慶北地方의 作付體系 確立을 爲한 硏究 : 慶北地方內 地域間 作付體系 現況調査 및 分析 Survey and Analysis on the Present Cropping System among Various Regions

김양춘,徐榮敎,金達雄 慶北大學校 1978 論文集 Vol.25-26 No.-

The objective of this investigation was to obtain the necessary information for the increment of the cultivated land utilization and the establishment of more reasonable multiple cropping system in paddy and upland around Kyungpook Province. For the analysis of the obtained data we used the fixed model employing the arbitrary classification of the regions in sampling. The results of this investigation were summarized as follows: 1. In the acreage per farm household, it was obvious that the farm household in the suburban and truck farming regions has more upland acreage than paddy. On the contrary, there was the exactly reverse trend in the intermediate and fall-behind regions. 2. The old Japonica rice varieties were utilized in the suburban and truck farming regions comparing with the intermediate and fall-behind region using the new Indica-Japonica rice varieties. This tendency in the suburban and truck farming regions was closely associated with the cultivation, especially the harvesting date, of the post-crop after rice. Therefore, it was highly recommandable to develop new high yielding rice variety for the late transplanting in these regions. 3. The rate of the paddy utilization was the highest in the suburban region and was very low in the intermediate and fall-behind region. On the whole regions, the larger paddy owner utilized the lesser in its rate. 4. Barley was cultivated most widely as post-corp after rice in the sampling area. Vegetables in the suburban regions and water melon in Seongju and garlic in the Euiseong were main post-crops in the paddy multiple cropping systems. 5. The rate of the upland utilization was the highest in the suburban regions and was very low in the truck farming region because red pepper and tobacco production region employing only one crop per year. 6. In the double cropping system on the upland, barley and soybean combination was most in the cultivated acreage. The main double cropping system available in the suburban region was fruit vegetables and Chinese cabbage combination. 7. For the increment of the paddy and upland utilization, and of the farm income through the establishment of the reasonable cropping system, it will be desirable to study various possible multiple cropping systems on the experimental basis and the introduction of new crops and varieties may be considered for the incentive of production and return.

와이브로(WiBro) Model frame mapper Hardware 구조 설계

윤창중,임웅철,김진상,조원경,김영수,서덕영 경희-다반 ASIC 설계교육센터 2005 경희-다반 ASIC센터 논문집 Vol.6 No.-

WiBro는 하향 링크와 상향 링크를 시간으로 구분하는 TDD방식이 사용되며 다중접속 방식으로는 OFDMA가 사용된다. WiBro 서비스의 특징들은 frame Mapping 과정에서 잘 나타난다 frame은 하나의 frame당 42개의 symbol 단위로 mapping 되며 TFFT Block에서는 하나의 symbol 단위로 frame mapper에서 Data를 불러와 처리한 후 CP insertion, windowing 과정을 거쳐서 단말에 전송한다. 본 논문에서는 WiBro 서비스를 위하여 TTA에서 제정한 표준안을 토대로 모뎀부분을 VHDL 언어를 이용하여 하드웨어로 설계 하였고 Xilinx Vertex 8000을 Target Device로 이용하였다.

Original Article : Impact of immunosuppressant therapy on early recurrence of hepatocellular carcinoma after liver transplantation

( Ju Yeun Lee ),( Yul Hee Kim ),( Nam Joon Yi ),( Hyang Sook Kim ),( Hye Suk Lee ),( Byung Koo Lee ),( Hye Young Kim ),( Young Rok Choi ),( Geun Hong ),( Kwang Woong Lee ),( Yung Suk Suh4 ) 대한간학회 2014 Clinical and Molecular Hepatology(대한간학회지) Vol.20 No.2

Background/Aims: The most commonly used immunosuppressant therapy after liver transplantation (LT) is a combination of tacrolimus and steroid. Basiliximab induction has recently been introduced; however, the most appropriate immunosuppression for hepatocellular carcinoma (HCC) patients after LT is still debated. Methods: Ninety-three LT recipients with HCC who took tacrolimus and steroids as major immunosuppressants were included. Induction with basiliximab was implemented in 43 patients (46.2%). Mycophenolate mofetil (MMF) was added to reduce the tacrolimus dosage (n=28, 30.1%). The 1-year tacrolimus exposure level was 7.2 ± 1.3 ng/mL (mean ± SD). Results: The 1- and 3-year recurrence rates of HCC were 12.9% and 19.4%, respectively. Tacrolimus exposure, cumulative steroid dosages, and MMF dosages had no impact on HCC recurrence. Induction therapy with basiliximab, high alpha fetoprotein (AFP; >400 ng/mL) and protein induced by vitamin K absence/antagonist-II (PIVKA-II; >100 mAU/mL) levels, and microvascular invasion were significant risk factors for 1-year recurrence (P<0.05). High AFP and PIVKA-II levels, and positive 18fluoro-2-deoxy-d-glucose positron-emission tomography findings were significantly associated with 3-year recurrence (P<0.05). Conclusions: Induction therapy with basiliximab, a strong immunosuppressant, may have a negative impact with respect to early HCC recurrence (i.e., within 1 year) in high-risk patients. (Clin Mol Hepatol 2014;20:192-203)

