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태양광발전기와 변속기를 장착한 저속 전기차의 개발과 활용
엄기증(Gi Jeung Um),정천기(Cheon-Kee Jeong),신광문(Kwang Mun Shin) 한국에너지기후변화학회 2019 한국에너지기후변화학회 학술대회 Vol.2019 No.11
At present, major countries in the world are actively pursuing environmentally friendly automobiles to improve the air quality and reduce oil consumption for national security. In addition, interest in low-speed electric vehicles (NEV) is increasing due to the steady increase of single-person households and the incidence of near-field mobility in farming, fishing villages, and urban areas. [Speed <= 60km/h, Weight <= 1,361kg (Including batteries)] Currently, most low-speed electric vehicles in developed countries such as the US use 72V (12V×6) of battery power and operate at maximum speed (40km/h) and mileage (30 ~ 50km) / 1 time charging. Charging time (4~6 hours), battery life (about 1,000 cycles), lowest price (approx. 12 million won), low-speed charging method using single-phase power for home is the mainstream. It has been pointed out that the decrease in energy efficiency of vehicles can be a limiting factor for the expansion of supply. Given the low-speed EV market, which is expected to continue to grow in the future, real-time charging (RTC) while moving and stopping enhances user convenience, improves access to insufficient charging infrastructure, and extends life, distributes power. There is a need to improve the energy efficiency of the entire low-speed electric vehicle (NEV) system using an improved transmission and solar charging device.
깻잎의 active MA 소포장이 유통기간 중 신선도 유지에 미치는 영향
정천순(Cheon Soon Jeong),엄기증(Gi Jeung Um),박종남(Jong Nam Park) 한국원예학회 2010 원예과학기술지 Vol.28 No.6
깻잎을 active MA 소포장 후 실온(약 27℃)에서 호흡, 이취 관련 물질 및 신선도 유지효과에 관한 연구결과는 다음과 같다. 저장기간 중 호흡율은 무처리 및 저산소 처리구(CO₂:O₂:N₂=6:2:92, 0:10:90) 보다 고산소 처리구(0:30:70 및 0:50:50)에서 높게 유지되었고, 에틸렌 발생도 다소 높았다. 그러나 이취관련 물질인 아세트알데히드 및 에탄올 발생은 고산소 처리구에서 현저하게 낮았다. 중량감소율은 무처리 및 저산소 처리구에서 약 1.8%, 고산소 처리구에서는 1.4%로 낮았지만, 저장 5일째는 유사한 경향을 나타냈다. Ascorbic acid 함량은 저장 1일에 13.3㎎/100g F.W.이었고, 저장 3일에 무처리구에서 8.8㎎/100g F.W.으로 가장 낮았으나, active MA 처리구에서는 커다란 차이 없이 저장기간이 길어짐에 따라 다소 감소하는 경향을 보였다. 엽록소 함량은 저장 5일째는 무처리구에서 47.5(SPAD-502 unit)로 가장 낮았고, active MA 처리구에서는 약 53.0 수준으로 높게 유지되었다. 관능평가(시각)에서 저장기간 동안 서서히 감소되어 고산소 처리구(0:30:70 및 0:50:50)에서 저장 5일에 2.8로 상품성을 유지하였지만, 무처리 및 저산소 처리구에서는 상품성을 상실하였다. 이취발생은 저장 5일에 무처리구에서는 2.6으로 매우 낮았고, 고산소 처리구에서는 3.4 수준으로 높았다. 따라서 깻잎을 active MA 포장할 경우 실온에서(약 27℃) 일반 MA포장 보다는 2일정도 더 신선도 유지효과가 있었다. Research regarding respiration rate, off-flavor related material and freshness maintenance effect of active MA mini-packaging on perilla leaves has been carried in this study. Respiration rate was highly maintained at high oxygen treatments (CO₂:O₂:N₂=0:30:70 and 0:50:50), higher than non-treatment and low oxygen treatments (6:2:92, 0:10:90) during the storage period, and ethylene production was relatively higher. However, off-flavor related materials, acetaldehyde and ethanol production was noticeably low. Weight losses of non-treatment and low-oxygen treatment were about 1.8 and 1.4%, respectively. At the fifth day of storage there was no weight loss. Ascorbic acid content was 13.3 ㎎/100 g F.W. at the first day of storage. At the third day of storage non-treatment showed the lowest value of ascorbic acid, 8.8 ㎎/100 g F.W. Ascorbic acid content of active MA treatment gradually decreased without a striking difference as the storage day extended. Chlorophyll content was the lowest at the fifth day of storage with non-treatment, 47.5 (SPAD-502 unit) while the active MA treatment maintained high level of chlorophyll content, 53.0. Sensory evaluation (vision) showed that marketability gradually decreased but was maintained in high oxygen treatments (0:30:70 and 0:50:50), even at the fifth day of storage. Occurrence of off-flavor in non-treatment at the fifth day of storage was extremely low, 2.6; whereas high in high oxygen treatment, 3.4. Active MA packaging maintained freshness two more days at room temperature (about 27℃).
원대성 ( Dae Sung Won ),이상신 ( Lee Sangsin ),엄기증 ( Um Gi Jeung ),원소담 ( So Dam Won ),채희문 ( Hee Mun Chae ) 한국임학회 2014 산림과학 공동학술대회 논문집 Vol.2014 No.-
우리나라 백두대간은 난대에서 한대에 걸쳐 다양한 식생이 존재하고 특히 국토의 64%가 산림으로 구성되어 국소 지형적 입지환경에 따라 다양한 동식물이 생존하고 있다. 특히, 강원도의 백두대간은 국토의 상징이며, 풍부하고 다양한 생물 서식지로서 생태적 보전가치가 매우 뛰어나다. 본 연구의 목적은 장기간에 걸쳐 연구 모니터링 하여 향후 강원지역 백두대간 생태계 관리 정책에 필요한 기초 자료를 제공하기 위함이다. 따라서 본 연구에서는 강원권역 백두대간 내에 고도와 방위 사면을 고려하여 4개 권역 16개 조사지를 선정 하여 매 86일 간격으로 기온, 상대습도, 조도, 토양온도 데이터를 취합하여 분석 하였다. Korea experiences severe changes in local weather due to complex terrain, 64% of which consists of mountains. Baekdudaegan of korea exists variety of vegetation and wildlife across from temperate forest to freezing forest zone. Gangwon Province contains about 55% of the Baekdudaegan Mountain Protected Area core zone. Since this province is representative of the entire Baekdudaegan Mountain Protected Area. Our research areas were selected in the Gangwon Province area of Korea`s Baekdudaegan Mountain using to weather variables in relation to altitude. Therefore, this study was conducted to provide of basic data for ecological management policy on Baekdudaegan Mountain of Gangwon province. This study analysed to temperature, relative humidity, light intensity and soil temperature at 14 study sites on 4 districts of Baekdudaegan Mountain of Gangwon province.