• Magazine of the Korean Society of Agricultural Engineers
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• v.16 no.1
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• pp.3293-3301
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• 1974

An experimental work was conducted by using a laboratory-made model dryer to investigate the effect of the rate of natural forced-air on the drying rate of rough rice which was deposited in the deep-bed. The dryer consisted of 8 cylinderical containers with grain holding screen at their bottoms, each of which having 30cm in diameter and 15cm in height. The containers were sacked vertically with keeping them air-tight by using paper tape during dryer operation. Two separate layers of containers were operated in the same time to have two replications. The moisture contents of grains within each bins after predetermined period of dryer operation were determined indirectly by measuring the weight of the individual containers. The air-rates were maintained at 6 levels, or 5, 8, 10, 15, 18 and 20 millimenters of static head of water. The roomair conditions during dryer operation were maintained in the range of 10-l5$^{\circ}C$ in temperature and 40-60% in relative humidity. The results of the study are summarized as follows: 1. Drying characteristics of the grains in the bottom layers were approximately the same regardless of airdelivery rates, giving the average drying rate as about 0.35 percent per hour after 40-hour drying period, during which moisture content (w. b.) reduced from 24 percent to about 10 percent. 2. After about 40-hour drying period, the mean drying rates increased from 0.163 percent per hour to 0.263 percent per hour as air-flow rates increased from 5mm to 87.16mm of static head of water. In the same time, the moisture differences of grains between lower and upper layers varied from 12.7 percent at the air rate of 5mm of water head to 7.5 percent at the air-flow rate of 20mn of water head. Thus, the greater the air-flow rate was, the more overall improvement in drying performance was. Additionally, from the result of ineffectiveness of drying grain positioned at 70cm depth or above by the air rate of 5mm of static head of water it may be suggested in practical application that the height of grain deposit would be maintained adequately within the limits of air-rates that may be actually delivered. 3. Drying after layer-turning operation was continued for about 30 hours to test the effectiveness of reducing moisture differences in the thick layers. As a result of this layer-turning operation, moisture distribution through layers approached to narrow ranges, giving the moisture range as about 7 percent at air-flow rate of 5mm head of water, about 3 percent at 10mm head about 2 percent at 15mm head, and less than 1 percent at 20mm head. In addition, from the desirable results that drying rate was rapid in the lower layers and dully in the upper layers, layer-turning operation may be very effective in natural air drying with deep-layer grain deposit, especially when the forced air was kept in low rate. 4. Even though the high rate of air delivery is very desirable for deep-layer natural-air drying of rough rice, it can be happened that the required air delivery rate could not be attained because of limitation of power source available on farms. To give a guide line for the practical application, the power required to perform the drying with the specified air rate was analyzed for different sizes of drying bin and is given in Table (5). If a farmer selects a motor of which size is 1 or {{{{1 { 1} over {2 } }}}} H.P. and air-delivery rate which ranges from 8~10mm of head, the diameter of grain bin may be suggested to choose about 2.4m, also power tiller or other moderate size of prime motor may be recommended when the diameter of grain bin is about 5.0m or more for about 120cm grain deposit.

• Journal of Digital Convergence
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• v.12 no.8
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• pp.229-234
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• 2014

Vehicular electronic communication system has continued to develop in favor of high performance and user convenience with the evolution of auto industry. Yet, due to the nature of communication system, concerns over intruder attacks in transmission sections have been raised with a need for safe and secure communication being valued. Any successful intruder attacks on vehicular operation and control systems as well as on visual equipment could result in serious safety and privacy problems. Thus, research has focused on hardware-based security and secure communication protocols. This paper proposed a safe and secure vehicular communication protocol, used the formal verification tool, Casper/FDR to test the security of the proposed protocol against different types of intruder attacks, and verified that the proposed protocol was secure and ended without problems.

