건축공사 마감자재 조달 프로세스 개선 방안

김형만,이희복,박찬식 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1

In finishing stage, several works are performs at the same time as well as the most construction materials are input in construction site, thus these need to be proper and efficient procurement of finishing materials. The purpose of this scheme is to improve the procurement process of finishing materials by finding several problems in procurement process of building construction process. As a result. the study proposed procurement process suitable for domestic construction sites. Major effects of proposed procurement process are as follows: the simplification and coordination of procurement business, organization of cooperative work system with each party in procurement, the information-oriented procurement process of materials. Improvement proposal proposed in this study got a base to acquire the accuracy in procument process and concept of ]IT. These proposals can make procurement process efficient and reduce lead time od conducting procurement business and solve problems of construction delays caused by finishing works.

숙녀복(淑女服) 재킷 제조공정(製造工程) 실태(實態) 연구(硏究)

심재희 ( Jae Hee Shim ),손희순 ( Hee Soon Sohn ) 한국패션비즈니스학회 2002 패션 비즈니스 Vol.6 No.1

The purpose of this study was to present the plan for activation and rationalization of production of ladies` jacket and provide basic materials for improvement of the development of technologies in relation to the productivity improvement of ladies` jacket and the achievement of high quality product. For this purpose, this study attempted to investigate the present situation of jacket manufacturing process. The data is related with local ladies` jacket manufacturing companies in Seoul snd Kyonggi area. The results of this study are as follows. 1. 87.8% of the business firms responded that they acquired the productive process of jacket based on their own knowhow and 80.5% was aware of the need for the analysis of each process. The highest proportion of the business firms(65.9%) pointed out that the advantage of process analysis was the alleviation of the production time. 2. The jacket manufacturing process was made up of 4 stages such as the process of frontal/rear plate → the process of accessories → the process of completion → the process of finishing in a broad sense but composed of a total of 19 stages in detail. 3. Attachment of the sleeves(73.2), attachment of the collar(41.5%) and the formation of the overall silhouette(22.0%) were raised as the challenge in manufacturing ladies` jacket. 4. Most of the sewing business firms made use of the method of completing the collar and then stitching the outer material and the inner collar, and the line of the bodice and the outer collar as the method of stitching the tailored collar. and many of them used the method of completing the collar and then inserting it between the line of the bodice and the outer material and stitching it as the method of stitching the stand collar. They had a preference for the method of completing the sleeve and connecting it to the bodice as the method of stitching the sleeve. and used the method of treating the margin to seam of semi-lined and unlined jacket by treating it with the bias tape.

Design of continuity processes of electrochemical finishing and grinding following turning

P. S. Pa 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.11

A newly designed finishing process utilizing an effective electrode and a grinding tool to execute the continuous electrochemical finishing and grinding processes following turning is described in this paper. The proposed process can be used for a variety of turning operations. Electrochemical finishing and grinding can be performed following the finishing process on the same machine by using a simple attachment. The factors affecting electrochemical finishing, grinding performance, and electrochemical finishing are discussed. The electrode was tested with both continuous and pulsed direct current. A higher work piece rotational speed produced a better finish. Changing the electrode design from a semicircle to a wedge form with a small end radius caused the electrolytic products and heat to dissipate more rapidly and provided the best finishing. Pulsed direct current finishing was slightly better than using continuous direct current finishing. However, the use of pulsed current would increase machining time and cost.

자유곡면의 정압연마에 관한 연구

고봉수(Bong-Su Ko),조종래(Jong-Rae Cho),정윤교(Yoon-Gyo Jung) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.10

The finishing process of die requires the processing technique of a height efficiency and precision. Because the precision of die gives the quality of goods the influence directly. However a finishing process of die depends on the experience of expert and has been composed of the manual. Research about the automation of a finishing process which uses the construction machine have been processed. By the way, it is difficult to do finishing automatically with machine at parts which is hard to cut, so finishing process is still worked by the experts. The hydro-static polishing device employs the hydro-static axis and is able to polish the structure of complex picture under the constant pressure. Besides, inexperienced persons can easily produce the tool path with HMI technique which is mixed teaching of the robot and NC numerical control. The polishing is a process finely cut workpiece by relative motion of abrasive grain which is positioned between tool and workpiece. In the hydro-static polishing, polishing characteristic needs to be considered by relative motion of abrasive grain. Because the surface quality of workpiece depends on polishing pattern which relates to motion of abrasive grain. In this paper, in order to polish precision sculptured surface, polishing characteristic is estimated by polishing conditions which are size of abrasive, material of tools, and polishing patterns.

