Solar TDOA/Doppler Difference Joint Observation Navigation for the Approach Phase of Mars Exploration

Pan Chao,Liu Jin,Kang Zhi-wei,Chen Xiao 한국항공우주학회 2020 International Journal of Aeronautical and Space Sc Vol.21 No.3

The celestial navigation using the difference between the direct and reflected solar light is emerging, as the difference can remove the conjoint bias caused by the instability and unpredictability of sunlight. These navigation methods include the solar Doppler difference and the solar TDOA (time difference of arrival). The solar TDOA measurement has a high positioning accuracy. However, the solar flare is unpredictable, which leads to the instability and randomness of the positioning performance in the approach phase. Fortunately, the solar Doppler difference navigation is stable. However, this navigation system is unobservable. To utilize their advantages and avoid their disadvantages, we combine them and propose the solar TDOA/Doppler difference joint observation. Due to its unobservability, we integrate it with the Mars angle navigation, and develop the solar light joint observation/Mars angle integrated navigation that is completely observable. The simulation results demonstrate the stability and robustness of the solar TDOA/Doppler difference joint observation navigation method. Compared with the celestial navigation using one solar difference observation such as the TDOA or the Doppler, the solar light joint observation/Mars angle integrated navigation can provide higher and more stable navigation accuracy.

The Interaction Design Principles about Page Layout of Over-the-counter Blockchain Transaction

Chao Ma,Younghwan Pan 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.3

Objective: To study the user"s visual behavioral habits of Over-the-counter Blockchain transaction webpages. Background: With the continuous development of the blockchain, a large number of users conduct off-exchange transactions on the exchange"s website, and the user experience is not very well. Method: Through the eye tracker experiment test and the software (BeGaze) analysis data, as well as the post-experimental questionnaire survey analysis and user interviews, the data is finally integrated and analyzed, and the user"s over-the-counter transaction in the blockchain exchange is obtained. Visual behavioral habits on the web. (1) The scope of the study included the user"s visual behavioral habits on the web side of the blockchain exchange. (2) Research methods include: quantitative research, qualitative research. Results: (1) Total eye data were analyzed by independent sample t test, as shown in total eye data. There were significant differences in the number of fixation points and average fixation time between the two pictures; (2) The average number of fixation points of adversary"s information area of both tests is obviously higher than the standard deviation, and the standard value of average fixation time is also significantly higher than the standard deviation; (3) The user"s demand for the adversary"s information area is very low; (4) Users think data is their most urgent need; (5) The heat map shape presents the shape of the waterfall; (6) The eye movement trajectory of most users shows that the user first scans in the vertical direction, then scans in the horizontal direction, and decreases from the top to the bottom. Conclusion: Five results were obtained through research and analysis, weakening adversary"s information, data emphasis, important rules for arrangement of different areas, the arrangement of sequence numbers, waterfall shape visual glance behavior. Application: The results of this study can be used for the layout guidance of the network side of the OTC transaction of the blockchain exchange, which can improve the service experience of the user on the exchange.

Laparoscopic hepatectomy for the treatment of Caroli’s disease: a case report

Chao-bo Chen,Wei-dong Hu,Wan-wen Zhao,Yan-yan Gu,Hong-wei Hou,Zheng Pan 대한외과학회 2018 Annals of Surgical Treatment and Research(ASRT) Vol.94 No.3

Caroli disease is a rare congenital disorder characterized by nonobstructive dilatation of intrahepatic ducts. In cases with symptomatic intrahepatic manifestations, treatment should correspond to the type with hepatic resection for localized disease and transplantation for diffuse forms. If possible, complete resection of the cysts can cure the symptoms and avoid the risk of malignancy. A 66-year-old woman presented to Wuxi Xishan People's Hospital with recurrent intermittent upper quadrant abdominal pain. Further examinations suggested the diagnosis of Caroli disease limited to the left hepatic lobe. She underwent laparoscopic hepatectomy. Pathological examination confirmed the diagnosis of Caroli disease, and no malignancy was found. There were no immediate complications and no long-term complications after one and one-half years of follow-up. Laparoscopic hepatectomy could be a feasible, safe treatment option for localized Caroli disease

Silencing downstream of receptor kinase gene (drk) impairs larval-pupal ecdysis in Leptinotarsa decemlineata (Say)

Pan Deng,Jun-Li Du,Li-Li Mu,Kai-Yun Fu,Wen-Chao Guo,Guo-Qing Li 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.1

