• The Journal of the Acoustical Society of Korea
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• v.27 no.7
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• pp.365-371
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• 2008

In this study, beat control method using an equivalent ring model is proposed to control beat period of a slightly asymmetric ring. Slight asymmetry in a ring generates mode pair and the interaction of the mode pair makes beat in vibration and sound. In a ring, as a simplified bell type structure, mode data are measured and an equivalent ring is determined so that the measured mode condition is satisfied. By the finite element analysis on the equivalent ring, changes of mode pair condition are predicted when local mass is attached or the local thickness is decreased. The predicted results are compared with the experimental result and the validity of the proposed method is verified.

• The Journal of Korean Medicine
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• v.23 no.1
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• pp.100-111
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• 2002

Objectives : In order to obtain the clinical type of facial palsy sequelae and try to make the treatment protocols for each, I observed patients who visited Gunpo-Wonkwang oriental medicine center with Bell’s palsy sequelae that were treated over three months. Methods : I make the value standard of muscle paralysis, contraction, synkinesis and acquired the results as follows. Results and Conclusions : 1. The distribution of age and sex was as follows : females of 41-50 years were the most common demographic, females of 51-60 years and males of 31-40 years were the second, males of 51-60 years were the third, females of 21-30 years and males of over 60 years were the fourth, and males of 41-50 years were the fifth. 2. The distributions of period of disease were as follows : 3-6 months was the most, 12-18 months was the second, 6-12 months and over 24 months was the third, and 18-24 months was the fourth. 3. The sequelae distributions of disease were as follows. In the group of 3-6 months, 12 persons (80%) showed palsy and atrophy, 10 persons (66.6%) showed synkinetics. In the group of over 6 months, all patients showed muscle palsy, muscle atrophy and synkinetics. All groups showed lower sensitivity of muscles, but the group of 18-24 months and the group of over 24 months showed more. Tinnitus was shown by the groups of 12-18 months and 3-6 months. Facial muscle pain was shown by the group of3-6 months only, Crocodile's tear was shown by the groups of 18-24 months and over 24 months. 4. The total palsy rates of sequela patients and palsy rates by muscle for disease period were as follows. The total palsy rate was 27.94%; the palsy rates for the group of 6-12 months and the group of over 24 months was lower than the total palsy rate. The rates of the groups of 3-6, 12-18, 18-24 months were higher than the total palsy rate. The palsy rate of zygomatic minor, levator labii superior muscle was higher than the total palsy rate for all groups. 5. Synkinetics manifestation rates by disease period were as follows. Total synkinetics manifestation rate was 73.81 %; the manifestation rate of the group of 6-12 months was lower than total synkinetics manifestation rate. For the groups of 12-18, 18-24, and over 24 months it was more than the total synkinetics manifestation rate. The group of over 24 months, total synkinetics induced by orbicularis oculi muscle and orbicularis oris muscle. 6. Facial muscle atrophy rates by disease period were as follows. Total atrophy rate was 5.26%; in the groups of 6-12, 18-24, over 24 months, the atrophy rates were higher than the total atrophy rate. The groups of 3-6 and 12-18 months showed lower than the total atrophy rates, while the atrophy of the levator palpebrae superioris muscle and levator palpebrae inferioris muscle was higher than in other groups.

• Conservation Science in Museum
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• v.4
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• pp.71-78
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• 2003

The wooden striker on the Divine Bell of King Seongdeok was examined to identify the species of the wood and the outdoor wood weathering caused by solar light, moisture, temperature and air. The species of the wooden striker was identified to Zelkova serrata. When observed the striker with naked eyes, the results were surface discoloration (graying), cracking and roughness. In order to examine the morphological changes according to deterioration type, the specimen were separated to three part(I, II,III-spot). The I-spot was discolored to gray and at the same time entirely covered with dust. So the observation was impossible. The II-spot was also discolored but its texture could be observed. On it could observe numerous fungal hypae and dirts like dust flown into the cell lumens. The cell wall has been so weakened by weathering that it lost the physical intensity. This have made microchecks and splits on the cell wall. Although fungal hypae covered the cell, they did not result in wood decay. The III-spot, located just 0.5 mm below the surface, was maintaining the natural red-brown color of the wood. Its cell wall was similar to that of sound wood. These changes are different from wood decay, and limited only to the surface of the striker-less than or equal to 0.5 mm below.

• Journal of the Korean Child Neurology Society
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• v.26 no.4
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• pp.288-291
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• 2018

Hemiplegic migraine (HM) is a rare subtype of migraine with aura and is accompanied by a fully reversible motor aura. HM can occur in two forms: familial or sporadic. Currently, three genes are related to familial HM. Typically, HM occurs in the first or second decade of life and involves gradually progressing aura symptoms in succession, accompanied by headaches. The aura includes visual, sensory, motor, aphasic and often basilar-type symptoms. Motor aura (weakness) is related to the regions where the sensory aura is involved, and it usually starts at the hand before spreading to the arm and face. Aphasia is a common form of speech aura, but does not typically present as a difficulty in understanding. In this case report, the sensory-motor aura started at the right face and then gradually progressed to the right leg without any symptoms in the ipsilateral upper extremity. To the best of my knowledge, there has been no previous case report for the presentation of a hemiplegic migraine, as in this case report. As there is a possibility of misdiagnosis of Bell's palsy at the early stage of this case, this case report suggests that a physician should consider the rare possibility of stroke or HM when a patient presents with unilateral facial palsy.

