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- 저자 : 최형국(Hyun Kook Choi) (검색결과 5 건)
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박장현(Jang-Hyun Park),최형국(Hung-Kook Choi) 한국차학회 2000 한국차학회지 Vol.6 No.1
The effect of shading on shoot yield and T-N(Total-Nitrogen), T.A.A(Total Amino Acids), tannin, free amino acids and free sugars content of tea shoot was examined under different shade periods. The results are summarized as follow. The soil of experimental field was higher in organic matter(40.3g/kg), available phosphate(1,149mg/kg) and C.E.C(18.9cmol⁺/kg) compared to the general field, but lower in pH(5.1) compared to the general field. The yield of tea leaves was increased with the passage of shade treatment periods. The yield of tea leaves was the lowest in the 14 days shading as 163kg/10a, while the yield was the highest in the 27 days shading as 315kg/10a. The contents of total nitrogen, total amino acid was decreased with the passage of shade treatment period, while the content of tannin, caffeine and vit. C was increased from 21 days to 26 days shading, but decreased from 27 days shading. Most of free amino acid contents such as aspartic acid, theanine, serine, glutamic acid and arginine was decreased with the passage of shade treatment periods : however, the content of valine, isoleucine and leucine was increased. The content of free sugar was the lowest in the 16 days shading as 690.0mg/100g while the content of free sugar was the highest in the 24 days as 885.0mg/100g. Consequently, 22~23 days shade treatment periods is considered to be the best shade periods in terms of high quality as well as crop yield.
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The Yield and Quality of The Second Harvest Tea related to Slow-Release Fertilizer Application
박장현(Jang-Hyun Park),김정근(Jong-Keun Kim),임근철(Keun-Cheol Lim),최형국(Hyung-Kook Choi) 한국차학회 2005 한국차학회지 Vol.11 No.1
량은 관행시비(262㎏ 10a-1)에 비해 완효성비료구는 N=40㎏ 10a-1를 제외하고 260~277㎏ 10a-1로 3.1~8.8% 증수하였다. 관행시비에 비해 완효성비료구 N=40㎏ 10a-1를 제외하고 질소 흡수율이 0~0.85㎏ 10-1 높았고, 질소 이용률은 질소 시비량이 증가할수록 감소하였다. 관행시비에 비해 완효성비료 N=50㎏ 10a-1를 제외한 나머지 구는 총질소, 총아미노산, tannin, caffeine, 엽록소, 비타민C, 지방산 함량과 감칠맛 주성분인 theanine, glutamic acid, arginine 함량이 적은 편이었다. 형상, 향, 맛 등 제다 품질은 완효성시비구가 관행시비에 비해 -1.7~4.6점 정도 우수하였다. 결론적으로 완효성비료구 중 N=50㎏ 10a-1구가 관행시비에 비해 우수한 이유는 비료성분이 서서히 용출되어 나와 지속적으로 작물에 공급되어 효율적으로 이용되어지기 때문이라 생각된다. The yield of slow-release fertilizer blocks except the block with N=40kg 10a-1 increased to 260~277kg 10a-1 which is 3.1~8.8% higher, compared to the traditional fertilizer application(262kg 10a-1). Compared to the traditional fertilizer, the rate of uptaking nitrogen in slow-release fertilizer blocks save the N=40kg 10a-1 block is 0~0.85kg 10a-1 higher than that of the traditional one, but the nitrogen efficiency declined. The rest blocks but N=50kg 10a-1 block had less total nitrogen, total amino acid, tannin, caffeine, chlorophyll, vitamin C, fatty acid, theanine, glutamic acid and arginine than the traditional one had. The qualities such as appearance, scent, savor in slow-release fertilizer are -1.7~4.6 points superior to those of the traditional one. In conclusion, the reason why N=50kg 10a-1 block out of slow-release fertilizer blocks is superior to the traditional one is that the components of the fertilizer slowly and continuously came out and was used effectively into the plants.
