• Journal of the Korea Safety Management & Science
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• v.18 no.2
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• pp.29-36
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• 2016

This study of small & Medium-Sized construction sites construction disaster prevention technology conduction-site visits from the map results report by the inspector on-site advice and technical guidance for the analysis of deficiencies and potential construction of disaster revealed the potential factors causing an accident as follows. As a results, Should not be a once a month visits. Therefore should be changed at least twice a month to help prevent accidents of this system is to be judged.

• Proceedings of the KIEE Conference
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• 2005.07e
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• pp.106-108
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• 2005

본 연구에서는 산업용 패널(PANEL) 작업관리를 위한 보안 시스템의 한 예를 제안한다. 관리자 및 작업자, 작업 시작시간, 종료시간 및 모든 작업패널을 개별적으로 개폐 관리할 수 있으며 인증번호에 의하여 작업승인 제어가 가능하고 이상시 경보를 발령하도록 하며 HMI에 의해 감시기능을 갖추었다. 산업용 이더넷을 이용하여 PC 기반 패널보안시스템을 제작하여 제안한 시스템의 유용성을 제시하였다.

• Journal of the Korea Safety Management & Science
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• v.19 no.2
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• pp.15-29
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• 2017

In changes of social environment, change of the use of land due to the change of residence type, industry and urban structure is an influential factor to safety vulnerable social group. From PTSD from disaster experience point of view, experience of disaster, damage from disaster, witness of disaster make people experience anxiety and confusion, increase the anxiety toward disaster and lead to difficulty in daily lives. As for the result of analyzing anxiety factors regarding disaster damage potential composed of 20 items of safety manager, damage potential of sink hole which recently rapidly increased was the highest, and followed by anxiety from safety damage potential of family, anxiety from phone call damage. Likewise, if the anxiety toward disaster damage potential is digitized, it contributes to setting safety management planning for disaster prevention as it visualizes the risk.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.517-519
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• 2005

정부는 최근 IT839전략에서 RFID/USN(Ubiquitous Sensor Network)를 기반으로 한 정보화 추진 개념을 정립하였으며, 기술개발 및 시범사업 등을 통하여 이를 확산시키기 위한 기본계획을 발표함과 동시에 RFID/USN 시스템 도입이 적극적으로 추진되고 있다. 본 논문에는 RFID를 기반으로 한 세가지 USN서비스를 도출하고 구현한다. RFID 개념을 계승, 확장한 USN 서비스로 관리물품 도난방지 서비스, 무단 침입 경보 서비스, 사용자 인식 공간 서비스를 도출한다. 또한 본 논문에서는 스마트 단말기에 대한 소개를 하고 위 서비스들의 구현상의 설계 쟁점들을 고려한 서비스 시스템을 구현한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.4
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• pp.69-74
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• 2009

Abandoned objects should be treated as possibly dangerous things for public areas until they turn out to be safe because explosive material or chemical substance is intentionally contained in them for public terrors. For large public areas such as airports or train stations, there are limits in man-power for security staffs to check all the monitors for covering the entire area under surveillance. This is the basic motivation of developing the automatic detection system for dangerous abandoned objects based on vision technology. In this research, well-known DBE is applied to stably extract background images and the HOG algorithm is adapted to discriminate between human and stuff for object classification. To show the effectiveness of the proposed system, experiments are carried out in detecting intrusion for a forbidden area and alarming for abandoned objects in a room under surveillance.

• Journal of Gastric Cancer
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• v.5 no.4 s.20
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• pp.295-303
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• 2005

