• Nuclear Engineering and Technology
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• v.54 no.3
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• pp.826-833
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• 2022

A two-phase natural circulation test using SMART integral test loop (SMART-ITL) was conducted to explore thermo-hydraulic phenomena of two-phase natural circulation in the SMART reactor. Specifically, the test examined the natural circulation in the primary loop under a stepwise coolant inventory loss while keeping the core power constant at 5% of the scaled full power. Based on the test results, three flow regimes were observed: single-phase natural circulation (SPNC), two-phase natural circulation (TPNC), and boiler-condenser natural circulation (BCNC). The flow rate remained steady in the SPNC, slightly increased in the TPNC, and dropped abruptly and maintained in the BCNC. Using a natural circulation flow map, the natural circulation characteristic in the SMART-ITL was compared with those in pressurized water reactor simulators. In the SMART-ITL, a BCNC regime appeared instead of siphon condensation and reflux condensation regimes because of the use of once-through steam generators.

• Composites Research
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• v.20 no.2
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• pp.32-38
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• 2007

Natural fibers can refer to all types of fibres only produced by nature. Their lengths vary from particles to long strands. Natural fibers are categorized roughly by six types, depending on the types of sources; base, leaf, seed, grasses, fruit and wood. Of these fibers, jute, flax, sisal and ramie are the most commonly used as reinforced materials in preparing polymer composites. In development and improvement of these composites, many studies have been implemented to overcome the drawbacks such as incompatibility, moisture problems and so on. The range of industry sectors of natural fiber-reinforced polymer composites becomes more extensive gradually and many of the companies all over the world are engaged in fabrications or applications. This paper mainly discussed the recent status of the domestic/overseas market and research issues of natural fiber-reinforced polymer composites. We made an exception of wood-polymer composites market which have played a great role because they had been often dealt with.

• Journal of the Daesoon Academy of Sciences
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• v.20
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• pp.67-94
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• 2009

Kang Jeung-san whose real name is Kang Il-soon was a Korean born thinker who thought himself as Shangti(上帝). It is told that he made a Great Tour(大巡) upon this world. His thought was affected by Asian traditional philosophy such as Confucianism, Buddhism and Daoism. He founded a religious body, called Jeung-san-Gyo which could be formed a syncretism of East Asian traditional thoughts. We have to survey Asian traditional thoughts in order to understand Kang Jeung-san's religious thinking. According to the Great Tour Scripture(大巡典經), he have read Confucian moral books, holy Sutra of Buddha and the books of Daoism. In the field of Confucianism, he stressed upon the Book of Changes (Zou-yi; 周易). And for Buddhism, he showed great concern on a monk, Jin-mook(震黙) who lived 15th century in Chosun Dynasty. Jeung-san Shangti followed Daoistic way when he performed religious ritual. In case of performance, he was compared as a great Shaman who wanted to save the world. And the most typical ritual was called public business of Heaven and Earth(天地公事). He showed a great scale while he was touring the world in space. The most important thing, however, is to overcome the localization which seems still prevailing doctrine of the Jeung-san thought. For this, the followers of Jeung-san-Gyo should study world philosophy and accept the modernity so as to broaden Jeung-san thought to the rest of the world.

• Journal of the Ergonomics Society of Korea
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• v.26 no.2
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• pp.131-136
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• 2007

In this study, we developed an active ankle-foot orthosis(AAFO) which can control dorsi/ plantar flexion of the ankle joint to prevent foot drop and toe drag during walking. 3D gait analyses were performed on five healthy subjects under three different gait conditions: the normal gait without AFO, the SAFO gait with the conventional plastic AFO, and the AAFO gait with the developed AFO. As a result, the developed AAFO preeminently induced the normal gait compared to the SAFO. Additionally, AAFO prevented foot drop by proper plantarflexion during loading response and provided enough plantarflexion moment as a driving force to walk forward by sufficient push-off during pre-swing. AAFO also could prevent toe drag by proper dorsiflexion during swing phase. These results indicate that the developed AAFO may have more clinical benefits to treat foot drop and toe drag, compared to conventional AFOs, and also may be useful in patients with other orthotic devices.

• Journal of Physiology & Pathology in Korean Medicine
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• v.20 no.1
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• pp.235-244
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• 2006

There is much confusion in the field of Rhinitis regarding how to best measure disease severity objectively, Therefore, we aimed to establish a new adequate scoring system for Rhinitis, that should be based on comparison analysis of various scoring systems. We report as follows. We researched for data relating to severity scoring systems for rhinitis in Entrez PubMed from 1995 to 2005 and in Kiss Kstudy. Results and Conclusions: Properties of severity scoring systems were validity, sensitivity of change and ease of use. The essential items of severity scoring systems were subjective symptoms. The criterion of severity were divided into subjective symptoms and complication and Quality of Life. Intensity items are nasal obstruction, rhinorrhea, sneezing, itching, Postnasal drip, nasal mucosa swelling, nasal mucosa color, complication. Subjective symptoms is difficulty of Life. The significant items of severity scoring system are nasal symptoms. The whole score does with the maximum 30 scores. As it were, we assumed nasal symptoms accounted for around 80% of each total score, with complication and difficulty of Life representing 20%.

