• Journal of KIISE:Computing Practices and Letters
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• v.5 no.6
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• pp.708-718
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• 1999

본 논문에서 제안하는 시스템은 일반적인 병렬 시스템의 하드웨어 구조에서, 다중 스레드 계산 모델을 이용하여 객체 지향 프로그래밍 환경을 구현한 시스템이다. 제안하는 시스템을 효과적으로 구현하기 위하여 컴파일러와 실행 시간 시스템의 측면에서 여러 가지 기법을 제시한다. 컴파일러의 측면에서는 멤버 변수의 접근 분석, 메소드의 병렬성 분석 기법을 제시하고, 실행 시간 시스템에서는 실시간 스레드/메시지 결합, 프레임 공유 기법을 제시한다. 본 논문에서 제안된 프로그래밍 환경은, MPI 메시지 인터페이스를 이용하여 구현하였으며, 벤치마크 프로그램을 실행함으로써 성능 분석을 하였다. 분석의 결과는 실행시간 시스템의 여러 가지 기법들이 성능 향상에 많은 효과가 있음을 보여주며, 이러한 결과는 일반적인 병렬 시스템에서도 적용 가능하다.Abstract In this paper, we suggest an object-oriented programming environment with multithreaded computation model on general parallel processing systems. We developed many methods for our environment to be efficient : in compiler, the analysis of member variable and method parallelism, and in runtime system, thread/message merging and frame sharing. The programming environment is implemented with MPI message interface, and its performance is analyzed with executing benchmark programs. The results show that the developed methods have influence on performance improvement, and this improvement can be applied to general parallel processing systems.

• Proceedings of the Korea Technology Innovation Society Conference
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• 1998.05a
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• pp.6-6
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• 1998

다가오는 21세기를 대비하여 많은 나라들이 정보와 지식을 확보함으로써 국제적 경쟁력을 갖추기 위해 노력하고 있다. 특히 지식의 공급원천인 기초과학에 대해서는 그 본질을 훼손하지 않으면서 기초과학을 국가경쟁력 강화에 어떻게 연계시키느냐에 초점을 맞추어 정책을 수립하고 있다. 21세기를 앞둔 지금 우리의 바람직한 기초과학정책의 방향은 우리의 현실을 바탕으로 한 실용적이면서, 기초과학이 지니는 특성을 충분히 감안한 것이어야 한다. 따라서 21세기 우리의 기초과학정책이 추구해야 할 목표를 다음과 같이 3가지로 설정하고자 한다. 첫째 지식의 증진, 둘째 과학기술인력의 양성, 셋째 경제성장과 삶의 질 향상에 기여이다. 이 세 가지 목표는 상호 독립적으로 존재할 수 없으며 상호 밀접하게 연계되어야 한다. 이 세 가지 목표를 달성하기 위한 추진전략은 다음과 같다. (ⅰ) 기초과학에 대한 지속적인 정부지원의 강화 : 기초과학에 대한 지원은 정부가 중추적인 역할을 담당해야 하며, 창의적 연구와 학제간 연구에 대한 지원을 강화하여야 한다. (ⅱ) 연구와 교육의 연계를 통한 과학기술인력의 양성에 기여 : 창의적이고 수준 높은 연구를 통해 훌륭한 과학기술인력이 양성되어야 한다. 지식기반경제 하에서 훌륭한 과학기술인력은 미래의 우리 나라의 성공을 좌우하는 요소가 될 것이다. (ⅲ) 국제적 연계의 강화 : 우리 나라의 SCI 점유율은 1%에 불과하다. 국제적 과학기술연계를 통하여 세계의 과학기술지식에 접근하고 협력의 이익을 얻을 수 있어야 한다. (ⅳ) 프로그램 위주의 지원방식과 분야별 지원방식의 병행 추진 : 기초과학에 사용될 수 있는 자원은 한정되어 있으므로 해당 분야의 특성과 경제 사회적 요구를 감안하여 분야별 우선 지원을 병행하여야 한다. 분야별 우선 지원을 위해서는 분야별 전망보고서가 작성되어야 한다. 그러나 분야별 우선 지원 분야의 도출 및 이의지원은 창의적 연구에 대한 보완적 개념으로 이루어져야 한다. 선진국의 경우에도 우선 지원분야에 대한 연구비 배분은 5-10%사이이다. (ⅴ) 성과관리를 통한 지원효과의 극대화 : 기초과학의 지원에 있어서 그 성과를 특정한다는 것은 쉬운 일이 아니지만 연구비 지원효과를 극대화하기 위해서는 프로그램 평가를 통해 성과관리를 하여야 한다. (ⅵ) 효율적인 혁신시스템의 구축 : 혁신시스템의 효율적인 운영이 매우 중요하다. 이를 위해서는 첫째, 연구부문과 산업부문을 연결시킬 수 있고, 새로운 분야를 담아낼 수 있는 유연한 분야분류체계를 정립하여야 하고, 둘째 연구결과의 효율적인 활용이 이루어져야 하며, 셋째 연구지원기관간 연계시스템의 구축을 구축하여야 한다.

