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- 저자 : Jido, Daisuke (검색결과 6 건)
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한지도,이덕찬,Han, Jido,Lee, Deok-Chan 한국어병학회 2022 한국어병학회지 Vol.35 No.1
The aquaculture industry has developed rapidly over the last three decades and is an important industry that supplies over 15% of humans' animal protein intake; therefore, there is a need to increase production to meet the continuous demand. The fish cage farms on the southern coast (Kyengsangnam-do and Jeollanam-do) of Korea are critical resources in aquaculture because they account for approximately 90% of the national total fish cage farms by water area ratio. However, the current aquaculture environment is being gradually affected by climate change, which is a global issue, and its effects are expected to intensify in the future. Therefore, it is urgently imperative to accurately evaluate the effects of climate change on South Korean aquaculture industries and to develop social and national strategies to minimize damage to the fishing industry. The damage to fish farmed in cage farms on the southern coast is increasing annually and the leading causes are high and low water temperature and red tides, which are directly or indirectly related to climate change. At present, global warming can provide opportunities for aquaculture industrialization of fish or other novel species, with economic implications. However, despite such opportunities, the influx of new species can also cause problems such as ecological disturbances, increase in the reproduction frequency of microalgae such as red tide, increase in disease incidence, and occurrence and periods of high water temperatures in summer. The scale of farmed fish mortality is increasing due to the complex effects of these factors. Increased damages due to fish mortality not only have severe economic impacts on the aquaculture industry, but the social costs of responding to the damage and follow-up measures also increase. various active responses can reduce the mortality damage in fish farms such as improving the management skills in aquaculture, improved species breeding, efficient food management, disease prevention, proactive responses, and system-wide improvements. This review article analyzes the large-scale mortality cases occurring in fish cage farms on the southern coast of Korea and proposes measures to mitigate mortality and enhance responses to such scenarios.
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남승일,Hyun-Chul Kim,Atsushi Hosaka,Daisuke Jido,Tetsuo Hyodo 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
We investigate the dependences of the s-wave meson-baryon scattering amplitudes on dierent regularizations within the framework of the chiral unitary model. We employ two dierent regularization schemes, i.e., dimensional and form-factor regularizations, to tame the divergences in the model. We also use those regularization schemes to study the analytic structures of the T-matrices. We nd that while the form-factor regularizaion produces almost the same results as the dimensional regularization does, the on-shell approximation is to some extent limited in the case of the form-factor regularization. Having chosen parameters properly, we show that the regularization dependences can be minimized.
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Photoproduction of Λ*(1405) with the N* and the t -channel Regge contributions
Kim, Sang-Ho,Nam, Seung-il,Jido, Daisuke,Kim, Hyun-Chul American Physical Society 2017 Physical Review D Vol.96 No.1
<P>We investigate the photoproduction of the A(1405) equivalent to A* hyperon resonance, i.e., gamma p -> K(+)A*, employing the effective Lagrangian approach with the t-channel Regge trajectories at tree level. We extensively explore the effects from the nucleon resonances in the vicinity of the threshold root s(th) approximate to 1900 MeV, i.e., N* (2000), N* (2030), N* (2055), N* (2095), and N* (2100), and observe that they are of great importance to reproduce the recent CLAS experimental data. Total and differential cross sections are given as numerical results and compared with the experimental data, in addition to the photon- beam asymmetry. The invariant-mass distributions for gamma p -> K+ pi(0)Sigma(0) via A* are also extracted from the two-body process results, showing a qualitative agreement with the data. We also discuss the constituent-counting rule for the internal structure of A* resulting in that A* appears to be different from a simple three-quark (uds) state.</P>
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Testing the tetraquark structure for the X resonances in the low-lying region
Kim, Hungchong,Kim, K. S.,Cheoun, Myung-Ki,Jido, Daisuke,Oka, Makoto Springer-Verlag 2016 The european physical journal. A, Hadrons and nucl Vol.52 No.7
<P>Assuming the four-quark structure for the X resonances in the low-lying region, we calculate their masses using the color-spin interaction. Specifically, the hyperfine masses of the color-spin interaction are calculated for the possible states in spin-0, spin-1, spin-2 channels. The two states in spin-0 channel as well as the two states in spin-1 channel are diagonalized in order to generate the physical hyperfine masses. By matching the difference in hyperfine masses with the splitting in corresponding hadron masses and using the X(3872) mass as an input, we estimate the masses corresponding to the states J(PC) = 0(++), 1(+-), 2(++). We find that the masses of two states in 1(+-) are close to those of X(3823), X(3900), and the mass of the 2(++) state is close to that of X(3940). For them, the discrepancies are about similar to 10MeV. This may suggest that the quantum numbers of the controversial states are X(3823) = 1(+-), X(3900) = 1(+-), X(3940) = 2(++). In this work, we use the same inputs parameters, the constituent quark masses and the strength of the color-spin interaction, that have been adopted in the previous work on the D- or B-meson excited states. There, it was shown that the four-quark structure can be manifested in their excited states. Thus, our results in this work provide a consistent treatment on open-and hidden-charm mesons as far as the four-quark model is concerned.</P>
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