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Improvement of Energy Density in Supercapacitor by Ion Doping Control for Energy Storage System (에너지 저장장치용 슈퍼커패시터 이온 도핑 제어를 통한 에너지 밀도 향상 연구)

  • Park, Byung-jun;Yoo, SeonMi;Yang, SeongEun;Han, SangChul;No, TaeMoo;Lee, Young Hee;Han, YoungHee
    • KEPCO Journal on Electric Power and Energy
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    • v.5 no.3
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    • pp.209-213
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    • 2019
  • Recently, demand for high energy density and long cycling stability of energy storage system has increased for application using with frequency regulation (F/R) in power grid. Supercapacitor have long lifetime and high charge and discharge rate, it is very adaptable to apply a frequency regulation in power grid. Supercapacitor can complement batteries to reduce the size and installation of batteries. Because their utilization in a system can potentially eliminate the need for short-term frequent replacement as required by batteries, hence, saving the resources invested in the upkeep of the whole system or extension of lifecycle of batteries in the long run of power grid. However, low energy density in supercapacitor is critical weakness to utilization for huge energy storage system of power grid. So, it is still far from being able to replace batteries and struggle in meeting the demand for a high energy density. But, today, LIC (Lithium Ion Capacitor) considered as an attractive structure to improve energy density much more than EDLC (Electric double layer capacitor) because LIC has high voltage range up to 3.8 V. But, many aspects of the electrochemical performance of LIC still need to be examined closely in order to apply for commercial use. In this study, in order to improve the capacitance of LIC related with energy density, we designed new method of pre-doping in anode electrode. The electrode in cathode were fabricated in dry room which has a relative humidity under 0.1% and constant electrode thickness over $100{\mu}m$ was manufactured for stable mechanical strength and anode doping. To minimize of contact resistance, fabricated electrode was conducted hot compression process from room temperature to $65^{\circ}C$. We designed various pre-doping method for LIC structure and analyzing the doping mechanism issues. Finally, we suggest new pre-doping method to improve the capacitance and electrochemical stability for LIC.

Hemophagocytic Syndrome Presenting as Severe Acute Hepatitis (중증 급성 간염으로 발현한 혈구탐식증후군에 관한 연구)

  • Ryu, Jeong Min;Chang, Soo Hee;Kim, Joon Sung;Lee, Joo Hoon;Lee, Mi Jeong;Park, Kie Young;Kim, Kyung Mo;Seo, Jong Jin;Moon, Hyung Nam;Ghim, Thad;Chi, Hyun Sook
    • Pediatric Gastroenterology, Hepatology & Nutrition
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    • v.8 no.2
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    • pp.213-221
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    • 2005
  • Purpose: Hemophagocytic syndrome (HPS) is characterized by persistent high fever, hepatosplenomegaly, cytopenias, hypertriglyceridemia, and/or hypofibrinogenemia. Hepatic manifestations including overt hepatic failure and fulminant hepatitis are common in HPS. Liver transplantation (LT) should be considered in a case of fulminant hepatitis by other than HPS, but LT is contraindicated and complete cure is possible by chemotherapy in HPS. Therefore, we conducted this study to define the characteristics of HPS presenting as severe acute hepatitis. Methods: Among the total of 23 patients diagnosed as HPS by bone marrow examination between 1994 and 2005 in Asan Medical Center, 11 cases presented as severe acute hepatitis were enrolled in this study. We analyzed the clinical features, laboratory findings and outcome retrospectively. Results: Seven (64%) of the 11 children with HPS and hepatitis were referred to pediatric gastroenterologist at first. The mean age of onset was 50 months. There was no case with family history of primary HPS. Epstein-Barr virus was positive in 4, and herpes Simplex virus was positive simultaneously in 1 case. As the presenting symptoms and signs, fever was present in 10, hepatosplenomagaly was noted in all and jaundice in 10. Anemia was observed in 10, thrombocytopenia in 10, leukopenia in 8, hypertriglyceridemia in 9, hypofibrinogenemia in 8 and hyperferritinemia in 7 cases, respectively. Nine children received chemotherapy including etopside. The overall mortality rate was 72% (8/11). Conclusion: HPS, which needs chemotherapy, should be considered as a cause of severe acute hepatitis especially when accompanied with prolonged high fever and cytopenias.