• Journal of Korea Multimedia Society
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• v.13 no.7
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• pp.960-972
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• 2010

In this paper, we present a software for placing instruments on stage based on the acoustic properties of the concert hall. In order to simulate the changes in sound depending on the positions of the instruments, we incorporated the idea of location-based reverberation effect which can be realized through the convolution of instrument sounds with the impulse responses from the respective instrument positions. And we developed a software with a real-time convolution engine which enables the user to conveniently simulate the resulting sound of various instrument placements. The software was tested with the impulse response data measured at two concert halls of the National Center for Korean Traditional Performing Arts and Korean traditional instrument sounds. Results of these experiments show that simulated reverberation effects properly represent the spatial placement of instruments on stage.

• Journal of the Korea Convergence Society
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• v.12 no.2
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• pp.327-336
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• 2021

It is important to prevent progression of mild cognitive impairment (MCI) to Alzheimer's disease or other dementia. This study was conducted to investigate cognitive-based intervention and its effectiveness for the older patients with MCI through systematic review. Data search was conducted in September 2020, using the Korea Research Information Service (Riss) and KoreaMed. After selection of literatures according to the predefined inclusion criteria, a total of 12 articles were included. It is revealed that the cognitive-based intervention for the older adults with MCI was found to have a positive effect on the various factors including cognitive function, depression, physical health status, quality of life, and communication. However, it is difficult to draw a definite conclusion due to the various intervention strategies and instruments used. Thus, based on the results of this study, we suggest more studies to verify the effectiveness of such programs.

• Journal of Korean Academy of Nursing
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• v.51 no.3
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• pp.265-279
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• 2021

Purpose: This study examined the impact of a drinking reduction program on drinking motivation, drinking refusal self-efficacy, and problematic drinking behaviors in college students with problematic drinking habits. Methods: This study incorporated a non-equivalent control group prepost-test design. Study participants included 58 college students who scored 12 or more in the AUDIT-K test (Alcohol Use Disorders Identification Test-Korean version) (experimental group: 30; control group: 28). The intervention consisted of eight sessions and was conducted once a week. It was designed to promote autonomy, competence, and relatedness-the three elements of basic psychological needs in self-determination theory. The participants were assessed before the intervention, immediately after, and four weeks post intervention. Data were collected from October 12 to December 31, 2017. The analysis employed the chi-square test, Fisher's exact test, independent t-test, and repeated measures ANOVA using SPSS/WIN 22.0. Results: The mean age of participants was 21.8 years. There were 30 men (51.7%) and 28 women (48.3%). The differences in drinking motivation, drinking refusal self-efficacy, and problematic drinking behaviors were statistically significant for the group by time interaction (F = 42.56, p < .001; F = 54.96, p < .001; F = 39.90, p < .001, respectively). Conclusion: The findings indicate that the intervention effectively decreases drinking motivation, increases drinking refusal self-efficacy, and decreases problematic drinking behaviors. It can be an efficient strategy for college students with problematic drinking habits to enhance their self-determination ability.

