• 한국식품저장유통학회지
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• 제18권1호
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• pp.1-6
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• 2011

고추장굴비의 지방산패를 최소화하기 위하여 신선굴비를 동결건조한 굴비포를 사용하여 고추장굴비를 제조하고 비열처리 살균방법으로 초고압과 감마선 처리하여 저장 중에 품질과 미생물변화를 분석함으로서 고추장굴비의 저장과 유통기간 연장 가능성을 검토하였다. 초고압처리(200, 400, 600 MPa) 및 감마선 조사(7, 10, 20, 30 kGy) 후 pH 변화는 유의적으로 차이가 없었으며 20일 동안 상온에서 저장 중에도 시료간의 유의적인 변화를 보이지 않았다. 색도는 Hunter L값과 b값은 증가하는 경향을 보였으며 a값은 감소하는 경향을 보였으나 외관상 품질에 영향을 미칠 정도는 아니었다. 휘발성 염기질소 대조구와 처리구에서 저장 중 경시적으로 증가하는 현상을 보였으나 초고압처리 압력이 높을수록, 감마선 조사강도가 높을수록 유의적으로 현저히 낮은 증가율을 보였다. TBA값은 모든 시료에서 시간이 경과함에 따라 증가량의 차이는 있으나 증가하는 경향을 보였으며, 초고압 처리하지 않은 경우 초기 0.6 mg/g 수준에서 20일 저장 후 4.2 mg/g 수준으로 높은 증가율을 보였으며, 600 MPa 처리구와 30 KGy 처리구의 경우 각각 1.2mg/g과 1.5 mg/g 수준으로 현저하게 낮은 값을 보였다. 초고압처리에 의한 호기성 생균수 감소효과는 다소 낮은 편이었으며 10 kGy 이상의 방사선 조사에 의해 효과적으로 미생물 수를 감소시켰다. 특히 30 kGy 처리구의 경우 20일 동안 저장 후에도 검출되지 않아 멸균효과를 얻을 수 있었다. 고추장 굴비 대중화를 위해서 진공포장이 기본적으로 요구되며, 초고압처리 방법은 단기적인 유통기한 연장효과를 기대할 수 있으며 장기적인 효과를 위해서는 감마선 조사가 적합할 것으로 판단된다.

• 한국재료학회지
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• 제20권5호
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• pp.278-288
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• 2010

High Pressure High Temperature (HPHT) treatment can significantly change the color of diamonds. We studied the variation of the optical properties according to the nitrogen arrangement in natural brown diamonds of various types (type IaAB, type IaB, type IaA > B, type IaA < B, IaA = B) after HPHT treatment. The diamonds with different arrangements of nitrogen were annealed at temperatures in the range $1700-1800^{\circ}C$ under a stabilizing pressure of 5 GPa. HPHT treated samples were analyzed using UV-Vis-NIR, FT-IR, and PL spectroscopy. The absorption and luminescence spectra were measured to compare the variations of nitrogen arrangement in the natural brown diamonds before and after HPHT treatment. After HPHT treatment, the brown coloration in all types of diamonds was reduced and a decrease in the peaks related to the A-aggregate of nitrogen was more predominant than the B-aggregate. Furthermore, the peaks related to N3 (415.4 nm), H4 (496.4 nm), and platelet decreased and the peaks related to H3 (503.2 nm) and G-band increased after HPHT treatment. In conclusion, spectroscopic analysis of natural brown diamonds after HPHT treatment showed that a yellow color was produced by absorption in the H3 centers and a green color was generated by interaction between absorptions of the H3 and H2 centers.

• 한국염색가공학회지
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• 제9권2호
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• pp.10-16
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• 1997

Merino wool top and fabric have been treated with steams such as superheated steam or high pressure steam. Moisture regain, water absorbency, water penetration, zeta potential, ESCA, SEM, and dyeing behavior were studied. Negative electric potential on the surface of wool fibers by steam treatment became higher than untreated. From the results of ESCA measurement, intensity of $O_{1s}$ was increased by steam treatment. Rate of dyeing and saturation dye exhaustion of wools increased by steam treatment, especially high pressure steam treatment. Moisture regain, water absorbency, water penetration, and surface appearances by SEM photographs of the steam-treated wools didn't change. There is no relationship between dyeing of the steam-treated wool and wettability to water. Therefore It seems likely that relaxation of adhesive filler in interscale of wool by steam treatment accelerate dye penetration into the fiber.

