• 콘크리트학회논문집
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• 제16권2호
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• pp.155-162
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• 2004

초기재령 콘크리트의 탄성계수 변화와 크리프 및 건조수축 현상을 고려하는 강 합성 거더의 시간종속적 처짐해석을 수행하였다. 초기재령 콘크리트의 탄성계수 발현과정을 고려한 구성관계는 총 응력-변형률 관계를 Taylor의 선형급수 확장을 이용하여 기준시간에 관하여 확장함으로써 시간종속적 증분형태로 유도하였다. 강 박스거더의 단면형상 변화 위치와 지점부를 기준하여 거더를 분할하고 분할된 구간에서 단면해석을 통해 곡률을 구하여 2차 다항식으로 가정한 처짐곡선에 경계조건을 적용함으로써 처짐곡선의 증분관계식을 유도하였다. 부모멘트 구간의 강 박스 하단에 콘크리트를 타설한 이중합성 박스거더의 초기재령 거동해석을 수행하였으며, 강 박스 하단의 콘크리트 타설두께가 거더의 거동에 주는 영향을 수치해석 결과를 통해 분석하였다. 끝으로, 보 요소를 이용한 유한요소해석 결과와 개발된 단면해석법을 이용한 해석 결과를 비교함으로써 정확성을 검증하였다.

• Archives of Plastic Surgery
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• 제40권5호
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• pp.564-569
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• 2013

Background Scalp defects may be caused by various etiological factors, and they represent a significant surgical and aesthetic concern. Various surgical techniques can be applied for reconstructive work such as primary closure, skin grafting, pedicled or free flaps. In this article, the authors share their clinical experience with scalp operations using the technique of local flaps and discuss the application of this method from the perspective of not only the size of the defect, but also in relation to the anatomical area, quality of surrounding tissue, and patient's condition. Methods During the period from December 2007 to December 2012, 13 patients with various scalp defects, aged 11 to 86 years, underwent reconstruction with local pedicle flaps. The indications were based on the patients' condition (age, sex, quality of surrounding tissue, and comorbidities) and wound parameters. Depending on the size of the defects, they were classified into three groups as follows: large, 20 to 50 $cm^2$; very large, 50 to 100 $cm^2$; extremely large, 100 $cm^2$. The location was defined as peripheral (frontal, temporal, occipital), central, or combined (more than one area). We performed reconstruction with 11 single transposition flaps and 1 bipedicle with a skin graft on the donor area, and 2 advancement flaps in 1 patient. Results In all of the patients, complete tissue coverage was achieved. The recovery was relatively quick, without hematoma, seroma, or infections. The flaps survived entirely. Conclusions Local flaps are widely used in scalp reconstruction since they provide healthy, stable, hair-bearing tissue and require a short healing time for the patients.

• 동의생리병리학회지
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• 제19권6호
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• pp.1673-1675
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• 2005

The pulse diagnosis is an important and universal method in Oriental medicine. Nevertheless, because of characteristic that depends on subjective sense of Oriental medicine doctor (OMD), it is not recognized by objective basis. The Korean Institute of Oriental Medicine(KIOM) and Daeyo Medi. Co. Ltd. developed the 3-D Mac using arrey piezoresistive sensors and multi-axial robot. 133 healthy subjects participated in this study, 75 males and 58 females, between 20 and 70 years of age. All subjects were relaxed in a supine position on a comfortable chair for twenty minutes before the measurement was taken. The measured position is the radial artery of subject's left wrist and the position is called Chon, Kwan and Chuck in Oriental medicine. To detect floating and sinking pulse, we established coefficient of floating and sinking(CFS). CFS means relative position of maximum pulse pressure in PH curve. The lower CFS value means that the pulse has floating tendency. There was significant diffence between CFS and diagnosis of floating-sinking pulse by OMD(p=0.020). CFS value of over 40's group was significantly larger than those of 20's and 30's(p=0.000). There was no significant difference between male and female(p=0.061).

• Journal of the Korean Wood Science and Technology
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• 제36권4호
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• pp.77-83
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• 2008

국내에서 생장한 주요 침엽수 3종(소나무, 잣나무, 리기다소나무)의 수간 내 마이크로피브릴 경사각(microfibril angle, MFA)의 축방향 및 방사방향 변이를 요오드 침적법에 의해 조사하였다. 각 수종의 MFA의 평균값은 소나무 $16.4^{\circ}$, 잣나무 $14.4^{\circ}$, 리기다소나무 $26.2^{\circ}$로 리기다소나무가 가장 크게 나타났다. 공시 수종의 MFA는 약 15~20 연륜까지 감소하다가 그 후 거의 안정된 경향을 보여 주었고 만재부의 MFA는 조재부의 MFA보다 다소 작은 경향이 있었다. 공시재료의 수고에 따른 MFA의 차이는 기부 부분에서 다소 크게 나타났으며 수고가 증가함에 따라 MFA는 감소하는 경향이 있었으나 리기다소나무 조재부는 예외였다. 따라서 MFA는 국내산 주요 침엽수재의 미성숙재와 성숙재를 구분하는 지표의 하나로 이용이 가능할 것으로 생각되었다.

