Development of Real Monitoring of Algal Toxins using Multi Functionalized Auto Sampler with Online LC/HRMS

Jaewon Choi,Wonseok Choi,Yuns Kim,Ilhwan Choi,Yongyeon Kim,Wonkyung Lee,Moondon Choi,Jongsu Park 대한환경공학회 2015 대한환경공학회 학술발표논문집 Vol.2015 No.10

Fast and Accurate Determination of Algal Toxins in Water Using Online Pre-concentration and UHPLC-Orbitrap Mass Spectrometry

( Jae-won Choi ),( Won-seok Choi ),( Yuns Kim ),( Sun-hong Lee ),( Jonathan Beck ),( Jennifer Massi ) 한국환경분석학회 2018 환경분석과 독성보건 Vol.21 No.1

Concerns over algal toxins have been growing recently due their impact on rivers and drinking water treatment plants. The current accredited method allows conventional SPE and online SPE. These sample preparation techniques have no difficulty in achieving the LOQ of the guideline. SPE materials suitable for algal toxins are most commonly used with HLB-based sorbents with C18. On the other hand, MS/MS, which is a tandem MS, is the most widely used mass spectrometry method, but a full scan MS which has a high resolution (HR) and high accuracy performance also has a great advantage. The combination of online SPE and Orbitrap MS applied in this study provided a rapid and automated pretreatment method and precise and sensitive quantification of the detected compounds. The recovery rate was 83.9-113.7% and the PQL was 0.03-0.11 ng/mL. Determination of the family compounds of algal toxins is also very easy with an HR full scan MS and retrospective data review with a single measurement also has a big advantage.

A 1.0-ns/1.0-V Delay-Locked Loop With Racing Mode and Countered CAS Latency Controller for DRAM Interfaces

Hyun-Woo Lee,Hoon Choi,Beom-Ju Shin,Kyung-Hoon Kim,Kyung-Whan Kim,Jaeil Kim,Kwang-Hyun Kim,Jong-Ho Jung,Jae-Hwan Kim,Eun-Young Park,Jong-Sam Kim,Jong-Hwan Kim,Jin-Hee Cho,Namgyu Rye,Jun-Hyun Chun,Yuns IEEE 2012 IEEE journal of solid-state circuits Vol.47 No.6

<P>The digital delay-locked loop (DLL) with racing mode and the countered column address strobe (CAS) latency controller are proposed in this paper. The dual-DLL architecture with racing operation is adopted to achieve low power consumption, low jitter, fast locking, wide range of locking, and stuck-free control. The merged dual coarse delay line (MDCDL) reduces the dynamic power consumption of a variable delay line by 30% by sharing a part of the delay line path in DLL. In addition, jitter is reduced by 45 ps in the 1066-DDR3 operating mode by MDCDL. The proposed DLL utilizes an or-and functioned duty cycle corrector (or-and DCC), which consumes 15% of DLL's power, 0.915 pJ/Hz at tCK=1.5 ns and VDD=1.575 V. The countered CAS latency controller (CCLC) saves IDD3N current because it does not need a DLL clock and does not need to be activated for IDD3N (active non-power down) state. The DLL clock is enabled and CCLC is activated only when the read command is issued. This operation condition saves the IDD3N current by 60% with the proposed DLL. The proposed DLL is employed in 128 M×8 DDR3 SDRAM and 64 M×16 DDR3 SDRAM. The former and the latter are fabricated by 5×nm and by 4× nm DRAM process technology, respectively. Experimental results show that ±10% duty error of the external clock can be corrected to within ±2% duty error in less than 512 cycles of locking time under 1.5 ns of tCK. The proposed DLL and CCLC can operate above 1.0-GHz operating frequency at 1.2 V in 5× nm DDR3 SDRAM and at 1.0 V in 4× nm DDR3 SDRAM, respectively. The proposed DLL fabricated with 4× nm technology consumes 6.1 pJ/Hz at 1.575 V.</P>

