• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.22 no.2
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• pp.53-59
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• 1986

On the slamming analysis of ship design the data for the impact pressure acted on the forward bottom of a ship are needed. Furthermore impact pressure is given by the function of both the hull form coefficient and relative velocity. In this papper. a simplified method to estimate hull form coefficient by perso;,al computer (p. c.) is studied. This numerical analysis was applied to the model of the Mariner type. and then the result by the p. c. was compared with that by IBM 7090 computer. Main results obtained are as follows: 1. The result by the developed p. c. method had fairly good agreement with that by conventional large computer (IBM 7090) within 2% error. 2. This developed method' by p. c. may be applied to the initial estimation of the K-value because of the close agreement between the ship lines by the results of p. c. and that of input.

• Journal of Computing Science and Engineering
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• v.1 no.1
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• pp.74-94
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• 2007

Nowadays, sharing data among organizations is often required during the business collaboration. Data mining technology has enabled efficient extraction of knowledge from large databases. This, however, increases risks of disclosing the sensitive knowledge when the database is released to other parties. To address this privacy issue, one may sanitize the original database so that the sensitive knowledge is hidden. The challenge is to minimize the side effect on the quality of the sanitized database so that non-sensitive knowledge can still be mined. In this paper, we study such a problem in the context of hiding sensitive frequent itemsets by judiciously modifying the transactions in the database. Unlike previous work, we consider the quality of the sanitized database especially on preserving the non-sensitive frequent itemsets. To preserve the non-sensitive frequent itemsets, we propose a border-based approach to efficiently evaluate the impact of any modification to the database during the hiding process. The quality of database can be well maintained by greedily selecting the modifications with minimal side effect. Experiments results are also reported to show the effectiveness of the proposed approach.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.38 no.5
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• pp.14-22
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• 2001

This paper presents identification and control designs using neural networks for a class of multivariable nonlinear servomechanisms. A proposed neuro-controller is a combination of linear controllers and a neural network, and is trained by indirect neuro-control scheme. The proposed neuro-controller is implemented and tested on an IBM PC-based two 2 bar systems holding an object, and is applicable to many de-motor-driven precision multivariable nonlinear servomechanisms. The ideas, algorithm, and experimental results arc described. Moreover, experimental results are shown to be superior to those of conventional control.

• 제어로봇시스템학회:학술대회논문집
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• 1989.10a
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• pp.308-312
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• 1989

We developed a model of NC controller with IBM-PC as a host cpu and integlligent NC servo controller for 2 axes that can be expaned to 4 axes. Basic conceptions, including hardware structure design, servo controller design, communication protocol, and interpolation hardware design was already publicated on '87 KIEE conference. Following this, we focussed on the emulation of tyhe controller with X-Y table as complete NC machine experimenting some drawings made by NC code program that can be edited and executed in automatic on single step mode. In addition we designed the M.S.T functions with PLC and tested for M-function timing. Finally, we designed NC interface to fit with M-function output and we contructed total system of NC controller with IBM PC host with the result of successful development of new NC model.

• Computational Structural Engineering
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• v.1 no.2
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• pp.18-25
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• 1988

1981년 여름 대형컴퓨터의 대부로서 군림해온 IBM이 PC를 발표함과 더불어 그들의 기술을 공개함으로써 많은 회사들이 IBM PC 호환기종을 개발, 생산할 수 있었고 특히 표준 OS인 MS-DOS와 더불어 PC의 표준화를 유도함으로써 많은 주변기기 및 소프트웨어 등장이 가능했고 최근에는 반도체의 급속한 기술발달로 고집적 메모리의 값싼 공급과 16비트 및 32비트 마이크로프로세서의 등장으로 PC도 그 기능이 점차 확대되어 개인 오락기나 간단한 OA차원을 벗어나 이제는 엔지니어링 분야에까지 그 영역을 넓혀가고 있다. 그러나 아직 국내에 보급된 PC로는 3차원 구조계산과 같은 복잡한 엔지니어링 업무를 수행하기에는 많은 제약조건이 있으나 80386의 보급이 확대되고 80486의 발표가 눈앞에 와 있는 싯점에 PC의 성능은 놀라울 정도로 향상될 것이고 엔지니어링 분야에도 크게 기여할 것으로 믿는다. PC를 이루는 많은 하드웨어 중에서 엔지니어링 분야 이용자에게 특히 필요한 부분을 먼저 간단히 소개하고 다음에 이의 활용을 소개함으로써 엔지니어링 분야의 프로그램 개발자나 이용자가 보다 능동적으로 PC를 선정하고 나아가 기능확대, 성능향상을 꾀하는데 도움을 주고자 한다.

