A Study on the Development of Typhoon Track Forecast Model Based on the Past Track Data

Guo-Zhu Jin,Chae-Uk Song 한국항해항만학회 2004 한국항해항만학회지 Vol.28 No.4

This paper is aimed to develop a mathematical model for making the forecast information of typhoon’s movement such as the estimated movement direction and positions after 24 and 48 hours. The proposed model calculates such kind of information of a typhoon by similar past typhoon’s track data which are selected with three similarity criteria among the database of typhoons’ tracks for past fifty years. We carried out a simulation forecast with No.14 typhoon formed in 1997, and found that the results of the proposed model were reasonable and it would be suitable for a simulation system for training mariners so that they can take suitable actions to evade the typhoons.

A Study on the Development of Typhoon Track Forecast Model Based on the Past Track Data

Jin, Guo-Zhu,Song, Chae-Uk Korean Institute of Navigation and Port Research 2004 한국항해항만학회지 Vol.28 No.4

This paper is aimed to develop a mathematical model for making the forecast information of typhoon's movement such as the estimated movement direction and positions after 24 and 48 hours. The proposed model calculates such kind of information of a typhoon by similar past typhoon's track data which are selected with three similarity criteria among the database of typhoons' tracks for past fifty years. We carried out a simulation forecast with No.14 typhoon formed in 1997, and found that the results of the proposed model were reasonable and it would be suitable for a simulation system for training mariners so that they can take suitable actions to evade the typhoons.

A Study on the Development of Wind and Wave Model of Typhoon

Guo-Zhu Jin,Chae-Uk Song,Dong-il Seol 한국항해항만학회 2004 한국항해항만학회지 Vol.28 No.10

In this paper, after analyzing other models with their advantages and disadvantages, we proposed a simple parametric model for calculating wind speed & direction and wave height & direction at any location around the typhoon at sea. The proposed wind-field model of typhoon is asymmetric, and consists of a circular symmetric wind-field caused by the pressure gradient of stationary typhoon and a moving wind-field caused by the movement of typhoon. By verifying this model through observed data, we found that it is accurate enough to develop the simulation software for training students and seafarers so as to take appropriate actions while being faced with the typhoon at sea.

A Study on the Development of Wind and Wave Model of Typhoon

Jin Guo-Zhu,Song Chae-Uk,Seol Dong-Il Korean Institute of Navigation and Port Research 2004 한국항해항만학회지 Vol.28 No.9

In this paper, after analyzing other models with their advantages and disadvantages, we proposed a simple parametric model for calculating wind speed & direction and wave height & direction at any location around the typhoon at sea. The proposed wind-field model of typhoon is asymmetric, and consists of a circular symmetric wind-field caused by the pressure gradient of stationary typhoon and a moving wind-field caused by the movement of typhoon. By verifying this model through observed data, we found that it is accurate enough to develop the simulation software for training students and seafarers so as to take appropriate actions while being faced with the typhoon at sea.

A Study on the Development of Wind and Wave Model of Typhoon

Guo-Zhu Jin,Chae-Uk Song,Dong-Il Seol 한국항해항만학회 2004 한국항해항만학회지 Vol.28 No.9

In this paper, after analyzing other models with their advantages and disadvantages, we proposed a simple parametric model for calculating wind speed & direction at any location around the typhoon at sea. The proposed wind-field model of typhoon is asymmetric, and consists of a circular symmetric wind-field caused by the pressure gradient of stationary typhoon and a moving wind-field caused by the movement of typhoon. By verifying this model through observed data, we found that it is accurate enough to develop the simulation software for training students and seafarers so as to take appropriate actions while being faced with the typhoon at sea.

Genetic Variation of Growth Hormone Gene and Its Relationship with Milk Production Traits in China Holstein Cows

Zhou, Guo-li,Zhu, Qi,Jin, Hai-guo,Guo, Shan-li Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.3

Associations were analysed between polymorphisms localized in intron 3 of the growth hormone gene (GH-MspI) and milk production traits of 543 China Holstein cows. A PCR-RFLP method was used for identification of genotypes. The following frequencies of genotypes and alleles were found: 0.77, 0.21 and 0.02 for +/+, +/- and -/-, respectively, and 0.87 and 0.13 for $GH^+$ and $GH^-$, respectively. Significant differences between herds were observed in the frequencies of both genotypes and alleles. The results of least squares analysis showed that in all three lactation phases the GH +/+ cows yielded most milk (p<0.01 for lactation I and p<0.05 for lactations II and III), whereas +/- cows showed higher milk fat content than +/+ individuals (p<0.05 for lactation I and II, and p<0.01 for lactation III). The +/+ cows yielded more fat than +/- individuals (p<0.01 only in lactation I). The +/+ cows yielded more milk protein than +/- individuals (p<0.01 for lactation I, II, and III). The +/+ cows produced milk of higher protein content than that of +/- individuals (p<0.05 only in lactation II). Based on these results, we conclude that the +/+ of GH locus should be the favored genotype in China Holstein cow breeds for use in marker-assisted selection programmes.

