• Title/Summary/Keyword: Industrial by-products

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Analysis of γ-Aminobutyric Acid Content in Fermented Plant Products by HPLC/UV

  • Lee, Dong Gu;Cho, Sunghun;Lee, Jamin;Cho, Seon Haeng;Lee, Sanghyun
    • Journal of Applied Biological Chemistry
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    • v.58 no.4
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    • pp.303-309
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    • 2015
  • ${\gamma}$-Aminobutyric acid (GABA) content in fermented plant products and their main plant materials (aerial part of Acanthopanax sessiliflorus, fruit of Crataegus pinnatifida, and whole plant of Morus alba) was determined by high-performance liquid chromatography. GABA was quantified using a reverse-phase column with a gradient elution program (water:acetonitrile =90:10 to 0:100 for 40 min). UV detection was conducted at 280 nm. GABA content was measured in fermented plant products (15.07 mg/g), aerial part of A. sessiliflorus (4.49 mg/g), fruit of C. pinnatifida (10.59 mg/g), and whole plant of M. alba (2.31 mg/g). The presence of GABA in fermented plant products, including A. sessiliflorus, C. pinnatifida, and M. alba is important in industrial application for health supplements.

A Study on Design Development of Wooden Products through the System of Educational and Industrial Cooperation (산학협동을 통한 목제품 디자인 개발에 관한 연구)

  • 윤여항
    • Journal of the Korea Furniture Society
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    • v.12 no.1
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    • pp.131-142
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    • 2001
  • Cultural needs of human have grown enormously. Consumer trend and individual taste have become more individualistic and diversified. Efforts to improve the quality of life have changed the concept of lift space as well as the concept of interior life supplies. Products are no longer standardized and produced in massive scale, thus a shift of value has risen. Damages done by the economical development have made consumers take interests in products that are more natural and in harmony with human beings. It is a tendency that wooden materials are becoming a preference as a specific alternative. There is a great social change with a new paradigm like this. Considering the change, we propose a new vision and activation plan on design development of wooden products through specific and practical studies by the system of educational and industrial cooperation which is an organic association system for developing human resources of educational system and producing profits of industry. From it, we can expect great effects as a competitive design of coming future.

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In situ monitoring-based feature extraction for metal additive manufacturing products warpage prediction

  • Lee, Jungeon;Baek, Adrian M. Chung;Kim, Namhun;Kwon, Daeil
    • Smart Structures and Systems
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    • v.29 no.6
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    • pp.767-775
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    • 2022
  • Metal additive manufacturing (AM), also known as metal three-dimensional (3D) printing, produces 3D metal products by repeatedly adding and solidifying metal materials layer by layer. During the metal AM process, products experience repeated local melting and cooling using a laser or electron beam, resulting in product defects, such as warpage, cracks, and internal pores. Such defects adversely affect the final product. This paper proposes the in situ monitoring-based warpage prediction of metal AM products with experimental feature extraction. The temperature profile of the metal AM substrate during the process was experimentally collected. Time-domain features were extracted from the temperature profile, and their relationships to the warpage mechanism were investigated. The standard deviation showed a significant linear correlation with warpage. The findings from this study are expected to contribute to optimizing process parameters for metal AM warpage reduction.

Application of Precast Concrete Products of Non-Sintered Cement Mortar based on Industrial by-Products (산업부산물을 이용한 비소성 시멘트 모르타르의 프리캐스트콘크리트 제품 적용성 평가)

  • Na, Hyeong-Won;Moon, Kyoung-Ju;Hyung, Won-Gil
    • Journal of the Korea Institute of Building Construction
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    • v.20 no.1
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    • pp.19-26
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    • 2020
  • This study aimed to develop non-sintered cement that could replace portland cement which emits large amount of carbon dioxide during firing process. For this purpose, ground granulated blast furnace slag, type c fly ash and slaked lime were used. In addition, through the experimental results, the characteristics of the non-sintered cement binders according to the mixing ratios will be identified, and the utilization plans for the precast concrete products will be presented. In this experiment, non-sintered cement binders using industrial by-products were prepared to compare the flexural strength and compressive strength of each of the 3, 7 and 28 days. As a result, the results satisfy the KS of the target product proposed in this study. Therefore, this study presents the possibility of using precast concrete products by developing non-sintered cement binders using industrial by-products.