In insects, an insulin-like peptide (ILP) triggers the formation of the insulin receptor (InR)/the insulin receptor substrate Chico complex. The complex then recruits downstream of receptor kinase (Drk) and phosphatidylinositol-3-kinase (PI3K) to initiate two signaling branches, i.e., Drk-mitogen-activated protein kinase (MAPK) and Pi3K-protein kinase B subdivisions. Previous findings reveal that RNA interference (RNAi) of LdILP2 or Ldchico, rather than Ldpi3k92E, impairs larval-pupal and pupal-adult molting in the Colorado potato beetle Leptinotarsa decemlineata. It is accordingly hypothesized that the Drk-MAPK branch regulates larval metamorphosis. In the present paper, we first found that silencing LdILP2, Ldchico or Ldpi3k92E did not decrease the expression level of Lddrk, indicating other receptor tyrosine kinases’ signaling except insulin pathway is not affected in the RNAi larvae. Moreover, two InRs and Torso were highly expressed in the final larval instars. Furthermore, RNAi of either Lddrk or Ldchico, or both of them equally affected larval-pupal and pupal-adult molts, and similarly repressed the expression of representative MAPK (Ldras and Ldraf), ecdysteroidogenesis (Ldphm and Ldsad), and 20E signaling (LdEcR, LdUSP, LdHR3 and LdE75) genes. 20E feeding by Lddrk RNAi larvae completely restored the reduced mRNA levels of LdEcR, LdHR3 and LdE75, but did not rescued the decreased Lddrk and LdUSP levels and the lowered pupation and emergence rates. Therefore, our findings suggest that the Drk-MAPK branch is involved in metamorphosis regulation in L. decemlineata.

The effects of different factors on obstacle strength of irradiation defects: An atomistic study

Lin Pan-dong,Nie Jun-feng,Lu Yu-peng,Xiao Gui-yong,Gu Guo-chao,Cui Wen-dong,He Lei 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.6

In this work we study the effects of different factors of dislocation loop on its obstacle strength when interacting with an edge dislocation. At first, the interaction model for dislocation and dislocation loop is established and the full and partial absorption mechanism is obtained. Then, the effect of temperature, size and burgers vector of dislocation loop are investigated. The relation between the obstacle strength and irradiation dose has been established, which bridges the irradiation source and microscale properties. Except that, the obstacle strength of C, Cr, Ni, Mn, Mo and P decorated dislocation loop is studied. Results show that the obstacle strength for dislocation loop decorated by alloy element decreases in the sequence of Cr, Ni, Mn, C, P and Mo, which could be used to help parameterize and validate crystal plasticity finite element model and therein integrated constitutive laws to enable accounting for irradiation-induced chemical segregation effects.

Microstructure and electrical properties of La_2O_3-doped Bi_0.5(Na_0.68K_0.22Li_0.1)_0.5TiO_3 lead-free piezoelectric ceramics

Hong Pan,Yuting Hou,Xiaolian Chao,Lingling Wei,Zupei Yang 한국물리학회 2011 Current Applied Physics Vol.11 No.3

La_2O_3-doped Bi_0.5(Na_0.68K_0.22Li_0.1)_0.5TiO_3 lead-free piezoelectric ceramics have been successfully prepared by conventional solid state method and the effects of La_2O_3 doping on microstructure and electrical properties of the ceramics were investigated. The X-ray diffraction patterns demonstrated all ceramics possessed pure perovskite structure with rhombohedral symmetry. The temperature dependence of dielectric constant and dielectric loss revealed two abnormal dielectric peaks of T_d and T_m,which implied that from room temperature to 500 ℃ all ceramics underwent two phase transitions which were from ferroelectric to anti-ferroelectric and anti-ferroelectric to paraelectric, respectively. It was also found that the transition temperature T_d decreased with the addition of La_2O_3. Diffuse phase transition and frequency dispersion of the dielectric constant were observed in all ceramics. Dielectric relaxor behavior obeyed the modified Curie―Weiss law. The results revealed that all samples had relaxor characteristics. In addition, for the ceramics with 0.1 wt.% La_2O_3, optimized electrical properties were obtained, which were as follows: ε_r = 1254 (1 kHz), tan δ = 0.0483, d_33 = 192 pC/N, K_p = 0.27,P_r = 29.1 μC/cm^2, and E_c = 29.0 kV/cm.

Three Component Solvent-free Synthesis of Chroman-2,4-dione-based Heterocyclic Ketene Aminal (HKA) Derivatives by “GAP” Chemistry

Fu-Chao Yu,Xiao-Pan Hao,Xiu-Yang Jiang,Sheng-jiao Yan,Jun Lin 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.6

A concise and efficient one-pot synthesis of chroman-2,4-dione-based HKA derivatives by three component reaction of HKAs, triethoxymethane and 4-hydroxycoumarin derivatives under solvent-free and catalyst-free conditions is described. This protocol has many advantages, in that the GAP (Group-Assistant-Purification) chemistry process is involved in this method. As a result, the experimenter can avoid cumbersome process steps such as traditional chromatography and recrystallization purifications. The desired products can be easily obtained by washing the crude products with 95% EtOH.

