• 한국태양에너지학회 논문집
• /
• 제33권5호
• /
• pp.82-88
• /
• 2013

There are the stirring test and drain test in the daily performance test to determine the thermal performance of a domestic solar hot water system. The drain test is a test that measures the discharge heating rate while drain the hot water from the top of the storage tank and supply the city water to the bottom of the tank. From the perspective of the user, this drain test is more effective than the stirring test. In this study, the thermal performance were compared through the drain test for a passive type and an active type domestic solar hot water systems consisting of the same storage tank and collectors. At this point, a passive type was used the horizontal storage tanks, and an active type was used vertical storage tank. In the drain test, when the hot water drained up to the reference hot water temperature, an active type which have vertical storage tank represents excellent daily performance than a passive type which have horizontal storage tank regardless of weather conditions. The reason for this is because the vertical storage tank is advantageous to thermal stratification in the tank. After the drain test, the residual heat for the horizontal storage tank was much more than the vertical storage tank, but in the next day the amount of discharged heat were less than the those of vertical storage tank neither. Thus, the solar water heating system which have horizontal storage tank should be adopted preheating control method rather than separate using control method when connected with auxiliary heat source device.

• 생약학회지
• /
• 제44권2호
• /
• pp.200-208
• /
• 2013

The aim of this study was to evaluate the shelf-life of Bojungikgi-tang (Buzhongyiqi-tang in Chinese) by long-term storage test. Experiments were performed to evaluate the stability such as the selected physicochemical, pH, identification, heavy metal, microbiological experiment, and amount of marker compounds under a long-term storage test of Bojungikgi-tang decoction. The significant change was not showed in pH, heavy metal, microbiological, and identification test based on long-term storage test. Furthermore, the HPLC analysis was performed for the determinations of liquiritin, glycyrrhizin, nodakenin, and hesperidin in Bojungikgi-tang by long-term storage test. We were calculated shelf-life of Bojungikgi-tang decoction based on the amount change of four constituents. Consequently, Shelf-life by four compounds at room temperature was predicted 23 month. The suggested shelf-life would be helpful on the storage and distribution of herbal medicine.

• 생약학회지
• /
• 제43권3호
• /
• pp.257-264
• /
• 2012

The purpose of this study was to estimate the shelf-life of Ssanghwa-tang by long-term storage test. Experiments were conducted to evaluate the stability such as the selected physicochemical, pH, identification, heavy metal, microbiological experiment under a long-term storage test of Ssanghwa-tang. The significant change was not showed in pH, heavy metal, microbiological, identification test and quantitative analysis based on long-term storage test. The contents of albiflorin, paeoniflorin, cinnamic acid, liquiritin, and glycyrrhizin in long-term storage test were 66.8-93.1 ${\mu}g/mL$, 429.0-495.0 ${\mu}g/mL$, 3.8-4.4 ${\mu}g/mL$, 32.0-38.1 ${\mu}g/mL$, and 66.8-71.7 ${\mu}g/mL$, respectively. Shelf-lifes by 5 compounds about 3 lots at room temperature were predicted 21-37, 14-21, and 16-72 months, respectively. The suggested shelf-life would be helpful on the storage and distribution of herbal medicine.

• Journal of Computing Science and Engineering
• /
• 제9권3호
• /
• pp.142-154
• /
• 2015

Fault localization techniques help locate faults in source codes by exploiting collected test information and have shown promising results. To precisely locate faults, the techniques require a large number of test cases that sufficiently exercise the executable statements together with the label information of each test case as a failure or a success. However, during the process of software development, developers may not have high-coverage test cases to effectively locate faults. With the test case generation techniques, a large number of test cases without expected outputs can be automatically generated. Whereas the execution results for generated test cases need to be inspected by developers, which brings much manual effort and potentially hampers fault-localization effectiveness. To address this problem, this paper presents a method to select a few test cases from a number of test cases without expected outputs for result inspection, and in the meantime selected test cases can still support effective fault localization. The experimental results show that our approach can significantly reduce the number of test cases that need to be inspected by developers and the effectiveness of fault localization techniques is close to that of whole test cases.

• 대한한의학방제학회지
• /
• 제19권1호
• /
• pp.183-194
• /
• 2011

Objectives : To estimate the shelf-life by long-term storage test of Pyungwi-san. Methods : Experiments were conducted to evaluate the stability such as the selected physicochemical, heavy metal, microbilogical experiment under an acceleration test and long-term storage test of Pyungwi-san in different storage under room temperature, refrigeration and freezing. Futhermore, HPLC analysis was performed for the determinations of glycyrrhizin in the Pyungwi-san on an Inertsil ODS-3 column(250 mm ${\times}$ 4.6 mm, 5 um) using solvent 35% acetonitrile include 0.05% phosphoric acid at 254 nm. The flow rate was 1.0 mL/min. Results : The significant change was not showed in pH, heavy metal, microbiological, identification test and quantitative analysis based on acceleration test and long-term storage test. Retention time of glycyrrhizin in HPLC chromatogram was about 16.065 min and calibration curve showed good linearity($R^2$ = 0.9999). The contents of glycyrrhizin in acceleration test and long-term storage test were 0.068~0.076 mg/mL and 0.066~0.077 mg/mL, respectively. Shelf-lifes of room temperature, refrigeration and freezing by long-term storage test were predicted 41, 24 and 34 months, respectively. Conclusions : The suggested shelf-life would be helpful on the storage and distribution of herbal medicine.

