• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.278-278
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• 2013

최근 나노 입자의 안전성에 대한 연구가 활발하게 이루어 지고 있다. 대부분의 연구는 세포독성과 쥐에 흡입시켜 각 장기에 침착 정도를 측정하는 연구에 집중되어 있고, 나노입자의 리간드 특성에 대한 연구는 활발이 진행되고 있지 않다. 따라서 같은 나노입자를 이용한 연구결과가 다르게 나타나는 것을 종종 확인 할 수 있어서, 나노입자 특성평가의 중요성이 커지고 있다 [1,2]. 본 연구에서는 용매에 리간드가 존재하는 PEG-conjugated AuNPs과 원심분리로 용액내의 free-ligands가 제거된 PEG-conjugated AuNPs에 대하여 ToF-SIMS 이미지를 얻었고, PEG와 AuNPs 이미지의 statistical correlation으로부터 AuNPs의 표면에 존재하는 리간드들의 stability를 평가할 수 있는 방법을 개발하였다. 또한, citrated-conjugated AuNPs을 PEG 리간드로 표면을 치완시키고, phagolysosomal simulant Fulid(PSF) 용액에 incubation 과정 동안의 PEG 리간드가 표면에서 제거되어 용액에 존재함을 확인하였다. ToF-SIMS의 이미지와 statistical correlation을 이용하면 나노입자의 표면에 존재하는 다양한 리간드들의 안정성을 평가할 수 있고, 이를 통한 나노입자의 안전성에 대한 연구에 기여 할 수 있을 것으로 기대된다.

• Convergence Security Journal
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• v.3 no.3
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• pp.75-80
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• 2003

One way Functions are similar to the passwords in the sense that are easy to compute and hard to invert. So they are the most basic primitive for cryptographic applications. Especially, it is well known that it needs to exist of one way functions for the existence of the encryption schemes. In this note, we devote to study the various properties of the one way functions to give the base for the construction of the secure encryption schemes. They include the study for a sort and part of one way functions. Also, we deal with the theoretical relationship between one way function and trapdoor function.

• Communications of Mathematical Education
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• v.35 no.4
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• pp.413-423
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• 2021

This study investigated the empty set which is one of the mathematical objects. We inquired some misconceptions about empty set and the background of imposing empty set. Also we studied historical background of the introduction of empty set and the axiomatic system of Set theory. We investigated the nature of mathematical object through studying empty set, pure conceptual entity. In this study we study about the existence of empty set by investigating Alian Badiou's ontology known as based on the axiomatic set theory. we attempted to explain the relation between simultaneous equations and sets. Thus we pondered the meaning of the existence of empty set. Finally we commented about the thoughts of sets from a different standpoint and presented the meaning of axiomatic and philosophical aspect of mathematics.

• Journal of the Korean Institute of Intelligent Systems
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• v.23 no.3
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• pp.214-219
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• 2013

This paper proposes the robust high-gain observer based SOC estimatro for uncertain RC model of Li-Ion batteries. In general, RC battery model has inevitable uncertainties and it cause some negative effect to estimate the accurate SOC of Li-Ion batteries. The proposed estimator overcomes such weakness with two techniques; high-gain observer design technique and sliding mode control technique. A high-gain observer provides the robustness against model uncertainties to the proposed estimator. A sliding mode control technique helps the proposed estimator by reducing the side effect of adopting a high-gain observer such as peaking phenomenon and perturbation. The performance of the proposed estimator is verified by some simulation.

• Korean Journal of Culture and Social Issue
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• v.27 no.4
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• pp.585-607
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• 2021

In order to examine the variables affecting gambling behavior and find intervention strategies, this study examined the effects of basic psychological needs satisfaction on the severity of gambling behavior and low-level gambling behavior through the general motivation level and mattering respectively. Self-reported data of 402 adults who have participated in gambling at least once in the last 3 months were analyzed, and dual-mediator model was conducted. Basic psychological needs satisfaction significantly contributed to gambling behavior severity through general motivation and mattering. Specifically, basic psychological needs satisfaction had a significant positive effect on mattering through general motivation. and mattering through this path had a significant negative effect on gambling behavior severity. On the other hand, basic psychological needs satisfaction had a significant negative effect on low-level gambling behavior, but the dual mediating effect of general motivation and mattering was not significant in this relationship. Based on these results, the theoretical implications on the effects of the general motivation and interpersonal presence on gambling behavior were proposed, study limitations and suggestions for future research were discussed.

• Journal of KIISE:Information Networking
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• v.31 no.1
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• pp.112-122
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• 2004

In this paper, we propose a mobility estimation model based on inner regions in a cell and a dynamic resource reservation scheme which can control dynamically classes of mobile hosts on the mobile network. The mobility estimation model is modeled based on the reducible Markov chain. And the mobility estimation model provides a new hand off probability and a new remaining time for the dynamic resource reservation scheme. The remaining time is n estimated time that mobile hosts can stay in a cell. The dynamic resource reservation scheme can reserve dynamically a requested resource according to the classes of mobile hosts. This scheme can efficiently improve the connection blocking probability and connection dropping probability.

