• Fisheries and Aquatic Sciences
• /
• v.15 no.4
• /
• pp.337-343
• /
• 2012

The Korean bottom trawl survey was conducted using a trawl designed by the National Fisheries Research and Development Institute (NFRDI). The capture efficiency and size selectivity of this trawl for snow crab Chionoecetes opilio was investigated by experimental tows. An auxiliary sampling net (underbag) was attached beneath the trawl net to capture crabs escaping under the trawl footrope. Experimental tows were made by the same vessel speed (3.4 knots) as in the bottom trawl survey, but toing time was shortened from the standard 30 min to 10 min to reduce possible trawl distortion due to the high catch rate of mud and debris in the underbag. In averaged over 17 tows conducted between 110-383 m depth, trawl efficiency of both males and females combined increased from about 10% at 20 mm (carapace width) to about 70% at 100 mm, with a width of 50% capture equal to 78 mm.

• Bulletin of the Korean Mathematical Society
• /
• v.43 no.3
• /
• pp.519-529
• /
• 2006

The Property P Conjecture States that the 3-manifold $Y_r$ obtained by Dehn surgery on a non-trivial knot in $S^3$ with surgery coefficient ${\gamma}{\in}Q$ has the non-trivial fundamental group (so not simply connected). Recently Kronheimer and Mrowka provided a proof of the Property P conjecture for the case ${\gamma}={\pm}2$ that was the only remaining case to be established for the conjecture. In particular, their results show that the two phenomena of having a cyclic fundamental group and having a homomorphism with non-cyclic image in SU(2) are quite different for 3-manifolds obtained by Dehn filings. In this paper we extend their results to some other Dehn surgeries via the A-polynomial, and provide more evidence of the ubiquity of the above mentioned phenomena.

• Bulletin of the Society of Naval Architects of Korea
• /
• v.22 no.2
• /
• pp.49-65
• /
• 1985

The RIT(Research Institude of Technology) in KTMI(Korea Tacoma Marine Industries, Ltd) has played a vital role in maintaining the comapany's leader ship as a pioneer in the technical development of shipbuilding and new type of special vessel design. As a results, in February of 1981, the RIT could succeed in designing and constructing a small manned test hovercraft. In Arpril of 1983, the RIT started to design a 12M class, 55knots hovercraft with the highly skilled and experienced technology through the development of 4 kinds of SES(Surface Effect Ship), totally 10 vessels. In December of 1984, the diesel-powered 12M class hovercraft of proto type was developed with RIT'S own technical ability. The craft is the first hovercraft in domestic and the first diesel-powered hovercraft in Asia area. The paper describe the progress of development and general review of technology and concept of design about the hovercraft developed.

• Journal of Computational Design and Engineering
• /
• v.2 no.1
• /
• pp.1-15
• /
• 2015

Measured bidirectional reflectance distribution function (BRDF) data have been used to represent complex interaction between lights and surface materials for photorealistic rendering. However, their massive size makes it hard to adopt them in practical rendering applications. In this paper, we propose an adaptive method for B-spline volume representation of measured BRDF data. It basically performs approximate B-spline volume lofting, which decomposes the problem into three sub-problems of multiple B-spline curve fitting along u-, v-, and w-parametric directions. Especially, it makes the efficient use of knots in the multiple B-spline curve fitting and thereby accomplishes adaptive knot placement along each parametric direction of a resulting B-spline volume. The proposed method is quite useful to realize efficient data reduction while smoothing out the noises and keeping the overall features of BRDF data well. By applying the B-spline volume models of real materials for rendering, we show that the B-spline volume models are effective in preserving the features of material appearance and are suitable for representing BRDF data.

• Journal of Ecology and Environment
• /
• v.30 no.1
• /
• pp.97-99
• /
• 2007

Waders inhabiting an area in which A. tyosenense is endemic were examined to determine if they serve as reservoir hosts for the parasite. Of the waders examined, 4 individuals from 2 species were found to be hosts for 18 to 1820 adult worms. Common and velvet scoters, which are known to be the final hosts of A. tyosenense, are rare in the infected areas, while waders are prevalent and prey on the bivalves known to be intermediate hosts of A. tyosenense. Thus, from the experimental results and circumstances presented herein, we conclude that waders are definitive and reservoir hosts of A. tyosenense in nature.