• 스마트미디어저널
• /
• 제6권1호
• /
• pp.9-15
• /
• 2017

ICT 분야의 메가 트렌드는 IoT, Bigdata, 그리고 Cloud Computing 으로 집약된다. 이러한 메가 트렌드들은 독립적으로 운영되지 않으며, 이를 지원하기 위한 백그라운드에는 대용량 컴퓨팅 기술이 필요하듯 대용량 스토리지 기술이 필수적이다. 오픈소스 Ceph 기반의 대용량 스토리지의 성능 평가를 위하여 교육망인 KOREN 네트워크를 이용한 국내 및 해외 사이트와의 Abyss Storage의 실증 테스트를 수행한다. 또한, 스토리지 자체의 성능 평가를 위하여 스토리지 매체와 네트워크 본딩의 성능 테스트를 수행한다. 스토리지 매체별로 실질적인 속도 차이는 크지만 수행된 스토리지 매체 테스트에서는 크게 성능 차이를 보이지 않았다. 이를 해결하기 위한 방안으로 네트워크 가속화를 통한 성능 향상을 얻을 수 있었다. 또한 KOREN 망을 이용한 국내 및 해외 사이트를 연결하여 Abyss Storage의 내부 및 외부 네트워크의 실질적인 성능 테스트를 수행하였다.

• 산업경영시스템학회지
• /
• 제42권2호
• /
• pp.28-35
• /
• 2019

Since guided missiles with the characteristics of the one-shot system remain stored throughout their entire life cycle, it is important to maintain their storage reliability until the launch. As part of maintaining storage reliability, period of preventive test is set up to perform preventive periodic test, in this case failure detection rate has a great effect on setting up period of preventive test to maintain storage reliability. The proposed method utilizes failure rate predicted by the software on the basis of MIL-HDBK-217F and failure mode analyzed through FMEA (Failure Mode and Effect Analysis) using data generated from the actual field. The failure detection rate of using the proposed method is applied to set periodic test of the actual guided missile. The proposed method in this paper has advantages in accuracy and objectivity because it utilizes a large amount of data generated in the actual field.

• 정보저장시스템학회논문집
• /
• 제10권1호
• /
• pp.7-13
• /
• 2014

The Blu-ray Disc Recordable(BD-R) is one of strong candidates for archival application among optical media formats, because of its large capability. However, the well-defined accelerated aging test conditions and evaluation criteria have not yet been fully confirmed for BD-R. In this study, the data stability and degradation aspect of BD-R were analyzed by the random-symbol error rate(R-SER) measurement after the accelerated aging test. And a reasonable test condition of accelerated aging for BD-R and the appropriate evaluation criterion using R-SER measurement were discussed.

• 한국구조물진단유지관리공학회 논문집
• /
• 제25권3호
• /
• pp.68-76
• /
• 2021

적재설비는 지진으로 인한 막대한 손실이 발생한 사례가 있으나, 현재까지 관련 연구 및 규정이 구조요소에 비하여 상대적으로 미비한 대표적인 비구조 요소이다. 본 연구에서는 적재설비의 기둥-기초 연결부의 고정조건에 따른 외력으로 인한 적재설비의 거동특성을 실험적으로 분석하고자 하였다. 일반적으로 적재설비의 기둥-기초 연결부는 설치 기준 및 규정 없이 사용자의 편의에 따라 설치되고 있다. 이러한 이유에서 본 연구에서는 대표적인 4가지 적재설비의 기둥-기초 연결부 조건을 적용한 4가지 full-scale 적재설비를 대상으로 거동특성 분석 실험을 수행하였다. 거동특성 분석 실험은 El-Centro 지진파로 진동대를 2방향 동시 가진하며 수행하였으며, 지진하중의 크기에 따른 거동특성을 확인하기 위하여 지진파의 50% ~ 150% 까지 각 실험 별 50%씩 증가하며 진행하였다. 추가로 각 적재설비의 기초 고정조건별 고유진동수를 확인하기 위하여 공진 탐색실험을 진행하였다. 실험을 통하여 획득한 데이터 중 최상층의 변위와 실험 후 발생한 영구 변위를 각 조건별로 비교하여 적재설비의 기둥-기초 고정조건에 따른 거동특성을 분석하였다. 그 결과, 적재설비는 기초 조건의 변화에 따른 고유진동수의 변화가 미소하였으며, 입력 하중의 고유진동수의 영향보다는 적재설비 기초 고정조건의 변화로 인한 복원력 차이로 인한 영향으로 인하여 거동특성이 변화되는 것을 확인하였다.

• 자동차안전학회지
• /
• 제14권4호
• /
• pp.113-119
• /
• 2022

The structural safety of hydrogen buses is being evaluated for the successful introduction of hydrogen buses. The crash test methodology, for example, side impact test procedure is being discussed for hydrogen bus structure safety with a compressed hydrogen storage system located under the bus floor. Thus this study describes a new experiment method for side impact test with compressed hydrogen storage system independently based on finite element analysis instead of side impact test using full hydrogen bus. A side crash procedure of conceptual compressed hydrogen storage structure was investigated and impact simulations were performed. The finite element models of hydrogen bus, simplified structures, fuel tank system and side impact moving barrier were set up and simulation results reported model performance and result comparison of three different simplified models. Computational results and research discussion proposed the fundamental test framework for safety assessment of the compressed hydrogen storage system.