• Nuclear Engineering and Technology
• /
• 제21권4호
• /
• pp.267-276
• /
• 1989

중저준위 방사성 폐기물 처분 안전성 평가에 이용될 수 있는 유한 차분법에 의한 수치모델을 개발하였다. 이 모델은 처분장이 암반내에 위치한 경우에 대하여 처분장 주위 지하 암반 매질에서의 핵종의 이동을 기술하는 것으로 암반내의 단일한 균열으로의 지하수에 의한 이동과 균열에 수직한 방향으로의 확산을 고려하여 일차원적으로 해석하였다. 수치모델은 해석해와 병행하여 처분장 안전성 평가에 있어서 유용하게 이용될 수 있는 것으로 보다 실제적인 경계조건을 사용할 수 있게 하고, 불균질한 암반매질에 대해 다중매질 모델링을 제공한다. 수치모델의 검증을 위하여 균열에서의 Sr-90 농도 Profile을 구하여 해석해와 비교하였고, 몇몇 경계 조건에 따른 영향을 비교하고 암반매질을 파라미터 값이 단계적으로 변하는 이중 매질에 대하여 확장하였다.

• 한방안이비인후피부과학회지
• /
• 제24권1호
• /
• pp.181-191
• /
• 2011

Backgrounds : Pompholyx is a distinctive reaction pattern presenting as symmetric vesicular hand and foot dermatitis. Other than acute symptoms like itching and vesicles, chronic changes with scaling, fissure and pain may follow. As patients are treated by steroid for a long period, it tends to present side effects after quitting steroid treatment. Objectives : This study was carried out to investigate the effect of carbon arc lamp therapy and oriental medical therapy that venesection therapy, ointments and herbal medicine on chronic plantar pompholyx including steroids side effects. Methods : We treated one case of chronic plantar pompholyx which had continued about 10 years, including steroids side effects with venesection therapy, carbon arc lamp therapy, ointments and herbal medicine. To evaluate the results of this treatment, we categorized symptoms into six items which are vesicles, itching, fissures, pain, erosions and scales. Results : Except mild itching, vesicles and scales in a small area, all the symptoms were subsided. Conclusions : It is considered that various kinds of oriental medical therapy including carbon arc lamp therapy could replace steroid therapy which has many side effects.

• 대한기계학회논문집A
• /
• 제27권3호
• /
• pp.455-463
• /
• 2003

The aim of this study is to investigate the hydrogen embrittlement of Zr-2.5Nb CANDU pressure tube at room temperature. The transverse tensile and fracture toughness tests were performed at various hydrogen concentrations using transverse tensile specimens and CCT (curved compact tension) specimens. These specimens were directly machined from the pressure tube retaining original curvatures. Based on the results of these tests. the hydrogen embrittlement phenomenon was clearly observed and fracture toughness parameters of Zr-2.5Nb pressure tube materials such as, $K_{J(0.2)}$.$J_{ML}$.dJ/da, were dramatically decreased with the increasement of the hydrogen concentration. From microscopic observation by SEM and TEM, it was also revealed that various shapes dimples, fissures and quasi-cleavage were found at the hydrogen-absorbed materials with hydrides while traditional shape dimples were generally located at the as-received materials Through the comparison of the hydride and fissure lengths with the hydrogen concentration the new evaluation method of hydrogen embrittlement was suggested.

• Neonatal Medicine
• /
• 제15권2호
• /
• pp.200-206
• /
• 2008

안면 기형, 삼각두, 뇌량 무형성, 감각 신경성 난청, 시각장애, 심기형, 심근병증, 폐동맥 고혈압, 배꼽 탈장과 생식기 기형이 있는 환아에게 동반된 9번 염색체 단완이질염색질 부위의 첨가를 발견하여 9번 염색체 p13 부위의 첨가와 연관된 다발성 기형의 발생을 보고하는 바이다.

• 한방안이비인후피부과학회지
• /
• 제28권1호
• /
• pp.134-142
• /
• 2015

Objective : This study was carried out to find out the effect of Korean medical treatments on tinea pedis with id reaction. Method : We treated a 33-year-old man was afflicted with tinea pedis complicating id reaction with herbal medicine, acupuncture, ointment, wet-dressing and steam treatment. After treatments, we measured the status of scales, fissures and the degree of pruritus. We followed up symptom changes by taking pictures and compared before and after. Result & Conclusion : Three days after admission, erythema occurred at upper and lower limbs and the degree of pruritus increased by id reaction. As tinea pedis improved, id reaction decreased, too. Consequently, both sites of primary lesions of tinea pedis and secondary id reactions were significantly improved, and accompanied symptoms were resolved simultaneously.

