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문치웅,김장형 濟州大學校 産業技術硏究所 1996 산업기술연구소논문집 Vol.7 No.1
Process planning is the task of generating a plan for transforming raw material to finished part according to CAD informations and manufacturing prcatice. The task of process planning includes the determination of the sequence of a part. machines, and tools. In this paper. we proposed a flexible process planning model for the process sequence and machines selection on process planning problems. Process sequencing should consider a set of constraints imposed by the design information and manufacturing practice. Determination of an optimal machining process sequencing for complex parts results in the need to consider a large solution space. This paper presents an improved method for process sequences and machines selection that permits the efficient application of genetic algorithms. To apply the genetic algorithm to the process sequencing and machines selection problem, the representation, selection, and genetic operators are studied, and then modified genetic algorithm for optimal machining process sequencing and machine tools selection is proposed.
Evolutionary Programming for Designing Independent Cells
문치웅,이유경,김장형 濟州大學校工科大學産業技術硏究所 1997 尖端技術硏究所論文集 Vol.8 No.1
본 본문에서는 독립셀 설계를 하나의 0-1 Integer Programming 모델이 개발되었다. 모델은 대안적인 공정계획과 중복설계, 공정시간, 그리고 가용능력등과 같은 현실적인 관련 파라메터들을 고려하여 설계되었다. 그리고 이 모델의 해결을 위해 유전알고리즘에 기초한 진화적 해결방법을 제시하였다. 이 방법은 기존의 방법에 비하여 빠른 시간내에 최적해를 구하였으며, 대규모의 문제에 대하여 효율적으로 적용 가능하였다. In this paper, an evolutionary programming approach is proposed for the designing independent cells in cellular manufacturing with alternative process plans and machine duplication consideration. Several manufacturing parameters such as production volume, machine capacity, processing time, number of cells and cell size are considered in the process. The model is formulated as a 0-1 integer programming and solved using genetic algorithm. It determines the machine cells, part families and process plan for each part simultaneously.
Evolutionary Programming for Designing Independent Cells
문치웅,김장형,이유경 濟州大學校 産業技術硏究所 1997 산업기술연구소논문집 Vol.8 No.1
In this paper, an evolutionary programming approach is proposed for the designing independent cells in cellular manufacturing with alternative process plans and machine duplication consideration. Several manufacturing parameters such as production volume, machine capacity, processing time, number of cells and cell size are considered in the process. The model is formulated as a 0-1 integer programming and solved using genetic algorithm. It determines the machine cells, part families and process plan for each part simultaneously.
자동화 생산 시스템에서의 생산셀 설계와 셀 배치계획을 위한 통합모델
문치웅,박명규 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
This paper is concerned with problem of manufacturing cell design and cell layout planning in automated manufacturing system design. To solve this problem the proposed model incorporates relevant manufacturing factors such as workload and cell size. Based on those information, to form the manufacturing cell, correlation similarity coefficient(CSC) among machines are calculated and a pair of machines that has the highest value of CSC is assigned to a machine cell. Repeat the above steps until the adequate manufacturing cells are obtained. Because the obtained cellular structure for the manufacturing system design in the previous stage does not give the layout of the cells on the site directly, it is important to determine the adequate cell layout. For the cell layout planning, the adjacent relationship among cells are determined on the basis of the degree of interference among cells which is evaluated by the volume of the intercel1ular movements among cells. The relationship obtained by this procedure determines the configuration of the cell layout. Finally, a system is improved to increase the efficiency of a proposed model. The proposed model and system are illustrated by numerical example.
문치웅,김장형 濟州大學校工科大學産業技術硏究所 1996 尖端技術硏究所論文集 Vol.7 No.1
Process planning is the task of generating a plan for transforming raw material to finished part according to CAD informations and manufacturing practice. The task of process planning includes the determination of the sequence of a part, machines, and tools. In this paper, we proposed a flexible process planning model for the process sequence and machines selection on process planning problems. Process sequencing should consider a set of constraints imposed by the design information and manufacturing practice. Determination of an optimal machining process sequencing for complex parts results in the need to consider a large solution space. This paper presents an improved method for process sequences and machines selection that permits the efficient application of genetic algorithms. To apply the genetic algorithm to the process sequencing and machines selection problem, the representation, selection, and genetic operators are studied, and then modified genetic algorithm for optimal machining process sequencing and machine tools selection is proposed.
