• Korean Journal of Weed Science
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• v.8 no.3
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• pp.283-290
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• 1988

This study was conducted to clarify the identification of phytotoxic compounds from 5 upland weeds which had been collected at their maturity age in the field of Kyungpook province, Korea. 5 weed species including Stellaria aquatica strongly inhibited the lettuce seed germination. These 5 species were Amaranthus lividus, Stellaria aquatica, Achyranthes japonica, Polygonum perfoliata and Galinsoga ciliata. the degree of inhibitory effects according to various solvent extracts such as ethanol, aceton, chloroform and ether was different as species. In total phenol and diphenol content G. ciliata had largest amount of total phenol with 2.75mg/g, P. perfoliata 1.8mg/g, S. aquatica 1.7mg/g, A. lividus 1.28mg/g, A. japonica 1.27mg/g respectively. A. lividus had much amount of p-cresol, hydroquinone, ferulic, caffeic, p-cl-benzoic and p-coumaric in order. S. aquatica, A. japonica, P. perfoliata and G. ciliata had a large quantity of ferulic, caffeic, 7-OH-coumarin and protocatechuic acids in common. The amount of fatty acids was existed 8.49mg/g in S. aquatica, 7.14mg/g in A. japonica, 7.10mg/g in G. ciliata, 5.49mg/g in P. perfoliata and 4.2mg/g in A. lividus respectively. Most of 4 weeds except G. ciliata had much oxalic acid to the extent of 14-22mg/g. however it appeared that G. ciliata had much quantity of feruic and citric acids.

• Journal of the Korean association of regional geographers
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• v.19 no.4
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• pp.615-626
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• 2013

In this study, spatial patterns of the urban flood vulnerability index in Seoul are examined by considering climate exposure, sensitivity, and adaptability associated with floodings for recent 5 year (2006~2010) period by the smallest administrative unit called Dong. According to the results of correlation analyses based on the IPCC(Intergovernmental Panel on Climate Change)'s vulnerability model, among many variables associated with urban flooding, rainwater tank capacity, 1-day maximum precipitation and flood pumping station capacity have statistically-significant, and relatively-high correlations with the number of flood damage in Seoul. The flood vulnerability map demonstrates that the extensive areas along Anyang and Joongnang streams show relatively high flood vulnerability in Seoul due to high sensitivity. Especially in case of Joongnang stream areas, climatic factors also contribute to the increase of flood vulnerability. At local scales, several Dong areas in Gangdong-gu and Songpa-gu also show high flood vulnerability due to low adaptability, while those in Gangnam-gu do due to high sensibility and climate factor such as extreme rainfall events. These results derived from the flood vulnerability map by Dong unit can be utilized as primary data in establishing the adaptation, management and proactive policies for flooding prevention within the urban areas in more detail.

• Korean Journal of Food Science and Technology
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• v.21 no.6
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• pp.742-748
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• 1989

Rheological properties of gelatinized millet starch dispersions were evaluated. Gelatinized nonwaxy and waxy millet starch dispersion were typical pseudoplastic fluids. At constant shear rate, gelatinized waxy millet starch dispersion showed higher shear stress than nonwaxy millet starch dispersion. Flow behaviours of gelatinized nonwaxy and waxy millet starch dispersion were well fitted to Herschel-Bulkley equation and flow behaviour index (n) and consistency index (K) were strongly concentration dependent. There was a linear relationship between concentration of gelatinized starch dispersion and square root of yield stress. The concentrations of gelatinized nonwaxy and waxy millet starch dispersion where yield stresses become zero were estimated as 2.19 and 1.69%, respectively. Pseudoplastic constant (m) approaches to a constant value in each type of millet starch when the concentration of gelatinized starch dispersion was increased. As the measuring temperatures increase, n value was increased, whereas, K value was decreased. The activation energies of gelatinized nonwaxy and waxy millet starch dispersion were 2.89 and 3.18kcal/mol, respectively.

