• Title/Summary/Keyword: Lee Ji-Ham

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Analysis and Localization of freeWAIS-sf (FreeWAIS-sf의 분석 및 한글화)

  • O, Jeong-Seok;Kim, Ji-Seung;Lee, Jun-Ho;Lee, Sang-Ho
    • Journal of KIISE:Computing Practices and Letters
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    • v.5 no.5
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    • pp.611-618
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    • 1999
  • An efficient and effective access to needed information becomes an important factor in the modern information society. Many people have developed information retrieval (IR) systems that retrieve needed information from a large amount of data at a given time. However, most freely available IR systems have been developed for English text rather than for Korean text. In this research, we have analyzed the IR system freeWAIS-sf, and localized it with the Korean morphological analyzer, namely HAM. The localized freeWAIS-sf can handle both English text and Korean text simultaneously. We have also modified the weighting scheme of freeWAIS-sf. The experimental result shows that the modified weighting scheme outperforms the original one in terms of retrieval effectiveness.

Hepatogenic Potential of Umbilical Cord Derived-Stem Cells and Human Amnion Derived-Stem Cells (사람의 제대 및 양막유래 줄기세포의 간세포로의 분화)

  • Kim, Ji-Young;Lee, Yoon-Jung;Park, Se-Ah;Kang, Hyun-Mi;Kim, Kyung-Sik;Cho, Dong-Jae;Kim, Hae-Kwon
    • Clinical and Experimental Reproductive Medicine
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    • v.35 no.4
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    • pp.247-265
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    • 2008
  • Objectives: Many types of liver diseases can damage regenerative potential of mature hepatocytes, hepatic progenitor cells or oval cells. In such cases, a stem cell-based therapy can be an alternative therapeutic option. We examined whether human amnion-derived mesenchymal stem cells (HAM) and human umbilical cord-derived stem cells (HUC) could differentiate into hepatocyte-like cells as therapeutic cells for the liver diseases. Methods: HAM and HUC were isolated from the amnion and umbilical cord of the volunteers after a caesarean section with informed consent. In order to differentiate these cells into hepatocyte-like cells, cells were cultivated in hepatogenic medium using culture plates coated with fibronectin. Effects of hepatocyte growth factor, L-ascorbic acid 2-phosphate, insulin premixture fibroblast growth gactor 4, dimethylsulfoxide, oncostatin M and/or dexamethasone were examined on the hepatic differentiation. After differentiation, the cells were analyzed by RT-PCR, immunocytochemistry, immunoblotting, albumin ELISA, urea assay and periodic acid-schiffs staining. Results: Initial fibroblast-like appearance of HAM and HUC changed to a round shape during culture in the hepatogenic medium. However, in all hepatogenic conditions examined, HUC secreted more amounts of albumin or urea into medium than HAM. Expression of some of hepatocyte-specific genes increased and expression of new genes were observed in HUC following cultivation in hepatogenic medium. Results of immunocytochemistry and immunoblotting analyses demonstrated that HUC secreted albumin into the culture medium. PAS staining further demonstrated that HUC could store glycogen inside of the cells. Conclusions: Both HUC and HAM could differentiate into albumin-secreting, hepatocyte-like cells. Under the same hepatogenic conditions examined, HUC more efficiently differentiated into hepatocyte-like cells compared with the HAM. The results suggest that HUC and HAM could be used as sources of stem cells for the cell-based therapeutics such as in liver diseases.

The study of the exact determination of power factor (정확한 회로 역률 산출 방법에 대한 연구)