Development of a position sensitive CsI(Tl) crystal array

Shi, Guo-Zhu,Chen, Ruo-Fu,Chen, Kun,Shen, Ai-Hua,Zhang, Xiu-Ling,Chen, Jin-Da,Du, Cheng-Ming,Hu, Zheng-Guo,Fan, Guang-Wei Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.4

A position-sensitive CsI(Tl) crystal array coupled with the multi-anode position sensitive photomultiplier tube (PS-PMT), Hamamatsu H8500C, has been developed at the Institute of Modern Physics. An effective, fast, and economical readout circuit based on discretized positioning circuit (DPC) bridge was designed for the 64-channel multi-anode flat panel PSPMT. The horizontal and vertical position resolutions are 0.58 mm and 0.63 mm respectively for the 1.0 × 1.0 × 5.0 ㎣ CsI(Tl) array, and the horizontal and vertical position resolutions are 0.86 mm and 0.80 mm respectively for the 2.0 × 2.0 × 10.0 ㎣ CsI(Tl) array. These results show that the CsI(Tl) crystal array with low cost could be applied in the fields of medical imaging and high-resolution gamma camera.

Flutter reliability analysis of suspension bridges based on multiplicative dimensional reduction method

Guo, Junfeng,Zheng, Shixiong,Zhang, Jin,Zhu, Jinbo,Zhang, Longqi Techno-Press 2018 Wind and Structures, An International Journal (WAS Vol.27 No.3

A reliability analysis method is proposed in this paper based on the maximum entropy (MaxEnt) principle in which constraints are specified in terms of the fractional moments instead of integer moments. Then a multiplicative dimensional reduction method (M-DRM) is introduced to compute the fractional moments. The method is applicable for both explicit and implicit limit state functions of complex structures. After two examples illustrate the accuracy and efficiency of this method in comparison to the Monte Carlo simulation (MCS), the method is used to analyze the flutter reliability of suspension bridge. The results show that the empirical formula method in which the limit state function is explicitly represented as a function of variables is only a too conservative estimate for flutter reliability analysis but is not accurate adequately. So it is not suitable for reliability analysis of bridge flutter. The actual flutter reliability analysis should be conducted based on a finite element method in which limit state function is implicitly represented as a function of variables. The proposed M-DRM provide an alternate and efficient way to analyze a much more complicated flutter reliability of long span suspension bridge.

Microwave absorption and photocatalytic activity of MgxZn1−x ferrite/diatomite composites

Guo Wanmi,Wang Sulei,Ren Qifang,Jin Zhen,Ding Yi,Xiong Chun-Yu,Li Jinpeng,Chen Jing,Zhu Yuelei,오원춘 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.2

Mg x Zn 1−x ferrite/diatomite composites were synthesized by a two-step combination process (hydrothermal method and mechanical mixing method). The products were characterized by X-ray diff raction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), UV–visible absorption spectrum (UV–Vis), X-ray photoelectron spectroscope (XPS), and microwave vector network analyzer. The photocatalytic results showed that the degradation rate of Rhodamine B (RhB) was 50–90% after 90 min of visible light. At 2–18 GHz frequency, when the Mg–Zn ratio increases to 0.8, the refl ection loss of a single MgxZn 1−x ferrite reaches − 7.23 dB at 8.75 GHz frequency in 3.5 mm thickness while the ratio is 0.2, the refl ection loss at 10.23 GHz reaches − 4.07 dB. The photocatalytic performance of Mgx Zn 1−x ferrite /diatomite composite for the degradation of RhB and its microwave absorption performance as absorbent are studied. The importance of developing new functional coatings to improve human environment is discussed.

Synthesis and Evaluation of Antitumor Activity

Jin, Guang-Zhu,Song, Gyu-Yong,Zheng, Xiang-Guo,Kim, Yong,Sok, Dai-Eun,Ahn, Byung-Zun The Pharmaceutical Society of Korea 1998 Archives of Pharmacal Research Vol.21 No.2

Fourty eight derivatives of 2-(1-oxyalkyl)-1,4-dioxy-9,10-anthraquinone were synthesized, and their antitumor activity was evaluated. On the whole, 2-(1-hydroxyalkyl)-1,4-dihydroxy-9,10-anthraquinones (DHAQ=1,4-dihydroxy-9,10-anthraquinone) showed stronger cytotoxic activity against L1210 cells than 2-(l-hydroxyalkyl)-1,4-dimethoxy-9,10-anthraquinones(DMAQ =1,4-dimethoxy-9,10-anthraquinone), implying that free hydroxy groups at C-1 and C-4 of the anthraquinone structure are necessary for the cytotoxic activity. The bioactivity of 2-(lhydroxyalkyl)-DHAQ derivatives differed according to the size of alkyl group at C-1;while the elongation of alkyl group over 7 carbon atoms failed to enhance the bioactivity, the derivatives possessing alkyl moiety of 1-6 carbon atoms showed an increase in the cytotoxicity and the antitumor activity in Sarcoma-180; 2-hydroxymethyl-DHAQ ($ED_{50}$, $15\mu\textrm{g}$/ml; T/C, 125%), 2-(1 -hydroxyethyl)-DHAQ($1.9{\mu}g/ml;139.2%)$;, 2-(1-hydroxypropyl)-DHAQ ($7.2{\mu}g$/ml; 135.1%), 2-(1-hydroxybutyl)-DHAQ ($10.2{\mu}g/ml; 125.3%)$, 2-(1-hydroxypentyl)-DHAQ ($23.7{\mu}g/ml; 110.1%$). and 2-(1-hydroxyhexyl)-DHAQ ($58{\mu}g/ml;108%$). Next, 2-(1-Hydroxyalkyl)-DHAQ derivatives were acetylated to produce 2-(1-acetoxyalkyl)-DHAQ analogues. Although the acetylation somewhat enhanced the cytotoxicity, but not the antitumor action. In addition, the presence of phenyl group at $C-1^{l}$ enhanced the cytotoxicity and the T/C value, compared to alkyl groups of same size; 2-(1-hydroxy-1-phenyl)-DHAQ ($ED_{50}$, $5.6{\mu}g$, T/C, 137%).