• Proceedings of the KSR Conference
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• 2005.11a
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• pp.1184-1189
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• 2005

Durability of concrete has been currently issued in the engineering societies and a large number of studies on the concrete corrosion in salty environment have been performed. The reinforcement corrosion, which is the primary reason of deterioration of the concrete structure exposed to chloride environment. is caused by the chloride ions infiltration owing to underground water seeping into the concrete. In this study. the endurance periods using the diffusion equation of the concrete specification have been evaluated on the concrete structures with different addictives for the brand new R/C subway structure exposed to seashore underground water. Furthermore. the guidance for proper use of the addictives and the reasonable thickness of concrete cover are derived for concrete mixing. From the result of the evaluation corresponding to salt damage for Inchon subway line I, the endurance periods of the ordinary Portlandcement concretes are represented as $42\~75$ years and fail to achieve the objective period of 100 years. However, the lower water-cement ratio expands the endurance periods and the blast furnace slag concrete with small quantity of the silica fume, which shows the best performance of corrosion resistance in this study, represents more than 170 years of the endurance period. Moreover, the case of use of blast furnace slag and fly ash together shows the endurance period of $134\~171$ years and it means that the result very satisfies the objective endurance period.

• Korean Journal of Oriental Medicine
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• v.15 no.1
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• pp.91-94
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• 2009

Understanding the present condition of Oriental traditional medicine in different country is demanded for the Korean Traditional Medicine to prepare his orientation in future. Also it is not possible to separate the present condition of OTM from history of oriental medicine as a whole. This is valid for the introduction of TCM in the west. The first information have arrived in Europe by the terrestrial and maritime travelers accounts. The diplomatic way, with special reference to Jesuit fathers, has brought cultural and theoretical precise data. The physicians of East India Company and, later, of expeditionary forces, have supplied with practical data. Five periods follow one another: 1) Period when the source reached and are used in Europe. This first step is intimately involved with the use and comparison of similar factor between the two medical systems ; 2) "Discovery" and use of needles ; 3) latent period when techniques coming from acupuncture source were developed ; 4) "Chinese Acupuncture" correctly speaking ; 5) modern period or investigating period, when Eastern and Western people are trying to correlate data of traditional medicine with those of western science. In particular the actual situation from 2000.

• Journal of radiological science and technology
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• v.44 no.3
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• pp.239-245
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• 2021

Since the side effects of contrast agents occur in many ways, hospitals must clearly identify the contrast agents and know how to manage them. Storage of contrast media It is common practice to store contrast media in a warm room to reduce viscosity and improve patient comfort. However, it is important to recognize that long-term storage at high temperatures can shorten the shelf life of a product. Therefore, in this study, the presence or absence of chemical changes according to the storage period after using the contrast medium was analyzed. As the analysis equipment, a 500 MHz Nuclear Magnetic Resonance Spectrometer of Bruker Avance (Germany) possessed by Korea Basic Science Institute (KOREA BASIC SCIENCE INSTITUTE; KBSI) was used. For the X-ray iodide contrast medium, Pamiray contrast medium of Iopamidol and Optiray contrast medium of Ioversol, samples remaining after 7 days, 20 days, 30 days, and 1 year were collected, By acquiring the spectrum from the 1H-NMR spectrometer of the contrast medium stimulated by It was compared and analyzed with the standard sample. In conclusion, depending on the storage period of the contrast medium, no peaks of physical and chemical changes were observed in both the Pamiray contrast medium of Iopamidol and the Optiray contrast medium of Ioversol after 7 days, 20 days, 30 days, and 1 year after use.

• Journal of the Korean Institute of Landscape Architecture
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• v.19 no.1
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• pp.99-121
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• 1991

A purpose of this study is to identify the concept formation and classify the diverse concepts which related to Kyoung(景) in the Classical Korean Poems(Chong, Chol(鄭澈, 1536-1593), Pak, Inno(朴仁老, 1561-1642), Yun Sondo(尹善道, 1587-1671) on the Yi dynasty period and to construct the direction of the use of that concepts in the future. The results were as follows ; The type of landscape concept was 9 types and had the following frequencies in order ; Kyoung(景)(3), Pung-Kyoung(風景)(2), Kyoung-Chi(景致)(2), Yeo-Kyoung(麗景), Cheong-Kyoung(淸景), Jin-Kyoung(眞景)(1), Mo-Kyoung(暮景)(1), Ka-Kyoung(佳景)(1), Kyoung-Mul(景物). Types of landscape concepts in Yi dynasty period were classified into 9 according to the many characteristics ; personal situations, faith, religion, confucianism in the specific time of Yi dynasty. The most popular type of landscape concepts in general was Kyoung(景). The word, "Pung-Kyoung(風景)" was used in expressing personal thoughts and feelings in one's recollection in terms of landscape elements. The word, "Mo-Kyoung(暮 景)" was used in expressing specific time and the dejection in one's heart in that time. The words, "yeo-Kyoung(麗景)" and "Ka-Kyoung(佳 景)" was used in expressing the landscape elements. The nine concepts had a grest deal to do with defining and perpetuating a personal characteristics, the place and landscape elements, and a society's character in the Yi dynasty period.ty's character in the Yi dynasty period.

