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이성범,정창주,노상하,Lee, Sung Bum,Chung, Chang Joo,Noh, Sang Ha 한국농업기계학회 1983 바이오시스템공학 Vol.8 No.1
The milling process is considered as causing one of the greatest grain losses among all the processes in rice post-production. Major source of grain losses in the rice milling is considered as the whitening process. This study was attempted to develop an abrasive-type whitener, the whitening chamber of which being supplied by jet-air evenly and continuously. To investigate the milling performance by the new whitener, three kind of emery-stone grit(#36, #41, and #46), and three levels of rotational speed of emery stone roller (950, 1070, and 1200 rpm) were tested. The jet-air abrasive-type whitener was also compared with the conventional abrasive-type having no jet-air blower in terms of their milling performance. In addition, the effect of different combinations of sequential uses of the abrasive- and friction-type whiteners on the milling performance was also experimentally evaluated. The results of this study are summarized as follows; 1. In general, the whitening system combined with the abrasive type whitener with jet-air supply, which was newly designed, and the existing jet-air friction type whiteners produces more milled- and head-rice by about 0.3% points and 2.8% points, respectively than the system combined with the existing abrasive type without the jet-air supply under the same operational conditions. The former also consumed less electricity by 0.024 KwH per 100kg of milled rice production and gave more milling capacity by about 35 kg/hr. As compared with the conventional whitening system consisting of jet-air friction type whiteners only, the former yielded more milled- and head-rice by 1.5% points and 4.4% points, respectively. 2. The abrasive roller having 46 grit emery was better than the roller having 36 grit in aspects of milling performance and machine efficiency, in general. 3. With regard to the effect of combination method of abrasive type and friction type whiteners, one pass in abrasive type plus three passes in friction type gave better milling performance and energy efficiency than the two passes in abrasive type plus two passes in friction type regardless of the designs of the emery stone rollers. 4. The increase in rotational speed of the emery stone roller from 950 rpm to 1200 rpm presented negative effects on milled and head-rice yields and machine efficiency, but slightly positive effect on milling capacity.
분말활성탄을 이용한 극미량 농도 Nitrosomethylamine의 흡착 제거
이성범,윤여민,최창규,김문일,Lee. Sung-Bum,Yoon. Yeo-Min,Choi. Chang-Kyoo,Kim. Moon-Il 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
Recently, the results of vital tissue test showed that nitrosodimethylamine (NDMA) as a disinfection by-product (DBP), could be regarded as a carcinogen because a tumor was observed in organs. U.S.EPA indicated 0.7 ng/L as exposure concentration of NDMA based on a risk assessment target with a lifetime cancer risk of <TEX>$10^{-6}$</TEX>. Several recent studies have shown that UV oxidation could remove NDMA. However, UV oxidation is uneconomical and can reform NDMA after treating. In addition, the treatment mechanism of adsorption has not been founddue to the uncertainty of NDMA pathway. In addtion, NDMA has a radioisotope <TEX>$^{14}C$</TEX>-labeled which can be analyzed at low concentration of NDMA by Liquid Scintillation Counter (LSC). This study has investigated NDMA determination using LSC at an extremely low range from 1 to 100 ng/L and NDMA removal by powdered activated carbon (PAC) adsorption. For <TEX>$^{14}C$</TEX>-NDMA by LSC, the highest correlation over 99% between count number and NDMA concentrationwas obtained with possibility of <TEX>$^{14}C$</TEX>-NDMA concentration up to 1 ng/L. In the presence of PAC ranging from 50 to 10,000 mg/L, <TEX>$^{14}C$</TEX>-NDMA was removed from 18% to 97% for Sigma-Aldrich corporation (S-A co.) and from 9% to 93% by PAC for Daejung corporation (Dj co.). Hence it was found that the removal efficiency by PAC adsorption could vary depending on PAC types from different companies. For PAC adsorption capacity of <TEX>$^{14}C$</TEX>-NDMA using the Freundlich isotherm, <TEX>$K_f$</TEX> and 1/n of PAC from S-A co. were <TEX>$2.67\times10^{-3}$</TEX> ng/mg and 1.009, while those of PAC from Dj co. were <TEX>$1.30\times10^{-3}$</TEX> ng/mg and 0.994, respectively. Thus, PAC from S-A co. showed twice higher adsorption capacity than Dj co.
