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Park, Jun-Kyu,Park, Aaron,Yang, Si Kyung,Baek, Sung-June,Hwang, Joonki,Choo, Jaebum The Royal Society of Chemistry 2017 The Analyst Vol.142 No.2
<P>In this paper, we consider a novel method for identification of Raman spectra recorded on different instruments with different wavelengths. Since the conventional hit quality index (HQI) is vulnerable to intensity variation, it needs intensity calibration or standardization for each spectrometer, which causes additional time consuming work. To simplify this process and enhance the identification performance, we propose a new scoring method which is defined as the weighted sum of the HQIs from segmented spectra by windowing. To show the effectiveness of the proposed method, the experiments were carried out with 10 kinds of chemicals with their spectra recorded on 3 different instruments with different laser wavelengths. According to the identification results with 14 033 chemicals, the proposed method identified all test chemicals without error, which indicates that the proposed method could be used as a promising alternative to the existing methods.</P>
Park, Jaebum,Kim, Hyung Jin Korean Chemical Society 2016 대한화학회지 Vol.60 No.4
This paper describes the synthesis of alkali metal salts of urea (ureates) and their application to the direct preparation of 4-nitrosoaniline from nitrobenzene via nucleophilic aromatic substitution of hydrogen. Sodium and potassium ureates were readily prepared from the reaction of urea with sodium hydride, metal methoxides, and metal hydroxides. The effect of ureates as nucleophiles on the conversion of nitrobenzene to 4-nitrosoaniline was investigated and compared with that of a urea-metal hydroxide mixture. It was found that the ureates were superior for producing 4-nitrosoaniline owing to their higher thermal stability of the ureate. The ureate obtained from the treatment of urea with sodium hydride gave the highest yield for the preparation of 4-nitrosoaniline. The ureates generated from the reaction of urea with metal hydroxide also gave high yields of 4-nitrosoaniline. Catalytic hydrogenation of 4-nitrosoaniline afforded polymer-grade 1,4-benzenediamine in quantitative yield.
Jaebum Park,김형진 대한화학회 2016 대한화학회지 Vol.60 No.4
This paper describes the synthesis of alkali metal salts of urea (ureates) and their application to the direct preparation of 4-nitrosoaniline from nitrobenzene via nucleophilic aromatic substitution of hydrogen. Sodium and potassium ureates were readily prepared from the reaction of urea with sodium hydride, metal methoxides, and metal hydroxides. The effect of ureates as nucleophiles on the conversion of nitrobenzene to 4-nitrosoaniline was investigated and compared with that of a urea-metal hydroxide mixture. It was found that the ureates were superior for producing 4-nitrosoaniline owing to their higher thermal stability of the ureate. The ureate obtained from the treatment of urea with sodium hydride gave the highest yield for the preparation of 4-nitrosoaniline. The ureates generated from the reaction of urea with metal hydroxide also gave high yields of 4-nitrosoaniline. Catalytic hydrogenation of 4-nitrosoaniline afforded polymer-grade 1,4-benzenediamine in quantitative yield.
박재범(Park, jaebum),박정규(Park, Jeong Kyu) 한국중어중문학회 2014 中語中文學 Vol.59 No.-
Yudafu"s 「沈淪 Sinking」had an immediate impact on the contemporary readers, because of its daring self - exposure, a pure confession and originality, etc, which could not be found in other works of his contemporaries. It is unabasedly autobiographical, and it is filled with all kinds of incidents that Yudafu had met, or all sorts of experiences and feelings that he had had while he was in Japan. Some says that Yudafu was charmed by 「The hypochondria of garden “田園の憂鬱” 」 by Japanese writer Sato Haruo and "I-novel" prevailing at that time in Japan, and his deep concern about them helped Yudafu write 「沈淪 Sinking」. He declared that all literature is autobiographical, and he took to making literature that reflected and imitated everything about himself, including the writer"s own experience, behaviors and feelings. 「沈淪 Sinking」is considered as the first and representative novel that embodied and practiced his literary insistence and creed. In Short, Yudafu wrote「沈淪 Sinking」 through making an exact copy of his real experience and feelings, and imitating the figure of a hero in 「The hypochondria of garden “田園の憂鬱”」 by Japanese writer Sato Haruo. On 「沈淪 Sinking」 was imprinted two kinds of imitation, which reproduced his real experience and feelings, and the figure of a hero in 「The hypochondria of garden “田園の憂鬱”」. So, Yudafu"s 「沈淪 Sinking」is regarded as imitation novel in this paper. What he did imitate from his real life lived during his stay in Japan, and from the figure of a hero in 「The hypochondria of garden “田園の憂鬱”」, is discussed in this paper. To study on the imitative aspects and its literary implication seen in Yudafu"s 「沈淪 Sinking」, being focused on the comparison with Japanese writer Sato Haruo"s 「 Hypochondria of Garden 」, is the main purpose of this paper. Literature, or lierary works, in fact, is the product of language itself, because all kinds of things in literature, including the characters, are expressed and described only with language and words by writers. In order to define the imitative aspects found in 「沈淪 Sinking」 clearly and accurately, this paper uses the theory of the structure of language - signifiant and signifie, proposed by Saussure Ferdinan De, Swiss linguist, who insisted that language is composed of signifiant and signifier, introducing new theory on the structure of language to world. It comes to a conclusion, in this paper, that the first imitative aspects seen in a hero of 「沈淪 Sinking」- maladjustment to his social environment and wandering for sexual desire, drawn from the writer Yudafu"s real experience, behaviors and feelings can be regarded as "signifiant", and the second imitative aspects - a figure suffering from hypochodria and his indulgence and addiction, described after a figure of a hero in 「The hypochondria of garden “田園の憂鬱”」, may be thought of as signifier, since maladjustment to his social environment joins hypochondria (mental depression) and wandering for sexual desire is connected to indulgence and addiction to sex.
산화그래핀(GO)의 플라스틱(PS) 표면 코팅방법에 대한 연구
박재범(Jaebum Park),이지훈(Jihoon Lee),허증수(Jeung Soo Huh),박단비(Danbi Park),임정옥(Jeong Ok Lim) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.2
In this study, we investigated various coating methods of graphene oxide on the surface of a petri dish made of polystyrene and analyzed the physical and chemical properties of the coated surface. For coating, spinning, spraying and pressing methods were attempted. The coated surface was characterized by SEM, Raman Spectroscopy, AFM, FT-IR, UV-Vis Spectroscopy and Contact Angle measurement. By spin coating and spray coating, well distributed graphene oxide in the form of multiple islands on the plastic surface with an average size of 5 to 20㎛ are observed by SEM, and high binding energy between graphene oxide and plastic surface is measured by AFM. In case of hand press coating, graphene oxide of 10μm or more was observed, and low surface energy was measured. By FT-IR and Raman Spectroscopy analysis, surface coating of graphene oxide was confirmed.