• Journal of the Korean Society of Marine Environment & Safety
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• v.19 no.4
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• pp.382-390
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• 2013

The efforts for improving 'Maritime Traffic Safety Assessment Scheme(MTSA scheme)' have continued to the present. At this point, it needs to establish sound MTSA scheme to proceed acceleration step through the comprehensive review and systematic approach. In this study, it aimed to design of Metaevaluation Model for the comprehensive analysis of MTSA scheme with applying theory of the Metaevaluation, that is the evaluation of evaluation. To put it concretely, This research draw a basic model by using Metaevaluation methods like as literature studies, expert reviews, surveys and etc. and proposed a available 'PIP'OU' Metaevaluation Model through verified validity and reliability. This PIP'OU Model is the first proposed Metaevaluation Model in maritime field and it is expected to be used as framework to draw up improvement measure with deriving problem for the MTSA scheme.

• Electronics and Telecommunications Trends
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• v.35 no.6
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• pp.24-36
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• 2020

To solve social problems such as traffic accidents caused by human driver factors and to guarantee the convenience of movement, research on the commercialization of automated vehicles is being actively conducted worldwide. In automated driving levels 2 and 3, the driver must be ready to drive at any time as the automated driving system sometimes requires manual driving by the driver. The purpose of this research is to analyze the trends in global automated vehicle guidelines and prepare guidelines for the characteristics of human factors necessary for the control rights transition system of automated vehicles. To this end, we reviewed at the guidelines for automated vehicles in the US, Germany, and Japan; ISO international standards; domestic automated vehicle standards; and the EU AdaptiVe project. In addition, a guideline is presented that can be referenced and applied by organizations related to automated vehicle manufacturing and operation. It was developed by utilizing the results of our studies on the human factors affecting the guideline of control rights transition. As national laws and regulations and continuous technology development for commercialization of automated vehicles are in progress, further research into and the revision of guidelines for safe automated vehicle production and use should be continued.

• Journal of Korean Foot and Ankle Society
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• v.8 no.1
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• pp.52-57
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• 2004

Purpose: We evaluated the effect of nerve decompression for restoration of plantar sweating and sensation in diabetic neuropathic feet, and we selected diabetic neuropathic patients with the possibility of overlying entrapmental neuropathy. Materials and Methods: From June 2002 to May 2003, we have investigated and follow-up examed 10 patients with diabetic neuropathic feet, with decreased sensation in their lower limb, who underwent peripheral nerve decompression. The surgical procedure was multiple neurolysis of the common peroneal nerve, posterior tibial nerve and its three branches of one limb. We compared the operated limb with the opposite, unoperated limb. We performed history taking, physical examination, sweat secretion test, touch sensory test using Semmes-Weinstein monofilaments and electrodiagnostic study, pre-operatively and post-operatively. Results: On 6 months after the operation, the post-operative tests showed that there were noticeable improvements to sensation, statistically (P<0.05), but there was no change in the sweat secretion test. According to the Cseuz criteria, 7 patients out of the 10 patients who received the multiple neurolysis showed excellent or good results. Conclusion: We observed that the peripheral nerve neurolysis could be benefit for improving sensation and alleviating pain of the diabetic neuropathic feet with nerve entrapmental symptoms, but there was no change in the sweat secretion on short-term follow-up. To identify whether the effect will be continued or not, additional follow-up will be required.

• Aerospace Engineering and Technology
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• v.7 no.2
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• pp.67-75
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• 2008

The electrostatic charging/discharging mechanism and its effects, and the system design considerations in the space plasma environment are studied in this paper. The electrostatic discharge (ESD) effects are carefully taken into account for a design of the satellite system at the early stage of the development. Generally, the electrical design requirements are specified to protect the satellite system from the ESD effects in the electromagnetic compatibility specifications. Those requirements are included the grounding, the bonding, the shielding, the conductive coating, the electric interfacing and so on. The space charging is caused by the increasing of the voltage difference between the each locations on the satellite surface. If the space charging is continued up to threshold, it may be occurred the system failure. This phenomenon is depended on the mission of system, electrical and mechanical configuration, system operation, and orbit condition. Therefore the related requirements are properly tailored and concentrated into the safety design.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.5
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• pp.737-746
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• 2017

