열적활성화된 과황산에 의한 염화페놀의 산화분해특성 연구

손지민,권희원,황인성,김정진,김영훈,Son, JiMin,Kwon, Hee-Won,Hwang, Inseong,Kim, Jeong-Jin,Kim, Young-Hun 한국환경과학회 2020 한국환경과학회지 Vol.29 No.1

Oxidative degradation of phenol, three monochlorophenols (2-chlorophenol, 2-CP; 3-chlorophenol, 3-CP; 4-chlorophenol, 4-CP), four dichlorophenols (2,3-dichlorophenol, 2,3-DCP; 2,4-dichlorophenol, 2,4-DCP; 2,5-dichlorophenol, 2,5-DCP; 2,6-dichlorophenol, 2,6-DCP), and two trichlorophenols (2,4,5-trichlorophenol, 2,4,5-TCP; 2,4,6-trichlorophenol, 2,4,6-TCP) was conducted with heat activated persulfate. As the number of chlorinations increased, the reaction rate also increased. The reaction rate was relatively well fitted to the zero-order kinetic model, rather than the pseudo-first order kinetic model for the reactions at 60 ℃, which can be explained by insufficient activation of the persulfate at 60 ℃, and the oxidation reaction of 2,4,6-TCP at 70 ℃ was relatively well fitted to the pseudo-first order kinetic model. The oxidation reaction rate generally increased with increase of persulfate concentration in the solution. 2,6-dichloro-2,5-cyclohexadiene-1,4-dione was found as a degradation product in a GC/MS analysis. This compound is a non-aromatic compound, and one chlorine was removed. This result is similar to the result of previous studies. The current study proved that heat activated persulfate activation could be an alternative remediation technology for phenol and chlorophenols in soil and groundwater.

Le pari de Duchamp - La beauté de l’échec et la nulle la plus idéale -

손지민 프랑스문화예술학회 2019 프랑스문화예술연구 Vol.68 No.-

Marcel Duchamp (1887-1968), joueur invétéré du jeu d’échecs, se voue corps et âme aux beautés comme aux affres du jeu à tel point que son art se redéfinit par la mise en doute de son propre concept. Cet investissement atteignant un point culminant vers 1912 fut non sans des frictions considérables de son processus artistique profondément expérimental dont les résultats se voyaient refusés ou mal compris. À compter du milieu des années 1920, Duchamp perd intérêt dans le processus de l’art ainsi que le milieu artistique en France et aux États-Unis qui entend présenter une oeuvre estampillée de quelconque qualificatif et attirer toute sorte de jugement. Son déploiement échiquéen et ses activités artistiques s’acheminaient vers un but qui peut être résumé ainsi : la liberté par rapport à tout jugement et à l’illusion de la certitude. Pour lui, préétablir un objectif engendre une «répétition neurasthénique» de la croyance, du jugement et de la consommation. Ce qui lui importe absolument, c’est la vérité imprégnée dans la situation sur l’échiquier qui s’anime d’une série de mouvements inventés et conçus par décision logique. Cette dernière est prise sur le spectre intégral et oppositionnel s’étendant entre la logique pure et le pari. Les mouvements vectoriels de la pensée occupent une place centrale dans la notion duchampienne de beau, mais portent le nom d’échecs. Étrangement, il s’efforce, à partir de son indifférence envers la victoire ou la valeur, d’aboutir à une nullité, indifférence qu’il qualifie de «presque utopique». Cette nullité est cependant un objectif ultime de son art et de sa vie.

가용화 기술을 이용한 양마의 항산화 활성 및 유용성분 변화

손지민,아자드 오바이둘 칼람,강위수,신명환,조동하 한국약용작물학회 2017 한국약용작물학술대회 발표집 Vol.2017 No.09

입자크기에 따른 케나프 잎의 항산화 활성 및 유용성분의 비교

손지민,조동하,Md Obyedul Kalam Azad,강위수,박철호,신명환 한국약용작물학회 2018 한국약용작물학술대회 발표집 Vol.2018 No.10

