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주요우울증이 근로자의 생산성에 미치는 영향 : WHO-HPQ(Health and Work Performance Questionnaire)를 이용한 예비연구
김원,황태연,함병주,이준석,최병휘,김세주,서용진,강은호,우종민 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.6
Objectives : Major depressive disorder (MDD) causes patients' distress and makes socioeconomic burden, both directly and indirectly. We used the concept of lost productive time (LPT) to estimate the indirect costs and calculated both absenteeism and presenteeism among workers with MDD. Mcthods : Depression group was recruited from workers visiting psychiatric outpatient clinic who had MDD without major physical or mental disorders (N= 106). Age and sex matched healthy control group was also recruited through advertisement (M=100). All participants completed a interview using WHO Health and Work Performance Questionnaire (HPQ), Job Stress Measurement Scale for Korean Employees, and Hamilton Rating Scale for Depression. Statistical analysis was performed with independent t-test or χ² test as characteristics of values (p=0.05). Results : The number of absence (0.94-day/month vs. 0.10-day/month, P=0.015) andthe numberofearly leaving (2.56-day/month vs. 0.24-day/month, P<0.001) were significantly higher in the depression group. Depression group evaluated their Perfor-mance level much lower than controls with significant value (5.16 vs. 7.62, P<0.001). In addition, depression group estimated their performance level during the last 4 weeks lower compared to the level of past 1-year (5.16 vs 6.63, P<0.001). The estimated costs of absenteeism in depression group were higher than controls by 2,520,000 Korean Won per year, and those of presenteeism were also higher by 4,880,000 Korean Won per year. The total costs of LPT in depression group were higher than controls by 7,400,000 Korean Won, which corresponds to 26% ofmean annual salary. In addition, the level of occupational stress, such as high demand and interpersonal conflict, was higher in the depression group. Conclusion : Major depressive disorder costs substantial productivity loss to workers and their company. Presenteeism imposes more time cost than absenteeism. Effectiveness trials are needed to devise cost-effective programs for the early detection and treatment of depression at the workplace.
Simulation Study on a Prompt Gamma Detection System for Use in Proton Therapy
Byoung Hwi Kang,Jong Won Kim 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
In proton beam therapy, it is important to know the location of the distal dose falloff. The method we adopt is to detect prompt gammas emitted from nuclear reactions in the direction normal to incident protons. While we have successfully measured the falloff locations in the therapy energy range of 100 -- 200 MeV by using a scanning system, a stationary system is needed for practical applications. The new system we are developing consists of a micro-time projection chamber (TPC), which can track the Compton-scattered electrons, and a position-sensitive scintillation detector. The performance of such a system has been studied and optimized using the Monte Carlo simulation toolkits GEANT and GLECS. With coincidence information between the TPC and the scintillation camera, the prompt gammas can be reconstructed with high angular resolution to filter the normal direction. We present the simulation results for the planned system. In proton beam therapy, it is important to know the location of the distal dose falloff. The method we adopt is to detect prompt gammas emitted from nuclear reactions in the direction normal to incident protons. While we have successfully measured the falloff locations in the therapy energy range of 100 -- 200 MeV by using a scanning system, a stationary system is needed for practical applications. The new system we are developing consists of a micro-time projection chamber (TPC), which can track the Compton-scattered electrons, and a position-sensitive scintillation detector. The performance of such a system has been studied and optimized using the Monte Carlo simulation toolkits GEANT and GLECS. With coincidence information between the TPC and the scintillation camera, the prompt gammas can be reconstructed with high angular resolution to filter the normal direction. We present the simulation results for the planned system.
Lee, Byoung Se,Yi, Mihye,Chu, So Young,Lee, Ja Young,Kwon, Hye Rim,Lee, Kyu Reon,Kang, Donghyeon,Kim, Wan Seop,Lim, Heung Bin,Lee, Jouhahn,Youn, Hyung-Joong,Chi, Dae Yoon,Hur, Nam Hwi Royal Society of Chemistry 2010 Chemical communications Vol.46 No.22
<P>Copper nitride nanoparticles supported on a mesoporous superparamagnetic silica microsphere exhibit superior activity toward the Huisgen cycloaddition of azides and alkynes. The nitride catalyst offers significant advantages over homogeneous Cu catalysts.</P> <P>Graphic Abstract</P><P>Cu<SUB>3</SUB>N nanoparticles supported on a superparamagnetic sphere exhibit superior activity toward the cycloaddition of azides and alkynes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c001255f'> </P>
Characteristics of Rare Isotope Beams in the KoRIA Facility
류민상,Byoung Hwi Kang,김용균,정순찬,윤종철 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.1
The Korea Rare Isotope Accelerator (KoRIA) facility plans to provide neutron-rich rare isotopes (RIs) and stable heavy ion beams for research in the fields of basic and applied sciences. In the facility, both the isotope separator on-line (ISOL) and the in-flight fragmentation (IFF) methods are employed for RI production by 238U fission, which is effective for producing neutron-rich RI beams. These ISOL and IFF systems are designed to obtain world-class RI beam intensity, which allows exotic nuclei near the neutron drip line in the nuclear chart, which have not yet been explored, to be studied. In this paper, the uniqueness of the KoRIA facility under consideration, compared to other facilities, is described, and we present the characteristics of the RI beams that will be available at KoRIA. The Korea Rare Isotope Accelerator (KoRIA) facility plans to provide neutron-rich rare isotopes (RIs) and stable heavy ion beams for research in the fields of basic and applied sciences. In the facility, both the isotope separator on-line (ISOL) and the in-flight fragmentation (IFF) methods are employed for RI production by 238U fission, which is effective for producing neutron-rich RI beams. These ISOL and IFF systems are designed to obtain world-class RI beam intensity, which allows exotic nuclei near the neutron drip line in the nuclear chart, which have not yet been explored, to be studied. In this paper, the uniqueness of the KoRIA facility under consideration, compared to other facilities, is described, and we present the characteristics of the RI beams that will be available at KoRIA.