Journal of the Korean Society of Fisheries and Ocean Technology
/
v.29
no.3
/
pp.200-213
/
1993
A model experiment on a midwater rope trawl net which is used in the North Pacific to catch alaska pollack is carried out in the circulating tank to examine the basic efficiency of the net. The prototype is the net used by M/S Hanil(1, 179GT, 2, 700PS), a Korean trawler. The model net was made according to the Tauti's Similarity Law of Fishing Gear in 1/100 scale by considering the condition of the tank. To measure the basic efficiency of the standard model net, the vertical opening and width between some points marked on the net were measured, and the hydrodynamic resistance were determined. Then the constructive conditions of the net were varied as follows and the factors were measured again to compare the efficiency of those nets with that of the standard net(A-1 type) front weight multiplied 1.5 times: A-2 type. buoyancy and depressing force multiplied 1.7 times: A-3 type. front weight multiplied 1.5 times on A-3 type: A-4 type. depressors rigged at ground rope: B type. cod-end stuffed with cashmylon wad: C type. The results obtained can be summarized as follows: 1. The vertical opening at the center of head rope was steeply decreased with the flow velocity increasing and the vertical opening H(m) can be expressed in H=1.2v super(-1.2)(v : flow velocity in m/sec). The width of the net varied a little when the flow velocity was over 0.4m/sec, and the width of net mouth showed about 37% of the distance between the fore tips of net pendant. The shape of net mouth was almost a circle at 0.2m/sec and then steeply flatted elliptically with the flow velocity increasing and the area of mouth S(m super(2)) can be expressed in S=(1.65-2.3v)$\times$10 super(-2). The hydrodynamic resistance of the net increased almost linearly with the flow velocity increasing and the resistance R(kg) can be expressed in R=3.2$\times$d/l$\times$abv. where d/l denotes the mean of d(diameter of netting twine) and l(length of a leg in a mesh) from wing tip to the end of bag-net except cod-end on the side pannel, and a denotes the strectched circumference of the net at the fore end of a meshed part and b the stretched length of the whole net from wing tip to the end of cod-end. 2. In the condition-varied nets, the vertical opening of head rope showed some increase in every type net except the C type, and the increase showed the greatest in the B type by 30~54%, whereas it showed decrease in the C type by 5~10%. Variation of the area of net mouth showed almost the same tendency as the vertical opening and the increase showed the greatest in the B type by 20%, whereas it showed decrease in the C type by 12%. Hydrodynamic resistance showed some increase in every type compared with the standard net, and the rate of increase indicated 5~10% in the A-2, A-3 and A-4 type, 22% in the B type and 3% in the C type.
Park, Gwang-Je;Lee, Ju-Hee;Kim, Hyung-Seok;Jeong, Sun-Beom;Oh, Taeg-Yun;Bae, Jae-Hyun
Journal of the Korean Society of Fisheries and Ocean Technology
/
v.42
no.3
/
pp.134-147
/
2006
A model experiment using circulation water channel was carried out to investigate the dynamic characteristics of bottom trawl net which can be used in sea mount of North Pacific. Hydrodynamic resistance and shape variation according to the flow velocity and angle of hand rope transformation for net were measured, and experimental value was analyzed as the value of full-scale bottom trawl net. The results summarized are as follows; At the $30^{\circ}$ of angle of hand rope to net, hydrodynamic resistance varied from 0.5kgf to 2.68kgf as the flow velocity increased between 0.31m/s and 0.92m/s, and formula of hydrodynamic resistance for the model net was $F_m=3.04\;{\cdot}\;{\upsilon}^{1.53}$. At the fixed angle of hand rope, Net height was low and Net width was high according to the increase of flow velocity, and in addition, vertical opening was low and Net width was high by the increase of angle of hand rope at the fixed flow velocity. At the $30^{\circ}$ of angle of hand rope to net, net opening area was $0.214m^2$ as flow velocity was 0.61m/s, and formula of net opening area for the model net was $S_m=-0.22{\upsilon}+0.35$. At the $30^{\circ}$ of angle of hand rope to net, catch efficiency seemed to be highest as $0.319m^3/s$ of filtering volume at the 0.76m/s(51kt's) of flow velocity. Shape variation of net showed the gradual laminar transform for the variation of flow velocity but there needed some improvements due to the occurrence of shortening at the ahead of wing net.