The Korean laparoscopic Gastrointestinal Surgery Study Group made a survey of laparoscopic gastric surgeries which were performed in Korea during 2004. Thirty-eight surgeons from 36 Institutions responded to the questionnaires. One thousand eighty-nine laparoscopic gastric operations were performed during 2004. The cumulative number from 1995 to 2004 was about 2,386. Seven hundred fifty-four operations for a gastric adenocarcinoma were performed during 2004 which is almost two times the number performed during 2003. Laparoscopic radical procedures, such as a laparoscopy-assisted distal gastrectomy or total gastrectomy (LADG and LATG) have increased rapidly since 2001 (55 cases in 2001, 150 cases in 2002, 364 cases in 2003 and 738 cases in 2004). Especially, laparoscopic total gastrectomies were explosively adopted last year (20 cases in 2003 and 112 cases in 2004). However, laparoscopic function-preserving gastrectomies, which included one laparoscopy-assisted pylorus-preserving gastrectomy and laparoscopy-assisted proximal gastrectomy, are rarely performed at this time. One hundred forty-two wedge resections for a gastric submucosal tumor were performed during 2004. Hand-assisted laparoscopic surgery (HALS) was performed in 39 cases in 2001, 55 in 2002, and 49 in 2003; however, only 5 such surgeries were performed during 2004. In 2003, laparoscopic bariatric surgery began, and during 2004, 49 operations were performed. In terms of indications of laparoscopic gastric surgery for adenocarcinoma, 19 surgeons performed a LADG only for a T1 lesion, and 7 surgeons extended their indications to T2N0 lesions. In the near future, laparoscopic procedures for gastric cancer will be widely adopted in Korea if the medical-insurance obstacle is overcome, and the long-term survival results are verified.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.8
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• pp.42-46
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• 2010

Energy detection based spectrum sensing compares the energy of a received signal from a primary user with a detection threshold and decides whether it is active or not in the frequency band of interest. Here the detection threshold depends on not only a target false alarm probability but also the level of the noise energy in the band. So, if the noise energy changes, the detection threshold must be adjusted accordingly to maintain the given false alarm probability. Most previous works on energy detection for spectrum sensing are based on the assumption that noise energy is known a priori. In this paper, we present a new energy detection scheme updating its detection threshold under the assumption that the noise is white, and analyze its detection performance. Analytic results show that the proposed scheme can maintain a target false alarm rate without regard to the noise energy level and its spectrum sensing performance gets better as the time bandwidth product of the signal used to estimate the noise energy increases.

• Journal of Navigation and Port Research
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• v.31 no.8
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• pp.645-652
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• 2007

As a method to improve the present operational and safe function in navigation this paper developed an efficient and economical integrated system of ship's information. This system is, systematically and comprehensively, to monitor, save, analyse, and display information on navigation and environment around own ship in real time by connecting one user to another through an on-board LAN or data communication via satellite so that many users on board can obtain simultaneously and easily the information in real time not only in the wheelhouse and engine room but also in many robins and ship's offices. And it consists of four(5) components; data distribution program, database of navigational and engine-related information, multi-functional monitoring program, ship management program and other application program.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.8
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• pp.1713-1720
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• 2009

An local area weather condition monitoring system to minimize many disasters from the sudden change of weather condition in local and mountain ales is proposed. Firstly, the comparison of present state of the related monitoring systems and the possibility of realization with some merits are investigated. Moreover, this paper present direction of local area weather condition monitoring system based on integration of wireless sensor network and CDMA network following some case study. The sensor node for wireless sensor network and an interface dongle are fabricated for the system. The stand-alone software in cellular phone is also developed. Through the efficient integration of both networks, the measured weather condition data from sensors can be transmitted to the server or mobile to monitor with high reliability. The proposed monitoring system will guide new type of project in wireless sensor network and support alarm service of the sudden change of weather condition to mobile user from central official regulations.

• Journal of the Korean Geotechnical Society
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• v.36 no.10
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• pp.41-56
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• 2020

For the rapid and accurate warning, the system requires not only the sufficient number of seismometers but also the appropriate detection technique of sensor data. Instead of installing new seismometers, on-board accelerometers of the train could be utilized as alternatives. However, the data from on-board accelerometers includes train vibrations and the response of embankment site by earthquake, which are different from earthquakes measured from the seismometer. This study suggests signal analysis technique to detect earthquake from the on-board accelerometer data. The virtual on-board accelerometer data including the response of embankment site, obtained from site response analysis method, has been constructed. The constructed data has been analyzed using short time Fourier transform (STFT) and wavelet transform (WT). STFT method provides better performance to detect long-period earthquake whereas WT method is more available to detect short-period earthquake.