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[논문]지진격리교량의 내진설계를 위한 표준 인공지진파 생성
김남식,김재민,이계희,강형택 釜山大學校生産技術硏究所 2007 生産技術硏究所論文集 Vol.66 No.-
본 연구에서는 지진격리교량의 내진설계에 사용할 수 있는 인공지진파의 생성기법을 제시하였다. 또한,생성한 지진파가 적절한지 조사하였으며,지진격리교량의 내진설계기준(안)을 토대로 인공지진파 작성을 수행하였다. 설계지반응답스펙트럼을 만족시키기 위하여 22개의 가속도시간이력을 작성하였다. 얻어진 인공지진파는 (1) 통제진동수에서 인공지진파의 평균응답스펙트럼 평가, (2) EPGA(유효최대지반가속도) 평가,(3) 인공지반가속도 사이의 상관계수 평가, 동으로 적합성을 평가하였다. 최종적으로 생성된 인공지진파를 이용하여 4쌍의 지진파를 사용한 최대응답과 7쌍의 지진파를 사용한 평균 응답을 계산하여 제안된 인공지진파 시간이력의 타당성을 제시하였다.
Bohart - Adams 식을 이용한 폐굴껍질 충진탑의 설계
김석택,김형석,김은호,김일배 한국환경농학회 1999 한국환경농학회지 Vol.18 No.3
본 연구에서는 폐굴껍질의 중화능을 파악하고 Bohart-Adams 식에 의하여 현장에서의 폐굴껍질 충진탑 설계시 필요한 인자를 도출하여 폐굴껍질의 재활용 가능성을 검토해본 결과, 다음과 같은 결론을 얻을 수 있었다. 1. 실험초기에는 pH2.2의 폐수가 유입되어 pH6.3 이상의 높은 중화능을 나타냈으며, 표면적 부하율이 가장 낮은 실험 1에서 가장 길게 pH6.0이상을 유지하였다. 2. 각 중금속의 흡착증력(No)을 비교하면 Fe의 경우는 가장 높은 데 비해 표면적 부하율에 따른 영향을 많이 받는 반면에 Cu는 흡착능력이 가장 낮게 나타났지만 표면적 부하율 변동에 큰 영향을 받지 않았다. 3. 사용시간은 Cr$gt;Fe$gt;Cu 순으로 Cr이 훨씬 길었지만, 제거된 량과 흡착효율의 경우에 Fe$gt;Cr$gt;Cu의 순으로 Fe이 더 높음을 알 수 있었다. 본 연구는 단순 물리흡착 이론식인 Bohart-Adams 식으로만 설명하기는 다소 무리는 있으나 폐굴껍질에 의한 도금폐수와 같은 산성이며 중금속을 함유한 폐수처리시 막대한 비용의 절감과 더불어 폐자원의 재활용 측면에서 아주 효과적일 것으로 기대된다. Objective of the research is to estimate neutralization capacity and to determine practical running parameters required in packing tower design of waste oyster shells using Bohart-Adams equation. It is expected that waste ouster shells are able to be recycled for removal of heavy metals through neutralization of plating wastewater because those contain approximate 93% CaCO₃. By applying the results of the continuous experiment to Bohart-Adams equation, service time decreases in the order of Cr$gt;Fe$gt;Cu, while removal efficiencies of metals become less in the order of Fe$gt;Cr$gt;Cu.
김오영,김미경,김주호,성범용,오현택,손현이,이광웅,김형권,윤해성,공규돈,신용민 대한간학회 1998 Clinical and Molecular Hepatology(대한간학회지) Vol.4 No.2
Benign recurrent intrahepatic cholestasis (BRIC) is a rare desease, which usually manifests between the age of 10 and 20. Its main clinical feature is multiple recurrent episodes of cholestasis without extrahepatic bile duct obstruction. We report here a case of nonfamilial benign recurrent intrahepatic cholestasis. The patient has experienced recurrent jaundice with pruritus since childhood. Main bile duct obstrution was excluded by abdominal CT and endoscopic retrograde cholangiopancreatography. Other causes of cholestasis were not found. Hepatic histology revealed bile plug which were mainly concentrated in the centrilobular region, and increased number of mononuclear cells in the portal triad, but hepatic parenchyma showed no inflammation and necrosis. In the last anicteric period, she was healthy and the liver function test and biopsy specimen were normal. (Korean J Hepatol 1998;4:188 - 193)
Kim, Hyeong-Seok,Hong, Jae-Taek,Lee, Sang-Won,Son, Byung-Chul,Sung, Jae-Hoon,Kim, Moon-Chan The Korean Neurosurgical Society 2005 Journal of Korean neurosurgical society Vol.38 No.1
Objective : The aim of this study is to assess the significance of an apparent diffusion coefficient[ADC] study for diagnosis of ventriculitis. Methods : Seven patients with ventriculitis were enrolled in this study. Diffusion-weighted[DW] magnetic resonance images[MRI] and ADC maps in the dependent intraventricular collection, periventricular white matter and non-dependent cerebrospinal fluid[CSF] were obtained. The images and ADC data from the different lesions were compared. Results : The DW MRI showed marked hyperintensity in the purulent pus lesion, and the corresponding ADC maps revealed prominent hypointensity and restricted ADC values compared with the non-dependent CSF and normal white matter. Conclusion : The decreased ADC value and increased signal intensity of the dependent intraventricular fluid on the DW MRI show restricted water diffusion in the purulent fluid, which is indicative of a pyogenic ventriculitis diagnosis.
