• Applied Biological Chemistry
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• v.39 no.3
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• pp.212-217
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• 1996

Molecular structural Properties of Potato starches from Irish cobbler(mealy Potato), Dejima(waxy or soggy potato) and Shepody were investigated. iodine reaction of Irish cobbler, Sephody and Dejima starches were 0.45, 0.44 and 0.43. ${\beta}-amylolysis$ limit of the starches was not different between the three potato types. The percentage of each fraction was different among samples : in general, Dejima starch had higher proportion of $F1(more\;than\;{\overline}{DP})$, $F2({\overline}{DP}40{\sim}50)$ and lower proportion of $F3({\overline}{DP}15{\sim}20)$ than those of Irish cobbler starch. When the starch was heated in excess water at $98^{\circ}C$ for 8min, the yield of hot water-soluble starch were higher in waxy type than in mealy one. Each potato variety showed different gel chromatography pattern of the hot water soluble starch. When the potato starches were hydrolyzed with 2.2N HCI at $37^{\circ}C$ for 48 hr, the molecular weight of the starch was decreased.

• Journal of the Korean Society of Safety
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• v.35 no.5
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• pp.49-58
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• 2020

In domestic construction sites, when installing steel pipe scaffolding and system scaffolding, the guardrails are installed after the installation of the work platforms. This conventional guardrail system (CGS) is always exposed to the risk of falls because the safety railing is installed later. In order to prevent fall disasters during erecting and dismantling scaffolds, it is necessary to introduce the advanced guardrail system (AGS) which installs railings in advance of climbing onto a work platform. For the introduction of the AGS, the structural performance of the system scaffolding applying the CGS and the AGS was compared and evaluated. The structural analysis of the system scaffold (height: 31 m and width: 27.4 m) with AGS confirmed that structural safety was ensured because the maximum stress of each element of the system scaffolding satisfies the allowable stress of each element. As a result of performance comparison of CGS and AGS for each element, the combined stress ratio of vertical posts in AGS was 6.4% lower than that of CGS. In addition, in the case of ledger and transom, the combined stress ratios of AGS and CGS were almost the same. The compression test of the assembled system scaffolding (three-storied, 1 bay) showed that the AGS had better performance than the CGS by 9.7% (8.91 kN). The cross bracing exceeds the limit on slenderness ratio of codes for structural steel design. But the safety factor for the compressive load of the cross bracing was evaluated as meeting the design criteria by securing 3 or more. In actual experiments, it was confirmed that brace buckling did not occur even though the overall scaffold was buckled. Therefore, in the case of temporary structures, it was proposed to revise the standards for limiting on slenderness ratio of secondary or auxiliary elements to recommendations. This study can be used as basic data for the introduction of AGS for installing guardrails in advance at domestic construction sites.

• Journal of KIISE
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• v.42 no.5
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• pp.629-636
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• 2015

The types of errors corrected by a Korean spelling and grammar checker can be classified into isolated-term spelling errors and context-sensitive spelling errors (CSSE). CSSEs are difficult to detect and to correct, since they are correct words when examined alone. Thus, they can be corrected only by considering the semantic and syntactic relations to their context. CSSEs, which are frequently made even by expert wiriters, significantly affect the reliability of spelling and grammar checkers. An existing Korean spelling and grammar checker developed by P University (KSGC 4.5) adopts hand-made correction rules for correcting CSSEs. The KSGC 4.5 is designed to obtain very high precision, which results in an extremely low recall. Our overall goal of previous works was to improve the recall without considerably lowering the precision, by generalizing CSSE correction rules that mainly depend on linguistic knowledge. A variety of rule-based methods has been proposed in previous works, and the best performance showed 95.19% of average precision and 37.56% of recall. This study thus proposes a statistics based method using a conditional probability model with dynamic window sizes. in order to further improve the recall. The proposed method obtained 97.23% of average precision and 50.50% of recall.

