Yanbian Prefecture Research Articles

The lead time and geographical variations of Baidu Search Index in the early warning of COVID-19

Internet search data was a useful tool in the pre-warning of COVID-19. However, the lead time and indicators may change over time and space with the new variants appear and massive nucleic acid testing. Since Omicron appeared in late 2021, we collected the daily number of cases and Baidu Search Index (BSI) of seven search terms from 1 January to 30 April, 2022 in 12 provinces/prefectures to explore the variation in China. Two search peaks of “COVID-19 epidemic”, “Novel Coronavirus” and “COVID-19” can be observed. One in January, which showed 3 days lead time in Henan and Tianjin. Another on early March, which occurred 0–28 days ahead of the local epidemic but the lead time had spatial variation. It was 4 weeks in Shanghai, 2 weeks in Henan and 5–8 days in Jilin Province, Jilin and Changchun Prefecture. But it was only 1–3 days in Tianjin, Quanzhou Prefecture, Fujian Province and 0 day in Shenzhen, Shandong Province, Qingdao and Yanbian Prefecture. The BSI was high correlated (rs:0.70–0.93) to the number of cases with consistent epidemiological change trend. The lead time of BSI had spatial and temporal variation and was close related to the strength of nucleic acid testing. The case detection ability should be strengthened when perceiving BSI increase.

A Novel Heterogeneous Ensemble Framework Based on Machine Learning Models for Shallow Landslide Susceptibility Mapping

Landslides are devastating natural disasters that seriously threaten human life and property. Landslide susceptibility mapping (LSM) plays a key role in landslide hazard management. Machine learning (ML) models are widely used in LSM but suffer from limitations such as overfitting and unreliable accuracy. To improve the classification performance of a single machine learning (ML) model, this study selects logistic regression (LR), support vector machine (SVM), random forest (RF), and gradient boosting decision tree (GBDT), and proposes a novel heterogeneous ensemble framework based on Bayesian optimization (BO), namely, stratified weighted averaging (SWA), to test its applicability in a typical landslide area in Yanbian Prefecture, China. Firstly, a dataset consisting of 1531 historical landslides was collected from field investigations and historical records, and a spatial database containing 16 predisposing factors was established. The dataset was divided into a training set and a test set in a ratio of 7:3. The results showed that SWA effectively improved the Accuracy, AUC, and robustness of the model compared to a single ML model. The SWA achieved the best classification results (Accuracy = 91.39% and AUC = 0.967). To verify the generalization ability of SWA, we selected published landslide datasets from Yanshan country and Yongxin country in China for testing. SWA also performed well, with an AUC of 0.871 and 0.860, respectively. As indicated by shapely values (SVs), Normalized Difference Vegetation Index (NDVI) is the factor that has the greatest impact on landslide occurrence. The landslide susceptibility maps obtained from this study will provide an effective reference program for land use planning and disaster prevention and mitigation projects in Yanbian Prefecture, China.

Dynamic Changes in Soil Phosphorus Accumulation and Bioavailability in Phosphorus-Contaminated Protected Fields.

Soil phosphorus accumulation resulting in a high risk of phosphorus pollution is due to high multiple vegetable cropping indexes and excessive fertilizer input in protected fields. Therefore, this study explored the bioavailability of soil-accumulated phosphorus to improve fertilization and reduce the risk of soil phosphorus contamination in protected fields. A field trial was performed in Yanbian Prefecture, China to study the phosphorus bioavailability after continuous spinach planting without phosphate fertilizer applications. Results indicated that with increasing numbers of planting stubbles, soil inorganic phosphorus and occluded phosphorus changed little, while water-soluble and loose phosphorus, aluminum-phosphate, iron-phosphate, and calcium-phosphorus decreased first and then increased. Soil available phosphorus declined linearly. For planting spinach in protected fields, the threshold of soil phosphorus deficiency is 200 mg kg−1. A soil phosphorus supply potential model was established between x (the soil available phosphorus) and y (the numbers of planting stubbles): y = 6.759 + 0.027x, R = 0.99, which can be used to predict how planting stubbles are needed to raise the soil available phosphorus above the critical value of phosphorus deficiency for spinach. These results will provide the theoretical guidance for rational phosphorus fertilizer applications and control agricultural, non-point pollution sources in protected fields.