• The Journal of the Petrological Society of Korea
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• v.16 no.2 s.48
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• pp.47-58
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• 2007

This study examines the distribution of basement rocks in Gyochon-ri, Muan-eup, Muan-gun, Jeonnam where ground subsidence occurred in June 2005, and traces corrosion of limestone. Mica schist and rhyolite are distributed in the surface of the study area, but thick limestone layer with large and small caverns are distributed underground. A horizon of limestone with maximum width of 300 m and 4 km of length was found along the detour which is in the north of pound subsidence. Such identification of limestone presence would be very useful to predict potential ground subsidence. Limestone in this area was disturbed by fold and fault due to severe shearing deformation. Small caverns were frequently found in anticline part of folds formed in limestone layer. Schists with different thicknesses were intercalated in the limestone with shearing deformation and consist of sheet silicate minerals (chlorite and mica) and quartz. In sections of weathered specimen, it is shown that biotite of schist part was altered into chlorite and corrosion of calcite around the schist followed. This suggest that ground water permeated between intercalated sheet silicate minerals and corrosion of limestone began. And small caverns were generated where active corrosion occurred. This study suggests that because of many reasons (for instance, reclamation of the Bulmu reservior and excess pumping), cavern water level was lowered and cave sediments were removed, and it caused ground subsidence to occur.

• Journal of Life Science
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• v.25 no.4
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• pp.441-449
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• 2015

Endlicheria anomala, a neotropical plant, is found in northern South America and the Amazon region. It is traditionally used to remove poisons and cure gangrene. According to recent data, this plant has diverse biological properties such as anti-oxidative, anti-inflammatory and anti-melanogenic properties. However, the anti-cancer effect of E. anomala and its molecular mechanisms remain unclear. In this study, we examined the anti-cancer effect and the active mechanism of methanol extract of E. anomala (MEEA) in human lung adenocarcinoma cells (A549) and human liver cancer cells (HepG2). Our data revealed that MEEA showed cytotoxic activity in a dose-dependent manner and induced apoptosis both in A549 and HepG2 cells. We verified evidences of apoptosis via formation of chromatin condensation, apoptotic body and accumulation of cells in the subG1 phase. Following observed apoptosis-related phenomena, we found that the induction of apoptosis by MEEA was associated with the increase of tumor suppressor p53 and cyclin-dependent kinase inhibitor p21 (WAF1/CIP1) expression. Furthermore, MEEA-induced apoptosis was characterized with proteolytic activation of caspase-3, degradation of poly ADP ribose polymerase (PARP), and up-regulation of pro-apoptotic Bax expression. Taken together, these findings indicate that MEEA may have potential cancer therapeutic utility in A549 and HepG2 cells.

• KDI Journal of Economic Policy
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• v.19 no.2
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• pp.73-157
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• 1997

