자기 베어링 안정성에 대한 변위 센서 시간 지연의 영향

김성학(JIN SHENGHE),안형준(Hyeong-Joon Ahn) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.7

Trophic Effect of Bee Pollen on Small Intestine in Broiler Chickens

Heng Wang,Jue Wang,Shenghe Li,Qifa Wang,Baozhong Xin 한국식품영양과학회 2007 Journal of medicinal food Vol.10 No.2

In this study, the effects of bee pollen on the development of digestive organs were evaluated in broiler chick-ens. A total of 144 1-day-old AA broiler chickens were randomly and equally divided into two groups, assigned as the con-trol group and the pollen group, respectively. The control group was fed with a basic diet, while the pollen group was fedwith a basic diet supplemented with 1.5% bee pollen over a period of 6 weeks. At the end of each week, the digestive organswere obtained for comparison from 12 broilers randomly selected from each group. The results demonstrated that comparedto the control group, the small intestine villi from the duodenum, jejunum, and ileum were longer and thicker in the pollengroup. This difference was more significant during early development, especially through the first 2 weeks. Bee pollen in-creased the length of the villi by 37.1% and 29.4% in the duodenum, 28.1% and 33.7% in the jejunum, and 18.6% and 16.2%in the ileum in week 1 and 2, respectively. Furthermore, the small intestinal glands were developed at a higher density in thepollen group, and the depth of the glands was significantly increased by bee pollen in the first 2 weeks. These findings sug-gest that bee pollen could promote the early development of the digestive system and therefore is a potentially beneficial foodsupplement for certain conditions, such as short bowel syndrome.

Three-Phase Coil Configurations for the Radial Suspension of a Bearingless Slice Motor

Hyeong-Joon Ahn,Ngoc Vu Vo,Shenghe Jin 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.1

Demand for energy-saving, high-efficiency motors has been growing due to the accelerating spread of electric cars, increasing focus on energy conservation and environmental protection. One of the main components of an electric motor system, the bearing is not only a source of frictional losses but also typically the first component to fail in an electric motor system. Therefore, non-contact supporting motors have been developed to overcome the shortcomings of mechanical bearings. Although the torque windings for electric motors were well developed in the motor industry, there are only few studies on the suspension coil of the bearingless motor systems. This paper presents a generalized three-phase coil configuration for the radial suspension of a bearingless slice motor. First, the bearingless motor and two windings are introduced. Then, the design problem of a bearingless slice motor's suspension coil for pure sinusoidal magnetomotive force is formulated as a well-known linear algebra problem or Ax = b. Then, the minimal realization of three-phase suspension coil configuration for the bearingless motors with various slots is determined by solving Ax = b. In addition, FE analysis is performed to verify the three-phase suspension coil configuration for bearingless motor with various slot numbers. The normalized suspension force, the normalized resistance, and total harmonic distortion of the suspension winding for various slot numbers are compared.

Identification of differentially expressed genes in longissimus dorsi muscle between Wei and Yorkshire pigs using RNA sequencing

Jingen Xu,Chonglong Wang,Erhui Jin,Youfang Gu,Shenghe Li,Qinggang Li 한국유전학회 2018 Genes & Genomics Vol.40 No.4

Intramuscular fat (IMF) content is an important trait closely related to meat quality, which is highly variable among pig breeds from diverse genetic backgrounds. High-throughput sequencing has become a powerful technique for analyzing the whole transcription profiles of organisms. In order to elucidate the molecular mechanism underlying porcine meat quality, we adopted RNA sequencing to detect transcriptome in the longissimus dorsi muscle of Wei pigs (a Chinese indigenous breed) and Yorkshire pigs (a Western lean-type breed) with different IMF content. For the Wei and Yorkshire pig libraries, over 57 and 64 million clean reads were generated by transcriptome sequencing, respectively. A total of 717 differentially expressed genes (DEGs) were identified in our study (false discovery rate < 0.05 and fold change > 2), with 323 up-regulated and 394 down-regulated genes in Wei pigs compared with Yorkshire pigs. Gene Ontology analysis showed that DEGs significantly related to skeletal muscle cell differentiation, phospholipid catabolic process, and extracellular matrix structural constituent. Pathway analysis revealed that DEGs were involved in fatty acid metabolism, steroid biosynthesis, glycerophospholipid metabolism, and protein digestion and absorption. Quantitative real time PCR confirmed the differential expression of 11 selected DEGs in both pig breeds. The results provide useful information to investigate the transcriptional profiling in skeletal muscle of different pig breeds with divergent phenotypes, and several DEGs can be taken as functional candidate genes related to lipid metabolism (ACSL1, FABP3, UCP3 and PDK4) and skeletal muscle development (ASB2, MSTN, ANKRD1 and ANKRD2).

Seismic Performance of Kiewitt-Sunflower Single Layer Spherical Reticulated Shells

Sheng He,Siliu Yu,Weijing Yun,Stéphane P. A. Bordas,Peng Yu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.5

In this paper, seismic behavior of Kiewitt-Sunflower single layer spherical reticulated shells is examined within the time history method, based on our proposed damage constitutive model for thin-walled circular steel tubes. According to a large number of numerical examples, the failure mode of this kind of single layer spherical reticulated shell in the case of earthquake is figured out. In addition, the effect of the damage accumulation, rise-span ratio, initial geometric imperfection, types of seismic wave and amplitude modulation ratio on the dynamic response of the shell structure is explored. Finally, a structural damage factor is proposed and it has a good match with the numerical results, which is productive to assess the damage and failure behavior of such structures suffering the earthquake and post-earthquake.

Investigation on Simulation Methods of Initial Geometric Imperfection Distribution in Elasto-plastic Stability Analysis of Single-layer Reticulated Shells

Sheng He,Zhengrong Jiang,Jian Cai 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4

Based on the theory of probability and mathematical statistics and on the results of nearly 2000 cases of elasto-plastic stabilityanalysis for single-layer reticulated shells, a new simulation method of initial geometric imperfection distribution, N-ordereigenmode imperfection method, is developed. The elasto-plastic stability analyses of four types of commonly used single-layerreticulated domes were conducted with the random imperfection mode method, the eigenmode imperfection method and the N-ordereigenmode imperfection method, respectively, by means of ANSYS. The results show that, though the random imperfection modemethod can simulate the initial geometric imperfection distribution realistically, the calculation cost of this method is too large topopularize in design practice. Adopting the first order eigenmode to simulate the distribution of initial geometric imperfection mayfail to derive the most unfavorable buckling load. The reliability of buckling load obtained from the eigenmode imperfection methodcannot be guaranteed effectively. The N-order eigenmode imperfection method can evaluate the influence of initial geometricimperfection on structural stability reasonably, and capture the buckling load satisfying the requirement of the ‘3σ’ principle with lesscalculation. This method is a convenient and efficient way for designers to estimate stability performance of single-layer reticulatedshells accurately and safely.