• Bulletin of the Korean Chemical Society
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• v.30 no.5
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• pp.1118-1120
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• 2009

Micro-size CdS spheres of hollow shape were fabricated through the self-assembly of high density arrow-like nanorods. The synthesis of the CdS hollow spheres were accomplished in an aqueous solution of cadmium nitrate and triblock copolymer (Pluronic P123) at low temperature (80 ${^{\circ}C}$) through the slow release of S2- ions from thioacetamide. Morphology of the fabricated CdS hollow spheres was characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). The results indicate that the arrow-like CdS nanorods are simultaneously grown and attached each other to form the building units that become the spheres with hollow inside as a self-assembled process. The CdS spheres have a diameter of $2{\sim}3 {\mu}m$ and consist of the nanorods with a length of$\sim$800 nm. The nanocrystal building blocks have a hexagonal CdS structure.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2005.11b
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• pp.76-85
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• 2005

The conceptual study of Accelerator Driven System (ADS) had lasted for about five years and ended in 1999 in China. As one project of 'the major state basic research program (973)' in energy domain, which is sponsored by the China Ministry of Science and Technology (MOST), a five years program of basic research for ADS physics and related technology has been launched since 2000 and passed national review last month. CIAE (China Institute of Atomic Energy), IHEP (Institute of High Energy Physics), PKU-IHIP (Institute of Heavy Ion Physics in Peking University) and other institutions are jointly carrying on the research. The research activities are focused on HPPA physics and technology, reactor physics of external source driven sub-critical assembly, nuclear data base and material study. For HPPA, a high current injector consisting of an ECR ion source, LEBT and a RFQ accelerating structure of 3.5MeV has been built. In reactor physics study, a series of neutron multiplication experimental study has been carried out and is being carrying on. The VENUS facility has been constructed as the basic experimental platform for the neutronics study in ADS blanket. It's a zero power sub-critical neutron multiplying assembly driven by external neutron produced by a pulsed neutron generator. The theoretical, experimental and simulation study on nuclear data, material properties and nuclear fuel circulation related to ADS is carrying on to provide the database for ADS system analysis. The main results on ADS related researches will be reported.

• Korean Security Journal
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• no.35
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• pp.37-62
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• 2013

One of the organizational characteristics in the modern society is the emphasis placed upon individual autonomy in an effort to promote and develop each member's morale as well as the efficiency in personnel management. Therefore, it can be understood that the importance of "Self" is recognized in work places and the leadership of supervisors and each member's self-management and control are also emphasized, leading to establishment of the "Self-leadership" concept. In this study, the effect of the Transformational Leadership of the supervisors on the subordinates' Self-leadership was analyzed and the causal factor of organizational support in the relationship between Transformational Leadership and Self-leadership was defined. A survey was conducted with 182 security officials at the National Assembly and the following results were obtained. First, Transformational Leadership had a positive effect on Self-leadership and the Transformational Leadership of the supervisors had a statistically significant impact on the organizational support awareness. Furthermore, organizational support showed a statistically significant mediator effect in the relationship between the Transformational Leadership of the supervisors and the Self-leadership of the subordinates. Finally, future directions in regard to the personnel management system were suggested.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.9 no.1
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• pp.45-52
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• 2000

The purpose of this research was developing an integrated way to solve two typical tolerance optimization problem i.e. optimal tolerance allotment and design centering. A new problem definition design centering-tolerance allotment problem (DCTA) was proposed here for the first time and solved. Genetic algorithm and coarse Monte Carlo simulation were used to solve the stochastic optimization problem. Optimal costs were compared with the costs from the previous optimization strategies Significant cost reductions were achieved by DCTA scheme.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2006.11a
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• pp.369-372
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• 2006

Optimal engineering design is challenging because nonlinear objective functions need to be evaluated in a high-dimensional space. This paper presents a data-mining aided optimal design method. The method is employed in designing an optimal multi-station fixture layout. Its benefit is demonstrated by a comparison with currently available optimization methods.

• The Bulletin of The Korean Astronomical Society
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• v.42 no.2
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• pp.37.2-37.2
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• 2017

Since the discovery of quasars about a half century ago, it has been an open question what triggers supermassive black holes at the center of galaxies. I will talk about AGNs and their host galaxies in the context of galaxy assembly and evolution. In particular, I will focus on the fundamental, but unanswered question whether black holes play a key role in galaxy evolution from my personal perspective.

• Bulletin of the Korean Chemical Society
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• v.27 no.11
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• pp.1881-1884
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• 2006

• The Journal of the Society of Korean Medicine Diagnostics
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• v.17 no.1
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• pp.51-62
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• 2013

Objectives This study aimed to analyze and summarize the satisfaction with oriental medical services in korea. Methods From 3 Korean databases (National Assembly Library, Korea Education Research Information Sharing Service, and National Discovery for Science Leaders), published between 2001 and 2011, we were obtained 13 studies that involved the satisfaction of oriental medical services. Results We found that the kindness of doctors and other staffs was significant determinant of satisfaction with oriental medical services. The positive recognition about treatment effect and the preference to combined medical system were also influenced to satisfaction with oriental medical services. Generally it was necessary for evaluation of satisfaction to improve facilities and environments of hospitals. Conclusions The satisfaction with oriental medical services would be related with the kindness of doctors and other staffs, the recognition about treatment effect, the preference to combined medical system and environments of hospitals. Also to confirm the reasons for the satisfaction with oriental medical services, further studies should be conducted using the highest methodological standards.

• The Journal of the Society of Korean Medicine Diagnostics
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• v.16 no.2
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• pp.11-22
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• 2012

Objectives : This study aimed to analyze and summarize the utilization of oriental medical services in korea. Methods : From 3 Korean databases (National Assembly Library, Korea Education Research Information Sharing Service, and National Discovery for Science Leaders), published between 2001 and 2011, we were obtained 17 studies that involved the utilization of oriental medical services. Results : We found that women, elderly patients, and patients with low education levels and those with musculoskeletal and cerebrovascular diseases preferred to use oriental medical services. Other variables such as trust and kindness of staff and positive perceptions of the treatment effect were found to be significant determinants for utilizing oriental medical services. Conclusions : The utilization of oriental medical services would be related with gender, age, education levels and diseases. Also to confirm the reasons for patients to choose oriental medical services, further studies should be conducted using the highest methodological standards.

• Journal of Powder Materials
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• v.16 no.6
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• pp.410-415
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• 2009

Hexagonal barium ferrite ($BaFe_{12}O_{19}$) nano-particles have been successfully synthesised using selfassembly method. Diethyleneamine (DEA) surfactant was used to fabricate the micelle structure of Ba-DEA complex under various DEA concentrations. $BaFe_{12}O_{19}$ powders were synthesized with addition Fe ions to Ba-DEA complex and then heat treated at temperature range of 800-1000${\circ}C$. The molar ratio of Ba/DEA and heat-treatment temperature significantly affected the magnetic properties and morphology of $BaFe_{12}O_{19}$ powders. $BaFe_{12}O_{19}$ powders synthesized with Ba/DEA molar ratio of 1 and heat-treated at 1000${\circ}C$ for 1 hour showed the coercive forces (iHc) of 4.84 kOe with average crystal size of about 200 nm.