Kim, Hyeong Jun,Kim, Jae-Han,Ryu, Ji-Ho,Kim, Youngkwon,Kang, Hyunbum,Lee, Won Bo,Kim, Taek-Soo,Kim, Bumjoon J. American Chemical Society 2014 ACS NANO Vol.8 No.10
<P>While most high-efficiency polymer solar cells (PSCs) are made of bulk heterojunction (BHJ) blends of conjugated polymers and fullerene derivatives, they have a significant morphological instability issue against mechanical and thermal stress. Herein, we developed an architecturally engineered compatibilizer, poly(3-hexylthiophene)-<I>graft</I>-poly(2-vinylpyridine) (P3HT-<I>g</I>-P2VP), that effectively modifies the sharp interface of a BHJ layer composed of a P3HT donor and various fullerene acceptors, resulting in a dramatic enhancement of mechanical and thermal stabilities. We directly measured the mechanical properties of active layer thin films without a supporting substrate by floating a thin film on water, and the enhancement of mechanical stability without loss of the electronic functions of PSCs was successfully demonstrated. Supramolecular interactions between the P2VP of the P3HT-<I>g</I>-P2VP polymers and the fullerenes generated their universal use as compatibilizers regardless of the type of fullerene acceptors, including mono- and bis-adduct fullerenes, while maintaining their high device efficiency. Most importantly, the P3HT-<I>g</I>-P2VP copolymer had better compatibilizing efficiency than linear type P3HT-<I>b</I>-P2VP with much enhanced mechanical and thermal stabilities. The graft architecture promotes preferential segregation at the interface, resulting in broader interfacial width and lower interfacial tension as supported by molecular dynamics simulations.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-10/nn503823z/production/images/medium/nn-2014-03823z_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn503823z'>ACS Electronic Supporting Info</A></P>
Kim, Dong-Hyeon,Jeong, Dana,Oh, Yong-Taek,Kim, Hong-Seok,Kim, Yun-Gyeong,Song, Kwang-Young,Kang, Il-Byung,Kim, Young-Ji,Park, Jin-Hyeong,Chang, Ho-Seok,Lim, Hyon-Woo,Chon, Jung-Whan,Kim, Hyunsook,Jeon Korean Society of Dairy Science and Biotechnology 2017 한국유가공기술과학회지 Vol.35 No.1
Made using a natural mixed starter of lactic acid bacteria and yeast, Koumiss is a slightly alcoholic fermented mare's milk beverage, and a traditional drink of the nomadic populations of Central Asia. Cichorium intybus L. (chicory) is a sedative with potential cardioactive properties, and its oligosaccharides are beneficial in maintaining healthy gastrointestinal flora. Hence, in this study, we have generated a functional Koumiss containing two different concentrations of chicory. After fermentation of the Koumiss premix, the TA increased to 0.85~0.88%, and the pH decreased to ~4.3. The addition of either concentration of chicory had no significant effect on pH and TA. However, the taste, flavor, color, texture, and overall acceptability decreased in proportion to the added amount of chicory. This study has provided the first data on Koumiss supplemented with chicory. The results could be useful in developing high-quality Koumiss with functional activity using chicory, and allowing large-scale industrial production. Further studies are needed to determine if chicory root extract is beneficial for lifestyle-related diseases.
Kim, Hyeong Jun,Lee, Moo Yeol,Kim, Jin-Seong,Kim, Jae-Han,Yu, Hojeong,Yun, Hongseok,Liao, Kin,Kim, Taek-Soo,Oh, Joon Hak,Kim, Bumjoon J. American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.16
<P>Considering all the potential applications of organic electronics in portable, wearable, and implantable devices, it is of great importance to develop electroactive materials that possess mechanical reliability along with excellent electronic performance. The coexistence of these two attributes, however, is very difficult to achieve because there is an inverse relationship between the electrical properties and the mechanical flexibility, both of which are associated with the conjugation length and intermolecular ordering of the polymers. Herein, we demonstrate a simple and robust approach based on solution assembly of two different poly(3-hexylthiophene)s (P3HTs) with regioregularity (RR) contents of 97% and 66% to impart both electrical and mechanical properties to films for organic electronic applications. The 97% RR P3HT exhibits high electronic performance but poor mechanical resilience, and vice versa for the 66% RR P3HT. Selective crystallization of high RR P3HT induced by solution assembly allows the use of a one-step process to construct percolated networks of high RR P3HT nanowires (NWs) in a low RR P3HT matrix. Only S wt % of high RR P3HT NWs in a 95 wt % low RR PRIT matrix was required to produce hole mobilities comparable to that of pure high RR P3HT, and this blend film exhibited improvements by factors of 20 and 60 in elongation at break and toughness, respectively. Selective self-assembly of RR-controlled polymers allowed us to overcome the fragile nature of highly crystalline conjugated polymer films without sacrificing their electronic properties.</P>