• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2006년도 춘계학술대회논문집
• /
• pp.332-339
• /
• 2006

A leaf spring suspension has been widely used since it can carry big load and simplicity. But one major drawback is the poor ride performance because of the friction in the system and the high stiffness coefficient. To overcome these, air spring suspension can be used. The air spring suspension system can improve the ride of the heavy vehicle significantly and also it can adjust the height to the loading and unloading. A truck with the leaf suspension system is modified with the air suspension system and the performance of the vehicle is compared using the suggested method. The existing leaf suspension can be replaced with the air suspension system to improve the performance.

• 한국정보과학회:학술대회논문집
• /
• 한국정보과학회 2011년도 한국컴퓨터종합학술대회논문집 Vol.38 No.1(C)
• /
• pp.236-239
• /
• 2011

품사 태깅에서 오류는 같은 가중치를 가지는 것으로 간주되어 왔다. 하지만 품사 태깅의 결과를 활용하는 다른 자연어 처리 기술에 태깅 오류가 얼마나 영향을 미칠 수 있는가에 따라 품사 태깅 시 발생하는 오류가 가지는 가중치를 다르게 보아야 한다. 심각한 오류는 이를 활용하는 자연어 처리 기술의 성능 저하를 크게 야기하지만, 사소한 오류는 성능의 저하를 야기하지 않거나 그 영향이 미미하다. 본 논문에서는 품사 태깅 시, 전체적인 성능을 유지하면서 심각한 오류를 줄이는 것을 목표로 한다. 이를 위해 두 가지 점진적 손실 함수(gradient loss function)를 제안한다. 제안한 손실 함수는 심각한 오류에 사소한 오류보다 더 큰 가중치를 줌으로써 품사 태깅 모델이 심각한 오류에 더 집중하여 성능을 최적화하도록 한다. 실험에서 제안한 손실 함수를 활용한 태깅 모델은 기존의 방법에 비해 심각한 오류를 효과적으로 줄일 뿐만 아니라 전체적으로 더 높은 정확도를 보였다.

• 한국정보과학회:학술대회논문집
• /
• 한국정보과학회 2007년도 가을 학술발표논문집 Vol.34 No.2 (D)
• /
• pp.589-592
• /
• 2007

CoSlide 협업 시스템은 웹데브 기반의 CoSlide 서버와 윈도우즈 응용프로그램인 CoSpace 클라이언트로 구성된다. CoSlide 서버는 Jakarta Slide 서버의 확장으로 협업시스템 구성원간의 자원 공유를 위한 다양한 종류의 작업장을 지원하며, CoSpace 클라이언트는 CoSlide 서버의 다양한 기술 지원을 사용자 중심의 인터페이스로 제공한다. 협업을 동적으로 지원하기 위해서는 워크플로우 시스템이 필요하다. 워크플로우 시스템은 협업시스템에 등록된 사용자가 워크플로우가 정의된 작업장에 자원을 등록하였을 때 정의된 워크플로우에 따라서 자원의 이동, 복사 그리고 메시지전송 등의 과정을 자동적으로 수행한다. 워크플로우 정의는 XML 파일 형식으로 워크플로우 작업장에 생성되어 존재하며 반응적 워크플로우가 발생하였을 때 XML 파일의 정의에 따라 자동적으로 이뤄진다. 협업 시스템에 워크플로우 시스템을 적용시키면 협업 시스템에 등록된 자원을 수동으로 분류하거나 협업에 필요한 다른 그룹의 특정 사용자에게 수동으로 전송해야 하는 불편함을 없앨 수 있다.

• Journal of Information Display
• /
• 제11권2호
• /
• pp.84-90
• /
• 2010

This paper presents the effects of a dielectric layer and an electrolyte on the driving performance of an electrowetting on dielectric (EWOD)-based liquid lens. The range of tunable focal length of the EWOD-based liquid lens was highly dependent on the conditions of the dielectric layer, which included an inorganic oxide layer and an organic hydrophobic layer. Moreover, experiments on the physical and optical durability of electrolyte by varying temperature conditions, were conducted and their results were discussed. Finally, the lens with a truncated-pyramid silicon cavity having a sidewall dielectrics and electrode was fabricated by anisotropic etching and other micro-electromechanical systems (MEMS) technologies in order to demonstrate its performance. The lens with $0.6-{\mu}m$-thick $SiO_2$ layer and 10 wt% LiCl-electrolyte exhibited brilliant focal-length tunability from infinity to 3.19 mm.

• 수산해양교육연구
• /
• 제25권1호
• /
• pp.40-52
• /
• 2013

The purpose of this study is to explore improving ways of screening of self-directed learning in self-governing high schools for expanding self-initiated learning screening system. To achieve the above aim, it was used survey method to 99 admission teachers of 12 self-governing high schools and analyzed responses with SPSS program. The research findings are as follows. To expand self-initiated learning screening system in self-governing high schools, it needs to obtain admission members of entrance committee, pooling of external screening members, quick decision of school admission members, increasing payment, training and understanding of the system and consideration of admission documents and study plan. Some improving ways of the expanding of self-initiated learning screening may be listed as follows: 1) development of screening model for self-governing schools 2) policy consideration for self-governing public high school 3) expanding autonomy of school 4) supporting budget 5) sharing of operation case and reinforcement of public relations.

