• 펄프종이기술
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• 제36권1호
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• pp.1-8
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• 2004

One of the most frequently used method for measurement of the degree of sizing (viz., hydrophobicity) is the Stockigt test. However, the Stockigt test was influenced by various factors such as dropping height, dropping amount, dropping speed and viewing angle. The resultant data of the sizing degree on the same specimen also varied according to different testers. Thus, the Stockigt test should be modified to be regarded as a highly reliable and reproducible standard method. For modifying the Stockigt test, it was required to quantify red coloration by reaction between 1％ ferric chloride and 2％ ammonium thiocyante during Stockigt testing. The cameras capturing the serial images during the red coloration process were the CMOS (Complementary Metal Oxide Semiconductor)-type and CCD (Charge Coupled Device)-type cameras. For measurement based on KS M 7025, the CCD-type camera must be used due to its high resolution, and on the other hand, for measurement based on Tappi Useful Method 429, the CMOS-type camera may be used owing to its low resolution. It was needed to covert the RGB values of a droplet image into HSV(Hue, Saturation, and Value) values because the human eyes are much closer to HSV than RGB. Among HSV values, the Hue value was accepted as the most reliable index consistent with the red coloration process by excluding the surrounding conditions such as light, tester's movement etc.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제35회 추계학술대회논문집
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• pp.339-342
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• 2010

두산중공업(주)은 개발 중인 5MW급 발전용 가스터빈의 작동 특성과 설계 인자들을 검증하기 위한 엔진 시험설비를 구축하였으며, 개발 엔진의 모든 성능 인자들을 안전하고 신뢰성 있게 평가하기 위해서 요구 조건을 충족시킬 수 있도록 엔진 테스트 셀을 설계하였다. 구축된 테스트 셀은 엔진의 시동에서 최대 출력조건까지 엔진의 전체 운전 상태를 효과적으로 재현할 수 있기 때문에 다양한 조건에서의 엔진시험 결과를 활용하여 지속적인 설계 개선을 위한 기반시설로 활용 가능하다. 더욱이 개발 엔진의 파생형 모델 개발과 상업모델 출고시험에 활용함으로써 엔진 제작사로서의 개발 경쟁력 제고에 기여할 수 있을 것으로 기대된다.

• 정보과학회 컴퓨팅의 실제 논문지
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• 제21권7호
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• pp.476-481
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• 2015

NIST통계적 난수 검증 모음에 속한 누적 합(CUSUM) 검증을 CUDA 환경에서 병렬화하였다. 배열 사유화를 적용하여 스칼라 변수에 저장하던 랜덤 워크(random walk) 값을 배열 변수에 저장하여 데이터 의존성을 제거하였다. 자료 구조 변경에 따라 알고리즘 각 단계에 병렬 스캔, 스캐터 및 병렬 축약 적용이 가능하게 되었다. 또한 CPU를 사용하여 진행되던 부분을 GPU가 담당하게 하여 두 프로세서 사이의 데이터 이동으로 인해 발생하는 직렬화를 해소하였다. 마지막으로 전역 메모리 접근을 최적화하여 전체적으로 순차적 구현 대비 약 23배에 달하는 성능 향상을 달성하였다. 이 결과는 검증 모음의 실행시간 단축과 더불어 암호 키 보안 향상을 위한 난수 연구에 기여할 것으로 예상된다.

• Clinical and Experimental Pediatrics
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• 제59권6호
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• pp.256-261
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• 2016

Purpose: Latent tuberculosis infection (LTBI) in young children may progress to severe active tuberculosis (TB) disease and serve as a reservoir for future transmission of TB disease. There are limited data on interferon-${\gamma}$ release assay (IGRA) performance in young children, which our research aims to address by investigating the usefulness of IGRA for the diagnosis of LTBI. Methods: We performed a tuberculin skin test (TST) and IGRA on children who were younger than 18 years and were admitted to Chung-Ang University Hospital during May 2011-June 2015. Blood samples for IGRA were collected, processed, and interpreted according to manufacturer protocol. Results: Among 149 children, 31 (20.8%) and 10 (6.7%) were diagnosed with LTBI and active pulmonary TB, respectively. In subjects lacking contact history with active TB patients, TST and IGRA results were positive in 41.4% (29 of 70) and 12.9% (9 of 70) subjects, respectively. The agreement (kappa) of TST and IGRA was 0.123. The control group, consisting of non-TB-infected subjects, showed no correlation between age and changes in interferon-${\gamma}$ concentration after nil antigen, TB-specific antigen, or mitogen stimulation in IGRAs (P=0.384, P=0.176, and P=0.077, respectively). In serial IGRAs, interferon-${\gamma}$ response to TB antigen increased in IGRA-positive LTBI subjects, but did not change considerably in initially IGRA-negative LTBI or control subjects. Conclusion: The lack of decrease in interferon-${\gamma}$ response in young children indicates that IGRA could be considered for this age group. Serial IGRA tests might accurately diagnose LTBI in children lacking contact history with active TB patients.