19세기(世紀) 중반(中盤)에 시작된 선진국(先進國)들의 공업화(工業化)는 약 100년이 소요(所要)되었는데 동(東)아시아 신흥공업국(新興工業國)(NICs)들의 경우에는 20~30년이 소요(所要)된 것으로 추정된다. 후자(後者)의 공업화(工業化) 경험은 흔히 '동(東)아시아의 기적(奇蹟)'이라 불린다. 그러나 이 고속성장(高速成長) 혹은 압축성장(壓縮成長)이 가능했던 이유가 무엇이냐에 관해 경제학계(經濟學界) 내외(內外)에서 그리고 국내외(國內外)에서 일치된 의견이 없고, 특히 이 과정에서의 정부(政府)의 역할(役割)을 어떻게 평가하느냐에 관하여는 더욱 그러하다. 신고전(新古典) 경제학(經濟學)은 이 나라들의 가격왜곡(價格歪曲)의 최소화(最小化), 시장기구(市場機構)의 활용(活用), 국제분업(國際分業)에의 참여(參與)에서 주된 이유를 찾고 있는데 비해, 소위 수정주의(修正主義)는 이같은 견해가 사실과 크게 괴리가 있으며 '기적(奇蹟)'은 시장(市場)의 자원배분(資源配分)에 대한 정부개입(政府介入)이 주효(奏效)하였기 때문이라 주장한다. '동(東)아시아의 기적(奇蹟)'은 동(東)아시아란 지역(地域)에서 일어난 현상일 뿐 아니라 20세기(世紀) 후반(後半)에 일어난 동시대적(同時代的) 현상이기도 하다. 공업화(工業化)를 이룬 나라들은 모두 세계시장(世界市場)과 활발히 교역(交易)하였다는 공통점이 있는데, 세계시장(世界市場)의 규모(規模)를 대표하는 세계총수출(世界總輸出)이 19세기(世紀) 중반(中盤)과 20세기(世紀) 후반(後半) 사이에 실질기준(實質基準)으로 100배 이상 커졌다. 이 글은 세계시장(世界市場)의 규모증대(規模增大)가 동(東)아시아 NICs들의 고속성장(高速成長)의 이유(理由)였을 가능성(可能性)을 이론적(理論的)으로, 실증적(實證的)으로 검토해본 것이다. 이론적(理論的)으로는, A Lewis의 무한노동공급(無限勞動供給)(unlimited supply of labor)이 존재하는 경제(經濟)에서는 세계시장((世界市場) 상대가격(相對價格)이 불변(不變)인 한 제조업내(製造業內) 노동집약도(勞動集約度)가 높은 산업(産業)에 대한 투자유인(投資誘因)이 지속된다는 점에 고속성장(高速成長)의 근거가 있다고 보았다. 이러한 투자(投資)의 지속은 제조업부문(製造業部門)의 산출(産出)과 고용(雇傭)이 경제(經濟)에서 점하는 비중(比重)을 낮은 자원비용(資源費用)으로 증대(增大)시킬 것이기 때문이다. 실증분석(實證分析)에서는, 필요한 통계자료(統計資料)가 있는 19개국의 공업화(工業化) 경험(經驗)을 검토하였는데, 한 나라가 공업화(工業化)를 시작하는 시점(時點)의 세계총수출(世界總輸出)이 클수록 그 나라의 공업화(工業化) 소요기간(所要期間)이 단축(短縮)된다는 매우 확실한 증거가 있었다. 또한 동(東)아시아 NICs의 공업화(工業化) 소요기간(所要期間)이 선진국(先進國) 경험에 비해 약 1/4의 길이로, 혹은 그보다 더 짧게 단축(短縮)된 것은 거의 모두 세계총수출(世界總輸出) 규모(規模)의 증가(增加)로 설명될 수 있었다. 이같은 이론적(理論的) 근거(根據)와 실증적(實證的) 증거(證據)를 감안할 때, 우리 경제(經濟)는 정부주도형(政府主導型)이었으나 고속성장(高速成長)을 가능하게 한 것은 정부주도(政府主導)보다는 그 규모(規模)가 대폭 증대한 세계시장(世界市場)에서의 국제분업(國際分業)이었다.

• The Transactions of the Korea Information Processing Society
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• v.6 no.12
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• pp.3447-3455
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• 1999

Database correctness is guaranteed by standard transaction scheduling schemes like two-phase locking for the context of concurrent execution environment in which short-lived ones are normally mixed with long-lived ones. Traditional syntax-oriented serializability notions are considered to be not enough to handle in particular various types of transaction in terms of duration of execution. To deal with this situation, altruistic locking has attempted to reduce delay effect associated with lock release moment by use of the idea of donation. An improved form of altruism has also been deployed in extended altruistic locking in a way that scope of data to be early released is enlarged to include even data initially not intended to be donated. In this paper, we first of all investigated limitations inherent in both altruistic schemes from the perspective of alleviating starvation occasions for transactions in particular of short-lived nature. The idea of two-way donation locking(2DL) has then been experimented to see the effect of more than single donation in distributed database systems. Simulation experiments shows that 2DL outperforms the conventional two-phase locking in terms of the degree of concurrency and average transaction waiting time under the circumstances that the size of long-transaction is in between 5 and 9.

