• Journal of the Korean Society of Safety
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• v.4 no.1
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• pp.83-90
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• 1989

Recently, due to the increase of 220V distribution lines and equipments preventive measures to cope with several kinds of electric accidents is revealed as an urgent problem. This study investigates the following matters; the cause and present condition of e1ectric shock accident, the influence of electric shock on human body, the safety limit of electric shock, the method of distribution voltage, the insulation of electrical load apparatus, the teachnics of electric shock prevention and foreign materials concerned with this subject etc. This paper present the fundamental cause of electric shock and syntbetic preventive counter measure of electric shock, too.

• Journal of the Korean housing association
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• v.18 no.5
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• pp.85-91
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• 2007

This is a case study for improving the sound environmental quality of cafeteria in university campus. The purpose of the study is to find out the present condition of physical level, type, and cause of indoor noise of cafeteria in university campus by comparison with a restaurant near campus. Research methods were field survey and questionnaire survey. Field survey was consisted of measurement on equivalent and instant noise level and observation on noise type. Respondents of questionnaire survey were 60 students using subject cafeteria or restaurant. Surveys were carried out in the 8th and in the 14th of December 2005. The results are as follows. 1) Indoor noise levels of the cafeteria were measured as $67.2{\sim}76.6$ (average 73.3) dB(A)Leq5min and $60.3{\sim}90.5$ (average 71.2) dB (A), exceeded the indoor noise recommended value of ASHRAE (American Society of Heating, Refrigerating and Air Conditioning Engineers). But noise levels of the restaurant were $61.6{\sim}70.4$ (average 66.9) dB(A)Leq5min and $59.8{\sim}70.6$ (average 64.9) dB(A). 2) The users's responses on major noise type in the cafeteria were 'noise by handling equipment and tableware', 'noise by moving chairs', and 'talcing noise', but 'taking noise' and 'background music' in the restaurant. 3) It was found that indoor noise level of the cafeteria was caused by sound reflection of finishing materials, noise diffusion by open type kitchen, and dragging noise of movable furniture.

• Journal of the Korean Home Economics Association
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• v.43 no.9 s.211
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• pp.129-141
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• 2005

In this study, the major tendencies of divorce as represented in articles of Korea's major daily newspapers from the 1940's to the 1990's were explored. The method used for this study was content analysis, and 1,741 articles related to divorce were selected for analysis from the Chosun and Donga. The main categories and subcategories were classified as attitude toward divorce(negative, accepting, neutral), present condition of divorce(statistics, survey, analysis), cause of divorce(marital conflict, conflict with family, health-related troubles, financial troubles, and others), and information offered about divorce(related-laws, prevention and adaptation, and others). The major findings of this study were as follows. 1) The most frequently found category was information offered about divorce, and the following categories were featured in the newspapers in the order of cause of divorce, present condition of divorce, and attitude toward divorce. 2) The major discussions of divorce as represented in articles of Korea's daily newspapers from the 1940's to 1990's have been reflecting the changes of related laws, policy and legislation in our society. 3) The content analysis of newspaper articles on divorce indicated that concepts of marriage, divorce and family in our society have been diversified.

• The Journal of the Korea Contents Association
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• v.9 no.1
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• pp.331-338
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• 2009

We live was operates the life which is the Internet and became infra is very important. In order minimizes like this disfunction from will be applied the new order must take a position in cyber space. The cyber infringement most the information society brings about is serious concern middle one. The biggest thing is anonymous characteristic with cause of cyber crime. Also well cannot know becomes the cause where commits a crime that about cyber crime. Cyber crime the guilty conscience is thin. And the criminal who commits a cyber crime sense of insecurity is few. This paper which sees cyber infringement accident dividing came in public section, and analyzed presented a present condition and a confrontation plan.

• Journal of the Korean housing association
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• v.4 no.2
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• pp.45-54
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• 1993

The purpose of this research Is to suggest the main cause related to the apartment residents satisfaction on the interior landscape, especially, the difference of the interest degrees in the interior landscape according to the existence of the constructed interior landscape space, the interior landscape place, and the present condition of the interior landscape, and find out there lationship among them. As a result, the necessary data far the desirable derection of the apartment interior landscape will be presented. Generally, it appeared that the residents had much interests in interior it interior landscape but a poor knowledge and little experience, and that the amount invested was insufficient. There was much discontentment among the residents with the whole interior landscape. The residents didn;s expert much effect of the constructed interior landscape because there was little difference in the general matters according to the existence of the constructed interior landscape, the interest degrees in the interior landscape, the interior landscape place, and the present condition of the interior landscape.

