• Title/Summary/Keyword: Cab

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Evaluation of thermally and chemically reduced graphene oxide films as counter electrodes on dye-sensitized solar cells

  • Rodriguez-Perez, Manuel;Villanueva-Cab, Julio;Pal, Umapada
    • Advances in nano research
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    • v.5 no.3
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    • pp.231-244
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    • 2017
  • Graphene oxide (GO) was prepared by modified Hummer's method to produce reduced graphene oxide (RGO) following standard thermal and chemical reduction processes. Prepared RGO colloids were utilized to fabricate RGO films over glass and FTO coated glass substrates through drop-coating. A systematic study was performed to evaluate the effect of reduction degree on the optical and electrical properties of the RGO film. We demonstrate that both the reduction process (thermal and chemical) produce RGO films of similar optical and electrical behaviors. However, the RGO films fabricated using chemically reduced GO colloid render better performance in dye sensitized solar cells (DSSCs), when they are used as counter electrodes (CEs). It has been demonstrated that RGO films of optimum thicknesses fabricated using RGO colloids prepared using lower concentration of hydrazine reducer have better catalytic performance in DSSCs due to a better catalytic interaction with redox couple. The better catalytic performance of the RGO films fabricated at optimal hydrazine concentration is associated to their higher available surface area and lower grain boundaries.

E-mail System Implementation for Standardization of E-mail Address Internationalization (다국어 전자 메일 주소 표준화를 위한 메일 시스템 구현)

  • Yeom, Dae-Young;Han, Dong-Yun;Kim, Kyong-Sok
    • Journal of Korea Multimedia Society
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    • v.13 no.2
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    • pp.265-278
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    • 2010
  • Most recent E-mail systems, that are serviced in Korea, are supporting Hangul in many fields of E-mail(For example, contents, subject, attachment, etc.). However, these systems do not support Hangul in the address field of E-mail. In 2003, IDNA built the international standard in order to support multi-lingual besides the alphabetic character, a number, and '-'. So, Hangul cab be used in the domain part where is the right of '@' mark among the compositional element of the E-mail address. But, the local-part, where is the left of '@' mark, doesn't still support multi-lingual. So Hangul cannot be used in the local-part. In order to support multi-lingual including Hangul in the local-part, this paper designs and implements the E-mail system according to the EAI standardization research that it is progressed in IETF.

Development of the Computer Model Considering Flexible Effect of a Large-sized Truck on the Bump Road (범프 로드에서 대형트럭 프레임의 탄성효과를 고려한 컴퓨터 모델 개발)

  • Moon, Il-Dong;Chi, Chang-Hun;Kim, Byoung-Sam
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.10 s.103
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    • pp.1202-1210
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    • 2005
  • This paper develops a computer model for estimating the bump characterisitcs of a cat)over type large-sized truck. The truck is composed of front and rear suspension systems, a frame, a cab, and ten tires. The computer model is developed using MSC.ADAMS. A shock absorber, a rubber bush, and a leaf spring affect a lot on the dynamic characteristic of the vehicle. Their stiffness and damping coefficient are measured and used as input data of the computer model. Leaf springs in the front and rear suspension systems are modeled by dividing them three links and joining them with joints. To improve the reliability of the developed computer model, the frame is considered as a flexible body. Thus, the frame is modeled by finite elements using MSC.PATRAN. A mode analysis is performed with the frame model using MSC.NASTRAN in order to link the frame model to the computer model. To verify the reliability of the developed computer model, a double wheel bump test is performed with an actual vehicle. In the double wheel bump, vortical displacement, velocity, acceleration are measured. Those test results are compared with the simulation results.

A Study on the Effect of Cab Signal through Unbalance of the Traction Return Current (귀선전류의 불평형에 따른 차상신호에 미치는 영향에 관한 연구)

  • Lee, Tae-Hoon;Park, Ki-Bum;Sung, Soon-Uk
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.1694-1700
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    • 2007
  • In the electrified section, both of return current and signal current are flowing in the same rail in common. But signal current shall be allowed to flow in the specific track circuit and not in the other circuit while the traction return current shall come back to power sub-station. This paper presents measuring system that use both sensor and antenna. The aim of the system is to achieve the difference in current between the two rails and the presence of trimming capacitors. In order to improve the transmission level, trimming capacitors are connected between the two rails at constant spacing. To maintain the balance of traction return current, rails of both sides may be jointed by the so-called SVPMM. The traction return current is sometimes unbalanced owing to the ill-contact of SVPMM. In this paper, we propose a diagnosis method based on a short-circuited current(Icc), trimming capacitors and traction return current measured by Korail inspection vehicles. Whether Icc is good or bad depends not only on the presence of trimming capacitors but also on the unbalance of the traction return current.

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A Study on Improvement of PSD Interface Using 2.4GHz Wireless Communication, (2.4GHz 무선 통신을 이용한 PSD 인터페이스 개선에 관한 연구)

  • Kim, Jae-Pil;Hyun, Yong-Sub;Chang, Kyong-Song
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.1408-1415
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    • 2007
  • To operate Platform Screen Door (PSD) automatically, the operational data of PSD and the train must be interfaced properly. PSD and train are operated together by the signaling system in Automatic Train Operation (ATO) signaling system zone where interfaces are provided between PSD and train. However, the additional PSD interface system with train is required in train operating zone without the interface between PSD and train. For the PSD interface, the wireless communication system or the train status (train correct stop status / train door status) detection system has been used. Seoul Metro line No.2. has the PSD wireless communication system using 447MHz band RF. For the safety of PSD operation, it is required to prevent RF interference in the subway environment where many frequencies exist. In this paper, the PSD wireless communication system is developed using 2.4GHz band RF to prevent the interference of the wireless communication and increase the traffic of the PSD interface. Furthermore, the improved system can store, manage and display the PSD and train operational data using Human Machine Interface (HMI) in the train's driver cab.

