Young Jin Suh

Bio: Young Jin Suh is an academic researcher from Kyungpook National University. The author has contributed to research in topics: Ricci curvature & Jacobi operator. The author has an hindex of 34, co-authored 364 publications receiving 4180 citations. Previous affiliations of Young Jin Suh include UPRRP College of Natural Sciences & St. Vincent's Health System.

A new characterization of ruled real hypersurfaces in complex space forms

Abstract: The purpose of this paper is to give another new characterization of ruled real hypersurfaces in a complex space form (c), c0 in terms of the covariant derivative of its Weingarten map in the direction of the structure vector .

A Multicenter Phase II Trial of Neoadjuvant Chemotherapy with Docetaxel and Gemcitabine in Locally Advanced Breast Cancer.

Abstract: Purpose The current multicenter phase II study was conducted to evaluate the efficacy and safety of the combination of docetaxel and gemcitabine as neoadjuvant chemotherapy (NAC) for locally advanced breast cancer. Methods A total of 98 patients with stage II-III breast cancer were enrolled. The primary endpoint was pathological complete response (pCR) rate of invasive cancer after the completion of the fourth cycle of NAC. The secondary endpoints included response rate (RR), rate of breast-conserving surgery, toxicity, and disease-free survival (DFS). This study is registered with ClinicalTrials.gov (NCT01352494). Results pCR in the breast and the axillary lymph node was observed in seven of the 98 enrolled patients (7.1%). The overall clinical RR, including partial responses, was 65.3%. Breast-conserving surgery was performed in 75 of the 98 assessable patients (76.5%). Neutropenia was frequent and was observed in 92 of the 98 patients (93.9%), including grade 3 and 4 in 24 patients (24.5%) and 63 patients (64.3%), respectively. Dose reductions were required for 30 of the 92 patients (32.6%). After a median follow-up of 24 months, the overall DFS of the group was 86.7%. Conclusion The combination of docetaxel and gemcitabine did not improve pCR. However, this regimen has shown potential as a NAC by producing a reasonable rate of breast-conserving surgery and favorable responses in patients with locally advanced breast cancer. The therapeutic efficacy of this regimen will be determined in additional trials to overcome the limitations of the current study.

Conformally Recurrent Riemannian Manifolds with Harmonic Conformal Curvature Tensor

Abstract: In this paper, we give a complete classification of conformally recurrent Riemannian manifolds with harmonic conformal curvature tensor and to give another generalization of conformally symmetric Riemannian manifolds.

Hopf hypersurfaces in complex two-plane grassmannians with lie parallel normal jacobi operator

Abstract: In this paper we give some non-existence theorems for Hopf hypersurfaces in the complex two-plane Grassmannian G2(C) with Lie parallel normal Jacobi operator R̄N and totally geodesic D and D ⊥ components of the Reeb flow. 0. Introduction The Jacobi fields along geodesics of a given Riemannian manifold (M̄, ḡ) play an important role in the study of differential geometry. It satisfies a very well-known differential equation. This classical differential equation naturally inspires the so-called Jacobi operators. That is, if R̄ is the curvature operator of M̄ and X is any vector field tangent to M̄ , the Jacobi operator with respect to X at x ∈ M̄ , R̄X ∈ End(TxM̄), is defined as R̄X(Y )(x) = (R̄(Y,X)X)(x) for all Y ∈ TxM̄ , being a self-adjoint endomorphism of the tangent bundle TM̄ of M̄ . Clearly, each vector field X tangent to M̄ provides a Jacobi operator with respect to X (See [7] and [9]). If the structure vector field ξ = −JN of a real hypersurface M in complex projective space Pn(C) is invariant under the shape operator, ξ is said to be Hopf, where J denotes a Kähler structure of Pn(C), and N is a unit normal vector field of M in Pn(C). In the quaternionic projective space HP Pérez and Suh [10] classified the real hypersurfaces in HP with D⊥-parallel curvature tensor ∇ξνR = 0 for ν = 1, 2, 3, where R denotes the curvature tensor of M in HP and D⊥ is a distribution defined by D⊥ = Span {ξ1, ξ2, ξ3}. In this case they are congruent to a tube of radius π4 over a totally geodesic quaternionic submanifold HP k in HP, 2 ≤ k ≤ m− 2. Received September 22, 2009; Revised July 2, 2010. 2010 Mathematics Subject Classification. Primary 53C40; Secondary 53C15.