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Effectiveness of Incentive-Therapy to Alcohol Abuser Using Single System Design (단일체계설계를 활용한 알코올남용 인센티브치료 효과성 연구)

  • Jang, Soo-Mi;Sim, Jung-Won
    • Korean Journal of Social Welfare
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    • v.58 no.4
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    • pp.291-312
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    • 2006
  • Incentive-Therapy approach on substance abuser has a solid theoretical base in Behavior Psychology and shows the effectiveness empirically in US. The purpose of this exploratory study was to evaluate the effectiveness of Incentive-Therapy on two alcohol abusers using ABA Single System Design in a community welfare agency, Korea. It proceeded for 12 week-baseline stage, 6-week intervention stage and 4-week postintervention stage through scanning whether alcohol abuser drinks or not by the alcohol analyzer as a target behavior. As a results, this study showed that two abusers' drinking were decreased in the middle of intervention stage in incentive-therapy but they showed differently in the postintervention stage : One sustained his abstinence and the other recurred to drink. Thus, we concluded Incentive-Therapy had better adaptability in community welfare agency in that alcohol abusers were driven to motivate for abstinence and then had an opportunity for psycho-social counseling and social welfare intervention consistently.

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Malignant Thrombi of Inferior Vena Cava from Renal Cell Carcinoma -4 cases reports- (신세포암에 의한 하대정맥 악성 혈전 -치험 4례-)

  • 홍종면;김오곤;이석재;노윤우;이조한;홍장수;김원재;임승운;안재호
    • Journal of Chest Surgery
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    • v.31 no.11
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    • pp.1097-1101
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    • 1998
  • Renal cell carcinoma involves the inferior vena cava(IVC) in approximately 5-10% of the patients. Presently surgical extirpation is the only form of therapy that can result in cure. Circulatory arrest with cardiopulmonary bypass is an operative technique that recently has been used to assist in resection of tumors that extend into the vena cava above the level of hepatic veins. We performed removal of tumor thrombi of IVC in 4 patients. All of them who had the renal cell carcinormas with infrahepatic vena caval extension were performed by standard surgical technique without cardiopulmonary bypass. But in one patient, inferior vena caval thrombectomy was done using circulatory arrest because of the recurred extension of the tumor thrombi within the vena cava above the insertion of the hepatic vein. All patients were recovered without any significant problems.

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Semiotic approach to Resort's Organizational Culture : Applying Greimas Actant Model (리조트 기업의 조직문화에 대한 기호학적 분석 : 그레마스 행위소 모형 적용)

  • Yang, Soung-Hoon;Moon, Bo-Young
    • The Journal of the Korea Contents Association
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    • v.20 no.5
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    • pp.500-512
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    • 2020
  • This research aimed to verify organizational culture of resort underlying bottom of organization and shared by employees. Healing-seeking and life style oriented experiences are in prevailing recently, which resort industry insomuch as presumably held from its origin. Unfortunately, it is also widely recognized that resort lost its entity, blurring business domains with hotel industry or yielding integrated resort by imitating theme park. In order to probe organizational culture, in-depth interview with 16 resort experts conducted in resort setting, prepared by Gremeis actant model which is effective in finding myth(story) structure of interviewees. Firstly, interviewer matched six actants with resort business involving-group and asked interviewee to metaphor freely based on 3 night resort experiences. Results showed that sender, receiver, subject, object, helper and opponent were matched with resort, visitor, company, product & service, supporters, and opponent group in orderly manners and also interviewees made each actant into metaphor as healing, patient, medical doctor, medicine, helper and charlatan, respectively. Significance and limitation of research were included in the end of article.

Design and Implementation of a Multiple Client Remote Management System using WMI (WMI를 이용한 다중 클라이언트 원격 관리 시스템 설계 및 구현)

  • Yeo, Myung-Ho;Park, Jun-Ho;Kang, Gwang-Goo;Kwon, Hyun-Ho;Lee, Jin-Ju;Lee, Ji-Hee;Choi, Hyoung-Rak;Jang, Su-Min;Seo, Won-Seok;Yoo, Jae-Soo
    • The Journal of the Korea Contents Association
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    • v.10 no.10
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    • pp.26-35
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    • 2010
  • Recently, multi client PC technologies that several users can use one set of computer at the same time are being designed to use the surplus computer resource. In general, as the existing PC management system considers only a single client PC that only one user uses a computer, various kinds of complicated problems may be arisen. This paper designs and realizes a remote management system that can monitor and control the information used in the windows based OS multi-client using WMI technology. The proposed system herein uses WMI technology and newly defined client management protocol and provides the monitoring and control functions on individual resource use information of multi-client. As well, it provides a communication function between the server and the client, and locking setting and access control functions.

