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류승형,서영주,박준우,김신동,박성순 한국폐기물자원순환학회 2017 한국폐기물자원순환학회지 Vol.34 No.5
This study was carried out to examine the characteristics of hydrogen sulfide adsorption using an iron hydroxide-based adsorbent. The prepared adsorbent was discussed with regard to its adsorption capacity and analyzed via surface analysis methods to illustrate the physical characteristics of hydrogen sulfide adsorption. As the drying temperature increased, the adsorption capacity of the adsorbent decreased from 29.15wt% to 22.73wt%. The adsorption capacity was decreased as the space velocity increased and showed an adsorption capacity of about 3.65 at 3,157.6 h−1. The effect of sulfur dioxide was to decrease the adsorption capacity from 29.15wt% to 27.94wt%. The adsorbent exhibited the amorphous type in its physical appearance based on XRD and EDS analysis.
옥살레이트 침전법에 의한 폐솔더 박리액에서 주석 및 구리의 회수
류승형,안재우,안효진,김태영,Ryu, Seong-Hyung,Ahn, Jae-Woo,Ahn, Hyo-Jin,Kim, Tae-Young 한국자원리싸이클링학회 2014 資源 리싸이클링 Vol.23 No.3
폐솔더 박리액으로부터 옥살산 침전법을 이용하여 주석 및 구리의 분리 침전을 통해 각각 금속염으로 회수하기 위한 기초 연구를 실시하였다. 먼저 옥살산의 첨가에 따라 주석의 침전 제거율이 증가하였으며 당량비(옥살산/주석)의 1.0-1.5배를 첨가할 경우 주석이 99.5%의 이상 제거율을 나타내었다. 이 경우에 구리는 2.0% 정도 침전되었고 철, 납등은 침전되지 않아 주석만 선택적으로 침전되는 것을 확인 하였다. 반응온도 증가에 따라 주석의 침전율은 증가하여 $60^{\circ}C$ 부근에서 최대값을 보이다가 온도가 더 증가하면 오히려 감소 경향을 보였다. 침전물을 여과 건조시켜 $SnO_2$의 산화물을 얻을 수 있었다. 주석이 제거된 폐솔더 박리액에 옥살산을 첨가하여 구리를 납, 철 등의 금속이 선택적으로 약 91% 이상 침전되어 회수가 가능하였다. A study has been made on the recovery of tin and copper from waste solder stripper by oxalate precipitation. With the increasing of the oxalic acid addition, tin was precipitated effectively and removed above 99.5% of tin when the oxalic acid, in an amount 1.0-1.5 times the stoichometric requirement, was added. But, in this case, only 2.0% of copper was precipitated and lead, iron were not precipitated. So, tin was selectively removed from the waste solution. With the increasing of the reaction temperature, the removal percentage of tin was increased and maximum value at arounf $60^{\circ}C$ and decreased with increase in the temperature any more. After filtering the precipitate and drying in oven, $SnO_2$ was obtained from the precipitate. After removal of tin in stripping solution, above 91% of copper was selectively removed by Cu-oxalate by addition of oxalic acid.
