Locking 메카니즘의 변화에 따른 Ada'95 태스킹의 성능 향상

류중렬,오동익 순천향대학교 부설 산업기술연구소 1999 순천향 산업기술연구소논문집 Vol.5 No.2

Locks are commonly adopted objects for maintaining data consistency when multiple threads of control are present in an application. However, performance of a parallel application may be affected by the choice of the lock granularity. In this paper, we look into the locking mechanisms used to implement Ada Tasking, which provides programming level parallelism through Ada Tasks. We compare overall tasking performance of a conventional tasking system, which currently uses Multiple-Lock granularity, with that of the one using the Single-Lock granularity By doing this, we are aimed at suggesting a way to improve overall performance of the Ada Tasking Runtime System. In order to realize the goal, we implement an Ada Tasking Runtime System based on Single-Lock mechanism and take timing measurements on several important Ada tasking semantics using both the Single-Lock and the Multiple-Lock based runtime system. The timing results acquired then will be used far suggesting a better locking mechanism to improve overall Ada Tasting performance.

Improving ada`95 tasking performance on linux using different locking granularities

Jung Ryol Ryu,Dong Ik Oh 한국경영정보학회 2000 한국경영정보학회 학술대회논문집 Vol.2000 No.-

Edge Preserving Speckle Reduction of Ultrasound Image with Morphological Adaptive Median Filtering

Ryu, Kwang-Ryol,Jung, Eun-Suk The Korea Institute of Information and Commucation 2009 Journal of information and communication convergen Vol.7 No.4

Speckle noise reduction for ultrasound CT image using morphological adaptive median filtering based on edge preservation is presented in this paper. Speckle noise is multiplicative feature and causes ultrasound image to degrade widely from transducer. An input image is classified into edge region and homogeneous region in preprocessing. The speckle is reduced by morphological operation on the 2D gray scale by using convolution and correlation, and edges are preserved. The adaptive median is processed to reduce an impulse noise to preserve edges. As the result, MAM of the proposed method enhances the image to about 10% in comparison with Winner filter by Edge Preservation Index and PSNR, and 10% to only adaptive median filtering.

The Prevalence and Management of Anemia in Chronic Kidney Disease Patients: Result from the KoreaN Cohort Study for Outcomes in Patients With Chronic Kidney Disease (KNOW-CKD)

Ryu, Sang-Ryol,Park, Sue K.,Jung, Ji Yong,Kim, Yeong Hoon,Oh, Yun Kyu,Yoo, Tae Hyun,Sung, Suah The Korean Academy of Medical Sciences 2017 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.32 No.2

<P>Anemia is a common and significant complication of chronic kidney disease (CKD). However, its prevalence and current management status has not been studied thoroughly in Korea. We examined the prevalence of anemia, its association with clinical and laboratory factors, and utilization of iron agents and erythropoiesis stimulating agents using the baseline data from the large-scale CKD cohort in Korea. We defined anemia when hemoglobin level was lower than 13.0 g/dL in males and 12.0 g/dL in females, or received by erythropoiesis stimulating agents. Overall prevalence of anemia was 45.0% among 2,198 non-dialysis CKD patients from stage 1 to 5. Diabetic nephropathy (DN) as a cause, CKD stages, body mass index (BMI), smoking, leukocyte count, serum albumin, iron markers, calcium, and phosphorus concentration were identified as independent risk factors for anemia. Considering the current coverage of Korean National Health Insurance System, only 7.9% among applicable patients were managed by intravenous iron agents, and 42.7% were managed by erythropoiesis stimulating agents.</P>

Ventricle Image Restoration and Enhancement with Multi-thresholding and Multi-Filtering

Ryu, Kwang-Ryol,Jung, Eun-Suk The Korea Institute of Information and Commucation 2009 Journal of information and communication convergen Vol.7 No.2

Speckle noise reduction for power Doppler ventricle coherent image for restoration and enhancement using Fast Wavelet Transform with multi-thresholding and multi-filtering on the each subbands is presented. Fast Wavelet Transform divides into low frequency component image to high frequency component image to be multi-resolved. Speckle noise is located on high frequency component in multi-resolution image mainly. A Doppler ventricle image is transformed and inversed with separated threshold function and filtering from low to high resolved images for restoration to utilize visualization for ventricle diagnosis. The experimental result shows that the proposed method has better performance in comparison with the conventional method.

