• Fire Science and Engineering
• /
• v.26 no.1
• /
• pp.96-101
• /
• 2012

The buildings of domestic wear the upper floors and an underground in-depth reconciliation tendency to do and the possibility of fire occurrence at the time of formation accident is coming to be high. Therefore will be scattered to various place and is established and prevention of disaster information of the receiver which will integrate there is a necessity which will manage. In this paper away where each receiver is installed in the fire for the remote monitoring and controld able to connect to the Internet and fiber optic cable that can be networked fire receiver and control desk was constructed. Between each device can be used by the fire, and more depending on the status of monitoring and alarm, control and maintenance can be performed to develop an integrated management system. The system is evaluated by the criteria of the KFI, and for each segment of the signal propagation time to perform experiments confirmed the reliability of the performance.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.26 no.10B
• /
• pp.1343-1352
• /
• 2001

DWDM 전송 시스템에서 전송 용량 증대를 위하여 bit rate를 고속화하고 채널 간격을 줄이기 위해서는 전송로로 사용되는 광케이블의 분산특성이 상반되는 값을 갖도록 요구된다. 즉, 분산으로 인한 신호 왜곡을 줄이기 위해서는 광케이블의 분산이 작아야 하고, 비선형 현상을 억제하기 위해서는 분산이 커야 한다. 이러한 두 가지 상반된 분산 penalty를 동시에 해결하기 위한 방안으로 양과 음의 분산 값이 이산적으로 분포된 광섬유 케이블을 최초로 설계 및 제작하였다. 이러한 분산 분포 케이블을 위해 일반 단일 모드 광섬유(SMF)와 대응되는 음분산 값을 갖는 새로운 광섬유(NDF)를 설계 및 제조한 후, SMF의 +17 ps/km/nm 및 NDF의 -15 ps/km/nm의 분산영역이 6km의 케이블 내에 분포되도록 케이블을 제작하였다. 새롭게 개발된 케이블의 분산 값을 국지적으로는 높은 값을 가지면서도 전체적으로는 1.0 ps/km/nm의 평균 분산 값으로 NZSDF 대비 30% 이하를 가질 수 있음을 확인하였다. 또한, 제안된 케이블은 SMF 케이블과 동일한 케이블 시공 운용 환경에서도 정합함을 확인하였다.

• Korean Journal of Digital Imaging in Medicine
• /
• v.6 no.1
• /
• pp.51-64
• /
• 2003

This thesis describes the effective interfacing methods of PACS Modality based on the system installation andoperating experiences. PACS(Picture Archiving and Communication Systems) is a system for medical image archiving and communication using large storage device and high-speed network. The standard communication protocol of PACS is DICOM(Digital Imaging and Communication in Medicine) based on TCP/IP and point-to-point protocol. However, there are many Non-DICOM Modalities and DICOM Modalities having problems. First, we had interfaced almost modalities. Fuji CR, GE CT, MRI, Angio, Fluoro, Phillips Angio, Shimadzu Fluoro. Ultrasound PACS, with the main PACS in the Seoul S Hospital as large scale hospital. And we manipulated the intelligent image distribution and the CT. MRI Interfaces never experienced beforein the Anyang J Hospital and the Chungju C Hospital as mid or small scale hospital. Technically, we developed both the DICOM Interface and the Non-DICOM Interface. At the last, the DICOM Worklist and the DICOM Print Interface were implemented in the Seoul B Hospital, the Bucheon SJ Hospital and the Seoul K Hospital independently with PACS. The Oracle, Sybase and MS-SQL are used as database, and UNIX, Macintosh, MS Windows as operating systems. And the Visual C++ and UNIX C are the main programming tools. We have used UTP, coaxial and fiber optic cable under 10/100 mbps LAN for networking.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.23 no.6
• /
• pp.1562-1574
• /
• 1998

We, in this paper, have implemented T1, E1 and fractional E1 HDSL(High-bit-rate digital subscriber line) function over an ATM switching system. The maxi$\mu$ loop lengths for subscriber service and cell loss rates to meet the bit error rate of 10$^{-7}$ at transmission of 2B1Q HDSL data E1 rate over existing telephone copper wires in the presence of the significant impairments such as NEXT(Nearned crosstalk), impulse noise, power line noise and longitudinal over the CSAs environment consisting of 26 gauge and 25 gauge unloaded copper telephone lines has assessed. HDSL will intially be used to serve private-DS1, ISDN-BRA, and DLC feeders, later DS1 extension from optic fiber cable. We also present market provision for the HDSL.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
• /
• v.2 no.2
• /
• pp.22-31
• /
• 2003

The existing training courses for the optical communication construction in even a college and the university, consist of simple cutting and connecting cable technique and the subjects are splitted into parts, to which can not be grasped in a whole. Now, it is strongly demanded that the educational curriculum involves the whole process of the optical communication system construction, which includes design, supervision and up to the fusion splice connection. In this paper, the essential training elements for the optic execution worker are investigated and suggested with the appropriating solution for the experiment room.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.18 no.5
• /
• pp.128-134
• /
• 2014

