• 한국임상약학회지
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• 제27권3호
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• pp.171-177
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• 2017

Objective: The study purpose was to develop a drug information leaflet for the elderly and to evaluate it with performance-based user-testing. Methods: We performed a stratified randomized controlled trial. We recruited 62 elderly patients with age of 65 or above who were taking antidiabetic medications at the point of participating and excluded those who suffered illiteracy. We randomly allocated them into the intervention group with a leaflet for the elderly and the control group with a leaflet for the general public. Main outcome measures were to 'be able to find information' and to 'be able to understand information.' We measured outcome variables by employing performance-based user-testing and analyzed data to find any differences between two groups with t-tests, chi-squared tests or Fisher's exact tests accordingly. Results: More participants in the intervention group understood how to store their medications than those in the control group (intervention group 93% vs. control group 70%; p=0.02). There were no significant differences in other information items between two groups. Mostly 'being able to understand information' was lower than 'being able to find information.' The gaps between two outcome variables were about 10% in the intervention group and about 18% in the control group. The lowest understanding was observed in information relating to drug names and their potential adverse events. Conclusion: Without providing personalized drug information, it might be hard for the elderly to improve their drug knowledge even with leaflets that were developed specifically for the elderly.

• 한국컴퓨터그래픽스학회논문지
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• 제21권3호
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• pp.27-35
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• 2015

본 연구는 전역 조명 기법 중 하나인 환경-광 가림(ambient occlusion)을 이용한 볼륨 렌더링 방법을 설명한다. 볼륨 밀도 분포를 정규 분포로 가정하여, 환경-광 가림을 불투명도 전이함수의 변경과 무관하게 실시간 가시화할 수 있다. 전처리 과정에서 각 복셀 주변의 일정 크기 영역의 평균과 표준편차를 계산하여 두고, 가시화 단계에서 근방의 불투명도를 추정하여 밝기를 계산한다. 이 논문은 본 연구자들의 기존 연구를 발전시켜 이론적 모델을 일반화하고 출력 영상의 화질을 향상시킨다. 구체적으로 다양한 형태의 불투명도 전이함수를 사용할 수 있는 계산 모델을 제안한다. 그리고 영역의 크기를 다양하게 통계량을 생성하여 근처의 물체에 더 높은 가중치를 부여할 수 있도록 하였다. 최종적으로 환경-광 가림 효과와 지역 조명 효과를 혼합하여, 더 현실감 있는 화질의 볼륨 가시화 영상을 실시간으로 생성할 수 있다.

• 전자공학회논문지
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• 제50권3호
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• pp.113-121
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• 2013

본 논문은 학습 기반의 2D-FIR필터를 이용한 부화소 렌더링 기법을 제안한다. 제안 기법은 크게 학습 단계와 합성 단계로 나뉜다. 학습 단계에서는 충분히 많은 수의 저해상도/고해상도의 영상 블록 쌍들을 이용하여 고해상도/저해상도 블록의 관계에 따른 합성 정보를 계산하고, 그 합성 정보를 담은 소위 사전을 생성한다. 합성 단계에서는 각 입력 영상에 대응하는 후보 블록을 상기 학습된 사전에서 찾는다. 탐색된 사전 내 합성 정보를 이용하여 부화소 레벨의 축소된 블록을 합성함으로써 최종 축소 영상을 얻는다. 한편, 영상 합성 시 디스플레이 장치의 RGB 패턴을 고려한 필터링을 통해 선명도를 향상시킨다. 모의 실험을 통해 제안 기법이 일반적인 영상축소 기법에 비해 흐림 효과, 엘리어싱 등의 화질 열화없이 고화질의 축소 영상을 생성함을 확인하였다.

• 한국지진공학회논문집
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• 제21권4호
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• pp.153-161
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• 2017

Liquid storage tank is one of the major infrastructures and generally used to store gases, drinking and utilizing water, dangerous fluids, fire water and so on. According to the recent reports and experiences, the tank structures are damaged in many earthquakes due to their low energy dissipating capacity. Therefore, many researchers have been tried to know the dynamic properties of the tanks including liquids. However, vary limited experimental studies are carried out using relatively small tank models. In this study, a series of shaking table tests are performed with maximum 2 m cubic rectangular liquid storage tanks made of steel to measure the natural frequency and estimate damping coefficient of impulsive and convective mode of the tanks. Especially, the damping values under different shapes and excitation methods are estimated by logarithmic decrement method and half power band-pass method and compared with current design code and standards such as ASCE 7, Eurocode 8 and NZS. Test results show that the impulsive mode damping is around 2% which is proposed by general standards and codes but the impulsive mode damping is 0.13% average that is slightly lower than the code recommendation.

