• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.21 no.8
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• pp.433-438
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• 2009

Experimental results for performance characteristics of small $NH_3$ absorption chiller/ heater are presented. The apparatus consists of 7RT water-cooled absorption system, solution pump, boiler, cooling tower and peripheral devices. The effect of experimental parameters, such as refrigerant mass flow rate, solution mass flow rate and cooling water temperature have been investigated in view of the system performance. The capacity of each heat exchanger increased as refrigerant mass flow rate increased in cooling mode. Also, a cooling capacity increased as a strong solution mass flow rate increased. The cooling and heating COP show 0.5, 1.5 regardless of refrigerant mass flow rate, respectively. The results focus on the evaluation for performance characteristics of system with respect to variation of refrigerant mass flow rate under standard design conditions.

• Proceedings of the Ginseng society Conference
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• 1993.09a
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• pp.132-137
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• 1993

Several Prosapogenins and sapogenins obtained by acid hydrolysis or alkaline cleavage of Korean red ginseng saponins were separated and identified by spectral and physical methods. Some of these degradation products showed the cytotoxic activities against various cancer cell lines, that is, A549, SK - OV - 3, L121O, P388 and K562. The significant difference of activity between stereoisooers was not approved and the activity was inversely proportional to the number of sugars binding to sapogenins. It was clear that diol type prosapogenins and sapogenins were more cytotoxic than triol type ones.

• Korean Journal of Food Science and Technology
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• v.49 no.3
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• pp.265-273
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• 2017

In this study, the effect of nuruk prepared from rice with different degrees of milling on the physicochemical and sensory qualities of yakju after accelerated aging was investigated. The results indicated significant differences, except for Fe and Mn contents, in the qualities of aged yakju prepared using nuruk from rice with different degrees of milling. However, the degree of milling of rice did not influence the quality of yakju, except for amino acidity and pH, which significantly decreased as the degrees of milling increased. In addition, as compared to before aging, brownness ($A_{430}$) and color difference significantly increased after aging in all the treatments. The intensity of off flavor in yakju after aging made from 0% milled rice nuruk was the lowest.

• Korean Journal of Pharmacognosy
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• v.47 no.2
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• pp.179-185
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• 2016

Ginger (Zingiber officnale Roscoe, Zingiberaceae), which is a well-known food seasoning, has been used as a traditional medicine for the treatment of gastrointestinal disorder, vomiting and cough in Korea, China and Japan. Ethanol extract from the dried ginger (DG) was successively partitioned as methylene chloride, ethyl acetate, n-butanol and $H_2O$ soluble fractions. Among those fractions the ethyl acetate soluble fraction (EDG) showed the most potent DPPH radical scavenging and superoxide quenching activities. To know the effect of antioxidant activities of EDG, we tested the activities of superoxide dismutase (SOD) and catalase together with oxidative stress tolerance and intracellular ROS level in Caenorhabditis elegans. To investigate whether EDG-mediated increased stress tolerance was due to regulation of stress-response gene, we quantified SOD-3 expression using transgenic strain including CF1553. Consequently, EDG elevated SOD and catalase activities of C. elegans, reduced intracellular ROS accumulation in a dose-dependent manner. Moreover, EDG-treated CF1553 worms exhibited significantly higher SOD-3::GFP intensity.

• 한국신재생에너지학회:학술대회논문집
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• 2007.11a
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• pp.581-584
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• 2007

