MARINE TOURISM RESOURCE DEVELOPMENT IN KOREA

Resource /Energy Economics and Policy,

Structure stability evaluation of offshore heave compensator using multi-body dynamics analysis method

Heave compensator attenuate vessel heave motion during drilling operation of drillship. Heave compensator functions as damping form motion of drillship, such as principle spring of suspension system. The load transfers on the parts of heave compensator. Stress and deformation of all parts is evaluated to diagnose the stability of the compensator. This study makes a decision on the safety of structure. Results of analysis confirm the structure stability of heave compensator for simulation. This result can be used as data for structural analysis to determine safety of a structure

Pattern of Failure in Bladder Cancer Patients Treated with Radical Cystectomy: Rationale for Adjuvant Radiotherapy

Thus far, the role of adjuvant radiotherapy (RT) after radical cystectomy (RC) in urinary bladder cancer patients has yet to be defined. The purpose of this study is to analyze patterns of failure, and suggest the rationale for RT. Between 1986 and 2005, a total of 259 patients treated with RC and pelvic lymph node dissection was enrolled. The age range was 27-82 yr (median, 62 yr). Node positivity increased according to tumor staging. Patients were divided into the following two groups based on pathologic analysis: organ-confined disease group (n=135) and extravesical/lymph node-positive disease group (n=80). Pelvic failures (PF) were observed in 8 (4.9%) in organ-confined disease group, and 21 (21.7%) in extravesical/lymph node-positive disease group. Five-year PF-free survival rates were 91.2% in organ-confined disease group and 68.0% in extravesical/lymph node-positive disease group. Five-year cancer-specific survival rates were 86.2% in organ-confined disease group and 53.9% in extravesical/lymph node-positive disease group. In conclusion, a relatively high PF rate was observed in extravesical lymph node-negative and lymph node-positive disease patients in this study. Adjuvant pelvic RT may be considered to reduce pelvic failures in extravesical lymph node-positive bladder cancer. Future prospective trials are required to test the clinical benefit of adjuvant RT

Protective effects of protocatechuic acid against cisplatin-induced renal damage in rats

The protective effects of an extract from bitter melon (. Momordica charantia, Cucurbitaceae) against oxidative stress was previously reported and found that protocatechuic acid (PCA) was one of the major phenolic constituents in the extract. The renoprotective effect of PCA from bitter melon was investigated in the present study. In the LLC-PK1 cellular model, the decline in cells viabilities induced by oxidative stress, such as that induced by sodium nitroprusside, pyrogallol, and SIN-1, was significantly and dose-dependently inhibited by PCA. In the in vivo model, the cisplatin-treated rats showed increased plasma levels of creatinine, decreased creatinine clearance, and increased urine protein levels. However, these parameters related to renal dysfunction were markedly attenuated by PCA treatment. Administration of PCA resulted in remarkable improvement in the histological appearance and reduction in tubular cell damage in the cisplatin-treated rat kidneys. Moreover, the elevated levels of pro-caspase-3 induced by cisplatin in rat kidneys were down-regulated by PCA co-treatment. These results suggest that PCA has protective activity against anticancer drug-induced oxidative nephrotoxicity

