CGTase에 의해 생성된 사이클로아밀로오스를 이용한 효소적 포접 반응에 의한 피세틴의 낮은 수용해도 개선

정현모,강해나,이예림,김은아,이은형,심재훈 한국식품영양과학회 2022 한국식품영양과학회 학술대회발표집 Vol.2022 No.10

낮은 수용성을 개선한 Resveratrol 포접 복합체 (CA-RVT)의 물리화학적 특성 및 기능적 특성

정현모,김지수,이예림,김은아,심재훈 한국식품영양과학회 2020 한국식품영양과학회 학술대회발표집 Vol.2020 No.10

국내 유통 수박의 적정 포장설계를 위한 진동특성 분석

정현모,김만수,김기석,조병관,김대용 한국포장학회 2006 한국포장학회지 Vol.12 No.2

Shock and vibration inputs are transmitted from the transporting vehicle through the packaging to the fruit. The vibration causes sustained bouncing of fruits against each other and the container wall. The steady state vibration input may cause serous fruit injury, and the damage is particularly severe if the fruits are bounced at its resonance frequency. The determination of the resonance frequencies of the fruits and vegetables may help the packaging designer to determine the proper packaging system providing adequate protection for the fruits, and to understand the complex interaction between the components of the fruits when they relate to expected transportation vibration inputs. To analyze the vibration properties of the watermelon for optimum packaging design during transportation, sinusoidal sweep vibration tests were carried out. The resonance frequency of the watermelon ranged from 19 to 32 Hz and the amplitude at resonance was between 1.6 and 2.9 G. The resonance frequency and amplitude at resonance frequency band of the watermelon decreased with the increase of the sample mass. The multiple nonlinear regression equation for predicting the resonance frequency of the watermelon were developed using the independent variables such as mass, input acceleration and sphericity.

택배용 포장시스템이 적용된 과실의 랜덤 진동특성

정현모,김수일 한국포장학회 2015 한국포장학회지 Vol.21 No.2

Shock and vibration inputs are transmitted from the transporting vehicle through the packaging to the fruit during the parcel delivery service. The vibration causes sustained bouncing of fruits against each other and the container wall. The steady state vibration input may cause serous fruit injury, and the damage is particularly severe if the fruits are bounced at its resonance frequency. The determination of the resonance frequencies of the fruits and vegetables may help the packaging designer to determine the proper packaging system providing adequate protection for the fruits, and to understand the complex interaction between the components of the fruits when they relate to expected transportation vibration inputs. To analyze the vibration properties of the apples for optimum packaging design during transportation for parcel delivery service, random vibration tests were carried out. In the random vibration test, the resonance frequency and PSD of the apples in packaging system for parcel delivery service in the test were in the range of 13 to 99 Hz and 0.0143~0.0923 G2/Hz.

Resveratrol의 낮은 수용성 개선을 위해 CGTase로부터 생성된 Cycloamylose를 이용한 포접 반응

정현모,신유정,우승혜,김지수 한국식품영양과학회 2019 한국식품영양과학회 학술대회발표집 Vol.2019 No.10

Quality Change of Packaged Pears for Export due to Vibration Stress during Transportation

정현모,최동수,황성욱,박종민 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.2

The characteristics of vibrational stress (shock and vibration) during transport and the possibility of damage to the packaged pears were investigated. And this study was conducted to analyze how environmental conditions during transportation affect quality factors such as oxygen (O2) and carbon dioxide (CO2) concentrations, weight loss rate, ethylene production, soluble solids content (SSC), and firmness (bioyield strength) of packaged pears for exporting. Pears with or without vibration stress were stored for 30 days at low temperatures (5 ± 0.8℃, 80 ± 5% relative humidity). Statistically significant difference (p ≤ 0.05) between pears with and without vibrational stress for oxygen concentration (O2; 11.8 ± 1.5% and 16.1 ± 2.1%; initial 20.9 ± 1.4%), carbon dioxide (CO2; 25.8 ± 3.2% and 19.1 ± 02.9%, initial 1.1 ± 0.2%) and ethylene (72.3 ± 5.2 µLL–1 and 65.1 ± 4.8 µLL–1, initial 18.3 ± 2.5 µLL-1) in the headspace of the gas collection container after 30 days storage. Significant differences also for pears with and without vibrational stress in relation to soluble solids content (16.2 ± 1.2% and 17.1 ± 1.4%, initial 13.8 ± 0.8% and 14.1 ± 0.9%, respectively), weight loss (6.4 ± 0.7 g day-1 and 5.0 ± 0.6 g day-1), firmness (38.23 ± 7.2 kPa and 70.92 ± 13.2 kPa; initial 249.87 ± 14.8 kPa and 254.29 ± 10.7 kPa) after 30days storage. Vibration stress accelerated pear quality deterioration during storage, resulting in increased weight loss, soluble solids content, headspace CO2 and ethylene production, and reduced hardness and headspace O2

Ethylene Production of Packaged Apples under Vibration Stress in Simulated Transportation Environment

정현모,유영옥 한국포장학회 2017 한국포장학회지 Vol.23 No.2

Fruits are subjected to a variety of vibration stress during the transportation from a production area to markets. Vibration inputs are transmitted from the transporting vehicle through the packaged fruit. And the steady state vibration input may cause serious internal damage of fruit. Product quality of fruits declines by various factors while they are stored right after harvesting and among the substance in charge of post ripening action, ethylene (C2H4) biosynthesis increases fruits' respiration process after harvesting and decreases storage expectancy. Ethylene production of apples rapidly increases while storage duration becomes longer. This tendency is much clearer for the apples with vibration stress at input acceleration level. When there was no vibration stress, change in ethylene production level of apples are not very large during storage. Ethylene production rates inside the gas collecting container increased significantly (p ≤ 0.05) after 24 hours storage, particularly for apples with vibration stress (0.7 μl/kg·hr (1st stack), 0.78 μl/kg·hr (2nd stack), 0.96 μl/ kg·hr (3rd stack)); whereas less ethylene was produced in control apples (0.18 μl/kg·hr) during storage. Also ethylene production rates of apples according to the stack position were significantly different (p ≤ 0.05). The vibration stress clearly accelerated the degradation of apple quality during storage, resulting in increased ethylene production.

