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초고온 호기성 퇴비화 공정의 복합 악취 및 악취 물질 평가
박세용(Park Seyong),정대혁(Jung Dai-Hyuck),유의상(Yoo Eui-Sang),김문일(Kim Moonil) 한국지반환경공학회 2009 한국지반환경공학회논문집 Vol.10 No.5
본 연구는 정읍시에서 배출되는 하수 슬러지, 축산 분뇨, 음식물 쓰레기를 대상으로 Pilot Scale(100㎥) 초고온 호기성 퇴비화 공정에서의 복합 악취 및 12개 지정 악취물질을 평가하였다. 각각의 대상 물질은 종균과 혼합하였고 1차 50일, 2차 60일 기간동안 운전하였다. 호기성 퇴비화가 진행됨에 따라 1차, 2차 퇴비화공정에서 온도가 상승하여 약 90~95℃가 되었다. 악취 분석을 위한 시료는 1차의 경우 퇴비상부에서, 2차의 경우 Pilot Plant 경계지점에서 채취하였다. 지정 악취 물질 12개 항목의 기기 분석에서 악취의 주요 원인으로는 암모니아, 메틸머캅탄, 디메틸다이설파이드, 트리메틸아민이었다. 초기 복합악취의 농도는 퇴비화 공정이 끝난 후의 농도보다 높았지만 규제기준을 넘지 않았다. 초고온 호기성 퇴비화 공정에서는 적절한 교반시점과 발효 온도가 악취 발생의 중요한 인자라고 판단된다. This study was conducted to evaluate production of complex odor and 12 specific odorous compounds in a pilot-scale (capacity : 100 ㎥) ultra thermophilic aerobic composting. There were three types input: municipal wasted sludge, livestock manure and slurry, and food waste produced in Jung-Eb city. Each raw material was mixed with seed material and operated for two periods (1st : 50 days, 2nd : 60days). During composting, the temperature hit 90~95℃ after every mixing in both periods. Therefore, it was concluded that increasing temperature also saves the time which required for composting and high reduction of organics and water contents. The primary odorous compounds were ammonia, methyl mercaltan, dimethyl disulfide and trimethylamine. The concentration of the primary compounds and complex odor during the operation were higher than those on final day and most compounds did not exceed the allowable exhaust standard for odor. Also, it was found that optimal mixing time and control of high temperature are the most important parameters for odor control in ultra thermophilic aerobic composting.
Seyong Choi,Jang-Hee Yoon,Mi-Sook Won,Byoung-Seob Lee,Jung-Woo Ok,Byoung Chul Kim,Jin Yong Park,Jung Ho Kim,Shi Xue Dou,Se-Hee Lee,Kiyoshi, T. Institute of Electrical and Electronics Engineers 2012 IEEE transactions on applied superconductivity Vol.22 No.3
<P>We propose two methods to predict the AC transport current losses of MgB<SUB>2</SUB> superconducting wires with respect to various operating currents (I<SUB>tr</SUB>) and temperatures (T). Firstly, the transport current loss was estimated by a numerical method (finite element analysis). In order to consider the highly nonlinear behavior of the superconducting properties according to magnetic flux density (B) at each temperature, the measured J<SUB>c</SUB> - B - T characteristics were used in the calculation. The numerical results were compared with these of conventional Norris theory and showed quite good coincidence. A second method to predict the transport current loss at various temperatures, which used a loss at a specific temperature and the critical current data, is suggested. We deduce a formula for the prediction of the loss by a simple analogy through normalization, which performs excellently. The comparison of the transport current loss values calculated using the two methods is addressed.</P>
Seyong Jung,Jisung Lee,Byungjun Park,Sangkwon Jeong,Junseok Ko,Jeonghyun Lee,Younghee Han,Jeongphil Lee,Byungchul Park,Hyerim Kim,Taehyun Sung IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3
<P>This paper presents an idea for a thermosiphon that uniquely implements two integrated evaporators to cool two HTS (High Temperature Superconductor) bulk sets in different locations, simultaneously. A so-called double-evaporator thermosiphon was designed, fabricated and tested using nitrogen as the working fluid under sub-atmospheric pressure conditions. The operating target temperature was approximately 65 K. To confirm the feasibility of the double-evaporator thermosiphon, experiments during the cool down process and steady state operation were extensively conducted on the double-evaporator thermosiphon (L<SUB>tot</SUB> = 1075 mm, d<SUB>o</SUB> = 160 mm). The double-evaporator thermosiphon worked successfully at steady state operation. The results showed that it had a maximum total temperature difference between the condenser and the evaporator of 1.3 K and a temperature difference between the two evaporators of 0.6 K at a heat flow of 87 W. This thermosiphon was designed for actual application to a 100 kWh SFES (Superconducting Flywheel Energy Storage) system. The potential impact of superior heat transfer characteristics of the double-evaporator thermosiphon is discussed in the paper.</P>
