• Journal of the Korean Geotechnical Society
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• v.17 no.5
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• pp.17-27
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• 2001

지하 굴착공동의 천장면에 형성되는 잠재적 키블록의 존재성과 운동학적 거동 양상 및 안정성을 해석적으로 분석할 수 있는 시스템을 개발하였다. 천장에서 측정된 절리들의 상대적인 위치와 방향성 자료를 이용하여 데이타베이스를 구축하였으며, 굴착설계도와 연계된 전산절리도를 작성하였다. 잠재적 키블록의 존재성과 거동양상은 사면체로 가정된 블록 옆면의 3차원 공간에서의 평면식을 절리의 방향성에 의거하여 구성하며 대수학적으로 분석되었다. 블록의 안정성 분석은 자중에 의해 미끄러짐이 발생되는 블록면의 공간 기하학적 특성을 고려하여 수행하였다. 개발된 분석시스템의 현장활용성을 검증하기 위하여 언양 자수정동굴에서 키블록 형성 및 거동양상을 조사하여 분석결과와 비교하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.1718-1721
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• 2015

본 논문에서 구현한 헬스케어 서버 시스템은 사용자가 스스로 자신의 건강을 관리할 수 있도록 돕는 플랫폼으로서, 모바일 애플리케이션을 이용하여 자신의 운동, 식단 등과 같은 건강기록을 관리할 수 있으며, 또한 건강기록들을 바탕으로 사용자에게 알맞은 건강 정보를 제공한다. 또한 개인 건강기록(PHR) 정보와 라이브로그를 저장하기 위한 데이터베이스 및 지식베이스를 설계하고, 온톨로지 및 데이터마이닝 기법을 적용하여 사용자에게 맞춤형 건강정보를 제공하는 기능을 수행한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.3
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• pp.781-793
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• 2010

Recently, owing to the development of ubiquitous sensor network and mobile communication technologies, many studies on healthcare system are being carried out. In this paper, we have designed and implemented a mobile u-Healthcare system based on sensor network. The u-Healthcare system is composed of three components: wireless sensor network at home, healthcare center located at remote site, and gateway which relays sensing physiological signals to healthcare center. In order to measure patient's physiological signal three sensors are used: three channel ECG sensor, pulse oximeter, and blood pressure sensor. Each sensor is mounted on a mote which can send gathered signal to the base node using Zigbee communication protocol. Once the base node receives physiological signal from each sensor, the client in the base node transfers the signal to the healthcare center. The received physiological signal at the healthcare center is analyzed and processed using various algorithms. The processed results are compared to the standard healthcare database and appropriate treatment including dietetics and exercise cure would be sent to the patient as feedback using SMS message or healthcare center web site. Each patient can check and manage one's health state every day using the healthcare system and gain a recovery under the treatments from minor health problems.

• Journal of Life Science
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• v.28 no.5
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• pp.621-626
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• 2018

We introduced the physiological responses of aging, active aging and also suggest the impact of physical exercise on body health status and elderly immunity. In this purpose, we searched the Pub Med data base for the articles (include our experimental papers) and review papers having the terms 'Aging', 'Active aging' and 'Physical activity and elderly' in the title, published from 1999 until 2018. The results were as follows: Exercise training has been extensively studied about the reduction of inflammation, oxidative stress, disease, and aging in syndrome X patients and elderly. Combined and aerobic or resistance exercise training could reduce obesity, insulin resistance, type 2 diabetes and hypertension. Exercise training has been extensively studied in cancer settings as part of prevention or treatment strategies. From this research, regular exercise has the potential to target tumor growth through regulation of inflammation and immune responses such as lactate clearance, NK cell activation (innate immunity), activation of cytotoxic immune cells, T cell activation (adaptive immunity), and immune surveillance. However, Endurance physical activity not only induces thermogenesis and diverse sports injuries but also elicits mobilization and functional enhancement of monocytes, neutrophils (which is caused by the cytokine changes such as TNF-alpha, IL-1) whereas it suppresses cell mediated immunity causing to increased susceptibility to inflammation and infections like cough and URTIs (upper respiratory track infections) in young and especially in elderly people. Therefore, Strategies to prevent physical fatigue, sports injuries include avoid overtraining, Adequate recovery and various type of rest during and after physical activity and assuring adequate nutrition supplementation such as glutamine, vitamin B, vitamin C, carbohydrate, ion or berry-contain sports beverages is helpful in physically active elderly.