• Journal of Acupuncture Research
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• v.18 no.1
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• pp.237-247
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• 2001

Background : infection associated with otalgia, herpetic eruptions, facial palsy, trigeminal pain and cochleovestibular dysfunction such as hearing dishubance, tinnitus, vertigo and other symptoms, and is not frequently encountered in otolaryngologic field. And facial paralysis occured by this syndrome is rapid in onset, usually severe in degree, and poor in prognosis. Objectives : To evaluate the Oriental Medicine's treatment and prognosis of Herpes zoster oticus and to classify of peripheral Facial palsy on Oriental Medicine. Methods : Clinical observation and analysis about a case of Ramsay-Hunt syndrome III type was done, who visited Dongguk University Gangnam Hospital. This case is managed by integrated therapy of oriental and western medicine. In oriental medicine, to treate ear pain, heonggae-yeongoetang(荊芥蓮翹湯) was given and to treat herpetic eruption, 8 constitution acupuncture treatement was done. In western medicine, antiviral agent, acyclovir and steroid hormone, prednisolon were treated. Result : About 6 weeks treatment, this case which has worse prognosis than Bell's palsy, was completed cured without any complication. Conclusion : 1. Futher divided classification about non-infectious and infectious facial palsy include "Ramsay Hunt Syndrome" is needed. 2. In acute state, Jeonyohwadan's (纏腰火丹) treatement can be applied, but the difference of invasion part, primary symptom such as ear pain and herpetic eruption is needed another treatment. 3. Ear pain and herpetic eruption can be treated in part of poongyeol(風熱) and subyeol(濕熱). 4. In Acupuncture treatement, Jeonyohwadan's (纏腰火丹) treatement can be applied in acute stage and guanwasa's treatement can be applied in chronic stage. but futher research is needed. 5. This case, Ramsay Hunt Syndrome IlI type, was managed by integrated therapy such as heonggae-yeongoetang(荊芥蓮翹湯), 8 constitution acupuncture treatement, acyclovir and prednisolon and this treatement was good effect.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1995.04a
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• pp.196-201
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• 1995

The broadband and discrete sources of sound in small cooling fans of propeller type and centrifugal type were investigated to understand the turbulent vortex structures from many bladed fans using ANSI test plenum for small air-moving devices (AMDs). The noise measurement method uses the plenum as a test apparatus to determine the acoustic source spectral density function at each operating conditions similar to real engineering applications based on acoustic similarity laws. The characteristics of fans including the head rise vs. volumetric flow rate performance were measured using a performance test facility. The sound power spectrum is decomposed into two non-dimensional functions: an acoustic source spectral distribution function F(St,.phi.) and an acoustic system response function G(He,.phi.) where St, He, and .phi. are the Strouhal number, the Helmholtz number, and the volumetric flow rate coefficient, respectively. The autospectra of radiated noise measurements for the fan operating at several volumetric flow rates,.phi., are analyzed using acoustical similarity. The rotating stall in the small propeller fan with a bell-mouth guided is mainly due to a leading edge separation. It creates a blockage in the passage and the reduction in the flow rate. The sound power levels with respect to the rotational speeds were measured to reveal the mechanisms of stall and/or surge for different loading conditions and geometries, for example, fans installed with a impinging plate. Lee and Meecham (1993) studied the effect of the large-scale motions like impinging normally on a flat plate using Large-Eddy Simulation(LES) and Lighthill's analogy.[ASME Winter Annual Meeting 1993, 93-WA/NCA-22]. The dipole and quadrupole sources in the fans tested are shown closely related to the vortex structures involved using cross-correlations of the hot-wire and microphone signals.

• IE interfaces
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• v.23 no.4
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• pp.337-348
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• 2010

The Bass model is the most widely used model in research of new product diffusion because it presents a nice explanation on the diffusion process of new products. However, it has a limitation that its performance of fitness is lower as the available data become less and also, the diffusion curve is bell-shape and so, it can not represent the various diffusion patterns. Recently, a two-pieces Bass model is developed and applied to analyze diffusion of 10 products. The results are encouraging in terms of fitness. However, diffusion pattern is not dealt with in the paper. In this paper, analysis of diffusion pattern is in depth addressed in two-pieces Bass model. It is shown that the diffusion curves are divided into 3 types with respect to the peak adoption rate and each type is divided into 2 types further. Takeoff time of a diffusion process is analyzed by using the inflection point and regime-change time where it represents the point that imitation and innovation parameters change. Empirical studies for 68 products(28 domestic products and 40 USA products) are performed to analyze the diffusion pattern. Findings are that diffusion patterns of all products except 1 USA product show type I and regime-change time becomes shorter as the introduction time of the product is later in domestic products and regime-change time can be regarded as a takeoff time in 47% of total 68 products.

