• Proceedings of the Korean Society of Computer Information Conference
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• 2008.06a
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• pp.297-300
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• 2008

임베디드 시스템을 지원하는 JAVA API를 개발하면 임베디드 시스템을 개발자가 JAVA를 사용하므로써 코드의 재사용, 객체지향 개념의 시스템 개발들을 가능하게 한다. JAVA API를 구현하는데 있어 시스템에 의존적인 부분들이 존재하게 되는데, 이는 native 함수에서 구현한다. 본 논문에서는 리눅스 기반의 임베디드 시스템 디바이스를 제어하기 위한 JAVA API를 구현하는데 있어 플랫폼 독립적인 자바 부분과 의존적인 native 부분으로 나누어 설계 및 구현하였고, 임베디스 시스템 디바이스의 JAVA API를 통한 제어에 초점을 두었다.

• Annual Conference of KIPS
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• 2007.11a
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• pp.411-414
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• 2007

본 연구에서는 CBD 기반의 RUP 모델을 이용하여 재 사용이 가능한 컴포넌트들을 설계하였으며, 이를 이용하여 연구관리 시스템을 구현하였다. 이를 위하여 연구관리 시스템의 주요 사용자 인터페이스인 등록관리 및 변경관리를 위한 컴포넌트를 구성하였으며, 구성된 컴포넌트들은 관련 SW개발에 효율적으로 재 사용될 수 있을 것으로 생각된다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.2A
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• pp.95-104
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• 2010

In wireless communication system, a variety of retransmission algorithms are used in order to improve the quality of service of users. But the system may be inefficient because retransmission algorithms operate independently with other layers. Also, the quality of service can be degraded due to the unnecessary retransmission of packets. To solve these problems, the study on the cross-layer retransmission schemes have been widely performed. However, in order to apply cross-layer retransmission schemes to wireless communication system, whether the performance of cross-layer retransmission schemes meets QoS requirements of each service class has to be verified. Thus, this paper proposes the mathematical model for analyzing the performance of the cross-layer retransmission schemes and derives both the suitable retransmission scheme and the optimal retransmission parameter on each service class. The proposed mathematical model selects the MCS level based on channel state information and The performance analysis is comparatively easy in case that HARQ, ARQ, and AMC schemes are combined. The proposed mathematical model also enables the analysis of the packet transmission delay. To utilize the analytical model, this paper derives the suitable retransmission scheme and the optimal retransmission parameter for delay sensitive services in WiMAX system. Also, the proposed analytical model can be used to analyze the performance of wireless communication system such as LTE and WLAN.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.501-504
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• 2003

본 논문은 인터넷이 가능한 정보 단말들이 임의의 인터넷 서브 네트워크(Subnet Network)에서 별도의 추가 설정 없이 바로 인터넷을 사용 가능하도록 하기 위한 방법에 관한 것이다. 특히 DNS(Domain Name System) 서버가 없는 네트워크에서도 외부에 존재하는 DNS 서버 주소를 자동으로 찾기 위한 방법에 대해 알아보고자 한다.

• Journal of the Korea Institute of Building Construction
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• v.16 no.6
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• pp.571-578
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• 2016

Recently, review on viability of various industrial by product and natural materials as raw material for concrete has been actively done in aspect of environment-friendly issue and depletion of natural resource. This study conducted fundamental study on the possibility of utilizing mud flat as admixture and filling material for concrete. First, chemical analysis on the viability of mud flat as admixture was done and the researchers compared it with the substance of fly ash and blast furnace slag. According to the result, substance content was proven to be inadequate. In addition, as the replacement rate of mud flat increased, compressive strength and tensile strength decreased. According to the estimated result of chemical substance analysis, possibility of utilizing mud flat as admixture was low. According to the result of experiment done as filling material, 10% ~ 30% replacement rate of mud flat manifested more than 8 Mpa of compressive strength of block which may be utilized for secondary product. However, additional experiment such as making block is required afterward. According to the result of flow experiment, as the replacement rate of mud flat increased, flow value decreased, and through chloride content analysis test, it was proven that mud flat is inappropriate to be applied as steel beam using structure since it has high content of sodium. It may be utilized as products that does not use steel beam such as internal brick.