Background : The Kenaf (Hibiscus cannabinus L.) is an annual plant rich in phenolics compound and antioxidant activity. Particle size has an enormous effect on extraction of plant bioactive compound. Therefore, to evaluate the optimum particle size on extraction of bioactive compound from Kenaf was investigated. Methods and Results : Three kind of kenaf leaves; EF-1 and G-1 from Israel and Korea were collected in 2016 and the collected leaves were dried and pulverized are sorted by particle size. After adding 50 ㎖ of 100% ethanol per 0.5 ㎎ of the powder, the powder is extracted in an ultrasonic bath at 30℃ for 1 hour and then stirred for 1 hour at 250 rpm in the wise stirring. After extraction, the extract was filtered using filter paper. In the total polyphenol, flavonoid and antioxidant activity were higher in 100 to 200 ㎛ particle size of Gandae. On the other hand, phenolic compound, falvonoud and antioxidant were higher in 45 to 100 ㎛ particle size of EF-1 and G-1 Kenaf. Conclusion : Based on the results, the Israel varieties showed the best results compared to the Kenaf varieties of Korea. Among them, EF-1 had a particle size of 45 – 100 ㎛ Showed the higher antioxidant activity. It is believed that the smaller the particle size, the larger the specific surface area, which leads to an increase in the extraction efficiency of kenaf.

가용화제 및 고온가압추출에 따른 케나프(Hibiscus Cannabinus L.) 잎의 항산화 활성 및 유용성분의 변화

손지민,아자드 오바이둘 칼람,조동하,강위수,신명환 한국약용작물학회 2018 한국약용작물학술대회 발표집 Vol.2018 No.05

Background : The Kenaf (Hibiscus cannabinus L.) is an annual plant of African and Indian origin. and there are a lot of flavonoids in the leaves. To determine the most suitable method for extracting of Kenaf cosmetic ingredients, the data of changes in polyphenol, flavonoid contents and DPPH radical scavenging activities were analyzed, based on concentration of surfactants and Extraction Methods. Methods and Results : The effect of autoclave extraction (AE) and ultrasonification extraction USE) with hydrophilic surfactant that is Brij35 diluted 15, 25 and 35 mM with water on antioxidant activity of Kenaf was investigated. The leaves of Kenaf; R from Israel were collected in 2016 and the collected leaves were dried and pulverized. The highest polyphenol content of Kenaf extracted was 47.54 ㎎/㎖ as Brij35 20 mM extract from AE after USE. The highest flavonoid content of Kenaf was 20.01 ㎎/㎖ as Brij35 25 mM extract from AE. The Brij35 20 mM extract from AE after USE showed higher DPPH radical scavenging activity than that of the other treatments. Conclusion : Based on the test results, the extracts obtained by AE or AE after USE showed excellent antioxidant activity and effective component than extracts by USE. The results of the DPPH radical scavenging activity and total polyphenol content of the extracts obtained by AE after USE than AE were slightly improved, but there was no significant difference. Therefore, it is considered that the extract obtained by autoclave extraction most effective for use as a cosmetic ingredient.

추출방법에 따른 케나프 잎의 항산화 활성 및 유용성분의 비교

손지민,조동하,Md Obyedul Kalam Azad,강위수,박철호,신명환 한국약용작물학회 2018 한국약용작물학술대회 발표집 Vol.2018 No.10

Background : The Kenaf (Hibiscus cannabinus L.) is an annual plant of African and Indian origin. and there are a lot of flavonoids in the leaves. To determine the most suitable method for extracting of Kenaf cosmetic ingredients, the data of changes in polyphenol, flavonoid contents and DPPH radical scavenging activities were analyzed, based on concentration of Extraction Methods. Methods and Results : 200 ㎖ of distilled water (100% ethanol in the case of ethanol extraction) was added to 20 g of the leaves of Kenaf; G-1 from Israel were collected in 2016 and the collected leaves were dried and pulverized, and five extraction methods were performed. The extraction method and conditions are as follows: pressurized high temperature extraction (AE: autoclave, 121 degrees, 15 minutes), ultrasonic extraction (UE: ultrasonic bath, 60 degree hot water, 1 hour), Hot water extraction (SE: spidulina mayina. 100 degrees 6 hours), Ethanol Extraction (EE: ethanol, spidulina mayina, 80 degrees 6 hours), room temperature stirring extraction (WSE: wise stirring, room temperature 250rpm 24 hours). After extraction, the mixture was filtered using a filter paper, and concentrated under reduced pressure at 40℃ for lyophilization. And diluted to 1,000 ppm with 80% ethanol. Conclusion : Based on the test results, EE method showed the highest results. In the case of using water as the solvent, the SE method showed the highest result. However, the results of the SE and AE methods are not significantly different from each other. Therefore, it is expected that if the extraction conditions of AE method are adjusted, the result of AE method will be higher than that of the SE method.

