셀 제조시스템에 있어서 비유사도를 이용한 기계셀과 부품그룹의 동시형성방법

윤창원,정병희,김민규 崇實大學校 生産技術硏究所 1994 論文集 Vol.24 No.-

The success of cell manufacturing applications in FMS rests on the effective cell formation to maintain the independent relations both between machine cells and between part families. This paper presents an integrated method for concurrent formation of cells and families with no E.E(Exceptional Element) in FMS with alternative routings. To determine the maximum number of cell and family with no E.E, mathematical conditions and theorems are derived. New concept of nonsimilarity is introduced for each machine and part based on machine-operation incidence matrix and part-operation incidence matrix. To concurrently form the cells and families, integer programming based mathematical models are developed. For the predetermined number of cell or family, model 1 is used to identify whether E.E exists or not. Model 2 forms cells and families considering only nonsimilarity. But model 3 can consider nonsimilarity and processing times. The proposed method is tested and proved using numerical examples.

해안 잠재 친수여가공간 개발대상지에 대한 사례연구

민병형,이정환,정지윤 동아대학교 해양자원연구소 2000 硏究論文集 Vol.13 No.1

A study will be exalted of live quality that to use of Sea Front for new digging and development in the conceal of Sea Front as used always for live space. This summarize shows the following result. 1.Busan of decide to befroe time-table to development that seven area selected in the conceal of Sea Front to position of the Young Do , SeuㆍSahagu. 2.This seven area withen , A exercise ground area of a Dong sam don-Young Do of the study to development forms. As the proposed first case and second case to aid first case to will be canvass for superior to aid of SeaㆍCure resort 3.This seven area withen, a excrise ground area of Dong sam dong-Young Do Gu the study to development forms As the proposed first case and second case and first case to will be canvass for superior to aid of SeaㆍCure resort 4.A exercise ground area Dong sam dong - Young Do to aid of SeaㆍCure resort that through SeaㆍCure culture to offer, we will be again the SeaㆍSight-seeing city to used the SeaㆍSight - seeing. 5.SeaㆍCure resort area to aid of in the development plans to very suit for used a place and space to disposition, plans to disposition of institute objects for odd used.

철근콘크리트 장방형 전단벽의 비선형 유한요소 해석

윤현도,한민기,김선우,박완신,양일승,한병찬 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.2

The major objective of the present study is to conduct parametric study and to propose a finite element analysis(FEA) technique of the reinforced concrete rectangular shear walls using ABAQUS under constant axial and monotonic lateral load. A FEA of the reinforced concrete walls are different to aspect ratio and a detailed finite element models are created to study the post-cracked mode of failure in plastic region of the walls. The proposed models account for the effect of material inelasticity, concrete cracking, and geometric nonlinearity. The prossed FEA model is verified by Lefas's benchmark data and validated through comparisons with experiment result of reinforced concrete shear walls. Finally, the study considered various parameters and compared with ACI 318-02 to confirm accuracy of this study: aspect ratio, axial force ratio, vertical and horizontal reinforcement ratio.