Molecular epidemiology of canine parvovirus 2 from 2014, 2019, and 2021 shows CPV2 circulating and CPV2c increasing in Yanbian, China.

Canine parvovirus 2 (CPV2) causes one of the most serious canine viral infections, with high mortality in young dogs. In 2014, 2019, and 2021, we determined genetic sequences of CPV2 strains obtained from 39 fecal samples collected from the Yanbian Korean Autonomous Prefecture in the Jilin Province of China. Sequence alignments were performed using the major capsid protein (VP2) gene; protein sequences of these samples had high nucleotide (>97.4%) and amino acid (>95.6%) identity. All of the amino acid sequences contained Ser297Ala and Tyr324Ile mutations. Our survey indicated a high prevalence of CPV2 variants in Yanbian Prefecture, with the new CPV2a variant (26 of 39; 67%) being the most frequent. CPV2c, identified in 9 of 39 (23%) samples, had not been detected in this region previously, indicating the potential risk of CPV2 mutation. The sequences of our 39 CPV2 samples were more highly homologous to the published Chinese strains than to the CPV2 variant strains found in other countries.

Data science based landscape ecology for traditional village landscape protection

With the revitalisation of rural areas and the advancement of new rural construction, at present, the traditional village protection has received more attention. The optimisation of village layout is an essential issue in the protection of traditional villages, which is not only an objective demand for rural development, but also an important way to protect and avoid damage to the ecological and landscape patterns of the original villages. With the increase in the development of traditional villages, the general scale and shape of traditional villages have found profound changes. The phenomenon of village landscape convergence and original landscape destruction occurs from time to time. In the new situation, the traditional village protection faces new opportunities and challenges. By using landscape ecology theory to guide the preservation of traditional villages, the integrity, authenticity and continuity of traditional villages can be maintained. This article takes Yueqing Town, Bailong Village and Shixian Town, Shuinan Village in Yanbian Prefecture, Jilin Province as the research objects, applying the landscape pattern index to quantitatively analyse its overall landscape. On this basis, the village landscape optimisation and preservation strategy is proposed, which has certain reference value for the preservation and reuse of traditional villages in Jilin Province.

Data science based landscape ecology for traditional village landscape protection

With the revitalisation of rural areas and the advancement of new rural construction, at present, the traditional village protection has received more attention. The optimisation of village layout is an essential issue in the protection of traditional villages, which is not only an objective demand for rural development, but also an important way to protect and avoid damage to the ecological and landscape patterns of the original villages. With the increase in the development of traditional villages, the general scale and shape of traditional villages have found profound changes. The phenomenon of village landscape convergence and original landscape destruction occurs from time to time. In the new situation, the traditional village protection faces new opportunities and challenges. By using landscape ecology theory to guide the preservation of traditional villages, the integrity, authenticity and continuity of traditional villages can be maintained. This article takes Yueqing Town, Bailong Village and Shixian Town, Shuinan Village in Yanbian Prefecture, Jilin Province as the research objects, applying the landscape pattern index to quantitatively analyse its overall landscape. On this basis, the village landscape optimisation and preservation strategy is proposed, which has certain reference value for the preservation and reuse of traditional villages in Jilin Province.

Research on training Strategy of information Technology Application Ability of Normal university students

Background/Objectives: Under the background of educational informatization, the realization of education modernization and information education is the inevitable trend of future education development. As the backbone of the future teacher team, the level of information technology application ability of normal university students is the key to the modernization of future education. Therefore, the ministry of education proposed to strengthen the cultivation of information literacy of normal university students. Methods/Statistical analysis: As the cradle of basic education teachers in yanbian prefecture, yanbian university should strengthen the cultivation of information technology application ability of normal university students and study the current situation of the cultivation. In this paper, two questionnaires were conducted before and after the training of normal university students in yanbian university. Findings: Through the comparison and analysis of the two data by SPSS software, it is found that there is no specific training for normal university students in the training of information technology application ability of normal university students in yanbian university. Teaching less theoretical knowledge; Students have fewer opportunities to practice the problem. Improvements/Applications: Finally, the author puts forward some strategies for the future cultivation of information technology application ability of normal university students in yanbian university. For the training of excellent information teachers to contribute.