Seismic response and failure analyses of pile-supported transmission towers on layered ground

Haiyang Pan,Chao Li,Li Tian 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.2

Transmission towers have come to represent one of the most important infrastructures in today’s society, which may suffer severe earthquakes during their service lives. However, in the conventional seismic analyses of transmission towers, the towers are normally assumed to be fixed on the ground without considering the effect of soil-structure interaction (SSI) on the pile-supported transmission tower. This assumption may lead to inaccurate seismic performance estimations of transmission towers. In the present study, the seismic response and failure analyses of pile-supported transmission towers considering SSI are comprehensively performed based on the finite element method. Specifically, two detailed finite element (FE) models of the employed pile-supported transmission tower with and without consideration of SSI effects are established in ABAQUS analysis platform, in which SSI is simulated by the classical p-y approach. A simulation method is developed to stochastically synthesize the earthquake ground motions at different soil depths (i.e. depth-varying ground motions, DVGMs). The impacts of SSI on the dynamic characteristic, seismic response and failure modes are investigated and discussed by using the generated FE models and ground motions. Numerical results show that the vibration mode shapes of the pile-supported transmission towers with and without SSI are basically same; however, SSI can significantly affect the dynamic characteristic by altering the vibration frequencies of different modes. Neglecting the SSI and the variability of earthquake motions at different depths may cause an underestimate and overestimate on the seismic responses, respectively. Moreover, the seismic failure mode of pile-supported transmission towers is also significantly impacted by the SSI and DVGMs.

Detecting Manic State of Bipolar Disorder Based on Support Vector Machine and Gaussian Mixture Model Using Spontaneous Speech

Zhongde Pan,Chao Gui,Jing Zhang,Donghong Cui 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.7

Objective This study was aimed to compare the accuracy of Support Vector Machine (SVM) and Gaussian Mixture Model (GMM) in the detection of manic state of bipolar disorders (BD) of single patients and multiple patients. Methods 21 hospitalized BD patients (14 females, average age 34.5±15.3) were recruited after admission. Spontaneous speech was collected through a preloaded smartphone. Firstly, speech features [pitch, formants, mel-frequency cepstrum coefficients (MFCC), linear prediction cepstral coefficient (LPCC), gamma-tone frequency cepstral coefficients (GFCC) etc.] were preprocessed and extracted. Then, speech features were selected using the features of between-class variance and within-class variance. The manic state of patients was then detected by SVM and GMM methods. Results LPCC demonstrated the best discrimination efficiency. The accuracy of manic state detection for single patients was much better using SVM method than GMM method. The detection accuracy for multiple patients was higher using GMM method than SVM method. Conclusion SVM provided an appropriate tool for detecting manic state for single patients, whereas GMM worked better for multiple patients’ manic state detection. Both of them could help doctors and patients for better diagnosis and mood state monitoring in different situations.

Diversity Distributions and the Anthocyanin Associations of Fungal Endophytes in Diferent Colored Grapevine Leaves

Jing‑Chao Chen,Man Yu,Fang Liu,Jin‑Zhuo Qu,Xiao‑Xia Pan,Han‑Bo Zhang,Ming‑Zhi Yang 한국식물학회 2020 Journal of Plant Biology Vol.63 No.2

Anthocyanins composed the major pigments which conferred sensory and chemical values to red grapes and wines. Multiple factors involved in grape anthocyanin biosynthesis have been greatly covered to date. However, the endophytes which closely associate with plants, their possible roles in plant coloration are still under clear. Our present research frstly investigated the diversity distributions of culturable fungal endophytes (CFE) in diferent colored grapevine leaves which harvested from same vineyard and cultivar, and then proposed method to analyze the possible efects of these fungal endophytes on anthocyanin concentrations of grape cells. In totally 532 endophytic fungal isolates, 19 OTUs belong to 13 genera were isolated from fve color diferent grapevine leaves. Obvious leaf color specifcity of CFE communities were observed distribution in diferent colored grapevine leaves in this experiment. Assessing the infuences of those isolated CFEs on anthocyanin concentrations of a teinturier grape pulp cells via dual culture system revealed that anthocyanin promotion fungal strains were more possibly isolated from red and purple colored grape leaves. And elite CFE strains such as DQ53 and DQ55, both belong to the fungal genus Epicoccum, which conferred signifcant promotion efects on grape cellular anthocyanin contents were selected out. And the transcriptions of anthocyanin biosynthesis association genes MYBA1, UFGT and F3′5′H in grape cells, were signifcantly infuenced by these endophytic fungi, furtherly implicated the involvements of these genes in fungal endophytes-mediated grape cell anthocyanin promotion process. Additionally, endophytic fungi triggered anthocyanin promotion in grape cells seem independently to that of the light mediated anthocyanin synthesis pathway. This work demonstrated that beside other environmental factors, endophytes may also involve in grape anthocyanin metabolisms. And the study provided methods and clues to explore fungal endophytes in colored grape leaves which possibly applied in grape pigmentation processing.