• Bulletin of the Society of Naval Architects of Korea
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• v.24 no.3
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• pp.17-24
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• 1987

The present paper describes the results of the cooperative experimental study organized by the Resistance Committee of the Korea Towing Tank Conference, which aims to improve model testing technique and accuracy and to self-evaluate their own capabilities. A Series 60, $C_b=0.60$ model was tested at the towing tanks of Korea Institute of Machinery & Metals, Hyundai Maritime Research Institute, Seoul National University, and Inha University. Results for total resistance, wave pattern analysis, wave pattern analysis, wave profile, trim & sinkage and wake measure ments are presented.

• Journal of the Korean Society for Precision Engineering
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• v.33 no.9
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• pp.761-768
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• 2016

Weight bearing is effective during rehabilitation of gait, in the elderly and disabled people. Various training devices using weight bearing function were developed along with treadmill walking; however, no device has been developed in conjunction to walking on the ground. Here, we designed a rail type frame of a gait rehabilitation system for body-weight support (BWS) function, and analyzed its mechanical safety in the static weight bearing condition of a vertical axis. Computational simulations were performed to analyze structure of the driving parts, which are connected with a rail and driving rollers and the lower plate of the BWS. Structural analyses showed the drivers and BWS were safe, when simulated at 135kg weight under static conditions. Thus, this rail type rehabilitation system can be used for gait training of the elderly and disabled.

• The Journal of Korean Obstetrics and Gynecology
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• v.32 no.4
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• pp.39-54
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• 2019

Objectives: The purpose of this study is to analyze both treatment and adverse events of Korean medicine treatment for whiplash associated disorder patients during pregnancy. Methods: We investigated the medical records of 44 pregnant patients who had got into car accidents from April 1, 2018 to May 31, 2019. Results: 100 percent of the inpatients and 88 precent of the outpatients were treated by acupuncture. 79 percent of the inpatients and 72 precent of the outpatients were treated by chuna, and 86 percent of the inpatients and 64 precent of the outpatients were treated by pharmacopuncture. Out of 32 patients with low back pain, 94 percent were treated by acupuncture, 47 percent by phramacopuncture and 38 precent by chuna. 90 percent of 31 patients with cervical pain were treated by acupuncture, 71 percent were treated by pharmacopuncture and 77 percent were treated by chuna. There were adverse events like cough, rhinorrhea, dilatation of cervix and worsen low back pain during or after the treatment. Conclusions: Korean medicine treatment including chuna and pharmacopuncture can be applied to pregnant women injured by traffic accident.

• ETRI Journal
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• v.37 no.2
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• pp.348-358
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• 2015

Mobile devices have been widespread and become very popular with connectivity to the Internet, and a lot of desktop PC applications are now aggressively ported to them. Unfortunately, mobile devices are often vulnerable to malicious attacks due to their common usage and connectivity to the Internet. Therefore, the demands on the development of mobile security systems increase in accordance with advances in mobile computing. However, it is very hard to run a security program on a mobile device all of the time due the device's limited computational power and battery life. To overcome these problems, we propose a novel mobile security scheme that migrates heavy computations on mobile devices to cloud servers. An efficient data transmission scheme for reducing data traffic between devices and servers over networks is introduced. We have evaluated the proposed scheme with a mobile device in a cloud environment, whereby it achieved a maximum speedup of 13.4 compared to a traditional algorithm.

• Journal of Korea Society of Digital Industry and Information Management
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• v.6 no.3
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• pp.69-77
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• 2010

Authentication and key establishment are fundamental procedures to establish secure communications over public insecure network. A password-based scheme is common method to provide authentication. In 2008, Khan proposed an efficient password-based authentication scheme using smart cards to solve the problems inherent in Wu-Chieu's authentication scheme. As for security, Khan claimed that his scheme is secure and provides mutual authentication between legal users and a remote server. In this paper, we demonstrate Khan's scheme to be vulnerable to various attacks, i. e., password guessing attack, insider attack, reflection attack and forgery attack. Our study shows that Khan's scheme does not provide mutual authentication and is insecure for practical applications. This paper proposes an improved scheme to overcome these problems and to preserve user anonymity that is an issue in e-commerce applications.

