• Proceedings of the Korean Society For Composite Materials Conference
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• 2002.10a
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• pp.202-207
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• 2002

The soundness of honeycomb core sandwich and laminate structure used for commercial aircrafts is generally evaluated with ultrasonic inspection because the inspection is most sensitive to planar surfaces which are perpendicular to sound propagation pass and reflects sound almost 100％ to equipment. And most defects inherent in composite material curing process has good reflective surfaces. With all this advantage, unexpected obstruction to product and additional cost could be occurred when inappropriate accept/reject criteria is given. In this study the importance of inspection criteria will be discussed to show how inappropriate criteria cause unexpected results leading to high production cost and how much time must be spent to correct those improper criteria with an actual case occurred in Aerospace Division, Korean Air.

• Proceedings of the KSME Conference
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• 2002.08a
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• pp.663-666
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• 2002

Hard disk drived (HDD) in computer are used extensively as data storage capacity. The trend in the computer industry to produce smaller disk drives rotating at higher speeds requires an improved understanding of fluid motion in the space between disks. The distribution of pressure disturbance on disks has relation to flow structure. To investigate the flow structure, time-resolved hot-wire measurements of the circumferential velocity component were obtained for the flow between the center pair of four disks of common radius $R_2$ coretating at angular velocity ${\Omega}$ in a fixed cylindrical enclosure. Hot-wire supporter acts as an obstruction in this case. The effects of rotating speed and size of hot-wire supporter diameter between disks on the flow driven by disks were investigated. Velocity spectra at the fixed space were measured to obtain the structure of inner and outer region in flow field.

• Journal of the Korean Society of Safety
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• v.21 no.6 s.78
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• pp.46-54
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• 2006

Fire extinguishing experiment was conducted with water mist nozzle in case of the pool fire, cascade fire and spray fire on flammable liquid of class B whether water mist system can be effective system for power transformer fire scenario. In the event of a pool fire, flow rate and time to extinguish was inclined to be increased according to the obstruction rate of ignition space. Furthermore, the performance of fire extinguishing depended upon the spraying angle of the nozzles. In case of cascade fire, the effect of extinguishment was began to show from a combustion pan filled with fuel and fuel flowing plate later on.

• Journal of the Korean Society of Safety
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• v.9 no.4
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• pp.17-28
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• 1994

Chip breaking is important in lathe work for maintaining good surface of the products and safety of operator. The purpose of this study is to investigate the performance of chip breaking and chip shape resulted from the carbide inserts with grooved type and obstruction type chip breaker. Experiments have been performed under the following cutting conditions, (1) constant cutting speed with variable depth of cut and feed rate, (2) constant depth of cut with variable cutting speed and feed rate. Also, the flying distance of chip and it's distribution have been investigated. As a results, good performance of chip breaking can be obtained for small radius of curvature and land width of grooved type chip breaker. And the thickness of chip increase with the increase of feed rate and decrease of cutting speed, and the chip breaking becomes easier with the increase of chip thickness due to the large deformation rate. Obstraction type chip breaker shows better performance of surface roughness than the grooved type. The flying distance of the chips over 90% are less than 1 meter, and the distance decreases as the feed rate decreases.

• Journal of the Korean Solar Energy Society
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• v.23 no.4
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• pp.97-107
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• 2003

Recently, the apartment building has been constructed in large quantities to provide housings due to the gravitation of population towards large cities. However, we're faced with a critical problem of deterioration of our dwelling environment caused by the trend toward high-rise apartment which could be an obstruction in obtaining sufficient sunlight. Therefore, there have been several legislative actions against infringement on the right of sunshine. In the building law, sunshine hours and the minimal separated distance between apartments are regulated as the criteria for the site planning, However, the minimal separated distance was defined without consideration of the parameters like building orientation and thermal effect of the sunshine hours in the site planning for the apartment building. In this study, the sunshine hours and heating energy during the underheated season for various arrangements in site planning are carefully considered and analyzed.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.11 no.1
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• pp.284-291
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• 1998

we clinicallly observed 48 patients with allergic rhinitis who visited Kyoung-Won univ. Oriental hospital from 1996. 3 to 1998. 4. Their chief complaints were nasal obstruction, sneezing, watery rhinorrhea. They were also troubled with itching sensation of eye ball, dryness of nasal cavity or throat, photophobia and lacrimation, ect. The results were as follows: 1. In the classification of Sasang constitution, Taeum-group patients visited most frequently and ,the treatment to the taeum-group patients was most effective. 2. There were no differences between inhalant and climatic factor at the improvement rate of allergic initiator. 3. During the aflected time, the shorter termwas the higher improvement rate was. 4. The patients with no complication were treated better than those who accompanied with other nasal diseases.

