• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.235-241
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• 2017

This study investigated the performance factors for entry into the labor market of 4 - year college graduates using KEEP data and to determine how the labor market performance is related to the training institutions. The labor market performance is termed as 1) labor market entry time, 2) employment type, and 3) wage. Correspondence analysis was carried out with a nominal variable indicating the characteristics of a training institute, in which the respondents were trained for employment, and the relationship between the two was expressed in a more visible way. First, as a result of analyzing the first job transition period, the shortest training institutes were analyzed as public institutes, followed by private institutes and universities. Second, the employment rate of the public institutions is higher than that of private institutes and universities. Second, the employment rate of public institutions is higher than that of private institutes and universities. Third, the wage level of public institutes ranged from wage level 1 to 3, while private institutes had a wage level ranging from 2 to 4. Universities showed a wide range from 1 to 5. Based on these results, this study can analyze the difference in the labor market performance by training institutions when young people enter society.

• Korean Journal of Remote Sensing
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• v.19 no.4
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• pp.307-317
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• 2003

This paper presents an algorithm that automatically extracts buildings among many different features on the earth surface by fusing LIDAR data with panchromatic aerial images. The proposed algorithm consists of three stages such as point level process, polygon level process, parameter space level process. At the first stage, we eliminate gross errors and apply a local maxima filter to detect building candidate points from the raw laser scanning data. After then, a grouping procedure is performed for segmenting raw LIDAR data and the segmented LIDAR data is polygonized by the encasing polygon algorithm developed in the research. At the second stage, we eliminate non-building polygons using several constraints such as area and circularity. At the last stage, all the polygons generated at the second stage are projected onto the aerial stereo images through collinearity condition equations. Finally, we fuse the projected encasing polygons with edges detected by image processing for refining the building segments. The experimental results showed that the RMSEs of building corners in X, Y and Z were 8.1cm, 24.7cm, 35.9cm, respectively.

• Journal of Korea Water Resources Association
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• v.52 no.10
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• pp.719-728
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• 2019

Valve in water distribution network (WDN), that controls the flow in pipes, is used to isolate a segment (a part of WDN) under abnormal water supply conditions (e.g., pipe breakage, water quality failure event). The segment isolation degrades pressure and water serviceability in neighboring area during the water service outage of the segment. Recent hydraulic and water quality failure events reported encouraging WDN valve installation based on various abnormal water supply scenarios. This study introduces a scenario-based optimal valve installation approach to optimize the number of valves, the amount of undelivered water, and a shortest water supply path indicator (i.e., Hydraulic Geodesic Index). The proposed approach is demonstrated in the valve installation of Pescara network, and the optimal valve sets are obtained under multiple scenarios and compared to the existing valve set. Pressure-driven analysis (PDA) scheme is used for a network hydraulic simulation. The optimal valve set derived from the proposed method has 19 fewer valves than the existing valve set in the network and the amount of undelivered water was also lower for the optimal valve set. Reducing the reservoir head requires a greater number of valves to achieve the similar functionality of the WDN with the optimal valve set of the original reservoir head. This study also compared the results of demand-driven analysis (DDA) and the PDA and confirmed that the latter is required for optimal valve installation.

• Korean Journal of Plant Resources
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• v.22 no.2
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• pp.145-151
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• 2009

This study was performed to investigate the antioxidant activities and the whitening effect of mulberry (Morus alba L.) root bark extracts. The antioxidant activities of water and 70% ethanol extracts of mulberry root bark were 65.8% and 87.0% in the DPPH assay at $1,000\;{\mu}g/ml$ ; 89.3% and 77.1% in the ABTS assay at $1,000\;{\mu}g/ml$. Xanthine oxidase inhibition of water and 70% ethanol extracts were 100% and 96.2% at $1,000\;{\mu}g/ml$. Nitric oxide radical inhibition of water and 70% ethanol extracts showed 43.5% and 53.0% at $500\;{\mu}g/ml$, and it was similar to the BHA effect(43.8%). Tyrosinase inhibitory activities of water and 70% ethanol extracts were 79.6% and 93.5% at $1,000\;{\mu}g/ml$. These results confirm that mulberry root bark has the great potential to be a cosmeceutical ingredient with a natural antioxidant and a skin-whitening effect.

