• 한국축산식품학회지
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• 제44권2호
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• pp.309-325
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• 2024

The consumption of meat has been increasing, leading to a dynamic meat and meat processing industry. To maintain the quality and safety of meat products, various technologies have been explored, including intense pulsed light (IPL) technology. Several factors affect the inactivation of microorganisms by IPL treatment, including light intensity (fluence), treatment duration, pulse frequency, and the distance between the lamp and the samples. Meat products have been studied for IPL treatment, resulting in microbial reductions of approximately 0.4-2.4 Log. There are also impacts on color, sensory attributes, and physico-chemical quality, depending on treatment conditions. Processed meat products like sausages and ham have shown microbial reductions of around 0.1-4 Log with IPL treatment. IPL treatment has minimal impact on color and lipid oxidation in these products. Egg products and dairy items can also benefit from IPL treatment, achieving microbial reductions of around 1-7.8 Log. The effect on product quality varies depending on the treatment conditions. IPL technology has shown promise in enhancing the safety and quality of various food products, including meat, processed meat, egg products, and dairy items. However, the research results on animal-based food are not diverse and fragmentary, this study discusses the future research direction and industrial application through a review of these researches.

• 농업과학연구
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• 제51권3호
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• pp.361-373
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• 2024

Syzygium formosum has been traditionally used in Vietnam as a folk medicine for treating skin and respiratory diseases. With the recent recognition of its beneficial effects such as anticancer, antioxidant, and anti-inflammatory properties, there is an increasing interest in industrial extraction of its bioactive compounds, such as triterpenoids and flavonoids. In this study, the extraction efficiencies of S. formosum were analyzed by extraction methods and harvest timings. Firstly, it was found that distilled water treatment substantially eliminated almost all flavonoids, suggesting that minimal pretreatment is important to preserve both triterpenoids and flavonoids. Secondly, extractions with 70% ethanol at both lab and pilot scales effectively yielded more than 70% of triterpenoids and flavonoids from S. formosum. Lastly, to investigate the seasonal variation in phytochemicals, extracts from the leaves of S. formosum harvested in April, August, October, and December in Vietnam were analyzed. It was revealed that seasons with lower temperatures led to higher concentrations of triterpenoids and flavonoids. Specifically, December was found to be optimal for obtaining high concentrations of triterpenoid and October for flavonoid. Consequently, this research provides a foundation for the industrial application of S. formosum, providing critical insights into maximizing the extraction efficiency and phytochemical contents through optimized processing methods and strategic harvesting.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2000년도 추계학술대회 및 정기총회
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• pp.161-164
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• 2000

A cyclic shop is a production system that repeatedly produces identical sets of jobs, called minimal part sets, in the same loading and processing sequence. We consider a version of cyclic shop where the operations are processed and unloaded within time limits, so called a time window. We model the shop using an event graph model, a class of Petri nets. To represent the time window constraint, we introduce places with negative time delays. From the shop modeling graph, we develop a linear system model based on the max- plus algebra and characterize the conditions on the existence of a stable schedule.

• Food Science and Biotechnology
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• 제18권6호
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• pp.1511-1514
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• 2009

Liquid whole egg (LWE) was subjected to high hydrostatic pressure (HHP), a consecutive combination of nisin and HHP (nisin-HHP), or a consecutive combination of ultrasound and HHP (ultrasound-HHP), and functional properties of processed LWE were compared to those of raw LWE. Little changes in foaming and emulsifying properties were observed by the application of HHP alone and the combined process of nisin and HHP. In contrast, ultrasound-HHP combination resulted in significant changes in color, foaming, and emulsifying properties. The maintenance of functional properties after HHP treatment agreed with expectation, because the HHP processing condition had been selected where minimal rheological changes had occurred.

• Journal of the Korean Wood Science and Technology
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• 제51권6호
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• pp.447-447
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• 2023

This study aimed to convert underutilized moso bamboo into high-value added products such as fences, interior materials, lighting fixtures, and accessories. Green moso bamboo poles with a diameter of approximately 10 cm and a length of approximately 3.7 m were heat treated at 140℃ using a large-scale kiln. The processing time was meticulously adjusted through various stages, including pretreatment (6-8 hours at 60℃), cooking (8-10 hours at 100℃), steaming (26-30 hours at 120℃), heating (4-6 hours at 140℃), and finally, cooling (below 80℃). A meticulously designed heat treatment process has enabled efficient mass production of moso bamboo poles with improved qualities, including minimal splitting, moisture levels below 3%, and a specific gravity of 1.05. The focus of this study was to present the physical and drying properties, such as color, dimensional change, specific gravity, moisture content, and splitting, observed during the heat treatment process.

