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Research on the Fluctuation of Pork Prices in China under Major Sudden Public Safety Events
Shi-Yong Piao(박세영),Yuan-Ze Shi(사원택),Li-Ling Jin(김려령),Jong-In Lee(이종인) 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.5
2020년 초부터 2022년 말까지의 주요 급발적 공중보건 사건(COVID-19 등)이 중국의 농산물 시장, 특히 돼지고기 가격에 큰 변동성을 가져왔다. 돼지고기 가격의 파동은 국가의 규제와 국민의 식생활에 큰 영향을 주었다. 본 연구는 2020~2022년 중국 돼지고기 가격, 코로나 확진자 등의 데이터를 바탕으로 VECM 오차 보정 모델을 사용하여 주요급발적 공중보건 사건시기 돼지고기 가격에 영향을 주는 요인을 분석하였다. 결과적으로, 주요 급발적 공중보건 사건 초기에는 COVID-19 확진자와 돼지고기 가격이 강한 정의 상관관계를 보였으나, 시간이 흐름에 따라 약화되었다. 연구결과 바탕으로, 돼지고기 가격의 안정화를 위한 조치와 이에 대한 제안을 제시하였다. From early 2020 to the end of 2022, major sudden public health events, such as COVID-19, significantly influenced the agricultural market in China, with pork prices experiencing substantial volatility. This turbulence in pork prices had profound implications for national regulations and the dietary habits of the populace. Based on data concerning pork prices and COVID-19 infection rates in China from 2020 to 2022, this study employed the VECM error correction model to analyze factors impacting pork prices during these major public health events. Results revealed that in the initial stages of the significant public health events, there was a strong positive correlation between COVID-19 confirmed cases and pork prices, which weakened over time. Drawing on these findings, measures and recommendations were put forth to stabilize pork prices.
Shi, Ji-Ying,Li, Ya-Jing,Xue, Fei,Ling, Le-Tao,Liu, Wen-An,Yuan, Da-Ling,Yang, Ting The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
Active distribution system (ADS) considering distributed generation (DG) and electric vehicle (EV) is an effective way to cut carbon emission and improve system benefits. ADS is an evolving, complex and uncertain system, thus comprehensive model and effective optimization algorithms are needed. Battery swapping station (BSS) for EV service is an essential type of flexible load (FL). This paper establishes ADS planning model considering BSS firstly for the minimization of total cost including feeder investment, operation and maintenance, net loss and carbon tax. Meanwhile, immune binary firefly algorithm (IBFA) is proposed to optimize ADS planning. Firefly algorithm (FA) is a novel intelligent algorithm with simple structure and good convergence. By involving biological immune system into FA, IBFA adjusts antibody population scale to increase diversity and global search capability. To validate proposed algorithm, IBFA is compared with particle swarm optimization (PSO) algorithm on IEEE 39-bus system. The results prove that IBFA performs better than PSO in global search and convergence in ADS planning.
Ling-Na Shi,Xue-Zhong Li,Lan-Tong Cui,Peng-Fei Wang,Ying Xie,Ting-Feng Yi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
Developing well-behaved electrode materials is crucial for manufacturing high-performance batteries,SCs and electrocatalysis, and it is also one of the main driving forces for the development of EES devices. In consideration of the high robustness and electrical conductivity during the electrochemical reactionprocess, VN-based materials exhibit good performance as electrode materials (or catalytic materials)for batteries, supercapacitors, and excellent catalytic activity for electrocatalysts. Especially, the VNbasedmaterials decorated into other active compounds with various morphologies elaborately presentexcellent performances due to the abundant active sites and fully synergistic effect. This review presentsthe structure-performance relation by designing different-dimensional nanostructures and various applicationsof VN-based materials in electrochemical energy storage (EES) applications. Finally, the perspectiveson future challenges and progress have been discussed. This review can offer a specificunderstanding for the optimization strategies of VN-based materials, thus booming the rapid developmentand practical applications for EES devices in the future.
Meng Shi,Zhaoyu Liu,Hong Liang Wang,Chuanxin Shi,Ling Liu,Junjun Wang,Defa Li,Shuai Zhang 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.3
Objective: This experiment was conducted to determine the chemical composition, digestible energy (DE) and metabolizable energy (ME) contents of corn germ meals (CGM) and to develop equations to predict the corresponding energy contents based on the chemical characteristics of individual CGM. Methods: Sixty-six barrows (initial body weight = 51.3±4.6 kg) were allotted to 11 diets including a basal diet and 10 CGM test diets in a completely randomized design. In the test diets, CGM was included in replacement of 30% of the energy-providing ingredients in the basal diet, resulting in a final inclusion rate of 29.1%. Each diet was fed to 6 barrows housed in individual metabolism crates for a 7-d acclimation period followed by a 5-d total but separate collection of feces and urine. Results: Considerable variation was observed in acid-hydrolyzed ether extract, ether extract, ash, calcium (Ca) and total phosphorus contents among the CGM samples. On dry matter (DM) basis, the DE and ME contents of the CGM ranged from 10.22 to 15.83 MJ/kg and from 9.94 to 15.43 MJ/kg, respectively. The acid detergent fiber (ADF) contents were negatively correlated with the DE and ME contents of CGM samples. The best-fit prediction equations for the DE and ME values (MJ/kg DM) of the 10 CGM were: DE = 26.85–0.28 insoluble dietary fiber (%)–17.79 Ca (%); ME = 21.05–0.43 ADF (%)–11.40 Ca (%). Conclusion: The chemical compositions of CGM vary depending on sources, particularly in ether extract and Ca. The DE and ME values of CGM can be predicted based on their chemical composition in growing pigs.