Journal of the Korean Society of Fisheries and Ocean Technology
/
v.31
no.1
/
pp.29-44
/
1995
A model experiment on the pair midwater trawl net applicable to 800 PS class Korean pair bottom trawlers was carried out in the special-prepared experimental thank. the tank was prepared as a reverse trapezoid shape in its vertical section by digging out flat soil. The dimension of the tank showed the 9.6 W$\times$43.0 L(m) of the upper fringe and the 4.8 W$\times$38.0 L(m) of the bottom with 3.0m in depth. The depth of water was maintained 2.7m during experiment. The model net was prepared based on the Tauti's similarity law of fishing gear in 1/30 scale considering the dimension of the experimental tank. Mouth performance of the model net during towing were determined by the photographs taken in front of the net mouth with the combinations of towing velocity, warp length and distance between paired boats. The results obtained can be summarized as follows: 1. Vertical opening of the model nets A and B was varied in the range of 0.18~0.88 m and 0.21~0.78 m (which can be converted into 5.4~26.4m and 6.3~23.4 m in the full-scale net) respectively, and was varied predominantly by towing speed. Vertical opening (H which is appendixed m for the model net. f for the full-scale net. A and B for the types of the model net) can be expressed as the function of towing velocity$V_t$as in the model net $V_t$ : m/ sec)$H_{mA}$=1.67$e^{-1.65V_t}$ $H_{mB}$=1.15$e^{-1.13V_t}$, in the full-scale net ($V_t$ : k't) $H_{fA}$=50.27$e^-0.37V_t$ $H_{fB}$=34.46$e^{-0.26Vt}$. 2. Horizontal opening of the model nets An and b was varied in the range of 1.03~1.54m and 1.04~1.55 m (which can be converted into 30.9~46.2 m and 31.2~46.5m in the full-scale net) respectively, and was varied predominantly by distance between paired boats. Horizontal opening (W, appendixes are as same as the former) an be expressed as the function of distance between paired boats $D_b$as in the model net $W_{mA}$=0.69+0.09$D_b$ $W{mB}$=0.73+0.09$D_b$, in the full-scale net $W_{fA}$=20.81+0.09$D_b$ $W_{fB}$=22.11+0.09$D_b$ 3. Net opening area of the model net A and B was varied in the range of 0.28~1.04 $m^2$ and 0.33~0.94$m^2$(which can be converted into 252~936$m^2$ and 297~846$m^2$ in the full-scale net) respectively, and was varied predominantly by towing velocity. Net opening area ($S$, appendixes are as same as the former) van be expressed as the function of towing velocity$V_t$ as in the model net $v_t$ : m/sec) $S_{Ma}$=2.01$e^{-1.54V_T}$ $S_{mA}$=1.40$e^{-1.65V_t}$, in the full-scale net ($V_t$ : k't) $S_{fA}$=1.807$e^-0.35V_t$ $S_{fA}$=1.265$e^{-0.24V_t}$. 4. Filtering volume of the model nets A and B was varied in the range of 0.32~0.55 $m^3$ and 0.37~0.55$m^3$(which can be converted into 8.640~14.850 $m^3$ and 9.990~14.850$m3$in the full~scale net) respectively, and was predominantly varied by towing speed. filtering volume of the model net-A showed the maximum at the towing speed 0.69 m/sec(3 k't in the full-scale net), compared with that of the model net B showed at 0.92 m/sec(4 k't in the full-scale net).