  • Yun, Ji-Ho;Park, Ji-Hun;Ham, Gil-Ho;Lee, Sung-Man
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1149-1151
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    • 1999
  • 현재까지 회로 역률을 정확히 계산할 수 있는 방법은 없다. 그러나, 표준을 목적으로 규격마다 서로 다른 계산 방법을 명시하고 있다. 실제로 실험을 통해, 시험 조건이나 시험 결과에 따라 적합한 계산 방법을 적용함으로써 보다 정확한 역률을 계산할 수 있음을 알 수 있었다. 그러나, 이러한 각종 역률 계산 방법들이 역률 크기나 전류 투입각에 대하여 얼마 만큼의 오차를 가지는지 알려져 있지 않기 때문에 적합한 방법을 결정하기란 쉬운 일이 아니다. 따라서, 본 논문에서는 각종 규격에 명시되어 있는 역률 계산 방법들을 구현하여 전류 투입각과 역률 크기에 대한 상대적 계산 오차를 구하고, 문제점과 보완법을 제시하며, 시험 조건에 따른 계산법을 제시하고 이를 실험을 통해서 입증하고자 한다.

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Inactivation of Campylobacter jejuni using Radio-frequency Atmospheric Pressure Plasma on Agar Plates and Chicken Hams

  • Kim, Joo-Sung;Lee, Eun-Jung;Cho, Eun-Ah;Kim, Yun-Ji
    • Food Science of Animal Resources
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    • v.33 no.3
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    • pp.317-324
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    • 2013
  • Radio-frequency driven atmospheric pressure plasma using argon gas was studied in the inactivation of Campylobacter jejuni in order to investigate its applicability. First, the inactivation study was conducted on an agar surface. C. jejuni NCTC11168 was reduced by more than 7 Log CFU after an 88 s treatment. Another strain, ATCC49943, was studied; however, the inactivation was less efficient, with a 5 Log CFU reduction after a 2 min treatment. Then, chicken breast ham was studied at the $10^6$ CFU inoculation level. The inactivation efficiency was much lower for both strains compared to that on the agar plates. C. jejuni NCTC11168 and ATCC49943 were reduced by 3 Log CFU after a 6 min treatment and by 1.5 Log CFU after a 10 min treatment, respectively. The scanning electron microscopy analysis indicated that C. jejuni cells were deformed or transformed into coccoid form under the plasma treatment. During the plasma treatment, the temperature of the samples did not rise above $43^{\circ}C$, suggesting that heat did not contribute to the inactivation. Meanwhile, water activity significantly decreased after a 10 min treatment (p<0.05). This study conveyed that radio-frequency atmospheric pressure plasma can effectively inactivate C. jejuni with strain-specific variation.

The Interaction Effect of Foreign Model Attractiveness and Foreign Language Usage (외국인 모델의 매력도와 외국어 사용의 상호작용 효과)