• Journal of Institute of Control, Robotics and Systems
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• v.14 no.6
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• pp.554-557
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• 2008

We analyze the stability property of a class of nonlinear time-delay systems with time-varying delays. We present a time-delay independent sufficient condition for the global asymptotic stability. In order to prove the sufficient condition, we exploit the inherent property of the considered systems instead of applying the Krasovskii or Razumikhin stability theory that may cause the mathematical difficulty of analysis. We prove the sufficient condition by constructing two sequences that represent the lower and upper bound variations of system state in time, and showing the two sequences converge to an identical point, which is the equilibrium point of the system. The simulation results illustrate the validity of the sufficient condition for the global asymptotic stability.

• Journal of Korean Neurosurgical Society
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• v.50 no.1
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• pp.51-53
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• 2011

We present a rare case of medulloblastoma which presented with unilateral sudden sensorineural hearing loss as an initial symptom. A 19-year-old man was admitted to our hospital with a chief complaint of dizziness and facial numbness on the right side. His illness had begun two years previously with sudden hearing loss on the right side, for which he had been treated as an idiopathic sudden hearing loss. Magnetic resonance imaging demonstrated abnormal signals located mainly in the right middle cerebellar peduncle. We performed partial resection of the tumor by suboccipital craniotomy. The histopathological diagnosis was medulloblastoma. Intrinsic brain tumor is an extremely rare cause of sudden sensorineural hearing loss and is therefore easily overlooked as was in the present case. The present case highlights not only the need to evaluate patients with sudden sensorineural hearing loss by magnetic resonance imaging but also the importance of paying attention to intrinsic lesions involving the brainstem. Although this condition like the presented case might be rare, intrinsic brain tumor should be considered as a potential cause of sudden sensorineural hearing loss, as it may be easily missed leading to a delay in appropriate treatment.

• Smart Structures and Systems
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• v.29 no.2
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• pp.279-286
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• 2022

In this article, a novel propagation formulation of Rayleigh waves in a compressible isotropic half-space with impedance boundary condition is proposed by embedding the normal stress. In a two-dimensional case, it is assumed that a design boundary is free of normal traction and a shear traction depends on linearly a normal component of displacements multiplied by frequencies. Therefore, impedance boundary conditions affect the normal stress, where the impedance parameters correspond to dimensions of stresses over velocity. On the other hand, vanished impedance values are traction-free boundary conditions. The main purpose of this article is to present theoretically the existence and uniqueness of a Rayleigh wave formulation relying on secular equation's mathematical analyses. Its velocity varies along with the impedance parameters. Moreover, numerical experiments with different values for the velocity of Rayleigh waves are carried out. The present Rayleigh waves study is a fundamental step in analyzing the cause and effect of physical states such as building or structure damages resulting from natural dynamics. The results of the study generate a basic design formulation theory to test the effects of Rayleigh waves affecting structures when an earthquake occurs. The presence and uniqueness of the proposed formulation is verified by mutual comparisons of several numerical examples.

• Korean Security Journal
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• no.1
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• pp.409-423
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• 1997

Cash is apt to cause a accident in circulation process regardless of a time, a place and a subject due to its particularity. I propose a good service through circulation harmony by remodeling the system of the structure of cash supply and demand. And I propose accident prevention countermeasure by removing a caxh accident by the simplification, specialization and soientification of money business. I discuss the present condition and the points of cash transportation structure in Chapter 2 and the improvement plan of cash transportation structure in Chapter 3, and conclude in Chapter 4.

• 한국방재학회:학술대회논문집
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• 2007.02a
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• pp.90-93
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• 2007

The rainy season started in July, 2006 and the rainfall occurred much damage from July 26 to 28 for three days. Injae and Yangyang which many damage generated by rainfall was made applicable to research. Research of a study has grasped the damage aspect and present condition of Kangwondo. The cause of damage and the measure were concluded in consideration of the collapse characteristic.