경계인으로서의 윤동주와 본향의 자리

윤지은(Yun, Ji-eun) 한국근대문학회 2017 한국근대문학연구 Vol.18 No.2

윤동주와 그의 시세계를 재구성하는 과정에서 주목되는 것은 그에게 영향을 준 외부적 요인을 살피는 작업이다. 이 작업은 윤동주 작품의 창작 시점과 발표 시점이 시차를 갖기 때문에 당대의 맥락을 필수적으로 살펴야 한다는 점, 과작을 했던 만큼 시인의 시세계 전반을 구성하기 위해서 영향관계에 있던 요인을 빠짐없이 조망할 필요가 있다는 점 등에서 중요하다. 이러한 문제의식에서 출발하여, 본고는 윤동주의 애송가 〈黑人의 望鄕歌〉를 새롭게 소개함으로써 시인의 이력을 세밀하게 조직해보고자 했다. 번안곡인 〈黑人의 望鄕歌〉는 미 대륙에 끌려온 아프리카 흑인노예가 그의 고통을 위로받을 공간인 유토피아적 고향을 불러내는 노래다. 나아가 노래와 시의 관련성을 토대로 윤동주 시에 나타난 ‘고향’의 의미를 해명하였다. 윤동주 시에서 고향은 부조리한 현실을 뛰어넘어 진정한 자유를 성취할 수 있는 미래에 대한 욕망을 포함한 공간이다. 이 공간은 ‘진정한 고향’ 혹은 ‘본향’으로 구체화된다. 제국 일본과 식민지 조선, 그리고 간도라는 중층의 경계를 의식했던 윤동주에게 ‘진정한 고향’을 형상화하는 것은 현실에 저항하고 시대를 전복하려는 혁명적인 시도였다. The external factors that affected Yun Dong-ju’s poetry and poetics attract much attention when we study his poetry. The most important of such external factors is the contemporary context of Yun’s writing. This is because the time when he composed poetry was different from the time when he published it. Furthermore, the poet’s works are few, thus the external factors must be carefully examined iso that we can construct Yun’s whole poetry. Taking this issue of order of composition as its starting point, this paper discovered Yun’s favorite song 〈黑人의 望鄕歌〉, and organized his career in detail. 〈黑人의 望鄕歌〉 was a song based on African-American Spiritual 〈Carry me back to old Virginny〉. This song is about black slaves in America wishing to return to their homeland. Based on the relationship between 〈黑人의 望鄕歌〉 and Yun’s poetry, this paper explains the meaning of ‘home’ in Yun Dong-ju‘s poetry. In Yun’s poetry, home is a place that embeds the desire for the future that can achieve true freedom beyond the absurd reality. Yun Dong-ju defines this space as the ‘true home’ or ‘homeland’. It was a revolutionary attempt to overthrow the era’s oppressors and resist their reality, who was conscious of the boundary between the imperial Japan, the colonial Joseon, and Gando.

조형예술의 측면에서 본 윤이상의 주요음(향)작곡

윤신향 한국음악학학회 2004 음악학 Vol.11 No.-

This study tries to investigate the relation between maintone(sound)-composition of Isang Yun and formative arts. The first two chapter summerize the music historical primise for the integrative-artistic aesthetic and the process of establishment of Isang Yuns identity as a composer in europe. Therby it is characteristic, that Yun is interested in the relation between music and pictures, while the western composers in the 1950s deal with graphical music and accidental music: the compositional situation tends to weaken the traditional note system, to expand the traditional instrumental medium, and to dismantle the traditional genre. The third chapter describes the relation between the formative image of west side in the acient tomb mural 'Sasindo', which is an about 1500 years old Korean traditional heritage. The line image of this mural is similar with the line image, which Yun draws in the dialog with the japanese composer Nishimura Akira about his maintone(sound)-model. An archetype of this line image is implemented in the beginning of the piece <flute-etu¨de>(1974) in the first section, and it is transformed in the beginning of the fifth section of the same work. Specially amorphous form ending of the maintone(sound)-model displays in this part an expanded form. The expansion of the amorphous form at the end of the maintone-model occurs also three times in <Re´ak>(1966). It is deduced, that this amorphous part form shaws alike in <Images> as a connecting part of the sound-surface. The last two chapter deal with the means of change the Korean traditional format image to modern sound. Yun saw always the picture of the mural in his living room and emphasized the line image of this picture in the explanations of his work, and draw this form in the air in the introduction of play. This phenomen is interpreted under two aspects: at one hand side, the image depicts the taoistic thouhgt, which Yun himself wont to identify with his work. On the other hand side, the connection of Yun's music with a Korean traditional image shaws the fusion aspect of composer. The formative essence of maintone(sound) based on spatial form. The formative mean is created through tile fusion of the line and colorful images. This aura of an image is consistently and endless open. As a result, his maintone(sound) -composition can be interpret as a try to form of an Asian image in the real space 'modern'.

