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Search Results: 1 - 10 of 60749 matches for " Jun Jin "
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On Modeling and Accuracy Analysis of the Available Bandwidth Measurement Based-on Packet-pair Sampling  [PDF]
Jun LIU, Dafang ZHANG, Junhang JIN
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2008, DOI: 10.4236/ijcns.2008.12021
Abstract: Packet-pair sampling, also called probe gap model (PGM) is proposed as a lightweight and fast available bandwidth measurement method. But measurement tools based on PGM gives results with great uncertainty in some cases. PGM’s statistical robustness has not been proved. In this paper we propose a more precise statistical model based on PGM. We present the new approach by using probability distribution and statistical parameters. We also investigate the use of a PGM bandwidth evaluation method considering a non-fluid cross traffic and present the alternative approach where the bursty nature of the probed traffic could be taken into account. Based on the model, measurement variance and sample size can be calculated to improve the measurement accuracy. We evaluated the model in a controlled and reproducible environment using NS simulations.
An Elementary Derivation of the Five Dimensional Myers-Perry Metric
Jun-Jin Peng
Physics , 2008, DOI: 10.1007/s10714-008-0660-2
Abstract: We derive the five dimensional Myers-Perry metric via an elementary method to solve the vacuum Einstein field equations directly. This method firstly proposed by Clotz is very simple since it merely involves four components of Ricci tensor and only requires us to deal with some equations without second derivatives' terms when the metric ansatz is assumed to take an appropriate form.
Construction and Application of the Multidimensional Table for Knowledge Discovery in Ancient Chinese Books on Materia Medica  [PDF]
Rui Jin, Qian Lin, Jun Zhou, Boyu Sun, Bing Zhang
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B001
Abstract:

Knowledge discovery, as an increasingly adopted information technology in biomedical science, has shown great promise in the field of Traditional Chinese Medicine (TCM). In this paper, we provided a kind of multidimensional table which was well suited for organizing and analyzing the data in ancient Chinese books on Materia Medica. Moreover, we demonstrated its capability of facilitating further mining works in TCM through two illustrative studies of discovering meaningful patterns in the three-dimensional table of Shennong’s Classic of Materia Medica. This work might provide an appropriate data model for the development of knowledge discovery in TCM.

Chest Pain on Exertion: Origin of the Right Coronary Artery from the Left Coronary Sinus, through the Aortic Pulmonary Sulcus with Squeezed, or Anterior Descending Branch Borderline Coronary Lesion?  [PDF]
Jun Luo, Zhihong Zhao, Chan Jin, Xinming Li
Case Reports in Clinical Medicine (CRCM) , 2015, DOI: 10.4236/crcm.2015.44030
Abstract:
The prognosis of patients in whom the right coronary artery (RCA) arises from the left coronary sinus (LCS) is unequal. An initial intramural course of the coronary artery within the aortic media is considered to cause myocardial ischemia in cases of coronary anomalies. In this case report, we present one patient admitted due to chest pain on exertion that suggested angina. Her only risk factor for coronary artery disease was hypertension. Clinical examination findings that the origin of the right coronary artery from the LCS, through the aortic pulmonary sulcus with atherosclerotic narrowing and squeezed of the RCA critical ostial, stenosis at the ostium of the RCA and the middle of left anterior descending (LAD) coronary, intravascular ultrasonography (IVUS) showed LAD and RCA minimal lumen area were 3.9 mm2, 5.9 mm2; plaque burden 66%, 65% respectively. We inserted EXCEL 3.0 × 18 mm stent in LAD stenosis. No complaints and adverse events were noticed during a 1-year follow-up.