Yi-Ling Du,Shi-Fei Chen,Liang-Ying Cheng,Xue-Ling Shen,Yuan Tian,Yong-Quan Li 한국미생물학회 2009 The journal of microbiology Vol.47 No.4
A novel Streptomyces strain, L10, which is capable of producing natamycin, was isolated from a soil sample collected from Zhejiang province, China. On the basis of phylogenetic analysis of rpoB gene and 16S rDNA sequences, as well as phenotypic comparison, strain L10 (CGMCC 2644) is proposed to be a previously uncharacterized strain of S. chattanoogensis. By screening a cosmid library of strain L10 and primer walking, a partial sequence of scnRI and the entire sequence of scnRII were obtained, which are orthologues to the pathway-specific positive regulator genes of natamycin biosynthesis in S. natalensis. The engineered S. chattanoogensis D1, generated by inserting an additional copy of scnRII into the chromosome of strain L10, increased its natamycin production by 3.3 fold in YSG medium and 4.6 fold in YEME medium without sucrose.
Malmquist모형을 이용한 중국 랴오닝성 농업생산효율성 분석
박세영(Shi-Yong Piao),김려령(Li-Ling Jin),사원택(Yuan-Ze Shi),이종인(Jong-In Lee) 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.5
중국 일부 지역의 농업생산은 여전히 소농경제의 영향을 받고 있으며 소농경제의 본질에서 벗어나지 못했기 때문에 농업 생산효율이 낮은 편이다. 농업생산 효율의 향상은 농업 발전에 아주 중요한 역할을 한다. 농업생산 효율의 수준은 지역 농업의 발전 수준을 직접 반영하므로 농업생산 효율의 향상은 지속 가능한 농업 발전을 실현하는 관건이다. 랴오닝성은 중국의 주요 식량 생산기지이며, 농업 발전에서 큰 잠재력을 가지고 있다. 본 연구에서는 중국 랴오닝성의 농업생산 효율성에 대하여 분석하였다. 이를 위하여 2011년부터 2020년까지의 중국통계연감의 데이터를 이용하여, Malmquist 모형을 통해 랴오닝성 14개 도시의 농업 생산성 변화를 분석하여 농업생산 효율성을 평가하였다. 연구 결과 10년 간 MPI는 전반적으로 비교적 낮은 수준에 머물러 있으며, 평균 기술 효율성 지수와 평균기술변화지수가 역 발전추세가 있고 규모 효율과 기술효율이 비교적 낮다. 그리고 농업 생산효율의 연간 증가의 주요 원인은 기술발전임을 확인하였다. 랴오닝성은 농업 기술 투입을 증대하고 정부의 지원을 강화하며 농업생산에 대한 적극성을 높여야 한다. 연구결과를 바탕으로, 랴오닝성 농업생산 효율성의 향상을 위한 조치와 이에 대한 제안을 제시하였다. Agricultural production in some parts of China is still affected by the small farmer economy, and agricultural production efficiency is low because it remains rooted in the essence of the small farmer economy. Improved agricultural production efficiency plays a central role in agricultural development. Agricultural production efficiency levels directly reflect the level of development of local agriculture, and thus, improvements in agricultural production efficiency are key to realizing sustainable agricultural development. Liaoning is a major food production base in China and has great potential for agricultural development. In this study, we analyze the efficiency of agricultural production in Liaoning Province. To this end, agricultural productivity changes in 14 cities in Liaoning Province were evaluated using the Malmquist model and data from the Chinese Statistical Yearbook from 2011 to 2020. The results showed that overall MPI has remained at a relatively low level for 10 years. Average technology efficiency and change indices revealed a reverse development trend and relatively low scale and technology efficiencies. In addition, the study confirms that technological development was the leading cause of an annual increase in agricultural production efficiency. Liaoning should increase the input of agricultural technology, strengthen government support, and increase its active involvement in agricultural production. Measures and suggestions for improving agricultural production efficiency in Liaoning Province were presented based on the results obtained.