Numerically hypercyclic polynomials

In this paper, we show that every complex Banach space X with dimension at least 2 supports a numerically hypercyclic d-homogeneous polynomial P for every . Moreover, if X is infinite-dimensional, then one can find hypercyclic non-homogeneous polynomials of arbitrary degree which are at the same time numerically hypercyclic. We prove that weighted shift polynomials cannot be numerically hypercyclic neither on c (0) nor on a"" (p) for 1 a parts per thousand currency sign p < a. In contrast, we characterize numerically hypercyclic weighted shift polynomials on a""(a).S. G. Kim was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (2010-0009854) and by Kyungpook National University Research Fund, 2012. A. Peris was supported in part by MICINN and FEDER, Project MTM2010-14909, and by Generalitat Valenciana, Project PROMETEO/2008/101. H. G. Song is partially supported by the BK21 program (KNU) of the government of the republic of Korea.Kim, SG.; Peris Manguillot, A.; Song, HG. (2012). Numerically hypercyclic polynomials. Archiv der Mathematik. 99(5):443-452. https://doi.org/10.1007/s00013-012-0445-4S443452995Ansari S.I.: Hypercyclic and cyclic vectors. J. Funct. Anal. 128, 374–383 (1995)Ansari S.I.: Existence of hypercyclic operators on topological vector spaces. J. Funct. Anal. 148, 384–390 (1997)Aron R.M., Miralles A.: Chaotic polynomials in spaces of continuous and differentiable functions. Glasg. Math. J. 50, 319–323 (2008)F. Bayart and E. Matheron, Dynamics of linear operators, Cambridge Tracts in Mathematics 179, Cambridge University Press, Cambridge, 2009.Bernal-González L.: On hypercyclic operators on Banach spaces. Proc. Amer. Math. Soc. 127, 1003–1010 (1999)Bernardes N.C.: On orbits of polynomial maps in Banach spaces. Quaest. Math. 21, 311–318 (1998)Bès J.: Invariant manifolds of hypercyclic vectors for the real scalar case. Proc. Amer. Math. Soc. 127, 1801–1804 (1999)Bès J., Peris A.: Hereditarily hypercyclic operators. J. Funct. Anal. 167, 94–112 (1999)Birkhoff G.D.: Demonstration d’un theoreme elementaire sur les fonctions entieres. C. R. Acad. Sci. Paris 189, 473–475 (1929)Bonet J., Peris A.: Hypercyclic operators on non-normable Fréchet spaces, J. Funct. Anal. 159, 587–595 (1998)Bonet J., Martínez-Giménez F., Peris A.: A Banach space which admits no chaotic operator. Bull. London Math. Soc. 33, 196–198 (2001)F.F. Bonsall and J. Duncan, Numerical ranges of operators on normed spaces and of elements of normed algebras, London Math. Soc. Lecture Note Ser. 2, Cambridge Univ. Press, 1971.F.F. Bonsall and J. Duncan, Numerical ranges II, London Math. Soc. Lecture Note Ser. 10, Cambridge Univ. Press, 1973.Choi Y.S. et al.: The polynomial numerical index of a Banach space. Proc. Edinburgh Math. Soc. 49, 39–52 (2006)Dineen S.: Complex analysis on infinite-dimensional spaces. Springer-Verlag, London (1999)Grosse-Erdmann K.-G., Peris-Manguillot A.: Linear chaos, Universitext. Springer-Verlag, London (2011)C. Kitai, Invariant closed sets for linear operators, Ph.D. thesis, Univ. of Toronto, 1982.Kim S.G.: Norm and numerical radius of 2-homogeneous polynomials on the real space $${\ell_{p}^{2}}$$ , (1 < p < ∞). Kyungpook Math. J. 48, 387–393 (2008)Kim S.G., Martin M., Meri J.: On the polynomial numerical index of the real spaces c 0, l 1 and l ∞. J. Math. Anal. Appl. 337, 98–106 (2008)Kim S.G., Peris A., Song H.G.: Numerically hypercyclic operators. Integral Equations and Operator Theory 72, 393–402 (2012)Martínez-Giménez F., Peris A.: Existence of hypercyclic polynomials on complex Fréchet spaces. Topology and its Appl. 156, 3007–3010 (2009)Martínez-Giménez F., Peris A.: Chaotic polynomials on sequence and function spaces. Int. J. Bifurcation and Chaos 20, 2861–2867 (2010)Peris A.: Chaotic polynomials on Banach spaces. J. Math. Anal. Appl. 287, 487–493 (2003)Peris A.: Erratum to “Chaotic polynomials on Fréchet spaces”. Proc. Amer. Math. Soc. 129, 3759–3760 (2001)Rolewicz S.: On orbits of elements. Studia Math. 32, 17–22 (1969)Salas H.N.: Hypercyclic weighted shifts. Trans. Amer. Math. Soc. 347, 993–1004 (1995

