Earticle

본 연구는 발표 불안 감소 프로그램을 구성하는 개별 요인의 효과를 메타 분석하였 다. 이를 위해 1994년부터 2023년까지 국내에서 출간된 연구물 중 총 117편(k = 389, N = 11,355)을 대상으로 요인별 평균 효과 크기를 산출하였다. 프로그램 구성 요인(독 립 변인)은 정의적 방법, 인지적 방법, 행동적 방법, 문화참여 방법으로, 그리고 효과 변 인(종속변인)은 발표 불안, 자기 효능감, 발표역량, 긍정적 그리고 부정적 사고로 나누 었다. 발표 불안 감소 프로그램의 효과는 발표 불안 감소, 자기 효능감과 발표역량의 향 상, 긍정적 사고의 제고, 그리고 부정적 사고의 감소로 나타났다. 특히, 발표 불안 감소 에는 정의적, 인지적 접근이, 자기 효능감 개선과 발표역량 향상, 그리고 긍정적 사고 유도에는 행동적 접근이, 그리고 부정적 사고 감소에는 정의적, 행동적 접근이 가장 큰 효과를 나타냈다. 프로그램에 투입되는 요소의 수가 많다고 하여 효과가 더 커지지는 않았다. 본 연구는 실제 교육 현장에서 발표 불안 감소를 위한 프로그램 최적화 및 경 량화를 위한 가이드라인을 제시한다는 점에서 의의가 있다.

This meta-analysis investigates the impacts of the four individual components (i.e., definitional, cognitive, behavioral, and cultural participation approaches) of a speech anxiety program. The results, drawn from a compilation of 117 studies published between 1994 and 2023 (k = 389, N = 11,355), reveal that (a) the definitional and cognitive approaches have the most substantial effect in reducing speech anxiety, (b) the behavioral approach is particularly effective in enhancing self-efficacy, presentation skills, and positive thinking, and (c) the definitional and behavioral approaches show notable effectiveness in rectifying negatively biased thinking. These findings offer practical insights for practitioners seeking to optimize and streamline speech anxiety programs within various educational settings.

The properties of the conductor-mechanical, thermal, and electrical-are the key information in the design and optimization of superconducting coils. Particularly, in devices using second generation (2G) high temperature superconductors (HTS), whose base materials (for example, the substrate or stabilizer) and dimensions are adjustable, a design process for conductor optimization is one of the most important factors to enhance the electrical and thermal performance of the superconducting system while reducing the cost of the conductor. Recently, we developed a numerical program that can be used for 2G HTS conductor optimization. Focusing on the five major properties, viz. the electrical resistivity, heat capacity, thermal conductivity, Z-value, and enthalpy, the program includes an electronic database of the major base materials and calculates the equivalent properties of the 2G HTS conductors using the dimensions of the base materials as the input values. In this study, the developed program is introduced and its validity is verified by comparing the experimental and simulated results obtained with several 2G HTS conductors.

In this paper, recognizing the importance of the database query optimization design methods, we implemented mobile database with mobile program (J2ME) which is a useful database procedures. In doing so, we emphasize the logical query optimization which brings mobile database to performance improvement. The research implies that the suggested mobile program (J2ME) would contribute to the realization of the efficient mobile database as the related technology develops in the future.

Background: In case of radiation emergencies, internal exposure monitoring for the members of public will be required to confirm internal contamination of each individual. In-vivo monitoring technique using portable gamma spectrometer can be easily applied for internal exposure monitoring in the vicinity of the on-site area. Materials and Methods: In this study, minimum detectable doses (MDDs) for 134Cs, 137Cs, and 131I were calculated adjusting minimum detectable activities (MDAs) from 50 to 1,000 Bq to find out the optimal in-vivo counting condition. DCAL software was used to derive retention fraction of Cs and I isotopes in the whole body and thyroid, respectively. A minimum detectable level was determined to set committed effective dose of 0.1 mSv for emergency response. Results and Discussion: We found that MDDs at each MDA increased along with the elapsed time. 1,000 Bq for 134Cs and 137Cs, and 100 Bq for 131I were suggested as optimal MDAs to provide in-vivo monitoring service in case of radiation emergencies. Conclusion: In-vivo monitoring program for emergency response should be designed to achieve the optimal MDA suggested from the present work. We expect that a reduction of counting time compared with routine monitoring program can achieve the high throughput system in case of radiation emergencies.

New performance leaps has been achieved with multiprogramming and multi-core systems. Present parallel programming techniques and environment needs significant changes in programs to accomplish parallelism and also constitute complex, confusing and error-prone constructs and rules. Intel Cilk Plus is a C based computing system that presents a straight forward and well-structured model for the development, verification and analysis of multi-core and parallel programming. In this article, two programs are developed using Intel Cilk Plus. Two sequential sorting programs in C/C++ language are converted to multi-core programs in Intel Cilk Plus framework to achieve parallelism and better performance. Converted program in Cilk Plus is then checked for various conditions using tools of Cilk and after that, comparison of performance and speedup achieved over the single-core sequential program is discussed and reported.

빠른 분석시간과 우수한 분리도를 가진 분석기기로서 크로마토그래피가 분취용으로 이용되기 위해서는 많은 시료양을 취급할 수 있어야 한다. 이 경우 충전물과 관의 크기가 커지게 되면 관의 효율은 분석용에 비해서 떨어지게 된다. 순도와 수율에 미치는 변수가 서로 복잡하게 연관되어 있기때문에 특히 분취용 조업조건의 최적화는 많은 경험과 실험이 요구된다. 또한 많은 상관된 실험변수들이 있고 분리하고자 하는 물질의 종류가 다양하기 때문에 수학적 모델을 적용하여 시료가 관내에서 거동 (behavior)을 예측하는 것이 쉽지 않다. 이러한 문제점을 해결하기 위해서 외국에서는 최소한의 실험을 통하여 고분가 가치 물질을 효율적이고 경제적으로 얻기 위한 크로마토그래피용 프로그램을 활발하게 이용하기 시작하였다. 인하대학교 고순도분리연구실에서 개발된 HCI 프로그램은 단지 LC에 국한된 것이 아니라 GC,SFC (supercritical fluid chromatography) 뿐만아니라 연속식 시스템인 SMB (simulated moving bed)까지 확장될 예정이다.

To separate mixtures analytically and preparatively by LC (Liquid Chormatography), the operating conditions of analytical chromatography should be determined. The HCI program was utilized to find the optimum operating condition accurately and rapidly, and to reduce the number of experiments. In an analytical chromatography, based on the resolution and analysis time, the experimental conditons of deoxyribonucleosides and phopholipids were fixed in terms of taxol was calculated, and the collection time was predicted for the mixture of 5'-IMP and 5'-GMP from the elution profile when and purity wer known.