독성물질의 세포사 기전 및 세포사 유발물질의 검색법 개발에 관한 연구(Ⅱ) : 망간 신경독성을 이용한 파킨슨증 모델의 세포사 Studies on the Mechanism of Parkinsonism induced by Manganese

김종민,박창원,오정자,이보경,서경원,서수경,김규봉,김종원,김광진,김영옥,전범석,박찬웅,이선희 식품의약품안전청 2001 식품의약품안전청 연보 Vol.5 No.-

1960년대 이후 파킨슨병의 유발물질 중 한 후보로서 망간이 주목받으면서 많은 역학적, 병러학적 연구가 수행죄브다. 그러나 망간이 파킨슨병을 직접 일으키는지, 혹은 파킨슨병과 관련된 부위의 신경세포를 파괴시쿡 파킨슨증만을 초래하는 것인지가 아직 정립되지 않은 실정이다 본 연구에서는 실험동물모델에서 행등학적 변화 측정 및 병리학적, 샐화학적 연구를 통하여 망간의 과다노출글 따른 파킨슨병 유발 여부를 확인하고자 하였다. Sprague-Datylet· 렛드에 망간을 1, 2, 5, 10 mgAg/day의 응량으로 30일 등안 복강 투여하였을 때 모든 망간투여군에서 운동성 감소가 관찰되었다. 뇌조직의 망간 함량을 ion chromatograph?로 측정한 결과 중뇌 흑질과 기저핵 선조체에서 망간 함량의 뚜렷한 증가 소견이 관찰되었으며, 니슬염색체서 선조체의 신경세포수의 유의성 있는 감소가 관찰되었다. 그러나, 흑질의 TH효소 면역염색, GFAP 면역염색, 흑질과 선조체의 T릿효소 western blot 결과는 대조군과 차이가 없었다. 이상의 결과에서, 망간-파킨슨증 모델에서 파킨슨증어 유발되는 기전은 흑질 도파민성 신경 세포의 신호를 받는 선조체 씬경세포의 사멸에 의한 것으로 생각된다. 결론적으로, 망간 독성에 의한 파킨스증 모델에서는 파킨슨 병과는 달리 흑질 도파민성 신경세포의 세포사는 관여하지 않는 것으로 관찰되었다. Manganese(Mn) intoxication causes a parkinsonian syndrome. It may be difficult to distinguish Mn-induced parkinsonism from idiopathic Parkinson disease(IPD). Neuropathological descriptions on the brains with Mn intoxication showed the perferential damage in the globus pallidus and substantia nigra pars reticularis. Pathological reports on the substantia nigra pars compacta(SNpc), a mafor focus of pathologic changes in IPD, are discordant and controversial. The SNpc involvement is of critical importance for the elucidation of pathogenesis of IPD. Therefore, the neurodegeneration in SNpc was investigated in the experimental model of Mn neurotoxicity. Sprague-Dawley rats were administered with manganese chloride(1, 2, 5, 10 mg/kg/day, i.p.) for 30 days. Treated animals showed low levels of distance-traveled from locomotor activity tests. Ion chromatography revealed that Mn accumulation was significant in SN and basal ganglia in Mn-treated animals. Nissl staining showed neuronal loss of the striatum in all treated animals. The degree of neurodegeneration in SN was determined by immunohistochemical staining of tyrosine hydroxylase(TH). The numbers of TH-positive cells on nigral sections were not different from each groups(P>0.05). The densities of glial fibrillary acidic protein immunoreactivity from SN were similar between groups. TH-westen blotting showed no differences between treated animals and controls. In conclusion, the SNpc remains intact in Mn intoxication, and Mn-induced parkinsonism may be caused by damages of output pathways downstream to the nigrostriatal dopminergic system.

Alcohol, NAFLD, Other : The Uneven Distribution of Liver Fat Estimated from MRI and its Clinical Importance

( Young Rok Choi ),( Tae Yoo ),( Suk Won Suh ),( Jeong Moo Lee ),( Hye Young Kim ),( Hae Won Lee ),( Nam Joon Yi ),( Kwang Woong Lee ),( Kyung Suk Suh ) 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1