• Journal of The Korean Association of Information Education
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• v.2 no.2
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• pp.260-268
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• 1998

In this paper, I propose a metric model for measuring complexity of Web documentations which are wrote by HTML and XML. The complexity of Web documentation has effect on documentation understandability which is an important metric in maintenance and reusing of Web documentation. The understandable documents have more effect on WEI. The proposed metric uses the entropy to represent the degree of information flows between Web documentations. The proposed documentation complexity measures the information flows in a Web document based on the information passing relationship between Web document files. I evaluate the proposed metric by using the complexity properties proposed by Weyuker, and measure the document complexity. I show effectiveness of analyzing the correlation between the number of document file and document complexity.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.31 no.3
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• pp.50-57
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• 2003

In the paper, the design and evaluation of a helicopter trajectory tracking controller are presented. The control algorithm is implemented using the feedback linearization technique and the two time-scale separation architecture. In addition, and on-line adaptive architecture that employs a neural network compensating the model inversion error caused by the deficiency of full knowledge of helicopter dynamic is applied to augment the attitude control system. Trajectory tracking performance of the control system in evaluated using modified TMAN simulation program representing as Apache helicopter. It is show that the on-line neural network in an adaptive control architecture is very effective in dealing with the performance depreciation problem of the trajectory tracking control caused by insufficient information of dynamics.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.12
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• pp.6403-6412
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• 2013

This study examined the intention to use a nursing process application on a smart phone by nursing students who undertake clinical practices, and evaluated the application effect of this program. As research subjects, the study assessed juniors in the college of nursing in Daegu, who had undertaken field training in adult nursing in surgical wards from September 2012 to September 2013. The results showed that the intention to use nursing process application has a significant relationship with effort expectancy, social influence, and self-efficacy. In addition, the nursing process application applied to the research subjects has the largest list of diagnoses, interventions and outcomes regarding acute pain. In addition, the satisfaction with the use of the program was 4.35 points. Through this study, the application of the nursing process presents more opportunities for its use and training in the clinical practice field, and measures that can be applied easily regarding its utilization should be provided.

• Journal of KIISE:Databases
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• v.34 no.5
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• pp.389-395
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• 2007

Collaborative filtering is a popular technique for information filtering to reduce information overload and widely used in application such as recommender system in the E-commerce domain. Collaborative filtering systems collect human ratings and provide Predictions based on the ratings of other people who share the same tastes. The quality of predictions depends on the number of items which are commonly rated by people. Therefore, it is difficult to apply pure collaborative filtering algorithm directly to dynamic collections where items are constantly added or removed. In this paper we suggest a method for managing dynamic collections. It creates taste space for items using a technique called Singular Vector Decomposition (SVD) and maintains clusters of core items on the space to estimate relevance of past and future items. To evaluate the proposed method, we divide database of user ratings into those of old and new items and analyze predicted ratings of the latter. And we experimentally show our method is efficiently applied to dynamic collections.

• Journal of Korean Tunnelling and Underground Space Association
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• v.21 no.1
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• pp.61-77
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• 2019

If a new utility tunnel is planned for high density existing urban areas in Korea, a rational decision-making process such as the determination of optimum design capacity by using the feasibility evaluation system based on quantitative evaluation indexes and the economic evaluation is needed. Thus, the previous study presented the important weight of individual higher-level indexes (3 items) and sub-indexes (16 items) through a hierarchy analysis (AHP) for quantitative evaluation index items, considering the characteristics of each urban type. In addition, an economic evaluation method was proposed considering 10 benefit items and 8 cost items by adding 3 new items, including the effects of traffic accidents, noise reduction and socio-economic losses, to the existing items for the benefit cost analysis suitable for urban utility tunnels. This study presented a quantitative feasibility evaluation method using the important weight of 16 sub-index items such as the road management sector, public facilities sector and urban environment sector. Afterwards, the results of quantitative feasibility and economic evaluation were compared and analyzed in 123 main road sections of the Seoul. In addition, a comprehensive evaluation method was proposed by the combination of the two evaluation results. The design capacity optimization program, which will be developed by programming the logic of the quantitative feasibility and economic evaluation system presented in this study, will be utilized in the planning and design phases of urban community zones and will ultimately contribute to the vitalization of urban utility tunnels.