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강진규 ( Jingyu Kang ),김관수 ( Kwansoo Kim ) 한국농업경제학회 2020 農業經濟硏究 Vol.61 No.4
Since 2014, fine dust particles have emerged as one of major social issues in South Korea. The density of fine dust has been announced in the weather forecast since then, and the number of related media reports has rapidly increased. As the hazard of fine dust has been recognized, comfort food consumption has begun in order to reduce anxiety. Pork belly is a typical comfort food due to the myth that the fat in it helps release fine dust. The research question is how consumption behavior changes, as the fine dust problem is taken seriously under condition that a groundless belief, that pork belly is effective in getting fine dust out of the body, is widespread. It is assumed that the more seriously the problem is taken, the more pork belly consumption occurs. The Almost Ideal Demand System (AIDS) is used to test the hypothesis. The relationship between pork belly consumption and the density of fine dust was previously analyzed. This study additionally finds the effect of the number of media reports regarding fine dust particles. Note that fine dust has been recognized as a serious problem since 2014, when related reports have remarkably increased. Using the AIDS model, we examined how the expenditure share of pork belly, pork excluding pork belly, beef, chicken, or other meat depends on explanatory variables such as the price of each item, the density of fine dust, and the proportion of news reports. We found that, when the ratio of related reports increases, the expenditure share of pork belly grows. An elasticity analysis shows that consumption of pork belly increases, as fine dust-related reports ratio is higher. When the ratio increases by 10%, consumption of pork belly increases by 0.33%. This phenomenon is based on the myth, which people believe in that pork belly is effective in getting fine dust out of the body. The problem is that belief lacks scientific evidence. If consumption of pork belly increases because of inaccurate information, consumers may fail to achieve maximum utility.
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A Current-Mode Boost Converter with Wide Bandwidth Inductor Current Sensor
Jihwan Lee(이지환),Junyeol Jeon(전준열),Jeongpyo Park(박정표),Mingyu Jeong(정민규),Jingyu Kang(강진규),Changsik Yoo(유창식) 대한전자공학회 2018 전자공학회논문지 Vol.55 No.10
본 논문은 넓은 주파수 대역폭의 인덕터 전류 센서를 갖는 전류 모드 제어 부스트 컨버터를 소개한다. 제안하는 current-mirror 기반의 인덕터 전류 센서는 추가적인 feedback loop이 없어 높은 정확성과 넓은 주파수 대역폭을 갖는다. 부스트 컨버터는 180-nm BCDMOS 공정으로 제작되었으며 실리콘 면적은 2200-μm × 2200-μm이다. 부스트 컨버터는 1-MHz의 switching 주파수에서 동작하며 3-V의 입력 전압, 3.5-V에서 5-V의 출력 전압 범위를 가진다. 출력 전압 ripple은 33-mV 이내이며 최대효율은 95-%에 달한다. This paper presents a current-mode boost converter with wide bandwidth inductor current sensor. The proposed inductor current sensor is based on current-mirror without any feedback loop, allowing high accuracy and wide bandwidth. The boost converter has been fabricated in a 180-nm BCDMOS process occupying the silicon area of 2200-μm × 2200-μm. Operating at 1-MHz switching frequency, the boost converter provides the output voltage ranging from 3.5-V to 5-V from 3.0-V input. The output voltage ripple is smaller than 33-mV and the peak power efficiency is 95-%.
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