Investigation and research on ticks carrying spotted fever group rickettsia in the border area of Tumen River Basin

Objective: To understand the situation and genotype distribution of spotted fever group rickettsia (SFGR) in the border area of Tumen River Basin in free ticks in Yanbian Korean Autonomous Prefecture (Yanbian Prefecture), Jilin Province. Methods: From April to September, 2017, ticks were collected using flagging method from Hunchun, Tumen, Helong and Longjing cities in the Tumen River basin of Yanbian Prefecture. Outer membrane protein A (ompA) was detected by Polymerase Chain Reaction (PCR), then, the species were identified by gene sequencing and analyzed systematically. The positive rate of pools and MIR(minimum infection rate per 100 ticks,MIR) of SFGR were calculated, and the difference of positive rate of pools among ticks with different characteristics was compared by Chi-square test. Results: A total of 3 079 ticks were collected and divided into 536 pools. The positive rate of pools of SFGR nucleic acid was 39.7% (213 pools). The MIR of SFGR was 6.9%.The positive rate of pools of SFGR in Dermacentor silvarum, Haemaphysalis concinna, Haemaphysalis japonica, Haemaphysalis longicornis and Ixodes persulcatus were 80.4% (41/51), 14.0% (25/179), 20.2% (18/89), 78.9% (101/128) and 25.9% (21/81), and the difference was statistically significant (P<0.001). There was statistical difference in the positive rate of pools of SFGR in developmental stages of ticks (P<0.001); the positive rate of pools of female adults, male adults, nymph and larvae were 36.4% (95/261), 34.2% (67/196), 56.3% (40/71) and 7/8, and the MIR was 7.9%, 7.7%, 4.9% and 3.5%. The five genotype was detected which was Candidatus Rickettsia longicornii, Rickettsia raoultii, Rickettsia heilongjiangensis, Candidatus Rickettsia tarasevichiae,Rickettsia monacensis and have 98%-100% homology with known gene sequences. Candidatus Rickettsia longicornii, Rickettsia raoultii, Rickettsia heilongjiangensis and Candidatus Rickettsia tarasevichiae showed close evolutionary relationship with known specie (have 98%-100% homology with known gene sequences); Rickettsia monacensis showed Far from evolutionary relationship with known species (have 98% homology with known gene sequences). Conclusion: SFGR infection of ticks is common in the border areas of the Tumen River Basin. There was high diversity in SFGR species and tick species in the areas surveyed.

Research on the Beautiful Rural Design of Koreans – Taking the rural planning of Jing Xin Town in Hunchun as an example

As the acceleration of China’s growth continues, both urban and rural areas of China have received comprehensive planning in its land management. China’s construction industry continues to bloom into a new era. With the unique historical and cultural background of the Korean people, China’s Yanbian prefecture has become its own individual region brought forth by Korean traditional culture. As a cross-border ethnic area, making rural planning and designs without losing the historical distinct cultural characteristics of the area has become a key issue that requires focused planning in the Northeast.

Risk Analysis of Debris Flow hazardsin Yanbian Prefecture Based on Information Quantity Method

Taking the Yanbian Prefecture as the study area, this paper selects 8 influencing factors: elevation, slope, slope direction, precipitation, river, lithology, fault and land use. Taking 163 debris flow points as sample data, information quantity method and GIS platform are introduced to calculate the information amount of each influence due to sub classification. The risk assessment and analysis of debris flow were carried out, and the risk assessment and analysis map of debris flow in Yanbian was drawn. The results show that the areas where the debris flow hazard is more dangerous are in good agreement with the historical debris flow, and the accuracy of the methods and factors used in this paper is verified.