원치문 한라대학교 2007 論文集 Vol.10 No.-
This paper presents the results of a test program for flexural strengthening characteristics of continuous unidirectional flexible carbon-fiber sheets(CFS) bonded or/and developed to reinforced concrete(RC) beams. A total of three 300 mm × 500 mm × 6,400 mm concrete beams were tested. Beam without any strengthening, beam bonded with CFS, and beam bonded and developed with CFS using development device were studied to determine their effects on flexural strength of the beams. From the tests, it was found that the strength increases with the development of sheets at development device. Among the three beams, beam bonded and developed with CFS using development device provided the most effective strengthening for concrete beam. Beam strengthened using this scheme showed 97.8% increase in flexural capacity as compared to the control beam without any strengthening.
金智文,權琦遠,兪在殷 忠南大學校 環境問題硏究所 1986 環境硏究 Vol.4 No.2
Some ecological physiognomies related to the distribution of Quercus serrata and Q. mongolica as well as Carpinus laxiflora were investigated in the two valleys of Hwaumsa-Nogodan and Piagol-Yimgulryong in Mt. Jiri. For the purpose of the community analysis of the tree species, ten subplots of 10m x 10m quadrat were sampled in each of main plots partitioned into 4 or 5 sections along the altitude by valley. Even if being a little different by plot or by valley studied, the leading dominant tree species were analyzed to be C. laxiflora, Q. serrata and Q. mongolica, and the sub-dominant tree species to be Styrax japonica, S. obassia, Stewartia koreana and Acer pseudo-sieboldianum v. koreanum, etc. over all the area studied. But other Quercus species and Pinus densiflora seemed to be minor species in all the area ezcept for some quadrats of lower parts of the valleys. The importance values of C. laxiflora were estimated to be the highest on the altitude of about 1,000m and to be the lowest on the upper ridge and top in H-N valley, but to be the highest on the foot stand in P-Y valley. The values of Q. serrata have changed irregularly along the altitude in H-N valley and seemed to be a little high on the mid parts of the slope in P-Y valley. But the values of Q. mongolica have increased constantly with the ascent of altitude and so have exhibited the highest on the ridges exclusively in the two valleys, All the relative values have varied extensively among the subplots in the same plot, and the C.V. values calculated by plot have also exhibited a great deal of differences of 32-191% in R.D., 38-229% in R.C., and 38-206% in I.V. by species and by altitude. The relative values of R.D., R.F., R.C., and I.V. following the ecological successional stages based on gradient of altitude, have been fluctuated with similar patterns in C. laxiflora and Q. serrata, but with inverse patterns in the former two species and Q. mongolica. The dispersion patterns of the three species based on Morisita's index seemed to be random or contagious dispersions having the indices of 1.001-3.333 over all the plots studied. The relative densities following the size class of D.B.H. were estimated to be a little high in the mid of the size classes over all the plots and valleys in Q. serrata, but to be significantly high in the small of the size class in Q. mongolica. The four kinds of tree form indices have changed irregularly by kind of index, by species, and by altitude.
10MgO-10Fe_2O_3-30Na_2O-5OSiO_2 유리의 Mo¨ssbauer 효과 연구
홍치유,박관호,백승도,문찬호,조수열 동국대학교 1987 論文集 Vol.26 No.-
The Mo¨ssbauer effect studies of the quenched glass and heat-treated glasses were performed. The Debye and Einstien temperatures of the quenched glass, determined using the center shift and kinetic temperature, are 540K and 430K respectively. The X-ray diffraction pattern showed that the heat-treated glasses were crystallized. Form the isomer shift of the heat-treated glasses, it was concluded that the Fe^(3+) ion is predominantly octahedrally coordinated.