• The Transactions of the Korea Information Processing Society
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• v.7 no.9
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• pp.2836-2845
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• 2000

UML is used for standardized design, but it has a problem to reuse classified and standardize design information to reuse existing design information. In this paper, the plan to solve these problems design the HYREPnIYbrid REPository) using pattemize design information, and to express together specific property of standardized design information and non standardized design information. It save standardized design information in public area, and non design information in private area. And to express saved design information in repository, UML 1.3 of OMG is used and explained the relationship of the object. Therefore, we designed hybrid repository to express standardized design information and non standardized design information using inheritance concept to remove over adding of pattemized design information.

• The Transactions of the Korea Information Processing Society
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• v.5 no.5
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• pp.1216-1224
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• 1998

In the object oriented methods, most of the objects are independent from the another. However to get their job done from the system's point of view, they must have some kind of connection established among them. This means that the cooperation among the objects through the interaction is just as important as the static side of the objects. Usually, checking for correctness, compatibility and reasoning of the objects is limited due to the fact that the interactions between the objects are expressed in the form of a line or a box. The reuse experts often claim that the design reuse is more important than code reuse, mostly because it can be applied in more contexts and so is more common. The composition of the objects is also considered as a very important definition in the area of framework which is generally known as a technique to support reuse at both the coding and the designing level. Therefore on this thesis, the composition of such objects has been studied to provide a formal means of evaluating the component's compatibility and better possibility for further improvement in the area of framework, by formalizing the component compositions using the LOTOS.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.84-87
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• 2009

본 연구는 건축용 바닥재로 널리 이용되는 PVC 상재의 표면을 열에 의한 손상으로부터 보호하기 위하여 기존에 사용하는 광경화형 우레탄-아크릴 수지에 내열성(anti-cigar burning)을 향상시킨 광경화형 수성도료 개발에 관한 것이다. PVC 바닥상재용으로 사용되는 내열기능성이 없는 우레탄-아크릴 수지에 인계화합물을 주원료로 합성한 내열재, 구아니딘을 주원료로 합성한 내열재, 일시적 방염제로 사용되는 제 2인산암모늄을 수지의 양 대비 함량(wt%)을 10, 20, 30%로 변화하여 첨가한 후 배합하여 수지의 내열성을 향상시킨 코팅액을 제조하였다. 제조한 코팅액은 코팅층의 두께조절이 가능한 Bar-coating을 사용하여 PVC 바닥상재에 코팅한 후, 내열성, 부착력, 내화학성, 코팅두께 등의 코팅층 표면물성을 평가하였다. 연구결과, 수지에 인계화합물을 주원료로 합성한 내열재 30%를 혼합하여 제조한 코팅액을 Bar-coater No.12로 코팅한 코팅표면이 열에 의한 손상이 가장 적고, 부착력 100%, 내화학성 양호로 가장 좋은 물성을 보였다. 전반적으로 내열재 함량이 높고 코팅 두께가 두꺼울수록 내열성이 우수한 것으로 나타났다.

• The Journal of Korean Association of Computer Education
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• v.5 no.1
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• pp.99-108
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• 2002

As window programming and internet programming are more required, requirement of the training on the object-oriented programming and the object oriented software development are growing. But, it is not easy to learn new brand methodologies or techniques. In this paper, we tried to apply software reuse to object modeling education for effective learning of new programming and modeling method. In this paper, we present analogical matching techniques for the reuse of object models and patterns in object modeling education. Analogy-based matching is better than keyword-based retrieval for model reuse. Reuse can help to reduce the learning curve of object modeling. Also, by applying analogical reasoning, the performance of retrieval is better than keyword-based retrieval.

• Journal of Korea Society of Industrial Information Systems
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• v.24 no.5
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• pp.53-64
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• 2019

The term 're-use' here signifies the re-use of end-of-life products without changing their form after they have been thoroughly inspected and cleaned. In the re-use network model, the distributor determines the product order quantity on the network through which new products are received from the suppliers or products are supplied to the customers through re-use of the recovered products. In this paper, we propose a reusable network model for reusable products that considers the total logistics cost from the forward logistics to the reverse logistics. We also propose a reusable network model that considers the processing and disposal costs for reuse in an optimal inventory management environment. The authors employe Genetic Algorithm (GA), which is one of the optimization techniques, to verify the validity of the proposed model. And in order to investigate the effect of the parameters on the solution, the priority-based GA (priGA) under three different parameters and the modified Hybrid GA (mhGA), in which parameters are adjusted for each generation, were applied to four examples with varying sizes in the simulation.