• Journal of the Korean Society of Food Science and Nutrition
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• v.29 no.6
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• pp.1062-1067
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• 2000

상품성이 떨어지는 감자의 효율적 활용을 위하여 감자식포 제조공정을 반응표면분석에 의해 최적화하였다. 품질이 일정하고 단기간에 대량생산이 가능한 발효조건을 확립하기 위하여 반응표면분석으로 식초 제조조건 설정을 위해 알콜 발효와 초산발효 2단계로 구분하여 모니터링하였다. 그 결과 1단계 알콜발효에서 알콜함량이 최대치를 나타내는 조건은 감자에 대한 백분율로 첨가한 가수량 241.35%(v/w), 교반속도 8.05 rpm 및 발효시간 34.81 hr으로 나타났다. 알콜발효에서 알콜함량에 대한 최적조건으로 알콜발효 후 2단계로 초산발효를 행하여 초산발효조건을 예측하였다. 그 결과 총산이 최대치를 나타내는 조건은 교반속도 169.89 rpm 및 발효시간 285.12 hr로 나타났다. 최적조건에서 예측된 알콜발효 및 초산발효의 결과는 최적조건에서 실제 발효를 행한 결과와 유사하였다.

• Clean Technology
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• v.17 no.3
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• pp.215-224
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• 2011

It is an important issue to develop quality assessing system for biofuel for the purpose of accelerating the mass production of biofuel. It is particularly challenging to conduct testing method in the mass production of bioethanol while meeting quality specifications such as ASTM (American Society for Testing & Materials) D4806-10. In order to address this challenge, this paper proposes on-line spectroscopic quality assesment system based on Near Infrared spectrum and Partial Least Squares method in Chemometrics. As a result of testing a number of preprocessing methods and Partial Least Squares, it was found out that Savitzky-Golay method showed the best performance in terms of spectrum correction, noise reduction, and model maintenance. The proposed system allows us to assess multiple quality components continuously using spectroscopic facilities with the cheap cost. Since the value of R2 is more than 0.99, it is possible to replace the laboratory analysis.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.14 no.2
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• pp.115-121
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• 2021

This paper used big data and artificial intelligence technology to predict the rapidly increasing internet traffic. There have been various studies on traffic prediction in the past, but they have not been able to reflect the increasing factors that induce huge Internet traffic such as smartphones and streaming in recent years. In addition, event-like factors such as the release of large-capacity popular games or the provision of new contents by OTT (Over the Top) operators are more difficult to predict in advance. Due to these characteristics, it was impossible for an ISP (Internet Service Provider) to reflect real-time service quality management or traffic forecasts in the network business environment with the existing method. Therefore, in this study, in order to solve this problem, an Internet traffic collection system was constructed that searches, discriminates and collects traffic data in real time, separate from the existing NMS. Through this, the flexibility and elasticity to automatically register the data of the collection target are secured, and real-time network quality monitoring is possible. In addition, a large amount of traffic data collected from the system was analyzed by machine learning (AI) to predict future traffic of OTT operators. Through this, more scientific and systematic prediction was possible, and in addition, it was possible to optimize the interworking between ISP operators and to secure the quality of large-scale OTT services.

• Korean Journal of Oriental Medicine
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• v.11 no.2
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• pp.155-165
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• 2005

This study was investigated to determine the quality control of Oriental medicine from stores dealing in Oriental medicine around Seoul and Daegu. We tested total 120 samples that widely used 15 species in herbal medicine (Lycii Fructus, Platycodi Radix, Angelicae Gigantis Radix and 12 others) being collected from Oriental medicine clinic, pharmacy, Oriental pharmacy, Oriental medical hospital and Oriental drug store. We have estimated Oriental medicine by K.P. (Korean Pharmacopoeia), K.H.P(Korean Herbal Pharmacopoeia) and announcement of KFDA. The items of examination were identification, purity, loss on drying, ash, acid insoluble ash, extract content, essential oil content, assay, heavy metal limit, and pesticides residue(BHC, DDT, Aldrin, Endrin, Dieldrin). As a result, 20 samples in total 120 samples were not satisfied with the standard and 7 species in total 15 species were not satisfied with the standard. Identification test, extract content test and pesticides residue(BHC, DDT, Aldrin, Endrin, Dieldrin) were satisfied with the standard. The result will be the basic data for the quality control of Oriental medicine.

• Applied Chemistry for Engineering
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• v.23 no.1
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• pp.35-41
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• 2012

This paper proposes a new methodology for the real-time on-line quality monitoring of biofuel processes through the integration of infrared spectroscopy and chemometrics. A method of Partial Least Squares (PLS) in Chemometrics is employed for quantitative analysis of key components in bioethanol products. After a number of preprocessing methods and variable importance in projection (VIP) are used, Savitzky-Golay method showed the best performance in terms of spectrum correction, noise reduction, and model maintenance. The proposed method allows us to economically forecast the concentration of multiple impurities encountered with the production of bioethanol. The proposed system is also accurate enough ($R^2$ > 0.99) to replace the laboratory analysis.