• E2M - 전기 전자와 첨단 소재
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• 제8권4호
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• pp.504-508
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• 1995

The purpose of this research is to study on characteristics of corona ignitor which was designed for ignition of plasma, used at hard coating, surface treatment and thin film preparation, at high pressure. Corona ignitor composed of hollow type inner electrode and ring type external electrode. Though corona voltage increased with increasing distance between electrodes, corona discharge can be controlled stably. The gas flow in hollow type inner electrode and the construction between electrodes affect a length of corona flame and corona phenomenon. It is possible to ignite the . plasma, usually generated at low pressure(10 Torr), at high pressure(100 Torr) by corona ignitor.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.57.6-57
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• 2002

Recently, the seriousness of the high blood pressure appearing in the whole world as well as Korea. Therefore, the methods to treat this disease proposing. For exam pie, there are the medicinal therapy and the dietetic treatment, etc. But these are uncertain and produce an adverse reaction. Thereupon, we studied effectively and financially to execute the treatment of the high blood pressure based on oriental medicine. Oriental medicine includes many treatments. We used Meridian Theory, the Meridian point, and Acupuncture that are a part of oriental medicine and treatments. And actualizing the above explained treatment into electronic technique, we produced the same effect without the help of...

• 한국농공학회지
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• 제45권2호
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• pp.126-137
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• 2003

The feasibility study of UV-disinfection system was performed for disinfection of effluent from wastewater treatment plant. Three low-pressure UV lamps of 17, 25, and 41 W were examined with various flow rates. Low-pressure UV lamps of 17W were examined with various turbidity, DOM (dissolved organic matter), and SS (suspended solid). The pilot plant was a flow-through type UV-disinfection system, and the range of exposure time varied from 5 to 40 seconds, turbidity from 0 to 40 NTU, DOM from 0 to 30 mg/L, and SS from 10 to 40 mg/L. The 41W lamp demonstrated complete disinfection showing no survival ratio in all the experimental conditions, and generally 17W and 25W lamps also showed high removal ratio over 97%. For the same UV dose (UV intensity times exposure time), high intensity-short exposure conditions showed better disinfection efficiency than low intensity-long exposure conditions. While the effects of turbidity and DOM were not apparent, the effects of SS was significant on the disinfection efficiency which indicates that SS control before UV-disinfection appears to be necessary to increase removal efficiency. Considering characteristics of effluent from existing wastewater treatment plants, cost-effectiveness, stable performance, and minimum maintenance, the flow-through type UV-disinfection system with high intensity and low-pressure lamps was thought to be a competitive disinfection system for wastewater reclamation.

• 한국식품과학회지
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• 제32권1호
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• pp.111-116
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• 2000

전통식품인 저염젓갈을 대상으로 비열처리방법인 초고압가공법을 적용하여 미생물 살균효과와 품질변화를 측정하였다. 멸치젓의 생균수는 $20^{\circ}C$에서 처리압력의 증가에 따라 서서히 감소하다가 처리압력을 400MPa로 증가시켰을때 급격히 감소하였고, 300 MPa에서 처리온도를 $50^{\circ}C$로 증가시켰을 경우에는 7배 이상 감소되었으며, 처리시간의 증가에 따라 급격히 감소되었다. 과산화물가는 처리압력, 온도, 시간의 증가에 따라 증가하였는데, 그 중 처리온도가 가장 큰 영향인자였다. TBA가는 초고압 처리 전후에 약 2배 이상 증가하여 그 변화 폭은 컸으나, 처리조건에 따른 변화는 적었다. VBN은 초고압 처리 전후와 처리조건에 따라 다소 증가하거나 감소하였으나 거의 비슷하였다. 아미노태질소 함량은 온화한 초고압 처리조건에서는 변화가 적었으나, 처리온도, 압력, 시간의 증가에 따라 증가하였는데, 처리온도에 따른 증가폭이 가장 컸다. 이상의 결과로부터 젓갈의 위생적 안정성을 유지하면서 품질 향상을 위해서는 가능한 낮은 온도와 압력 조건에서 처리시간을 증가시킬 필요가 있었는데, 이를 고려하여 볼 때 젓갈의 최적 처리조건은 $20^{\circ}C/300\;MPa/15\;min$이었다.