자유곡면의 정압연마에 관한 연구

고봉수(Bong-Su Ko),조종래(Jong-Rae Cho),정윤교(Yoon-Gyo Jung) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-

The finishing process of die requires the processing technique of a height efficiency and precision. Because the precision of die gives the quality of goods the influence directly. However a finishing process of die depends on the experience of expert and has been composed of the manual. Research about the automation of a finishing process which uses the construction machine have been processed. By the way, it is difficult to do finishing automatically with machine at parts which is hard to cut, so finishing process is still worked by the experts. The hydro-static polishing device employs the hydro-static axis and is able to polish the structure of complex picture under the constant pressure. Besides, inexperienced persons can easily produce the tool path with HMI technique which is mixed teaching of the robot and NC numerical control. The polishing is a process finely cut workpiece by relative motion of abrasive grain which is positioned between tool and workpiece. In the hydro-static polishing, polishing characteristic needs to be considered by relative motion of abrasive grain. Because the surface quality of workpiece depends on polishing pattern which relates to motion of abrasive grain. In this paper, in order to polish precision sculptured surface, polishing characteristic is estimated by polishing conditions which are size of abrasive, material of tools, and polishing patterns.

Effects of Feeding and Processing Methods of Diets on Performance, Morphological Changes in the Small Intestine and Nutrient Digestibility in Growing-Finishing Pigs

Yang, J.S.,Jung, H.J.,Xuan, Z.N.,Kim, J.H.,Kim, D.S.,Chae, B.J.,Han, In K. Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.10

These experiments were conducted to investigate the effects of different feeding and processing methods of diets on performance, morphological changes in the small intestine and nutrient digestibility of growing-finishing pigs. One-hundred fifty growing pigs ($Yorkshire{\times}Landrace{\times}Duroc$; initial body weight of $23.33{\pm}0.75kg$) and one-hundred twenty finishing pigs ($Yorkshire{\times}Landrace{\times}Duroc$; initial body weight of $59.22{\pm}0.56kg$) were used in Exp. 1 and Exp. 2, respectively. Pigs were grouped on the basis of body weight and gender, and randomly allotted into 6 different treatments with 5 replications in each treatment in a $2{\times}3$ factorial arrangement. Treatments were 1) dry feeding with a mash diet (DM), 2) dry feeding with a pelleted diet (DP), 3) dry feeding with an expanded crumble diet (DEC), 4) dry/wet feeding with a mash diet (WM), 5) dry/wet feeding with a pelleted diet (WP), and 6) dry/wet feeding with an expanded crumble diet (WEC). In Exp. 1 (growing phase), there was no significant difference in average daily gain (ADG) and average daily feed intake (ADFI) among treatments during the entire experimental period, but feed conversion ratio (FCR) was significantly (p<0.05) improved in pigs fed pelleted diets regardless of feeding method. FCR was best in pigs fed a DP diet and worst in pigs fed a WM diet. Pigs fed a pelleted diet showed a 6.2% or 4.0% improvement in FCR compared with those fed a mash diet or an expanded crumble diet. Water disappearance was not significantly affected by dry/wet feeding or feed processing. Significant differences in villus height were not found among treatments, but villus height tended to be improved by dry/wet feeding. Dry/wet feeding or feed processing did not affect crypt depth. Digestibilities of calcium and phosphorus were significantly (p<0.05) improved in pigs fed an expanded crumble diet compared with pigs fed mash diets. Especially, pigs fed a WEC diet digested 8.1% more P than those fed a DM diet. Feed cost per kg weight gain (FCG) tended to be increased by dry/wet feeding rather than dry feeding. In Exp. 2 (finishing phase), ADG and ADFI were not significantly different among treatments, but a significant difference in FCR was found among feed processing forms. The best FCR was obtained in pigs fed a pelleted diet. Pigs fed a DP diet showed a 11.3% improvement compared with those fed a DEC diet. Water disappearance was significantly (p=0.0408) decreased by feeding the mash diet. However, water disappearance was not affected by dry/wet feeding during the finishing period. The villus height and crypt depth were not significantly different among treatments. However, crypt depth tended to be decreased by dry/wet feeding at the mid part of the small intestine. Fat digestibility was improved by dry feeding rather than dry/wet feeding, and was improved by 4.8% by feeding pellet diets compared with expanded crumble diets. Except for carcass grade, carcass characteristics were not significantly (p<0.05) different among treatments. Carcass grade was the best in pigs fed a WP diet. Feed cost per kg weight gain (FCG) was significantly decreased in pigs fed a pelleted diet compared with those fed an expanded crumble diet, and tended to be decreased by dry/wet feeding. In conclusion, these studies suggest that feeding the pelleted diet to growing-finishing pigs can be beneficial in terms of FCR and production cost. Dry/wet feeding can be helpful for the maintenance of villus height, but may not be reflected in improved growth performance or reduction of production costs.

