• Proceedings of the KAIS Fall Conference
• /
• 2008.11a
• /
• pp.160-163
• /
• 2008

This study developed selecting equipment for damage of street lamp circuit used by current transform and diode. To develop this system, current check used current transform and indication system used LED device. As faulted, current of street lamp circuit change with fault decivce. This chage of current detected and indicated by selecting equipment

• Journal of Korean Foot and Ankle Society
• /
• v.12 no.1
• /
• pp.36-40
• /
• 2008

Purpose: The purpose of this study is to find out the normal results in ankle on varus stress, valgus stress, and anterior draw stress in young men in korea. This would be helpful as the basic data of measuring of ankle instability for operational indication. Materials and Methods: Varus and Valgus stress anteroposterior radiographs and Anterior drawing stress lateral radiographs of 600 normal ankles were reviewed. First, A line parallel was drawn parallel to the articular surface of the distal tibia, and another line was drawn parallel to the articular surface of the talus on anteroposterior radiographs. The interior angle that subtended by these two lines was measured. Second, the reference point is located at the posterior border of the tibia, and the shortest distance from this point to the proximal posterior articular surface of the talus is measured. Results: There were 300 males and 600 ankles. The mean age overall was 21 years (19-22 years) old. The mean length of ankle on anterior draw stress was $5.54{\pm}3.33\;mm$. The mean a interior angle of ankle on varus stress was $0^{\circ}-8.93^{\circ}$, and on valgus stress $0^{\circ}-7.78^{\circ}$. Conclusion: We can consider for operational indication at over the 8.87 mm on anterior draw stress, over the $8.93^{\circ}$ on varus stress, and over the $7.78^{\circ}$ on valgus.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.22 no.1
• /
• pp.162-172
• /
• 1997

In this paper, we investigated the performance of a binary feedback switch algorithm for the ABR(Available Bit Rate) service in ATM networks. A binary feedback switch is also called EFCI(Explicit Forward Congestion Indication) switch and can be classificed into input cell processing(IP) scheme according to processing methods for the EFCI bit in data-cell header. We proposed two implementation methods for the binary feedback switch according to EFCI-bit processing schemes, and analyzed the ACR(Allowed Cell Rate) of source and the queue length of switch for each scheme in steady state. In addition, we derived the upper and lower bounds for maximum and minimum queue lengths, respectively, and investigated the impact of ABR parameters on the queue length.

• Proceedings of the KSR Conference
• /
• 2008.06a
• /
• pp.1536-1542
• /
• 2008

As information technology has been rapidly developed, it is expected that the needs of ubiquitous for information on construction, maintenance and operational processes in railway field will arise. U-Rail system, for which information ubiquitous in railway field, can be defined as the human centered future railway system that enables to perform real-time state indication and auto information generation and its transmission by interchanging information organically among railway suppliers, users, and operator. In this paper, we analyzed main components of U-Rail system and its service items from the view of information technology and communication network technology, with focusing on railway field.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2014.11a
• /
• pp.1130-1133
• /
• 2014

본 논문은 ESL(Electronic Shelf Labels, 전자가격표시기)과 LBS(Location Based Service, 위치 기반 서비스)를 융합하여 개발된 시스템으로 매장 고객에게 어플리케이션을 통해 대형마트에서 이벤트 정보를 제공 혹은 물건 위치를 쉽게 찾아 갈 수 있도록 하고, 관리자는 서버에서 물품의 정보를 관리하거나 각종 서비스를 제공하는 것을 편리하게 만들기 위해 진행되었다. ESL 태그를 아두이노와 LCD를 연결하여 구현하고 지그비(Zigbee)를 이용하여 서버와 통신한다. LBS를 구현하기위하여 ESL TAG에 BLE(Bluetooth Low Energy, 저전력블루루스)를 장착하고, 스마트폰은 ESL TAG에서 나오는 BLE 신호의 RSSI(Received Signal Strength Indication)값을 이용해 어플리케이션에서 사용자의 위치를 측정할 수 있게 한다.

• Proceedings of the KSR Conference
• /
• 2008.11b
• /
• pp.1188-1194
• /
• 2008

Derail accident of train and motorcar through signal override causes such a huge obstruction in train service. To minimize such derail accidents, number of bills were examined such as installing normal and reverse position indicator on the switch. A indicator was necessary which does not affect current equipments and not to be confused as traffic lights. Normal and reverse position indicator is installed in the middle of the rail in front of front rod of switch. It is to prevent derail accident while manual handling of obstacle by ease of verifying normal and reverse position by attendants or motorcar driver. Also, it is a device that prevents accidents by indicating normal and reverse position of switch during night service of motorcar. Such a prevention accomplished through thorough maintenancework of equipment, precise handling of operators and exterior factors are eliminated or perceived and treated well.