• Journal of the Institute of Convergence Signal Processing
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• v.14 no.4
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• pp.222-230
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• 2013

Retinal bipolar cells according to the light stimulus respond to potential slowly, emit neurotransmitter release(glutamine acid) to depend on membrane potential. In this paper, the several physiological information on neurotransmitter release mechanism in the presynaptic terminal of the ON-type bipolar cells are incorporated into the formula model. The source of fast components and slow components of neurotransmitter release was arranged in parallel, this model was able to reproduce the membrane potential and intracellular $Ca^{2+}$ concentration dependence of neurotransmitter release faithfully. In addition, because the fast releasable components of neurotransmitter was represented by the membrane potential dependence of trapezoid type, whereas the slow releasable components was represented by the membrane potential dependence of a bell type, $Ca^{2+}$ concentration rise in intracellular is suppressed by $Ca^{2+}$ buffer to reduce slow releasable components, it was confirmed that the membrane potential dependence of neurotransmitter release was characteristics of a trapezoid type. And, in the light response of ON type bipolar cell, the result of the simulation of the neurotransmitter release caused by the components of transient and persistent was that the start of light response occurred the fast release of neurotransmitter, it was confirmed that the transient component and persistent component of the light response occurred the slow release. It was confirmed that the later of persistent component of the light response occurred due to the continuous release by synaptic vesicle supplemented from the storage pool.

• Applied Microscopy
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• v.38 no.1
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• pp.21-28
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• 2008

Carnivorous plants vary in their unique features of morphology, ultrastructure and biochemical properties by species. Furthermore, prey-capturing mechanism as well as structural and physiological adaptations have been used for grouping various carnivorous species. In Drosera plants, glandular trichomes, which develop in the leaf epidermis, are known to play the most important role during the prey capturing process. The present study examined such trichomes, focusing on the glandular type, in leaves of Drosera anglica using scanning and transmission electron microscopy. Three types of rudimentary glandular trichomes were found to develop within the folded leaf primordia and immature leaf during early development. The first type, stalked glandular trichomes (Type I), occurred on the margin and upper epidermis of the leaf. With maturation, the longest glandular trichomes having lengthy stalks, ca. $2.2{\sim}5.1\;mm$, developed along the margin, while shorter stalked trichomes, ca. up to $200\;{\mu}m$, were found on the inner leaf blade. The shorter ones consisted of a globose head having two layers of secretory cells, parenchyma bell cells and tracheids and a multicellular stalk. The stalks gradually decreased in length in centripetal fashion. The second type, Type II, having ca. $15{\sim}30\;{\mu}m$ short stalks, also developed along the inner blade. Both types secreted mucilage from the secretory cells which had a thin cell wall and cuticle layer. The sessile six-celled glandular trichomes were the third type, Type III, and were $25{\sim}40\;{\mu}m$ in length. They were distributed most commonly throughout the upper and lower epidermis, petiole and even on the stalk surfaces of the first two types of trichomes. The third type was also found to be involved in the active secretion. In prey capturing leaves, all trichome types secreted substances through thin cuticles in the head cell wall, which exhibited relatively loose wall components.

• Korean Journal of Adult Nursing
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• v.15 no.2
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• pp.305-315
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• 2003

Purpose: To describe the status of the laboratory facilities, equipment and expenses for practice in a four-year nursing schools and to analyze mandatory requirements for laboratory facilities and equipment. Method: A descriptive survey research design was used. The participants were 49 of the 4-year nursing schools across the nation. The data were collected by e-mail. The return rate for questionnaires was 63.3% (n=31). Result: In 2001 the total expenses for laboratory practice were 21,865,230 won and the average per student was 102,418 won. Types of laboratories included single and complex. The mean size for laboratories was $318.7m^2$ and mean size for laboratories for fundamental nursing was $161.1m^2$. The range for number of students in a laboratory class was 20-30 for eight universities (30.8%). Among required laboratory equipment, items that were deficient in 50% in the universities were mercury and aneroid sphygmomanometers for children, electronic sphygmomanometers, Bell type fetal stethoscopes, sheepskin, beds for children, for gynecology, and electronic hilo beds. Among the elective equipment, items that were deficient in 50% of the universities were $O^2$ tents, Blackmore tubes, retractors, hot-water supply, and incentive spirometers. The number of items that needed to add to the equipment were 10 for required equipment and 22 for elective equipment. Conclusion: A standardized mandatory list of equipment for laboratory facilities and expenses for practice in 4-year nursing schools needs to be developed.