• Korean Journal of Head & Neck Oncology
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• v.30 no.2
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• pp.115-118
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• 2014

Papillary thyroid carcinoma is known as its relatively high cure rate after surgical treatment. But invasion of the trachea by thyroid carcinoma is poor prognostic factor and the best management is en bloc surgical resection of the tumor invading the trachea. A 55-year-old man was diagnosed as papillary thyroid cancer with tracheal invasion. We treated the patient by total thyroidectomy with window resection of invading trachea followed by immediate reconstruction with sternohyoid muscle flap and tracheostomy. At 48 days after surgery, tracheostoma was closed and the patient had no functional complication by the surgical process. Until 10 months after surgery, there was no sign of recurrence and the patient led social life without any discomfort. We present this case with a review of the related literatures.

• Applied Chemistry for Engineering
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• v.25 no.4
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• pp.357-362
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• 2014

To prepare diketopyrrolopyrrole (DPP) red 254 pigment with high shield and bright color, DPP red 254 crude previously synthesized was treated at various thermal-treat temperature, addition derivative and ball-milling. The properties of samples were measured by the means of FT-IR, UV-Vis spectroscopy, TEM, PSA, BET surface area analyzer, viscometer and spectrophotometer. It was found that solvent thermal-treatment of the sample prepared after ball-milling as nano-scale was very effective method in pigmentation process.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.11a
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• pp.211-214
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• 2008

Many types of new Korean Firearms were developed during the reign of King Se Jong(1418$\sim$1450). After the Chong-Tong-Deung-Rok(1448), The Ju-hwa was renamed as the Sin-Gi-Jeon. There was four kinds of rocket propelled arrows : So(small), Chung(medium), Dae(large) and San-hwa(multiple bomblets)-Sin-Gi-Jeon. Dae-Sin-Gi-Jeon known to be the best and biggest of any rocket propelled arrows in the 15th century. This paper describes Yak-Tong(propellant case made by paper) of Dae-Sin-Gi-Jeon.

• Korean Journal of Veterinary Research
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• v.53 no.4
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• pp.211-216
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• 2013

This study was focusing on evaluating the protection of polyphosphate kinase (ppk) deleted and/or temperature-sensitive (ts) Salmonella Enteritidis (SE) as an attenuated vaccine in chickens. We constructed SEppk, SEts and SEppk::ts mutants and screened those mutants by growth capability in vitro, protection study in mice model and antibody response in chickens. Among the mutants, SEppk::ts-3 was selected because it showed higher growth capability, good protection against highly virulent SE in mice model, and good antibody response in chickens. SEppk::ts-3 also showed good protection against highly virulent SE isolate because it decreased colonization of virulent SE challenge strain in spleen, liver and cecum compared with the non-vaccinated control. The SEppk::ts-3 mutant showed cross-protection against S. Gallinarum (SG) challenge although the its cross-protection rate was a little lower than that of SG9R, a commercial vaccine against SG infection. To use for live attenuated vaccine in chickens, it should further be characterized.

• Journal of Astronomy and Space Sciences
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• v.28 no.3
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• pp.225-232
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• 2011

We have designed and manufactured the Earth observation camera (EOC) of multi-purpose infrared imaging system (MIRIS). MIRIS is a main payload of the STSAT-3, which will be launched in late 2012. The main objective of the EOC is to test the operation of Korean IR technology in space, so we have designed the optical and mechanical system of the EOC to fit the IR detector system. We have assembled the flight model (FM) of EOC and performed environment tests successfully. The EOC is now ready to be integrated into the satellite system waiting for operation in space, as planned.