• 영어어문교육
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• 제7권2호
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• pp.17-36
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• 2002

This article begins by exploring recent developments in the use of the world wide webs in language testing about what a Web-based language test (WBT) is and how they are used in language testing. After a brief review of computer-based testing, WBTs are defined and categorized as low-tech or high tech. Since low-tech tests are the more feasible, they will constitute the focus of this paper. Next, item types for low-tech WBTs are described, and validation concerns that are specific to WBTs are discussed. After a brief overview of the combination of computer-adaptive and Web-based tests, the general advantages as well as design and implementation issues of WBTs are considered before examining the role that testing consequences play in deciding whether a WBT is an appropriate assessment instrument. It is argued that WBTs are most appropriate in low-stakes testing situations; but with proper supervision, they can also be used in medium-stakes situations although they are not generally recommended for high-stakes situations. Some possible ideas for future research are suggested.(169)

• 한국과학교육학회지
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• 제18권3호
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• pp.327-336
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• 1998

본 연구에서는 초등학생들의 평소 학습과 시험 상황에서의 인지 전략 및 메타인지 전략 사용을 성취 수준, 동기 수준 및 성에 따라 비교하고, 이들 전략과 학업 성취도, 동기와의 관계를 분석한 후 학업 성취도에 대해 설명력이 큰 학습 전략을 조사하였다. 성취도 상위 집단 학생들은 평소 학습에서 인지 및 메타인지 전략을 하위 집단에 비하여 더 많이 사용하였으며, 시험 상황에서는 인지 전략의 사용을 하위 집단보다 더 많이 하였다. 학습 동기 수준이 높은 학생들은 평소 및 시험 상황에서 인지 전략과 메타인지 전략을 하위 수준의 학생들보다 더 많이 사용하였다. 여학생이 남학생에 비하여 평소 학습에서 전략 사용을 활발히 하는 반면 시험 상황에서는 인지 및 메타인지 전략 사용에서 성차가 없었다. 학업 성취도 및 동기와 이들 학습 전략들과의 상관은 모두 유의미하였다. 중다회귀분석 결과, 평소 학습에서 사용하는 인지 전략이 학업 성취도에 대한 가장 큰 설명력을 지니는 것으로 나타났다.

• 품질경영학회지
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• 제17권2호
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• pp.17-26
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• 1989

This paper is concerned with forecasting the existing number of errors in the computer software and optimizing the stopping time of the software test based upon the forecasted number of errors. The most commonly used models have assessed software reliability under the assumption that the software failure late is proportional to the current fault content of the software but invariant to time since software faults are independents of others and equally likely to cause a failure during testing. In practice, it has been observed that in many situations, the failure rate decrease. Hence, this paper proposes a mathematical model to describe testing situations where the failure rate of software limearly decreases proportional to testing time. The least square method is used to estimate parameters of the mathematical model. A cost model to optimize the software testing time is also proposed. In this cost mode two cost factors are considered. The first cost is to test execution cost directly proportional to test time and the second cost is the failure cost incurred after delivery of the software to user. The failure cost is assumed to be proportional to the number of errors remained in the software at the test stopping time. The optimal stopping time is determined to minimize the total cost, which is the sum of test execution cast and the failure cost. A numerical example is solved to illustrate the proposed procedure.

• ETRI Journal
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• 제35권1호
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• pp.109-119
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• 2013

Static testing of analog-to-digital (A/D) and digital-to-analog (D/A) converters becomes more difficult when they are embedded in a system on chip. Built-in self-test (BIST) reduces the need for external support for testing. This paper proposes a new static BIST structure for testing both A/D and D/A converters. By sharing test circuitry, the proposed BIST reduces the hardware overhead. Furthermore, test time can also be reduced using the simultaneous test strategy of the proposed BIST. The proposed method can be applied in various A/D and D/A converter resolutions and analog signal swing ranges. Simulation results are presented to validate the proposed method by showing how linearity errors are detected in different situations.

• International Journal of Contents
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• 제10권3호
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• pp.41-46
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• 2014

A cause-effect graph considers only the desired external behavior of a system by identifying input-output parameter relationships in the specification. When testing a software system with cause-effect graphs, it is important to derive a moderate number of tests while avoiding loss in fault detection ability. Pairwise testing is known to be effective in determining errors while considering only a small portion of the input space. In this paper, we present a new testing technique that generates pairwise tests from a cause-effect graph. We use a Boolean Satisbiability (SAT) solver to generate pairwise tests from a cause-effect graph. The Alloy language is used for encoding the cause-effect graphs and its SAT solver is applied to generate the pairwise tests. Using a SAT solver allows us to effectively manage constraints over the input parameters and facilitates the generation of pairwise tests, even in the situations where other techniques fail to satisfy full pairwise coverage.