• 열처리공학회지
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• 제13권3호
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• pp.143-150
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• 2000

Ferritic plasma nitrocarburising was performed on pure iron using a modified DC plasma unit. This investigation was carried out with various gas compositions which consisted of nitrogen, hydrogen and carbon monoxide gases, and various gas pressures for 3 hours at $570^{\circ}C$. After treatment, the different cooling rates(slow cooling and fast cooling) were used to investigate its effect on the structure of the compound layer. The ${\varepsilon}$ phase occupied the outer part of the compound layer and ${\gamma}^{\prime}$ phase existed between the ${\varepsilon}$ phase and the diffusion zone. The gas composition of the atmosphere influenced the constitution of the compound layer produced, i.e. high nitrogen contents were essential for the production of ${\varepsilon}$ phase compound layer. It was found that with increasing carbon content in the gas mixture the compound layer thickness increased up to 10%. In the gas pressure around 3 mbar, the compound layer characteristics were slightly effected by gas pressure. However, in the low gas pressure and high gas pressure, the compound layer characteristics were significantly changed. The constitution of the compound layer was altered by varying the cooling rate. A large amount of ${\gamma}^{\prime}$ phase was transformed from the ${\varepsilon}$ phase during slow cooling.

• Journal of Acupuncture Research
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• 제33권4호
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• pp.33-38
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• 2016

Objectives : To identify potential correlation between patients' expectations and clinical outcome in a randomized control study of acupuncture. Methods : In a clinical trial of acupuncture for hypertension, 60 participants with pre and mild hypertension were randomized into an acupuncture group and a control group. After randomization, all participants were asked to rate their expectation for the intervention on a scale of 0 to 10. To analyze the effect of expectation on clinical outcome, change of blood pressure was compared between high and low expectation groups. Results : There was no significant difference of baseline blood pressure between low expectation group and high expectation group. Proportion of acupuncture group and control group was also not different between low and high expectation groups (p = 0.638). The change of systolic blood pressure was -1.55 mmHg in low expectation group and -3.07 mmHg in high expectation group, and it was not significantly different (p = 0.54). There was no significant difference in the change of diastolic blood pressure between two groups (p = 0.58), with -3.24 mmHg in low expectation group and -2.34 mmHg in high expectation group. Conclusion : In this study, the expectation of intervention (including acupuncture treatment) was not associated with the effect of intervention.

• Bulletin of the Korean Chemical Society
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• 제16권11호
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• pp.1084-1088
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• 1995

A complete solid solution (SrLaAl1-xNixO4) between insulating SrLaAlO4 and metallic SrLaNi(Ⅲ)O4 oxides were prepared under high oxygen pressure (1.5 kbar, 800 ℃). They have tetragonal K2NiF4-type structure in all the solid solution range. Compared with lattice parameters of the same solid solution prepared under normal condition (1 bar, 1200 ℃), large decrease in the c-parameter was induced by high pressure treatment while no noticeable variation of the a-parameter was observed. Although marked changes of structural parameters, magnetic susceptibilities, and electron paramagnetic resonance spectra were consistently occurred before and after x=0.5, overall behaviors were essentially the same with those of solid solution prepared under normal condition. Such a phenomenon is explained by assuming the formation of partially filled narrow σ*x2-y2 band for x>0.5. Lattice contraction along the c-axis by high pressure treatment seems not to broaden this band. Particularly, the continuous absorption characteristic of a high free carrier concentration for x>0.5 and the absence of Ni-O in-plane stretching mode in the infrared absorption spectra supports this picture. However, the conductivities increasing with temperature for all solid solution suggest that some localization character, of probably Anderson type, remains for x>0.5.