브라켓 부착을 위한 변형된 레이저 부식법

윤민성,이상민,양병호 대한치과교정학회 2010 대한치과교정학회지 Vol.40 No.2

전단결합강도를 강화하기 위해 레이저를 이용한 부식과 산을 이용한 부식의 비교 연구가 많이 진행되어왔다. 본 연구에서는 Er,Cr:YSGG laser와 전통적인 산부식법을 혼합한 방법의 전단결합강도의 변화에 대한 평가를 하고자 한다. 교정적인 목적으로 발치된 64개의 건전한 소구치를 이용하여 16개씩 4개의 군으로 나누었다. 첫 번째 군은 37% 인산을 15초 적용시키는 전통적인 부식 방법을 택하였고, 두 번째 군은 물방울레이저로 1.5 W로 10초간 부식시킨 후 전통적인 산부식 방법을 시행하였다. 세 번째 군은 두 번째 군과 같지만 산부식을 먼저 시행한 후 물방울레이저로 부식시켰다. 네 번째 군은 물방울레이저를 이용하여 1.5 W로 15초간 부식시켰다. 이후 전단결합강도의 측정 및 치아 표면의 특징 관찰, 그리고 접착제잔류지수를 평가하였다. 두 번째, 세 번째 군은 첫 번째, 네 번째 군에 대하여 전단결합강도가 높게 측정되었다. 하지만 두 가지 기법의 복합사용 순서를 달리한 두 번째, 세 번째 군 사이에는 통계적으로 유의한 차이가 나지 않았다. 기존 산부식을 이용한 브라켓 접착법보다 산부식과 Er,Cr:YSGG laser를 복합적으로 사용 시, 향상된 전단결합강도를 얻을 수 있다. Objective: Many studies have carried out research on comparisons between laser etching and conventional etching systems to investigate methods of reinforcing shear bond strength. The purposes of this study were to assess the efficiency of bonding with erbium, chromium doped: yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser etching combined with the conventional etching technique. Methods: Sixty-four sound premolars, extracted for orthodontic purposes, were randomly divided into 4 groups and treated in the following manner. First group, conventional etching of 37% phosphoric acid for 15 seconds (control); second group, 1.5 W laser etching for 10 seconds followed by conventional etching; third group, conventional etching followed by 1.5 W laser etching; fourth group, 1.5 W laser etching for 15 seconds only. We assessed the shear bond strength, the surface characteristics, and the adhesive remnant index scores between all groups. Results: Experimental groups showed higher shear bond strength than the control group. But no statistically significant differences were found between the second and third groups. Adhesive remnant scores were compared with the Kruskal-Wallis test, and no statistically significant differences were found between all groups. Conclusions: To obtain maximum shear bonding strength, a combined technique of Er,Cr:YSGG and 37% phosphoric acid is useful even though it may be inconvenient.

사과의 열과원인에 관한 조사연구

권병규,강영호,이우승,성민웅,이상윤,조화석 慶北大學校 生産技術硏究所 1970 生産技術 Vol.4 No.-

It is very important to eliminate the immense economic loss caused by cracking in apples through examining the causes of cracking and divising a possible method of prevention of it. Several investigators published their findings on the causes of the cracking of apples which develop on the skin of Ralls apples. However, no definite conclusions or established methods of prevention have been published to this date. Therefore, in this study the causes of the cracking of apples are examined through the use of several methods: (a) the histological and physiological, (b) the microelemental, and (c) the natural environmental. The results are as follows: 1). At the early stage of growth, the thicknesses of the cuticle, as well as of the subepidermis, were the same in Ralls apples without envelopes, Ralls with envelopes, and Jonathan. However. at maturity. the thicknesses differed in the following manner; Ralls apples without envelopes were thickest: Ralls envelopes were less thick than those without envelopes; while Jonathan apples were thinest. 2). Although in the Ralls without envelopes the epidermis is arranged in a brick wall like layer during maturity, in the middle of August the brick wall like epidermis begins to collapse and is surrounded by the cuticle. The process of cracking seems to start with the lenticle and the fruit spot. 3). The rate of cracking was slowed by application of a mixture of IAA and Bordeaux mixture solution, but cracking was not completely halted by this treatment. 4). The stem of a branch laden with apples was put into a solution containing Mn-54, and after absorption took place the distribution of Mn-54 was measured. The results of the measurements were as follows; the bark contained the most Mn-54; the leaves contained the second largest quantitiy; and the apples has the least. 5). The two orchards which were tested tended to have a low soil pH, and a high concentration of soil-solution Mn. 6). The soil with a high rate of cracking tended to have a high pH, which the soil with a low rate had a low pH. 7). In trees with a high rate of cracking, the amount of Mn in the leaves was equal to the amount in the stalk. However, in trees with a low rate of cracking, the amount of Mn in the leaves tended to be high compared with that found in the stalk. 8). The epidermis of the Ralls had a high Ca content than the epidermis of the Johnathan. 9). The epidermis of cracked apples tended to have a higher content of Ca, K,P, Cu and Fe than the epidermis of sound apples. 10). Amoug the apples tested, 11% cracked during the course of the year, with the cracking starting in the middle of Sept. 1969, This low percentage of cracking can be attributed to the small amount of rain during harvest time (late Sept. and October). The total of the added temperature during May, June, and July was 1962℃. 11). Cracking occurred more frequently in apples on the periphery of the tree, in well-colored apples, on the south side of the apples, and on the cheeks of the apples. These occurrances can perhaps be attributed to the amount of sunlight. 12). In the trees tested with newspaper envelops, cracking occurred in 1.9% of the apples with envelopes, and in 11.9% of the apples without envelopes. In the trees tested with Polysteron paper envelopes, cracking occurred in 2.5% of the apples with envelops, and 13.4% of the apples without envelopes. The apples with Polysteron paper envelopes were less infected by insects than the apples with newspaper envelopes. 13). Cracking occurred in 2.4% of the apples covered with vinyl, while in trees not covered with vinyl, 16.6% of the apples crack. The Artificial precipitation produced during harvest time increased the rate of cracking.