모노(もの)는 어떻게 예술적일 수 있는가? — 장-마리 셰퍼의 미적 경험 이론을 통해 본 모노하

손지민 서울대학교 인문학연구원 2021 人文論叢 Vol.78 No.4

This article has as its double objective a clarification of art-philosophical problems as dealt with by the theory of Mono, introduced by the late 1960’s Japanese movement Mono-ha, and an examination of the validity of its theory. Lying at the kernel of the above set of problems is the inquiry into the possibility of continuation of aesthetic experience through the means of unworked things. Here, aesthetic experience is referred to by the artists as “ecstasy”, “disparity”, “encounter” and “thrill”. As this article will try to show, all of Mono-ha’s endeavor is noticeably focused on arguing for this continuation and putting it into practice. For this argument to be justified, it is required first that aesthetic experience is distinguished— as opposed to isolated—from the totality of experience that includes it, and that we discuss whether the realization of the above theory based on aesthetic experience can be artistic, despite the irreducibility of the experienced into a work of art. Despite being central to their theory and relevant practice, Mono-ha’s reliance on the notion of aesthetic experience has hitherto been examined as being part of the former rather than culminating in the labor of the latter. This article will attempt to carry out the above tasks by introducing the cognitive psychological research of Jean-Marie Schaeffer into the contexts of the artists’ own words. 본 논고는 일본에서 1960년대 후반 등장한 모노하(もの派)의 모노이론과 그것이 다루는 예술철학적 쟁점들을 명료화하고 해당 이론의 정당성을 검토하는 것을 주된 목적으로 한다. 이 쟁점들은 ‘차용된 모노를 통한 특별한 경험의 지속’으로 추려질 수 있다. 작가들의글과 좌담회 기록이 보여주듯이, 모노하 작가들의 모든 활동과 작업은 이 ‘지속’을 작품으로 실천하고 글과 대담 등을 통해 설명하기 위함이었다고 해도 과언이 아니다. 모노하 작가들은 자신들의 작품에서 느껴지는 미적 경험을 ‘황홀감’, ‘오싹함’, ‘어긋남’, ‘만남’, ‘짜릿함’ 등의 단어로 묘사한다. 또한 그들은 이 미적 경험의 특별함을 예술의 가능 조건 탐색의 시발점으로 삼으려 한다. 이 지속이 예술적실천으로서 정당화되기 위해서는 먼저 미적 경험을 그것을 포함하는 일반적인 의미에서의 감각적 공동 경험과 구분할 수 있는 근거를찾는 일이 수행되어야 한다. 그리고 이 근거를 통해 경험과 예술작품의 비즉각적인, 환원 불가한 관계에도 불구하고 예술의 가능성을 긍정할 수 있는지를 논하는 작업이 필요하다. 위 작가들이 예술의 가능성을 이 특별한 경험에서 찾는데도 불구하고 이 특별함의 근거, 즉미적 경험에 불가피하게 결부되는 주의력, 감정, 대상과의 지향적 관계의 문제들은 그들의 글, 대담 기록과 작품에서 인지과학, 생물학에근거하여 명확히 설명되지 않는다. 이러한 과학적 근거의 부족이 모노하의 예술철학에 대한 비판론들의 근원이라고 해도 과언이 아니다. 본 논문은 이러한 점들을 들어 위 작가들이 말하는 특별한 경험의 특별함의 근거를 모노하 작가들의 전언과 장-마리 셰퍼의 인지심리학적 연구를 교차시키며 이해하고 검토해보려 한다.