Group training on the improvement of college students'career decision-making self-efficacy  [PDF]
Jin-liang Wang, Da-jun Zhang, Jing-jin Shao
Health (Health) , 2010, DOI: 10.4236/health.2010.26082
Abstract: A group training was conducted on 17 college students to improve their career decision-making self-efficacy (CDMSE). The result showed that there was significant difference between the pre-test and the post-test for the experimental group (n = 17), whereas no significant difference was found between the pre-test and the post- test for the control group (n = 17). In the pre-test, there was no significant difference between the experimental group and the control group, and obvious difference between the two groups was found in the post-test. This indicated that the group training was effective on improving the CDMSE of the college students whose scores of CDMSE were below 27% point of the total students.
Quantitative Analysis of Matrine and Oxymatrine in Sophora flavescens Extract and Its Biopesticides by UPLC  [PDF]
Sung Jin Lim, Du Yun Jeong, Geun Hyoung Choi, Byung Jun Park, Jin Hyo Kim
Journal of Agricultural Chemistry and Environment (JACEN) , 2014, DOI: 10.4236/jacen.2014.32008
Abstract:

Successive cartridge clean-up method for the simultaneous determination of matrine and oxyma- trine in biopesticides containing Sophora flavescens extract was developed and validated by UPLC. The clean-up method was established with ENVI-Carb (0.5 g) and C18 SPE (0.5 g) cartridges for the bioactive alkaloid in biopesticides from S. flavescens, and the eluate was analyzed to quantify the matrine and oxymatrine by UPLC. The developed method was validated, and the recovery and LOQ of both materials were 105.0% and 103.6%, and 0.050 and 0.684 mg·kg-1, respectively. Of the twenty one samples, the total content of matrines were analyzed by using the developed method and the result showed the developed successive clean-up method could contribute to the manufacture

Solid-Phase Aromatic Nitration with Mg(NO3)2 on Silica Gel  [PDF]
Tomoko Matsumoto, Ayaka Yamauchi, Jun Ishikawa, Guan-Hong Jin, Jin Matsumoto, Yoshiyuki Fueda, Masahide Yasuda
International Journal of Organic Chemistry (IJOC) , 2017, DOI: 10.4236/ijoc.2017.71001
Abstract: Nitroaromatics are usually prepared using a mixed acid of nitric acid with strong acids. However, the use of strong acids caused dangerous work-up and the disposal of large amounts of acid-waste. Therefore, much effort has been made on the improvement of nitration process without strong acids. We examined solid-phase aromatic nitration with Mg(NO3)2 on silica gel in order to establish the nitration process without strong acids. The nitration of 1,2- and 1,3-, 1,4-dimethoxybenzenes and 4-methylanisole with Mg(NO3)2 proceeded by heating on silica gel at 150°C for 4 - 5 h to produce the nitroaromatics. The nitration of 1,3,5-trimethoxybenzene produced the nitrated dimer, 2,4,6,2’, 4’,6’-hexamethoxy-3-nitrobiphenyl, which was not isolated in other solid-phase nitration. In the cases of naphthalene derivatives, the α-nitrated compounds were obtained. In the cases of p-cresol and 2-naphthol, the esterification occurred at the hydroxyl group to give 4-tolyl nitrate and 2-naphthyl nitrate, respectively. It is synthetic interest to note that nitrate esters were isolated in solid phase. Thus Mg(NO3)2-SiO2 composite was mild reagent for solid-phase nitration. Acidity of Mg(NO3)2-SiO2 composite was determined to be pH 0.96 by the measurement of absorption spectra on a micro spectrophotometer using meso-tetra(p-cyanophenyl)porphyrin as a pH-indicator. Mg(NO3)2-SiO2 composite made acidic conditions. Therefore, it was suggested that Mg(NO3)2 reacted with proton on silica gel to form the NO+2. Thus, electron-rich aromatic hydrocarbons led the efficient nitration through electrophilic attack of NO+2. After the nitration, acidic Mg(NO3)2-SiO2 composite could be turned into neutrality by exposing wet conditions and disposed safely since the composite did not involve harmful elements. Thus the solid-phase nitration using Mg(NO3)2-SiO2 composite will provide safety and environmentally conscious chemical process.