• Korean Journal of Environmental Agriculture
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• v.33 no.4
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• pp.334-343
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• 2014

BACKGROUND: Shorebirds use a variety of wetlands as their stopover sites to replenish energy and nutrient reserves along the migration route. It is increasingly important to understand how birds use the remaining available habitats during migration period, because shorebird stopover sites are often altered and destroyed. Rice fields serve as a major inland stopover site for migrating shorebirds. However, the information on habitat use patterns of shorebirds in rice fields is very limited in Korea. Therefore, we studied the patterns of shorebird abundance and their habitat use in rice fields during spring migration period in western-central Korea. METHODS AND RESULTS: Surveys were conducted at interval of 2-3 days during the spring migration period of 2014 at rice fields of mid-western Korea. We recorded the location of the observed birds on the rice field map according to the local habitat type. The habitat types were divided by physical structure and cultivation methods. Fifteen shorebird species and 7,852 individuals were recorded during the survey period. The number of shorebird species and their abundance began to increase from the beginning of flooding in late-April, and reached a maximum in early-May. After rice transplantation, the number of shorebird species and their abundance dramatically declined. Shorebirds selectively used paddy and levee rather than road and ditch and most species used shallow depth field type. Plowed field types were less attractive to most species. CONCLUSION: Flooding rice fields were functioned as stopover sites for a variety of shorebird species during spring migration period. Furthermore, these results provide that the appropriate agricultural practices can be improving the habitat quality for shorebirds.

• Journal of the Korea Society of Computer and Information
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• v.8 no.4
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• pp.111-116
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• 2003

We proposed a optimal clock period selection algorithm for low power Register Transfer Level design. The proposed algorithm use the way of maintaining the throughput by reducing supply voltage after improve the system performance in order to minimize the power consumption. In this paper, it select the low power to use pipeline in the transformation of architecture. Also, the proposed algorithm is important the clock period selection in order to maximize the resource sharing. however, it execute the optimal clock period selection algorithm. The experiment result is to set the same result AR and HAL filter on the high level benchmark and to reduce in the case of two pipe stage 10.5% and three pipe stage as many as 33.4%.

• Journal of the Korean Society of Costume
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• v.55 no.6 s.96
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• pp.38-50
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• 2005

A chronological classification of Sangbok(상복) and Sibok(시복) for officers in Joseon Dynasty is proposed in this paper. The classification results in four distinct periods according to the usage of Sangbok and Sibok as well as their colers and naming: 1) the mixed usage period, 2) the usage-differentiation period, 3) the name-differentiation period, and 4) name-reversal period. During the mixed usage period which lasted until the early 15th century, Sangbok and Sibok were used with no distinction. In the usage-differentiation period, the King Sejong first made a regulation on the use of colors of Dal-lyung according to the occasion and black colored uniforms were used only for daily cabinet meetings. In the 16th century, the names of Sangbok and Sibok began to be used distinctively: Sangbok for formal clothing in black color and Sibok for ordinary clothing in pink color This period is defined as the name-differentiation period in this paper. In the name-reversal period f·hick begun around the 17th century, the usages as well as the colors of Sangbok and Sibok are totally reversed because of some confusions of the understanding on the previous government publications. However, the distinction of formal clothing and ordinary clothing remained.

