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이현자(Hyun-Ja Lee),설민숙(Min-Sook Sul),차보숙(Bo-Sook Cha),육홍선(Hong-Sun Yook) 한국식품영양과학회 1998 한국식품영양과학회지 Vol.27 No.5
본 연구는 국내에서 가장 많은 생산량과 가공용으로 이용되고 있는 황색 콩을 대상으로 5℃, 25℃ 및 35℃에서 8개월간 저장하면서 콩의 이화학적 특성변화와 두부를 제조하여 그 품질특성을 검토함으로써 가공용 콩의 품질보존을 위한 기초자료를 마련하고자 수행되었으며 그 결과는 다음과 같다. 저장온도를 달리한 콩으로 두부를 제조한 후 품질특성을 조사한 결과, 5℃에서 8개월 저장된 콩으로 제조된 두부는 저장초기에 제조된 두부의 품질과 거의 차이가 없었으나 25℃와 35℃에서 8개월 저장된 콩으로 제조된 두부의 경우, 일반성분 중 회분의 함량이 다소 높았으며, 두부의 수율과 보수력 및 Sag값(부풀음성)은 감소되었다. 조직감에 있어서 부서짐성은 증가되었으며 견고도, 응집성, 부착성, 탄성, 껌성 및 씹힘성은 감소하였다. 기계적 색도 측정에서는 명도와 황색도의 감소와 적색도의 증가현상을 보였고, 관능검사 결과에서도 색택, 조직감 및 맛에 있어서 유의적으로 낮은 평점을 보였다. Hwangkeum Kong was stored at 5℃, 25℃ and 35℃ for 8 months to investigate the changes of the suitability for Tofu processing. The properties of Tofu prepared with the soybeans stored at 5℃ for 8 months showed no significant differences from the non-stored control soybeans. However, soybeans stored under high temperatures showed low yield, water holding capacity and Sag value of Tofu Compared with the soybeans stored at 5℃ for 8 months, fracturability in the texture of Tofu significantly increased when the soybeans had been stored at 25℃ and 35℃ for 8 months, while hardness, cohesiveness, adhesiveness, elasticity, gumminess and chewiness decreased. The colour of Tofu changed from pale yellow to brown depending on high temperature and long-term of storage. The Tofu prepared with the soybeans stored under high temperatures was significantly different in sensory evaluations from the non-stored soybeans as well as from the soybeans stored at 5℃ for 8 months in color(p<0.01), texture(p<0.05) and taste(p<0.05).
이현자 ( Hyun Ja Lee ),박세진 ( Se Jin Park ) 한국감성과학회 2002 춘계학술대회 Vol.2002 No.-
The purpose of this study was to find out the relationship between sleep physiological signals data and subjective feeling of sleep quality. Sixteen subjective were investigated and they slept on both comfortable mattress and uncomfortable mattress. Information of sleep stage is one of the most important clues for sleep quality. Polysomnography is basically the recording of sleep. The several channels of brain waves (EEG), eyes (EOG), chin movements (EMG) and heart (ECG) were monitored. Sixteen subjects spent 6 days and nights in the laboratory and the data of sleeping 7h for each of 3 nights was analyzed. Percentage of deep sleep (III and IV, sleep efficiency, WASO, stage 1 and subjective feeling of sleep quality were significantly affected with mattress types (comfortable and uncomfortable mattress). When subjects slept on comfortable beds, percentage of deep sleep and sleep efficiency were higher than those of uncomfortable bed. The percentages of wake after sleep onset and stage 1 were lower when subject slept in a comfortable bed. The subjective feeling of sleep quality agreed with the recorded sleep data also.
DEVELOPMENT SYSTEM TO SELECT A SUITABLE MATTRESS FOR BODY TYPES
Hyun-Ja Lee(이현자) 대한인간공학회 2007 대한인간공학회 학술대회논문집 Vol.- No.-
The purpose of this study is to develop a system of suitable mattress selection for body types and to investigate the relations between spinal curvature, body pressure distribution and body type on suitable and unsuitable mattresses. In this study eighteen mattresses were tested with 214 subjects including teenagers. Spinal curvature and contact pressure in a lying position were measured along with subjective ratings of the experimental mattresses. The individually favored mattresses were found by figuring out the spinal curvature most similar to that when standing and comparing this with the spinal curvature on a bed with different levels of firmness. In the teenager group there was a wide difference between the distribution of back pressure and the distribution of hip pressure in comparison to the adult group. Finally it was found that suitable mattresses could be found using the relations between spinal curvature, body pressure distribution and body type.
감마선 조사된 녹즙의 In vitro 유전독성학적 안전성 평가
이현자(Hyun-Ja Lee),강근옥(Kun-Ok Kang),육홍선(Hong-Sun Yook) 한국식품영양과학회 2001 한국식품영양과학회지 Vol.30 No.6
녹즙의 위생화와 저장ㆍ유통 안정성 확보를 위해 10 kGy 감마선 조사된 녹즙(돌미나리, 당근, 케일 및 신선초)의 유전독성학적 안전성 검증의 일환으로 Salmonella typhimurium 균주를 이용한 복귀돌연변이 실험과 Escherichia coli PQ37 균주를 이용한 SOS chromotest 및 CHL 세포를 이용한 염색체 이상시험을 수행하였다. 10 kGy로 감마선 조사된 녹즙은 위 세가지 in vitro 유전독성시험을 한 결과, 음성을 나타내었다. 결과적으로 10 kGy로 조사된 녹즙은 어떠한 돌연변이도 유발시키지 않았으며 감마선 조사된 녹즙이 in vitro에서 유전독성학적으로 안전하였다. Genotoxicological safety on 10 kGy-gamma irradiated vegetable juices such as Oenanthe stolonifera DC., Daucus carota L., Brassica oleracea var. acephala and Angelica keiskei was determined by the Salmonella typhimurium reversion assay, the SOS Chromotest using in Escherichia coli PQ37 and chromosome aberration test in cultured Chinese hamster lung (CHL) fibroblast cells. Vegetable juices exposed to 10 kGy-gamma ray revealed negative results in these three in vitro mutagenetic tests.
活性炭에 依한 Hg( II )이온의 吸善에 관한 調査硏究( 1 )
李賢子(Hyun Ja Lee),李鍾漢(Jong Hang Lee),尹旿燮(0 Sub Yun) 한국환경보건학회 1988 한국환경보건학회지 Vol.14 No.2
In thís study, the method of adsorptíon by activated carbon ín the removal of Hg(lI) íon ìn waste water was treated , Tle ínfluence of kinds of actívated carbon and effect of temperature and the ínfluence of coexistent salt on adsorptíon rates, the ínfluence of pH ín the adsorptíon, equilibrìum and adsorption of mercury from activated carbon were ínvestigated. From the adsorption on activated carbon of mercury(lI) íon in the presence of cyanide or thiocyanate ion was found that mercury(I1) was easily adsorved onto the activated carbon ín the form of complex anion such as Hg(CN)r, Hg(SCN)r respectively. ZnC12 activation method had a higher adsorptive ability than steam actívation method ín adsorptìon of Hg on activated carbon. Activated carbon adsorbed iodide ion is very effectíve on adsorption of Hg.