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- Dae Won Yoon
- 2004

In this article, we establish a sharp inequality involving δ-invariant introduced by Chen for submanifolds in quaternionic space forms of constant quaternionic sectional curvature with arbitrary codimension.

- DAE WON YOON, WON YOON
- 2007

In this paper, we study some properties of ruled surfaces with non-degenerate second fundamental form in a 3-dimensional LorentzMinkowski space related to its the Gaussian curvature, the second Gaussian curvature and the mean curvature.

- Young Ho Kim, Dae Won Yoon
- 2007

In this paper, we classify ruled surfaces in Lorentz-Minkowski 3-spaces satisfying some algebraic equations in terms of the second Gaussian curvature, the mean curvature and the Gaussian curvature.

- Dae Won Yoon
- J. Applied Mathematics
- 2012

- Dae Won Yoon, Dong-Soo Kim, Young Ho Kim, Jae Won Lee
- Symmetry
- 2017

For the mean curvature vector field H and the Laplace operator ∆ of a submanifold in the Minkowski space, a submanifold satisfying the condition ∆H = f H + gC is known as a generalized null 2-type, where f and g are smooth functions, and C is a constant vector. The notion of generalized null 2-type submanifolds is a generalization of null 2-type… (More)

- Chul Woo Lee, Young Ho Kim, Dae Won Yoon
- Applied Mathematics and Computation
- 2010

- Dae Won Yoon
- Int. J. Math. Mathematical Sciences
- 2005

We establish inequalities between the Ricci curvature and the squared mean curvature, and also between the k-Ricci curvature and the scalar curvature for a slant, semi-slant, and bi-slant submanifold in a locally conformal almost cosymplectic manifold with arbitrary codimension. Let M be a (2m + 1)-dimensional almost contact manifold with almost contact… (More)

- Dae Won Yoon
- J. Applied Mathematics
- 2014

- Dae Won Yoon, Jae Won Lee
- Symmetry
- 2016

In the present paper, we study helicoidal surfaces in the three-dimensional isotropic space I 3 and construct helicoidal surfaces satisfying a linear equation in terms of the Gaussian curvature and the mean curvature of the surface.

- Miekyung Choi, Young Ho Kim, +5 authors WON YOON
- 2010

The helicoidal surface is a generalization of rotation surface in a Minkowski space. We study helicoidal surfaces in a Minkowski 3-space in terms of their Gauss map and provide some examples of new classes of helicoidal surfaces with constant mean curvature in a Minkowski 3-space.

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