• 조명전기설비학회논문지
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• 제17권3호
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• pp.11-17
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• 2003

본 논문에서는 충돌검지 다중 접속 프로토콜을 적용하여 기존의 3선식 RS232C직렬 통신 포트를 2선식 공통 통신채널에 접속하여 다중접속을 가능하게 하는 인터페이스의 구현을 다루었다. 기존의 3선식 RS232C직렬 통신포트의 하드웨어의 변경 없이 송신데이터와 수신데이터를 공통데이터 선으로 결합하는 인터페이스회로에 의하여 2선으로 구성하였다. 2선식 연결방법에 의하여 다수의 호스트가 공통선로에 연결되는 경우2개 이상의 호스트가동시에 데이터를 전송할 경우 데이터의 충돌이 발생한다. 이를 감지하기 위하여 전송 데이터를 궤환하여 비교하고 전송데이터의 왜곡 여부로 데이터 충돌을 검지한다. 데이터의 재전송시 충돌 확률을 낮추기 위하여 여러 가지 재전송 모델링을 제시하였으며 각 방법에 대한 실험결과를 통하여 성능을 비교하였다. 본 연구의 결과는 기존의 RS232C 기기의 회로를 거의 변경하지 많고 다중접속이 가능하게 함으로 기존의 각종기기 및 설비를 단일 통신선로에 의한 네트워크에 연결하는 데 응용될 수 있다.

• Journal of Korean Biological Nursing Science
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• 제15권1호
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• pp.1-7
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• 2013

Purpose: The research was to investigate the effect of line dance programs on oxygen saturation level and happiness of elderlies. Methods: Researchers had conducted a series of test to measure peripheral blood vessel oxygen saturation level, pulse and happiness level of 47 elderlies from the D district of G city. Collected data were analyzed with ${\chi}^2$-test and independent t-test, equipped with SPSS WIN 17.0. Results: As a result of serial tests, Pre-test and Post-test of line dance performance showed that oxygen saturation of the Experimental group had significant increase following the program and happiness of the Experimental group also had significant increase following the program. Conclusion: In conclusion, with many advantages such as its easiness to access and emulate as well as its ubiquitousness as an aerobic exercise, line dance cannot only be very beneficial to cardiovascular function and relation of elderlies, but also to emotional and psychological effect, considered as a great breakthrough to improve comprehensive well-being in both physical and mental aspects.

• 한국군사과학기술학회지
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• 제20권3호
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• pp.352-361
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• 2017

This paper proposes a design and fabrication of the test equipment that is implemented as a part of the airborne tracking radar inspection under the environment of indoor simulation. This test equipment provides controlling the operation status of airborne tracking radar and replicating the velocity and range information of target by generating a variety of target signal. This is mainly composed of radar operation controller, target signal generator, horn antenna driving devices. Radar operation controller is able to perform the controlling of radar operation mode and monitoring in real time by serial communication. Target signal generator is generated doppler signal and range delayed signal using virtual target of RF-band. Horn antenna driving devices perform a role of target simulating exercise. In the end, the performance is demonstrated using experiment results of test equipment for airborne tracking radar.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.741-743
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• 2004

In this paper, we describe a Control Element Drive Mechanism(CEDM) operation test using a Power Controller. By testing, we can catch the mechanical and electrical characteristics of CEDM and obtain the information about the improvement of CEDM and the design of CEDM power cabinet. The power controller for CEDM introduced in this paper can input firing angles directly into gate drive circuits of thyristors so that this method can be used to derive the maximum and minimum values of firing angles within available limits for a 3-phase half-wave rectifier. Angle inputs help us understand each coil's response characteristics. Since this power controller generates a serial sequence for CEDM insertion and withdrawal operations, we may judge whether CEDM works correctly as expected or not in each phase of a step movement.

• Pediatric Infection and Vaccine
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• 제4권1호
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• pp.155-159
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• 1997

We had experienced a case of pericarditis associated with Mycoplasma and Salmonella co-infection. This 5-year old boy presented with high fever and generalized tonic-clonic seizure. The diagnosis was based on the markedly increased serial titer of Widal test and cold agglutinin with Mycoplasma indirect hemmagglution test during hospitalization. The electrocardiogram revealed P-R interval prolongation and an echocardiogram revealed moderate pericardial effusion. The patient treated with ceftriaxone and erythromycin for 2 weeks, and responded to the treatment well. We report this case with brief review of the related literatures.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.634_635
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• 2009

Large aluminium electrolytic capacitors are widely used in inverter systems for smoothing dc-link voltage. If capacitors in dc-link are deteriorated by ageing, dc-link voltage is fluctuated by lessened capacitance and their bodies are heated by raised ESR(equivalent serial resistance) and finally system faults can be occurred. In this paper, on-load ageing test method of electrolytic capacitor in inverter system is proposed and test results are shown.