• Imaging Science in Dentistry
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• 제48권3호
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• pp.201-212
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• 2018

Purpose: The aim of this study was to compare cone-beam computed tomography (CBCT) and digital panoramic radiography (DPR) for the detection of pulp stones. Materials and Methods: DPR and CBCT images of 202 patients were randomly selected from the database of our department. All teeth were evaluated in sagittal, axial, and coronal sections in CBCT images. The systemic condition of patients, the presence of pulp stones, the location of the tooth, the group of teeth, and the presence and depth of caries and restorations were recorded. The presence of pulp stones in molar teeth was compared between DPR and CBCT images. Results: Pulp stones were identified in 105 (52.0%) of the 202 subjects and in 434 (7.7%) of the 5,656 teeth examined. The prevalence of pulp stones was similar between the sexes and across various tooth locations and groups of teeth (P>.05). A positive correlation was observed between age and the number of pulp stones(${\rho}=0.277$, P<.01). Pulp stones were found significantly more often in restored or carious teeth (P<.001). CBCT and DPR showed a significant difference in the detection of pulp stones(P<.001), which were seen more often on DPR than on CBCT. Conclusion: DPR, as a 2D imaging system, has inherent limitations leading to the misinterpretation of pulp stones. Restored and carious teeth should be carefully examined for the presence of pulp stones. CBCT imaging is recommended for a definitive assessment in cases where there is a suspicion of a pulp stone on DPR.

• 대한한방소아과학회지
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• 제13권1호
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• pp.191-204
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• 1999

Background: Nasal polyps are benign mass of nasal mucose, chronic sinusitis are swelling of nasal mucose, so nasal polyps and chronic sinusitis take a place at the same time. Nasal polyps are located lateral wall of nose, middle meatus, between middle nasal concha and inferior nasal concha. Objective: To demonstrate the effect of herbal medicine therapy in the chronic sinusitis and nasal polyps before and after treatment using computed tomography (CT). To compared before and after treatment of otitis media using earscope. Materials and methods: Five patients (4 mail and 1 femail) treated in our hospital between August 1998 and July 1999 were studied. Ages ranged from 9 to 23 years (mean age:13 years). All patients had a underlying family history, and past history(allergy or sinusitis of parents or brothers). Illness period was from 1 to 36 months (mean period:10.5 month). To ascertain the efficacy of treatment, CT were checked out. In the CT, three images were obtained 2cm interval on the coronal and axial plan. We classified treatment period into the type of allergic disease. Gamihyunggyeyungyo-tang was administered mainly. Gamigwaghyangjeungki-san, Gamizwakwi-eum and Gamihyangso-san were administered for through oral route additional symptoms. Results: Treatment period was from 126 to 157 days (mean period:140.7 days). To 3 patients with chronic sinusitis and nasal polyp, treatment period was 140.7 days, to 2 patients with otitis media and chronic sinusitis and nasal polyp, treatment period was 141.5 days. So they had no significance. Not nasal polyp from middle meatus, but also polypoid mucosal change of maxillary sinus is polyps Conclusion: We know that herbal medicine therapy is the effective treatment of pediatric chronic sinusitis and otitis media using earscope and CT. Herbal medicine therapy was effective in increasing immunity, inhibiting allergic reaction and inflammation of respiratory system. we practice ECP(eosinophil cataionic protein) and MAST examination, objectify herbal medicine therapy.

• 대한한방소아과학회지
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• 제13권1호
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• pp.205-226
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• 1999

Background: Pediatric chronic sinusitis and otitis media were often recurred, so patients are increased. But there are a few reports on the herbal medicine therapy treating pediatric chronic sinusitis and otitis media, this report was studied. Objective: To demonstrate the effect of herbal medicine therapy in the chronic sinusitis before and after treatment using computed tomograpy(CT). To compared before and after treatment of otitis media using earscope. Materials and methods: Eighteen patients (10 mail and 8 femail) treated in our hospital between April 1998 and June 1999 were studied. Ages ranged from 4 to 11 years (mean age :6.6 years). All patients had a underlying family history (allergy or sinusitis of parents or brothers). In the past history, 56% patients atopic dermatitis. Illness period was from 2 to 48 months (mean period: 13.9 month). Mean duration of treatment were 95.6 days. To ascertain the efficacy of treatment, CT were checked out. In the CT, three images were obtained 2cm interval on the coronal and axial plan. Gamihyunggyeyungyo-tang was administered mainly. Gamigwaghyangjeungki-san, Gamizwakwi-eum and Gamihyangso-san were administered for through oral route additional symptoms. Results: The symptoms of otitis media were hearing loss and edemation. The symptoms of chronic sinusitis were nasal obstruction(78%), purulunt or mucosal discharge(67%), cough(61%), postnasal dripping (44%) and nose bleeding(28%). Before the oriental treatment in the our hospital, all patients have been antibiotic therapy at the pediatrics or during the three months and recurrent otitis media from twice to tenth Correlation illness period and. treatment period were not significant statistically. Conclusion: The treatment period of the otitis media was more short than chronic sinusitis because the otitis media had been not recurrent on the 30 percent improvement of the chronic sinusitis. We know that herbal medicine therapy is the effective treatment of pediatric chronic sinusitis and otitis media using earscope and CT.