Background: This study was aimed to evaluate the discrepancy between hepatic fat fraction based on MR chemical shifting images (MRC) and hepatic fatty change of the frozen section as well as the regional difference of hepatic fat and its clinical importance using MRC. Patients and Methods: Between Feb. 2010 and Jun. 2012, 278 living donor liver transplantations were performed at Seoul National University Hospital. 29 living liver donors who had fatty liver (macro-vesicular fatty change > 5%) were retrospectively reviewed. Fat fraction was estimated in the different 13 regions of the liver (segment 1, 2, 3 and the peripheral & deep portion of segment 4, 5, 6, 7, 8) on MRC images. And the pathologic report for frozen section of their liver biopsy was investigated. Results: The degree of discrepancy between liver frozen biopsy and fat fraction from MRC was increased corresponding to the level of fatty change on biopsy. And the degree of regional difference in the hepatic fat also depends on the amount of fat content. The difference of fat fraction went up to 10.6% in this study. And the highest fatty region of 25 donors (86.71%) was located in the right liver right liver and the lowest fatty region of 17 donors (58.62%) was in left liver. Conclusion: Because a needle or wedge biopsy cannot represent the remaining liver completely, especially in a fatty liver, MRC will be helpful to realize the accurate amount of hepatic fat and its regional distribution.

Synthesis of Stable Mesostructured Zirconia : Tween Surfactant and Controlled Template Removal

Suh, Young-Woong,Rhee, Hyun-Ku 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.1

Mesostructured zirconia has been synthesized by using zirconium chloride and PED nonionic ethoxylated sorbitan ester(Tween-20, -40, -60 or -80) as a zirconium source and structure-directing agent in an aqueous medium. To remove the occluded surfactants, UV/ozone treatment has been utilized instead of calcination due to thermal instability. This results from a special molecular structure of Tween surfactant. From XRD, SEM and TEM analyses, the materials treated with UV light and in-situ generated ozone has a wormhole structure and ill-defined or well-defined spherical particles.

Optimum Washing Conditions for the Preparation of Cu/ZnO/ZrO_2, for Methanol Synthesis from CO Hydrogenation : Effects of Residual Sodium

Suh, Young-Woong,Rhee, Hyun-Ku 한국화학공학회 2002 Korean Journal of Chemical Engineering Vol.19 No.1

The residual sodium in the Cu/ZnO/ZrO_2 catalyst is found to inhibit the interaction between CuO and ZnO and lead to a decrease in the catalytic activity for CO hydrogenation. Therefore, it is required to reduce the content of sodium as much as possible during the course of catalyst preparation. To obtain 10% yield of methanol, the sodium content must be reduced to a level lower than 0.15%. For this purpose, the washing condition has been investigated experimentally to optimize the preparation conditions of Cu/ZnO/ZrO_2 catalyst. As a result, the sodium content could be reduced to 0.115% by washing the cake four times with 50mL of distilled water per gram of the cake, which constitutes the optimum condition for washing.

Effect of reduction temperature on the preparation of zero-valent iron aerogels for trichloroethylene dechlorination

Young-Woong Suh,Jihye Ryu,서동진,Young-Kwon Park 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.6

Zero-valent iron (ZVI) aerogels have been synthesized by sol-gel method and supercritical CO2 drying, followed by H2 reduction in the temperature range of 350-500 oC. When applied to trichloroethylene (TCE) dechlorination, the ZVI aerogel reduced at 370 oC showed the highest performance in the conditions employed in this study. Thus, the effect of reduction temperature in preparing ZVI aerogels has been investigated by several characterizations such as BET, XRD, TPR, and TEM analyses. As the reduction temperature decreased from 500 to 350 oC, the BET surface area of the resulting aerogels increased from 6 to 30 m2/g, whereas their Fe0 content decreased up to 64%. It was also found that H2 reduction at low temperatures such as 350 and 370 oC leads to the formation of ZVI aerogel particles consisting of both Fe0 and FeOx in the particle cores with a different amount ratio, where FeOx is a mixture of maghemite and magnetite. It is, therefore, suggested that reduction at 370 oC for ZVI aerogel preparation yielded particles homogeneously composed of Fe0 and FeOx in the amount ratio of 87/13, resulting in high TCE dechlorination rate. On the other hand, when Pd- and Ni-ZVI aerogels were prepared via cogellation and then applied for TCE dechlorination, we also observed a similar effect of reduction temperature. However, the reduction at 350 or 370 oC produced Pd- or Ni-ZVI aerogel particles in which Fe0 and Fe3O4 co-exist homogeneously. Since both Fe0 and Fe3O4 are advantageous in TCE dechlorination, the activities of Pd- and Ni-ZVI aerogels reduced at 350 oC were comparable to those of both aerogels reduced at 370 oC, although the former aerogels have less Fe0 content.

Recent Trends on Ionic Liquid-Aided Cellulose Dissolution and Pretreatment

Young-Woong SUH 한국생물공학회 2014 한국생물공학회 학술대회 Vol.2014 No.4

Application of Stochastic Search Variable Selection to Genetic Association Studies in Common Complex Diseases

Young Ju Suh,Ki Woong Kim,Jin Hyeong Jhoo,Dong Young Lee,Jong Chul Youn,Yong Soo Paek,Il Han Choo,Jung Hie Lee,Jong Inn Woo 한국유전학회 2006 Genes & Genomics Vol.28 No.3