• Journal of Family Resource Management and Policy Review
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• v.25 no.3
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• pp.1-15
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• 2021

This study explored how the family resilience of participants in self-sufficiency programs relates to their willingness to be self-sufficient and analyzed the mediating effects of family support in the relationship. The subjects of the study were 283 people in their 20s to 70s who are participating in a local self-sufficiency center in Gangwon-do. Statistical analyses were conducted using IBM SPSS 18, with descriptive statistics, difference verification and regression, and mediating effects analyzed following Baron & Kenny(1986). The results of the analysis are as follows. First, we conducted difference verification between the sociodemographic characteristics of participants in the self-sufficiency program and major variables. There was a significant difference in the willingness to be self-sufficient in terms of the caregiving family and household income. Family resilience differed significantly depending on age group, marital status, health condition, household type, caregiving family, and homeownership, while family support differed significantly in age group, marital status, health condition, household type, caregiving family, and debt. Second, we conducted a hierarchical regression analysis to determine the factors influencing the will of self-sufficiency of those participating in the self-sufficiency program and found that the better the health condition, the presence of caregiving families, and the higher the level of family resilience and family support, the higher the level of will to be self-sufficient. Third, analyses of the mediating effect following Baron & Kenny(1986) have shown that family support has a full mediating effect on the relationship between family resilience and the will to be self-sufficient. Thus, we have verified that family resilience and family support are important factors as an alternative to improving the level of willingness for self-sufficiency program participants.

• Journal of Plant Biotechnology
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• v.47 no.4
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• pp.337-344
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• 2020

Plant growth-promoting microorganisms promote plant growth by supplying nutrients to roots and interacting with the intrinsic factors in plants through volatile organic compounds (VOCs). In this study, we evaluated the effect of UOS, plant growth-promoting fungi (PGPF) isolated from previous study, on the growth of Nicotiana tabacum L. var Xanthi nc. Phylogenetic analysis and GC-MS were used to identify the fungal species and the VOCs emitted by the UOS, respectively. The fresh weight of UOS-treated Nicotiana tabacum L. was 3.8 and 4.2-fold higher than that of the control groups grown in vertical and I-plates, respectively. Moreover, in the UOS-treated plants, the length of the primary root was half and the number of lateral roots were twice compared to those in control plants. The UOS was identified as Phoma sp. by studying spore and mycelial morphology and using phylogenetic analysis. GC-MS revealed that the VOC emitted by the UOS was hexamethylcyclotrisiloxane (D3). These results suggest that the UOS of Phoma sp. influences plant growth and root development through D3. We expect this UOS and its VOC, D3 to be utilized in the future to increase growth and enhance yield for other plants.

• Cross-Cultural Studies
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• v.52
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• pp.223-251
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• 2018

This paper comparatively considered how Korea and Japan address the concept of 'postwar' in descriptions of their literary history. In Japan, 'postwar' refers to the period after World War II (Asia-Pacific War). This word implies a variety of contexts such as collapse, poverty, confusion, calendar reform, reconstruction and restoration as well as a series of historical events such as war, war defeat, and American occupation; and so it has been treated in Japanese society a significant period. In the history of Korean literature, it is after national liberation that the word 'postwar' appeared; however, it has usually indicated 'the period after the Korean War.' The question is that although the term of postwar refers to periods after different wars, Koreans used the term of postwar also in the same way as Japan, and their concept of postwar overlaps with the concept of prewar or postwar used in Japan, and accordingly, side effects are produced that fail to grasp properly the independent characteristics and significance of the Korean War. In conclusion, the Korean War brought about contrasting effects on the history of Korean and Japanese literature. While the Korean War meant a start after the war in Korean literature, it became a turning point marking the end of postwar in Japanese literature. Such different perceptions on postwar also have major implications in that perceptions represent postwar discourses in today's Korea and Japan.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.61-73
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• 2021