• 대한한의학회지
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• 제39권1호
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• pp.22-34
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• 2018

Objectives: The purpose of this study is to investigate changes of the marker compounds and anti-inflammatory effect of Gamisoyo-san decoction (GMSYS) depending on storage temperature and periods. Methods: GMSYS was stored at room temperature or refrigeration for 12 months. According to storage temperature and periods, pH and sugar content of GMSYS were measured. To determine the marker compounds of GMSYS, high-performance liquid chromatography analysis was performed. To estimate the anti-inflammatory effect of GMSYS, LPS-induced pro-inflammatory mediators and cytokines were measured in RAW 264.7 cells. Results: There was no change in pH and sugar content depending on storage temperature and periods of GMSYS. The contents of gallic acid and mangiferin in both of room temperature and refrigerated decoctions reduced with increasing storage periods. Chlorogenic acid was time-dependently decreased in case of stored at room temperature. GMSYS significantly inhibited the LPS-induced production of nitric oxide, prostaglandin $E_2$ ($PGE_2$) and IL-6 in RAW 264.7 cells. These effects equally maintained up to 3 months at both of room temperature and refrigeration. Since 4 months, the inhibitory effect of GMSYS on LPS-induced $PGE_2$ production was time-dependently reduced, and the decrease in $PGE_2$ inhibitory effect of decoction stored at refrigeration was lower than that of stored at room temperature. Conclusions: Our results indicate that the anti-inflammatory effect of GMSYS are maintained up to 12 months, but it shows optimal efficacy up to 3 months. It is recommended to store in a refrigeration for short periods since some components decrease as storage periods becomes longer.

• 비파괴검사학회지
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• 제27권1호
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• pp.1-7
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• 2007

섬유강화 복합재료가 항공기, 우주 구조물, 로봇 팔 등에 널리 사용됨에 따라 복합재료의 신뢰도와 안전성을 향상시키기 위하여 이에 대한 비파괴검사법은 매우 중요한 연구분야로 대두되고 있다. AE법은 복합재의 균열, 섬유 또는 수지재의 파손, 층간분리 등의 발생 및 성장과정에서 발생되는 탄성파로 인한 스트레인 에너지를 검출하는 방법이다. 본 논문에서는 $8{\times}8$ 매트릭스형 피에조 센서를 사용하여 인장시험 하에서 발생되는 AE신호를 측정하고 분석하였다. 이를 위하여 AE신호의 전달거리를 제어할 수 있는 전용회로를 설계하고 제작하였다. 또한 64채널의 AE신호를 획득하기 위하여 발광다이오드를 사용한 광학 저장장치를 구성하였다. 실험결과, $8{\times}8$ 매트릭스형 피에조 센서를 이용하여 복합재료에서 발생되는 AE신호의 발생지점과 전파경로를 효과적으로 검출할 수 있었다.

• Journal of Forest and Environmental Science
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• 제34권4호
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• pp.293-303
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• 2018

Sumber Jaya (54,194 hectares) is a district in West Lampung, Indonesia, located at the upper part of Tulang Bawang watershed. This watershed is one major water resource for Lampung Province, but has become a focal point of discussion because of the widespread conversion of forestland to coffee plantations and human settlements which lead to environmental and hydrological problems. This research aimed to evaluate Sumber Jaya watershed affecting by rapid land use change using hydrological methods as a base for watershed management. Nested catchment structure consisted of eight sub-catchments was employed in this research to assess scaling issues of land use change impacts on rainfall-runoff connections. Six tipping bucket rain gages were installed on the hill slopes of each sub-catchment and Parshall flumes were installed at the outlets of each sub-catchment to monitor stream flow. First, unit hydrograph that expressed the relationship of rainfall and runoff was computed using IHACRES model. Second, unit hydrograph was also constructed from observations of input and response during several significant storms with approximately equal duration. The result showed that most of the storm flow from these catchments consisted of slow flow. A maximum of about 50% of the effective rainfall became quick flow, and only less than 10% of remaining effective rainfall which was routed as slow flow contributed to hydrograph peaks; the rest was stored. Also, comparing peak responses and recession rates on the hydrograph, storm flow discharge was generally increased slowly on the rising limb and decreased rapidly on the falling limb. These responses indicated the soils in these catchments were still able to hold and store rain water.