류승형,김태영,안낙균,강명식,안재우,안종관,Ryu, Seong-Hyung,Kim, Tae-Young,Ahn, Nak-Kyoon,Gang, Myeong-Sik,Ahn, Jae-Woo,Ahn, Jong-Gwan 한국자원리싸이클링학회 2015 資源 리싸이클링 Vol.24 No.5
음이온 교환막을 이용한 확산투석에 의해 폐솔더 박리액으로부터 질산을 효율적으로 회수하기 위한 기초 연구를 실시하였다. 우선 모의용액 실험의 경우 유속, 유속비, 질산농도, 금속이온 종류 및 농도 등이 질산 회수율에 미치는 영향을 조사하였다. 유속이 증가함에 따라 질산 회수율은 감소하였고 급액에 대한 순수의 유속비(W/F)가 증가할수록 질산 회수율은 증가하여 유속비가 1.5이상에서 약 99%의 질산 회수율을 보였다. 급액중 질산용액의 농도가 증가함에 따라 3.0 M 까지는 산회수율이 증가 하였으나 3.0 M 이후로는 회수율은 점차 낮아 졌다. 확산투석막을 통과하는 금속이온의 투과율은 Pb, Na, Cu순 이었고, Fe과 Sn은 투과되지 않았다. 실제 폐솔더액을 사용하여 유속 $0.9L/hr-m^2$, W/F = 1.3 으로 확산 투석을 실시한 결과 약 94%의 질산 회수율을 얻을 수 있었다. A basic study was conducted to effectively recover nitric acid from a waste solder stripper by diffusion dialysis using anion exchange membranes. The effects of flow rate, flux ratio, nitrate concentration, and metallic ion types and concentration on the recovery percentage of nitric acid were investigated. The recovery percentage of nitric acid was decreased with the increase of flow velocity. But the recovery percentage of nitric acid was increased as the increase of flux ratio(W/F) and showing a recovery percentage of nitric acid of about 99% at a flux ratio of 1.5 or more. As the increase of nitric acid concentration in feed solution, the recovery percentage of nitric acid was increased up to 3.0M, but in case of greater than 3.0M, the recovery percentage gradually was decreased. Leakage percentage of metallic ions through the membrane were in the order of Pb, Na and Cu but Fe and Sn did not leakaged. As a result of diffusion dialysis using real waste solder stripper at a flow rate of $0.9L/hr-m^2$, W/F = 1.3, a recovery percentage of nitric acid of approximately 94% was gained.
Development of deep autoencoder-based anomaly detection system for HANARO
류승형,전병일,서호건,이민우,신진원,유용균 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.2
The high-flux advanced neutron application reactor (HANARO) is a multi-purpose research reactor at the Korea Atomic Energy Research Institute (KAERI). HANARO has been used in scientific and industrial research and developments. Therefore, stable operation is necessary for national science and industrial prospects. This study proposed an anomaly detection system based on deep learning, that supports the stable operation of HANARO. The proposed system collects multiple sensor data, displays system information, analyzes status, and performs anomaly detection using deep autoencoder. The system comprises communication, visualization, and anomaly-detection modules, and the prototype system is implemented on site in 2021. Finally, an analysis of the historical data and synthetic anomalies was conducted to verify the overall system; simulation results based on the historical data show that 12 cases out of 19 abnormal events can be detected in advance or on time by the deep learning AD model
양극성 장애 환자에서 나타나는 식욕 및 섭식 행동의 특성 : 일반적 음식갈망-특질척도(G-FCQ-T)와 약물 관련 섭식행동 설문지(DR-EBQ)를 이용한 평가
이선이,류승형,고효정,홍경수,남희정,Lee, Sunny,Ryu, Seung-Hyong,Ko, Hyo-Jung,Hong, Kyung-Sue,Nam, Hee-Jung 대한생물정신의학회 2011 생물정신의학 Vol.18 No.4
Objectives In the current study, we quantitatively estimated changes in appetite and eating behavior of bipolar disorder patients during the pharmacotherapy. We also investigated their contribution to the weight gain and their association with specific food-craving characteristics of the patients. Methods Subjects included forty-one bipolar disorder patients and fifty-six controls. Currently sustained natures of food craving were assessed using the General-Food Craving Questionnaire-Trait (G-FCQ-T) and changes in appetite and eating behavior were measured using the Drug-Related Eating Behavior Questionnaire (DR-EBQ). Results Compared to the control group, the patients' group showed significantly higher body mass index (t=2.028, p=0.045). The patients' group had significantly higher 'Preoccupation with food' factor score of G-FCQ-T (p=0.016) than that of the control group. Hierarchical multiple regression analysis showed that only 'preoccupation with food' factor independently predicted psychotropic medication-induced appetite change. Conclusions Appetite change while receiving psychotropic medication seems to be related to the weight-gain and associated with craving natures of 'preoccupation with food' in bipolar disorder. Appetite and/or eating behavioral changes measured by G-FCQ-T and DR-EBQ could be regarded as an important mediating factor in future studies exploring biological mechanisms of weight gain related with pharmacotherapy for bipolar disorder.