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강민제,부창진,김호찬,고영수 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.2
In this paper, a methodology has been proposed according to which, after carrying out a set of soil's resistivity measurements, one can compute the parameters of the multilayer earth structure using a genetic algorithm(GA). The results provided by the GA constitute the indispensable data that can be used in circuital or field simulations of grounding systems. The methodology allows to proceed toward a very efficient simulation of the grounding system and an accurate calculation of potential on the ground's surface.
블럭펄스 변환에 의한 비선형계의 준최적제어에 관한 연구
안두수,이명규,김종부,고영기 成均館大學校 科學技術硏究所 1990 論文集 Vol.41 No.1
This paper presents a method of suboptimal control for nonlinear systems via block pulse transformation. The adaptive optimal control scheme proposed by J.P. Matuszewski is introduced to minimize the performance index. Nonlinear systems are controlled using the obtained optimal control via block pulse transformation. The proposed method is simple and computationally advantageous. Viablity of the this method is established with simulation results for the van der Pole equation for comparision with other methods.
고영실 ( Young Sil Ko ),부정민 ( Jung Min Boo ) 한국가족복지학회 2009 한국가족복지학 Vol.14 No.1
본 연구는 부모의 놀이참여 수준과 유아의 사회적 능력간의 관계를 규명하는데 목적이 있다. 이를 위해 부모 놀이참여 수준의 고·저에 따라 부고-모저 집단, 부고-모고 집단, 부저-모저 집단 그리고 부저-모고 집단으로 분류한 후, 각 집단별 사회적 능력 전체와 하위요인인 대인행동, 활동참여, 지시 따르기, 일과적응에서 어떠한 차이가 있는지 알아보고자 하였다. 연구대상은 제주시 민간어린이집에 재원중인 유아 281명과 그들의 부모 281쌍, 담임교사 281명이다. 연구결과는 다음과 같다. 부고-모고, 부고-모저, 부저-모고, 부저-모저 집단별 유아의 사회적 능력 전체와 하위요인인 대인행동, 활동참여, 지시 따르기, 일과적응 모두에서 유의한 차이를 보였다. 그리고 사회적 능력 전체와 하위요인인 대인행동, 활동참여, 지시따르기, 일과적응 평균은 부고-모저 집단이 가장 높게 나타났으며, 그 다음으로 부고-모고 집단, 부저-모고 집단, 부저-모저 집단 순으로 나타났다. 이러한 결과는 놀이참여자로서 어머니보다 아버지 역할이 유아의 사회적 능력에 더 중요한 영향을 미치며, 유아의 사회적 능력을 향상시키려면 아버지의 놀이참여 수준이 높아야 함을 시사하고 있다. 만약 아버지의 놀이참여 수준이 높다면, 유아의 사회적 능력 발달과 관련해서 어머니의 놀이참여자로서 역할은 비교적 자유로울 수 있으며, 어머니는 유아의 사회적 능력 향상을 위한 상호작용보다 다른 영역에 초점을 맞추어 상호작용 하는 것이 자녀발달에 좀 더 효율적인 대처일 수 있음을 제안하고 있다. The purpose of this study is to clarify the relationship between the level of parent`s participation in play and their young children`s social competence. For this, in accordance with the level of parent`s participation in play with their child, the experimental subjects were divided into four groups: father high-mother low group, both parents high group, both parents low group, and father low-mother high group. In addition, finding out how many differences there were among them regarding interpersonal relations, participation in activities, conformity with instructions and adjustment to daily routines, which are sub-factors of social competence for each group, were studied. The subjects in this study were 281 children including 281 pairs of parents and childcare teachers in Jeju. All four groups were found to have a significant difference in interpersonal relations, participation in activities, conformity with instructions, and adjustment to daily routines, which are sub-factors of young children`s social competence. The Scheffe test revealed that the father high-mother low group had a significant difference from the other three groups. These results imply that the role of the father as a participator in play has a more important effect on young children`s social competence than that of the mother, and that enhanced social competence of young children requires a higher level of the father`s participation in play.
Atypical Ductal Hyperplasia: Risk Factors for Predicting Pathologic Upgrade on Excisional Biopsy
Ko Woon Park,Boo-Kyung Han,Sun Jung Rhee,Soo Youn Cho,Eun Young Ko,Eun Sook Ko,Ji Soo Choi 대한영상의학회 2022 대한영상의학회지 Vol.83 No.3
Purpose To determine the incidence of atypical ductal hyperplasia (ADH) in needle biopsy and the upgrade rate to carcinoma, and to evaluate difference in findings between the upgrade and non-upgrade groups. Materials and Methods Among 9660 needle biopsies performed over 48 months, we reviewed the radiologic and histopathologic findings of ADH and compared the differences in imaging findings (mammography and breast US) and biopsy methods between the upgrade and non-upgrade groups. Results The incidence of ADH was 1.7% (169/9660). Of 112 resected cases and 30 cases followed- up for over 2 years, 35 were upgraded to carcinoma (24.6%, 35/142). The upgrade rates were significantly different according to biopsy methods: US-guided core needle biopsy (USCNB) (40.7%, 22/54) vs. stereotactic-vacuum-assisted biopsy (S-VAB) (16.0%, 12/75) vs. USguided VAB (US-VAB) (7.7%, 1/13) (p = 0.002). Multivariable analysis showed that only US-CNB (odds ratio = 5.19, 95% confidence interval: 2.16–13.95, p < 0.001) was an independent predictor for pathologic upgrade. There was no upgrade when a sonographic mass was biopsied by US-VAB (n = 7) Conclusion The incidence of ADH was relatively low (1.7%) and the upgrade rate was 24.6%. Surgical excision should be considered because of the considerable upgrade rate, except in the case of US-VAB.
( Bong Jin Ko ),( Young Seok Kim ),( Sang Gyune Kim ),( Jung Hwan Park ),( Sae Hwan Lee ),( Soung Won Jeong ),( Jae Young Jang ),( Hong Soo Kim ),( Boo Sung Kim ),( Sun Mi Kim ),( Young Don Kim ),( Ga 대한간학회 2016 Gut and Liver Vol.10 No.5
Background/Aims: Deficiencies of 25-hydroxyvitamin D (25(OH)D) are prevalent in patients with chronic liver disease (CLD). Liver fibrosis is the main determinant of CLD prognosis. The present study was performed to evaluate the correlation between 25(OH)D levels and liver fibrosis as assessed by transient elastography (TE) in patients with compensated CLD. Methods: Serum 25(OH)D levels and liver stiffness were determined in a total of 207 patients who were subjected to the following exclusion criteria: patients with decompensated CLD; patients who had malignancies; patients who were taking medications; and patients who were pregnant. Results: The most common etiology was chronic hepatitis B (53.1%). Advanced liver fibrosis (defined by TE [≥9.5 kPa]) was present in 75 patients (36.2%). There was a significant correlation between 25(OH)D deficiency and liver stiffness. Based on the multivariate analysis, the following factors were independently associated with advanced liver fibrosis: 25(OH)D deficiency (odds ratio [OR], 3.46; p=0.004), diabetes mellitus (OR, 3.04; p=0.041), and fibrosis-4 index (OR, 2.01; p<0.001). Conclusions: Patients with compensated CLD exhibit a close correlation between vitamin D level and liver stiffness as assessed by TE. Vitamin D deficiency was independently associated with advanced liver fibrosis. (Gut Liver 2016;10:818-825)