Real Hypersurfaces in complex hyperbolic two-plane Grassmannians with commuting shape operator

Abstract: In this paper we prove a non-existence of real hypersurfaces in complex hyperbolic two-plane Grassman- niansSU2;m=S.U2 Um/,m 3, whose structure tensorsf igiD1;2;3 commute with the shape operator.

The Bethesda System for Reporting Thyroid Cytopathology.

Abstract: Objective To address terminology and other issues related to thyroid fine-needle aspiration (FNA), the National Cancer Institute (NCI) hosted The NCI Thyroid FNA State of the Science Conference. The conclusions regarding terminology and morphologic criteria from the NCI meeting led to the Bethesda Thyroid Atlas Project and form the framework for the Bethesda System for Reporting Thyroid Cytopathology. Design Participants of the Atlas Project were selected from among the committee members of the NCI FNA State of the Science Conference and other participants at the live conference. The terminology framework was based on a literature search of English language publications dating back to 1995 using PubMed as the search engine; online forum discussions ( http://thyroidfna.cancer.gov/forums/default.aspx ); and formal interdisciplinary discussions held on October 22 and 23, 2007, in Bethesda, MD. Main outcome For clarity of communication, the Bethesda System for Reporting Thyroid Cytopathology recommends that each report begin with one of the six general diagnostic categories. Each of the categories has an implied cancer risk that links it to an appropriate clinical management guideline. Conclusions The project participants hope that the adoption of this framework will facilitate communication among cytopathologists, endocrinologists, surgeons, and radiologists; facilitate cytologic-histologic correlation for thyroid diseases; facilitate research into the understanding of thyroid diseases; and allow easy and reliable sharing of data from different laboratories for national and international collaborative studies.

Open versus laparoscopic surgery for mid-rectal or low-rectal cancer after neoadjuvant chemoradiotherapy (COREAN trial): survival outcomes of an open-label, non-inferiority, randomised controlled trial.

Abstract: Summary Background Compared with open resection, laparoscopic resection of rectal cancers is associated with improved short-term outcomes, but high-level evidence showing similar long-term outcomes is scarce. We aimed to compare survival outcomes of laparoscopic surgery with open surgery for patients with mid-rectal or low-rectal cancer. Methods The Comparison of Open versus laparoscopic surgery for mid or low REctal cancer After Neoadjuvant chemoradiotherapy (COREAN) trial was an open-label, non-inferiority, randomised controlled trial done between April 4, 2006, and Aug 26, 2009, at three centres in Korea. Patients (aged 18–80 years) with cT3N0–2M0 mid-rectal or low-rectal cancer who had received preoperative chemoradiotherapy were randomly assigned (1:1) to receive either open or laparoscopic surgery. Randomisation was stratified by sex and preoperative chemotherapy regimen. Investigators were masked to the randomisation sequence; patients and clinicians were not masked to the treatment assignments. The primary endpoint was 3 year disease-free survival, with a non-inferiority margin of 15%. Analysis was by intention to treat. This trial is registered with ClinicalTrials.gov, number NCT00470951. Findings We randomly assigned 340 patients to receive either open surgery (n=170) or laparoscopic surgery (n=170). 3 year disease-free survival was 72·5% (95% CI 65·0–78·6) for the open surgery group and 79·2% (72·3–84·6) for the laparoscopic surgery group, with a difference that was lower than the prespecified non-inferiority margin (–6·7%, 95% CI −15·8 to 2·4; p Interpretation Our results show that laparoscopic resection for locally advanced rectal cancer after preoperative chemoradiotherapy provides similar outcomes for disease-free survival as open resection, thus justifying its use. Funding National Cancer Center, South Korea.

Decreased Morbidity of Laparoscopic Distal Gastrectomy Compared With Open Distal Gastrectomy for Stage I Gastric Cancer: Short-term Outcomes From a Multicenter Randomized Controlled Trial (KLASS-01).

Abstract: Objective:To determine the safety of laparoscopy-assisted distal gastrectomy (LADG) compared with open distal gastrectomy (ODG) in patients with clinical stage I gastric cancer in Korea.Background:There is still a lack of large-scale, multicenter randomized trials regarding the safety of LADG.Method

The Foundations Of Differential Geometry

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