마이크로웨이브 레인지 재가열 후 최적 특성을 갖는 쌀죽 제조조건

박혜영,김현주,심은영,곽지은,천아름,조영제,우관식,김미정,Park, Hye-Young,Kim, Hyun-Joo,Sim, Eun-Yeong,Kwak, Jieun,Chun, Areum,Jo, Youngje,Woo, Koan Sik,Kim, Mi Jung 한국식품영양학회 2020 韓國食品營養學會誌 Vol.33 No.4

The purpose of this study was to derive the conditions for manufacturing rice porridge with optimum properties after reheating. The characteristics of rice porridge according to the soaking time, water addition rate, heating temperature, heating time, and cooling conditions were compared using the 'Samkwang' cultivar. In Step I, as the heating temperature increased, the weight change decreased and the viscosity increased, and the temperature known as the main factor of the gelatinization also appeared to affect the viscosity increase. In Step II, the viscosity and the texture properties was not significantly different as the soaking time was reduced, and 10 minutes was suitable because of due to the shortening effect of the total process time. In Step III, the residual heat was lowered by cooling after the rice porridge production, so the viscosity could be greatly reduced. Also, it was confirmed that the water addition rate of 900% and the heating temperature of 15 minutes were optimal manufacturing conditions. The next study will investigate the porridge processability of rice cultivars using these results.

Study on the Reduction of Food Fabrication Time in Additive Manufacturing Process Using Dual Nozzle

백승엽(Seung Yeop Baik),박주호(Ju Ho Park),강상인(Sang In Kang),이인환(In Hwan Lee) Korean Society for Precision Engineering 2021 한국정밀공학회지 Vol.38 No.11

Additive manufacturing requires a relatively long time to fabricate complex three-dimensional (3D) structures or parts with more than one material. For additive manufacturing processes, production time and precision vary depending on the fabrication conditions. In this study, we developed a food additive manufacturing process of the material extrusion method type using a dual nozzle. In addition, we observed the change in the cross-sectional shape of the discharged food line according to each fabrication condition. By using a dual nozzle, the structure was fabricated under conditions of relatively high precision for the outer wall and relatively low precision for the infill, thereby shortening the production time. Through this process, it can be expected that the production time will be shortened in the food field, while the appearance will be of good quality.

공동주택 철근공사의 실태조사에 관한 연구

이택운 한국건축시공학회 2008 한국건축시공학회지 Vol.8 No.2

The rebar work is very related to the safety and durability of the building. Recently, the rebar work is produced some serious problems due to the lack of skillful crafts-man and the rising cost of rebar materials. Many papers have dealt with the rebar work of the manufacturing system in plants with a view to improvement those problems. But, the research on the rebar work of the manufacturing system in field is in a insignificant condition. This study presents the following improvement schemes as a result. First, the education strengthening for evaluation on practical affairs, second, the reinforcement of drawing & management in shop drawing and finally the simplification of apartment rebar work in slabAlso, this paper aims at advancing apartment rebar work by the actual condition survey in slab work. The further research will be needed about the whole structure parts such as foundation, wall, girder and rebar truss-deck plate as one of the improvement methods. The rebar work is very related to the safety and durability of the building. Recently, the rebar work is produced some serious problems due to the lack of skillful crafts-man and the rising cost of rebar materials. Many papers have dealt with the rebar work of the manufacturing system in plants with a view to improvement those problems. But, the research on the rebar work of the manufacturing system in field is in a insignificant condition. This study presents the following improvement schemes as a result. First, the education strengthening for evaluation on practical affairs, second, the reinforcement of drawing & management in shop drawing and finally the simplification of apartment rebar work in slabAlso, this paper aims at advancing apartment rebar work by the actual condition survey in slab work. The further research will be needed about the whole structure parts such as foundation, wall, girder and rebar truss-deck plate as one of the improvement methods.