Recently, design and construction of street tunnels tend to focus on cost reduction and preservation of nature. Accordingly, research is actively being carried out to quickly detect fires when they occur in tunnels, which have partially closed structures. Among such research, fire detection methods using optical fiber sensors have a wide bandwidth and fast transmission speed, while using light as a medium. Therefore, it does not receive electrical interference and there is almost no loss of information during transmission, while also having little noise as well. In relation to this, a fire monitoring system that can accurately detect the location of fires in real time using shape memory alloy and optical cables was developed in this study. In order to verify the developed method, light loss measurement test was conducted according to indoor temperature changes, while also conducting fire simulation tests by installing test beds in common underground zones with different external environments of temperature and distance. Upon carrying out experiments, the fire monitoring system developed in this study was found to be able to detect fires in long distance sections in real time.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.24 no.7B
• /
• pp.1252-1260
• /
• 1999

The HFC network has a architecture of a star topology in fiber optic trunks, and tree and branch topology is used in the part of coaxial cable. It is well known that the HFC upstream channel is noisy. Ingress, common mode distortion and impulse noise exist in the upstream channel. In order to provide Quality of Service(QoS) to users with real-time data such as voice, video and interactive services, the evolving IEEE 802.14 standard for HFC networks must include an effective priority scheme. The scheme separates and resolves collisions between stations in a priority order. It is important to simulate protocols under a practical environment. The proposed algorithm in this paper is simulated with the assumption that the collision detector made certain mistake due to noises. Simulation results show that the proposed algorithm is more efficient than existing tree-based algorithm under practical environment.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.2
• /
• pp.666-671
• /
• 2016

This paper introduces a device providing close local lighting to the affected part, where the operation-purpose astral lamp alone cannot shed light directly, in an operation room of hospitals or clinics, which helps clinical doctors perform safe treatment of the affected part deep inside a human body. This medical assisting lighting is a device necessary to prevent fatal operation failures, which can occur with minute operation processes, such as tumor removal or angiorrhaphy. The components, such as the light source and power supply were designed to be low power consuming and small in size, have a narrow angle lens was used to increase the light spreading effect and focused illumination. The end-caps of the light transmission device using an optical cable and the lighting device were designed in the waterproof type to enable disinfection of these devices after use for the next patients. According to the measurement of the light source properties made after development of the retractor lighting device, the illumination intensity was 490 lux, the brightness was $11,550cd/m^2$, general color rendering index was 78, color temperature was 11,000K, and the intensity distribution was even, which were confirmed to be adequate for medical assisting local lighting.

• Journal of Biomedical Engineering Research
• /
• v.27 no.4
• /
• pp.154-163
• /
• 2006

A 64-channel magnetocardiogram (MCG) system using low-noise superconducting quantum interference device (SQUID) planar gradiometers was developed for the measurements of cardiac magnetic fields generated by the heart electric activity. Owing to high flux-to-voltage transfers of double relaxation oscillation SQUID (DROS) sensors, the flux-locked loop electronics for SQUID operation could be made simpler than that of conventional DC SQUIDs, and the SQUID control was done automatically through a fiber-optic cable. The pickup coils are first-order planar gradiometers with a baseline of 4 em. The insert has 64 planar gradiometers as the sensing channels and were arranged to measure MCG field components tangential to the chest surface. When the 64-channel insert was in operation everyday, the average boil-off rate of the dewar was 3.6 Lid. The noise spectrum of the SQUID planar gradiometer system was about 5 fT$_{rms}$/$\checkmark$Hz at 100 Hz, operated inside a moderately shielded room. The MCG measurements were done at a sampling rate of 500 Hz or 1 kHz, and realtime display of MCG traces and heart rate were displayed. After the acquisition, magnetic field mapping and current mapping could be done. From the magnetic and current information, parameters for the diagnosis of myocardial ischemia were evaluated to be compared with other diagnostic methods.

• Journal of Korea Port Economic Association
• /
• v.31 no.2
• /
• pp.41-53
• /
• 2015

In Paracomon Inc. v. Telus Communication, Realice's anchor became entangled with a working fiber-optic submarine cable during its voyage and are presentative of the shipowner(the captain) cut the cable. The owner of the cable brought a claim for the repair cost against the shipowner. The shipowner then advanced a third party claim against a liability insurance underwriter. The Supreme Court of Canada (SCC) held that the shipowner was entitled to limit its liability under the 1976 Convention on the Limitation of Liability for Maritime Claims. The SCC also ruled that even though the misdeed of the shipowner was insufficient to break its right to limitation of liability, its wrongdoing constituted willful misconduct under the 1993 Canada Marine Insurance Act, allowing the underwriter to deny coverage for the incident. Thecasewasthefirsttoaddresstheinterrelationship between the shipowner's right to limit liability under the international convention regime and the availability of liability insurance with respect to such limited liability. This study analyzes the reasoning behind the SCC's judgment and evaluates the appropriateness of this court's decision based on the current maritime industry as well as prevailing maritime law. It concludes that the SCC's decision to declare that the shipowner retained the right to limit its liability is appropriate under the Limitation Convention (1976). However, its declaration that the liability insurer was discharged from liability is not correct in due consideration of the common recognition in the maritime industry, the intended purpose of a third party's right against the liability insurer, and the adoption process of the conduct barring limitation. Based on the SCC's decision, this study finally reviews the issue of the shipowner's right to limit and the coverage of the liability insurer in the Sewol case (2014).