• Asian Pacific Journal of Cancer Prevention
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• 제17권11호
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• pp.4951-4957
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• 2016

Background: Apart from reducing occupational exposure to cytotoxic hazards, the PhaSeal(R) closed-system transfer device (CSTD) can extend the beyond-use dates (BUDs) of unfinished vials of antineoplastic drugs for up to 168 hours (seven days). In this study, the total material cost incurred by its use in a Malaysian government-funded hospital was calculated. Methods: A list of vial stability following initial needle punctures of 29 commonly-used antineoplastic drugs was compiled. The amount of the materials used, including drugs, infusion bottles, the PhaSeal(R) CSTD and other consumables, was recorded on a daily basis for three months in 2015. The total cost was calculated based on the actual acquisition costs, and was compared with that of a hypothetical scenario, whereby conventional syringe-needle sets were used for the same amounts of preparations. Results: The use of the PhaSeal(R) CSTD incurred a cost of MYR 383,634.52 (USD 92,072.28) in three months, representing an average of MYR 170.5 (USD 40.92) per preparation or an estimated annual cost of MYR 1,534,538.08 (USD 368,289.14). Compared with conventional syringe-needle approach, it is estimated to lead to an additional spending of MYR 148,627.68 (USD 35,670.64) yearly. Conclusion: Although there was a reduction of drug wastage achieved by extending BUDs of unfinished vials using the PhaSeal(R) CSTD, cost saving was not observed, likely attributable to the wide use of lower-priced generic drugs in Malaysia. Future studies should further evaluate the possibility of cost saving, especially in health settings where branded and high-cost antineoplastic drugs are more commonly used.

• 한국컴퓨터정보학회논문지
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• 제25권7호
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• pp.1-8
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• 2020

본 논문에서는 군용시험장비로 개발된 시험용 영상생성/수집 장치에 XDMA를 활용하여 고속 이미지 데이터 전송을 구현한다. 본 연구에서 제안하는 기술은 커널영역에서 시스템버퍼를 사용하여 데이터를 복사하는 방법을 FPGA내 DMA 엔진을 통한 송수신으로 대체하여 효율성을 얻는다. 본 연구를 위해 장치는 Life Cycle을 고려하여 PXIe 플랫폼으로 개발하였으며, 양산성을 고려하여 저가의 FPGA를 활용하여 퍼포먼스를 최대화하였다. 본 논문에서 구현한 영상입출력보드는 기존의 메모리복사방식을 통해 AXI 인터페이스 클럭 주파수, 링크속도를 변경하여 시험하였다. 그리고 FPGA의 DMA 엔진을 사용하여 보드를 구성하였으며, 그 결과 전송속도는 기존의 5~8Hz에서 140Hz로 증가함을 확인하였다. 제안된 방법은 PXIe 플랫폼을 이용한 장치개발의 비용절감, 기술수준을 높여 국방력 강화에 기여할 것이다.

• 한국전자통신학회논문지
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• 제15권3호
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• pp.413-420
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• 2020

군 전술정보통신체계(TICN: Tactical Information and Communication Network)는 이동기지국시스템(MSAP: Mobile Subscriber Access Point)을 활용하여 음성 및 데이터 등 실시간 멀티미디어 서비스를 제공한다. 이때 소용량 무선전송체계와 대용량 무선전송체계를 통해 외부전송로를 구성하게 된다. 각 무선전송체계의 통신기기들은 전술차량에 탑재되고 전술차량에 공급전원이 통합전원제어장치로 절체 될 때 전원차단을 예방하기 위해 2차전지가 사용된다. 본 논문은 이동기지국시스템 통합제어장치 배터리 충전용 무선전력전송기기를 장하분배법을 이용하여 기본 설계하고 공극에 의한 설계 변수인 1차 측 권선 수와 코어 재질선정을 FEM(Finite Elements Method) 해석을 통해 확인하였다.

• 전기전자학회논문지
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• 제27권3호
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• pp.265-272
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• 2023

본 논문에서는 FMCW(Frequency Modulated Continuous Wave) SAR(Synthetic Aperture Radar) 기반 실시간 영상 형성을 위해 RDA(Range Doppler Algorithm)의 GPU 가속 커널을 개발하였다. Host와 GPU device 사이의 데이터 전송 시간을 최소화하기 위해 pinned 메모리를 사용하였고, 데이터의 전송 횟수를 최소화하기 위해 모든 RDA 연산을 GPU에서 수행하도록 커널을 구성하였다. FMCW 드론 SAR 실험을 통해 데이터셋를 획득하였고, intel i7-9700K CPU, 32GB RAM과 Nvidia RTX 3090 GPU 환경에서 GPU의 가속 효과를 측정하였다. Host-device간 데이터 전송 시간을 포함했을 경우 CPU 대비 최대 3.41배 가속된 것으로 측정되었고, 데이터 전송 시간을 포함하지 않고 연산의 가속 효과만을 측정했을 때, 최대 156배 가속 가능함을 확인할 수 있었다.