자동차용 루프 패널의 설계 및 해석에 관한 연구

이규배 ( Kyu-bae Lee ) 한국고등직업교육학회 2001 한국고등직업교육학회논문집 Vol.2 No.2

The development of computer hardware and software has made active research attempted in the motor field. From the design of motors to the manufacture of dies, it is attempted variously. Here, when we examine the computer applied example of dies manufacture. Specially, to evaluate formablity of stamping dies, simulation by computer is being made up. This is what we called “Virtual Manufacturing Method” by computer. Skilled shop workers can make a complete dies after spending much time and money. However, actual stamping process with virtual manufacturing method by computer can make the visualization of the result of simulation and verify strain conduct of the goods. Recently, at the advanced motor companies, the applicable of virtual manufacturing method to be moved up. This study is the area that must be researched at the point of time when is not reduced personnel and material expenses being consumed at the current manufacturing method. Positive attempt of the kind of technique is made up and have to be reduced the expense and time for manufacturing to the most.

Properties of Bubble used in Concrete ac cording to Change in Manufacturing Condition

Byoungil Kim 대한건축학회 2024 Architectural research Vol.26 No.1

This study is a research investigation into the properties of bubbles that affect the characteristics of foamed concrete during its production. The study examined the properties of bubbles based on the manufacturing conditions. To investigate these properties, the selected experimental factors included bead size, the length/diameter ratio of the bubblegenerating tube, and compressed air. The experimental design used a design of experiments, and the test results were analyzed using analysis of variance. The foaming agent used to generate bubbles was AES (Alcohol Ethoxy Sulfate), and the method employed for bubble manufacture was the pre-foaming method. In the test results, a significant factor affecting the foaming rate of bubbles was the bead size; the highest foaming rate was observed when using 2mm beads. Bead size also primarily influenced the volume change of the aqueous solution, while other factors did not affect the foaming rate and volume change. None of the factors affected the change in bubble size, but compressed air was considered the main factor affecting bubble size and its change. The foaming rate and volume change of the aqueous solution showed a high correlation with each other. Spherical bubbles in the early stage eventually transformed into angular bubbles. Moreover, over time, it was observed that the bubble size increased.

Optimal Process Conditions for Powder Bed Fusion and Analysis of Properties of Maraging Steel

A Ra Jo,Ji Seob An,Sun Hyung Kim,Dong Yong Park,Young Hoon Moon,Sun Kwang Hwang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10

Powder bed fusion (PBF), an additive manufacturing technology, has been widely used in the manufacturing field to create complex designs. Most PBF process studies have investigated the effect of laser power and scan speed on the mechanical properties and porosity of microstructure. In this study, five process conditions were selected to obtain superior properties of maraging steel, which were validated by absolute density analysis, hardness, and tensile tests. Maraging steel exhibits diverse mechanical properties depending on the heat-treatment combinations of solution annealing and aging. Mechanical property tests were conducted to compare the various temperature properties of the fabricated maraging steel under optimal conditions. Maraging steel exhibited a hardness of 612.7 HV and a tensile strength of 1925.6 MPa at 25 °C, and the strength was greater than 1000 MPa at temperatures below 600 °C. Additionally, the applicability of a fabricated die for maraging steel was investigated. The maraging steel die and American Iron and Steel Institute (AISI) D2 were analyzed by a forging process based on die load data sensing with a piezoelectric bolt. The maximum loads of the sensor in horizontal and vertical directions were 24.7% and 15.8% lower for the fabricated die than those of AISI D2. The findings confirm that the fabricated maraging steel is a suitable manufacturing process for commercial processes and can be used to manufacture dies with complex shapes.

Optimal Manufacturing Conditions for Korean Soybean Paste and Soy Sauce, Using Aspergillus oryzae AJ 100 as a Flavor Improver

Hea Kyeung Park,Jong Kyu Kim 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.1

Previously, it has been reported that Aspergillus oryzae can efficiently degrade unpleasant odor components such as butyric acid and 3-methyl butanoic acid from meju, a major ingredient in both Korean soybean paste (doenjang) and soy sauce. In this study, the optimal manufacturing conditions for the production of superior quality Korean soybean paste and soy sauce were determined. Specifically, A. oryzae AJ 100 was utilized to improve the flavor of these products. Mixtures of Korean soybean paste and A. oryzae AJ 100 culture (2 : 1), and of Korean soy sauce and A. oryzae AJ 100 culture (5 : 1), were incubated for 2 weeks at 30℃, and showed improved flavor. Butyric acid and 3-methyl butanoic acid were clearly degraded under these culture conditions.