  • Lee, Ji-Hyun;Lee, Dong-Il
    • Journal of Global Scholars of Marketing Science
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    • v.17 no.3
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    • pp.61-81
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    • 2007
  • Recently, use of foreign models and foreign language in advertising is a general trend in Korea even though the effect has not been well-known..Most of the previous research shows rather an opposite effect claiming marketing communication is more effective when higher congruity between marketing communication and consumer's cultural values are achieved. However, the introduction of global culture due to the expansion of new media such as Internet or cable television makes the congruity not the best choice of marketing strategy. In addition, use of highly attractive models in advertising to increase the effect of advertising is general. However, recent studies show that targeted women audience tend to compare themselves to the highly attractive models and do experience negative sentiment. Bower (2001) proved the difference between 'comparer' and 'noncomparer' when women face highly attractive models. The results show that a comparer who has an intention to compare highly attractive model (HAM) with herself has a significantly negative effect on model expertise, product argument, product evaluation and buying intention. Therefore, HAM is not always a good choice and model attractiveness plays a role in the processing other cues or changing the advertising effect from result of processing other cues. The purpose of this study is to investigate the effect of the use of foreign language on the advertising response of the audience with regard of the model attractiveness. For the empirical study, the virtual advertising using foreign models (HAM, NAM), brand names and slogans(Korean, English) were used as stimuli. The respondents of each stimulus were 75('HAM-Korean'), 75('NAM-Korean'), 66('HAM-English') and 66 ('NAM-English') respectively. To establish the effect of marketing communication, the attitude for media(AM), the attitude for product(AP), targetedness(TD), overall quality(OQ), and purchase intention(PI) with 7 point likert scale were measured. The manipulation was verified to check the difference between HAM attractiveness assessment (m=3.27) and NAM attractiveness assessment (m=5.12). The mean difference was statiscally significant (p<.05). As a result, all consequences were significantly changed with model attractiveness, and overall quality evaluation(OQ) were significantly changed with language. The interaction effect from model attractiveness and language was significant on attitude toward the product(AP) and purchase intention(PI). To analyze the difference, the mean values and standard deviation of consequences were compared. The result was more positive when model attractiveness was high for all consequences. For language effect, the assessment was more positive when English was used for OQ. Considering model attractiveness and language simultaneously, HAM-Korean was more positive for AP and PI, and NAM-English was more positive for AP and PI. In other words, the interaction effect was confirmed by model attractiveness and language. As mentioned above, use of foreign models and foreign language in advertising was explained by cultural match up hypothesis (Leclerc et al. 1994) which claimed that culture of origin effect. In other words, in advertising, use of same cultural language with the foreign model could make positive assessment for OQ. But this effect was moderated by model attractiveness. When the model attractiveness was low, the use of English makes PI high because of the effect of foreign language which supported the cultural match up hypothesis. When the model attractiveness was low, the use of Korean made AP and PI high because the effect of foreign language was diluted. It was a general notion that the visual cues got processed before (Holbrook and Moore, 1981; Sholl et al, 1995) compared to linguistic cues. Therefore, when consumers were faced HAM, so much perception was already consumed at processing visual cues making their native language of Korean to strongly and positively connected with the advertising concept. On the contrary, when consumers were faced with NAM, less perception was consumed compared to HAM, making English to accompany cultural halo effect which affected more positively. Therefore, when foreign models were employed in advertising, the language must be carefully selected according to the level of model attractiveness.

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Design and fabrication for large current capacity of high temperature superconducting transformer (대전류용 고온초전도 변압기의 설계 및 제작)

  • Kim, Yung-Il;Lee, Se-Yeon;Park, Sang-Ho;Ham, Il-Kyu;Lee, Ji-Kwang;Hahn, Song-Yop;Choi, Kyeong-Dal
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.892-893
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    • 2011
  • 본 논문은 2세대 고온 초전도 선재를 이용한 대전류용 고온초전도 변압기의 설계 및 제작에 관한 연구결과이다. 대전류용 변압기는 154 kV, 단상 33 MVA를 기준으로 기 설계된 초전도 변압기의 요소기술 평가를 위한 것으로 초전도 변압기의 제작의 중요 요소기술 중 하나인 저압권선용 초전도 선재의 대전류 통전 특성평가와 초전도 권선의 교류손실 저감효과에 관한 검증을 위해 설계 및 제작 되었다. 이러한 대전류용 변압기의 설계와 초전도 권선의 제작, 시험을 통해 실제 100 MVA 초전도 변압기 설계의 신뢰성과 대전류 통전용 초전도 선재의 성능평가를 확인하였다.

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Comparison of the Bupropion versus Aripiprazole Adjunctive Therapy for the Treatment of Female Depression : Post-Hoc Analyses from a Randomized Prospective Open-Label Multi-Center Study (여성 우울증 환자에서 Aripiprazole과 Bupropion 부가요법의 우울증상 및 안전성에 대한 효과 비교 : 사후분석연구)