• Restorative Dentistry and Endodontics
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• v.29 no.2
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• pp.141-146
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• 2004

The purpose of this study was to evaluate the efficiency of the preparation of oval canals using hand and engine-driven instruments with SEM observation. Thirty single-rooted teeth with oval canal were used in this study. The teeth were divided into 3 groups. In group A the teeth were instrumented up to a size 35 K-file using RC-prep and irrigated with 5% NaOCl between each file size. In group B. the teeth were instrumented with Profile according to the manufacture's instructions using RC-Prep and irrigated with 5% NaOCl between each file size. In group C. the teeth were instrumented with GT file according to the manufacture's instructions using RC-prep and irrigated with 5% NaOCl between each file size. Then. in all teeth. a final flush of 5ml of distilled water delivered for 30s. Canals were dried with sterile standardized paper points. After preparing the canals, the teeth were sectioned along their mesial and diatal surfaces by using low-speed diamond disc. chisel and mallet. Each root section was then dehydrated in graded concentration of alcohol (70, 80, 90, 100%). mounted on an aluminum stub. sputter-coated with gold-palladium and observed with scanning electron microscope (HITACHI S-4200) in middle and apical area. The results of this study were as follows: 1. In the middle area. group B and group C showed less smear layer than group A and it was statistically significant (p < 0.05). 2. In the middle area. group B showed greater smear layer than group C. but it was not statistically significant (p > 0.05). 3. In the apical area, group C showed less smear layer than group A. and it was statistically significant (p < 0.05). 4. In the apical area. group A showed greater smear layer than group B. but it was not statistically significant (p > 0.05). 5. In the apical area. group B showed greater smear layer than group C. but it was not statistically significant (p > 0.05). 6. In all groups. the middle area was less smear layer than the apical area. and it was statistically significant (p < 0.05).

• Journal of KIISE:Computer Systems and Theory
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• v.30 no.5_6
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• pp.273-279
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• 2003

Hypercube multicomputers have been drawing considerable attention from many researchers due to their regular structure and short diameter. One of keys to the performance of Hypercube is the efficiency of communication among processors. Among several communication patterns, multicast is important, which is found in a variety of applications as data replication and signal processing. As the number of processors increases, the probability of occurrences of fault components also increases. So it would be desirable to design an efficient scheme that multicasts messages in the presence of faulty component. In fault-tolerant routing and multicast, there are local information based scheme, global information based scheme and limited information based scheme in terms of information. In general, limited information is easy to obtain and maintain by compressing information in a concise format. In this paper, we propose a new routing scheme and a new multicast scheme using recently proposed fully reachability information scheme and new local information scheme. The proposed multicast scheme increases multicast success possibility and reduce deroute cases. Experiments show that multicast success possibility can increase at least 15% compared to previous method.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.5
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• pp.582-593
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• 2016

This study is a qualitative one that used a phenomenological study method to provide basic data for nursing practice by understanding the essence and meaning of middle aged men's hemiplegic experience after stroke. At D hospital which is located in S city, 8 hemiplegic participants who were hospitalized between 24th November, 2014, and 6th December, 2014, participated in in-depth interviews. The experiences of the participants were categorized into 6 criteria, viz. 'Thorny path on a long journey', 'Broken brakes', 'Crossroads of the mind', 'Burden of head of household', 'Signpost that lights the darkness', and 'Route to a second life', and 16 theme clusters were included in these categories. As the sequelae and complications, such as physical pain, psychological conflict and role disorder, due to stoke in middle aged men, seriously affect their quality of life, this study attempted to understand the effect of these problems and provide new insight into nursing practice. Also, it is important to prevent the recurrence of stroke in the patients, facilitate their recovery, and help them to maintain healthy lives through the reestablishment of their role in the home and society, including through the resolution of their physical and psychological problems.