Comparative Analysis of Agronomic Characters and Saponins Amount of Ginseng in Four Main Agricultural Areas in Yanbian Prefecture

The farmland ginseng cultivation in Yanbian Prefecture is the main direction in the future. This paper investigates and studies the two main cities and counties in Yanbian Prefecture. The results show that there is no significant difference in root weight and root diameter between the two-year-old farmland, the three-year-old rooting heavy Wang-qing experimental site is significantly higher than other experimental sites, and the three-year-rooting-rough-dunning experimental site is significantly higher than the other three experimental sites. Position. The correlation analysis of the two-year-old soil indicators with root traits and total saponin content showed that total saponin content only showed a significant positive correlation with total phosphorus content; available phosphorus showed a significant positive correlation with root weight and root diameter; root diameter had a significant positive correlation with electrical conductivity. The content of total saponins and total phosphorus showed a highly significant positive correlation, and a highly significant positive correlation with total nitrogen; root weight and pH showed a highly significant positive correlation; root diameter and available phosphorus showed a highly significant positive correlation, and nitrate nitrogen showed a significant positive correlation. The total saponins content of ginseng in two-year-old farmland showed a significant negative correlation with root weight and root diameter, while the total saponins content in three-year-old farmland showed a very significant negative correlation with root diameter, but no significant correlation with other traits.

Cold Wave Climate Characteristics and Risk Zoning in Jilin Province

Using the meteorological data of 50 stations in Jilin Province from 1961 to 2016, the demographic and economic data, and geographical information of all counties and cities aims to conduct the risk zoning of cold wave disasters in Jilin Province. The results show that, since 1961, the average number of cold wave occurrences per year in Jilin Province is 8.3 days, of which the highest number of occurrences occurred in February, followed by December and January, and the spring cold wave occurred mostly in March. From the map of cold-sea disaster risk zoning in Jilin Province, due to factors such as topography and land use distribution, the west and east of Jilin Province have a certain resilience to the disasters caused by cold waves, and the risk of disasters is low. The distribution of agricultural facilities and large areas of farmland in the central region are extremely sensitive to cold wave disasters and have a high risk of disasters. Areas with high risk of cold wave are mainly concentrated in Siping City, Changchun City, Liaoyuan City, Jilin City, northern Tonghua City and most of Baishan City. Areas with low cold wave risk are mainly concentrated in most of Baicheng City, most of Songyuan City and Yanbian Prefecture. And other places are moderately risky areas of cold waves.

Intestinal Parasite Infections among Inhabitants in Yanbian Prefecture, Jilin Province, China.

To investigate the prevalence of intestinal parasite infections in Yanbian Prefecture, Jilin Province, China, epidemiological surveys were conducted on a collaboration basis between the Korean Centers for Disease Control and Prevention and the Yanbian Center for Disease Control and Prevention. A total of 8,396 (males 3,737 and females 4,659) stool samples were collected from 8 localities and examined with the formalin-ether sedimentation technique, and additionally examined with the cellotape anal swab to detect Enterobius vermicularis eggs. The overall rate of intestinal parasites was 1.57%. The prevalence of Ascaris lumbricoides was the highest (0.80%), followed by Entamoeba spp. (0.23%), heterophyid flukes (0.15%), Clonorchis sinensis (0.08%), Enterobius vermicularis (0.07%), hookworms (0.06%), Trichostrongylus spp. (0.06%), Giardia lamblia (0.04%), Paragonimus spp. (0.02%), Diphyllobothrium spp. (0.02%), Trichuris trichiura (0.02%). The prevalence by sex was similar, 1.58% (n=59) in males and 1.57% (n=73) in females. By the present study, it is partly revealed that the prevalences of intestinal parasite infections are relatively low among the inhabitants of Yanbian Prefecture, Jilin Province, China.

