• Bulletin of the Korean Chemical Society
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• v.23 no.8
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• pp.1085-1088
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• 2002

Calix[6]arene having both carboxylic acid (1,3,5-) and carboxamide (2,4,6-) in an alternative way was synthesized. Transport rates of alkali and alkaline-earth metal ions were tested in bulk liquid membrane and polymer inclusion membrane. Ba2+ ion was found to give the highest transport rate among tested metal ions in both BLM and PIM systems. In PIM system, high durability (longer than 30 days) of the membrane was observed.

• Annual Conference of KIPS
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• 2003.05c
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• pp.1845-1848
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• 2003

MDA(The Model Driven Architecture)는 모델을 기반으로 시스템을 개발하는 방법이다. 현재 MDA에서 제안하는 대표적인 모델링은 PIM, PSM으로 두 종류의 모델링 영역이 필요하지만, 적용 플랫폼에 따라 다양한 PSM이 필요하므로 모델링 영역이 확장된다. 또 MDA가 발전하면서 PIM과 PSM이 상대적인 개념임을 인식하면서 모델링 영역은 더욱 더 늘어날 예정이다. 다양한 모델은 다이어 그램으로 표현되고 이를 지원하기 위해 메타 편집 기능이 필요하다. 본 논문에서는 MBA 환경에 필요한 다양한 모델을 표현하기 위해 다이어그램을 생성하는 방법을 기술한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10b
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• pp.307-309
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• 2003

모델을 중심으로 하는 MDA 개발 환경에서는 많은 모델링이 필요하다. 기본적으로 MDA의 기본 단계인 CIM, PIM, PSM 단계의 모델링이 필요하며, 각 단계에서 추상화 수준, 뷰포인트 등에 따라 다양한 다이어그램이 필요하다. 현재 MDA 의 PIM과 PSM 을 상대적인 개념으로 인식하기 때문에 MDA의 단계는 더욱 확대될 것이다. 본 논문에서는 분산 환경에서 컴포넌트 기반 엔터프라이즈 시스템을 개발하기 위한 EDOC 프로파일을 중심으로 MOF 기반 모델링을 수행하는 방법과 프로토타입을 기술한다. OMG 의 제안한 메타모델 표준인 MOF를 이용하므로 JMI, MOF XMI, MOF IDL 매핑을 이용할 수 있는 장점을 갖게 된다.

• Annual Conference of KIPS
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• 2008.11a
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• pp.480-483
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• 2008

OMG 가 시작한 MDA(Model Driven Architecture) 는 소프트웨어 개발자들사이에 빠르게 전파되고 있다. UML 은 OMG 에 의해 MDA 를 위한 언어로 선택되었는데, UML 은 PIM(Platform Independent Model)에서 PSM(Platform Specific Model)을 생성하기에는 충분하지 않다. 하지만, 이러한 PIM-PSM 변환을 가능한한 자동화할수 있는데 이 논문은 자동 코드 생성을 위해 UML 의 확장 방법인 Stereotype 과 Tagged-Value 에 대해 논하게 된다. 또한, Aspect-Oriented 접근을 위해서 AOP 로 확장된 UML 에서 비 AOP 언어로 코드 생성이 가능하게 되는 새로운 방법도 제안을 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.7
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• pp.4536-4544
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• 2014

This paper proposes a development tool to efficiently develop node software for various operating system platforms in a sensor network. The proposed tool consisted of several modules, such as writing graphical model diagram, PIM and PSM design, code generation, and deployment file generation. Through the proposed tool, the users can graphically draw a sensor network model and design the PIM and PSM of the node software by setting the values of the predefined attributes. The source code of the node software is generated automatically from the PSM using the code templates of the target platform. The deployment files for installing node software on each node are generated automatically. The proposed tool helps the users to develop node software easily for a range of target platforms, even though they do not have details of the low-level information for a sensor network.