• 아동학회지
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• 제22권4호
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• pp.331-341
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• 2001

This study is to investigate whether young Korean children have understanding for testing hypothesis. Questions explored are; First, do children have notions of testing hypothesis? Or, do they just produce an effect? Second, choosing between conflicting hypotheses, can children distinguish between experiments that would produce conclusive and inconclusive evidence? For this study, 15 first grade and 15 second grade children in elementary school located in Kyunggi area near Seoul participated. Data collection and analysis were based on interviews with children for two weeks. Children were presented two conflicted hypotheses to decide which one is correct through conclusive evidence and inconclusive evidence in the interview. The results showed that children(1st: 93.3%, 2nd: 81.3%) of each grade can distinguish between hypothesis and evidence to do testing hypothesis, and distinguish between conclusive and inconclusive evidence. In conclusion, most young children have understanding of testing hypothesis based on their familiar experiences, so it was possible for them to differentiate hypothesis from evidence in certain situations.

• 통상정보연구
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• 제11권2호
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• pp.329-342
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• 2009

The purpose of this study was to identify the issues which how situational constraints of negotiation affect outcomes. To achieve the purpose of this research, a multiple regression model was set up to identify the relationships between situational constraints of negotiation and negotiation outcome on international trade contracts. To implement the study, empirical questionnaires were collected from Korean business men who have actually conducted international trade with foreign firms. Reliability analysis and factor analysis were used to assess the reliability and validity of research variables. and multiple regression analysis were used for testing the relationships between situational constraints of negotiation and negotiation outcome. From this study, following results were identified; i) situational constraints of negotiation effects on negotiation outcomes ii) arbitrary and continuous situations affect significantly positive on negotiation outcomes iii) submissive situations affect significantly negative effects on negotiation outcomes In conclusion, participant of negotiation and their managers try to promote negotiation situation toward to arbitrary and continuous situations if they have any availability.

• 응용통계연구
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• 제25권3호
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• pp.423-434
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• 2012

A two-sample test for equality of survival distribution is one of the important issues in survival analysis, especially for clinical and epidemiological research. With interval censored data, some testing methods have been developed. This study introduces some testing methods and compares them under various situations through simulation study. Based on simulation result, it provides some useful information on choosing the most appropriate testing method in a given situation.

• 마이크로전자및패키징학회지
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• 제21권4호
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• pp.33-39
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• 2014

To establish the reliability of a packaging structures, adhesion testing of key interfaces is a critical task. Due to the material mismatch, the interface may be prone to delamination failure due to conditions during the manufacturing of the product or just from the day-to-day use. To assess the reliability of the interface adhesion strength testing can be performed during the design phase of the product. One test method of interest is the four-point bending (4PB) adhesion strength test method. This test method has been implemented in a variety of situations to evaluate the adhesion strength of interfaces in bimaterial structures to the interfaces within thin film multilayer stacks. This article presents a review of the 4PB adhesion strength testing method and key implementations of the technique in regards to semiconductor packaging.

• 한국과학교육학회지
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• 제30권8호
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• pp.1110-1122
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• 2010

본 연구의 목적은 달의 운동에 대한 초등학생들의 대안개념 유형을 조사하고, 각각의 대안개념에 대하여 인지갈등 상황을 제시한 후 그 변화를 알아보는 것이다. 대안개념의 유형을 조사하기 위하여 206명의 초등학교 6학년 학생을 대상으로 사전 개념조사를 실시하여 대안개념을 분석한 후, 문항별 개념유형에 따라 5개 집단으로 의도적으로 나누어 30명을 표집 하였다. 학생들의 대안개념 유형과 인지갈등 상황 후의 변화에 대한 데이터를 각각 5문항이 포함된 사전검사와 사후검사를 통하여 수집하였다. 대안개념 유형에 대한 조사 결과 학생들의 대부분이 다양한 유형의 대안개념을 갖고 있었다. 갈등상황 후 개념변화에 대해서는 특히, 초승달의 뜨고 지는 시각 및 움직임에 대한 대안개념은 표본 집단 모두 과학적 개념으로 변화되었다. 따라서 대안개념에 대한 인지갈등 상황 제시 학습이 달의 운동에 대한 학습에 효과 있을 알 수 있다.