• Korean Security Journal
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• no.42
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• pp.179-203
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• 2015

Nowadays college students in South Korea experience much stress related to job search due to the continuing unemployment crisis. Particularly, students who hold a degree in Security Services suffer from such stress at a higher level compared to other students because of the specific qualifications sought by potential employers. Therefore, this study investigates the effect of the stress related to job search on career maturity among the students of Security Services. The authors surveyed 250 students of Security Services from 7 colleges in Gyeonggi, Jeolla, and Gyeongsang provinces. Before distributing the questionnaire, its validity and reliability were assessed through the consultations with experts in the related fields. The data collected was examined via various statistical methods, including factor, reliability, correlation, and regression analyses using SPSS 20.0. The results indicated that socio-demographic characteristics affected job search stress and career maturity. Additionally, it was found that the job search-related stress of the students influenced their career maturity. To illustrate, job search stress and career maturity were positively related. Based on the results of the analyses, the authors confirm that the students of Security Services are suffering from a high level of stress resulting from job search, which impacts their career selection. Finally, policy implications are discussed, including alleviating the stress by providing diversified career choices to the students.

• Korea journal of population studies
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• v.31 no.1
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• pp.75-97
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• 2008

Recently Korea is expected with the decrease of population in working ages and also population structure, especially age structure, has changed as aging goes faster. This study focuses on the relationship between age structure and wage structure to analyzes the cohort size effect on the change of age-earnings profile. Our empirical analysis based on Wright(1991)'s model takes weighted OLS regression using the male worker's data of Ministry of Labor 'Wage Structure Survey'($1990{\sim}2006$). In pooled data, we take the conclusion that the cohort size effect was found in high school and college graduate workers, but the effect is different between them. The labor market entry effect of high school graduate workers is negative(-) and his persistent effect is positive(+). On the other hand, the cohort size effect of college graduate workers have appeared the opposite directions in contrary with the existing results of Welch(1979) and Wright(1991). This results are seen as the possibility that college graduate worker has the benefit of wage level by his relative cohort size in spite of high unemployment of young graduate. It will be the sign of need that we should interest in the change of age structure with balancing the labor supply side approach and the demand side study which the previous studies was mainly tended to focus on.

• Korean Journal of Poultry Science
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• v.7 no.2
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• pp.47-53
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• 1980

This study was carried out to investigate the variations in the thickness of egg shell and egg shell membrane of Quail eggs from July 25, 1978 to September 7, 1978. No. of eggs used in this experiment was 520 okay and all the eggs were purchased from a farm located in Jinju city. The results obtained are summarized as follows: 1. Egg shells of quail were classified as white egg shell with large spots, egg shell with large spots, violet egg shell with small spots and beige egg shell with small spots by the exterior shell colour and their average egg weights were 8.993g, 8.866g, 8.403g and 8.109g, respectively. 2. Average egg shell thickness of white egg shell with large spots, egg. shell with large spots, violet egg shell with small spots and beige on shell with small spots were 0.171mm, 0.169mm, 0.160mm, and 0.156mm, respectively. 3. Average eggs shell membrane of white egg shell with large spots, egg shell with large spots, violet egg shell with small spots and beige egg shell with small spots were 0.0449mm, 0.0431mm, 0.0398mm, and 0.0397mm, respectively. 4. Negative correlation coefficient was found between egg shell thickness ana egg shell membrane thickness, but it was not significant. 5. Comparing quail egg with fowl egg, the thickness of quail egg shell was much thinner than that of fowl egg, but egg shell membrane thickness was similar between the two.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.1 no.1
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• pp.38-50
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• 1995

Tensile strength (TS) of ${\kappa}-carrageenan$ films without salt was 22-32 MPa and was the highest among ${\kappa},\;{\lambda}\;and\;{\iota}-carrageenan$ films. ${\kappa}-carrageenan$ films had high mechanical barrier properties as they are compared with TS of polyethylene films which are 13-28 MPa. TS of ${\iota}-carrageenan$ films without salt was 5-9 MPa and was the lowest among the films. Mechanical properties (TS and elongation) were affected by the concentration of plasticizers. Especially, elongation of ${\kappa}-carrageenan\;and\;{\iota}-carrageenan$ drastically increased as the concentration of plasticizer increased. Mechanical properties (TS and elongation) were greatly affected by various concentration and kind of salts. TS of Film-A (0.375 g plasticizer/g carrageenan) of ${\kappa}-carrageenan$ films which contains 0.1% (w/w) potassium chloride increased to 45 MPa which was the highest among the TS of biopolymer films which have been developed.