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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean society of Fisheries Technology
Journal Basic Information
Journal DOI :
The Korean Society of Fisheries Technology
Editor in Chief :
Volume & Issues
Volume 40, Issue 4 - Nov 2004
Volume 40, Issue 3 - Aug 2004
Volume 40, Issue 2 - May 2004
Volume 40, Issue 1 - Feb 2004
Selecting the target year
Mesh Selectivity of Durm Net Fish Trap for Elkhorn sculpin(Alcichthys alcicornis) in the Eastern Sea of Korea
Park, Hae-Hoon ; Jeong, Eui-Cheol ; An, Heui-Chun ; Park, Chang-Doo ; Kim, Hyun-Young ; Bae, Jae-Hyun ; Cho, Sam-Kwang ; Baik, Chul-In ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 247~254
DOI : 10.3796/KSFT.2004.40.4.247
The mesh selectivity of the drum net fish trap for elkhorn sculpin(Alcichthys alcicornis) in the estern sea of Korea was described. The selection curve for the elkhorn sculpin caught from the experiments between June 2003 and December 2003 was by SELECT(Share Each Length Class's Catch Total)model and by Kitahaa's method to a polynomial equation and two parameter logistic selection curve. The selection curve by SELECT model showed to be equal probability of entrance of the elkhorn sculpin in the large(55mm) and small(20mm) mesh traps by minimum AIC (Akaike Information Criteria). The equation of selectivity curve obtained by Kitahara's method using a logistic function with least square method was
, where R=1/m, and/and m are total length and mesh size, respectively. The mesh selectivity curve showed that the current regulated mesh size(35mm) for the trap was corresponded to 21.4cm in the
of the selection curve for the elkhorn sculpin.
The Opening Efficiency of half size modified net for the Anchovy Boat Seine
An, Young-Su ; Jang, Choong-Sik ; Lee, Ju-Hee ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 255~267
DOI : 10.3796/KSFT.2004.40.4.255
This study was conducted in order to improvement of fishing gear and fishing operating system for anchovy boat seine by bag net A-type and B-type was attached with half size modified nets. Field experiments were carried out observe geometry of nets by catcher boats. The obtained results are summarized as follows : The actual ratio of net opening in each part of the half size modified nets was increased from fore part to back part of the nets as shown the smallest value about 20% in wing net and the biggest value about 110% in bag net. In addition, vertical net opening of B-type net as measured as 10.9~11.8m in fore bag net and 5.8~8.0m in after bag net were 1~2m greater than 9.0~13.6m of A-type one, and 2~3m less than 9.3~10.4m of A-type one, respectively. Vertical net opening of half size modified net was shown as less variation of towing depth from wing net to inside wing net than those of traditional nets due to stable vertical performance. The mesh distortion or drift and variation of vertical net opening were decreased by improvement of bag nets in order to minimized shape of net pocket phenomenon whenever towing speed is slow. Bag net B-Type attached with dual flapper was shown as less variation in width of bag net and less escapement of anchovy.
A Study on Improvement for Fishing Gear and Method of Pound Net - I - Net Shapes of the Commerical Net in the Flow -
Yun, Il-Bu ; Lee, Ju-Hee ; Kwon, Byeong-Guk ; Cho, Young-Bok ; Yoo, Jae-Bum ; Kim, Seong-Hun ; Kim, Boo-Young ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 268~281
DOI : 10.3796/KSFT.2004.40.4.268
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=
=0.98) in case of the upperward flow with fish court net and R=
=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
and that of inclined passage net was from 0
and that of the second bag net was from 0
. 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
and that of the inclined passage net was from 0
and that of the fish court net was from 0
. 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.
Abundance of Argentine shortfin squid, Illex argentinus(Castellanos) in Relation to Fluctuation of Water Temperature in the Southwestern Atlantic Ocean
Kim, Yeong-Seung ; Kim, Doo-Nam ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 282~294
DOI : 10.3796/KSFT.2004.40.4.282
Catches of Argentine shortfin squid Illex argentinus showed a sharp decrease, reaching 99,000ton in 1993 and 56,700ton in 1994, and then increased again reaching 130,300ton in 1997 from 78,600 ton in 1996. The Korean squid jigging fishery around Falkland for Illex argentinus commences usually its operation in January and lasts August and peak in catch was showed from March to May. To elucidate possible environmental effects on their abundance during the main fishing season in 1993-1994 and 1996-1997, sea surface temperatures were used as an indicator of the position and strength of the oceanographic structures in the Southwestern Atlantic Ocean. The high catch and catch per unit effort of Illex argentinus was showed when the Faliland Current was not affected in the fishing area in 1993 and 1997. But they were sharply decreased from the middle of April 1994 and the late of April 1996 when the Faliland Current directly affects the fishing ground.
