• Journal of Power Electronics
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• 제18권1호
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• pp.171-184
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• 2018

Unbalanced and distorted grid voltages cause the grid side current of a current source PWM rectifier to be heavily distorted. They can also cause the DC-link current to fluctuate with a huge amplitude. In order to enhance the performance of a current-source PWM rectifier under unbalanced and harmonic grid voltage conditions, a mathematical model of a current-source PWM rectifier is established and a flexible multi-objective control strategy is proposed to control the DC-link current and grid-current. The fundamental positive/negative sequence, $5^{th}$ and $7^{th}$ order harmonic components of the grid voltage are first separated with the proposed control strategy. The grid current reference are optimized based on three objectives: 1) sinusoidal and symmetrical grid current, 2) sinusoidal grid current and elimination of the DC-current $2^{nd}$ order fluctuations, and 3) elimination of the DC-current $2^{nd}$ and $6^{th}$ order fluctuations. To avoid separation of the grid current components, a multi-frequency proportional-resonant controller is applied to control the fundamental positive/negative sequence, $5^{th}$ and $7^{th}$ order harmonic current. Finally, experimental results verify the effectiveness of proposed control strategy.

• Asian Pacific Journal of Cancer Prevention
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• 제14권7호
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• pp.4455-4457
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• 2013

In the new millennium people are facing serious challenges in health care, especially with increasing non-communicable diseases (NCD). One of the most common NCDs is cancer which is the leading cause of death in developed countries and in developing countries is the second cause of death after heart diseases. Cancer registry can make possible the analysis, comparison and development of national and international cancer strategies and planning. Information technology has a vital role in quality improvement and facility of cancer registries. With the use of IT, in addition to gaining general benefits such as monitoring rates of cancer incidence and identifying planning priorities we can also gain specific advantages such as collecting information for a lifetime, creating tele medical records, possibility of access to information by patient, patient empowerment, and decreasing medical errors. In spite of the powerful role of IT, we confront various challenges such as general problems, like privacy of the patient, and specific problems, including possibility of violating patients rights through misrepresentation, omission of human relationships, and decrease in face to face communication between doctors and patients. By implementing appropriate strategies, such as identifying authentication levels, controlling approaches, coding data, and considering technical and content standards, we can optimize the use of IT. The aim of this paper is to emphasize the need for identifying positive and negative effects of modern IT on cancer registry in general and specific aspects as an approach to cancer care management.

• 대한가정학회지
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• 제26권4호
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• pp.129-160
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• 1988

The purpose of the present study is to understand the change in the relation between mother-in-law and daughter-in-law according to the social change in comparison with the survey effects in 1974 (ko Jung-Ja) and 1985 to find out the cause of conflict in both side of power structure and affection structure, indicating behavior, the influences on the relationships among family, possible meditators. this thesis was made by an experimental research. Data were collected from 146 mothers-in-law and 141 daughters-in-law in Pusan. The collected data were analysed by statistical methods such is as follows, 1. cause of conflict In power structure the cause of conflict is, in the case of mother-in-law opinion opposion and shaughty attitude by daughter in-low and, in the case of daughter-in-law, domestic dominance. It is thought that there is a difference of viw\ew between mother-in-law and daughter-in-law about the possesion of economic dominance and many conflicts rises because of economic dominance. but the study in 1985 than 1974 suggests the possibility of conflict meditator because mother-in-law and daughter-in-law do homework dependently in the practice of power. In affection structure, the chief dissatisfaction toward daughter-in-law showes the change in time. In 1974, there was no affection and respect. In 1985, the rate of doing without consultation was high. Also, the lack of communication of mother-in-law and daughter-in-law is the cause of conflict. 2. Indicating behavior the rate of thinking alone if high in both sides. But in the survey of 1985, the covert verbal aggressive action with which mother-in-law appeals to her daughter and daughter-in-law to husband is rising. 3. Influence on the relationship among family by the conflict between mother-in-law and daughter-in-law. the conflict between mother-in-law and daughter-in-law play negative effects on the intimacy and relation between husband and wife. 4. Conflict mediation behavior As compremiser, it is suggested that in the case of daughter-in-law the position and role of husband is important and, in the case of mother-in-law respects mother-in-law, daughter-in-law and gives her the role.

