A facile route for growth of CNTs on Si@hard carbon for conductive agent incorporating anodes for lithium-ion batteries.

Kim, Chanhoon,Choi, Sinho,Yoo, Seungmin,Kwon, Dohyoung,Ko, Seunghee,Kim, Ju-Myung,Lee, Sang-Young,Kim, Il-Doo,Park, Soojin RSC Pub 2015 Nanoscale Vol.7 No.26

<P>Conductive agent incorporating Si anodes consisting of directly grown carbon nanotubes on hard carbon encapsulating Si nanoparticles were prepared by a one-pot chemical vapour deposition process. Owing to this fabulous structure, Si-based anodes exhibit excellent cycle retention and rate capability with a high-mass-loading of 3.5 mg cm(-2).</P>

Synthesis of CdZnSe Quantum Dots in Aqueous Phase by Microwave Irradiation

Kim, Dohyoung,Kim, Jongsung American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.8

<P>Recently many kinds of quantum dots were prepared by using microwave irradiation. Microwave irradiation provides rapid heating of polar substance and consequently results in faster, cleaner, and more efficient reactions than conventional heating process. In this study, alloyed CdZnSe quantum dots (QDs) have been synthesized in aqueous phase by microwave irradiation using 3-mercaptopropionic acid (MPA) as a stabilizer. Cd(NO3)(2), Zn(NO3)(2) and NaHSe were used as Cd, Zn and Se precursors, respectively. The process parameters such as Zn/Cd molar ratio, reaction pH and reaction time were varied to prepare CdZnSe QDs and photoluminescence (PL) dependence was studied. A strong PL emission peak was observed from the QDs prepared in weak acid conditions. As the reaction time increased, the absorbance spectra of the QDs were red shifted with increase of the intensity.</P>

The ‘prohairesis’ in Aristotle’s Ethics

Dohyoung Kim 한국서양고전학회 2013 西洋古典學硏究 Vol.52 No.-

This paper deals with the notorious question whether the conclusion of deliberation, in Aristotle, is action or not. I am, through the study on what Aristotle wants to mean by the technical term ‘prohairesis’, providing an answer to the question just mentioned. It is not very controversial that, in Aristotle, prohairesis is what we get as an outcome of deliberation (bouleusis) or practical thought (dianoia praktike), and that the conclusion of deliberation is a combination between reason (nous) and desire (orexis). However, what always baffles commentators is the question regarding what Aristotle means by the statement that the conclusion of deliberation is the combination of the desiderative and the conceptual elements of the soul. Scholars such as Elizabeth Anscombe (1965), Norman Dahl (1984), and Martha Nussbaum (1978) have argued that the result is an action, thinking that the relationship between reason and desire is here of such a nature that prohairesis becomes an actual action. I disagree with this conclusion. For, such a reason-desire combination itself ? albeit true for the nature of deliberation ? cannot let Aristotle’s deliberation be a thought in which there is a substantial force needed to initiate an action, but also, does Aristotle not employ the term ‘prohairesis’ to mean that which actually initiates action. I argue that when Aristotle mentions such a combined nature of prohairesis, he means to say no more than that the prohairesis is the conclusion of deliberation in which reason and desire have already been brought together. My claim is the following: prohairesis results from a reason-desire combination only in the sense that it is a part of a deliberation that already contains both a conceptual and a desiderative element. Hence, the thesis of our opponents that the combination of reason and desire is the nature of what enables prohairesis to be an action, is unacceptable. Consequently, I provide an alternative explanation on prohairesis. I argue that it is not an action itself, but a decision and a combination of the best comprehension (nous-element) of what to do and the correct intention (orexis-element) that follows from it.