• Journal of the Korean Society of Propulsion Engineers
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• v.15 no.3
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• pp.31-39
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• 2011

The flowfield in a solid rocket motor was simulated at the wall-injection test model, which has a fin-slot grain and submerged nozzle, and visualized by a smoke-wire. The high speed CCD camera captured the visualized images around the nozzle inlet through the grain center port. The vortical tube structure and circumferential flow patterns at the nozzle throat were visualized. The radial momentum transfer caused by the shear-interactions of slot-outlet flow, fin-base flow and grain port flow from upstream worked as the source of these phenomena.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.12
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• pp.8966-8976
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• 2015

Unshielded posts on roadside are a critical hazard to the safety of impact vehicle to the posts. A crashworthy post is developed. In the first phase, it dissipates the impact energy by the linear momentum conservation principle while the plastic impact between the post and vehicle takes place, then, the second phase dissipation follows by the deformation of the energy absorbing modules embedded in the guide trough of the foundation. Simulations of impacts to a rigidly connected post and crashworthy post were made using LS-DYNA program, which demonstrated the danger of unshielded rigidly connected post and the effectiveness of the proposed crashworthy post to the 0.9ton-80km/h impact.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.40 no.5
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• pp.445-454
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• 2020

Non-breakaway crashworthy sliding posts move rigidly with a vehicle in the early stage of vehicle impact. During this stage, a vehicle imparts its linear momentum to the post, experiencing first-stage speed loss followed by second-stage loss from the crush of the energy-absorbing pipe (EAP) installed under the guide rail. An EAP is the key element of a crashworthy sliding post and should be confined to the post foundation. This paper covers the development of an EAP for a sliding post of 507 kg, which is a sliding post type frequently used in Korea for cantilever signs. Detailed explanations of the designs for an EAP structure using LS-DYNA impact simulation are given, and the crashworthiness of the systems are confirmed through crash tests. The EAP presented in this paper can accommodate impacts from 0.9 ton-60 km/h to 1.3 ton-80 km/h, and is applicable to foundations up to 2.7 m in length.

• The Journal of the Korea Contents Association
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• v.13 no.6
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• pp.318-330
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• 2013

The purpose of this study was to present results and methods of occupational therapy for children with cerebral palsy using systematic review. This study was searched form papers published from Jan, 2003 to Dec, 2012 using PubMed E-Data base. Key words using on the search were 'occupational therapy' OR 'exercise therapy' OR 'activities of daily living' OR 'splints' OR 'self-help devices' OR 'early intervention(education)' OR 'parents/education' OR 'parents/psychology' OR 'professional family relations' OR 'play and playthings' OR 'upper extremity' AND 'cerebral palsy'. Eighteen studies were included in this review. Methods on occupational therapy for children with cerebral palsy were splint 26.2%, parent education 26.2%, environmental modification 9.6%, training of sensorimotor function 19.0%, activities of daily living 19.0%. Results on occupational therapy for children with cerebral palsy were significant difference on splint 40.0%, parent education 42.9%, environmental modification 40.0%. Results of this study will provide evidences based on occupational therapy.

• Journal of Korean Library and Information Science Society
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• v.41 no.2
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• pp.273-295
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• 2010

Germany has started restitution process for most of collections from its occupied countries after World War II which was strongly led by the United Nations. However, this process did not include many of the plundered Jewish collections. In 1989, restitution for the Jewish's properties confiscated by the Nazis became important international issue with success in Jewish material claims against Germany in the U.S and Europe countries after German unification. German libraries has still possessed collections sequestered by the Nazis from 1933 to 1945. With Washington conference on holocaust-era assets in 1998, libraries began to sympathize with restoration of their Jewish confiscated collections. In present, by identifying the provenance of those collections at primary level, German librarians focus on various restitution activities for those collections in order to introspect and overcome their past. Specifically, the libraries publish the practical guidebook of studies on the provenance identification and open the database for the pillaged collections to the public. Few libraries start to restore the collections, but the numbers of the restituted collections are still insignificant.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.30 no.6
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• pp.1-6
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• 2002

Micro engine that includes Micro scale combustor is fabricated. Design target was focused on the observation of combustion driven actuation in MEMS scale. Combustor design parameters are somewhat less than the size recommended by feasibility test. The engine structure is fabricated by isotropic etching of the photosensitive glass wafers. Electrode is formed by electroplating of the Nickel. Photosensitive glass can be etched isotropically with almost vertical angle. Bonding and assembly of structured photosensitive glass wafer from the engine. Combustor size was determined to be 1mn scale. Piston in cylinder moves by fuel injection and reaction. In firing test, adequate engine operation including ignition, flame propagation and piston motion was observed. Present study warrants further application research on MEMS scale internal combustion power units.