Biography:

In the past Li-Hua Li has collaborated on articles with Iuon-Chang Lin and Shu FANG. One of their most recent publications is Synthesis and characterization of chitosan/ZnO nanoparticle composite membranes. Which was published in journal Carbohydrate Research.

More information about Li-Hua Li research including statistics on their citations can be found on their Copernicus Academic profile page.

Li-Hua Li's Articles: (9)

Synthesis and characterization of chitosan/ZnO nanoparticle composite membranes

AbstractNovel chitosan/ZnO nanoparticle (CS/nano-ZnO) composite membranes were prepared via the method of sol-cast transformation and studied by UV–vis absorption spectroscopy (UV–vis), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray fluorescence spectrometry (EDX). The characterization revealed that ZnO nanoparticles dispersed homogeneously within the chitosan matrix. The mechanical and antibacterial properties of the product were investigated. The results showed that the ZnO content had an effect on the mechanical properties of CS/nano-ZnO composite membranes, and that the antibacterial activities of CS membranes for Bacillus subtilis, Escherichia coli, and Staphylococcus aureus were enhanced by the incorporation of ZnO. Further, CS/nano-ZnO composite membranes with 6–10 wt % ZnO exhibited high antibacterial activities.

Improvement of signature scheme based on factoring and discrete logarithms☆

AbstractLaih and Kuo proposed two efficient signature schemes based on discrete logarithms and factorization. However, their schemes require many keys for a signing document. In this article, we shall propose an improvement of Laih and Kuo's signature schemes. The improved scheme will outperform their schemes in the number of keys.

Generalization of proxy signature-based on discrete logarithms1

AbstractIn the past few years, many excellent studies on proxy signature schemes have been published. Yet, traditional proxy signature schemes are mainly aimed at dealing with one or two separate proxy conditions each. In this article, the authors shall present a generalized version of the (t1/n1–t2/n2) proxy signature scheme based on the discrete logarithms that can be applied to every proxy situation. The (t1/n1–t2/n2) proxy signature scheme allows the original group of original signers to delegate their signing capability to a designated proxy group. The proxy group of proxy signers can cooperatively generate the proxy signature on behalf of the original group. Any verifier can verify the proxy signature on the message with the knowledge of the identities of the actual original signers and the actual proxy signers. Furthermore, some possible attacks have been considered, and our security analysis shows that none of them can successfully break the proposed scheme.

A new remote user authentication scheme for multi-server architecture☆

AbstractRemote user authentication is used to validate the legitimacy of a remote login user. Conventional user authentication schemes are suited to solve the privacy and security problems for the single client/server architecture environment. However, the use of computer networks and information technology has grown spectacularly. More and more network architectures are used in multi-server environments. In this paper, we propose a new remote user authentication scheme. The scheme can be used in multi-server environments. In our scheme, the system does not need to maintain any verification table, and the users who have registered in the servers do not need to remember different login passwords for various servers. In addition, our scheme can also withstand replay and modification attacks. Furthermore, it allows users to choose their passwords freely, and a user can be removed from the system easily when the subscription expires.

Grassmannian precoding MU-MIMO scheme

AbstractIn this article, a Grassmannian precoding multiuser multiple-input multiple-output (MU-MIMO) scheme for downlink transmission is proposed. The proposed MU-MIMO scheme will perform scheduling and precoding simultaneously at the base station, to obtain both the multiuser diversity gain and the precoding gain, to maximize the system capacity. The precoding method is related to Grassmannian precoding, which extends the point-to-point single-user Grassmannian precoding to point-to-multipoint multiuser Grassmannian precoding. It provides further significant system capacity enhancement than the single user MIMO (SU-MIMO) system and also outperforms the block diagonalization (BD) algorithm under the same simulation environment.

Original ArticleEarly changes of the anemia phenomenon in male 100-km ultramarathoners

AbstractBackgroundSports anemia is a widely observed phenomenon after prolonged running. There are various factors that contribute to sports anemia, including hemodilution, exercise-induced oxidative stress, iron deficiency, gastrointestinal bleeding, hematuria, and hemolysis resulting from foot-strike and/or from compression of contracting muscles on capillaries. Until now, there has been no published report that describes the overall hematological, urinary, and fecal consequences in Asian male ultramarathoners after a 100-km (62.5-mile) ultramarathon event.MethodsA total of 25 male runners were recruited into our study. Blood was drawn 1 week before, immediately after, and then 24 hours subsequent to the race. Hematological samples were analyzed for the anemia phenomenon. Additionally, urinary and fecal samples were collected before and after the race for detection of occult blood.ResultsThe blood hemoglobin and erythropoietin values of the recruited runners showed a statistically significant rise in the immediate post-race values and a rapid drop in values at 24 hours post-race. Blood concentrations of red blood cells and hematocrit were significantly lower at 24 hours post-race compared with pre-race. The white blood cell count, interleukin-6, tumor necrosis factor-alpha, high-sensitivity C-reactive protein, and ferritin all showed significant increases both immediately after and 24 hours post-race compared with pre-race hematological values. There were immediate decreases of both haptoglobin and iron, as well as an increase of total iron-binding capacity levels in post-race blood tests. For both urinary and fecal samples, there was a statistically significant difference between the pre- and post-race results in occult blood.ConclusionRunning a 100-km ultramarathon will induce substantial sports anemia, and oxidative stress response, hemolysis, hematuria, and gastrointestinal bleeding are typical factors that contribute to its onset.

