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Ham, Ju-Yeon,Lee, Jung-Hoon,Woo, Hyeok-Jun The Korea Contents Association 2010 International Journal of Contents Vol.6 No.4
In recent years, many leading corporations are actively adopting IT as competitive resources to improve productivity and processes efficiency with strategic alignments. In effect, IT investment also continues to increase. As a vast growth of IT investment, questions and criticism on recent IT investment results are also rapidly being raised. Especially, improper decision making and management on IT investment may cause negative impact on the company's reputation and finances, therefore companies need reasonable and wise investment decision making on new IT projects. This study applies the conceptual framework of IT governance to IT investment decision making cases to examine how IT investment governance influences the quality of IT investment decision making and how business-IT strategic alignment affects the quality of IT investment decision making. This paper contributes to identify the main factors for reasonable and effective IT investment decision making and expected to provide proper guidelines for IT investment decision making.
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Ju-Yeon Ham,Jung-Hoon Lee,Hyeok-Jun Woo 한국콘텐츠학회(IJOC) 2010 International Journal of Contents Vol.6 No.4
In recent years, many leading corporations are actively adopting IT as competitive resources to improve productivity and processes efficiency with strategic alignments. In effect, IT investment also continues to increase. As a vast growth of IT investment, questions and criticism on recent IT investment results are also rapidly being raised. Especially, improper decision making and management on IT investment may cause negative impact on the company’s reputation and finances, therefore companies need reasonable and wise investment decision making on new IT projects. This study applies the conceptual framework of IT governance to IT investment decision making cases to examine how IT investment governance influences the quality of IT investment decision making and how business-IT strategic alignment affects the quality of IT investment decision making. This paper contributes to identify the main factors for reasonable and effective IT investment decision making and expected to provide proper guidelines for IT investment decision making.
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Ham, Sang-Hwan,Cho, Su-Yeon,Kang, Dong-Woo,Lee, Hyung-Woo,Chan, Hong-Soon,Lee, Ju The Korean Society for Railway 2010 International Journal of Railway Vol.3 No.1
This paper describes design and characteristic analysis of long primary type linear synchronous motor (LSM) for high speed train system. LSM is designed using loading distribution method and magnetic equivalent circuit. For characteristic analysis of LSM, analytical and numerical methods are applied. Analytical method for solving the magnetic field distribution of the analytic model is based on the Maxwell’s equations. Using the characteristic equation and magnetic equivalent circuit, we analyze the effect of variation of parameters, and then we validate the result by comparing with numerical method by finite element method (FEM). We compare the analytical method with numerical method for analyzing the effect by variable parameters. This result will be useful of design and forecast of performance without FEM.
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청년 1인가구 여가인식탐색 : 네트워크기반 의미연결망분석의 적용
함연주(Ham, Yeun-Ju),원영신(Won, Young-Shin),김수연(Kim Sue-Yeon) 한국스포츠사회학회 2021 한국스포츠사회학회지 Vol.34 No.3
본 연구는 네트워크 기반 의미연결망 분석을 적용해 우리나라 청년 1인가구의 여가인식을 탐색하고 여가지원정책 연구에 실증적 기초자료를 제공하는 데 목적이 있다. 이를 위해 ‘청년 1인가구’가 가지는 여가에 대한 태도, 생각 및 의견을 통해 여가인식을 탐색하여 이들이 가지고 있는 여가인식 특징에 대해 알아보았다. 연구대상은 서울 소재 20-34세 1인가구이다. 연구대상은 비확률 표집방법 중 유의표본추출법을 사용하였으며 자기평가기입법(self-administrated method)으로 설문에 응하도록 하였다. 본 연구의 자료 처리는 설문을 통해 수집 된 201개의 질적 데이터를 바탕으로 단어정제 및 주요단어를 선정하고 KrKwic를 이용하여 주요단어의 공출현빈도를 산출한 뒤 KrTitle을 이용하여 행렬을 산출하였다. 이때 산출 된 전체문장은 1206개였으며 추출된 전체 단어의 수는 1945개였고 독립된 단어의 개수는 189개였다. 그 후 UCINET6를 이용해 중앙성 값을 산출하고 Netdraw프로그램을 이용하여 네트워크를 시각화하였으며, CONCOR분석을 통해 군집화 하였다. 연구결과 청년 1인가구의 여가인식은 ‘시간<SUP>*</SUP>’, ‘금전적<SUP>*</SUP>’, ‘일상’, ‘스트레스해소’, ‘부담<SUP>*</SUP>’의 단어를 기반으로 관계와 연결강도를 형성하고 있었다. 청년 1인가구는 여가를 시간적 또는 활동적 정의로 받아들이고 있었으며 여가의 전반적 이미지 및 기능에 대해서는 긍정적 인식을 보였으나 여가 참여조건과 관련된 부분에서는 부정적 인식을 보였다. 또한 청년 1인가구는 여가를 노동을 위한 준비시간으로 인식하는 경향을 보였다. The purpose of this study is to apply network-based semantic network analysis to explore the leisure perceptions among Young Single-Person-Households and provide empirical basic data for the study of leisure policy. To this end, this study explored leisure perceptions with Young Single-Person-Households through answers related to attitudes, thoughts, and opinions about leisure in their groups, revealing their leisure awareness characteristics. The target of the study is a young single-person-households of one aged 20-34, currently living in Seoul. For the selection of a research target, a significant sample extraction method, one of the non-probability sampling methods, was used to respond to the survey using self-administered method. The data of this study was 201 qualitative major word data collected from through the questionnaire that has been, selected and cleansed. Based on the data I have calculated the frequency of co-occurrence of major words using KrKwic, and calculated the matrix using KrTitle. The total number of calculated sentences was 1,206 and the total number of extracted words was 1,945. Also, the number of independent words was 189. Then, the centrality value was calculated using UCINET6 and the network was visualized using the Netdraw program, and clustered through CONCOR analysis. The results of these research methods and analyses are as follows. The study found that the leisure perception of Young Single-Person-Households was forming relationships and connection strength based on words such as ‘time’, ‘money’, ‘daily’, ‘stress relief’ and ‘burden’. They took leisure as a time or an active definition. And they have positive perception of the overall image and function of leisure, but negative perception in areas related to leisure participation conditions. In addition, they tended to recognize leisure as a preparation time for labor.
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Nicotinamide Exerts Antioxidative Effects on Senescent Cells
Kwak, Ju Yeon,Ham, Hyun Joo,Kim, Cheol Min,Hwang, Eun Seong Korean Society for Molecular and Cellular Biology 2015 Molecules and cells Vol.38 No.3
Nicotinamide (NAM) has been shown to suppress reactive oxygen species (ROS) production in primary human fibroblasts, thereby extending their replicative lifespan when added to the medium during long-term cultivation. Based on this finding, NAM is hypothesized to affect cellular senescence progression by keeping ROS accumulation low. In the current study, we asked whether NAM is indeed able to reduce ROS levels and senescence phenotypes in cells undergoing senescence progression and those already in senescence. We employed two different cellular models: MCF-7 cells undergoing senescence progression and human fibroblasts in a state of replicative senescence. In both models, NAM treatment substantially decreased ROS levels. In addition, NAM attenuated the expression of the assessed senescence phenotypes, excluding irreversible growth arrest. N-acetyl cysteine, a potent ROS scavenger, did not have comparable effects in the tested cell types. These data show that NAM has potent antioxidative as well as anti-senescent effects. Moreover, these findings suggest that NAM can reduce cellular deterioration caused by oxidative damage in postmitotic cells in vivo.
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