(HFC(hydrofluorocarbon, 수소불화탄소)는 오존층 파괴 지수가 낮기 때문에 CFC(chlorofluorocarbon)의 대체 물질로 냉매와 발포제로 널리 사용되고 있는 물질이다. 하지만 HFC는 지구온난화 지수가 높은 기체이므로 대기중으로 방출되는 것을 막기 위해 분리/회수하여 재활용하는 것이 중요하다. 본 연구에서는 공기와 HFC의 혼합기체로부터 HFC만을 분리해 내는 방법으로 가스 하이드레이트 형성법을 제안하였다. 이 방법의 열역학적 타당성을 검증하기 위하여 질소+HFC-134a 혼합기체에 대하여 275-285 K의 온도 범위와 1-27 bar의 압력범위에 걸쳐서 가스 하이드레이트 상평형을 측정하였다. 질소는 가스 하이드레이트를 형성하기 위하여 0 $^{\circ}C$에서 150 bar 이상의 높은 압력이 필요한 반면 HFC-134a는 대기압에 가까운 낮은 압력이 필요하다. 두 기체의 평형 압력의 차가 크다는 것은 가스 하이드레이트 형성법을 이용할 경우 기체의 분리 효율이 매우 높다는 것을 나타낸다. 그리고, 본 실험을 통해서 얻어진 혼합기체의 하이드레이트상(H)-액상($L_W$)-기상(V)의 3상 평형선이 순수한 HFC-134a의 3상 평형선에 가깝게 위치하였다. 이는 가스 하이드레이트를 이용한 분리법이 낮은 압력에서 운전될 수 있음을 나타낸다. 이 분리법은 낮은 압력에서 운전되어 경제적일 뿐만 아니라 물 이외의 다른 매개체를 사용하지 않기 때문에 환경 친화적인 공정이라 할 수 있다.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.1 no.2
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• pp.164-180
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• 1991

For the purpose of contributing to the promotion of health of the employees working at the same kind of department store or similar type of business and the people utilizing them and preparing the basic data for the establishment of mangagement measure by assessing the level of air pollusion at indoor and outodoor of four department store among the distribution service business in Pusan area, authors measured the concentration of sulfur dioxide, nitrogen dioxide, formaldehyde and total suspanded particle according to the measuring height of variable at indoor and outodoor from Aug. 1990. to sep. an. d Jan, 1991 to Feb.: for each two months in summer and winter, and studied by dividing the variable factor into atmospheric factor (temperature, humidity and air velociy) The results are as follows ; 1. The mean concentration of air pollutants at indoor to total subjects was nitrogen dioxide 31.1ppb, sulfur dioxide 51.7ppb, formaldehyde 162.lppb and total suspanded particle $67.7{\mu}g/m^3$, and it was higher in winter than in summer (P>0.05) 2. The mean concentration of formaldehyde to total subjects was higher indoors than outdoors (P<0.001), in case of nitrogen dioxide there was no significant difference and sulfur dioxide and total suspanded particle were higher outdoors than indoors (P<0.05) 3. The concentration of nitrogen dioxide and sulfur dioxide proved to be a adverse correlation, reducing with height. 4. According to the result questioned about the exposure concentration of pollutant and the general symptom caused by the pollutant, nitorgen dioxide and symptom proved to be a positive correlation (P<0.09).

• Radiation Oncology Journal
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• v.2 no.2
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• pp.191-202
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• 1984

Biological behavior and treatment results of 33 patients with Adenoid Cystic Carcinoma (ACC) in the Head and Neck at Yonsei Cancer Confer for 10 years between 1971 and 1980 were retrospectively analysed. Most common, primary site was minor salivary glands such as maxillary sinus, nasal cavity and base of tongue. The typical biological behavior of these tumors was very slowly in growth with long time of duration(mean 19 months) from 1 month to 10 years and more frequent of nerve invasion but rare invasion of neck nodes. Local control and failure pattern in the results of treatment, 16 of 17 patients with irradiation alone were seen complete or partial response but 5 cases of locoregional recurrence, 2 cases of failure of neck node and 4 cases of distant metastasis as lung and brain. On the other hand, among 10 cases of surgery and postoperative irradiation, 2 cases of locoregional failure and 3 cases of distant metastasis as lung and bone. 2 of 4 cases with surgery alone were recurred within primary site. Actuarial overall NED survival at 3 ana 10 years were $52.6\%$ and $42.8\%$, respectively. Survival rate of 10 Patients with surgery and Postoperative irradiation was more high than 17 Patients of radiation alone. Therefore, we have known that surgery with postoperative adjunctive irradiation is most effective treatment modality of adenoid cystic carcinoma in the head and neck. Primary site, treatment modality and with or without nerve ana bone invasion have influenced on prognosis.