Journal of the Korean Society of Fisheries and Ocean Technology
/
v.40
no.4
/
pp.268-281
/
2004
A study was carried out in order to estimate the deformation of the pound net according to the current by the model test in the circulating water channel. The tension of the frame rope and the variation of net shape were measured to investigate the deforming of the model pound net in the flow. The results are obtained as follows; 1. The experimental equation between tensions (R) of the frame rope and velocity (ν)was found to be R=$19.58v^{1.98}$($r^2$=0.98) in case of the upperward flow with fish court net and R=$26.90v^{1.72}$($r^2$=0.95)at the upperward flow with bag net according to the velocity from 0.0m/s to 0.6m/s, respectively. 2. As the variation of flow speed inside of the model net was gradually decreased according as which is passed through netting panels, in case of the upperward flow with fish court net, the flow speed was about 70% of initial flow speed at 0.1m/s, 60% at 0.2m/s, 50% at 0.3m/s and 40% 0.4~0.6m/s at the measurement point(h) inside of the first bag net, respectively. In case of the upperward flow with bag net, as the flow speed was steeply decreased according as which if passed through the second bag net, it was 30~60% of the initial flow speed and was 20~30% inside of the first bag net and was about 10~20% inside of the inclined passage net. 3. In case of the upperward flow with fish court net, the variation of deformed angle of fish court net was from 0$^{\circ}$ to 70$^{\circ}$and that of inclined passage net was from 0$^{\circ}$ to 63$^{\circ}$and that of the second bag net was from 0$^{\circ}$ to 47$^{\circ}$ . 4. In case of the upperward flow with fish court net, the variation of deformed angle of the second bag net was changed from 0$^{\circ}$ to 70$^{\circ}$and that of the inclined passage net was from 0$^{\circ}$ to 55$^{\circ}$ and that of the fish court net was from 0$^{\circ}$ to 50$^{\circ}$. The depth ratio of the first bag net was changed from 0% to 35% and that of the second bag net was from 0% to 20% and that of the inclined passage net was from 0% to 35%. In the flow speed 0.5m/s, the inclined passage net was raised up to the entry of the bag net and then prevented it more over 90%. 5. To be increased the opening volume of pound net, it needs to attach the added weight outside of the fish court net, inclined passage net and bag net. At the same time, it needs to adjust the tension of the twine for maintenance of the shape.
The author carried out an experiment to determine the resistance of trawl net aboard M/S Saebada, training ship of National Fisheries University of Pusan, 2,275 G/T and 3,600ps. Total tension loaded on warp were measured by the recording tension meter. Resistance of the net is estimated by subtracting the resistance of otter boards and warps from the total tension. Coefficient k and exponent n of the formula on the trawl net deduced by Koyama, $R_N=k\frac{d}{l}abv^n$ were calculated from the resistance of the net obtained. The results obtained are can be summarized as follows : 1. Six seamed net with two net pendant k=11, n=1.8 2. Eight seamed net with three net pendant k=11, n=1.8 3. Ten seamed net with three net pendant k=9, n=1.9 4. Ten seamed net with four net pendant k=9, n=1.9
Transactions of the Korean Society of Mechanical Engineers A
/
v.26
no.7
/
pp.1426-1437
/
2002
Using the Lagrangian explicit time-integration finite element code NET3D which can treat three-dimensional high-velocity impact problems, oblique penetration processes of long rod projectile with yaw against thin plate are simulated. Through the comparison of simulation result with experimental result and other code's computational result, the adaptability and accuracy of NET3D is evaluated under the complex situation in which yaw angle and oblique angle exist simultaneously. Main research contents to be handled in this paper include the followings. First, the accuracy and efficiency estimation of NET3D code result obtained from the oblique penetration simulations of long rod projectile with yaw against thin plate. Second, the effect of increasing impact velocity. Third, the effect of initial yaw for the spaced-plate target. Residual velocities, residual lengths, angular velocities, and final deformed configurations obtained from the NET3D computations are compared with the experimental results and other code's computational results such as Eulerian code MESA and Lagrangian code EPIC. As a result of comparisons, it has been found that NET3D code is superior to EPIC code and MESA code in the prediction capability of residual velocity and residual length of penetrator. The key features obtained from the experiment can be successfully reproduced through NET3D simulations. Throughout the study, the applicability and accuracy of NET3D as a metallic armor system design tool is verified.