• Proceedings of the KSME Conference
• /
• 2001.11b
• /
• pp.859-866
• /
• 2001

During the Pre-service Inspection for Wolsong Unit 3&4 in 1997/1998 respectively, 17 Distorted Roll Transition indications(over expanded beyond tubesheet secondary face) were identified at the Unit 4 (S/G B, D). Six(6) tubes out of these tubes were plugged in 1998. However the first Periodic Inspection identified additional 110 indications in 1999 and 2000. The additionally identified 110 indication call, not reported at the Pre-service Inspection, are; 2 Not-Finally-Expanded-Tubes and 108 Distorted Roll Transition tubes. Design limit of each Steam Generator tube Plugging is 6.4%. Plugging was performed by the Steam Generator manufacturer under the warranty. When Distorted Roll Transition indications were first identified on the Unit 4 in 1998 the degree of Over-expansion was measured using an inner dial-gage to make the disposition of Nonconformance report. 2 Not-Finally-Expanded-Tubes were plugged and 10 tubes out of 108 Distorted Roll Transition Tubes were also plugged as a preventive measure.

• Journal of the Korean earth science society
• /
• v.30 no.3
• /
• pp.330-343
• /
• 2009

Pedagogical content knowledge (PCK) has been regarded as an indication of science teachers' professionalism. The purpose of this study was to analyze topic-specific PCK of pre-service and in-service science teachers, comparatively. For this purpose, we developed an analytic framework for explicitly documenting science teacher' PCK and applied the framework for analyzing the difference within the same topic and with two different topics. Findings are as follows: (1) With the same topic, there was considerable difference between pre-service and in-service teachers in the components of PCK, not to mention individual difference. (2) In case of two different topics, we did not recognize a tendency of change in PCK, but remarkable differences in PCK were identified between two different topics. This study affirmed the topic specificity of PCK, and discussed a possibility of employing PCK analytic framework and its profile as one of the tools that could be used to develop and assess teachers' professionalism.

• Mycobiology
• /
• v.47 no.4
• /
• pp.506-511
• /
• 2019

We investigated the antifungal activities of an endophytic fungus identified as Acaromyces ingoldii, found on a loblolly (Pinus taeda L.) pine bolt in Louisiana during routine laboratory microbial isolations. The specific objectives were to determine the inhibitory properties of A. ingoldii secondary metabolites (crude extract) on the mycelial growth of a brown-rot fungus Gloeophyllum trabeum and a white-rot fungus Trametes versicolor, and to determine the effective concentration of A. ingoldii crude preparation against the two decay fungi in vitro. Results show the crude preparation of A. ingoldii from liquid culture possesses significant mycelial growth inhibitory properties that are concentration dependent against the brownrot and white-rot fungi evaluated. An increase in the concentration of A. ingoldii secondary metabolites significantly decreased the mycelial growth of both wood decay fungi. G. trabeum was more sensitive to the inhibitory effect of the secondary metabolites than T. versicolor. Identification of specific A. ingoldii secondary metabolites, and analysis of their efficacy/specificity warrants further study. Findings from this work may provide the first indication of useful roles for Acaromyces species in a forest environment, and perhaps a future potential in the development of biocontrol-based wood preservation systems.

• Transactions of the Korean Society of Pressure Vessels and Piping
• /
• v.11 no.2
• /
• pp.20-24
• /
• 2015

During refueling Outage, In-service inspections(ISIs) for the Nuclear Power Plant components are mandatory requirement in accordance with ASME Code Sec. XI. Especially, in current ultrasonic testing is one of the most important NDT techniques that are used for volumetric examination methods for nuclear power plant components, and accurate sizing of flaw indication by UT is essential to assure the integrity of the components. However, ASME code specifies minimum requirement for vessel examination procedure, and so far many different flaw sizing approaches have been tried to apply. Through the Round Robin Test(RRT), the accuracy of ultrasonic flaw sizing using DAC techniques was measured with the mock-ups simulating typical pressure vessel welds. These mock-ups contain artificially introduced flaws of known size and location. This paper shows experimental comparison data on the accuracy of techniques using such as 6dB drop, 50%DAC, 20%DAC and 20%DAC with beam spread correction, and also shows that diverse DAC techniques can be effectively applied to the assessment of the flaw sizing for pressure vessel welds in the stage of welding and fabrication.