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정성수,김명진,Jung, Sungsu,Kim, Myung-Jin 한국자원리싸이클링학회 2016 資源 리싸이클링 Vol.25 No.4
전 세계적으로 해수로부터 자원을 회수하기 위한 연구가 활발히 진행되고 있다. 해수 중 붕소농도는 약 4.5ppm로 낮지만 해수 전체의 용량을 고려하면 용존량이 약 5조 4천억 톤에 이른다. 붕소는 300여종의 산업에 필수적으로 사용되는 자원으로 현재 우리나라는 붕소를 전량 수입하고 있고 연간 700억 원 이상을 붕소수입에 지출하고 있다. 본 글에서는 폐수와 해수로부터 붕소를 제거하거나 회수하는 국내 외 연구동향과 관련기술을 소개하였다. 대부분의 연구는 해수담수화 과정에서 붕소를 제거하는 목적으로 진행되었으며, 붕소의 회수는 주로 폐수나 염수에서 이루어졌다. 용존 붕소를 회수하는 기술은 이온교환법이 대표적이며, 흡착-여과막 공법(Adsorption Membrane Filtration, AMF), 용매추출법 등이 있다. A lot of researches have been carried out on the recovery of resources from the seawater all over the world. The boron concentration in seawater is low about at 4.5ppm, but considering the volume of seawater, the total weight of dissolved boron amounts to about 5.4 trillion tons. The boron is an essential resource in about 300 kinds of industries. Korea has imported all of the boron and spent more than 700 billion won each year. In this article, we introduce the domestic and international research trends and technologies for removing or recovering the boron from wastewater and seawater. Most of the researches have been conducted to remove the boron from the desalination process, and to recover the boron mainly from wastewater and brine. The technique for the recovery of the dissolved boron includes the ion exchange, which is the most representative, the adsorption membrane filtration (AMF), solvent extraction, and so on.
정성수,박충효,강신출,김종욱,임정훈,김명호,박태곤,Jeong, Seong-Su,Park, Choong-Hyo,Kang, Shin-Chul,Kim, Jong-Wook,Lim, Jung-Hoon,Kim, Myong-Ho,Park, Tae-Gone 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.11
A cantilever-type piezoelectric generator has advantages of simple structure, ease of fabrication and large displacement by transverse vibration of a beam. It is easy to control the natural frequency, and also possible to increase the output power by changing the length, width, and thickness of the generator. In particular, the length increases, the natural frequency sharply decreases, and vice versa. Hence, the natural frequency can widely be controlled by using change in the length of elastic body. In this paper, the generator was designed and fabricated to change natural frequency using the slides of the case. In addition, the generating characteristics were confirmed through finite element analyses and vibration experiment. As a result, the maximum output characteristics could be generated due to resonance phenomenon although any frequency of external force was applied.
볼밀링한 WO<sub>3</sub>-CuO 나노복합분말의 조성에 따른 수소환원 거동
정성수,강윤성,이재성,Jung Sung-Soo,Kang Yun-Sung,Lee Jai-Sung 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.3
The effect of Cu content on hydrogen reduction behavior of ball-milled $WO_3$-CuO nanocomposite powders was investigated. Hydrogen reduction behavior and reduction percent(${\alpha}$) of nanopowders were characterized by thermogravimetry (TG) and hygrometry measurements. Activation energy for hydrogen reduction of $WO_3$ nanopowders with different Cu content was calculated at each heating rate and reduction percent(${\alpha}$). The activation energy for reduction of $WO_3$ obtained in this study existed in the ranging from 129 to 139 kJ/mol, which was in accordance with the activation energy for $WO_3$ powder reduction of conventional micron-sized.
조현병 환자의 인지기능 및 심리사회적 요인과 직업재활과의 연관성
김현정(Hyun-jung Kim),김성진(Sung-Jin Kim),공보금(Bo-Geum Kong),강제욱(Je-Wook Kang),문정준(Jung-Joon Moon),전동욱(Dong-Wook Jeon),서영수(Young-Soo Seo),하태민(Tae-Min Ha),정성수(Sung-Soo Jung),정도운(Do-Un Jung) 대한생물치료정신의학회 2014 생물치료정신의학 Vol.20 No.2
Objectives:This study was performed to assess the effect of cognitive function on occupational rehabilitation and to review the clinical and psychosocial factors that may affect occupational rehabilitation in patients with schizophrenia. Methods:A total of 58 patients were enrolled and divided into three groups : group of occupational rehabilitation (n=18), day-care(n=19), and out-patient care(n=21). For the cognitive function assessment, the Korean version of the MATRICS Consensus Cognitive Battery(MCCB) and the Korean version of the UCSD Performance-based Skills Assessment (UPSA) were performed. To assess clinical symptoms, the Positive and Negative Syndrome Scale, the Korean version of the Personal and Social Performance Scale(PSP), and the Clinical Global Impression–Schizophrenia scale(CGISCH) were performed. For the psychosocial factors assessment, the Korean Insight Scale for Psychosis and the Korean Version of 4th Revision of Schizophrenia Quality of Life Scale were performed. Results:On the MCCB, the occupational rehabilitation group showed higher scores than the day-care group in the verbal learning and social cognition domains. On the UPSA, the occupational rehabilitation group showed higher scores than the day-care group in the communication domain. No significant difference was found between the groups in the total scores of these cognitive function tests. On the CGI-SCH and PSP, the occupational rehabilitation group revealed better outcomes than the other groups. Conclusion:The schizophrenia patients with occupational rehabilitation had higher cognitive functions on some subscales, which may reflect social cognitive functions, and higher CGI-SCH and PSP scores.