과학고 및 영재고 Research and Education (R&E) 운영실태 분석 및 활성화방안 제안 : R&E 운영담당자 면담사례를 중심으로

정현철,류춘렬,채유정 韓國英才學會 2012 영재교육연구 Vol.22 No.2

The purpose of this study was to investigate the current status of R&E programs in gifted high schools/science high schools and to provide suggestions for the better program. The sample included 21 R&E coordinators in the gifted high schools and science high schools. They filled out the survey, asking about the R&E program; then, the researchers interviewed the coordinators based on the answers of the survey. The results are as follows: 1) The R&E guidelines and related materials were not enough to use. 2) At the planning step, students and the mentors received were provided a little information, such as ethical issues, students' information, the roles of mentors/ students, mentor's research interest areas and products, etc. 3) At the research step, 80% of the schools had the monitoring process but the details were not written and saved. 4) At the evaluation step, the rubric of the product evaluation existed; the rubric of performance process were established by half of the schools. 5) At the closing step, 100% of the schools had the final product materials; the results of the evaluation and the information of the mentors were saved by 2/3 and 1/3 of the schools, respectively. Discussions and suggestions were included for the better R&E programs. 본 연구에서는 R&E 프로그램의 운영지원현황 및 실태를 알아보기 위하여 R&E 운영단계를 준비-계획-실행-평가-종료 5단계로 구분하여 조사 및 분석이 이루어졌다. 총 18개 과학고와 3개 영재학교 R&E 운영담당자들이 본 연구에 참여하였다. 2010년 12월, 전수조사를 목적으로 각 학교에 설문지를 배포하였으며, R&E 운영담당자 21명(100%)이 설문에 응답하였다. 주요 결과는 다음과 같다. 첫 번째, 준비단계에서 학생의 R&E 수행지침은 적절히 이루어지지 않고 있었으며, 운영을 위해 참고할 수 있는 자료도 매우 부족한 것으로 나타났다. 두 번째, 계획 단계에서 지도자를 대상으로 윤리적인 문제, 참고자료, 학생배경 특성 등에 관한 안내가 적절히 이루어지지 않고 있었으며, 학생들에게 지도자의 의무와 역할, 연구정보 및 업적 등에 대한 정보제공이 충분히 이루어지지 않고 있었다. 세 번째, R&E 실행단계에서는 80%의 학교가 수행 점검을 실시하고 있었으나 세부적인 점검내용에 대한 기록은 이루어지지 않고 있었다. 네 번째, 평가단계에서 산출결과의 평가기준은 모든 학교가 갖추고 있었으나, 수행 과정에 대한 평가기준은 약 절반의 학교만 가지고 있었고, 평가비율에 발표내용과 결과보고서 비율이 높게 나타나 평가가 ‘결과’에 많은 비중을 두고 있는 것으로 나타났다. 마지막으로, 종료단계에 결과자료집은 100% 보관되고 있었으나 평가결과는 2/3 학교가, 그리고 지도교수 정보는 약 1/3의 학교만이 보관하고 있는 것으로 나타났으며, 학생관찰 내용 및 면담자료도 비교적 잘 보관되지 않는 것으로 나타났다. 이와 같은 결과를 바탕으로, 효과적인 R&E 프로그램 운영을 위한 운영개선 지원방안을 제시하였다.

과학영재 학생창의연구(R&E) 사업의 정책집행 분석

류춘렬(Chun-Ryol Ryu),박경진(Kyeong-Jin Park),정현철(Hyun-Chul Jung) 한국영재학회 2017 영재교육연구 Vol.27 No.4