Numerically hypercyclic operators

An operator T acting on a normed space E is numerically hypercyclic if, for some (x, x*) is an element of Pi(E), the numerical orbit {x*(T-n(x)) : n >= 0} is dense in C. We prove that finite dimensional Banach spaces with dimension at least two support numerically hypercyclic operators. We also characterize the numerically hypercyclic weighted shifts on classical sequence spaces.Hyun Gwi Song(Corresponding Author) is supported partially by BK21 program.Kim, SG.; Peris Manguillot, A.; Song, HG. (2012). Numerically hypercyclic operators. Integral Equations and Operator Theory. 72(3):393-402. https://doi.org/10.1007/s00020-012-1944-1S393402723Ansari S.I.: Hypercyclic and cyclic vectors. J. Funct. Anal. 128(2), 374–383 (1995)Ansari S.I.: Existence of hypercyclic operators on topological vector spaces. J. Funct. Anal. 148(2), 384–390 (1997)Badea C., Grivaux S., Müller V.: Multiples of hypercyclic operators. Proc. Amer. Math. Soc. 137, 1397–1403 (2008)Bayart F., Matheron E.: Dynamics of Linear Operators, Cambridge Tracts in Mathematics, vol. 179. Cambridge University Press, Cambridge (2009)Bernal-González L.: On hypercyclic operators on Banach spaces. Proc. Amer. Math. Soc. 127, 1003–1010 (1999)Birkhoff G.D.: Demonstration d’un theoreme elementaire sur les fonctions entieres. C. R. Acad. Sci. Paris 189, 473–475 (1929)Bonsall, F.F., Duncan, J.: Numerical ranges of operators on normed spaces and of elements of normed algebras. London Math. Soc. Lecture Note Ser. 2, (Cambridge Univ. Press, 1971)Bonsall, F.F., Duncan, J.: Numerical ranges II. London Math. Soc. Lecture Note Ser. 10, (Cambridge Univ. Press, 1973)Chan K.C., Sanders R.: A weakly hypercyclic operator that is not norm hypercyclic. J. Operator Theory 52, 39–59 (2004)Choi Y.S., Garcia D., Kim S.G., Maestre M.: The polynomial numerical index of a Banach space. Proc. Edinburgh Math. Soc. 49, 39–52 (2006)Costakis G.: On a conjecture of D Herrero concerning hypercyclic operators. C. R. Acad. Sci. Paris Sér. I Math. 330, 179–182 (2000)Grosse-Erdmann K.-G.: Hypercyclic and chaotic weighted shifts. Studia Math. 139, 47–68 (2000)Grosse-Erdmann K.-G., Peris A.: Linear chaos, Universitext. Springer-Verlag, (2011)Kim S.G.: Norm and numerical radius of 2-homogeneous polynomials on the real space $${\ell_p^2, (1 < p < \infty)}$$ . Kyungpook Math. J. 48, 387–393 (2008)Kim S.G., Martin M., Meri J.: On the polynomial numerical index of the real spaces c 0, l 1 and l ∞. J. Math. Anal. Appl. 337, 98–106 (2008)Martínez-Giménez F., Peris A.: Chaos for backward shift operators. Internat. J. Bifur. Chaos Appl. Sci. Engrg. 12, 1703–1715 (2002)Peris A.: Multi-hypercyclic operators are hypercyclic. Math. Z. 236, 779–786 (2001)Read C.J.: The invariant subspace problem for a class of Banach spaces. II. Hypercyclic operators. Israel J. Math. 63, 1–40 (1988)Rolewicz S.: On orbits of elements. Studia Math. 32, 17–22 (1969)Salas H.N.: A hypercyclic operator whose adjoint is also hypercyclic. Proc. Amer. Math. Soc. 112, 765–770 (1991)Salas H.N.: Hypercyclic weighted shifts. Trans. Amer. Math. Soc. 347(3), 993–1004 (1995

Causes and predictors of patient's dissatisfaction after uncomplicated total knee arthroplasty

We aimed to identify the causes and predictors of patient's dissatisfaction after total knee arthroplasty (TKA). Patient's satisfaction was evaluated in 438 TKAs. Causes of patient dissatisfaction were identified using patient interview, physical examinations, laboratory and radiographic tests, and relevant medical consultations. Investigation of 33 dissatisfied knees identified knee-related symptoms in 16 knees (48.5%) and the symptoms unrelated to the replaced knee in 17 knees (51.5%). Multivariate logistic regression analysis revealed that worse preoperative Western Ontario McMaster University Osteoarthritis Index scale pain score and postoperative decrease in range of motion were significantly associated with postoperative dissatisfaction (odds ratio, 7.6 and 2.1, respectively). This study demonstrates that residual symptoms or dysfunctions not directly associated with the replaced knee could be a frequent cause of postoperative dissatisfaction after TKA in osteoarthritic patients