Evaluating Pre-defined Kinetic Typography Effects to Convey Emotions (키네틱 타이포그래피를 통한 텍스트 기반 커뮤니케이션에서의 감정 전달 연구)

  • Lee, Joonhwan;Kim, Dongwhan;Wee, Jieun;Jang, Sooyeun;Ha, Seyong;Jun, Soojin
    • Journal of Korea Multimedia Society
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    • v.17 no.1
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    • pp.77-93
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    • 2014
  • Kinetic typography has been suggested to express emotions in computer-mediated communication (CMC) by empowering static texts with dynamic attributes, where conversations occur primarily in text-based forms. In this work, we investigate whether pre-defined kinetic typography effects are capable of delivering emotions, and further, which specific attributes of kinetic typography arouse such emotions. The results show that emotional response of users were corresponding to the emotions intended by experts, indicating that pre-defined kinetic typography is an applicable way to express emotions consistently in CMC. Also, results demonstrate some key attributes that derive certain levels of mood and energy respectively. Energy level turned out to be affected by the font size, transparency, direction of movement, amount of movement, velocity, and acceleration of the text, while mood level was influenced by the transparency, direction of movement, regularity in movement, and speed of the text.

A Clinical Study on the correlation between Bone Mineral Density (BMD) and Obesity in 480 normal adults (성인남녀 480명에서의 골밀도와 비만의 상관관계에 관한 임상적 연구)

  • Jang Soo-Jin;Kim Jeoung-Yeun;Yook Tae-Han
    • Journal of Acupuncture Research
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    • v.15 no.2
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    • pp.383-392
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    • 1998
  • Osteoporosis is the most common metabolic disease of the bone, and constitutes one of the most important major pubulic health problems world wide. Therefore, in order to be helped early diagnosis, treatment and prevention of osteoporosis, measurement of Bone Mineral Density (BMD) is to be needed. Authors has analysed Bone Mineral Density (BMD) of 480 normal adults who visited woo suk unoversity Oriental Meclical Center from April 1998 to July 1998. The aims of this study is to investigate correlation between Bone Mineral Density (BMD) and age distribution, to examine the correlation between Bone Mineral Density (BMD) and Obesity. The results were as follows. 1. In distribution of age, the peak bone density of lumbar spine was noted around 30 years, and the peak bone density of the femoral neck was noted around 20 years. The age related loss of bone density follows soon after peak density. And the signifficant difference was revealed between lumbar spine and femoral neck bone density (p<0.001) 2. In distribution of sex, the bone density in male was signifficantly higher than in female (p<0.001). 3. In the correlation between Bone Mineral Density (BMD) and Obesity, Bone Mineral Density (BMD) in obese group was signifficantly higher than in non-obese group. Especially, in female from 50 up to 69 years, BMD had a positive correlation with Body mass index(BMI).

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Co-occurrence of Domestic Violence and Drinking Problem - What is Experiences of Female Victims? - (가정폭력과 음주문제의 동시발생 - 피해여성의 경험은 무엇인가? -)

  • Kim, Ju-Hyun;Jang, Soo-Mi
    • Korean Journal of Social Welfare
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    • v.63 no.2
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    • pp.291-317
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    • 2011
  • This study was designed to explore the experiences of female victims who had abused by alcohol-abusing spouse. The results were deducted from in-depth interview with 10 female victims by utilizing Giorgi's phenomenological method. The results of research showed that experiences of women could be classified in three stages. From the lack of understanding stage, "ignorance of drunken violence" had appeared. "Confinement of vicious circle of drunken violence" and "dealing with drunken violence in the community" had been found from the coping stage. Finally, from the resting stage "re-defining of the relationship" had been drawn. Based on these results, the practical and political implications were suggested.

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Design and Implementation of Private Folder Management Systems for the Security of User Data on Multi-user Environments (다중 사용자 환경에서 개인 데이터 보안을 위한 개인 폴더 관리 시스템의 설계 및 구현)

  • Park, Yong-Hun;Park, Hyeong-Soon;Kim, Hak-Chul;Lee, Hyo-Joon;Jang, Yong-Jin;Lim, Jong-Tae;Jang, Su-Min;Seo, Won-Seok;Yoo, Jae-Soo
    • The Journal of the Korea Contents Association
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    • v.10 no.5
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    • pp.52-61
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    • 2010
  • In recent, the interests of multi-user systems have been increased. Multi-user systems allow a number of users to access the system simultaneously. Security is one of the key issues to be addressed in a multi-user environment. We propose a solution based on the NTFS file system that provides the personal data security and considers the convenience of users. The system increases the convenience of users by simplifying the complexity of the security setting on NTFS. We also propose a variety of policies that prevent from the conflicts incurring when different users set up the personal folders simultaneously and do not set up the important folders such as the window system folders as personal folders. In addition, our system supports the function of setting up the prohibition folder lists so that no one can not set the folder to their personal folders.