• Journal of Electrochemical Science and Technology
• /
• v.15 no.2
• /
• pp.276-290
• /
• 2024

A study of the transition from transitory state to steady state in DSSCs based on natural dyes is presented; cochineal was used as dye and Li⁺, Na⁺, and K⁺ were the ions added to the electrolyte. The photocurrent profiles were obtained as a function of time. Several DSSCs were prepared with different cations and their role and the transitory-to-steady transition was determined. A novel hybrid charge carrier source model based on the Heaviside function H(t) and the Lambert-Beer law, was developed and applied to analysis of the transient response of the output photocurrent. Additionally, the maximum effective light absorption coefficient α and the electronic extraction rate κ for each ion were determined: ${\alpha}_{Li^+,Na^+,K^+}\,=\,(0.486,\,0.00085,\,0.1126)\,cm^{-1}$, and also the electronic extraction rate ${\kappa}^{Li^+,Na^+,K^+}_{ext.}\,=\,(1410,\,19.07,\,19.69)\,cm\,s^{-1}$. The impedance model using Fick's second law was developed for carrier recombination to characterize the photocurrent.

• The Korean Journal of Mycology
• /
• v.25 no.2 s.81
• /
• pp.152-160
• /
• 1997

In order to compare collected strains of Naematoloma sublateritium, electrophoretic isozyme and RAPD band patterns of DNA from mycelia were studied. The two characteristics of the strain, ASI 11010 were much different from those of ASI 11005 and 11006. These patterns may be used as valuable criteria for identifying strains of N. sublateritium. Optimal conditions on the vegetative growth of N. sublateritium using sawdust media were favourable on alder sawdust media added with 30% beer waste. Optimal water content was 70%.

• Journal of Mushroom
• /
• v.14 no.2
• /
• pp.34-38
• /
• 2016

This study was performed to determine most appropriate mixed ratio of brewers dried grain to wheat bran as a nutrient supplement in the plastic vinyl bag cultivation of Grifola frondosa. In the examination of an appropriate nutrient source, the IV substrate formulation (80 : 10 : 10, oak sawdust : wheat bran : brewers dried grain) resulted in 71.6 days to harvest and the highest yield of 142.6 g/bag. On the other hand, the investigation of the optimal mixing ratio of beer waste to wheat bran showed that the III substrate formulation (80 : 5 : 15, oak sawdust : wheat bran : brewers dried grain) resulted in the least days to harvest (61.8 days), with the highest yield of 140.8 g/bag.

• Journal of the East Asian Society of Dietary Life
• /
• v.13 no.6
• /
• pp.527-541
• /
• 2003

The purpose of this study was to investigate food preferences and dietary habits of university students in Kyungbuk province. We assessed anthropometric measurements, food preferences, and dietary habits of seventy nine male and sixty nine female students at K university. The results of this study were analyzed with $\chi$$^2$, t, and ANOVA test using SPSS package program. The percentages of students who were underweight, normal and overweight by body mass index (BMI) were 18.0, 22.1, and 27.7 for males, and 17.8, 21.7, and 28.7 for females, respectively. Preferences for noodles with bean sauce, bread (castella, red-bean bread), beef, pork, chicken, ham, garlic, milk soy bean milt carbonated drink ionic beverages, bun (fried, steamed), croquette, soju(alcohol) and tobacco were higher in males than females, but preferences for tangle, strawberry and orange were lower in males than females. Males did not skip meals compared to females, and ate more meat fat than females. Males exercised more frequently and longer than females. Eighty six point eight percent of females and 69.7% of males were dissatisfied with their weights, and females attempted the weight control more than males. Preferences for bibimbab(boiled rice with assorted mixtures), ionic beverages, and beer were shown higher in overweight males than in normal ones and preference for red fish, hamburger, and chocolate were higher in underweight females than overweight ones. Overweight females skipped meals more and ate more meat fats than normal weight ones. Normal weight males and underweight females were satisfied with their weight. The results of this study suggest that university students need more nutritional education, and modification of dietary habits based on food preference to prevent and treat obesity and to maintain their health.

• Korean Journal of Soil Science and Fertilizer
• /
• v.17 no.1
• /
• pp.51-54
• /
• 1984

Fermentation waste from beer production was applied to a newly developed upland soil to evaluate the effect of lime added sludge on corn growth. The mineralization of lime added sludge was faster than that of raw sludge without lime treatment in the upland condition. It was accelerated by low C/N ratio and high lime content in the lime added sludge. The plant growth and yields of corn increased as the sludge application rate increased and so was nitrogen and organic matter contents in soil. Ammonium volatilization is considered to be high in the lime added sludge and thus the raw sludge is more promising as an organic sources.

• Journal of Preventive Medicine and Public Health
• /
• v.32 no.3
• /
• pp.374-382
• /
• 1999

Objectives: Organizational culture has beer important in field of organizational behavior research for the past decade. Although there has been a growing interest in the organizational culture and organizational effectiveness, there is few research in health care field. This study was carried out to investigate the relationship of organizational culture and organizational effectiveness at general hospital. Methods: Data was collected by self-administrated questionares. Organizational cultures were measured by using Likert scale. A general hospital in Kyunggi-Do was selected and survey was conducted to 675 workers. Data was analyzed with computer package, PC-SPSS. Results: There were four types of organizational culture in this hospital consensual culture, developmental culture, hierarchical culture, rational culture. Many workers recognized their culture as rational culture and developmental culture. This finding showed that the hospital had both human related and task related climate. There were some differences in recognition of sub-organizational culture by occupational group, but perceived organizational culture was in accordance with sub-organizational culture in general. Multiple regression analysis and multiple logistic regression analysis were conducted to find the relationship of organizational culture and organizational effectiveness. As a result, developmental culture showed a strong relationship with organizational commitment and job-satisfaction. Conclusions: These results showed that types of organizational culture were significantly related to organizational effectiveness and understanding the existing culture is essential to develope their organizational effectiveness.