• Asian Pacific Journal of Cancer Prevention
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• 제17권4호
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• pp.2041-2047
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• 2016

Background: Liver cancer (LC) is the sixth world most common cancer and the second leading cause of cancer death. Due to the importance and necessity of awareness about the incidence and mortality of diseases to perform prevention programs, this study focused on data for LC and its relationship with the human development index (HDI) and its components in Asia in 2012. Materials and Methods: This ecological study was based on GLOBOCAN data for Asian countries. We assessed correlations between standardized incidence rates (SIR) and standardized mortality rates (SMR) of LC with HDI and its components using of SPSS18. Results: A total of 582,420 incident cases and 557,097 deaths were recorded in Asian countries in 2012. The five with the highest SIR were Mongolia, Lao PDR, Vietnam, Republic of Korea and Thailand and those with the highest SMR were Mongolia, Lao PDR, Vietnam, Cambodia and Thailand. A negative relation was observed between HDI and LC for SIR of 0.049 (P=0.748) and for SMR of 0.07 (P=0.645), with life expectancy at birth a positive relation for SIR of 0.061 (P=0.687) and a negative relation for SMR of 0.079 (P=0.603), with the average years of education a negative relation fo SIR of 0.476 (p=0.952) and for SMR of 0.032 (P=0.832), and with the country income level per person a negative relation for SMI of 0.11 (p=0.465) and for SMR of 0.113 (P=0.455). Conclusions: The incidence of LC is more in less developed and developing countries but statistically significant correlations were not found between standardized incidence and mortality rates of LC, and HDI and its dimensions.

• Smart Structures and Systems
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• 제21권3호
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• pp.359-371
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• 2018

Strong seismic events commonly cause large drift and deformation, and functionality failures in the superstructures. One way to prevent functionality failures is to design structures which are ductile and flexible through yielding when subjected to strong ground excitations. By developing forces that assist motion as "negative stiffness forces", yielding can be achieved. In this paper, we adopt the weakening and damping method to achieve a new approach to reduce all of the structural responses by further adjusting damping phase. A semi-active control system is adopted to perform the experiments. In this adaptation, negative stiffness forces through certain devices are used in weakening phase to reduce structural strength. Magneto-rheological (MR) dampers are then added to preserve stability of the structure. To adjust the voltage in MR dampers, an inverse model is employed in the control system to command MR dampers and generate the desired control forces, where a velocity control algorithm produces initial required control force. An extensive numerical study is conducted to evaluate proposed methodology by using the smart base-isolated benchmark building. Totally, nine control systems are examined to study proposed strategy. Based on the numerical results of seven earthquakes, the use of proposed strategy not only reduces base displacements, base accelerations and base shear but also leads to reduction of accelerations and inter story drifts of the superstructure. Numerical results shows that the usage of inverse model produces the desired regulated damping, thus improving the stability of the structure.

• Journal of Preventive Medicine and Public Health
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• 제52권5호
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• pp.308-315
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• 2019

Objectives: Estimating influenza-associated mortality is important since seasonal influenza affects persons of all ages, causing severe illness or death. This study aimed to estimate influenza-associated mortality, considering both periodic changes and age-specific mortality by influenza subtypes. Methods: Using the Microdata Integrated Service from Statistics Korea, we collected weekly mortality data including cause of death. Laboratory surveillance data of respiratory viruses from 2009 to 2016 were obtained from the Korea Centers for Disease Control and Prevention. After adjusting for the annual age-specific population size, we used a negative binomial regression model by age group and influenza subtype. Results: Overall, 1 859 890 deaths were observed and the average rate of influenza virus positivity was 14.7% (standard deviation [SD], 5.8), with the following subtype distribution: A(H1N1), 5.0% (SD, 5.8); A(H3N2), 4.4% (SD, 3.4); and B, 5.3% (SD, 3.7). As a result, among individuals under 65 years old, 6774 (0.51%) all-cause deaths, 2521 (3.05%) respiratory or circulatory deaths, and 1048 (18.23%) influenza or pneumonia deaths were estimated. Among those 65 years of age or older, 30 414 (2.27%) all-cause deaths, 16 411 (3.42%) respiratory or circulatory deaths, and 4906 (6.87%) influenza or pneumonia deaths were estimated. Influenza A(H3N2) virus was the major contributor to influenza-associated all-cause and respiratory or circulatory deaths in both age groups. However, influenza A(H1N1) virus-associated influenza or pneumonia deaths were more common in those under 65 years old. Conclusions: Influenza-associated mortality was substantial during this period, especially in the elderly. By subtype, influenza A(H3N2) virus made the largest contribution to influenza-associated mortality.

• 한국운동역학회지
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• 제19권4호
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• pp.697-705
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• 2009

본 연구의 목적은 여성고령자들에 있어 젊은 여성과 비교해 Sit-to-Walk동작 시 낙상의 간접적인 요인이 될 수 있는 역학적 에너지를 비교분석 하는 것이다. 여성고령자 그룹 10명과 젊은 여성 그룹 10명이 본 연구를 위해서 참여하였고, 적외선 카메라와 두 대의 지면반력기를 통하여 역학적 에너지를 분석한 결과는 다음과 같다. 근 파워는 각속도와 근 모멘트의 변화에 따라 고관절의 무릎 및 고관절의 신전 국면시 두 그룹 모두 낮은 음의 일률을 보였고, 특히 고령자그룹에 더 낯은 음의 일률을 보였다. 역학적 에너지 일량에 있어서도 무릎관절과 고관절은 무릎 및 고관절 신전 국면에서 두 그룹 모두 음의 일량을 보였고, 특히 고관절은 전체국면에서 고령자 그룹에 있어 더 낮은 음의 일량을 보였다. 이러한 결과는 STW동작 시 고관절 대퇴근의 약화로 인한 에너지 손실(dissipation)은 고령자들의 낙상의 위험요소를 간접적으로 보여주는 것이라 여겨진다.