水耕裁培 토마토의 生育 및 果實發育에 미치는 窒素源의 影響

郭倫僖,閔炳訓,李政明 경희대학교 부설 식량자원개발연구소 1990 硏究論文集 Vol.11 No.-

Experiments was conducted to investigate the shoot growth and fruit development in two cultivars of tomato(Lycopersicum esculentum Mill cv. 'Kangyuk and Ruby') as influenced by the composition of NO_(3)-N and NH_(4)-N in hydroponic culture solution. When the nitrogen was supplied entirely with NH_(4)-N, root browning and foliage withering were initially observed and most plants in this plot were eventually killed. The best shoot growth was obtained from the hydroponic culture containing an equal amount of NO_(3)-N and NH_(4)-N. The 2 tested cultivars exhibited similar response even though they possessed very different growth characteristics. Mean fruit fresh weight of 'Kangyuk' and Ruby tomatoes was significantly higher in nutrient solution composed of 70% NO_(3)-N and 30% NH_(4)-N and the fruits also showed the best qualities. However, higher composition of NH_(4)-N resulted in the lower mean fruit fresh weight. Total fruit yield and the number of fruits harvested per plant were not influenced by the composition of NO_(3)-N and NH_(4)-N in the nutrient solution except in the plot supplied entirely with NH_(4)-N. The composition of nitrogen form in nutrient solution had little or no effect on the soluble solids content, juice acidity, and juice titratable acidity unless the nitrogen was supplied only with NH_(4)-N.

근관 전색재의 방사선 불투과성에 관한 비교연구

김태민,김서경,황인남,황윤찬,강병철,윤숙자,이재서,오원만 대한치과보존학회 2009 Restorative Dentistry & Endodontics Vol.34 No.1