• Journal of The Korean Society of Agricultural Engineers
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• v.53 no.3
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• pp.13-17
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• 2011

There was a transition from participatory irrigation management (PIM) to public irrigation management (PubIM) in Korea when Korea Rural corporation and Community (KRC) merged with Farm Land Improvement Associations (FLIAs), which had managed 60 % of irrigation areas. While making a number of achievements, some problems occurred in the public irrigation management, such as lack of farmers' participation, increased amount of water usage, and elevating operating costs. Accordingly, this paper suggested ways to increase efficiency in water usage and reduce operating costs under the public management through the motive power of farmers participation. First, WUGs replaced the discarded water management committee should be reorganized to revive the concept of PIM in the form of autonomously reinforced one and the roles and functions of WUGs and the board of representatives should be strengthened. The member of new type of WUGs should participate in the national and regional water management committees as a stakeholder of irrigation water user. And also new type of WUGs initiates not only the management of irrigation water but also the management of irrigation water quality and non-point source pollution in the watersheds. Those additional activities of WUGs should be properly compensated. Second, subsidies (direct payments) should be provided to faithful farmers as an incentive for their labor supply. Third, water fees could be charged to large scale agriculture companies. Fourth, professional managers could be hired, management targets would be adjusted, and incentives should be offered. These efforts are expected to improve the irrigation management by encouraging farmers' participation under public system.

• Journal of the Korea Computer Industry Society
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• v.3 no.9
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• pp.1235-1244
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• 2002

This paper proposes a group key management protocol for a secure of all the multicast user in PIM-SM multicast group communication. With prosed architect, subgroups for multicast secure group management will be divided by RP (Rendezvous-Point) unit and each RP has a subgroup manager. Each subgroup manager gives a secure key to it's own transmitter md the transmitter compress the data with it's own secure key from the subgroup manager. Before the transmitter send the data to receiver, the transmitter prepare to encrypt a user's service by sending a encryption key to the receiver though the secure channel, after choking the user's validity through the secure channel. As the transmitter sending a data after then, the architecture is designed that the receiver will decode the received data with the transmitter's group key. As a result, the transmitting time is shortened because there is no need to data translation by group key on data sending and the data transmition is possible without new key distribution at path change to SPT (Shortest Path Tree) of the router characteristic. Additionally, the whole architecture size is samller than the other multicast secure architecture by using the conventional PIM-SIM routing structure without any additional equipment.

• Journal of the Korea Society of Computer and Information
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• v.6 no.2
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• pp.116-122
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• 2001

A conventional multicast secure protocol. MVMRP, CBT is designed for a large scaled r protocol so the PIM-SM (protect Independent Multicst-Sparse Mode) routing protocol which small number of clients, long distance path among the hosts and shortest path routing chara weak point of require it's own Core tree and re-keying when the traffic is pass through the ro In this study, proposes a architect for a licit information secure of join/leave to all the user or on-service user. With proposed architect, subgroups for multicast secure group mana will be divided by RP (Rendezvous-Point) unit and each RP has a subgroup manager. As a result, the transmitting time is shortened because there is no need to data translation by group key on data sending and the whole architecture size is samller than the other multicast secure architecture.

• Journal of the Korea Society of Computer and Information
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• v.9 no.3
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• pp.177-182
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• 2004

The existing group key management architectures applied to a small scale routing protocols may have many overheads with key distribution. Therefore this paper proposes a group key management protocol in PIM-SM multicast group communication. This method divide multicast groups with RP, and subgroup key managers are established in each RP and can be transmitted groups keys. And this does not have needs of the data translation and the new key distribution for path change. This does not have needs of the data translation and the new key distribution for path change, so the data transmission time can be reduced.

• Journal of Powder Materials
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• v.16 no.5
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• pp.342-350
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• 2009

Development of nanoparticulate materials technology is essential to processing of highly functional nanoparticulate materials and components with small and complex shape. In this paper, the effect of particle size on surface roughness and shrinkage of sintered Fe-8 wt%Ni nanopowder components fabricated by PIM were investigated. The Fe-8 wt%Ni nanopowder was prepared by hydrogen reduction of ball-milled Fe$_2$O$_3$-NiO powder. Feedstock of nanopowder prepared with the wet-milled powder was injection molded into double gear shaped part at 120$^{\circ}C$. After sintering, the sintered part showed near full densified microstructure having apparently no porosity (98%T.D.). Surface roughness of sintered bulk using nanopowder was less than 815 nm and it was about seven times lower than 7 $\mu$m that is typically obtainable from a sintered part produced from PIM.