• 한국식품과학회지
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• 제33권4호
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• pp.469-473
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• 2001

최소가공처리를 행한 신선 사과의 저장수명을 연장시키기 위하여 사과 품종 중 Fuji사과를 이용하여 최소가공 처리를 행한 후 서로 다른 산소, 이산화탄소 및 수분 투과도를 가지는 필름으로 포장하여 저온저장 하였다. 저장중의 색도 변화, texture, pH, 산도, 가용성 고형분 함량 및 포장재 내부의 공기조성을 측정하였다. 신선절단 및 유기산 처리를 한 사과의 firmness는 저장기간 경과에 따라 증가하다가 저장 3주부터 감소하였다. 신선절단 사과의 품질에 가장 큰 영향을 미치는 과육의 갈변현상은 무처리구의 경우 저장 1주일을 전후로 일어났으며 1% oxalic acid를 처리한 사과의 경우 포장 필름의 종류에 상관없이 저장 초기에는 백색도가 증가하였으나 시간경과에 따라 과육의 연화 현상과 함께 갈변이 심화되었고 특히 L340필름으로 포장한 경우 L값의 변화가 가장 심하게 일어났다. 반면 사과를 1% ascorbic acid 용액에 침지한 후 P640필름에 포장하여 저장한 구는 색도, pH, 가용성 고형분, 적정산도에서 품질 변화가 가장 작게 나타났다.

• ETRI Journal
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• 제37권3호
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• pp.471-479
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• 2015

Traditional designs of cognitive radio (CR) focus on maximizing system throughput. In this paper, we study the joint overlay and underlay power allocation problem for orthogonal frequency-division multiple access-based CR. Instead of maximizing system throughput, we aim to maximize system energy efficiency (EE), measured by a "bit per Joule" metric, while maintaining the minimal rate requirement of a given CR system, under the total power constraint of a secondary user and interference constraints of primary users. The formulated energy-efficient power allocation (EEPA) problem is nonconvex; to make it solvable, we first transform the original problem into a convex optimization problem via fractional programming, and then the Lagrange dual decomposition method is used to solve the equivalent convex optimization problem. Finally, an optimal EEPA allocation scheme is proposed. Numerical results show that the proposed method can achieve better EE performance.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제18권8호
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• pp.2366-2380
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• 2024

In this study, a high-speed template matching system is proposed for wafer-vision alignment. The proposed system is designed to rapidly locate markers in semiconductor equipment used for wafer-vision alignment. We optimized and implemented a template-matching algorithm for the high-speed processing of high-resolution wafer images. Owing to the simplicity of wafer markers, we removed unnecessary components in the algorithm and designed the system using a field-programmable gate array (FPGA) to implement high-speed processing. The hardware blocks were designed using the Xilinx ZCU104 board, and the pyramid and matching blocks were designed using programmable logic for accelerated operations. To validate the proposed system, we established a verification environment using stage equipment commonly used in industrial settings and reference-software-based validation frameworks. The output results from the FPGA were transmitted to the wafer-alignment controller for system verification. The proposed system reduced the data-processing time by approximately 30% and achieved a level of accuracy in detecting wafer markers that was comparable to that achieved by reference software, with minimal deviation. This system can be used to increase precision and productivity during semiconductor manufacturing processes.

• 센서학회지
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• 제24권4호
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• pp.228-231
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• 2015

Ultrasonic motors provide high torques and quick responses compared to their magnetic counterparts; therefore, they are widely used in small-scale applications such as mobile phones, microrobots, and auto-focusing modules in digital cameras. To determine the feasibility of lead-free piezoceramics for ultrasonic motor applications, we fabricated a ring-type piezoceramic with a KNN-based lead-free piezoceramic (referred to as CZ5), intended for use in an auto-focusing module of a digital camera. The vibration of the lead-free stator was observed at 45.1 kHz. It is noteworthy that the fully assembled lead-free ultrasonic motor exhibited a revolution speed of 5-7 rpm, even though impedance matching with neighboring components was not considered. This result suggests that the tested KNN-based piezoceramic has great potential for use in ultrasonic motor applications, requiring minimal modifications to existing lead-based systems.

• 한국식품과학회지
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• 제33권2호
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• pp.178-183
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• 2001

신갈나무 잎 추출물의 항균력은 추출 온도별로는 $60^{\circ}C$에서 추출시 $30^{\circ}C$와 $90^{\circ}C$에 추출하는 것보다 약간 더 높은 활성을 나타내었으며 추출 용매별로는 에탄올로 추출한 경우가 물 또는 메탄올 추출물보다 대체로 높은 항균활성을 나타내었다. 신갈나무 잎 에탄올 추출물은 그람양성균인 B. cereus, S. aureus 그리고 L. monocytogenes균에 대하여 $62.5{\sim}125\;{\mu}g/mL$ 범위에서 최소저해농도를 나타내었으나 그람음성균인 S. typhimurium과 P. aeruginosa 균은 $250\;{\mu}g/mL$, E. coli O157:H7 균에 대하여는 $500\;{\mu}g/mL$ 이상에서 최소저해농도를 나타내었다. B. subtilis ATCC 6633균과 L. monocytogenes ATCC 19111균에 대한 젖산, 구연산, 초산 및 신갈나무 잎 에탄올 추출물의 최소저해농도는 두균모두 각각 2,500, 5,000, 1,250 및 $125\;{\mu}g/mL$이었으며 이들의 병용처리시 B. subtilis ATCC 6633균에는 효과가 없었으나 L. monocytogenes ATCC 19111균에 대하여는 상승항균효과를 나타내었다. 한편, 각각의 sub-lethal 농도에서 E. coli O157:H7 0019균에 대한 신갈나무 잎 에탄올 추출물과 유기산들과의 병용처리시 두 물질간에는 상승효과는 없는 것으로 나타났다.