• The KIPS Transactions:PartD
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• v.13D no.1 s.104
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• pp.67-74
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• 2006

The security requirements identification in the software development has received some attention recently. However, previous methods do not provide clear method and process of security requirements identification. We propose a process that software developers can build application specific security requirements from state transition diagrams at the security threat location. The proposed process consists of building model and identifying application specific security requirements. The state transition diagram is constructed through subprocesses i) the identification of security threat locations using security failure data based on the point that attackers exploit software vulnerabilities and attack system assets, ii) the construction of a state transition diagram which is usable to protect, mitigate, and remove vulnerabilities of security threat locations. The identification Process of application specific security requirements consist of i) the analysis of the functional requirements of the software, which are decomposed into a DFD(Data Flow Diagram; the identification of the security threat location; and the appliance of the corresponding state transition diagram into the security threat locations, ii) the construction of the application specific state transition diagram, iii) the construction of security requirements based on the rule of the identification of security requirements. The proposed method is helpful to identify the security requirements easily at an early phase of software development.

• Applied Chemistry for Engineering
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• v.16 no.2
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• pp.231-237
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• 2005

The sizes and structure of micelles and vesicles formed in ammonium dodecyl sulfate (ADS)/octadecyl trimethyl ammonium chloride (OTAC) mixed aqueous solutions were analyzed by small-angle neutron scattering. In micellar regions of pure ADS and OTAC aqueous solution, the spherical micelles were formed at given concentrations and their sizes were 40 and $61{\AA}$, respectively. The structure transition of pure micelles occurred above 300 mM due to the constancy of the intermicellar distance above 250 mM. The coexisting region of mixed micelles and vesicles in phase diagram of mixed system was also assured. It was investigated that vesicle formed spontaneously took a bilayer structure. The lamellar thickness of vesicles decreased with increasing concentration of vesicle samples. However, the size could not be determined for mixed micelle and vesicle above 100 nm due to limitation of low q ranges. Finally, The 9 mM solution of ADS mole fraction 0.9 (${\alpha}$=0.9) showed bilayer structure compared to phase diagram classified into mixed micelle.

• Journal of Intelligence and Information Systems
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• v.13 no.2
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• pp.27-41
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• 2007

Nowadays the context-aware systems have been regarded as a promising opportunity to create differentiated e-marketplaces. Context-aware system aims to provide personalized services by understanding the user's current situation which is automatically acquired from the context data. This aim naturally leads us to a motivation to evaluate to what extent a system is context-aware. Even though lots of endeavors have stated about the level of context-aware system, a structured evaluation has been so far very rare. Hence, the purpose of this paper is to propose a two-phased methodology for assessing context-aware systems. In the first phase, we perform a requisite analysis to discriminate a context-aware system from general or context-based systems. Once an information system is recognized as context-aware system, then level of collaboration, mobility and embeddedness is derived to determine the level of context-aware system in the second phase. To do so, device collaboration diagram (DCD) is proposed to visualize the system architecture. Moreover, readiness and level of system are Jointly considered in the phase to provide a development strategy for each context-aware system development project. To show the feasibility of the idea proposed in this paper, legacy context-aware systems are actually analyzed and evaluated.

• Applied Chemistry for Engineering
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• v.35 no.3
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• pp.214-221
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• 2024

Polyether ketone (PEEK) has been widely used in membranes because of its excellent thermal stability, chemical resistance, and significant mechanical strength. However, the melting temperature is very high, making it difficult to find suitable solvents. Therefore, in this study, PEEK and benzophenone (DPK) were used as diluents to prepare a membrane with excellent mechanical strength and chemical stability using the thermally induced phase separation (TIPS) method to compensate for the shortcomings of PEEK membrane preparation and achieving the highest performances. The optimal membrane manufacturing conditions were confirmed through the crystallization temperature and cloud point according to the polymer content through the phase diagram. Subsequently, the morphological changes of the membrane, influenced by the polymer and diluent content, were confirmed through scanning electron microscopy (SEM). Additionally, the membrane thickness tended to increase with higher polymer content. Tensile strength and DI-water permeability tests were conducted to confirm the mechanical strength and permeability of the membrane. Through the previous characteristic evaluation, it was confirmed that the membrane using PEEK had excellent mechanical strength and permeability.

• Electrical & Electronic Materials
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• v.2 no.1
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• pp.65-75
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• 1989

22종류의 Y-Ba-Cu-O계 세라믹스의 초전도성을 조사하기 위하여 x-선 회절무늬, 전기/저항 및 적외선 투과도를 측정하였다. 또한 시료의 제조 조건에 따른 영향도 조사하였다. 측정결과 3성분게 상도에서 넓은 영역에 걸쳐 초전도성이 나타났으며 특히 상도의 중앙부근의 조성을 갖는 시료들은 실온에서 전기 저항값이 작고 90K이상에서 초전도 전이가 일어남을 알 수 있었다.

• Korea-Australia Rheology Journal
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• v.18 no.2
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• pp.99-102
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• 2006

Primitive chain network model for block copolymers is used here to simulate molecular dynamics in the entangled state with acceptable computational cost. It was found that i) the hooking procedure rearranging the topology of the entangled network is critical for the equilibrium structure of the system, and ii) simulations accounting for the different chemistry, i.e., with a biased hooking probability based on interaction parameter ${\chi}$ for selection of the hooked partner, generates a reasonable phase diagram.

• IE interfaces
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• v.6 no.1
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• pp.47-54
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• 1993

Sequential Numbering System(SNS) is one of the production and inventory management system, which is more effective and practical to minor enterprises than Material Requirement Planning (MRP) system or Just-in-Time(JIT) system. The purpose of the paper is the structured analysis of SNS as the first phase of software development. Data Flow Diagram(DFD), Data Dictionary(DD), and Mini-Specs are used to analyze the system through the second level. The result can be exploited to SNS software design and programming.

• Journal of the Korean Graphic Arts Communication Society
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• v.15 no.2
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• pp.107-115
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• 1997

The ultraviolet(UV)-curable materials are widely used in inks and coatings. In this paper is designed to develop materials having flexibility and functionality with UV-curable acrylate monomer and alkyd resin. At first, phase diagram is prepared for miscibility of UV -curable acrylate monomer with alkyd resin. Also the gel fraction and dynamic viscosity are measured to curing speed of mixing system. In results, it has been demonstrated that miscibility and curing speed are greatly influenced by alkyd resin content.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1996.10a
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• pp.113-116
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• 1996

Firms spend enormous efforts identifying current processes and understanding the related details before establishing new business processes in their business process redesign (BPR) projects. Considering excessive efforts required during the analysis phase and limited support to BPR projects, need for a better method is evident This article describes a method of modeling enterprise business processes bayed on common business forms. By identifying form operations and form field types, the proposed method provides redesign view on the information handling as well as the current process flows in the form of an Event-Process Chain (EPC) diagram.

• Proceedings of the Korean Fiber Society Conference
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• 2001.10a
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• pp.215-218
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• 2001

이산화탄소($CO_2$)를 사용한 셀룰로오스 카보네이트 유도체의 제조 및 재생 셀룰로오스 섬유 제조와 관련한 기초 연구성과를 이미 발표한 바 있다[1~3]. 이번 연구에서는 일정한 조건에서 제조된 셀룰로오스 카보네이트 유도체의 용해온도, 셀룰로오스 카보네이트 함량, 10% 수산화나트륨 수용액내의 산화아연의 함량 변화에 따른 용해성을 평가하여 상그림표를 작성하였다. (중략)