk HBV-infected subjects from 2001 to 2010-2011. However, the HCC screening participation rate remained suboptimal despite the introduction of the nationwide screening program. Efforts should be made to identiry high-risk individuals and increase attendance at HCC screening events among high-risk groups.

关键词： Carcinoma: Health Surveys: Hepatitis B: Hepatocellular Surveillance

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Analgesic efficacy of median nerve stimulation in mice with chemotherapy-induced peripheral neuropathy via modulation of brain-derived neurotrophic factor expression

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中医杂志:英文版 2023年第4期43卷 686-694页

作者： Dong-Wook Kang Jae-Gyun choi Hee Ju Song Jaehyuk kim Miae Lee Taehee kim Suk-Yun Kang Yeonhee Ryu hwa Seung Yoo Jin Sun Lee Jin Bong Park Sang Do Lee Hyun-Woo kim Department of Physiology and Medical Science College of Medicine and Brain Research InstituteChungnam National UniversityDaejeon 35015Republic of Korea KM Fundamental Research Division Korea Institute of Oriental Medicine Daejeon 34054Republic of Korea East-West Cancer Center Dunsan Korean Medicine Hospital of Daejeon UniversityDaejeon 35234Republic of Korea Department of Surgery Chungnam National University HospitalDaejeon 35015Republic of Korea Laboratory of Veterinary Pharmacology College of Veterinary Medicine and Research Institute for Veterinary ScienceSeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea

OBJECTIVE:Chemotherapeutic agents such as docetaxel(DTX)can trigger chemotherapy-induced peripheral neuropathy(CIPN),which is characterized by unbearable *** study was designed to investigate the analgesic effect and related neuronal mechanism of low-frequency median nerve stimulation(LFMNS)on DTX-induced tactile hypersensitivity in ***:To produce CIPN,DTX was administered intraperitoneally 4 times,once every 2 d,to male ICR *** was performed on the wrist area,and the pain response was measured using von Frey filaments on both hind *** blot and immunofluorescence staining were performed using dorsal root ganglion and spinal cord samples to measure the expression of brainderived neurotrophic factor(BDNF).RESULTS:Repeated LFMNS significantly attenuated the DTX-induced abnormal sensory response and suppressed the enhanced expression of BDNF in the DRG neurons and spinal dorsal ***:LFMNS might be an effective nonpharmaceutical option for treating patients suffering from CIPN via regulating the expression of peripheral and central BDNF.

关键词： analgesia brain-derived neurotrophic factor chemotherapy-induced peripheral neuropathy docetaxel nerve stimulation

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Gene-diet interactions in gastric cancer risk: A systematic review

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World Journal of Gastroenterology 2014年第28期20卷 9600-9610页

作者： Jeongseon kim Young Ae Cho Wook Jin choi Seung hwa Jeong Molecular Epidemiology Branch Division of Cancer Epidemiology and PreventionResearch InstituteNational Cancer Center

AIM:To conduct a systematic review of the published epidemiological studies investigating the association of the interactions between gene variants and dietary intake with gastric cancer ***:A literature search was conducted in PubMed,EMBASE,and MEDLINE for articles published between January 2000 and July 2013,and 38 studies were *** studies included various dietary factors(e.g.,fruits and vegetables,soybean products,salt,meat,and alcohol)and genetic variants that are involved in various metabolic ***:Studies suggest that individuals who carry high-risk genetic variants and demonstrate particular dietary habits may have an increased risk of gastric cancer compared with those who do not carry high-risk genetic *** dietary patterns and variations in the frequency of genetic variants may explain the higher incidence of gastric cancer in a particular ***,most previous studies have limitations,such as a small sample size and a retrospective casecontrol *** addition,past studies have been unable to elucidate the specific mechanism in gene-diet interaction associated with gastric ***:Additional large prospective epidemiological and experimental studies are required to identify the gene-diet metabolic pathways related to gastric cancer susceptibility.

关键词： Gastric cancer Gene Diet Interaction

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Toxicological study of the hepatotherapeutic herbal formula,Chunggan extract,in beagle dogs

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World Journal of Gastroenterology 2006年第46期12卷 7497-7502页

作者： Woo-Jin choi Jang-Woo Shin Jin-Young Son Dong-Seok Seo Hark-Soo Park Seung-Hyun Han Ha-lung Sung Jung-Hyo Cho Chong-Kwan Cho hwa-Seung Yoo Yeon-Weol Lee Chang-Gue Son East-West Cancer Center Dunsan Oriental Hospital of Oriental medical Collage of Daejeon University 1136Dunsan-dong Seo-gu Daejeon 302-122 South Korea Safety Assess-ment Center Korea Testing and Research Institute for Chemical Industry 7-6 Gomak-ri Wolgot-myeon Gimpo-si Kyonggi-doKorea Department of Oromaxillofacial Infection & Immunity and Dental Research Institute School of DentistrySeoul National University 28 Yongon-Dong Chongno-Gu Seoul110-749 South Korea

AIM: To evaluate the pharmaceutical safety of a Chinese herbal formula, Chunggan extract (CGX), traditionally prescribed as a hepatotherapeutic drug via systemic acute and subacute toxicological study. METHODS: Twenty male dogs and 20 female dogs were fed doses 50 times and 4 times greater than the clinically-recommended drug dosages in an acute and a subacute toxicological study, respectively. Adverse effects were examined by comparing the differences between normal and drug-administered groups using clinical signs, necropsies, histopathologic findings, haematology, urinalysis, and biochemical analysis. RESULTS: In the acute study no change in the body weight, diarrhoea, apetite, mortality rate and histopa- thology of major organs was observed in male or female dogs with a single administration of CGX at 5 g/kg. No drug-induced abnormalities at analysis of histopathology, haematology, urinalysis, and biochemistry were found with any dose of this drug. CONCLUSION: CGX is supposed to be very safe when used in a clinical application with a wide therapeutic index.

关键词： Hepatotherapeutics Herbal remedy Chung-gan extract Safety Toxicological study

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