• 대한치과교정학회지
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• 제21권3호
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• pp.673-683
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• 1991

This research was performed to find out the adaptation patterns of maxillary and mandibular posterior teeth to the changes in relationships of vertical skeletal components, which constitute the skeletofacial complex. For this research, 61 adult malocclusion patients were chosen as subjects according to the Hellman's dental age with normally ranged FMN-A-B angle. These subjects were divided into 4 groups in maxilla and 3 groups in mandible according to mesiodistal inclinations of teeth. Following results were obtained after studying the relationships of the vertical skeletal components between each group. 1. Inspire of the fact that the FMN-A-B angle was within a normal range, the degree of mesiodistal inclinations of maxillary and mandibular posterior teeth showed differences in relation to the anteroposterior relationships of maxilla and mandible. In case where the FMN-A-B angle was large, the mesial inclinations of maxillary posterior teeth showed more increase from the posterior to the anterior, whereas in mandible it showed overall decrease. 2. The degrees of mesial inclinations of mandibular posterior teeth were increased when the angulations of lower facial height, occlusal plane angle and mandibular plane angle were greater. 3. The patterns of mesial inclinations of maxillary posterior teeth were varied according to the angulation of lower facial height. If relatively large, it showed more increase from the posterior to the anterior and it was decreased nearly consistent when the angulation was small. 4. The degrees of mesial inclinations of maxillary posterior teeth were decreased as the lower facial height, palatal plane angle, occlusal plane angle and the mandibular plane angle became greater.

• Biomaterials and Biomechanics in Bioengineering
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• 제3권1호
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• pp.27-35
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• 2016

Anterior knee pain is a major problem among adolescents and young adults especially those who participates in sports. The most common pathogenesis of anterior knee pain can arise from compression and shear forces in the patellofemoral joint. It is also caused by impingement of infrapatellar fat pad. Fat pad impingement can occur when the fat pad becomes swollen and inflamed due to a direct blow or chronic irritation. As a result, the bottom tip (or inferior pole) of the patella can pinch the fat pad. One of the many causes of swollen fat pad can be secondary to anterior cruciate ligament (ACL) injury. The aim of this study was to compare the infrapatellar fat pad volume in patients with acute ACL injury and a group of age-, gender-, and activity- matched controls with intact ligament. Axial magnetic resonance (MR) images have been performed on 32 patients with torn ACL and 40 control patients. The volume of the fat pad was measured digitally from MR image by using a 3d Reconstruction software, ellipsoidal approximation, and a MATLAB code. The results were compared between patients with torn ACL and control group. Patients with a torn ACL had a significantly larger fat pad than the controls (P=0.01). There was no significant difference between the methods used to measure the infrapatellar fat pad volume (P=0.83-0.87). Thus, lesions of the infrapatellar fat pad is often associated with ACL injury.

• Clinics in Orthopedic Surgery
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• 제10권4호
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• pp.433-438
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• 2018

Background: Cervical foraminal stenosis (CFS) is one of the degenerative changes of the cervical spine; however, correlations between the severity of stenosis and that of symptoms are not consistent in the literature. Studies to date on the prevalence of stenosis are based on images obtained from the departments treating cervical lesions, and thus patient selection bias may have occurred. The purpose of this study was to investigate the prevalence of CFS according to the site, extent, and morphology of stenosis using cervical computed tomography (CT) images obtained from patients who were visiting not because of symptoms related to the cervical spine, cervical pain, or upper limb pain. Methods: Among patients who underwent CT from January 2016 to March 2016 for reasons other than cervical spine symptoms, a total of 438 subjects were enrolled, and 2,628 cervical disc images (C4-5, C5-6, and C6-7; left and right sides) were examined. Three orthopedic surgeons performed two measurements each at 4-week intervals. Values were used for analysis if matched by more than two surgeons; if no match was found, the median values were used for analysis. The left and right sides on the same axial image were independently classified. Results: Left C5-6 stenosis was most common (24.66%) among patients. At the left C6-7, there were 20 focal types and 33 diffuse types. At bilateral C4-5 and right C6-7, the focal type was more common, whereas at bilateral C5-6 and left C6-7, the diffuse type was more common. Age and the severity of stenosis showed statistically significant correlation at all cervical levels. Conclusions: The prevalence of CFS was highest at the C5-6 level (19.06%). Compared to other levels, focal stenosis was more frequent at C4-5 and diffuse stenosis was more common at C5-6. At C6-7, the incidence of focal stenosis was higher on the right side and that of diffuse stenosis was higher on the left side.