• 한국인터넷방송통신학회논문지
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• 제12권5호
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• pp.83-90
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• 2012

본 논문은 안드로이드 기반 스마트폰을 이용한 소규모 실시간 라디오 방송 시스템 설계 및 구현에 관한 연구이다. 서버-클라이언트 구조로 설계하였으며, 시스템을 간단히 하기 위하여 데이터 전송 방식으로 HTTP에 의한 점진적 다운로드 기법을 사용하였다. 실시간 방송을 실현하기 위하여 원음을 짧은 시간 간격으로 잘라서 캡쳐하여 압축/저장하였고, 이들을 순차적으로 클라이언트에서 재생하는 방법을 사용하였다. 이 방법은 서버에서 캡쳐 시 원음을 잃음과 클라이언트에서 재생 시 파일과 파일 사이 재생의 끊어지는 두 가지 문제를 발생 시킨다. 서버에서는 캡쳐 스레드와 압축/저장 스레드로 분리하고, 이중 버퍼링을 사용하여 해결하였으며, 클라이언트에서는 안드로이드에서 제공하는 미디어플레이어를 사용하고, 하나의 파일 큐에 다수의 음원 파일을 저장하여 해결하였다.

• Clinical and Experimental Reproductive Medicine
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• 제26권2호
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• pp.127-135
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• 1999

Cryopreservation is able to store the surplus pre-embryos for freezing and furthermore thawing and transfer in a subsequent cycle. Cryopreserving cells which are maintaining their viability are the very complex process. This study has been carried out in order to find the effects of cryopreservation steps, freezing media and embryonic stages on the rates of viability and development of cryopreserved mouse embryos. Female ICR mice ($6{\sim}8$ weeks old) were induced to superovulate by sequential intraperitoneal injection of 5 IU PMSG and 5 IU hCG 48h apart. Mouse embryos were collected according to its developmental stage after the injection of hCG. Embryos were cryopreserved not only by cryoprotectant step (1 step${\sim}$4 step) but also in a variety of media (HTF, IVF medium, D-PBS) and cell stage. The results were as follows: There is no clear advantage in these freezing media of rapid method, but 4 cell and 8 cell of slow method (2, 3, 4 step) have advantage in D-PBS. The development of embryos according to cell stage become greater in 8 cell stage. In the treatment steps of cryopreservation, the development of embryo to blastocyst was similar among rapid method, but the development of 4 cell and 8 cell embryos to blastocyst according to slow method was better than rapid method.

• 한국식품저장유통학회지
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• 제8권1호
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• pp.30-36
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• 2001

월동배추(품종 : 동풍)를 $0^{\circ}C$에서 저온저장중 선도 유지를 위하여 포장과 적입방법 개선에 대한 효과가 조사되었다. 저장과정중 배추의 상품성을 보았을 때 월동배추는 $0^{\circ}C$에 저온 저장한 경우 4개월 이상 저장, 출하가 가능한 것으로 여겨졌다. 포장용기간 저장성은 0.03mm 폴리에칠렌 플라스틱필름에 4포기씩 세로로 적입하여 플라스틱콘테이너에 저장한 경우가 기존의 폴리프로필렌 그물망과 철제파레트를 이용한 경우에 비하여 우수하게 나타났다. MAP 저장시 포장내의 가스 조성은 처리구간에 큰 유의적인 차이를 나타내지는 않았는데 대체로 산소 농도는 8.2~19.5% 정도, 이산화탄소는 0.35~8.58% 범위를 나타내었다. 저온저장중 비타민C, 환원당, 클로로필 색소는 계속 감소하였으며 폴리에틸렌 플라스틱필름과 콘테이너에 의한 MAP가 기존 저장방법에 비하여 10~20% 정도 선도 저하를 억제하는 효과를 가져왔다.