Tribological Properties of a Magnetorheological (MR) Fluid in a Finishing Process

SEOK, JONGWON,LEE, SEONG OH,JANG, KYUNG-IN,MIN, BYUNG-KWON,LEE, SANG JO Taylor Francis 2009 Tribology transactions Vol.52 No.4

<P> This article examines the tribological properties of a magnetorheological (MR) fluid in a finishing process. The MR fluid under investigation contains about 85 wt% of micro-sized carbonyl iron (CI) particles and about 15 wt% of water and surfactant(s) compound. A semi-empirical material removal model is proposed for the description of the tribological behavior of the MR fluid in the finishing process by considering both the solid- and fluid-like characteristics of the fluid in a magnetic field. Additionally, Archard's theory and Amonton's law of friction are applied to the model, which is completed by experimental efforts to identify the relationship between the effective friction coefficient and the ratio of the interfacial particle velocity to the imposed pressure on the workpiece surface. It turns out that the effective friction coefficient has a linear relationship with this ratio. The validity of the proposed model is supported through material removal rate measurements. It is also shown that the proposed model is substantially different from the conventional Preston equation in that the material removal rate is not only a function of the product of the applied normal pressure and relative velocity, but it also strongly depends on the square of the relative velocity.</P>

자기연마기술을 이용한 고속절삭공구의 성능향상에 관한 연구 : 고속절삭공구의 성능평가를 중심으로

조종래(J. R. Cho),양순철(S. C. Yang),정윤교(Y. G. Jung) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월

In high speed cutting process, due to the friction between the tool and workpiece, a temperature rise of contacting part is serious. It need to develop cutting tool for overcoming such a poor condition. So now, some studies, the optimization of tool shapes, the fine grains of tool material, multi-layer coating of tools are processing. If mirror finishing on the tool is processed, there is advantage of relation between chip and tool, because of less friction, and also tool"s life would be increased. As a result mirror like finishing is expected efficient enhancement of tool. Generally, it is too difficult to process by a general way for tools of complex shapes, it is required a new method to process such complex shape tools. The magnetic fluid polishing technique can polish the workpiece of complex shape, because the polishing method which polishes as compress the workpiece by the magnetism abrasives to arrange to the linear according to the line of magnetic force. In this paper, We polished the surface of the high speed cutting tool using the magnetic fluid polishing technique, to enhance the performance of the high speed cutting tool.

비대칭 형상제품의 단조공정에 관한 연구

정경빈(K. B. Jung),김현수(H. S. Kim),최영순(Y. S. Choi),김용조(Y. J. Kim) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월

A brake spider in an irregular shape, which is used as a part in the braking system of a vehicle like a big truck and a trailer, is subjected to a large torque and hence requires both strength and endurance over the brake heat. Manufacture of this product in practice is generally composed of hot forging processes and machining. At the present study, two or more processes were considered for the hot forging. With an initial circular billet, blocker and finisher processes were analyzed using the rigid-plastic finite element method and also in addition to the preforming process. Proper forging processes to manufacture an irregular product without forging defects, which are preforming, blocker and finisher, were discussed and commented upon.

건축공사 마감공기 단축을 위한 택트공정관리 프로세스 모델

김영재(Kim Young-Jae),한주연(Han Ju-Yeon),신동우(Shin Dong-Woo),김경래(Kim Kyung-Rai),김창덕(Kim Chang-Deok),서상욱(Seo Sang-Wook) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.1

Besides cost and quality, time is an important management point in the construction projects. It may be considered a competitive power as well as a cost reduction effect that a contractor shortens as possible the construction duration with keeping the requirement. But in case of investigation into the actual data of construction projects, it is especially highlighted that finishing work duration of domestic construction projects is much longer than that of in other advanced construction industry. Through reviewing the existing literature related to the schedule management and performing the questionnaire survey and the expert interview, this study proposes a process model to manage the finishing work of building construction effectively and also to reduce the required duration of the finishing work. The model consists of three steps. The first step is a basic planning process, the second step is a detail planning process, and the last step is a operation and maintenance process.