• KIPS Transactions on Software and Data Engineering
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• v.9 no.12
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• pp.403-410
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• 2020

In addition to the research on noise removal and super-resolution using the data restoration (Output result) function of Autoencoder, research on the performance improvement of clustering using the dimension reduction function of autoencoder are actively being conducted. The clustering function and data restoration function using Autoencoder have common points that both improve performance through the same learning. Based on these characteristics, this study conducted an experiment to see if the autoencoder model designed to have excellent data recovery performance is superior in clustering performance. Skip connection technique was used to design autoencoder with excellent data recovery performance. The output result performance and clustering performance of both autoencoder model with Skip connection and model without Skip connection were shown as graph and visual extract. The output result performance was increased, but the clustering performance was decreased. This result indicates that the neural network models such as autoencoders are not sure that each layer has learned the characteristics of the data well if the output result is good. Lastly, the performance degradation of clustering was compensated by using both latent code and skip connection. This study is a prior study to solve the Hanja Unicode problem by clustering.

• The Journal of Korean Philosophical History
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• no.59
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• pp.39-63
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• 2018

Kiho Academic in the late Joseon Korea, the negative effect of the Horak debate is amplified and the division within the academic is accelerated. However, the scholars of the Kiho Academic field put forth efforts to unify the academics with the same sense of responsibility to end the schism. Nevertheless, the scholars of the Kiho Academic have shown various differences in the process of accepting Neo-Confucianism, which creates new schools. Therefore, Kiho Academic in the late Joseon Korea coexisted with various schools with different academy positions. Some of the representative groups are Hwaseo, Nosa, Ganjae, Yeonjae, and Uuidang Schools. In addition, through the scholarly differentiation and the school division of the Kiho Academic, the debate on the mind that characterizes Neo-Confucianism of the late Joseon Korea has developed. However, there was a common value that everyone pursued in the middle of the debate: the construction of a moral ideal society, the ultimate goal of Neo-Confucianism. In conclusion, though the purpose they pursued was not fulfilled, it can be seen from the debate on the mind that they fiercely demanded that these requests were urgent in the late Joseon Korea This paper, therefore, the situation of the Kiho academic in the late of Joseon Korea, the problem consciousness of the scholars of the Kiho academic, and the issue and development of debate on the mind.

• Korean Journal of Culture and Social Issue
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• v.27 no.4
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• pp.529-559
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• 2021

This study examines how people perceive and experience busyness, which is a great social pressure in the Korean society, and The socio-psychological motives that drive people's different paces of life, such as busyness or slowness, despite being in the same busy reality, were examined. Furthermore, an in-depth study was conducted on the adaptation factors in the real society according to the speed of individual life. The analysis of this study was based on an in-depth interview data of 21 unmarried men and women in their 20s and 30s, and was conducted using a phenomenological qualitative analysis method. As a result, the perception and experience of being busy had both positive and negative parts. The components of socio-psychological motivation that affect the speed of an individual's life are 'internalization of positive values of (busy/rest)', '(future/present) centric', 'selection & concentration/Inertial busyness', 'personality characteristics' were derived. In addition, 'self-selection', 'successful time management', and 'maintenance of psychological health' were derived as common factors among adaptation factors in real society, 'a sense of achievement' and 'understanding and accepting self-characteristics' were derived as discriminatory factors. became Based on these results, the value and meaning of being busy in Korean society was discussed from a social psychology perspective, and a new perspective was presented to existing studies and discussions related to the speed of life. In addition, several follow-up studies were proposed.