• 구강회복응용과학지
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• 제39권3호
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• pp.176-185
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• 2023

조절성 교합기에 모형을 부착하기 위하여 안궁이전이 필요하다. 아날로그 안궁이전에서는 장비의 정확도와 작업자의 숙련도가 모형 부착 결과에 영향을 미칠 가능성이 있다. 더불어 편차가 큰 방법으로 부착된 작업 모형에서는 정확한 치과 보철물의 제작이 어려우므로, 아날로그 안궁이전으로 부착된 작업 모형의 위치 편차를 파악하는 것이 중요하다. 본 증례에서는 아날로그 안궁이전으로 부착된 상악 모형의 위치와 cone beam computed tomography 데이터를 기반으로 위치된 상악 모형의 위치를 거리 편차와 교합 평면의 각도 편차를 평가하였다. 이를 토대로 아날로그 안궁이전으로 부착된 상악 모형의 편차를 보고하였다. 아날로그 안궁이전 방법은 3 - 16 mm의 선형 편차와 5 - 7도의 교합평면 각도 편차를 가지는 상악 모형의 부착 결과를 나타내었다. 아날로그 안궁이전은 환자별로 위치 편차가 다를 수 있음을 확인했으며, 치과 보철물 제작에서의 부정확성을 초래할 가능성이 있다. 이러한 결과는 임상에서 아날로그 안궁이전 방법이 상악 모형을 부착하는 과정에서 큰 편차가 있을 수 있음을 나타내었기에 이를 보고하는 바이다.

• 설비공학논문집
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• 제17권11호
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• pp.1022-1027
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• 2005

An experimental study is conducted to investigate the characteristics of the ion wind generated by the electric field between a needle electrode and the parallel plate electrodes. The ion wind enhances heat and mass transfer between the surface and the surrounding gas. Moreover such enhancement makes no noise or vibration. This study is conducted to develop the electronic cooling device. The measured gas velocities and heat transfer coefficients are proportional to the applied voltage. The heat transfer coefficient can be increased as compared with a natural convection. The maximum enhancement of heat transfer obtained in this system is $47\%$ for 3 W in heat transfer rate.

• 대한기계학회논문집B
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• 제20권10호
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• pp.3344-3354
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• 1996

An experimental and numerical study on the three-dimensional natural convection-radiation conjugate heat transfer in the enclosure with heat generating chip has been performed. A 3-dimensional simulation model is developed by considering heat transfer phenomena by conduction-convection and radiation. Radiative transfer was analyzed with the discrete ordinates method. Experiments are conducted in order to validate the numerical model. Comparisons with the experimental data show that good agreement is obtained when the radiation effect is considered. The effects of the thermal conductivity of the substrate and power level on heat transfer are investigated. It is shown that radiation is the dominant heat transfer mode and the conductivity of the substrate has important effects on the heat transfer in the enclosure.

• 대한산업공학회지
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• 제41권6호
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• pp.551-558
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• 2015

The purpose of this paper is to investigate the development of mechanical projectile transfer system to prevent musculoskeletal problems in the firing test range. Prior to 2010, the projectile has been transferred from the worktable to the loading device of 155mm K9 fixed-type artillery by manual. Because the amount of firing test has been increased drastically since 2010, two types of mechanical projectile transfer system were developed to prevent musculoskeletal problems. The NIOSH lift equation and the working posture assessment system such as OWAS, RULA and REBA were used to evaluate the appropriacy of working weight and posture by manual transfer of projectile. The configuration and operation procedure of projectile transfer systems which were developed to improve work efficacy and to reduce the burden of manual transferring were described. The improvements were assessed by the number of processes, the tact time and the working posture assessment for operation of this system by comparing to the manual transfer of projectile.

• JSTS:Journal of Semiconductor Technology and Science
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• 제12권2호
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• pp.240-253
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• 2012

In this paper we propose a protection mechanism for the debug port. While debug ports are useful tools for embedded device development and maintenance, they can also become potential attack tools for device hacking in case their usage is permitted to hackers with malicious intentions. The proposed approach prevents illicit use of debug ports by controlling access through user authentication, where the device generates and issues authentication token only to the server-authenticated users. An authentication token includes user access information which represents the user's permitted level of access and the maximum number of authentications allowed using the token. The device authenticates the user with the token and grants limited access based on the user's access level. The proposed approach improves the degree of overall security by removing the need to expose the device's secret key. Availability is also enhanced by not requiring server connection after the initial token generation and further by supporting flexible token transfer among predefined device groups. Low implementation cost is another benefit of the proposed approach, enabling it to be adopted to a wide range of environments in demand of debug port protection.

• 설비공학논문집
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• 제15권5호
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• pp.432-438
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• 2003

This paper describes a modified Roebuck compression device as a potential compression device of a rotating cryogenic refrigeration system in superconducting machine such as generator or motor. The conventional cryogen transfer method from stationary refrigeration system to rotating system can be eliminated by an on-board cryogenic refrigeration system that utilizes well-designed multi-stage modified Roebuck compression device. This paper shows basic thermodynamic analysis of modified Roebuck compression device and its application for compressing neon at 77 K with substantial pressure ratio when the rotor diameter is 0.8 m with rotating speed of 3600 rpm. The device does not require any moving part in rotating frame, but two separate thermal reservoirs to convert thermal energy into mechanical compression work. The high temperature thermal reservoir is atmospheric environment at 300 K and the low temperature thermal reservoir is assumed as a liquid nitrogen bath at 77 K. The concept of the compression device in this paper demonstrates its usefulness of generating high-pressure neon at 77 K for rotating J-T neon refrigeration cycle of superconducting rotor.