간호실무에서 신봉이론(Espoused theories)에 대한 탐색적 연구
서문자,김혜숙,이은희,박영숙,조경숙,강현숙,임난영,김주현,이소우,조복희,이명하,지성애,하양숙,손영희,권성복,김희진,추진아 성인간호학회 2001 성인간호학회지 Vol.13 No.1
As a nursing practice involves nurses' actions in a specific context of health care, this study has focused on exploring the espoused theories in nursing practice within the action science perspectives, Espoused theories are the belief, principles, and rationale expressed by the practitioner as guiding her/his actions in a situation of practice. The data were analysed qualitatively and 25 elements of espoused theories of nursing action were identified and clustered into 6 categories. The 25 elements of espoused theories are as follows: The clinical nurse worked in wholistic and individual nursing, focussed on the patient's needed, comfort and supportive nursing (5 theories of nursing goal) ; excellent skills, knowledge based, assessment and data collection, explaining, educating or a scientific basis(6 theories of nursing intervention): advocacy, value oriented, treatment, account- ability and commitment(4 theories of nursing ethics) ; human respect. partnership, trust(3 theories of patient-nurse relationship) : knowledgable, accumulated clinical experiences and personally lived experiences. positive perspectives(4 theories of nurse), role of intervention. rewarding peer relationship(3 theories of situations) The above mentioned espoused theories are similar to that of nursing textbooks which students learned through basic nursing education and almost the same as the Acts ofa Nurse in Korean. However, we are doubtful whether nurses actually do as they think. Therefore. it is recommended to review the theories-in-use in order to and any discrepancies between the espoused theories and the reality of nursing actions
안치영,이경종,박재범,장재연,김문종 大韓産業醫學會 2001 대한직업환경의학회지 Vol.13 No.1
목 적 : 조선소에서 만성적 유기용제 노출과 간기능과의 관련성을 규명하고자 하였다. 방 법 : 한 대형 조선소에서 도장작업 부서의 근로자 461명과 유기용제 노출이 없는 대조군 125명, 총586명의 남성 근로자를 대상으로 유기용제 생체누적노출량과 간기능검사 지표와의 관련성을 단면적 연구를 통하여 수행하였다. 일반적 특성, 직업적 특성, 간기능 검사와 작업환경 평가 및 생물학적 모니터링을 이용하여 자료와 변수들을 수집하여 이변량 분석과 로지스틱 회귀분석을 시행하였다. 간 기능을 정상과 비정상으로 구분하여 종속변수로 삼고 생물학적 모니터링을 근간으로 하여 생체 누적 노출량(CE)을 독립변수로 하여 로지스틱 회귀 분석을 시행하였다. 결 과 : 다중 로지스틱 회귀분석을 한 결과SGOT(>351ua), SGPT(>401U/L), γ-GTP(>631U/L)에 대해 유기용제 생체누적노출량(CE)은 각각 1.10(95 %Cl, 1.02~l.20), 1.10(95 %Cl,1.Ol~l.19), 1.10(95% Cl; 1.Ol~l.19)의 비차비를 보였다. 결 론 : 그러므로 혼합 유기용제에의 누적폭로는B형 간염 항원이 음성인 남성근로자들에 있어 SGOT, SGPT, γ-GTP 등의 간기능검사의 비정상결과(검사치의 증가)에 유의한 관련성이 있는 것으로 판단된다. Objectives : This study was conducted to evaluate the association of cumulative exposure to organic solvent with liver function. Methods : We conducted a cross sectional study. 461 male workers who Perform painting job at a shipyard and use organic solvents routinely and 125 workers of the same shipyard who never have been exposed to organic solvents were studied. All subjects who were confirmed not having HBsAg surveyed their age, BMI (body mass index), alcohol drinking and smoking history, and examined liver function test (SGOT, SGPT, γ-GTP, Total protein, albumin, total bilirubin, direct bilirubin) . The amount of cumulative exposure (CE) to mixed organic solvents were measured by biological monitoring method using their metabolites in urine. Results : The CE was observed as a significant variable with logistic regression analysis on abnormality of SGOT(>35IU/L) , SGPT(>40IU/L) and γ-GTP(>63IU/L), their odds ratio were 1.10 (95 %CI, 1.02-1.20), 1.10 (95 %CI, 1.01-1.19), and 1.10 (95 %CI, 1.01-1.19) each. Conclusions : Therefore we suggest that the cumulative exposure to mixed organic solvents might be a significant variable on abnormal liver function indices (SGOT, SGPT, γ-GTP) in male shipyard workers.