Developing a decision support system for selecting new crops
Jung, Guhyun,Jeon, Myounghee,Lee, Jinhong,Park, Heundong,Lee, Seyong,Kim, Joonyong Korean Society of Food and Agricultural Informatio 2018 Agribusiness and Information Management Vol.10 No.2
Due to changes in the agricultural market environment and both overseas and domestic farming conditions, uncertainties in agricultural production and management are becoming greater. Hence, there is a stronger need for farmers to choose crops in the optimal condition. This research aims to introduce the result and process of developing a decision support system for selecting crops, aimed to assist farmers in selecting the optimal crops most suitable in the given situation. There are basically three main factors to consider in the decision-making process for farmers when selecting a crop to introduce to their lands. First of all, one must consider how much profit crop A will produce when it is cultivated. Secondly, one must consider which crop to cultivate in order to earn a certain amount of profit. Thirdly, one must consider what is the best way to maximize Farm A's business profit. For instance, a farm may have land as its resource, and one must research which location, type of crop, level of technology, and so forth, to maximize profit.This research creates a database of the profitability of a total of 180 crop types by analyzing Rural Development Administration's survey of agricultural products income of 115 crop types, small land profitability index survey of 53 crop types, and Statistics Korea's survey of production costs of 12 crop types. Furthermore, this research presents the result and developmental process of a web-based crop introduction decision support system that provides overseas cases of new crop introduction support programs, as well as databases of outstanding business success cases of each crop type researched by agricultural institutions.
SportLight: statistically principled crowdsourcing method for sports highlight selection
Jung Jiwon,Ha Seyong,Son Won,이준환,Won Joong-Ho 한국통계학회 2022 Journal of the Korean Statistical Society Vol.51 No.1
Sports highlight selection has traditionally required expert opinions and manual labor of video editors. To automate this laborious task, crowdsourcing viewers’ live comments has recently emerged as a promising tool, which can remove the burden of extracting semantic information by computer vision. However, popular crowdsourcing methods based on peak-finding are sensitive to noise and may produce deviant highlights from the expert choice. To increase the accuracy of automated selection of sports highlight, we introduce a statistically sound crowdsourcing method, SportLight. In this work, we take a statistical approach that combines multiple hypothesis testing and ℓ1-trend filtering (fused lasso), supported by a computationally inexpensive algorithm. By analyzing 29 baseball games played in the 2016 and 2017 seasons, we demonstrate that our approach properly reduces the risk of false alarm and generates the results closer to expert-chosen highlights than that of the peak-finding method.
Superconducting Dipole Magnet for Strangeness Physics Program at J-PARC
Jung Keun Ahn,Sung Hyun Kim,Shin Hyung Kim,Imai, Kenichi,Sako, Hiroyuki,Seyong Choi,Takahashi, Toshiyuki Institute of Electrical and Electronics Engineers 2016 IEEE transactions on applied superconductivity Vol.26 No.4
<P>A large-acceptance superconducting dipole magnet is currently under construction for extensive strangeness nuclear physics programs at Japan Proton Accelerator Research Complex (J-PARC), Japan. The conduction-cooled superconducting magnet is composed of two circular coils with a radius of 500 mm, vertically 500 mm apart from each other. This Helmholtz-type magnet was designed to keep the field uniformity Br/By at the level of 1% over the inner region of 500 mm in diameter and 500 mm in height. Our main detector is a time projection chamber that uses parallel E and B fields. If there is a transverse component, drifting electrons would take helical paths due to the E⃗ × B⃗ effect. As a result, the field uniformity is crucial in the design of the magnet. The maximum field strength is 1.5 T. We report our design study and coil test results using a test cryochamber.</P>