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Lim, Jung-Hyun,Park, Suh-young,Chae, Won-Byung,Kim, Sung-Kyeom,Choi, Seung-Kook,Yang, Eun-Young,Lee, Min-Ji,Park, Gyeong-Bin,Jang, Yoon-ah,Seo, Myeong-Hoon,Jang, Suk-Woo Korean Society for Agricultural Machinery 2017 바이오시스템공학 Vol.42 No.2
Purpose: We have studied the necessary qualities of seedlings of some leafy vegetables for a riding-type two-row automatic transplanter. When seedlings are planted using a transplanter, long roots may be rounded in the bottom of the tray, and this can interfere with the separation of the seedlings. Uprightness related to leaf spread angle is an important quality for seedlings in mechanical planting. Methods: To select cultivars suitable for the transplanter, we compared varieties of Kimchi cabbage (Chukwang, Daetong, Whipalam and Namdo), head lettuce (Abi and Sensation), cabbage (YR Onnuri, YR Hogel, Harutama, and Ogane), and broccoli (Nicegreen and Earlyyou). To compare the effect of bed soil on root formation and growth, we used five types of soil: Chologi, Burger, Wonjomix, Bio, and Baroker with 2.6-3 L per tray. Growth increment and the degree of root formation were measured according to the RDA guidelines 25 days after sowing for Kimchi cabbage and head lettuce and 44 days after sowing for cabbage and broccoli. Conclusions: According to the plug tray, the optimum seedling age in both 128- and 200-hole trays was 28 days for Kimchi cabbage and 44 days for cabbage and broccoli. Head lettuce took 35 days in 128-hole trays and 31 days in 200-hole trays. Burger soil was most effective for root formation and growth of the four kinds of leafy vegetables; it appeared that smaller soil volume led to faster root formation.
Lim, Jong Bin,Cha, Seung Hyeok,Hong, Suk Bong Elsevier 2019 Applied Catalysis B Vol.243 No.-
<P><B>Abstract</B></P> <P>Four cage-based, small-pore zeolites with similar framework Fe contents (0.7-0.9 wt%) but different framework structures (i.e., Fe-PST-7, Fe-LTA, Fe-SSZ-13, and Fe-RTH) have been synthesized and employed as direct N<SUB>2</SUB>O decomposition catalysts. When steam-activated, the light-off temperatures (770 K) for Fe-PST-7 and Fe-LTA were found to be about 40 K lower under wet feed conditions than that (810 K) for Fe-ZSM-5, the most widely studied catalyst for this reaction. Furthermore, their light-off temperatures were found to be even lower than the temperature (780 K) for Fe-FER, the best direct N<SUB>2</SUB>O decomposition catalyst. The overall characterization results of our study strongly suggest that the presence of strong Brønsted acid sites in zeolites, as well as the zeolite framework topology, has a profound effect on the type and distribution of extraframework Fe species, and therefore the N<SUB>2</SUB>O decomposition activity of supported Fe catalysts.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Isomorphously substituted Fe-PST-7, Fe-LTA, and Fe-RTH zeolites are synthesized. </LI> <LI> Fe-PST-7 and Fe-LTA show better N<SUB>2</SUB>O decomposition activity than Fe-FER and Fe-ZSM-5. </LI> <LI> The formation of large iron oxide particles in Fe-PST-7 and Fe-LTA is relatively unfavorable. </LI> <LI> N<SUB>2</SUB>O decomposition over supported Fe catalysts is affected by zeolite Brønsted acidity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lim, Sang-Soon,Kim, Ju-Heon,Kwon, Beomjin,Kim, Seong Keun,Park, Hyung-Ho,Lee, Ki-Suk,Baik, Jeong Min,Choi, Won Jun,Kim, Dong-Ik,Hyun, Dow-Bin,Kim, Jin-Sang,Baek, Seung-Hyub Elsevier 2016 JOURNAL OF ALLOYS AND COMPOUNDS Vol.678 No.-
<P><B>Abstract</B></P> <P>As a field-assisted technique, spark plasma sintering (SPS) enables densification of specimens in a very short period of time compared to other sintering techniques. For high performance thermoelectric material synthesis, SPS is widely used to fabricate nanograin-structured thermoelectric materials by rapidly densifying the nanopowders suppressing grain growth. However, the microstructural evolution behavior of thermoelectric materials by SPS, another important process during sintering, has been rarely studied. Here, we explore SPS as a tool to control the microstructure by long-time SPS. Using p-type (Bi<SUB>0.25</SUB>Sb<SUB>0.75</SUB>)<SUB>2</SUB>Te<SUB>3</SUB> thermoelectric materials as a model system, we systematically vary SPS temperature and time to understand the correlations between SPS conditions, microstructural