윤이상의 주요음기법을 통하여 나타난 도교사상(Interludium A를 중심으로)

양윤선 ( Yun Seon Yang ) 한국피아노학회 2009 피아노음악연구 Vol.3 No.-

Isang Yun is one of the great artists from 20th century who combined East Asian art and philosophy to Western music, and produced a music that is performed by Western instruments. In Germany, he got the title of `The Most Important 56 composers in 20th century`, `Living 5th Composer in Europe`, and `The Most Important Composer in 20th century`. Isang Yun`s musics are considerable to European artists. His musics contain unique characteristics in which artists from Europe can not modify. Isang Yun who recognized Western and Eastern culture in a principle of music got spotlight from European musicians. Ideas Isang Yun focused on are Taoism, Buddhism, and `tone` concept from East Asia. He concentrated especially on Taoism. Idea of `Hauptton` which is basis of Isang Yun`s music originated from Eastern sound concept. Therefore, this thesis will be discussed on musical presentation and Taoism that are indulged in Isang Yun`s music through "Interludium A". This piece was created with creativity and unique characteristics of Isang Yun. His life in Korea and Europe, style of music during his life time, what is Taoism and balance of yin and yang, and analysis of hauptton in each parts will be discussed to prove the understanding and hidden meaning of "Interludium A".

Hydroisomerization of n-Dodecane Over Pt/Al-MCM-48 Catalysts

Yun, S.,Park, Y.-K.,Jeong, S.-Y.,Han, J.,Jeon, J.-K. American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.4

The objective of this study is to evaluate the catalytic potential of Pt/Al-MCM-48 catalysts in hydroisomerization of n-dodecane. The effects of the Si/Al ratio and platinum loading on the acid characteristics of Al-MCM-48 and the catalytic performance in n-dodecane hydroisomerization were analyzed. The catalysts were characterized by X-ray diffraction, nitrogen adsorption, infrared spectroscopy of pyridine adsorption, and temperature programmed desorption of ammonia. The number of weak strength acid sites on Al-MCM-48 increased with 0.5 wt/ 0 platinum loading. The weak strength acid sites of Pt/Al-MCM-48 catalysts were ascribed to Lewis acid sites, which can be confirmed by NH3-TPD and FTIR spectra of pyridine adsorption. Iso-dodecane can be produced with high selectivity in n-dodecane hydrosisomerization over Pt/Al-MCM-48 catalysts. This is attributed to the mild acidic properties of Pt/Al-MCM-48 catalysts.

Vowel Compression due to Syllable Number in English and Korean

Yun, Il Sung 한국음성과학회 2002 음성과학 Vol.9 No.4

Strong compression effects in a stressed vowel due to the addition of syllables have been adopted as evidence for stress-timing. In relation to this, Yun (2002) investigated the compression effects of number of syllables on Korean vowel. The results generally revealed that Korean had neither significant nor consistent anticipatory or backwards compression effects, especially when it came to the sentence level. This led us to claim that Korean would not be a stress0timed language. But the language investiga5ted in the study was only Korean, and further cross-linguistic research was needed to confirm the claim. In this study, Yun's (2002) sentence level data are compared with Fowler's (1981) English data. The comparison reveals that Korean seems to be similar to English inthe backwards compression effect, whereas the two languages are markedly different in the anticipatory compression effect. Thus, if English is a stress-timed language and the strong anticipatory compression effect is evidenct in favour of stress-timing as is claimed, the present cross-linguistic study confirms Yun's (2002) suggestion - Korean is unlikely to be stress-timed. On the other hand, compression effcts are revisited: the differences in vowel compression between English and Korean arediscussed from the syntactic and phonological points of view.

Clinical significance of overexpression of NRG1 and its receptors, HER3 and HER4, in gastric cancer patients

Yun, S.,Koh, J.,Nam, S. K.,Park, J. O.,Lee, S. M.,Lee, K.,Lee, K. S.,Ahn, S. H.,Park, D. J.,Kim, H. H. Springer Science + Business Media 2018 Gastric cancer Vol.21 No.2

<P>Conclusions Although our results indicate a lack of prognostic significance of HER3 and HER4 overexpression in GC, overexpression of their ligand, NRG1, was associated with aggressive clinical features and represented an independent unfavorable prognostic factor. Therefore, NRG1 is a potential prognostic and therapeutic biomarker in GC patients.</P>

Ellipsoidal drop impact on a solid surface for rebound suppression

Yun, S.,Lim, G. CAMBRIDGE UNIVERSITY PRESS 2014 Journal of fluid mechanics Vol.752 No.-