• Korean Journal of Bronchoesophagology
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• v.16 no.2
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• pp.83-90
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• 2010

The pathophysiology of Gastroesophageal reflux disease (GERD) has been known that it is developed when the offense-primarily the gastric acid-pepsin content of the refluxate-overcomes a 3-tiered esophageal protective defense. consisting of antireflux mechanisms, luminal clearance mechanisms, and tissue resistance. Laryngopharyngeal reflux (LPR), which is known as an extraesophageal variant of GERD, has been considered to be developed by transient lower esophageal sphincter relaxation (TLESR), direct mucosal injury by gastric contents, more sensitive mucosa compared to esophagus, and absence of buffering effect and aggravation of the injury due to pepsin. However, hypothesis of the pathophysiology in both entities are numerous and still lack of understanding for being a theory. There is no conflict that understanding the pathophysiology is necessary for resolving the problems of these diseases and numerous studies and results have been releasing. This review could provide clinicians dealing with GERD and LPR with applicable new information and help for overcoming the clinical obstruction.

• Journal of Physiology & Pathology in Korean Medicine
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• v.23 no.6
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• pp.1465-1469
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• 2009

Acute cholecystitis represents an acute inflammation of the gallbladder, caused in most instances by obstruction of the cystic duct, resulting in acute inflammation of the GB wall. Acute cholecystitis usually occurs with right upper quadrant pain and tenderness. This study was designed to evaluated of oriental medicine on acute cholecystitis. The patient who were suffering from acute cholecystitis was treated with herbal medicine such as Gagamsaenggan-tang. After using Gagamsaenggan-tang, we could find remarkable effect on clinical symtoms and lap findings and Abdominipelvic Ultrasonography study. According to results we suggest oriental medical treatment was effective for this patient with acute cholecystitis, but more extensive research is needed.

• The Korean Journal of Cytopathology
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• v.2 no.1
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• pp.56-61
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• 1991

Curschmann's spirals morphologically similar to those seen in sputum were found in cervico-vaginal smears of six patients ranged from 28 to 40 years of age, during 18 months from January. 1985 to June 1986. The prevalence was 1 in 2147 smears in that period. All of them had gynecologic disorders without systemic effect such as chronic cervictis in three, leiomyoma in one, pelvic inflammatory disorder in one, and primary infertility in one. The Curshmann's spirals in the smear showed varying degrees of maturation from wavy incipient ones to highly celled mature ones, admixed with thick mucinous back-ground, suggesting of their production in the uterine cervix itself. Also the recent history of undergone cryocautery, electrocautery or parturition suggest its production in the endocervical gland due to mechanical obstruction and/or change in biochemical composition of mucus.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.14 no.2
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• pp.1-8
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• 2001

We know paranasal sinusitis is one of the most common disease in the field of otolaryngology. Especially in the case of chronic paranasal sinusitis, patient is sufferred from recurrence. So we prescribed Bojungikgitang(補中益氣湯) to the patients who were suffered from chronic paranasal sinusitis, and we witness some noticeable improvement. Here are the findings of my experience 1. The addition and subtraction temperament drugs of Bojungikgitang(補中益氣湯加減方) are effective to the patient of chronic and feeble paranasal sinusitis by the effect of removing wind(祛風), unnecessary metabolite(祛痰), and draining pus(排膿) and strengthening digestive organs(健碑) and enriching the lung yin(益肺陰) and alleviation of pain(止痛). 2. In the symptom of chronic paranasal siunutitis, nasal obstruction, postnasal drip, sputum, headache were quick to disappear, and dysosmia, internasal polyp, etc got better slower. 3. The most quick improvement appeared within two weeks and most symptoms improved within one month, and disappeared within two months.