Variations of Catch and Fish Species in the Adjacent Fishing Ground of Ceramic Artificial Reefs Constructed on the Coastal Area of Geomun-do, Korea
Park, Seong-Wook ; Kim, Dae-Kweon ; Lee, Jeong-Woo ; Ahn, Hee-Chun ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 295~303
DOI : 10.3796/KSFT.2004.40.4.295
In order to estimate the effect of ceramic artificial reefs on the fisheries resources enhancement, we have studied the variation of catch and species, which were caught by trammel net on the three fishing grounds of ceramic artificial reef, natural reef, and control(non-reef)in the coast of Geomun-do, Korea from 2001 to 2003. Catch per unit effort (CPUE ; g/panel) of fishing ground with the ceramic artificial reef area was 1,621.9g, it was about 67.9% higher than the natural reef area 333.3% higher than the control area. The catch of fish with the ceramic artificial and the natural reef area was not significantly different based on statistical analysis of Tukey test, whereas the relationship between the ceramic artificial reef and the control area was significantly different (p<0.05). Monthly mean number of species caught by the artificial reef area, the natural reef area and the control area was no difference by ANOVA test. The catch of fish was highest in November and lowest in May, whish was associated with the natural reef and the control area. The dominant species were demersal fishes living around rock such as Pagrus majir, Thamnaconus modestus, Stephanolepis sirrhifer, Pleuronichthys curntus, and Ostracion cubicus in the artificial reef area, but demersal of migratory fishes in the natural reef and the control area.
An Experimental Study on the Resistance Performance of Small Size Fishing Vessel
Kim, Do-Jung ; Park, Je-Woong ; Kim, Ju-Nam ; Jeong, Uh-Cheul ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 304~310
DOI : 10.3796/KSFT.2004.40.4.304
Resistance performance of small size fishing vessel is experimentally investigated to find out the effect of fore-body shape and trim for the better hull from development. The tests are performed for five different cases in the high speed circulating water channel(CWC). Wave patterns are observed to investigate the relation between the resistance performance and the wave characteristics.
On the motion characteristics of small trawler in trawling job and sailing
Kang, Il-Kwon ; Kim, Hyung-Seok ; Kim, Jung-Chang ; Kim, Min-Seok ; Jo, Hyo-Jae ; Lee, Chun-Ki ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 311~318
DOI : 10.3796/KSFT.2004.40.4.311
It is very important for the safe navigation and fishing operation to ensure the hull response of a fishing vessel in rough seas. This is an experimental study on the dynamical characteristics of ship's motion during operating job and sailing in the real sea. The experiments were carried out on the small stern trawler in operating job and sailing, and then the ship's roll and pitch motion were simultaneously recorded by P/C according to the wave directions. From these data, the statistical properties and power spectra were obtained and the analysis of ship's motions in the both case were made. The results obtained are summarized follows : (1) The amplitudes of pitch motion don't appear a big different between trawl job and sailing, but at bow seas, its in sailing have a tendency to increase more than in trawl job. The amplitudes of roll motion appear a bog different between trawl job and sailing, but at beam sea, that slightly decreasing tendency. (2) The peak period of pitch motion in trawl job and sailing change, but that of roll motion don't change according to the direction of waves. (3) The warp tention cause the motion of hull to be reduce, if the tention of each side have a ballance.
Development of the Electronic compass for Automatic Correction do Deviation
Ahn, Young-Wha ; Shin, Hyeong-Il ; Shirai, Yasuyuki ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 319~327
DOI : 10.3796/KSFT.2004.40.4.319
The Electronic compass made as a pilot model in this research is comprised of a three axis magnetic sensor, an accustar clinometer, and a fiber optic gyro sensor. The results confirming the output character, performance, and the accuracy of the deviation corrects of each sensor are as follows: 1) As for the output character of the three axis magnetic sensor, the magnetic field showed a cosine curve on the X axis, a - sine curve on the Y axis, and constant figures on the Z sensor. The horizontal component H and the vertical component V of the terrestrial magnetism calculated from the output voltage were 33.2
T and 23.95
T respectively. 2) When the fiber optic gyro sensor is fixed on the electromotive rotation transformation and has made a clockwise rotation with the speed of 10/sec, 20/sec, and 30/sec, the relationship between the output and the rotation angle of the fiber optic gyro sensor showed proportionally constant values. 3) When the magnetic field was induced with a magnet, the deviation before the correction was significant at a high of 25. However, the deviation after the correction using Poisson correction was in the 2 range, significantly lower than before the correction. It was confirmed that automatic deviation corrects are possible with the electronic compass made as a pilot model in this research.