In 2017, amid changes in the security market such as integrated security (IS) and convergence security (CS), a variety of security paradigms in terms of operation and management have been suggested. Rather than changing existing network infrastructure and bringing about fluid, multi-dimensional changes, these solutions and technologies focus entire security capacity on a primary protection, leading to network infrastructure suffering from unexpected inherent violations and problems in a continued manner. Therefore, it is time to propose and develop a flexible network section that can protect from attacks of similar pattern and concentrated traffic attacks by applying a new concept of WB (Water-Bubble) to network infrastructure and analyzing on the basis of experiment and installation. Methodology of the WB-based highly secure flexible network section proposed in this study is expected to provide materials for studies on how to achieve network section security taking into account three major limitations and security standards: fluidity, unpredictability, and non-area scalability by contact point ratio, by changing a network area predicted to be the final target of attack into resonant network section (area) with flexible area changes.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.2
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• pp.247-274
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• 2018

In 2013, the Japanese bookstore company CCC entrusted the management and operation of the library as the designated administrator of Takeo City Library. The library has a commercial facility in the hall and uses its own classification system. It was reported the number of visiting users was increased as 3.7 times in the first year of the reopening and it has attracted the attention of the public. The purpose of this study is to investigate the background, current status and operational characteristics of the Takeo City Library by conducting the literature review, content analysis of newspaper articles and interview survey on the library. As a result of the research, newspaper articles positively assessed the fact that the library provided a 'multicultural space' to small city residents, increased visitors, and local economic effects, but pointed out that the operating deficit continued, and the problem occurred in the selection of collections.

• Journal of Korean society of Dental Hygiene
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• v.19 no.6
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• pp.891-905
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• 2019

Objectives: The objective of this study was to examine the current state of dementia-related education for dental hygiene degree programs in Korea, as well as to develop a dementia-related curriculum for dental hygiene programs suitable for the social characteristics of Korea. Methods: The study was conducted between April and November 2018. First, the current state of dementia-related education for dental hygiene programs in colleges throughout Korea and dementia-related education for other health care-related fields were investigated. Based on the initial findings, the basic content of the preliminary curriculum was constructed. Second, based on the opinion of the dementia-related curriculum development committee comprising 10 professors of dental hygiene, the operations of dementia-related courses and relevant details were constructed. Third, these operations and relevant details were assessed and revised based on focus-group interviews. Fourth, the dementia-related curriculum was developed based on the study findings and literature review. Results: The name of the course in the developed curriculum was set as "Elderly Dental Hygiene and Practicum." The course was established as a "major elective," and was offered as two units with two instructional sessions of two hours each. The learning goal for this course was acquiring the methods for understanding and managing the characteristics of the elderly. A consensus was reached regarding conducting the theoretical and practical lessons on some of the dementia-related content. The dementia-related curriculum comprised 10 "required contents" which is to be conducted over three weeks of theoretical lessons and two weeks of practical lessons. Conclusions: With the growing elderly population, the development and operation of the curriculum for geriatric oral health interventions are warranted in dental hygiene education. However, continued discussions and improvements are needed on the extent of educational content, considering various dementia-related symptoms and general geriatric systemic diseases.

• The Academic Congress of Korean Shoulder and Elbow Society
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• 2005.03a
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• pp.107-111
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• 2005

29 year-old male was suffered from deep shoulder pain and muscle weakness 2 years ago. Recently 2 month ago lancinating shoulder pain and night pain was progressed. physical examination and MRI and EMG finding showed suprascapular nerve compression syndrome due to ganglion cyst in the shoulder joint. Arthroscopic ganglion cyst excision was performed and his symptoms was improved. 2 years later shoulder pain was developed in abduction and external rotation position and mild discomfort was continued. In second operation, SLAP lesion was found and arthroscopic SLAP repair was performed. Our case presented SLAP lesion occurred arthroscopic ganglion excision in the shoulder joint 2 years later.