• Journal of Korean Academy of Nursing
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• v.16 no.1
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• pp.67-80
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• 1986

The use of intravenous solutions for fluid replacement has become an integral part of patient care, This widespread use of intravenous solutions has increased the risk of contamination that can lead to septicemia and phlebitis. The literature regarding contamination of in use intravenous solutions recommends a standard 24-hour time limit on the use of these fluids. But the desings of these studies did not incorporate a time variable related to contamination. In other studies, however, time was a manipulated variable: but data regarding the onset of contamination were conflicting. Because published reports conflict with regard to a time standard related to the use of intravenous therapy, additional empirical data are needed upon which to base the standards of care regulating use of intravenous therapy. This study investigated rate of contamination in simulated in-use intravenous solutions to obtain data from which to recomend a standard time period for the administration of intravenous solutions. In this study samples were drawn from 60 bottles of 5% D/W solution at predetermined time intervals over 48 hours and samples were inoculated to Thio-glychollate Broth. After 10 days' culturing in that Broth, samples were cultured on blood agar plates for 18∼48 hours to determine the rate of contamination. was found at all time Period, regardless of the presence or absence of nurse's gloving in the preparation of fluids, the location in which the experimentations were performed, the contamination level of surrounding air, or the length of time during which solutions were opened. Data from this study support the use of a 48-hour time period on which to base the standard involved in ready-to-use simple intravenous solutions without additives. In emergency departments and critical care areas where intravenous solutions are prepared in advance, the suggested time standard supported by the data generated from this study is 48 hours, not 24 hour. Data from this study support a 24-hour time standard for changing in-use intravenous solutions when the contamination results from the manipulation of intravenous infusion system by hospital personnel, or from some other exogenous sources during administration. Because contamination that does occur within 48 hours in intravenous solutions must be introduced from some exogenous sources, further empirical studies based on the identification of sources of contamination and factors that affect the rate of contamination, are needed to investigate the currently employed standard of intravenous therapy and to provide the patient with more efficient and safer intravenous thereapy.

• The Journal of Korean Society for Radiation Therapy
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• v.23 no.2
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• pp.83-90
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• 2011

Purpose: This study statistically analyzed the difference of the stability of maintaining a respiratory period shown according to position and use of a device to search the tendency and usefulness of a device. Materials and Methods: The study obtained respiratory signals which maintained a respiratory period for 20 minutes each supine and prone position for 11 subjects. The study obtained respiratory signals in a state of using a belly board for 7 patients in a bad condition of a respiratory period in a prone position to analyze a change in respiration and the stability before and after the use of a device. Results: The supine part showed 54.5%, better than the prone part of 36.4% in a case that the stability for maintaining a respiratory period was in a good condition as a fixed respiratory period was well maintained according to the position. 6 patients (85%) showed a maintenance pattern of a respiratory period significantly different before the use and 4 patients showed a significantly good change in the stability for maintaining a respiratory period as a result that belly boards were used for 7 patients that the maintenance of a respiratory period was not in a good condition on a prone position. Conclusion: It seemed that this study could contribute to the maintenance of respiratory period and of respiratory stability as the optimal position for maintenance of respiration and the use of a device such as a belly board were decided through statistic analysis of respiratory signals and its application even if patient position and use of device were decided by the beam arrangement a treatment part of a patient, location of a target, and an expected plan.

• Journal of Fashion Business
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• v.6 no.3
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• pp.41-51
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• 2002

The author of the paper investigated the changes of hairstyle along the developments in hairdressing industry in the 20th century. The development process of hairdressing industry was divided into four periods of introduction, origination, growth, and establishment. The corresponding changes of hairstyle were analyzed and the findings are as follows. 1. Hairstyle could be classified into such typical ones as traditional style, cut, bob, wave, permanent wave, up style, and hair coloring. 2. Fashion leaders affected the changes of hairstyle. 3. Whenever hairdressing appliances were introduced, new hairstyle was practiced as follows with the use of the appliances. (1) Introduction Period - Traditional Style : Chignon, pigtail ribbon $\rightarrow$ Variations were designed in hair length or split due to the limited availability of appliances. - Up Style : Pompadour, thick and up hair, encircling hair $\rightarrow$ Padding was used for sweep-up. (2) Origination Period - Bob Style : Women's first bob style. - Wave style : Wave with bob, close-cropped hair, up style $\rightarrow$ Iron, set, permanent devices were used. (3) Development Period - Wave Style : Wind wave, easily manageable wave $\rightarrow$ Blow dry, body permanent were used. (4) Establishment Period - Straight Style : Use of straight permanent. - Thick Wave Style : Development of various kinds of rod. - Hair Coloring : Advent of diverse fashion hair coloring, apart from the coloring of white hair, with the introduction of color TV. - Bob Style : Romantic bob style $^{\circ}\hat{E}$ Use of clippers and thinning scissors. Thus, the changes of hairstyle according to the development in hairdressing industry had close relationship with the improvement in hairdressing appliances.