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In-memory data grid 기술을 활용한 택시 애플리케이션 성능 향상 기법 연구
최치환(Chihwan Choi),김진혁(Jinhyuk Kim),박민규(Minkyu Park),권가은(Kaaen Kwon),정승현(Seunghyun Jung),프란코나자레노(Franco Nazareno),조완섭(Wansup Cho) 한국데이터정보과학회 2015 한국데이터정보과학회지 Vol.26 No.5
최근 빅데이터 분야에서 데이터를 메모리에 적재 후 빠르게 처리하는 인메모리 컴퓨팅 기술이 새롭게 부각되고 있다. 인메모리 컴퓨팅 기술은 과거 대용량 메모리와 다중 프세서를 탑재한 고성능서버에 적용 가능하였지만, 점차 일반 컴퓨터를 초고속 네트워크로 연결하여 분산·병렬처리가 가능한구조로 변화하고 있다. 본 논문은 In-memory data grid (IMDG) 기술을 택시 애플리케이션에 접목하여 기존의 데이터베이스의 변경 없이 성능을 향상시키는 기법을 제안한다. IMDG 기술을 적용한경우 기존의 데이터베이스 반의 웹서비스에 비해 처리속도와 처리량이 평균 6∼9배정도 증가하며, 또한 부하량에 따른 처리량 변화의 폭이 매우 작음을 확인 하였다. Recent studies in Big Data Analysis are showing promising results, utilizing the main memory for rapid data processing. In-memory computing technology can be highly advantageous when used with high-performing servers having tens of gigabytes of RAM with multi-core processors. The constraint in network in these infrastructure can be lessen by combining in-memory technology with distributed parallel processing. This paper discusses the research in the aforementioned concept applying to a test taxi hailing application without disregard to its underlying RDBMS structure. The application of IMDG technology in the application’s backend API without restructuring the database schema yields 6 to 9 times increase in performance in data processing and throughput. Specifically, the change in throughput is very small even with increase in data load processing.
마이크로다공성 발열체 표면에서의 액체분무 냉각성능 특성
김윤호,최치환,이규정 대한설비공학회 2006 설비공학 논문집 Vol.18 No.4
Experiments on evaporative spray cooling on the square plate heaters with plain or micro-porous coated surfaces were performed in this study. Micro-porous coated surfaces were made by using DOM[Diamond particle, Omegabond 101, Methyl-Ethyl-Keton] method. In case of purely air-jet cooling, the micro-porous coating doesn't affect the cooling capacity. In spray cooling three different flow patterns(complete wetting, evaporative wetting, dryout) are observed on both plain and micro-porous coated surfaces. The effects of various operating conditions, such as water flow rate, particle size, and coating thickness were investigated on the micro-porous coated surfaces. It is found that the level of surface wetting is an important factor to determine the performance of spray cooling. It depends on the balance between absorbed liquid amount by capillary force over porosity and the evaporative amount. The micro- porous coated surface has largest cooling capacity, especially in the evaporative wetting zone. It is found that the effects of liquid flow rate and coating thickness are significant in evaporative wetting zone, but are not in complete wetting and dryout zones.
최원영,최치환,김정규,김현숙,이주상,정연규 한국신경근육물리치료학회(구 한국신경근육재활학회) 2020 한국신경근육재활학회지 Vol.10 No.3
This study aimed to compare the effects of horizontal vibration exercise and core exercise on patients with non-specific chronic low back pain. This was an experimental single- blinded, randomized controlled trial. Thirty-nine older patients with non-specific chronic low back pain from the Rehabilitation Center in an University Hospital were randomly assigned to either a horizontal vibration group or a core exercise group. All patients underwent 30 min of each exercise three times a week for 12 weeks. Main outcome measures of perceived pain level, pain-related dysfunction, muscle strength and thickness, and postural stability were assessed at baseline, interim (6 weeks), soon after intervention (12 weeks), and post-intervention of 1 month (follow-up). Both groups showed improved perceived pain level, pain-related dysfunction, muscle strength of lumbar flexion and extension, and balance stability after the intervention(all p<.01). These effects maintained at follow-up of 1 month. There was no significant difference between two intervention groups for any outcome measure. Horizontal vibration and core exercises had the same effects on all outcome measures on patients with non-specific chronic low back pain. Patients with severe back pain and limited active movements may benefit from horizontal vibration equally to core exercise.
Role of radiotherapy for pancreatobiliary neuroendocrine tumors
이정심,최진현,최치환,성진실 대한방사선종양학회 2013 Radiation Oncology Journal Vol.31 No.3
Purpose: We investigated the role of radiotherapy (RT) for pancreatobiliary neuroendocrine tumors (PB-NETs). Materials and Methods: We identified 9 patients with PB-NETs who received RT between January 2005 and March 2012. Of these 9 patients, 4 were diagnosed with NETs in the pancreas and 5 were diagnosed with NETs in the gallbladder. All patients received RT to the primary tumor or resection bed with a median total irradiation dose of 50.4 Gy, with or without chemotherapy. Results: The tumor response rate and tumor control rate in the RT field were 60% and 100 %, respectively. All 4 patients who underwent surgery had no evidence of disease in the RT field. Of the 5 patients who received RT to the primary gross tumor, 1 had complete response, 2 had partial response, and 2 had stable disease in the RT field. The median time to progression was 11 months. Of the 9 patients, four patients had no progression, and 5 patients had progression of disease (locoregional, 2; distant, 2; locoregional/distant, 1). Of the 4 patients without progression, 3 were treated with RT in adjuvant or neoadjuvant setting, and one received RT to primary tumor. One patient experienced radiation-induced duodenitis at 3 months after concurrent chemoradiation without treatment-related mortality. Conclusion: RT can yield local control for advanced PB-NETs. RT should be considered an essential part of multimodality treatment in management of advanced PB-NETs.