• Journal of Sensor Science and Technology
• /
• v.13 no.4
• /
• pp.258-263
• /
• 2004

In this study, we carried out a basic study for the development of optical transcutaneous $pCO_{2}$ gas sensor and analyzer using non-invasive method. The basic principle of $pCO_{2}$ measurement is adapted Beer lambert's law and embodied the system using NDIR method. This measuring system was composed of a IR lamp, a optical filter, a optical reaction chamber, pyroelectric sensor and a signal process. We measured $EtCO_{2}'s$ concentration in basis step instead of $pCO_{2}$ gas that can collect by inflicting heat in outer skin. We minimize the size of optical reaction chamber which takes up the largest volume, to make the portable sensor. We made optical reaction chamber in Si wafer using MEMS technology and the optical reaction chamber was shortened to 2 mm and we carried out an experiment. When we injected the $EtCO_{2}$ to the inside of the optical reaction chamber, we could confirm change of 4.6 mV. The system response time was within 2 second that is fairly fast.

• Science of Emotion and Sensibility
• /
• v.7 no.4
• /
• pp.1-6
• /
• 2004

The purpose of this study was to investigate the female college students' preferences to the images of both western and eastern pictures, and positive/negative perception on to the model's nationality in the apparel advertizing pictures of fashion magazines. 100 students participated in the survey, and 20 stimulus pictures were shown to them. The results were as follows: The female college students preferred the western images than the eastern images in the pictures of bedroom, palace and beer, while they preferred the eastern images in the pictures of snack and famous drawings of a beauty. But they showed more positive attitude to all the western models' advertizement pictures than the eastern models' ones, in casual wear, formal wear, watches and inner-wear divisions except in men's formal wear division. This meant that the perception of female students on western images was positive and it seems stimulating the consumers preferences of brand images.

• The Korean Journal of Food And Nutrition
• /
• v.28 no.1
• /
• pp.73-83
• /
• 2015

The purpose of this study was to investigate the health status and food habits of male college students in Seoul according to drinking habits. In order to identify risk factors, health surveys were conducted from October 2013 to December 2013. Average height, weight, and BMI of subjects were $175.47{\pm}5.27cm$, $67.93{\pm}9.28kg$, and $22.04{\pm}2.67kg/m^2$, respectively. Weight and BMI were higher in the non-drinking groups compared to the drinking groups (p<0.05). Frequency of drinking was 2~3 times per month, and 52.4% of subjects started drinking when starting university. The motivation to start drinking was cited as "From necessity". Reason for drinking was "Social relations". The favorite kind of drink was beer. Rate of taking supplements was 24.4% of the subjects. Vitamin preparations were highest in drinking groups and non-drinking groups (p<0.05). The reasons for skipping meal were "too busy" in the drinking groups, and "oversleep" in the non-drinking groups (p<0.05). The preference for snacking in drinking groups were milk, milk products, and fast food, with the highest being listed first. The non-drinking groups preferred carbonated drinks and ice cream. The drinking groups need more education about their drinking habits. Drinking groups also need an increased intake of vegetables and fruits.

• Proceedings of the Korean Society of Near Infrared Spectroscopy Conference
• /
• 2001.06a
• /
• pp.2101-2101
• /
• 2001

Near-infrared spectroscopy is now being used in clinical diagnosis as a non-invasive monitor of tissue oxygenation state. However, due to lack of the optical pathlength information within tissues, it is still difficult to quantitate the hemoglobin concentration with present CW techniques. Time-resolved spectroscopy (TRS), which measures temporal profiles of emerging light from tissues, enables to estimate the pathlength distribution within tissues by converting time to distance. Consequently, quantitative measurement of tissue oxygenation is possible by analyzing the data with optical diffusion equation 1) or our Microscopic Beer-Lambert law2). Time-Resolved Spectroscopy System : TRS-1O3) Our TRS-10 system consists of a three-wavelength (759, 797, 833 nm) PLP as pulsed light source, a high speed PMT with high sensitivity and three signal-processing circuits for time-resolved measurement (CFD/TAC, A/D converter and histogram memory). Optical pulse train consisting of 759, 797 and 833nm is generated by PLP at 5㎒ repetition rate and irradiated a sample through a single optical fiber. The diffuse-reflected light from the sample is collected by a bundle fiber and then detected by the PMT for single photon measurement. After being amplified by a following fast amplifier, the electrical signals for each wavelength are picked out by CFD/TAC module. Then, a signal processing circuit integrated the TRS data for each wavelength individually. The simultaneous TRS measurement for three wavelengths achieved without any optical or mechanical switch. Experiment and Results Input and detection fibers of TRS-10 were attached at the human forehead with a fiber separation of 3cm. TRS measurements were continuously performed for about 20 minutes including 2 minutes hyper ventilation. It was observed that the total hemoglobin concentration was decreasing during the hyper ventilation and recovered until 2 minutes after hyper ventilation. On the other hand, the deoxy-hemoglobin concentration began to increase after hyper ventilation and had its peak at around 2 minute later, showing 502 drop from 75% to 60% due to inhibition of breathing by performing hyper ventilation. The results showed that this system might be able to quantitate the concentrations of oxy- and deoxy-hemoglobin in the human brain.