evolution, and the thermoelectric properties. Our results show that the relatively low eutectic temperature (∼420 °C) and the existence of volatile tellurium (Te) are critical factors to determine both microstructure and thermoelectric property. In the liquid-phase sintering regime, rapid evaporation of Te leads to a strong dependence of thermoelectric property on SPS time. On the other hand, in the solid-phase sintering regime, there is a weak dependence on SPS time. The optimum thermoelectric figure-of-merit (Z) of 2.93 × 10<SUP>−3</SUP>/K is achieved by SPS at 500 °C for 30 min. Our results will provide an insight on the optimization of SPS conditions for materials containing volatile elements with low eutectic temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spark plasma sintering (SPS) is used to synthesize the thermoelectric (Bi<SUB>0.25</SUB>Sb<SUB>0.75</SUB>)<SUB>2</SUB>Te<SUB>3</SUB>. </LI> <LI> Liquid phase and volatile element are a key for the microstructure and thermoelectric property. </LI> <LI> Thermoelectric figure-of-merit of 2.9 × 10<SUP>−3</SUP>/K is achieved at 500 °C for 30 min. </LI> </UL> </P>
차석빈(Suk bin Cha),임주환(Ju whan Lim),이애자(Ae ja Lee) 한국외식경영학회 2000 외식경영연구 Vol.3 No.2
Using Korean restaurant owners sample, this study conducted an empirical research to examine the possibility of the development of the local traditional menu in Chonan area. Research findings reveal that respondents thought sausages as the local traditional menu followed by mung bean pancakes and duck food. Major problems of the local traditional menu were identified, including the lack of popularity, lack of special flavor, low profitability, and complex cooking method. Overall, no specific menus were revealed as the local traditional menu in Chonan area. For the development direction of the local traditional menu in the future, respondents suggested food made of walnuts for which Chonan is noted. Special importance of the local traditional menu was attached to the quality and flavor of food. Regarding selling and profitability of the local traditional gnu if developed in the future, they showed relatively high willingness to sell and expeckation of profitabffity. In conclusion, the necessity of the development of the local traditional menu among Korean restaurant owners in Chonan seems to be urgent. The article concludes with implications of the study results and suggestions for future research.
TRNSYS 건물 에너지 시뮬레이션 모델 캘리브레이션: GenOpt를 이용한 사례 연구
임흥빈(Lim, Heung-Bin),이경호(Lee, Kyoung-Ho),공민석(Kong, Min-Suk),서동현(Seo, Dong-Hyun) 한국건축친환경설비학회 2019 한국건축친환경설비학회 논문집 Vol.13 No.4
This paper demonstrates a calibration methodology for adjusting model parameters and factors using assistant tools - python and GenOpt. In this study, a building simulation model is developed for a demonstration building for a low-energy solar house. The model is composed of a 3D model describing building architecture and HVAC system model using TRNSYS simulation program. In this study, model calibration methodology consists of two phases in order to improve the accuracy of building energy model and reduce errors of simulation results: Parameter adjustment phase and factor optimization phase. Trial and error approach is used for the first phase and GenOpt tool is employed for the second phase to improve the model performance. Based on American Society of Heating, Refrigerating and Air-conditioning Engineers (ASHRAE) Guideline 14 indices, the performance of the calibrated building simulation model is evaluated to obtain Normalized Mean Bias Error (NMBE)hourly, values within ±10% and Coefficient Variation of Root Mean Square Error (CV (RMSE))hourly, values within 30%. The performance indices are calculated with simulated and measured temperatures of each indoor zone and buffer tank. Daily data is used for calibrating heat pump (HP) electrical energy consumption because it is hard to fit the operating time of HP which can be different to time that heating load occurs. As a result of the calibration process, it is found that the values of NMBEhourly and CV (RMSE)hourly achieves within followings: Average indoor temperature - NMBEhourly is 1.2% and CV (RMSE)hourly is 2.2%. Buffer tank temperature NMBEhourly is 1.5% and CV (RMSE)hourly is 8.2%. And the value of NMBEdaily and CV (RMSE)daily are used for HP electrical use as following: NMBEdaily is 9.5%, CV (RMSE) is 23.4%.