Increasing Newly Diagnosed Rate and Changing Risk Factors of HCV in Yanbian Prefecture, a High Endemic Area in China

BackgroundThe newly diagnosed rate of HCV infection is increasing in China. However, the risk factors have not been fully identified. Here, a survey was performed in Yanbian Prefecture, a high-endemic area in China.MethodsWe identified newly diagnosed HCV infection in 2007–2011, using the local National Disease Supervision Information Management System from the Chinese Center for Disease Control and Prevention. We determined the risk factors using a case-control survey by questionnaire.ResultsYanbian Prefecture had a rapid increase in the yearly newly diagnosed rate of HCV infection from 32.6 to 72.1/100.000 from the year 2007 to 2011. People aged 50–64 years had a high HCV infection of 43.4%, but only 0.3% of cases were reported in those aged less than 20 years. Cosmetic treatment, family history, blood transfusion, and dental treatment were independent risk factors for HCV infection. Unexpectedly, cosmetic treatments [odd ratio (OR) = 5.15, 95% confidence interval (CI) = 2.31–11.48, P = 0.00] and family history (OR = 4.68, 95% CI = 2.67–8.75, P = 0.00) showed a higher risk than the conventional risk factors of blood transfusion (OR = 4.49, 95% CI = 1.95–10.37, P = 0.001) and dental treatment (OR = 2.98, 95% CI = 1.42–6.25, P = 0.00). To further analyze the intrafamilial transmission, we found that spouses of HCV patients had an increased risk for acquiring HCV (OR = 5.75, 95% CI: 1.94–17.07), without significant association between either HCV RNA viral load (P = 0.29) or genotype (P = 0.43).ConclusionsHCV infection was increased in Yanbian Prefecture. Cosmetic treatment was a higher risk factor than medical procedure. HCV infection had a clear family clustering phenomenon, especially between spouses.

Outflows of Chinese Koreans in Yanbian Prefecture

Most ethnic Koreans in China live in Yanbian Prefecture. Since 1996, the population of Yanbian Koreans has registered a negative growth, which is largely attributed to population outflow. According to the 2003 Sample Survey to Examine the Negative Population Growth of Yanbian Koreans, 37 percent of the households reported having members who sought work elsewhere. Logistic regression analysis shows that people with higher educational level and those engaged in agriculture had a higher probability of leaving. Men and those who completed secondary education were more likely to choose to go to South Korea while those who are married and are engaged in non-agricultural work were more likely to participate in intra- or inter-provincial search for employment in China.

Meningitis and a Febrile Vomiting illness Caused by Echovirus Type 4, Northern Territory, Australia

In July 2007, a cluster of meningitis cases caused by an echovirus 4 strain was detected in 1 indigenous community in the Top End of the Northern Territory of Australia. Illness was characterized by fever, vomiting, and headache. Over the next 4 months, additional cases of meningitis and the fever and vomiting syndrome emerged in other indigenous communities and subsequently in the major urban center of Darwin. We describe the epidemiology of 95 laboratory-confirmed meningitis cases and conclude that the epidemic fever and vomiting syndrome was caused by the same enterovirus. Nucleotide sequencing of the whole genome verified this enterovirus (AUS250G) as a strain of echovirus type 4. Viral protein 1 nucleotide sequencing demonstrated 96% homology with an echovirus 4 strain responsible for a large outbreak of meningitis in the Yanbian Prefecture of China in 1996.

The Korean Minority in China: A Model for Ethnic Education

The educational system in China's Yanbian Prefecture presents a relatively successful model for Korean ethnic education. Koreans in China have a much higher percentage of literacy and middle school and college graduation than the national average or any other minority nationality. Despite the integrationist impulses of the Chinese nationality policy during the Rectification Movement and the Cultural Revolution, the Korean minority has successfully sustained its ethnic identity. Central to the well-being of the Korean minority in China is its continuing achievement of the highest level of educational attainment. Within the moderate nationality policy currently enunciated by Beijing, the ethnically based education system of the Korean minority in Northeast China presents a program to be studied and emulated by other minority nationalities.