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External Iliac Artery Transection Managed by Iliofemoral Bypass Grafting Using Temporary Balloon Occlusion

  • Choi, Young Un;Lee, Jae Gil;Kim, Kwangmin;Kim, Seongyup;Bae, Keumseok;Jang, Ji Young;Jung, Pil Young;Shim, Hongjin;Youn, Young Jin;Park, Il Hwan
    • Journal of Trauma and Injury
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    • v.30 no.4
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    • pp.242-246
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    • 2017
  • Traumatic abdominal vessel injury is rare, but difficult to manage. Approaching the injured vessel and controlling the bleeding is very hard. We experienced the right iliac artery transection managed by iliofemoral bypass grafting using temporary balloon occlusion. Proximal occlusion of an iliac artery with a temporary balloon cab be an option or bridge technique for a definite operation in case of iliac artery rupture. So, we present our case.

Targeted Silencing of Inhibitors of Apoptosis Proteins with siRNAs: A Potential Anti-cancer Strategy for Hepatocellular Carcinoma

  • Li, Gang;Chang, Hong;Zhai, Yun-Peng;Xu, Wei
    • Asian Pacific Journal of Cancer Prevention
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    • v.14 no.9
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    • pp.4943-4952
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    • 2013
  • Hepatocellular carcinoma (HCC) is one of the most common malignancies, with a very poor prognosis. Despite significant improvements in diagnosis and treatment in recent years, the long-term therapeutic efficacy is poor, partially due to tumor metastasis, tecurrence, and resistance to chemo-or radio-therapy. Recently, it was found that a major feature of tumors is a combination of unrestrained cell proliferation and impaired apoptosis. There are now 8 recogized members of the IAP-family: NAIP, c-IAP1, c-IAP2, XIAP, Survivin, Bruce, Livin and ILP-2. There proteins all contribute to ingibition of apoptosis, and provide new potential avenues of cancer treatment. As a powerful tool to suppress gene expression in mammalian cells, RNAi species for inhibiting IAP genes cab be directed against cancers. This review will provide a brief introduction to recent developments of the application IAP-siRNA in tumor studies, with the aim of inspiring future treatment of HCC.

An Electronic Step-Down Transformer with Voltage Stabilization Characteristics for Custom Power (전압 안정화 특성을 갖는 수용가용 전자식 강압형 변압기)

  • 최남섭;강정식
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2001.05a
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    • pp.423-426
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    • 2001
  • In this paper, an electronic step-down transformer with output voltage stabilization characteristics is presented. The proposed electronic transformer has some advantages and features as follows: 1) It has 40 % weights lighter than that of commercial magnetic transformer, 2) It has output voltage stabilization characteristic with regulated output voltage over input variations, 3) It cab be operated as circuit breaker in the case of emergency, 4) It can be operated with so called soft starting function. Moreover, the electronic transformer may have stand-by power cutoff function and act as distortion compensator. This paper show the circuit diagram and present its features through various PSPICE simulations.

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Computation for Deformation Modes of a Flexible Body in Multibody System using Experimental Modal Analysis (실험적 모드해석을 이용한 다물체계내 유연체의 변형보드 계산)

  • Kim, Hyo-Sig;Kim, Sang-Sup
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1718-1723
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    • 2003
  • This paper presents a computational method for deformation modes of a flexible body in multibody system from the experimental modal analysis and an efficient method for flexible multibody dynamic analysis by use of the modes. It is difficult to directly use experimental modal parameters in flexible multibody dynamic analysis. The major reasons are that there are many inconsistencies between experimental and analytical modal data and experimental noises are inherent in the experimental data. So two methods, such as, a method for ortho-normalization of experimental modes and the other one for mode expansion, are suggested to gain deformation modes of a flexible body from the experimental modal parameters. Using the virtual work principle, the equation of motion of a flexible body is derived. The effectiveness of the proposed method will be verified in the numerical example of cab vibration of a truck by comparing analysis and test results.

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MICOWAVE PLASMA BURNER

  • Hong, Yong-Cheol;Shin, Dong-Hun;Lee, Sang-Ju;Jeon, Hyung-Won;Lho, Taihyeop;Lee, Bong-Ju
    • Proceedings of the Korean Vacuum Society Conference
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    • 2010.08a
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    • pp.95-95
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    • 2010
  • An apparatus for generating flames and more particularly the microwave plasma burner for generating high-temperature large-volume plasma flame was presented. The plasma burner was composed of micvrowave transmission lines, a field applicator, discharge tube, coal and gas supply systems, and a reactor. The plasma burner is operated by injecting coal powders into a 2.45 GHz microwave plasma torch and by mixing the resultant gaseous hydrogen and carbon compounds with plasma-forming gas. We in this work used air, oxygen, steam, and their mixtures as a discharge gas or oxidant gas. The microwave plasma torch can instantaneously vaporize and decompose the hydrogen and carbon containing fuels. It was observed that the flame volume of the burner was more than 50 times that of the torch plasma. The preliminary experiments were carried out by measuring the temperature profiles of flames along the radial and axial directions. We also investigated the characteristics for coal combustion and gasification by analyzing the byproducts from the exit of reactor. As expected, various byproducts such as hydrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, etc. were detected. It is expected that such burner cab be applied to coal gasification, hydrocarbon reforming, industrial boiler of power plants, etc.

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