• Journal of Digital Convergence
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• v.10 no.11
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• pp.351-358
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• 2012

This study is aimed at suggesting optical communication equipment that can deliver high quality video information in high speed, to efficiently handle the flood and water pollution in the river basin. This system is cheaper than existing equipment, and can monitor optical Internet as well as the condition of equipment. Generally, the communication equipment to prevent flood is installed in an unmanned control box and operated by the flood control office situated at the fiver mouth in a long distance section. Therefore, it is hard to promptly cope with communication interruptions, which occur by the cutting or aging of the optical cable. Under the circumstances, this study suggested an efficient system that can deliver high quality video information in high speed (Optical Transmission Convert System) by using optical fiber. The system also solves problems by making use of automatic protection switching (APS) when an accident happens. Its real-time monitoring function gives notice of the problem-occurring points. The system is expected to be widely used in various areas such as intelligent traffic systems.

• Korean Journal of Construction Engineering and Management
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• v.8 no.3
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• pp.142-149
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• 2007

A ubiquitous environment in construction should be developed integrating hardware and software systems. The objective of this paper is to study the feasibility of applying the RFID technology to the concrete pour process, and improve the effectiveness of data exchange A pilot system of u-CPS (Ubiquitous Concrete Pour System) has been developed to test the feasibility. The pilot can automatically generate the data for concrete pour work such as departure time, arrival time, concrete pour time. Construction managers can keep track of the progress of concrete pour work using the information. A case study was done for a building construction using the pilot system, the result of which demonstrated that the RFID-base system can help improve the effectiveness of data communication during the concrete pour process.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.259-259
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• 2017

국내 하천에는 하천을 가로지르는 보나 낙차공과 같은 횡단구조물이 약 5만여개에 달하고 있다. 이러한 횡단구조물은 작업의 용이성 및 높은 강도로 인해 오랜 시간 콘크리트 소재로 사용되어 왔다. 기존 콘크리트 소재의 공법은 설치되어 있는 한 세굴 방지에 좋은 효과를 발휘한다는 장점이 있지만 포설된 공법은 시간이 지남에 따라 마모되거나 소실되는 문제가 발생되며, 최종적으로 하천횡단구조물의 안전성 및 심미성에도 영향을 미치게 된다. 이와 더불어 최근 기후변화로 인해 강우량의 증대 및 집중호우 등의 돌변하는 하천환경변화에 대한 적용 가능한 기술이 미비한 실정이다. 이러한 문제와 더불어 환경에 대한 관심이 높아짐에 따라 자연친화적 하천 및 생태복원 하천에 대한 하천 수질 및 생태학적 건강성에 대한 연구의 관심이 높아지고 있다. 최근 연구결과에 따르면 콘크리트 소재를 활용하여 횡단구조물을 설치할 경우, 콘크리트 소재의 문제점으로 제기되는 납, 크롬 등과 같은 중금속 용출과 석회석으로부터 유출되는 강염기성 물질로 인한 하천의 수질악화와 수생 생물이 독성환경에 노출되어 다양한 환경 생태학적 문제를 발생시킬 수 있다고 보고되어 있다. 본 연구에서는 콘크리트 소재의 대안으로 무 저독성 소재인 식물성 폴리우레탄을 이용하여 연구를 수행하였다. 기초 조사를 통해 콘크리트 소재의 대안으로 사용가능성을 확인하기 위하여 식물성 폴리우레탄의 물리적 강도를 확인하였으며, 환경에 미치는 영향을 파악하기 위하여 대한 생태학적 건강성을 확인하였다. 품질 특성은 바인딩강도, 내구성, 압축강도, 휨강도, 투수계수 등을 확인하였으며, 생태학적 건강성을 확인하기 위하여 양서 파충류의 독성 실험, 어류 독성평가, 부착조류에 대한 실험을 수행하였다. 이러한 결과를 바탕으로 시범지역인 대청천 일부 구간에 대하여 계절별 물리/화학/생물(식생, 어류, 저서동물)에 대한 모니터링을 수행하였다. 또한 홍수 전 후의 하상변동을 통해 개발기술의 안전성을 확인하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.8
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• pp.657-661
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• 2019

The automobile industry is representative industry of complex characteristics, which employing 10 million people, the largest manufacturing industry over $1 trillion in sales and assembling with 20,000 parts to make complete automobile and automobile assembly processes have a lower automation rate than other processes, which is labor intensive processes of assembling to painted body with 3,000 components such as seats, built-in, instrument panel, glass, engine, transmission units. However, the current assembly process does not have real-time monitoring. If a tool position tracking system is adapted to assembly process for directing consistent work order and checking for missing work, the productivity and quality improvement of the assembly process can be achieved by preemptively preventing possible defects in the assembly process. So, this paper aims to develop a Tool Position tracking system using UWB(Ultra Wide Band) with trilateration and proves their effectiveness for real-time monitoring of automotive assembly process.

• Aerospace Engineering and Technology
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• v.6 no.1
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• pp.230-236
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• 2007

The quality control of composite structure includes inspection, testing and monitoring in all processes from receiving inspection to part fabrication. The purpose of these activities is to ensure that the design objectives are consistently achieved. The quality factors include material, receiving inspection, storage and shelf-life control, environmental control, testing, inspection and record control. This paper presents the process verification method using destructive test and quality control method in composite structure of aircraft. And it is believed that the destructive test will be basis to obtain a reliability of non-destructive test in complex composite structure and to ensure the design requirements in composite part.