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2003.11a
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• pp.88-93
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• 2003

무전해 Ni-P와 Sn의 반응 및 Ni-P의 결정화에 대한 P 함량의 영향을 세 가지 다른 조성의 Ni-P (P 4.6, 9, 13 $wt.\%$)를 이용하여 연구하였다. $300^{\circ}C$까지 열처리한 모든 시편에서 $Ni_3Sn_4$ intermetallic compound (IMC)가 생성되었고 이들 시편을 $450^{\circ}C$까지 열처리한 경우 Sn 두께가 $0.5{\mu}m$로 작을 때 $Ni_3Sn_4$가 모두 $Ni_3Sn_2$로 변화하였다. nanocrystal인 Ni-4.6P는 Ni (111) texture를 유지하며 결정화되었고 Sn과의 반응시 형성되는 $Ni_3Sn_4$ IMC 또한 비정질인 Ni-9P, Ni-13P 경우보다 강한 (111) texture를 가짐이 확인되었다. Ni-P 막의 P 함량이 작은 경우 $Ni_3Sn_4$ IMC는 두껍고 조밀하게 형성되는 반면 P-rich layer 두께는 작아졌다.

• Journal of Korean Library and Information Science Society
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• v.29
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• pp.213-239
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• 1998

The purpose of this study is to provide more effective utilization of Internet patent information databases and to help develop an user-friendly interface design. Search functions, level of user-friendliness and user-suport have been closely analyzed, using USPTO, QPAT-US, IBM as well as the relatively well-known domestically-developed Patrom. The factors used in this quality evaluation are those resulting from the combination of CD-ROM databases and traditional databases. The followings are the results. Patrom most effectively utilizes the characteristics of databases. USPTO provides the most adequate Interface for a novice user. QPAT-US employs various auxilary services while IBM uses an assortment of search methods and images. In addition, it is expected that the findings will contribute to the development of user-friendly interface databases.

• Journal of the military operations research society of Korea
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• v.3 no.1
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• pp.51-82
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• 1977

Decision making is a function of many variables, but among these, human burden (soft-ware) and machine burden (hard-ware) are critical. Decision Maker is rather concerned with the soft-ware and just wants to have machine calculate the quantitative arithmetic involved in the decision-making study, because he is responsible for that decision whether or not he knows details about the techniques used by his staffs. From the point of these considerations, computer-assisted war game model has its significance in military decision making. The major outcome of this model is time-phased FEBA movement. FEBA is moved mainly by the ratio of the Index of Combat Effectiveness (ICE). To calculate ICE, Ground Forces are concerning the Index of Firepower (IFP) of individual weapons and in the case of Air Force, sorties are allocated into each sector, and added to the Ground Force IFP. With the ratio of total ICE, FEBA is moved according to the War Game Tables and process is repeated after consideration of casualties. This model is used by IBM-370/135 in MND computer room and also tested by IBM-3741/3717 established at ROKA HQ.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.141-144
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• 2005

J2EE 환경 기반의 IBM DB2 for z/OS 데이터 베이스를 적용한 어플리케이션에서 성능이 상대적으로 저하되는 문제가 발생 하였다. 즉, J2EE (Java 2, Enterprise Edition) 환경에서 동일한 어플리케이션을 Unix 서버의 오라클 데이터 베이스와 IBM DB2에 적용하여 비교한 결과 DB2부문에 대한 TPS가 작고 Transaction Elapsed Time이 오래 걸리며 CPU Utilization이 낮았다. 이러한 초기 결과값을 Baseline으로 설정하여 DB2를 데이터 베이스 서버로 사용하는 경우 어플리케이션의 성능을 개선 하기 위한 요소를 도출하고 성능 향상을 위한 조정 작업을 통해 DB2의 성능을 개선했다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.83-85
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• 2000

최근접 질의(nearest neighbor query)는 멀티미디어 데이터베이스에서 주어진 질의 객체와 가장 유사한 객체를 찾기 위한 매우 중요한 연산으로 사용된다. 대부분의 최근접 질의 처리 기법들은 객체의 효과적인 인덱싱을 위하여 다차원 인덱스(multidimensional index)를 사용한다. 그러나 N차원 시각형 혹은 원을 사용하여 객체 클러스터의 캡슐을 표현하는 기존의 다차원 인덱스들은 차원 수가 높아짐에 따라 검색 성능이 크게 떨어진다. 본 논문에서는 이러한 문제를 해결하는 새로운 인덱스 구조를 제시하고, 이를 이용하는 최근접 질의 처리 방안을 제안한다. 또한, 다양한 실험에 의한 성능 평가를 통하여 제안된 기법의 우수성을 검증한다.