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박장현(Jang Hyun Park),김영옥(Yong-Ok Kim),국용인(Yong-In Kug),조덕봉(Duk-Bong Cho),최형국(Hong-Kook Choi) 한국식품영양과학회 2003 한국식품영양과학회지 Vol.32 No.7
녹차를 이용한 기능성 면류를 제조하기 위해서 가루녹차를 밀가루에 1, 2, 3, 5, 7.5 및 10% 첨가하여 제조한 생면의 품질 특성 변화를 조사하였다. 가루녹차의 첨가 농도가 증가함에 따라 아밀로그래프상의 호화개시 온도는 증가하였고, 최고 점도와 최종 점도는 감소하였다. 조리면의 성질도 가루 녹차 첨가량이 증가함에 따라 무게와 부피는 상대적으로 감소함을 보였고, 탁도는 증가하였다. 표면색의 측정 결과 L값과 a값은 감소하였고, b값은 증가하였다. 조리면에 대한 TPA(texture profile analysis) 결과 가루녹차 2% 첨가까지는 견고성, 부착성, 탄력성, 씹힘성이 증가하였으나 3% 첨가부터 감소하였으며, 응집성은 첨가량이 증가함에 따라 감소하였다. 조리면의 관능검사 결과 가루녹차 1% 첨가시에 가장 좋은 품질로 평가되었다. The study was to investigate the quality of wet noodle added with the powder green tea. The wet noodles were prepared to the ratio of 1, 2, 3, 5, 7.5 and 10% (w/w) of the powder green tea based on a flour weight. The initial pasting temperature in an amylograph was increased as the increase of the powder green tea, while peak and final viscosity as the increase decreased. The weight and volume of cooked noodles were decreased, and turbidity of soup was increased with the addition of the powder green tea. L and a values of wet noodles were decreased with the addition of the powder green tea, and b value was increased. Texture profile analysis of cooked noodle showed a increase of hardness, cohesiveness, springiness, chewiness up to 2% powder green tea, but decreased from 3% power green tea. However, adhesiveness decreased as the increase of the powder green tea. From the sensory evaluation, the wet noodles included 1% powder green tea were similarly evaluated as the noodle used whole wheat flour.
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박장현(Jang-Hyun Park),임근철(Keun-Cheol Lim),최형국(Hong-Kook Choi) 한국차학회 2004 한국차학회지 Vol.10 No.1
Examinated results for bring light on the kinds of slow-release fertilizers are summarized as follows. Among slow-release fertilizers, the yields of the 3rd harvested tea leaves in the T₂ treatment was higher 5±3% with values of 306kb/10a than in other slow-release fertilizers treatment(284~300kb/10a), but was lower 2% than in traditional manuring(314kb/10a). The contents of chemical components such as total nitrogen, total amino acid, chlorophyll, vitamin C and free sugar in the slow-release fertilizers except T₂ treatment were slightly lower than in traditional manuring. However, the content of tannin and caffeine were slightly higer than in traditional manuring. The contents of theanine, glutamic acid and arginine as a good taste component of green tea were higher in the T₂ treatment than in the other slow-release fertilizers and traditional manuring. In scoring test, the slow-release fertilizers treatment were not different the traditional manuring significantly.
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조한상(Han Sang Cho),문영범(Young Bum Mun),문원식(Won Sik Moon),박대철(Dae Cheol Park),김형철(Hyeong Cheol Kim),최형국(Hyun Kook Choi) 大韓環境工學會 2015 대한환경공학회지 Vol.37 No.3
친환경 토목/건축소재가 각광받는 시대가 도래되면서 시멘트 산업에서의 철강슬래그 등의 산업부산물 up-cycling 사례가 계속 증가되는 추세이다. 본 연구에서는 국내.외적으로 재활용 사례가 거의 없는 서냉 전기로 환원슬래그의 up-cycling 용도 개발을 위한 목적으로 토양환경보전법 시행규칙 별표 3의 ‘토양오염우려기준’에 근거하여 환원슬래그에 대한 기초적인 환경위해성 평가를 수행하여, 환경적 측면에서의 사용 안전성을 검증하였다. 아울러 주요 온실가스 배출원인 시멘트 생산량을 줄이기 위한 방안으로, 보통 포틀랜드 시멘트 및 고로수쇄슬래그 시멘트에 혼화재로서 환원슬래그를 일부 치환한, 2성분계 및 3성분계 혼합시멘트를 제조하고, 각 혼합시멘트 모르타르의 압축강도를 평가하였다. 압축강도 평가 결과, 환원슬래그를 최대 5 wt%까지 치환한 두 종류의 혼합시멘트 모르타르들의 재령일 28일에서의 압축강도는 무치환시멘트 경우와 유사하거나 약 1.1배 우수함을 확인하였다. This study investigated the environmental risk for up-cycling of air-cooled ladle furnace slag (LFS) and evaluated the mortar compressive strength of binary and ternary blended cements using LFS of 3, 5, 10 wt%. Based on the Soil Environment Conservation Act standard, there was no environmental risk of the up-cycling of LFS. Results of mortar compressive strength assesment showed that the compressive strength of two blended cements using LFS of lower than 5 wt% was about 1.1 times superior to that of un-substituted cement (ordinary portland cement, OPC); however the compressive strength of those with LFS of 10 wt% decreased with 10% compared with that of OPC.
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