• Korean Journal of Soil Science and Fertilizer
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• v.12 no.1
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• pp.43-46
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• 1979

Curing the studies on the mechanism of the nodule formation and the infection of rhizobia using the continously cultured plant cell tissues, it was found that some calluses possess high nitrogen fixation activity. This experiment was conducted to know the differences among the calluses and the Rhizobia. The results obtained were as follows; 1) In a single inoculation the nitrogenase activity of soybean cell cultures-rhizobium was moderately higher than non-leguminous cell cultures, however, in the mixing inoculation that was reversely found. 2) Host factor, which was characteristics for the nodule formation and the nitrogenase activity, was not appeared generally in the plant cell cultures except for Kuamusume and Toyozuzu in soybean, and Datura in non-leguminous cell cultures. 3) In the 012 rhizoblium cultured on soybean cell cultures and in the 010, 023 and 024 rhizobia cultured on non-leguminous cell cultures the nitrogenase activity higher than the others.

• Korean Journal of Clinical Laboratory Science
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• v.44 no.3
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• pp.103-111
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• 2012

Low-Density Lipoprotein cholesterol (LDLC) is the most important marker for the treatment of hyperlipidemia in NCEP-ATP III(National Cholesterol Education Program-Adult Treatment Panel III) guideline. Therefore, LDL cholesterol is pathologically meaningful, accurate measurement should be a top priority. Currently, LDLC is directly measured in most cases, but, the estimate is still used in mass health examination or screening test. This study is about the comparison of LDL-Cholesterol direct measurement with the estimate using various formula (Friedewald: [LDL-F=TC-HDL-TG/5], Nakajima: [LDL-N=TC-HDL-TG/4], Hattori: [LDL-H =0.94TC-0.94HDL-0.19TG], Puavilai: [LDL-P=TC-HDL-TG/6], Carvalho: [LDL-C=3(TC-HDL)/4]) for calculating more accurate value. We analyzed total cholesterol (TC), try-glyceride (TG), high-density lipoprotein cholesterol (HDLC), and LDLC levels of 210 subjects between June and November in 2011. Until now, the Friedewald formula is the most commonly used estimate for the LDLC. When Friedewald formula was applied, the correlation coefficient (r) was 0.940, showing high correlation. But, the result of the direct method was significantly different, compared with those of the Friedewald formula in triglyceride levels ${\geq}400mg/dL$(p<0.05). There was the highest correlation when we used LDL-P formula(r=0.947) in triglyceride levels <400 mg/dl. Also there was the lowest mean difference regardless of triglyceride level. Therefore, the study showed that TG/6 is more precise means of calculation than TG/5. On the other hand, the calculation of LDL-Cholesterol was underestimated, compared with direct measurement. It is necessary to have more data and modified Friedewald formula should be used for the accurate calculation.

• Korean journal of food and cookery science
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• v.21 no.1 s.85
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• pp.33-39
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• 2005

The present study was carried out to develop sausage using Leuconostoc citreum which was isolated from Kimchi. Leuconostoc citreum was added to sausage at three concentrations of 1, 3 and $5\%$, and was stored at $10^{\circ}C$ for 40 days. The pH of the sausage containing Leuconostoc citreum was similar to the control group. The TBA value of the group containing Leuconostoc citreum was lower than the control group. However, the TBA value of the control group steadily increased after 10 days of storage, and there were only minor changes in the groups containing Leuconsostoc citreum. In addition, the TBA value of the sausages employed for the present study was either 0.46MA mg/kg or less than that over the entire period of storage. The residual nitrite value was 47.1 ppm at the beginning of the storage in the control group and was 32.5, 32.2 and 30.9 ppm in the groups containing Leuconostoc citreum. The sausages with TBA values higher than 70 ppm are not permitted in Korea. With regards totexture characteristics, it was observed the hardness was lower in the groups containing Leuconostoc ctireum than in the control group while springiness was almost the same in both the groups, but the group containing $1\%$ Leuconostoc citreum showed the best springiness. Both gumminess and brittleness were lower in the groups containing Leuconostoc citreumthan than in the control group. It was inferred that with an increase in the concentration of Leuconostoc citreum there was a decrease in the value of gumminess and brittleness. The results of the sensory evaluation were generally better in the groups containing Leuconostoc citreum than the control group. The sausage containing $3\%$ Leuconostoc citreum obtained the most excellent scores.