Bipolymer-Cross-Linked Binder to Improve the Reversibility and Kinetics of Sodiation and Desodiation of Antimony for Sodium-Ion Batteries

Kim, Dohyoung,Hwang, Chihyun,Jeong, Jihong,Song, Woo-Jin,Park, Soojin,Song, Hyun-Kon American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.46

<P>Although the volume of antimony tremendously expands during the alloying reaction with sodium, it is considered a promising anode material for sodium-ion batteries (SIBs). Repeated volume changes along the sodiation/desodiation cycles encourage capacity fading by triggering pulverization accompanying electrolyte decomposition. Additionally, the low cation transference number of sodium ions is another hindrance for application in SIBs. In this work, a binder was designed for the antimony in SIB cells to ensure bifunctionality and improve (1) the mechanical toughness to suppress the serious volume change and (2) the transference number of sodium ions. A cross-linked composite of poly(acrylic acid) and cyanoethyl pullulan (pullulan-CN) was presented as the binder. The polysaccharide backbone of pullulan-CN was responsible for the mechanical toughness, while the cyanoethyl groups of pullulan-CN improved the lithium-cation transfer. The antimony-based SIB cells using the composite binder showed improved cycle life with enhanced kinetics. The capacity was maintained at 76% of the initial value at the 200<SUP>th</SUP> cycle of 1C discharge following 1C charge, while the capacity at 20C was 61% of the capacity at 0.2C, implying that the composite binder significantly improved the sodiation/desodiation reversibility of antimony.</P> [FIG OMISSION]</BR>

Synthesis of Cu-In-S/ZnS Quantum Dots in the Aqueous Phase by Microwave Irradiation

( Dohyoung Kim ),( Jongsung Kim ) 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

Recently various nano materials have been prepared by using microwave irradiation (MW). Microwave irradiation generates rapid heating of polar substance and consequently results in faster, cleaner and more efficient reactions than conventional heating method. In this study, water soluble Cu-In-S/ZnS core/shell quantum dots (QDs) were successfully synthesized in the aqueous phase by MW. L-Asorbic acid and Trisodium citrate dehydrate were used stabilizer between indium and copper ions. The optical properties of the preparation QDs were characterized by photoluminescence spectroscopy and UV/Vis spectroscopy. The chemical structure of the QDs were characterized by XRD and Energy dipersive X-ray spectroscopy. With the increase ZnS shell size, PL peak of the QDs was red shifted.

The Requirements for Aristotle’s Political Expertise and its Goal

Dohyoung Kim 한국서양고전학회 2018 西洋古典學硏究 Vol.57 No.3

In several passages in Aristotle’s Ethica Nicomachea he mentions what kind of person is appropriate to take his lecture on political science, the study on how to build the best polis, that is, the most happiest nation. This discussion on the so-called requirements to understand and meaningfully use the contents of Aristotle’s political science can help us to figure out the goal of his lecture on political expertise. Some scholars argue that having the natural excellence without practical wisdom is the only requirement for taking his lecture in question and thereby that the goal of his lecture on it is to provide practical wisdom to the audience who only possess the natural excellence, but lack phronēsis. However, against them, we claim that, according to Aristotle, there are two distinctive requirements for his lecture on political science, the excellence of character and practical wisdom, and that the goal of his lecture on political science is to teach the audience on how to make the best law system to build the best polis rather than to make them phronimos.

가상시뮬레이터 기반에서의 시나리오 기반 자율주행 차량 안전성 검증방법 연구

김도형(Dohyoung Kim),우준상(JunSang Woo),최준범(Joonbeom Choi),곽만기(Manki Kwak) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11

