• Kyungpook Mathematical Journal
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• 제46권3호
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• pp.357-365
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• 2006

This paper is a sequel of our previous paper [1]. In this paper, we introduce the notions of regular ideal and partial ideal ($p$-ideal) in a ternary semiring and using these two notions we characterize regular ternary semiring.

• 한국조리학회지
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• 제16권4호
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• pp.124-138
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• 2010

본 연구의 목적은 호텔 및 외식업체의 조리와 식음료 종사원들을 대상으로 식생활 습관이 외식 행동에 영향을 미치는지에 대한 관계를 파악하기 위하여 호텔 및 외식업체 종사자 309명을 대상으로 조사 연구하였다. 조사 연구의 목적을 달성하기 위하여 통계 프로그램 SPSS 14.0을 활용하여 빈도 분석, 요인 분석, t-test, ANOVA 분석 및 다중회귀 분석을 실시하였다. 분석 결과를 보면, 식생활 습관에 대한 측정 항목의 탐색적 요인 분석 결과, 3개의 요인, 건강에 좋지 않은 식품 섭취, 건강에 좋은 식품 섭취, 좋은 식습관으로 분석되었고, 누적분산설명력은 62.250%이었다. 외식 행동에 대한 요인 분석은 음식 선택 중요도와 식당 분위기 및 위치로 분석되고, 전체 설명력은 60.658%였다. 성별에 따라 생활 습관은 차이가 있을 것이다라는 가설을 검정하기 위한 t-test 분석 결과는 부분 채택되었고, 결혼 유무에 따라 식생활 습관에는 차이가 있을 것이다라는 가설을 검정하기 위한 t-test 분석 결과도 부분 채택되었다. 연령에 따라 식생활 습관에는 차이가 있을 것이다 가설을 검정하기 위한 ANOVA 분석 결과, 가설은 부분 채택되었다. 식생활 습관이 음식 선택 중요도에 미치는 영향을 분석하기 위한 다중회귀 분석 결과는 건강에 좋지 않은 식품 섭취($\beta$=0.326, p<0.000), 건강에 좋은 식품 섭취($\beta$=0.290, p<0.000), 좋은 식습관($\beta$=0.305, p<0.000)으로 음식 선택 중요도에 유의한 영향을 미치는 것으로 나타났다. 따라서 식생활 습관은 외식 행동의 음식 선택 중요도에 유의한 영향을 미칠 것이다라는 가설은 채택되었다. 식생활 습관이 식당의 분위기 및 위치에 미치는 영향을 분석하기 위한 다중회귀 분석 결과는 전체 회귀식의 설명력은 1.1%이고, 건강에 좋지 않는 식품 섭취($\beta$=0.002, p<0.965)로 통계적으로 유의하지 않았고, 건강에 좋은 식품 섭취($\beta$=0.309, p<0.000), 좋은 식습관($\beta$=0.l89, p<0.000)으로 통계적으로 유의한 것으로 나타났다. 따라서 호텔 및 외식업체 종사자들의 식생활 습관이 외식 선택 중요도의 식당의 분위기 및 위치에 미치는 영향에 관한 가설은 부분 채택되었다.

• 충청수학회지
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• 제32권1호
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• pp.15-21
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• 2019

Let X be a reduced closed subscheme in ${\mathbb{P}}^n$ and $${\pi}_q:X{\rightarrow}Y={\pi}_q(X){\subset}{\mathbb{P}}^{n-1}$$ be an isomorphic projection from the center $q{\in}{\mathbb{P}}^n{\backslash}X$. Suppose that the minimal free presentation of $I_X$ is of the following form $$R(-3)^{{\beta}2,1}{\oplus}R(-4){\rightarrow}R(-2)^{{\beta}1,1}{\rightarrow}I_X{\rightarrow}0$$. In this paper, we prove that $H^1(I_X(k))=H^1(I_Y(k))$ for all $k{\geq}3$. This implies that Y is k-normal if and only if X is k-normal for $k{\geq}3$. Moreover, we also prove that reg(Y) ${\leq}$ max{reg(X), 4} and that $I_Y$ is generated by homogeneous polynomials of degree ${\leq}4$.