순수 휨 하중을 받는 비조밀 플랜지 H형 스텝보의 비탄성 횡-비틀림 좌굴강도

손지민,박종섭 한국방재학회 2012 한국방재학회논문집 Vol.12 No.1

This paper investigates inelastic lateral-torsional buckling of doubly and singly stepped beams with noncompact flange subjected to pure bending. A three-dimensional finite-element program ABAQUS(2007) and a regression program MINITAB(2006)were used to analytically develop new design equation. Ratios of flange thicknesses, flange widths, and stepped lengths of the beam based on a typical section of W14×90 were considered as analytical parameters. Two groups of 27 and 36 cases for doubly and singly stepped beam, respectively, with a total of 252 case, were analyzed in the inelastic buckling range. The combined effects of residual stresses and geometrical imperfection on inelastic lateral-torsional buckling of beams are considered. The new proposed equation will definitely improve the current design methods for the inelastic lateral-torsional buckling problem and will increase the efficiency in building and bridge design. The solution can be easily used to develop new design equations for inelastic lateral-torsional buckling resistance of stepped beams subject to general loading condition such as a concentrated load, a series of concentrated loads or uniformly distributed load. 본 논문에서는 비조밀 플랜지가 사용된 H형강 휨부재에 양단 또는 일단 플랜지 보강된 스텝보에 순수 휨 하중을 받는 경우의 비탄성 횡-비틀림 좌굴에 관한 연구를 수행하였다. 3차원 유한요소 해석 프로그램 ABAQUS(2007)가 사용되었으며, 회귀분석 프로그램 MINITAB(2006)을 이용해 휨강도를 평가하기 위한 간편 설계식을 제안하였다. 해석에 사용된 비조밀 단면은W14×90 단면을 기본으로 하였으며, 양단 또는 일단 스텝보 계수는 길이방향비, 플랜지 너비방향비 및 두께비로 나타내었다. 양단 스텝보의 매개변수는 27개, 일단 스텝보는 36개의 매개변수와 비탄성 범위내 4가지 비지지 길이를 고려하여 총 252개의유한요소해석을 실시하였다. 하중 조건으로는 양단에 균일모멘트가 작용하는 것을 고려하였으며, 비선형 해석을 위해 잔류응력및 초기변형을 고려하였다. 본 연구를 통해 제안된 휨강도 산정식은 경제적이고 합리적인 설계에 쉽게 적용 가능할 것이며, 다양한 하중조건을 가지는 양단 또는 일단 계단식 단면 변화보의 비탄성 횡-비틀림 좌굴 강도 설계식 개발에 적극 활용 될 수있을 것이다.

주요국의 의료기기 품목 분류체계 조사분석을 통한 국내 의료기기 품목 신설 및 세분화 연구

손지민,유강현,김유림,권경민,이희성,장원석 대한의용생체공학회 2023 의공학회지 Vol.44 No.1

With the international change in the medical device market owing to the development of innovative med- ical engineering and the use of various raw materials, a systematic and rational medical device classification system is needed to safely manage newly developed medical devices. This study aims to improve the domestic medical device classification system by proposing product establishment and segmentation. It is based on medical device products from the United States and Europe that are only available in foreign systems and are more subdivided than domestic products. This study analyzes and compares the domestic and foreign medical device classification systems by examining laws, guidelines, and analysis reports in Korea, the United States, and Europe. In accordance with prod- uct establishment and segmentation criteria, products subject to improvement are presented. This study contributes to safely managing medical devices that do not fit with the current classification system and to solving the confusion caused by the lack of international harmony in product classification systems.

Le retour à l’expérience esthétique face au coefficient d’art - la cause du refus de Marcel Duchamp -

손지민 프랑스문화예술학회 2022 프랑스문화예술연구 Vol.79 No.-

Cet article a pour but d’apporter un éclairage différent sur l’art de Marcel Duchamp à l’aune de la théorie récente de l’expérience esthétique du philosophe analytique Jean-Marie Schaeffer. La problématique centrale dans cet éclairage est de comprendre les visées de l’art de Duchamp comme un prolongement de son art qu’il s’est constamment efforcé de refuser et de critiquer. D’un côté, l’objet de son refus est toute activité artistique, y compris la sienne, influencée par toute tradition esthétique se basant sur les croyances et les notions subjectives. De l’autre côté, ses visées artistiques consistent à faire de la béance indélébile entre son expérience esthétique et sa continuation en œuvres son sujet principal de réflexion et de pratique. Tandis que l’esthétique philosophique occidentale moderne depuis Kant a toujours tendu à formuler le beau à partir des données des sens pour arriver ultimement à un jugement esthétique, la théorie de l’expérience esthétique a pour but l’interrogation neurophysiologique sur des facteurs internes qui rendent ‘spéciale’ lesdites données avant tout jugement. Le terme «esthétique» ici désigne le caractère de toute expérience conative qui permet à l’artiste l’usage atypique de l’attention et la sensibilité. Une étude plus minutieuse sur ce caractère fait manifester une homologie – démontrable à travers les méthodes de la science cognitive psychologique – entre l’expérience et l’œuvre qui la véhicule en matériau. Cet article porte un regard inédit sur le rôle de l’expérience esthétique dans l’art de Duchamp, mis en évidence dans ses œuvres aussi bien que ses entretiens et textes.