• 자원환경지질
• /
• 제30권1호
• /
• pp.15-23
• /
• 1997

Gold mineralization of the Ogkye gold mine was deposited mainly in quartz veins up to 150 cm wide which occupy fissures in Cambrian Pungchon limestone. Ore minerals are relatively simple as follows: pyrite, arsenopyrite, pyrrhotite, sphalerite, electrum and galena. On the basis of the Ag/Au ratio on ore grades, mode of occurrence and assoicated mineral assemblages, the Ogkye gold deposit can be classified as pyrite-type gold deposit (Group IIB). Fluid inclusion data indicate that ore minerals were deposited between $400^{\circ}$and $230^{\circ}C$ from relatively dilute fluids (0.2 to 7.3 wt.% eq. NaCl) containing $CO_2$. The ore mineralization resulted from a complex history of $CO_2$ effervescence and local concomitant boiling coupled with cooling and dilution of ore fluids. Gold deposition was likely a result of decrease of sulfur activity caused by sulfide deposition and/or $H_2S$ loss accompanying fluid unmixing. Sulfur isotope compositions of sulfide minerals (${\delta}^{34}S=3.5{\sim}5.9$‰) are consistent with ${\delta}^{34}S_{H_2S}$ value of 4.8 to 6.1‰, suggesting mainly an igneous source of sulfur partially mixed with wall-rock sulfur.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
• /
• 제23권1호
• /
• pp.31-35
• /
• 2012

Noonan syndrome is characterized by short stature, typical facial dysmorphology, and congenital heart defects. The main facial features of Noonan syndrome are hypertelorism with down-slanting palpebral fissures, ptosis, and low-set posteriorly-rotated ears with a thickened helix. The cardiovascular defects most commonly associated with this condition are pulmonary stenosis and hypertrophic cardiomyopathy. Other associated features are webbed neck, chest deformity, mild intellectual deficit, cryptorchidism, poor feeding in infancy, bleeding tendency, and lymphatic dysplasias. The patient is a 10-year-old boy. He had experienced repeated febrile convulsions. He had typical facial features, a short stature, chest deformity, cryptorchidism, vesicoureteral reflux, and mental retardation. His language and motor development were delayed. When he went to school, it was difficult for him to pay attention, follow directions, and organize tasks. He also displayed behavior such as squirming, leaving his seat in class, and running around inappropriately. Clinical observation is important for the diagnosis, so we report a patient who was diagnosed with Noonan syndrome, mental retardation, and attention-deficit hyperactivity disorder.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2011년도 제40회 동계학술대회 초록집
• /
• pp.360-360
• /
• 2011

In this work, SUS310S used for valve plate assembly was electron beam (EB) welded to determine the influence of the parametric conditions on the characteristics of the weld and to minimize porosity and micro-fissures among others. The evolution in the weld geometry and microstructure was examined as a function of the process conditions such as beam current and focusing current under a constant welding speed and accelerating voltage. The integrity of the EB welds in SUS310S was examined for defects (e.g. cracking, porosity, etc.), adequate penetration depth, and tolerable weld width deviation for the various welding conditions. Optical microscopy (OM), x-ray photoelectron spectroscopy analysis (XPS), scanning electron microscopy (SEM) and 3D micro-computed tomography (Micro-CT) for the cross section analysis of the electron beam welded SUS310S were utilized. The tensile strength and hardness were analyzed for the mechanical properties of the EB weld. At the 6 kV accelerating voltage, it was determined that a satisfactory penetration depth and desirable weld width deviation requires a beam current of 30 mA and a focusing current of 0.687 A at the welding speed of 25 mm/sec.

• 대한치과마취과학회지
• /
• 제10권2호
• /
• pp.190-196
• /
• 2010

Difficult airway management including difficult intubation, difficult ventilation and difficult mask ventilation is a life threatening issue during anesthesia care. A 23-year-old woman with Treacher Collins syndrome was scheduled for distraction osteogenesis. She had hypoplasia of mandible and malar bone, bilateral deformities of auricles with partial deafness and antimongoloid slant of the palpebral fissures. A 56-year-old woman with mandibular hypoplasia due to childhood trauma was scheduled for distraction osteogenesis. She had a history of difficult intubation. We anticipated a difficult intubation and ventilation. Fiberoptic bronchoscopic guided awake intubation was selected for anesthesia induction. After intravenous injection of midazolam and remifentanil, 10% lidocaine pump spray on the pharyngolarynx with a direct laryngoscope and on the nasal canal. However fiberoptic bronchoscopic guided awake intubation was failed due to severe gag reflex. After intravenous injection of propofol and remifentanil using the target controlled infusion (TCI), mask ventilation was easily performed and, after intravenous injection of vecuronium, fiberoptic bronchoscopic guided intubation was easily performed using a wire reinforced endotracheal tube. The operation was completed successfully without any adverse events.

• 산업기술연구
• /
• 제23권A호
• /
• pp.69-81
• /
• 2003

Numerical analysis is important for the design, construction and maintenance of large caverns. The rock mass contains generally discontinuities such as faults, joints and fissures. The mechanical behavior and geometric characteristics of these discontinuities would have a significant impact on the stability of the caverns. In this research the Distinct Element Method(DEM) was used to analyze the structural stability of the large cavern. The Barton-Bandis Joint Model (B-B J.M) was used as a constitutive model for the joint. In addition, two different cases 1) analysis with a support system and 2) analysis with no support system, were analyzed to optimize a support system and to investigate reinforcing effects of a support system. The most significant parameters of in-situ stress, JRC of in-situ natural joints, and spatial distribution characteristics of discontinuities were acquired through field investigation. Displacement (horizontal, joint shear), maximum joint opening, maximum and minimum principal stresses, range of relaxed zone, rockbolt axial forces and shotcrete stresses were calculated at each excavation stage. As a result of analysis the calculated values proved to be under the allowable value Rockbolts also proved to be an efficient support measure to control joint shear displacement which had significant effects on extending the relaxed zone. As a consequence, the structural stability of the cavern was assured with an appropriate support system.