Original ArticleThe impact of hepatitis B carrier on cardiac troponin I in 100-km ultramarathon runners

AbstractBackgroundProlonged endurance exercise is known to cause elevation of cardiac troponin I (cTnI). Previous studies have reported the correlation of several factors with exercise-induced cTnI release. However, the investigation of the predictors for elevated cTnI and postrace kinetics of cTnI after ultramarathon running is lacking, especially in an Oriental population.MethodsTwenty-six participants, including eight hepatitis B virus carrier (HBVc) runners, who finished a 100-km ultramarathon in Taiwan were enrolled. For each participant, blood samples were collected 1 week before the race, as well as immediately and 24 hours after the finish.ResultsThe results showed that 19 runners (73.1%) had postrace elevated cTnI levels and eight (30.8%) had elevated cTnI values lasting more than 24 hours after the run. A multiple linear regression analysis demonstrated that the HBV status was a factor related to the high level of cTnI after 24 hours of running (β = 0.03, p = 0.08). The recovery of plasma cTnI levels was delayed in ultramarathon runners with latent HBV infection. Among HBVc runners, multiple linear regression analyses showed age (β = −0.01), previous running experience (β = −0.06), training distance (β = 0.37), and 4 hours of running distance (β = −0.04) as significant predictors of higher postrace cTnI levels.ConclusionFor most athletes, cTnI values significantly increased immediately following the race in the absence of adverse clinical sequelae, and HBVc runners had higher and prolonged cTnI levels. While several factors are identified for such HBV effects, the specific causes need further elucidation.

Original ArticleThe changes of red blood cell viscoelasticity and sports anemia in male 24-hr ultra-marathoners

AbstractBackgroundIn endurance sports, stress, dehydration and release of chemical factors have been associated with red blood cell (RBC) alterations of structure and function, which may contribute to sports anemia, a well-observed phenomenon during long-distance running. Until now, the investigation of the changes of viscoelastic properties of RBC membrane, a decisive factor of RBC deformability to avoid hemolysis, is lacking, especially in an Oriental population.Methodsnineteen runners were prospectively recruited into our study. Hematological parameters were analyzed before and immediately after the 2015 Taipei 24H Ultra-Marathon Festival, Taiwan. Video particle tracking microrheology was used to determine viscoelastic properties of each RBC sample by calculating the dynamic elastic modulus G′(f) and the viscous modulus G″(f) at frequency f = 20 Hz.ResultsHaptoglobin, RBC count, hemoglobin, hematocrit, mean cell hemoglobin, plasma free hemoglobin and unsaturated iron-binding capacity values of the recruited runners showed a statistically significant drop in the post-race values. Blood concentration of reticulocyte and ferritin were significantly higher at post-race compared with pre-race. 15 out of the 19 runners had a concurrent change in the elastic and the viscous moduli of their RBCs. Changes in the elastic and the viscous moduli were correlated with changes in the RBC count, hemoglobin and hematocrit.ConclusionViscoelasticity properties, the elastic modulus G′(f) and the viscous modulus G″(f) of RBCs are associated with endurance exercise-induced anemia.

Analysis on the Characteristics of Muscle Exertion in Electromyogram During Downward Kick--Take Ten Elite Male Tea Kwon Do Athletes in China as Examples

AbstractUsing the technique of Telemetry EMG system, we test 10 Chinese Elite Male Taekwondo athletes’ front downward kick action (select three group of muscles). The results as follows:1)the left biceps femoris muscle contains the most contractibility and strength; 2) the first force muscles are left erector spinae, right erector spinal and the left gluteus maximus; 3) the right tibialis anterior muscle is the muscle owns longest duration; 4) the greatest contribution of muscle is left femoral two head of the muscle; 5) the mobilization rates are as follows: the left femoral head two muscle fascia lata >Left tensor fasciae latae> Left gluteus maximus, and are more than 100%. The results show that: the surface EMG test analysis technology can be used for testing the rationality of Taekwondo chop technique action. Therefore, this new technology provides theoretical guidance and practice reference for skills and strength training of Taekwondo athletes.

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