비선형 점탄성 부싱모델의 회전방향모드에 대한 실험적 연구
이성범 ( Seong Beom Lee ),이성재 ( Sung Jae Lee ),전성철 ( Sung Chul Jun ),송동률 ( Dong Ryul Song ),정재영 ( Jae Young Jeong ),박찬석 ( Chan Seok Park ),이우현 ( Woo Hyun Lee ) 한국고무학회 2008 엘라스토머 및 콤포지트 Vol.43 No.1
자동차 부싱은 차체로 전달되는 하중을 줄여주는 역할을 하는 자동차 현가장치의 주요부품으로 바깥쪽 슬리브와 안쪽의 축 사이에서 가운데가 비어 있는 실린더의 형상을 가진다. 차축에 작용되는 힘과 모멘트에 대한 부싱의 상대변위 및 변형각도는 점탄성 성질을 나타내며, 부싱에서 힘과 모멘트와 이에 대한 변위와 변형각도의 관계는 다물체 동역학 시뮬레이션에 매우 중요하다. 본 연구는 자동차 부싱의 회전방향 모드에 대한 모멘트와 변형각도의 점탄성 관계를 변형각도에 의존하는 모멘트 완화함수를 통하여 부싱모델을 완성하였으며, 완성된 점탄성 부싱 모델은 회전방향 모드에 대한 실험값과 비교하여 검증하였다. A bushing is a device used in automotive suspension systems to reduce the load transmitted from the wheel to the frame of the vehicle. A bushing is a hollow cylinder, which is bonded to a solid steel shaft at its inner surface and a steel sleeve at its outer surface. The relation between the force and moment applied to the shaft and the relative deformation and rotational angle of a bushing exhibits features of viscoelasticity. Since a moment-rotational angle relation for a bushing is important for multibody dynamics numerical simulations, the simple relation between the moment and rotational angle has been derived from experiment. It is shown that the predictions by the proposed moment-rotational angle relation are in very good agreement with the experimental results.
이성범 ( Sung Bom Lee ) 서강대학교 언어정보연구소 2011 언어와 정보 사회 Vol.15 No.-
The present study is an attempt to provide an analysis of TV subtitles from a linguistic point of view. Subtitles were first introduced to television programs in order to help those hearing- impaired viewers understand the oral contents of a program. However, they are now used very extensively for a variety of purposes beyond that public service, e.g., to arouse the viewers` interest and enhance the effect of the program. Thus, encoding and watching TV subtitles can be considered as a communicative act between the actors or the editors of the program and the viewers watching them. This study explores the functions and characteristics of the subtitles of two popular TV programs in Korea from the viewpoint of participant roles involved in the communicative act.
이성범(Sungbum Lee) 한국영미문학교육학회 2017 영미문학교육 Vol.21 No.1
Literature teachers in Korean universities nowadays are pressured to educate literature through a new kind of paradigm. Interdisciplinary education lies at the heart of pedagogic shift. This essay explores the economy of literature so as to bring the advantages of cross-disciplinary teaching to the fore. In order to specify my argument, I first focus on the interplay of Romantic literature and economics. I discuss moral economy in Wordsworth’s poetry and the economy of aesthetics in Keats’s poetry. Then, I compare John Stuart Mill’s On Liberty with Peter Thiel’s Zero to One in order to help students improve their abilities to apply their understanding of the economy of literature in the context of current socio-economic phenomena. Wordsworth and Keats’s poems provide good examples for teaching the utility of literature to undergraduate English majors. In “The Old Cumberland Beggar,” Wordsworth blames contemporary political economists for eliminating moral considerations in their economic policies. While he stresses the social usefulness of charity in the poem by arguing that the existence of the Cumberland beggar reinforces social bonds in a local community, we need to note that Wordsworth gives particular attention to the beggar’s neighbors who take advantage of their charity towards him merely to improve their own moral qualities. Accordingly, we see what Max Weber describes as “the elective affinity” between Wordsworth’s view of morals and laissez-faire capitalism. The egoistic turn of charity thus conspires with capitalism in pursuit of private interests that Wordsworth condemns. Keats’s work focuses on the economy of aesthetics. “Ode on Indolence” celebrates laziness pitted against productive labor. Here Keats seeks out what he calls “diligent indolence.” This oxymoronic phrase implies that Keats capitalizes on aesthetic activities opposed to physical labor. In other words, he desires aesthetic capital. In “On First Looking into Chapman’s Homer,” Keats precisely expresses his desire for this new kind of capital. He is aware that George Chapman’s translation of Homer’s works into English is more inspiring than Alexander Pope’s. Keats is fascinated by Chapman’s touching paraphrases and recognizes the value of language. He sees wording and phrasing themselves as desirable objects for his own poetic property. As shown in Wordsworth and Keats’s poems, Romantic writers thematize moral or aesthetic capital as distinct from material capital. Through interdisciplinary education, an English literature instructor can encourage his or her students to develop a cross-disciplinary way of thinking. Comparing Mill’s valuation of individuality with Thiel’s argument for the differentiation of goods helps students to utilize their knowledge about the economy of Romantic literature in current times. Becoming accustomed to such study will help students apply interdisciplinary thoughts to contemporary social issues as well as literary texts.