• Journal of Acupuncture Research
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• v.23 no.3
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• pp.57-65
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• 2006

Objectives : It is known that the five Su points are very useful clinically. The following study was undertaken in order to find out the general characteristic and the origin of the five Su points. Methods: We investigated the relation of symptoms that are treated by five Su points and Shi-Dong Suo-Sheng-Bing(是動 所生病). The main reference book was Zhen Jiu Jia Yi jing(鍼灸甲乙經) and the author took Liver Meridian of Foot Gworeum(足厥陰肝經) as an example. Results : 1. Five Su point of Liver Meridian of Foot Gworeum(足厥陰肝經) treats Shi-Dong-Bing(是動病) of Liver Meridian of Foot Gworeum. It is peculiarity of Five Su point of Liver Meridian of Foot Gworeum, differed from the others acupoints. Symptoms of Shi-Dang-Bing appears with the abnormal pulsation of Merdian Gi(脈氣), and the special feature of Shi-Dang-Bing is the symptoms are consisted of disorders of whole body, trobles of an internal organ, and psychosomatic disorders. 2. In , it is described the part of pulse feeling for Shi-Dong-Bing(是動病) of Liver Meridian of Foot Gworeum(足厥陰肝經) as ‘A region that is 2 Chon(寸) from the basic digital joint of the first toe’. This region is agree with the acupoint of Liver Meridian of Foot Gworeum in , . And Haeng-gan(行間) Tae-chung(太衝), members of five Su-points of Liver Meridian of Foot Gworeum is situated the same region. So we suppose that the part of pulse feeling for Shi-Dong-Bing of Liver Meridian of Foot Gworeum is transformed into Haeng-gan(行間) Tae-chung(太衝), among the five Su points.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.579-584
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• 2008

A novel nondestructive testing (NDT) system, which is able to detect a crack with high speed and high spatial resolution, is urgently required for inspecting small cracks on express train wheels. This paper proposes an improved signal processing circuits, which uses the multiple amplifying circuits and the crack indicating pulse output system of the previous scan-type magnetic camera. Hall sensors are arrayed linearly, and the wheel is rotated with static speed in the vertical direction to sensor array direction. Each Hall voltages are amplified, converted and immediately operated by using, amplifying circuits, analog-to-digital converters and $\mu$-processor, respectively. The operated results, ${\partial}V_H/{\partial}t$, are compared with a standard value, which indicates a crack existence. If the ${\partial}V_H/{\partial}t$ is larger than standard value, the pulse signal is output, and indicates the existence of crack. The effectiveness of the novel method was verified by examine using cracks on the wheel specimen model.

• Bulletin of the Korean Space Science Society
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• 2008.10a
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• pp.35.2-35.2
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• 2008

The Albedo MONitor and RAdiometer (AMON-RA) instrument system is designed to measure Earth global albedo anomaly over the wavelength range of 0.3um to 4um. The instrument consists of two interconnecting optical subsystems i.e. a visible channel and an energy channel. The energy channel instrument consists of a modified Winston cone, a couple of relay mirrors and a pyro-electric detector. First, we report the integration and alignment process, leading to the prototype bolometer instrument. We then discuss the radiometric performance characterization including laboratory measurement results and the future plan for further incorporation of the bolometer instrument into the prototype AMON-RA instrument.

• Korean Journal of Plant Resources
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• v.33 no.1
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• pp.40-49
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• 2020

The objectives of this study were to evaluate total phenolic content (TPC) and individual phenolic compounds in leaves of perilla genetic resources, assess whether they could be used as distinguishing factor among germplasms, and evaluate their relationship with some quantitative and qualitative morphological characters. TPC and individual phenolic compounds were determined using Folin-Ciocalteu method and UPLC-PDA system, respectively. Wide variations in TPC (7.99 to 133.70 mgGAE/g DE), rosmarinic acid (ND to 21.05 mg/g DE), caffeic acid (ND to 1.17 mg/g DE), apigenin-7-O-diglucuronide (ND to 2.21 mg luteolin equivalent (mgLUE)/g DE), scutellarein-7-O-glucuronide (ND to 5.25 mg LUE/g DE), and apigenin-7-O-glucuronide (ND to 2.81 mg LUE/g DE) were observed. Intensities of green pigment at abaxial and adaxial leaf surfaces were positively correlated with phenolic compounds whereas leaf length and width had negative correlation. Purple pigmented accessions were shorter in leaf length and width but exhibited higher amount of phenolic compounds compared to green pigmented accessions in most cases. Leaf shape was not related with content of phenolic compounds, color of leaves, and length/width of leaves. TPC and individual phenolic compounds along with morphological characters could be useful distinguishing factors for perilla genetic resources.

• Preventive Nutrition and Food Science
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• v.13 no.4
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• pp.286-291
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• 2008

The objective of this study was to investigate the effects of a nutritional education and physical exercise program on obese children (47 boys and 36 girls). The nutritional education and physical exercise program was provided for 6 weeks and dietary habits, nutrient intake and hematological profiles were measured before and after the program. The BMI (body mass index, $kg/m^2$) in male children was significantly reduced to $24.58{\pm}2.81$ from $25.89{\pm}3.27$ (p<0.01) and it was significantly reduced to $24.29{\pm}3.51$ from $25.21{\pm}3.59$ in female children after the completion of nutritional education and exercise program. Body fat in male children was remarkably reduced to $32.69{\pm}7.74%$ after education from $37.38{\pm}9.21%$ (p<0.001). After the program total cholesterol concentration in male children was reduced to $176.48{\pm}29.10\;mg/dL$ from $196.03{\pm}29.10\;mg/dL$, whereas there was no significant difference in females before and after the nutritional education and exercise program. The grasping power of male children (p<0.05) and backmuscle strength of male (p<0.05) and female children (p<0.001) were significantly increased after the exercise program. The nutrient intakes that were different before and after the nutrition education were calories (p<0.05) and carbohydrate (p<0.05) in male children, and a significant increase in intake of vitamin A (p<0.05) was found in female children. There was a significant difference in meal time regularity before and after program. The findings of this study showed that there was a significant decrease in both body fat and weight, in addition to normalization of hematological profiles after the completion of nutrition education and physical exercise programs.