  • Keum, Mu-sung;Cheon, Eun-Jin;Lee, Kwang-Hun;Koo, Bon-Hoon;Lee, Young-Ji;Park, Young-Woo;Lee, Jong-hun;Lee, Seung-Jae;Sung, Hyung-Mo
    • Mood & Emotion
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    • v.16 no.3
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    • pp.140-151
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    • 2018
  • Objectives : The purpose of this study was to examine effects of adjunctive aripiprazole versus bupropion, on depressive symptoms of female depression. Methods : Sixty six female patients with major depressive disorders were enrolled from a six-week, randomized prospective open-label multi-center study. Participants were randomized to receive aripiprazole (2.5-10 mg/day) or bupropion (150-300 mg/day). Montgomery Asberg Depression Rating Scale, 17-item Hamilton Depression Rating scale (HAM-D17), Iowa Fatigue Scale, Drug-Induced Extrapyramidal Symptoms Scale, Psychotropic-Related Sexual Dysfunction Questionnaire scores, and Clinical Global Impression-Severity (CGI-S) were obtained at baseline and after one, two, four, and six weeks. Changes on individual items of HAM-D17 were assessed as well as on composite scales (anxiety, insomnia and drive), and on four core subscales that capture core depression symptoms. Results : Overall, both treatments improved depressive symptoms, without causing serious adverse events. There were significant differences in the HAM-D17 total score (p=0.046) and CGI-S (p=0.004), between aripiprazole and bupropion augmentation, favoring aripiprazole over bupropion. Aripiprazole revealed significantly greater effect size in depressed mood (p=0.006), retardation (p=0.005), anxiety psychic (p=0.032), and general somatic symptom (p=0.01). Conclusion : While both treatments were effective, results of this study suggested that aripiprazole may be preferable, in treating general and core symptoms of female depression.

A Study on the Operation Mechanism of Celestial Movement Apparatus of ChoiYuJi's Armillary Sphere(渾天儀)

  • Ham, Seon Young;Kim, Sang Hyuk;Lee, Yong Sam
    • The Bulletin of The Korean Astronomical Society
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    • v.40 no.1
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    • pp.86.2-86.2
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    • 2015
  • 17세기 최유지가 제작한 혼천의는 수격식 동력으로 움직이는 자동 천문시계이다. 이 혼천의는 수격식 동력장치와 시간을 알려주는 시보장치, 태양과 달의 운행을 나타내는 천체운행장치로 구성되어 있다. 이 연구는 최유지 혼천의의 천체운행장치의 작동 메카니즘에 대한 것이다. 최유지 혼천의의 천체운행장치는 태양의 연주운동과 일주운동을 재현하는 태양운행장치와 달의 공전운동과 위상변화를 재현하는 달운행장치로 구성되어 있다. 이 장치들은 조선 초기의 수격식 천문시계에 설치되었던 천체운행장치보다는 발전된 양상을 보인다. 조선 초기에 실로 매어서 운행하던 태양운행장치는 차전(叉箭)과 경각(梗角), 소축(小軸)이라는 장치들이 혼천의에 추가로 설치되어 실과 함께 태양장치를 운행하였다. 또한 조선 초기에는 설치되지 않았던 달운행장치가 새롭게 설치되어 방각(方角), 차전(叉箭), 백각환에 13도 간격으로 박힌 대나무못과 실을 활용하여 달장치를 운행하게 하였다. 우리는 최유지 혼천의의 천체 운행장치 작동 메카니즘에 대하여 분석하고 개념모델을 제시했다.

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An Archaeochemical Microstructural Study on Koryo Inlaid Celadon

  • Ham, Seung-Wook;Shim, Il-wun;Lee, Young-Eun;Kang, Ji-Yoon;Koh, Kyong-Shin
    • Bulletin of the Korean Chemical Society
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    • v.23 no.11
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    • pp.1531-1540
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    • 2002
  • With the invention of the inlaying technique for celadon in the latter half of the 12th century, the Koryo potters reached a new height of artistic and scientific achievement in ceramics chemical technology. Inlaid celadon shards, collected in 1991 during the surface investigation of Kangjin kilns found on the southwestern shore of South Korea, were imbedded in epoxy resin and polished for cross-section examination. Backscattered electron images were taken with an electron microprobe equipped with an energy dispersive spectrometer. The spectrometer was also used to determine the composition of micro-areas. Porcelain stone, weathered rock of quartz, mica, and feldspar composition were found to be the raw material for the body and important components in the glaze and white inlay. The close similarity between glaze and black inlay in the microstructure suggests that the glaze material was modified by adding clay with high iron content, such as biotite, for use as black inlay. The deep soft translucent quality of celadon glaze is brought about by its microstructure of bubbles, remnant and devitrified minerals, and the schlieren effect.