A Study on the Interlaminar Fracture Toughness of Hybrid Composites
Kim, Hyung-Jin ; Gwark, Dae-Won ; Lee, Hern-Sik ; Kim, Jae-Dong ; Koh, Sung-Wi ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 328~336
DOI : 10.3796/KSFT.2004.40.4.328
This paper describes the effect of loading rate, specimen geometries and material properties for ModeⅠ and Mode Ⅱ interlaminar fracture toughness of hybrid composite by using double cantilever beam (DCB) and end notched flexure (ENF) specimen. In the range of loading rate 0.2~20mm/min, there is found to be no significant effect of loading rate with the value of critical energy release rate (Gc).The value of Gc for variation of initial crack length are nearly similar values when material properties are CF/CF and GF/GF, however, the value of Gc are highest with the increasing intial crack length at CF/GF. The SEM photographs show good fiber distribution and interfacial bonding of hybrid composites when the moulding is the CF/GF.
Effect of sliding velocity on the wear and friction characteristics of a carbon fiber composites
Koh, Sung-Wi ; Yang, Byeong-Chun ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 337~343
DOI : 10.3796/KSFT.2004.40.4.337
This paper presents an experimental study of friction and wear properties of a unidirectional oriented continuous crbon-fiber reinforced epoxy composite at the ambient temperature. Friction and wear experiments were conducted in the three principal sliding direction of the fiber orientation in the composite were selected against the stainless steel counterpart specularly processed were using a pin -on-disc apparatus. Friction coefficient and specific wear rate at various normal loads and sliding velocities wear determined. When sliding took place against smooth and hard counterpart, the hightest were resistance and the lowest friction coefficient were observed in the anti-parallel direction. The wear track of the worn specimens was examined with a scanning electron microscope(SEM) to observe the damaged fibers on the surface. In addition, SEM observations of the worn surfaces allowed to identify the involved different wear mechanisms.
Effect of load on the wear and friction characteristics of a carbon fiber composites
Koh, Sung-Wi ; Yang, Byeong-Chun ; Kim, Hyung-Jin ; Kim, Jae-Dong ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 344~350
DOI : 10.3796/KSFT.2004.40.4.344
This is the study on dry sliding wear behavior of unidirectional carbon fiber reinforced epoxy matrix composite at ambient temperature. The wear rates and friction coefficients against the stainless steel counterpart specularly processed were experimentally determined and the resulting wear mechanisms were microscopically observed. Three principal sliding directions relative to the dominant fiber orientation in the composite wear selected. When sliding took place against smooth and hard counterpart, the highest were resistance and the lowest friction coefficient were observed in the antiparallel direction. When the velocity between the composite and the counterpart went up, the wear rate increased. The fiber destruction and cracking caused fiber bending on the contact surface, which was discovered to be dominant wear mechanism.
A Study on the Structural Shape and Vibrational Characteristics of Aluminum Sandwich Panel
Bae, Dong-Myung ; Son, Jung-Dae ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 351~359
DOI : 10.3796/KSFT.2004.40.4.351
Aluminum honeycomb sandwich panel (AHSP) not only have high flexural rigidity and strength per density but also excellence in anti-vibration and anti-noise properties. Their properties are very useful for build airplane and high speed crafts, which need lighter-weighted and more strengthed element. Recently, the AHSP is regarded as a promising strength member of light structures like the hull of high speed crafts. Generally, the core shape of aluminum sandwich panel (ASP) is the hexagonal shape of honeycomb. But, in this paper, authors proposed the ASP with pyramid core, as the ASP model of new type, and analysed the structural and vibrational characteristics for aluminum pyramid sandwich panel (APSP) as this new ASP type, according to the thickness variation of core and face, the height variation of core. The applied sandwich models have isotropic and symmetrical aluminum faces and pyramid cores. And, the applied boundary conditions are simple, fixed and free support.
Motion of Cylindrical Buoy and Its Mooring Line Tension by Installation Depth under the Action of Waves
Kim, Tae-Ho ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 4, 2004, Pages 360~366
DOI : 10.3796/KSFT.2004.40.4.360
This paper presents a method analyzing the motion of cylindrical buoy moored at 2 points and tensions action on each mooring line under the action of periodic waves. It was found that submersible buoy was more effective than floating one in the severe conditions considering its dynamic motions, wave forces, and mooring line tensions. The wave induced its dynamic responses and mooring line tensions peak when the ratio d/
of the buoy length d to the waves length
was 0.66 due to its natural frequency. The results of this study were in agreement with the existing measurement ones, however, further verifications are needed considering resonance of cylindrical buoy and its displacements to wave height by a series of model tests.