• The Korean Journal of Financial Management
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• v.16 no.2
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• pp.337-364
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• 1999

본 연구에서는 국내 주가지수선물시장과 현물시상간의 일중 가격 및 가격변동성의 선-후행관계를 실증적으로 분석함으로써 양 시장간의 동적관련성을 살펴보고자 하였다. 먼저, 상관관계분석의 결과는 KOSPI 200 주가지수선물수익률과 현물수익률, 그리고 주가지수선물수익률자승과 현물수익률 자승간에 유의한 교차상관관계가 존재하는 것으로 나타났다. 수익률의 선-후행관계를 살펴보기 위한 주가지수선물수익률의 시차변수들과 현물수익률간의 다중회귀분석의 결과는 주가지수선물수익률이 현물수익률을 약 15분 정도 선행하는 것으로 나타났으며, 이러한 현상은 현물수익률에 존재할 수 있는 비동시적 거래의 영향을 통제한 경우에도 비록 그 강도가 약하기는 하지만 여전하였다. 다음으로, 수익률 변동성의 선-후행관계를 살펴보기 위해 Grammatikos-Saunders (1986)가 제시한 무조건부 변동성의 추정치인 로그수익률자승을 사용하여 분석한 결과 주가지수선물수익률의 변동성이 현물수익률의 변동성을 약 10분 정도 선행하는 것으로 나타났으며, 이러한 결과는 비동시적 거래의 영향을 통제한 경우에도 동일하였다. 또한, Nelson(1991)의 EGARCH모형을 사용하여 수익률의 변동성을 추정한 후 이를 갖고 분석한 결과, 특히 비동시적 거래의 영향을 통제한 경우에는 주가지수선물시장과 현물시장의 수익률 변동성간에 선-후행관계가 존재한다는 것을 부정할 수 없었다.

• KDI Journal of Economic Policy
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• v.11 no.4
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• pp.39-67
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• 1989

본(本) 연구(硏究)에서는 우리나라 증권산업(證券産業)에 있어서 규모(規模) 및 범위(範圍)의 경제성(經濟性)의 존재여부를 실증분석하였다. 이것을 일본(日本)의 경우와 비교하면 우리나라에서도 증권업(證券業) 규모(規模)의 경제성(經濟性)이 대체로 존재하며 대규모(大規模)보다는 중(中) 소규모(小規模)에서 뚜렷이 시현되는 것으로 나타났다. 그러나 업무범위(業務範圍)의 경제성(經濟性)의 존재는 통계적으로 유의(有意)하게 입증되지 않으며 다만 자금(資金)이나 신인도면(信認度面)에서 유리한 입장에 있는 대형사(大型社)가 인수주선업무에 있어서 비교우위(比較優位)를 보였다. 분석기간이 증권산업(證券産業)의 고도성장기였기 때문에 단기적인 효율성(效率性)을 극대화하기 어려웠다는 점과 각종 제도적(制度的) 규제(規制)로 인해 증권회사(證券會社)들이 효율에 입각한 업무다변화(業務多邊化)를 적극적으로 추진하는 데 제약이 있었다는 점 등이 고려되어야 하겠지만 우리나라 증권사(證券社)가 내부경영(內部經營)의 효율성면에서 개선의 여지가 있음을 시사하고 있다. 본(本) 연구(硏究)의 이러한 잠정적 결론에도 불구하고 규모(規模) 및 범위(範圍)의 경제성(經濟性)에 대한 정밀한 분석이 증권업(證券業)뿐만 아니라 타금융업(他金融業)에 대해서도 시도되어야 할 것이며 이러한 연구들은 증권산업(證券産業) 업무영역조정(業務領域調整)을 포함한 제반 정책결정에 기여할 수 있을 것이다.

• Journal of the Daesoon Academy of Sciences
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• v.45
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• pp.1-35
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• 2023

This study aims at determining the meaning of Life in The Canonical Scripture of the Daesoon Thought upon the ontological bases of occidental philosophies; especially upon those of Plato and Bergson. In western philosophy, the word ontology designates investigating the meanings of being, which is derived from the Greek 'onto (being)' and 'logia (logical discourse).' The various meanings of life have been sought from ancient times all over the world, for these are the critical and vital questions that pertain to the nature of human existence. Plato had asserted that life, in his word, soul, had three different kinds of aspects of meaning. Immortal, reciprocal, and divine. Plato scheme was such that the soul could die, but after death it could became reborn into another various forms of living creatures. The real inner life of humans, the soul, would live eternally. Henri-Louis Bergson, a famous French philosopher from the 20^th century, claimed that life had three different kinds of aspects. Self-identity, Élan vital (vital impetus) and liberty. Bergson insisted especially the real meaning of life had been characterized by "unité multiple et multiplicitéune," "unity as something multiple and multiplicity something singular." The meaning of life in Daesoon Thought could be said to have three different characteristics, solidarity, earthly immortality and grievance-resolution. Some similarities can be found between certain western ontological meanings of life and those of Daesoon Thought. Namely, the qualities of eternity, reciprocity, and divinity.

• Management & Information Systems Review
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• v.32 no.5
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• pp.135-155
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• 2013

Corporate primary goal has shifted from profit-orientation toward broader socially motivated perspectives, over the recent year. According to this phenomena, extensive research have been conducted to assess the empirical association between CSR and firm value. However, the results of previous studies are largely indeterminate which are attributed to the ignoring various indeterminate variables between CSR and firm value. Specifically, the purpose of this paper verifies the empirical association between CSR and firm value with considering capital constraint as core moderator variable by using structural equation modeling(SEM). Main results of this paper are as follows. We find that firms with better CSR performance face lower capital constraint and capital constraint is significantly related to firm value in negative direction, also. The result suggest that better CSR performance is associated with superior stakeholder engagement, in turn, CSR initiatives leads to firm value creation. Also, the capital constraint still remain positive to firm value even if capital constraint is considered moderator variables. Our findings implicated that CSR literatures should consider moderator variables, such as capital constraint, which could be affected firm value.