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국내에서 판매되는 어린이용 비타민·무기질 보충제의 종류와 함량
박하민(Park, Ha Min),전상아(Jeon, Sang A),이서진(Lee, Seo Jin),김지현(Kim, Jihyun),현태선(Hyun, Taisun) 충북대학교 생활과학연구소 2018 생활과학연구논총 Vol.22 No.1
This study examined the types of vitamin and mineral supplements sold for children in Korea and assessed the nutrient composition and the appropriateness of these products. A total of 343 vitamin and mineral supplements were identified using the search keyword “kids” on the homepage of the information portal managed by the Ministry of Food and Drug Safety. Data regarding the name, manufacturer, nutrient composition, nutrient content, and usage were obtained. Among the 343 products, 14.9% contained vitamins only, and 15.4% comprised minerals only. Thirty products (8.7% of total) were single vitamin compositions, and 48 were single mineral supplements. The most common nutrients to be found were vitamin C (70.0%) in single vitamin products, and calcium (50%) and zinc (50%) in single-mineral products. Vitamin D (64.9%) and vitamin C (56.2%) were the most frequently found, and zinc (58.9%) was the most prevalent mineral in the supplements that combined multivitamins and minerals. Although in more than 50% of the products, the suggested dosages were less than 150% of the Recommended Nutrient Intake (RNI) or the Adequate Intake for a daily dose, some of the products were found to be inappropriate for use. Amounts greater than the Tolerable Upper Intake Levels were found in 14 supplements containing zinc, 12 containing folic acid, and 9 containing magnesium. Further, 48 products consisted of vitamin C in amounts greater than 250% of RNI. The results of this investigation suggest, therefore, that parents should consult a trained dietician or should themselves have adequate knowledge about the nutrient composition of supplements and be capable of selecting the appropriate supplement for each child from the variety of vitamin and mineral products that are available at the counter
상사-부하 간 애매한 표현과 직설적 비판이 공손성과 커뮤니케이션 능력에 대한 인식에 미치는 영향 한-미 간 비교문화연구
범기수 ( Khi Su Beom ),박하민 ( Ha Min Park ) 한국PR학회 2014 PR연구 Vol.18 No.1
The purpose of this study is to explore differences/similarities between Korean and the U.S. people``s perception on equivocated messages in terms of politeness and communication competence. We used an experimental method in which college students in Korea and the U.S. were asked to imagine themselves in different manipulated scenariosequivocation used by a supervisor or a subordinate, and seek to answer the question of whether euquivocal messages is perceived differently in terms of participants`` evaluation on the politeness and communication competence. It was found that both Korean and the U.S. participants perceived supervisor``s and subordinate``s equivocal messages more polite than direct criticism. However, in Korea the equivocal message was considered as higher communication competence, whereas in the U.S. there was no difference between equivocal message and direct criticism. This study implicated that the differences of cultural values, such as individualism/ collectivism, power distance and high/low context culture, are important factor to understand the organizational communication and perception.
넓은 출력 전압 범위를 가지는 50kW급 급속충전용 DC-DC 컨버터의 최적 토폴로지 비교 및 선정
김진출(Jin-Chul Kim),박하민(Ha-Min Park),이주(Ju Lee),박진홍(Jin-Hong Park),임태욱(Tae-Uk Im),이재범(Jae-Bum Lee) 대한전기학회 2024 전기학회논문지 Vol.73 No.5
The introduction of high-voltage battery vehicles and the necessity of 400 kW-capacity EV ultra-fast-charging systems emphasize the requirement for DC-DC converters with wide output voltage ranges and high output capabilities Previously, 10 kW DC-DC converters were parallelly expanded to meet fast charging demands, but for 400 kW chargers, this approach necessitates excessive modules, increasing maintenance and complexity in system configuration and control. This paper analyzed DC-DC converter topologies, to establish an optimized design for DC-connected fast charging specifications. It proposes a topology that addresses the shortcomings of existing ones, designed to operate differently secondary side configuration of the converter for varying battery charging voltages. The proposed 50 kW DC-DC converter, when expanded for fast charging, is expected to offer substantial advantages in maintenance and system configuration.
넓은 출력 전압 범위를 가지는 50kW급 급속충전용 DC-DC 컨버터의 최적 토폴로지 비교 및 선정
김진출(Jin-Chul Kim),박하민(Ha-Min Park),이주(Ju Lee),박진홍(Jin-Hong Park),임태욱(Tae-Uk Im),이재범(Jae-Bum Lee) 대한전기학회 2024 전기학회논문지 Vol.73 No.5
The introduction of high-voltage battery vehicles and the necessity of 400 kW-capacity EV ultra-fast-charging systems emphasize the requirement for DC-DC converters with wide output voltage ranges and high output capabilities Previously, 10 kW DC-DC converters were parallelly expanded to meet fast charging demands, but for 400 kW chargers, this approach necessitates excessive modules, increasing maintenance and complexity in system configuration and control. This paper analyzed DC-DC converter topologies, to establish an optimized design for DC-connected fast charging specifications. It proposes a topology that addresses the shortcomings of existing ones, designed to operate differently secondary side configuration of the converter for varying battery charging voltages. The proposed 50 kW DC-DC converter, when expanded for fast charging, is expected to offer substantial advantages in maintenance and system configuration.