Kim, Boo-Young;Yun, Il-Bu;Kwon, Byeong-Guk;Lee, Ju-Hee
Journal of the Korean Society of Fisheries and Ocean Technology
/
v.40
no.2
/
pp.104-114
/
2004
A study was carried out to estimate the deformation of the set net according to the current by the model test in the circulation water channel. The tension of the frame line and the variation of net shapes were measured to investigate the deforming of the model set net in the flow. The results are obtained as follows; 1. The tensions (y) of the frame line according to the flow speed(x) from 0.0m/s to 0.6m/s were expressed by the experimental equation as follow : y= 1814.1x+115.12 2. In case of the upperward flow with fish court net, deformed angle in the upperward net was changed from 0$^{\circ}$ to 79$^{\circ}$, the inclined passage net was from 0$^{\circ}$ to 56$^{\circ}$. Besides, the depth ratio of the first bag net changed from 1.0 to 0.42 and the second bag net was from 1.0 to 0.41, and deformed angle in the downward of the bag net was from 0$^{\circ}$ to 87$^{\circ}$. 3. In case of the upperward flow with bag net, deformed angle in the upperward net was changed from 0$^{\circ}$ to 60$^{\circ}$, the inclined passage net was from 0$^{\circ}$ to 13$^{\circ}$. Besides, the depth ratio of the first bag net changed from 1.0 to 0.27 and the second bag net was from 1.0 to 0.15. In the flow speed 0.3m/s, the inclined passage net rised up to the entry of the bag net and then prevented it more over 90% in 0.5m/s. A deformed angle in the downward of the fish court net was from 0$^{\circ}$ to 58$^{\circ}$. 4. To minimize the deformation of each part in model set net, it needs to attach the moving weight out of the fish court net, inclined passage net and bag net. Besides, it needs to adjust the tension of the net twine for the maintenance of the shape.
Park, Cheoneum;Lee, Changki;Park, Soyoon;Lim, Seungyoung;Kim, Myungji;Lee, Jooyoul
Annual Conference on Human and Language Technology
/
2018.10a
/
pp.273-277
/
2018
기계가 주어진 텍스트를 이해하고 추론하는 능력을 기계독해 능력이라 한다. 기계독해는 질의응답 태스크에 적용될 수 있는데 이것을 기계독해 질의응답이라 한다. 기계독해 질의응답은 주어진 질문과 문서를 이해하고 이를 기반으로 질문에 적합한 답을 출력하는 태스크이다. 본 논문에서는 구조화된 표 형식 데이터로부터 질문에 대한 답을 추론하는 TableQA 태스크를 소개하고, $S^3-NET$을 이용하여 TableQA 문제를 해결할 것을 제안한다. 실험 결과, 본 논문에서 제안한 방법이 EM 96.36%, F1 97.04%로 우수한 성능을 보였다.
As a preliminary study on the sediment flux, concentrations of suspended particulate matter and current speeds were measured at three inlets of Gwangyang Bay during one tidal cycle of a spring tide of March 2003. The suspended sediment flux rate $(g/m^{2}/s)$ at the mouth of Seomjin River (St. K1) was observed to be higher throughout surface layer during ebb tide $(14.3\;g/m^{2}/s)$ and throughout near-bottom layer during the flood tide $(23.2\;g/m^{2}/s),$ resulting in a net upstream-ward transport of$0.9{\times}10^{3}kg/m$ during 13 period. At the inlet toward Yeosu Bay (St. K2), a relatively low rate ($(5.0-6.7\;g/m^{2}/s)$ of sediment flux occurred throughout the water column compared to St. K1, with a depth-integrated net transport of $5.6{\times}10^{3}kg/m$ toward the outer reaches of Gwangyang Bay inlet. At St. K3 located at Gwangyang Bay-side of Noryang Strait, the outward flux toward the Jinju Bay was observed to be dominant during the flood tide $(16.2-23.2\;g/m^{2}/s)$, especially through the mid and near bottom layer, compared to the inward flux throughout the whole water column during the ebb tide $(13.1-19.7\;g/m^{2}/s).$ The net transport at St. K3 was calculated to be $4.0{\times}10^{3}kg/m$ toward the outside of Gwangyang Bay. The outward net transport of suspended sediment at all three inlets seems to be consistent with a trend of bottom sediment texture, which suggests a net movement of sediment from a relatively coarse and poorly sorted inner-bay toward a relatively fine and better sorted outer-bay environment.
Place/Transition(P/T) nets has been used in protocol verification and concurrent system verification since it is suitable for describing concurrency and provides several well-established verification techniques. And it has been used as a base formalism for such high-level Petri nets as colored Petri nets, object-oriented Petri nets and etc. However, when analyzing complex models using P/T nets and P/T nets-based high-level Petri nets, there may be state explosion in reachability analysis due to improper handling of concurrency. In this paper, we define a structural concurrency in P/T nets, propose a partitioning algorithm based on the detected structural concurrency, and provide analysis techniques for such properties as boundedness of places and liveness of transitions, which are performed on compositional reachability graphs. The analysis techniques based on Petri net slices can be used in efficiently analyzing P/T nets-based high-level Petri net models as well as P/T net models.
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