Marchiafava-Bignami Disease in a Nonalcoholic Diabetic Patient
Sisira Yadala,Jin Jun Luo
Case Reports in Neurological Medicine , 2013, DOI: 10.1155/2013/979383
Abstract: Marchiafava-Bignami disease (MBD) is a rare neurological disorder mostly seen in alcoholic and malnourished patients with a pathognomonic hallmark of corpus callosum demyelination. MBD in nonalcoholics without malnutrition has rarely been reported. We report a case of MBD in a diabetic patient, without alcoholism or malnutrition, caused by a wide range of glycemic level fluctuations. A 38-year-old man presented with sudden onset of alteration in speech and multiple falls in three days. Neurologic examination showed dysarthria, dysmetria, and ataxia but, otherwise, normal cranial nerves, motor and sensory functions, and tendon reflexes. Brain MRI showed symmetric abnormalities in the splenium of the corpus callosum. In addition, demyelination was also observed in bilateral posterior limbs of the internal capsule and brachium ponti. His symptoms significantly improved after stabilization and normalization of his plasma glucose level and administration of multivitamins and corticosteroids. The underlying pathophysiology of the development of MBD in our case is likely to be osmotic stress from a wide range of glycemic fluctuations causing structural and functional disturbance of oligodendrocytes, which may be reversible in its early stage. 1. Introduction Marchiafava-Bignami disease (MBD) is a rare neurodegenerative disorder with a pathognomonic hallmark of corpus callosum demyelination [1]. It was first reported in Italian wine drinkers about 110 years ago [2]. Clinical presentation may vary from mild impairment in consciousness, gait abnormalities, dysarthria, pyramidal signs, seizures, neuropsychiatric, and behavioral alterations to stupor and coma [1]. MBD has mostly been reported in the subjects with chronic heavy alcohol consumption and malnourishment. However, there is paucity of MBD in nonalcoholics in the literature. 2. Case Report A 38-year-old man presented with acute onset of dysarthria and gait disequilibrium resulting in multiple falls in three days. He had a past medical history of diabetes, bipolar disorder, and depression. The records of his home blood-glucose measurements disclosed his plasma glucose levels fluctuated frequently from 30 to 450?mg/dL in the prior three months. He was well nourished without a history of alcoholism. Neurological examination showed normal language but significant dysarthria with bizarre phonation, loss of prosody, slow articulation, and imprecise consonant utterance. Finger-to-nose and heel-knee-shin testing were dysmetric bilaterally. His gait was strikingly ataxic and wide based. The remaining neurologic
Fault-Tolerant WSN Time Synchronization  [PDF]
Ung-Jin Jang, Sung-Gu Lee, Jun-Young Park, Sung-Joo Yoo
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.210089
Abstract: This paper proposes a new fault-tolerant time synchronization algorithm for wireless sensor networks that requires a short time for synchronization, achieves a guaranteed time synchronization level for all non-faulty nodes, accommodates nodes that enter suspended mode and then wake up, is computationally efficient, operates in a completely decentralized manner and tolerates up to f (out of 2 f + 1 total) faulty nodes. The performance of the proposed algorithm is analyzed, and an equation is derived for the resynchronization interval required for a specific level of synchronization precision. Results obtained from real runs on multi-hop networks are used to demonstrate the claimed features of the proposed algorithm.
The property of rayleigh scattering for an anisotropic dielectric ellipsoid  [PDF]
Ying-le Li, Jin Li, Ming-jun Wang, Qun-feng Dong
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.31006
Abstract: The distribution of electric field of an anisotropic dielectric elliptic sphere is presented by reforming both the electromagnetic parameter and shape parameter of this ellipsoid based on the scales transformation of electromagnetic theory. The obtained results are tested. The RCS of the anisotropic target is developed. Simulations show that the direction of incident electric field and the dielectric constant tensor influences RCS remarkably but the target’ size doesn’t have a great effect on it. The obtained results have some significance in the research of electromagnetic scattering by a complicated anisotropic target.
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