아리스토텔레스 중용 개념에 관하여 -‘반응우선성 논지’에 대한 하나의 논박-

김도형(Dohyoung Kim) 한국철학회 2020 철학 Vol.- No.145

성격적 탁월함의 본성(physis)을 설명하기 위해 아리스토텔레스가 도입하는 중용은 두 가지 차원에서 언급된다. 하나는 행위자의 품성 상태(hexis)의 차원에서, 다른 하나는 그 행위자가 구체적 상황에서 행하고 표출하는 개별적 행위와 감정의 차원에서 제시되는 것이다. 우리는 전자를 ‘반응으로서 중용’, 후자를 ‘상태로서 중용’으로 구분할 수 있다. 그런데, 아리스토텔레스가 성격적 탁월함을 설명하기 위해 도입한 중용 개념은 본질적으로 어떤 차원의 중용일까? 일단의 연구자들은 탁월한 사람이 중용적인 이유는 그의 개별적 행위와 감정의 중용적 속성에 기인한다고 전제하면서, 아리스토텔레스가 궁극적으로 의미하는 중용은 ‘반응으로서의 중용’이라고 주장한다. 이러한 입장을 우리는 ‘반응우선성 논지’로 부를 수 있다. 이 글에서 우리는 ‘반응우선성 논지’가 많은 학자들에 의해 주목받고 있기는 하지만, 간과할 수 없는 중요한 오류를 다수 내포하고 있음을 밝히고, 이에 재고의 필요성을 제기할 것이다. Aristotle, it is said, mentions the mean(mesotēs; to meson) employed to explain the nature of moral virtue(ēthikē aretē) in two different dimensions. One is in the dimension of the disposition(hexis) of an agent or one’s soul, but the other is of individual action and emotion(pathos) the agent acts and suffers. We can label the former ‘the mean as a response’, the l atter ‘the mean as disposition.’ However, between these two, which one is the essential sense of the mean in Aristotle? A group of scholars argues that a virtuous agent is in a mean disposition because his or her action and emotion possess ‘somewhat mean trait’. Therefore, they claim that, between two levels of the mean mentioned, the essential sense of the mean in Aristotle is ‘the mean as a response.’ For convenience, we call this position ‘the response-priority argument.’ In this article, we suggest that although this ‘response-priority argument’ is a recently favoured interpretation on Aristotle’s doctrine of the mean, it contains several exegetical problems that are crucial, so we should reconsider the reliability of that interpretation seriously.

지역난방 첨두부하보일러 대류전열부 바닥면 열전달률 변화 연구

김도형(Dohyoung Kim),김태현(Taehyun Kim) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.-

아리스토텔레스의 중용론에 관하여 - 중도론적 해석에 대한 비판 -

김도형 ( Kim Dohyoung ) 한국윤리학회(구 한국국민윤리학회) 2019 倫理硏究 Vol.124 No.1

성격적 탁월함(ethike arete)은 ‘지나침과 모자람 사이의 중용적 상태(mesotes)’라는 이론적 정의를 제시하는 『니코마코스 윤리학』 2.6의 논의를 연구자들은 통상아리스토텔레스의 중용론이라고 부른다. 그런데 이 ‘중용적 상태(mesotes)’의 ‘진의(眞意)’는 무엇일까? 일부 연구자들은 ‘아리스토텔레스가 이런 논변을 통하여 ‘우리가 처하게 되는 일상에서 최선이자 이상적인 선택은 필연적으로 중도적 행위와 감정이므로, 우리는 항상 이런 중도를 잘 파악하고 추구해야 한다’고 말하는 것으로 주장한다. 필자는 이런 입장의 대표자인 Kraut(1989)의 중도론적 해석을 비판한다. 먼저 크라우트의 주장을 분석하여 그의 주장의 근저에 있는 전제들이 무엇인지 전제가 보일 것이다. 그리고 EN 2.1~2.6의 맥락 분석을 통해 중용론이 ‘실천적 지침’이며, 중용 개념의 본질적 의미가 개별적 행위와 감정에 있다는 크라우트의 전제 및 주장이 잘못되었음을 논증할 것이다. 그리고 아리스토텔레스가 ‘중용적 상태’(mesotes)라는 표현의 진의가 무엇인지 필자의 고찰을 제시하며 이 글을 마칠 것이다. This paper is about a question, what Aristotle intends to say through his doctrine of the mean. Richard Kraut in his book, Aristotle on Human Good (Princeton, 1989), claims the following: the doctrine of the mean has been provided as a substantial guide for excellent action, so what he wants to describe predominantly in it is actions and emotions in particular circumstances. Also since those actions and emotions are necessarily between doing as much as possible and doing nothing, what he wants to deliver through his discussion on the mean is not significantly different from the message of the doctrine of moderation, that is, medio tutissimus ibis. However, we disagree. To criticise Kraut, first of all, we show, through our analysis on Aristotle’s discussion on habituation and the excellence of character in general, that Kraut’s fundamental premise - Aristotle’s doctrine of the mean has been provided as a practical guide for action in particular circumstance- is problematic. Secondly, we criticize his another argument that through the concept of mesotes Aristotle primarily indicate individual action(praxis) and emotion(pathos). Finally, having explained why Aristotle uses the expression ‘(mesotes)’ on the character or disposition and what he intend through applying that explanation onto such abstract concepts, we conclude this paper.