A Clustering-based Equipment Condition Model for Chemical Vapor Deposition Process

유영지,박승환,백준걸 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.10

In semiconductor manufacturing, equipment condition monitoring is important to improve the efficiency of the manufacturing process by performing equipment maintenance in a timely manner. In this paper, we propose the clustering-based equipment condition model to select key sensors relating to a maintenance. During the manufacturing process, huge amounts of data are collected in real time from sensors on the equipment. The sensor data has various patterns, such as increased pattern, decreased pattern, unchanged pattern, and other patterns. We apply five clustering algorithms to group the sensors with similar characteristics and extract key sensors that are highly correlated with equipment health condition. The health condition monitoring model consists of the combination of key sensors. To validate proposed method, the empirical study is conducted using collected sensor data from a chemical vapor deposition (CVD) process in a semiconductor company in the Republic of Korea. The model with clustered sensors outperforms the model with full sensors. The health condition monitoring model assists engineers in making decisions regarding the equipment maintenance.

회수품질이 불확실한 제조/재생 혼합시스템의 최적 생산 정책

이지수 ( Ji Soo Lee ) 한국경영공학회 2014 한국경영공학회지 Vol.19 No.1

In this paper, we study the procedure to jointly determine the amount of products manufactured and the amount of products remanufactured in a hybrid manufacturing/remanufacturing system when the condition of the used products returned varies widely and uncertainly. We assume that remanufacturing cost is a linear function of condition and derive the expected total cost of this situation as a function of manufactured quantity and remanufactured quantity. We derive the optimal solution that minimizes the total expected cost under the assumption of uniformly distributed demand. The sensitivity of the optimal values of the decision variables with respect to the remanufacturing cost components is also investigated.

Effects of two droplet-based dissolving microneedle manufacturing methods on the activity of encapsulated epidermal growth factor and ascorbic acid

Huh, Inyoung,Kim, Suyong,Yang, Huisuk,Jang, Mingyu,Kang, Geonwoo,Jung, Hyungil Elsevier 2018 European journal of pharmaceutical sciences Vol.114 No.-

<P><B>Abstract</B></P> <P>Dissolving microneedle (DMN) is an attractive, minimally invasive transdermal drug delivery technology. The drugs encapsulated in the DMNs are exposed to a series of thermal, chemical, and physical stresses during the fabrication process, decreasing their therapeutic activity. Current DMN fabrication methods, such as micro-molding, drawing lithography, droplet-born air blowing, and centrifugal lithography, undergo different manufacturing processes involving differing stress conditions. Among the methods, we compared the effects of two droplet-based methods, droplet-born air blowing and centrifugal lithography, on the activity of encapsulated drugs using epidermal growth factor and ascorbic acid as model drugs. Although the appearance and physical properties of DMNs fabricated by the two methods were similar, the immunoreactivity of encapsulated epidermal growth factor in centrifugal lithography and droplet-born air blowing was 92.08±2.86% and 80.67±8.00%, respectively, at baseline, and decreased to 75.32±19.40% and 41.75±16.17%, respectively, 24h after drug-loading. The free-radical scavenging activity of ascorbic acid was maintained at 88.24±0.78% in DMNs fabricated by centrifugal lithography, but decreased over time to 67.02±1.11% in DMNs fabricated by droplet-born air blowing. These findings indicate that the manufacturing conditions of centrifugal lithography exert less stress on the drug-loaded DMNs, minimizing activity loss over time, and therefore that centrifugal lithography is suitable for fabricating DMNs loaded with fragile biological drugs.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>