Metaheuristic search methods have been developed to solve problems with a range of purpose functions in situations lacking information and time constraints. In this study, the Hybrid Vision Correction Algorithm (HVCA), which enhances the performance of the Vision Correction Algorithm (VCA), was developed. The HVCA has applied two methods to improve the performance of VCA. The first method changes the parameters required by the user for self-adaptive parameters. The second method, the CGS structure of the Exponential Bandwidth Harmony Search With a Centralized Global Search (EBHS-CGS), was added to the HVCA. The HVCA consists of two structures: CGS and VCA. To use the two structures, a method was applied to increase the probability of selecting the structure with the optimal value as it was performed. The optimization problem was applied to determine the performance of the HVCA, and the results were compared with Harmony Search (HS), Improved Harmony Search (IHS), and VCA. The HVCA improved the number of times to find the optimal value during 100 repetitions compared to HS, IHS, and VCA. Moreover, the HVCA reduced the Number of Function Evaluations (NFEs). Therefore, the performance of the HVCA has been improved.

• The Journal of Korean Philosophical History
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• no.57
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• pp.31-55
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• 2018

Professor Dowon (道原) Lew, Seung-Kook (柳承國: 1923~2011) was a master of Eastern philosophy in Korea, in the 20th century. 'Confucianism' was the root of his discipline. Nevertheless he studied extensively throughout Eastern philosophy. He was also a pioneer of 'Korean Philosophy', who devoted himself to 'establishing the original form (原型) of Korean thought'. Professor Lew showed a unique view on how Confucian thought was formed. He has done many years of precise comparative analysis of the results of archaeological studies before 1970, particularly the study of bone-and-shell inions, and what was said in previous literature. As a result, he concluded that "we cannot discuss the origins of Confucian thought by separating the relationship with the Dongyi tribe". Confucianism was formed in relation to Dongyi. The purpose of his attention to the Dongyi tribe - RenFang tribe (人方族) was not to examine Dongyi tribe and its culture. His purpose was to examine how Confucian thought was formed and to examine the relevance of Dongyi tribe in this process. This was in conjunction with the task of exploring 'the original form of Korean thought', whether he pretended or not. Professor Lew, Seung-Kook's theory differed not only from the conventional view of the academic world in his time but also from the conventional view up to now. It is a pity that it was not yet discussed it in the academic world. I consider that it is necessary to seriously review Professor Lew and Seung-Kook's theory at this point when China has outlined the Northeast project (東北工程).

• Journal of the Korea Institute of Information Security & Cryptology
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• v.31 no.1
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• pp.83-97
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• 2021

Wireless sensors that make up the Wireless Sensor Network generally have extremely limited power and resources. The wireless sensor enters the sleep state at a certain interval to conserve power. The Sleep deflation attack is a deadly attack that consumes power by preventing wireless sensors from entering the sleep state, but there is no clear countermeasure. Thus, in this paper, using clustering-based binary search tree structure, the Sleep deprivation attack detection model is proposed. The model proposed in this paper utilizes one of the characteristics of both attack sensor nodes and normal sensor nodes which were classified using machine learning. The characteristics used for detection were determined using Long Short-Term Memory, Decision Tree, Support Vector Machine, and K-Nearest Neighbor. Thresholds for judging attack sensor nodes were then learned by applying the SVM. The determined features were used in the proposed algorithm to calculate the values for attack detection, and the threshold for determining the calculated values was derived by applying SVM.Through experiments, the detection model proposed showed a detection rate of 94% when 35% of the total sensor nodes were attack sensor nodes and improvement of up to 26% in power retention.