본 연구는 과학고‧영재학교 학생창의연구(R&E) 사업을 중심으로 R&E 담당교원의 운영 인식을 통해 R&E 사업의 문제점을 파악하고, 정책적 개선방안을 찾기 위해 이루어졌다. 이를 위해 정책목표와 정책수단의 불일치 관점에서 R&E 정책집행과정과 현장 정책행위자들의 인식을 분석하였다. 분석결과 R&E 사업은 정책의 비일관성, 정책 어그러짐의 관점에서 정책목표와 정책수단의 불일치를 보이고 있으며, 학교에 자율성을 부여하고 나서도 여전히 통제중심의 정책설계가 이루어지는 경향이 나타나고 있다. 더불어 R&E 담당교원의 인식조사 결과 과중한 업무부담, 전문가 섭외의 어려움, 장기적 계획 수립의 어려움, 과도한 성과 지향적 운영, 예산의 늦은 지급, 지도교사의 인센티브 부재, 그리고 첨단장비 활용·관리를 위한 전문인력 부재 등의 문제들은 R&E 사업의 운영을 어렵게 만드는 핵심적인 원인이며, R&E 정책목표의 효과적인 달성을 저해하는 현장요인으로 작용하고 있다. This research aims to grasp, with R&E program of science high school and the gifted school as the center, drawbacks of R&E program through R&E teachers’ operational awarenesses, and to search for the measures of improvement in terms of policy. To that end, in this study analyzed implementation processes of R&E policies, and awarenesses of policy actor in the field in terms of disjunctions between policy goal and policy instrument. As a result, there exist disjunctions in R&E program, of which are inconsistency and policy-slippage. And although schools are granted autonomy, still regulative policy design is tend to be maintained. In addition, according to results of the research on R&E teachers’ awareness, there are a large number of problems which are the main causes making the operation of R&E program even more difficult; heavy work burden, troubles of casting experts, difficulties of establishing long-term plans, excessive result-oriented operations, delay of budget provisions, absence of incentives for the guidance teachers, shortage of professional manpower for management and application of advanced equipment, etc. These innumerable problems act as onsite factors that disrupt effective accomplishment of R&E policy goal.

과학고·영재학교 에듀테크 활성화 사업의 정책수용성 분석: 학교장의 수용의지를 중심으로

류춘렬(Chun-Ryol Ryu),김범석(Beom-Seok Kim),서성원(Sung-Won Seo),정현철(Hyun-Chul Jung) 한국영재학회 2021 영재교육연구 Vol.31 No.2

과학영재교육기관 관리자의 정책인식분석: 정책집행 영향요인을 중심으로

류춘렬(Chun-Ryol Ryu),박경진(Kyeong-Jin Park),김범석(Beom-Seok Kim),정현철(Hyun-Chul Jung) 한국영재학회 2020 영재교육연구 Vol.30 No.4

이 연구는 과학영재교육기관 관리자의 정책인식을 분석하고 개선방안을 도출하기 위한 목적으로 수행되었다. 이를 위해 정책집행의 상향적 접근 방법을 통해 관리자의 인식을 분석하였으며, 정책집행 이론에 근거하여 관리자 정책인식을 결정하는 요인을 정책목표 요인, 집행기관 요인, 집행관리 요인, 정책환경 요인, 그리고 정책성과 요인으로 구성하였다. 총 35명의 과학영재교육기관 관리자들이 설문에 응답하였으며, 후속적으로 심층면담을 진행하였다. 과학영재교육기관 관리자들의 정책인식 분석 결과, 과학영재교육기관 관리자들은 정책목표가 모호하고 일관성이 부족하며, 과학영재 선발과정과 교육과정의 자율성 확대가 우선적으로 개선되어야 한다고 인식하고 있었다. 그리고 과학영재교육기관의 평가·관리측면에서는 타당성 제고와 평가자의 전문성 확보가 시급하다고 인식하고 있었다. 마지막으로 정책환경과 관련해서는 전반적으로 안 좋아지고 있지만 이를 개선하기 위해 정책추진에 대한 정부의 의지가 가장 중요하며 시급히 개선해야 할 문제라고 인식하고 있었다. 이에 따라 과학영재교육 정책성과를 증진시키기 위한 정책대안을 정책집행의 상향적 관점에서 제안하고자 하였다. This study was conducted to analyze the policy perception of science-gifted education institution administrators and to derive improvement plans. In order to analyze the administrators’ perceptions, policy implementation theory was used as a foundation, and the factors that determined administrators’ policy perception comprised the policy target, executive agency management, environment, and performance factors. A total of 35 administrators responded to the questionnaire, which was then followed by in-depth interviews. As a result, the administrators of science-gifted educational institutions have recognized that policy goals are ambiguous and lack consistency. They also recognized that the science-gifted selection process should be improved, and autonomy in the curriculum should be expanded. In addition, managers realized the need to provide appropriate, high quality evaluation and management, and to increase the expertise of evaluators. Finally, administrators found that the policy environment was lagging, and that the government needed a strong initiative to improve it. This study attempts to propose research-based alternatives to improve policy outcomes for science-gifted education.

제3차 과학영재발굴육성종합계획 성과분석: 정책집행 행위자 인식을 중심으로

류춘렬(Chun-Ryol Ryu),김희목(Heemok Kim),권경아(Kyunga Kwon),김지선(Jiseon Kim),정현철(Hyun-Chul Jung) 한국영재학회 2023 영재교육연구 Vol.33 No.2