Warranty Models with Discrete Preventive Maintenance (이산예방보수 정책을 고려한 보증모형분석)

  • Kim, Che-Soong
    • IE interfaces
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    • v.15 no.3
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    • pp.286-296
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    • 2002
  • Products which are sold with warranty, preventive maintenance actions by manufacturers and/or buyers have an impact on the total costs for both parties. In this paper, we develop the models to study the expected warranty cost for products with free repairable warranty with three types of discrete preventive maintenance. We deal with by utilizing the concept that preventive maintenance reduces the virtual age of the system. We assume that the maintenance planning horizon can be segmented into k discrete and equally sized periods. In such a scenario, numerical examples are presented.

Expansion Properties of Mortar Using Waste Glass and Industrial By-Products (폐유리와 산업부산물을 사용한 모르터의 팽창특성)

  • 박승범;이봉춘
    • Journal of the Korea Concrete Institute
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    • v.14 no.3
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    • pp.440-448
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    • 2002
  • Waste glass has been increased with the development of industry. The utilization of waste glass for concrete can cause the concrete to be cracked and to be weakened due to an expansion by alkali-silica reaction(ASR). In this study, ASR expansion and properties of strength were analyzed in terms of waste glass color(amber, emerald-green), industrial by-products(ground granulated blast-furnace slag, fly ash), and the content of industrial by-products for reducing ASR expansion caused by the waste glass. The possibility of using glass ground as pozzolanic properties was also analyzed. From the result of this study, the pessimum size of waste glass was 2.5∼1.2 mm regardless of waste glass color. And the smaller than 2.5∼1.2 mm waste glass is, the more decreasing expansion of ASR is. Also, the combination of waste glass with industrial by-products have an effect on reducing the expansion and strength loss caused by ASR between the alkali in the cement paste and the silica in the waste glass, and the glass ground of less than 0.075 mm is applicable as a pozzolanic material.

A Study on the Estimation of Average Service Life for New Technology Products-in Case of Solor-cell (신기술 제품의 ASL 추정-솔라셀 사례 중심으로)

  • Cho, Jin-Hyung;Lee, S.J.;Oh, H.S.;Baek, S.S.;Kim, O.J.;Kim, B.K.;Jeong, K.S.;Park, S.H.;Kwon, D.C.;Ko, J.H.;Ryu, J.H.;Shim, S.C.
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.37 no.4
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    • pp.106-115
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    • 2014
  • Until now, because a new product (or facility) launched in market has been retired from one year of age, we can have had ASL by stub-curve method by Iowa curve. Recently, many innovative products with important role in market like display and solar-cell etc. are more durable and, what are better, they have the constant variance in ASL because of their good quality. Of course, there are some ones like smart mobile phone with relatively big dispersion in ASL. Estimating ASL of products like display and solar-cell etc., the new approach is needed. In this paper a new method applied traditional Iowa curve with accelerated reliability test (indoor/outdoor) etc. is proposed.

An improved Ordering and Recovery Policy for Reusable Items (재활용품 제고시스템에 대한 주문 및 재생정책의 개선방안)

  • Jung, Jin-A;Koh, Shie-Gheun
    • Journal of Korean Institute of Industrial Engineers
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    • v.34 no.1
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    • pp.32-41
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    • 2008
  • This paper studies a joint EOQ and EPQ model in which a stationary demand can be satisfied by recycled products as well as newly purchased products. The model assumes that a fixed quantity of the used products are collected from customers and later recovered for reuse. The recovered products are regarded as perfectly new ones. We also assume that the number of orders for newly purchasing items and the number of recovery setups in a cycle can be mutually independent integers. Under these assumptions, we develop an optimization model obtaining the economic order quantity for newly procured products, the optimal lot size for the recovery process, and the sequence of the orders and the setups, simultaneously. And then a simple solution procedure to find a local optimal control parameter set is proposed. To validate the model and the solution procedure, finally, some computational experiments are presented.

A Study on Customer Satisfaction Improvement of Shoe Products by the Analysis of Requirement Survey (구두제품 요구조사 분석을 통한 고객만족향상 방안 - 20~40대 여성을 중심으로 -)

  • 황인극;김진호;김용진
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.25 no.1
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    • pp.63-70
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    • 2002
  • The purpose of this paper is to investigate the customer's requirements for shoe products using the survey method, to analyze customers' needs, and to supply information to make the shoe that they want. For this work, we made 38 survey items for the degree of shoe satisfaction, for foot care and shoe control, for shoe characteristics, and for shoe purchase in future. For the purchase of shoe products in future, customers in their twenties gave the highest score for shoe design among price, design, size, fashion, fitness, color, brand, so forth. However, respondents in their forties selected the degree of fitness instead of shoe design. In the question for the buying price of shoe products in future, all customers wanted shoe products between 30,000 won md 50,000 won.