This study was performed to assess the radiopacity of a variety of root canal sealers according to the Specification concerning root canal sealers. Ten materials including Tubli-Seal™, Kerr Pulp Canal Sealer™, AH 26^(R), AH plus^(R), AH plus jet™, Ad seal™, Sealapex™, NOGENOU™, ZOB seal™, Epiphany™, and dentin were evaluated in this study. In the first part. densitometric reading of an each step of aluminum step wedge on occlusal film was performed at different voltage and exposure time. In the second part, ten specimens were radiographed simultaneously with an aluminum step wedges on the occlusal films under decided condition. The mean radiographic density values of the materials were transformed into radiopacity expressed equivalent thickness of aluminum (mm Al). The following results were obtained 1 Among the various conditions, the appropriate voltage and exposure time that meet the requirement density was 60 kVp at 0.2 s 2 All of the materials had greater radiopacity than 3 mm Al requirement of ANSI/ADA specification No. 57 (2000) and ISO No. 6876 (2001) standards. 3 The radiopacity of materials increased as thickness of materials increased. 4 The mm Al value of each specimen at 1mm in thickness has a significant difference in the statistics. It suggests that root canal sealers have a sufficient radiopacity that meet the requirement. 다양한 근관전색제는 방사선 사진상 주위 해부학적 구조와 구별될 만한 방사선 불투과성을 나타내야 한다 따라서 이런 물질들이 근관에 충전될 때의 방사선 불투과성 정도를 평가해야 할 필요성이 대두되고 있다. 본 실험에서는 다양한 근관전색제들의 방사선 불투과성을 평가하고자, 방사선 노출조건에 따른 aluminium step wedge에 대한 광학 밀도를 알아보고, 그 중 적절한 노출조건을 선택하여 수종의 근관 전색재의 방사선 불투과성 정도를 알루미늄 두께로 환산하여 비교해 보고자 한다. 방사선 불투과성의 기준을 위해 11개의 step으로 구성된 aluminum step wedge을 사용하여, 60kVP, 70kVp관전압 상태에서 각각 0.2, 0.3, 0.4초 그리고 0.2, 0.3, 0.33초의 꼭 노출시간으로 교합필름상에서 방사선 촬영후 적절한 노출 조건을 구하였다. 직경 5mm 각각의 두께 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 mm인 10종 (Tubli-Seal™, Kerr pulp Canal Sealer™, AH26^(R), AHplus^(R), AH plus jet starter kit™, Ad seal™, Sealapex™, Nogenol root canal sealer™, ZOB seal™, Epiphany™)의 근관전색재 시편을 각 재료와 두께당 10개씩 제작한 후, 동일한 두께의 상아질 시편, aluminum step wedge와 함께 정해진 노출시간에 따라 방사선 촬영을 하였다. 모든 필름은 자동현상기로 현상하였다. 시편의 방사선 흑화도를 densitometer로 5회 반복 측정 후, 평균값을 구하여 알루미눔 두께로 환산하였다.얻어진 정보를 분석하여 다음의 결과를 얻었다. 1 관전압 60 kVp에서 노출시간 0.2, 0.3, 0.4초, 70 kVp에서 0.2, 0.3, 0.33초로 변화를 주어 방사선 촬영을 하였을 때 흑화도가 ISO No. 6876 규격에 가장 적합한 것은 60 kVP, 0.2초 일 경우였다. 2 측정된 근관 전색제의 방사선 불투과성은 2.29 mm Al (N0GEN0L)로부터 13.69 mm Al (AH Plus jet)까지 다양하게 나타났으나, 모두 ANSI/ADA specification (2000) 또는 ISO No. 6876 (2001) 규격이 제시한 최소한 3mm Al 이상의 방사선 불투과성을 지녀야 한다는 기준에 적합하였다. 3 재료의 두께가 증가할수록 방사선 불투과성은 증가하지만, 정비례하지는 않았다. 4 각 실험재료의 1 mm 두께의 시편에 대한 mm Al값들은 통계적으로 유의한 차이가 있었다. 이상의 결과는 본 실험에 사용된 수종의 근관 전색재는 모든 규격에 적합한 방사선 불투과성을 가지고 있음을 시사한다.

심근 허혈-재관류 백서 모델에서 mitogen-activated protein kinase 활성화에 대한 α-lipoic acid의 효과

김연경,박은미,최준호,윤경호,유남진,이은미,김남호,정진원,김민선,박병림,오석규 圓光大學校 醫科學硏究所 2006 圓光醫科學 Vol.21 No.1

Gullian Barre Syndrome 患者 1例에 대한 症例報告

임승민,안정조,최영,조현경,김민상,유병찬,오병렬,김윤식,설인찬 대전대학교 한방병원 2002 惠和醫學 Vol.11 No.1

Gullian Barre Syndrome is an acute symmetric polyradiculoneuropathy that typically presents as a progressive flaccid paralysis. The pathology is believed to be caused by both cellular and humoral immune processes The possibility of death is 3-5% and About 20% of patients require mechanical ventilaton. Recently We have experienced a patient who had suspected Gullian Barre Syndrome for 60days, his condition weakness and pain was impoved through the herb and acupucture Therefore I reported it for the treatment.

ABAQUS를 이용한 휨벽체의 비선형 유한요소 해석기법

한민기,박완신,한병찬,황선경,최창식,윤현도 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

The finite element method(FEM) models were developed for the reinforced concrete flexural walls and analysed under constant axial and monotonic lateral load using ABAQUS. The major objective of the present study is to determine if the ABAQUS finite element program can be used to accurately model the post-cracked mode of failure in plastic regions of walls, and, if so, to develop practical failure criteria in the plastic range of the material response. The research comprises constitutive models to represent behavior of the materials that compose a wall on the basis of experimental data, development of techniques that are appropriate for analysis of reinforced concrete structures, verification, and calibration of the global model for reinforced concrete walls of increasing complexity. The proposed FEA technique is verified by Lefas's benchmark data. Results from the analyses of these FEM models offers significant insight into the flexural behavior of benchmark data.