Effects of Vibration Stress on the Quality of Packaged Apples during Simulated Transport

정현모,박정길 한국농업기계학회 2012 바이오시스템공학 Vol.37 No.1

Purpose: The characteristics of in-transit vibration stress and possible damage to packaged apples were examined. Methods: A simulated transportation environment with a specific power density profile was used for vibration impact experiments to determine the resulting decrease in packaged apple quality. Apples with or without vibration stress were stored at low temperature (5 ± 0.8℃, 75-85% relative humidity) for 30 days. Statistically significant differences (p ≤ 0.05)were found between apples with and without vibration stress for oncentration of oxygen (O2; 11.2% and 14.1%, respectively; initially 20.9 ± 0.4%), carbon dioxide (CO2; 26.4% and 21.8%; initially 1 ± 0.2%), and ethylene (79.4 μLL-1 and 55.6 μLL-1; initially 14.1 ± 0.6 μLL-1) in the headspace of a gas-collecting container after 30 days of storage. Results: Significant differences were also measured for apples with and without vibration stress with respect to soluble solid content (15.4% and 14.9%, respectively; initially 12.9 ± 0.8% and 13.1 ± 1.1%), weight loss (10.1% and 8.2%), and firmness (139.7 kPa and 163.3 kPa; initially 213.8 ± 6.2 kPa and 209.1 ± 7.9 kPa) after 30 days of storage. Conclusions: The vibration stress clearly accelerated the degradation of apple quality during storage, resulting in increased weight loss, soluble solid content, and headspace CO2 and ethylene production, and decreased firmness and headspace O2.

HEMA를 포함한 실리콘 하이드로젤 렌즈의 제조 및 물성 연구

정현모,이민제,성아영 대한시과학회 2017 대한시과학회지 학술대회 Vol.2017 No.11

목적: 본 연구는 모노머의 실리콘 하이드로젤 렌즈 재료로서의 활용도를 알아보기 위해 실리콘 하이드로젤 기준시료에 HPMA를 비율별로 첨가하여 제조하였다. 방법: 실리콘 및 DMA(N.N.Dimethylacrylamide), 교차결합제인 EDGMA 그리고 열 개시제를 기본 조합으로 하여 혼합하였다. 또한 제조된 첨가제인 HPMA(Hydroxypropyl methacrylate)를 10%~50% 비율로 각각 첨가하여 열중합 하였다. 또한 물리적 특성인 산소투과율(DK) 그리고 함수율을 각각 측정한 후 분석하였다. 결과: 제조된 실리콘 하이드로겔 콘택트렌즈는 첨가제인 Hydroxypropylmethacrylate의 첨가 비율이 증가할수록 DK 값이 37.15에서 22.25로 감소하는 경향을 보였다. 또한 첨가량이 30% 및 50%에서 급격하게 감소함을 보였다. 또한 HPMA 첨가비율이 증가할수록 함수율이 41.81에 서 46.31로 다소 증가하는 경향을 나타내었다. 결론: 본 연구를 통해 HPMA(Hydroxypropylmethacrylate)의 첨가는 콘택트렌즈의 함수율을 증가시켜 적절한 비율로 첨가 시 고함수율 및 고산소투과율의 콘택트렌즈 소재로 활용될 수 있을 것으로 판단된다.

농산물 포장용 지류완충재의 새로운 완충곡선 구현을 통한 완충성능 평가

정현모 한국포장학회 2013 한국포장학회지 Vol.19 No.1

본 실험에서는 청과물의 포장 완충재로 사용되고 있는 골판지의 압축 및 충격특성을 이용하여 완충곡선(peak accel-eration - static stress curve)을 구현하 기 위한 알고리즘을 제시하였다. 본 연구에서 알 수 있듯이 한 개의 동적계수로 도 완충곡선을 구현할 수 있음을 알 수가 있었으며, 기존의 완충곡선의 구현시 정적응력 범위 내에서의 실험횟수를 현 저하게 줄일 수 있음을 알 수가 있었다. 또한, 골판지 완충 재료외에 플라스틱 발포체 완충재료에도 적용이 가능할 것으로 판단되었다. From the time the product is manufactured until it is carried and ultimately used, the product is subjected to some form of handling and transportations. During this process, the product can be subjected to many potential hazards. One of them is the damage caused by shocks. In order to design a product-package system to protect the product, the peak acceleration or G force to the product that causes damage needs to be determined. When a corrugated fiberboard box loaded with products is dropped onto the ground, part of the energy acquired due to the action of the gravitational acceleration during the free fall is dissipated in the product and the package in various ways. The shock absorbing characteristics of the packaging cushion materials are presented as a family of cushion curves in which curves showing peak accelerations during impacts for a range of static loads are shown for several drop heights. The new method for determining the shock absorbing characteristics of cushioning materials for protective packaging has been described and demonstrated. It has been shown that cushion curves can be produced by combining the static compression and impact characteristics of the material. The dynamic factor was determined by the iterative least mean squares (ILMS) optimization technique in which the discrepancies between peak acceleration data predicted from the theoretical model and obtained from the impact tests are minimized. The approach enabled an efficient determination of cushion curves from a small number of experimental impact data.