• Asia Marketing Journal
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• 제11권3호
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• pp.205-224
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• 2009

기업이 사회에서 차지하는 역할이 갈수록 증가하면서 기업이 수행해야 할 사회적 책임역시 증가하고 있다. 과거 일부 대기업을 중심으로 수행되어왔던 기업의 사회적 책임 활동(CSR)은 이제 소비자를 접하는 모든 기업에서 중요한 기업 활동의 일환으로 평가되고 있다. 이러한 기업의 사회적 책임 활동 중 소비자의 구매활동에 직접적이며 긍정적인 영향을 미치는 대의명분 마케팅(cause-related marketing)은 특히 많은 관심을 받고 있다. 국내에서 이러한 대의명분 마케팅의 모범적인 사례가 바로 한국 암웨이의 대의명분 마케팅 사례이다. 한국 암웨이는 2000년대 중반 일부 다단계업체들의 탈법적 활동으로 인해 악화되어진 소비자들의 인식을 '뉴트리라이트 어린이 건강 지킴이' 캠페인과 같은 대의명분 마케팅 활동을 통하여 극복할 수 있었다. 본 사례에서는 한국 암웨이가 10여년에 걸쳐 수행해 오고 있는 대의명분 마케팅 활동에 대하여 살펴본다. 특히 한국 암웨이의 대의명분 활동이 타 기업들의 사회공헌활동과 차별화 될 수 있었던 구체적인 요인을 살펴본다. 마지막으로 한국 암웨이의 대의명분 마케팅 활동에 대한 향후 방향과 시사점 등을 논의하였다.

• IMMUNE NETWORK
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• 제21권4호
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• pp.31.1-31.16
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• 2021

Gastric cancer (GC) is the fourth most common cause of cancer-related death globally. The classification of advanced GC (AGC) according to molecular features has recently led to effective personalized cancer therapy for some patients. Specifically, AGC patients whose tumor cells express high levels of human epidermal growth factor receptor 2 (HER2) can now benefit from trastuzumab, a humanized monoclonal Ab that targets HER2. However, patients with HER2^negative AGC receive limited clinical benefit from this treatment. To identify potential immune therapeutic targets in HER2^negative AGC, we obtained 40 fresh AGC specimens immediately after surgical resections and subjected the CD45⁺ immune cells in the tumor microenvironment to multi-channel/multi-panel flow cytometry analysis. Here, we report that HER2 negativity associated with reduced overall survival (OS) and greater tumor infiltration with neutrophils and non-classical monocytes. The potential pro-tumoral activities of these cell types were confirmed by the fact that high expression of neutrophil or non-classical monocyte signature genes in the gastrointestinal tumors in The Cancer Genome Atlas, Genotype-Tissue Expression and Gene Expression Omnibus databases associated with worse OS on Kaplan-Meir plots relative to tumors with low expression of these signature genes. Moreover, advanced stage disease in the AGCs of our patients associated with greater tumor frequencies of neutrophils and non-classical monocytes than early stage disease. Thus, our study suggests that these 2 myeloid populations may serve as novel therapeutic targets for HER2^negative AGC.

• 한국융합학회논문지
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• 제12권2호
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• pp.247-258
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• 2021

최근 조직들은 조직원에게 엄격한 정보보안 수준을 요구하고 있다. 엄격한 정보보안 정책 및 기술은 정보보안 관련 스트레스를 유발할 수 있다. 연구 목적은 지식공유행동 및 개인조직 적합성을 감소시키는 정보보안 기술 및 업무스트레스의 부정적 영향을 제시하는 것이다. 연구 대상은 정보보안 정책을 보유한 조직에서 근무하는 조직원이며, 연구가설은 309개의 표본을 활용하여 구조방정식모델링으로 검증한다. 연구 결과, 개인조직적합성이 지식공유행동에 긍정적 영향을 주었으나, 업무스트레스가 부정적 영향을 주었다. 또한, 기술스트레스가 개인조직 적합성에 부정적 영향을 미쳤다. 추가적으로, 업무모호성이 개인조직 적합성과 지식공유행동사이에 조절효과를 가졌다. 연구 시사점은 조직원의 정보보안 기술 및 업무 스트레스의 부정적 영향을 확인하였으며, 내부자의 부정적 행동 최소화를 위한 방향을 제시한다.