• 한국태양에너지학회:학술대회논문집
• /
• 한국태양에너지학회 2011년도 추계학술발표대회 논문집
• /
• pp.226-231
• /
• 2011

This study set out to review the air current fluidity in exhaust common ducts by installing an inlet pipe at a leisure space in the PS(Pipe Shaft)room for the sake of wind power generation with kitchen and bathroom exhaust common ducts of all the equipment and air conditioning shafts in high-rise apartment. The air current functionality of kitchen and bathroom exhaust common ducts was reviewed by analyzing wind velocity changes according to changes to the area of exhaust common ducts through a simulation, changes to the wind velocity of the kitchen hood by applying an external inlet pipe, changes to the usage factor of exhaust common ducts, and changes to wind velocity by altering the form of the ventilator at the bottom of the old exhaust common duct. It was a basic study on the utilization of exhaust wind velocity in exhaust common ducts.

• 설비공학논문집
• /
• 제18권12호
• /
• pp.977-983
• /
• 2006

Experimental results for heat transfer characteristic and pressure gradient of hydrocarbon refrigerants (R-290, R-600a, R-1270) and HCFC refrigerant (R-22) during condensation inside horizontal double pipe heat exchangers are presented. The test sections which have one tube diameter of 12.70 mm with 0.89 mm, 9.52 mm with 0.76 mm, 6.35 mm with 0.13 mm wall thickness are used for this investigation, respectively. The local condensing heat transfer coefficients of hydrocarbon refrigerants were higher than those of R-22. The average condensing heat transfer coefficient increased with the increase of the mass flux. It showed the higher values in hydrocarbon refrigerants than R-22. Hydrocarbon refrigerants have higher pressure drop than R-22 in 10.92 mm, 8 mm and 6.1 mm inner diameters. These results from the investigation can be used in the design of heat transfer exchangers using hydrocarbons as the refrigerant for the air-conditioning systems.

• Journal of Dental Anesthesia and Pain Medicine
• /
• 제16권2호
• /
• pp.137-140
• /
• 2016

Spinal muscular atrophy (SMA) is an autosomal recessive, severe neuromuscular disorder in which degeneration of alpha motor neurons in the spine progressively weakens and ultimately paralyzes the proximal muscles. It occurs in one per 6,000-10,000 infants, and is a genetic disorder with the second-highest mortality rate worldwide. An 18-year-old male patient with SMA was referred for general anesthesia for difficulty in performing dental treatment due to limited mouth opening caused by temporomandibular joint (TMJ) pain. However, the patient had a high risk of general anesthesia complications, so TMJ pain during mouth opening was reduced through local anesthesia of the TMJ. Fortunately, the anesthesia was successful in reducing pain during mouth opening, enabling the patient to receive dental treatment with an adequate mouth opening.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
• /
• pp.258-258
• /
• 2008

Among several available high-k dielectrics the lanthanum zirconium oxide ($LaZrO_x$) system is very attractive as a buffer insulating layer. Because both lanthanum and zirconium atoms, the constituents of the $LaZrO_x$ thin film, have been considered to be thermally stable in contact with Si. The $LaZrO_x$ films were deposited by a sol-gel method. After the deposition, The $LaZrO_x$ films were crystallized at $750^{\circ}C$ for 30 minutes in $O_2$ ambient. PVDF-TrFE films were deposited on these $LaZrO_x$/Si structures using a sol-gel technique. The sol-gel solution was spin-coated on $LaZrO_x$/Si structures at 500 rpm for 5 sec and 2500 rpm for 15 sec. The deposited layer was dried at $165^{\circ}C$ for 30 min in air on a hot-plate. Then, we deposited Au electrode on PVDF-TrFE films using thermal evaporation.

• ETRI Journal
• /
• 제33권4호
• /
• pp.611-620
• /
• 2011

Since card-type one-time password (OTP) generators became available, power and area consumption has been one of the main issues of hardware OTPs. Because relatively smaller batteries and smaller chip areas are available for this type of OTP compared to existing token-type OTPs, it is necessary to implement power-efficient and compact dedicated OTP hardware modules. In this paper, we design and implement a low-power small-area hardware OTP generator based on the Advanced Encryption Standard (AES). First, we implement a prototype AES hardware module using a 350 nm process to verify the effectiveness of our optimization techniques for the SubBytes transform and data storage. Next, we apply the optimized AES to a real-world OTP hardware module which is implemented using a 180 nm process. Our experimental results show the power consumption of our OTP module using the new AES implementation is only 49.4% and 15.0% of those of an HOTP and software-based OTP, respectively.