• The Journal of Advanced Prosthodontics
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• 제9권4호
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• pp.278-286
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• 2017

PURPOSE. The aim of this study was to determine the influence of long base lengths of a fixed partial denture (FPD) to rotational resistance with variation of vertical wall angulation. MATERIALS AND METHODS. Trigonometric calculations were done to determine the maximum wall angle needed to resist rotational displacement of an experimental-FPD model in 2-dimensional plane. The maximum wall angle calculation determines the greatest taper that resists rotation. Two different axes of rotation were used to test this model with five vertical abutment heights of 3-, 3.5-, 4-, 4.5-, and 5-mm. The two rotational axes were located on the mesial-side of the anterior abutment and the distal-side of the posterior abutment. Rotation of the FPD around the anterior axis was counter-clockwise, Posterior-Anterior (P-A) and clockwise, Anterior-Posterior (A-P) around the distal axis in the sagittal plane. RESULTS. Low levels of vertical wall taper, ${\leq}10-degrees$, were needed to resist rotational displacement in all wall height categories; 2-to-6-degrees is generally considered ideal, with 7-to-10-degrees as favorable to the long axis of the abutment. Rotation around both axes demonstrated that two axial walls of the FPD resisted rotational displacement in each direction. In addition, uneven abutment height combinations required the lowest wall angulations to achieve resistance in this study. CONCLUSION. The vertical height and angulation of FPD abutments, two rotational axes, and the long base lengths all play a role in FPD resistance form.

• Journal of Korean Neurosurgical Society
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• 제30권4호
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• pp.472-478
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• 2001

Objectives : The authors present a retrospective analysis of 100 consecutive adult patients harboring craniopharyngiomas who underwent microsurgical resection between 1981 and 1999 to assess the long-term outcome of surgical treatment and to determine the most optimal management strategy. Methods : The extent of surgical removal was divided into four categories ; GTR(gross total removal), RSTR(radical subtotal removal), STR(subtotal removal),and PR(partial removal). The median follow-up period was 50 months(4-198). CT scan and/or MR imaging and hormonal status were evaluated to the last follow-up. Results : Visual disturbance was the most common presentation, which was improved in 42 cases and aggravated in 19 cases following the operation. Hypopituitarism was detected in 56 patients preoperatively, 82 during the immediate postoperative period, and 76 at the last follow-up. Improvement of pituitary function was not observed in any of these patients. Twenty of 100 patients showed recurrence at the mean of 27 months(3 to 196). The median progression-free survival(PFS) time of all patients was 145 months and 5-year PFS rate was 74%. Five-year PFS rate of GTR or RSTR group(71%) was significantly higher than that of STR or PR group(30%)(p=0.01). Postoperative radiation therapy significantly prolonged the PFS from 94 months in non-radiation group to 182 months(p=0.002). However, there was no statistical difference in number of patients who required hormonal replacement therapy between radiation and non-radiation group. Conclusion : Visual disturbance can be improved by early diagnosis and surgical decompression. GTR or RSTR in selected patients is considered a proper surgical strategy. Post-operative radiation therapy for residual tumors must be considered, although the ideal timing of radiation therapy is to be determined.

• Journal of Animal Science and Technology
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• 제47권2호
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• pp.177-186
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• 2005

Xenotransplantation may help to overcome the critical shortage of human tissues and organs for human transplantation, Swine represents an ideal source of such organs owing to their anatomical and physiological similarities to human besides their plentiful supply, However, the use of organs across the species barrier may be associated with the risk of transmission of pathogens, specially porcine endogenous retroviruses (PERVs).• Although most of these potential pathogens could be eliminated by pathogen-free breeding, PERVs are not eliminated by this treatment. PERVs are integrated into the genome of all pigs and produced by normal pig cells and infect human cells. They belong to gamma retroviruses and are of three classes viruses: A, B and C. In the present study, PCR based cloning was performed with chromosomal DNA extracted from pigs from domestic pigs in Korea. Amplified PCR fragments of about 1.5 Kb, covering the partial env gene, were cloned into pCR2.l-TOPO vectors and sequenced. A total of 91 env clones were obtained from domestic pigs, Berkshire, Duroc, Landrace and Yorkshire in Korea. Phylogenetic analysis of these genes revealed the presence of only PERV class A and B in the proportion of 58 % and 42 %, respectively. Among these, 28 clones had the correct open reading frame: 18 clones in class A and 10 clones in class B. Since both these PERV classes are polytropic and have the capacity to infect human cells, our data suggest that proviral PERVs have the potential to generate infectious viruses during or after xenotransplantation in human.