• Proceedings of the KIEE Conference
• /
• 1989.11a
• /
• pp.462-466
• /
• 1989

This paper describes the methods of spline low-order polynomial trajectory planning using only a few limited look-ahead knots on the desired trajectory for the real-time computing. Specifically presented are the mixed joint trajectory planning methods which apply linear or LSPB method to initial and finial segments, overlapped cubic spline method to the other segments, where the displacements for initial and finial segments are chosen to be relatively smaller than the displacements for the other, equidistant segments. Experimental and simulation results of these methods show smooth motions and improved path tracking performances compared with any other interpolated joint trajectory planning methods.

• Journal of the Korean Data and Information Science Society
• /
• v.26 no.3
• /
• pp.749-754
• /
• 2015

This article presents Bayesian approach to regression splines with knots on a grid of equally spaced sample quantiles of the independent variables under functional measurement error model.We consider small area model by using penalized splines of non-linear pattern. Specifically, in a basis functions of the regression spline, we use radial basis functions. To fit the model and estimate parameters we suggest a hierarchical Bayesian framework using Markov Chain Monte Carlo methodology. Furthermore, we illustrate the method in an application data. We check the convergence by a potential scale reduction factor and we use the posterior predictive p-value and the mean logarithmic conditional predictive ordinate to compar models.

• Fashion & Textile Research Journal
• /
• v.5 no.1
• /
• pp.34-42
• /
• 2003

Hair styles vary greatly and are an integral part of the Miao women's costume, often denoting marital status. The hair style was expressed in various styles by using Kokye. Chukye and Byunbal. Hair is swept in to buns and knots of varying size or arranged in huge structures supported with extra hair or wooden pieces. The hair ornament was expressed in various styles turban and hat. Some groups use a turban as an integral part of the style that is wrapped round the head in a specific way. Silver ornaments occupy an important position in the bright and colorful attire and personal adorment of Miao women's in Guizhou. Silver horns, silver crowns, silver hats are peculiar to Miao women's hair style. They are also indispensable hair ornaments of Miao women's. festive dress in Guizhou.

• Korean Journal of Computational Design and Engineering
• /
• v.4 no.1
• /
• pp.19-31
• /
• 1999

One of the non-photorealistic rendering method, a drawing technique which uses only fine curves and dashed line, is widely employed in an knots and post stamps printing. Engraving of the curves and lines are traditionally performed by human engravers which leads to low productivity in printing preparation. As an effort to improve productivity and quality, a drawing automation method which can easily produce a portrait composed of vector data for laser or chemical engraving is proposed. The method shows that it is possible to draw a portrait by controling the width and length of predefined fine lines according to the gray scales a the end points of each fine lines. A gradually controled weighting factor method is proposed in addition to the author previous works to prevent undesirable boundaries in an identical texture region. User interface functions of a commercial CAD system are heavily employed to exploit the presented method.

• Korean Journal of Computational Design and Engineering
• /
• v.4 no.1
• /
• pp.32-42
• /
• 1999

Approximate lofting or skinning is one of practical surface modeling techniques well used in CAD and reverse engineering applications. Presented in this paper is a method for approximately lofting a given set of curves wihin a specified tolereance. It is based on refitting input curves simultaneously on a common knot vector and interpolating them to get a resultant NURBS surface. A concept of reducing the number of interior knots of the common knot vector is well adopted to acquire more compact representation for the resultant surface. Energy minimization is newly introduced in curve refitting process to stabilize the solution of the fitting problem and get more fair curve. The proposed approximate lofting provides more smooth surface models and realizes more efficient data reduction expecially when the parameterization and compatibility of input curves are not good enough. The method has been successfully implemented in a new CAD/CAM product VX Vision? of Varimetrix Corporation.