환율, 금리, 주가사이의 동적연관성 연구

조혜원(hye-won cho),홍정효(Chung-Hyo Hong) 한국산업경제학회 2009 한국산업경제학회 정기학술발표대회 논문집 Vol.- No.추계

Thermal Cycling에 따른 자가중합 레진의 결합강도에 관한 연구

조혜원,하점임,Cho, Hye-Won,Ha, Jum-In 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.4

The purpose of this study was to evaluate the effects of two metal adhesive primers on the shear bond strengths of self-curing resin to Ni-Cr a]toy and the effects of 1000 thermal cycling on the durability of the bond. The two selected metal adhesive primers were Metal Primer II(G-C corp., Japan) and MR Bond(Tokuyama corp., Japan) and no treatment groups were used as control. All specimens were divided into two groups according to thermal cycling. In the group without thermal cycling, the specimens were stored in water for 24 hours. In the group with thermal cycling, the specimens were thermocycled 1000 times at temperature of $5^{\circ}C\;and\;55^{\circ}C$. Shear bond strengths were measured using the Universal testing machine(Zwick 145641, Germany) with a crosshead speed of 0.5 mm/min. The results were as follows: 1. MR Bond significantly improved the shear bond strength of resin to Ni-Cr alloy before and after thermal cycling. 2. There were no difference in the shear bond strength of resin to Ni-Cr alloy between Metal Primer II treated group and no treatment group. 3. Regardless of the type and the use of adhesive primers, there were tendency of decrease in shear bond strength with 1000 thermal cycling.

소양인(少陽人) 아토피 피부염에 감수말(甘遂末) 공하법(攻下法)을 병행한 한방요법 치험(治驗) 2례

조혜원,이재욱,이성진,임은철,김동욱,Cho, Hye-Won,Lee, Jae-Wook,Lee, Sung-Jin,Lim, Eun-Chul,Kim, Dong-Uk 사상체질의학회 2015 사상체질의학회지 Vol.27 No.3

Objectives We report a series of 2 cases which is based on Sasang constitutional Medicine for Atopic dermatitis in Soyangin using oriental medeicine therapy with Euphorbiae Kansui. Radix (Gam-sui) Methods We treat 2 Soyangin patients that had Atopic dermatitis. We prescribed oriental medeicine therapy with Euphorbiae Kansui. Radix (Gam-sui) for their physical symptoms. The improvement of their Atopic dermatitis was evaluated. Results After using oriental medeicine therapy with Euphorbiae Kansui. Radix (Gam-sui), patients' physical symptoms were improved. Conclusions These case studies showed an efficient result of using oriental medeicine therapy with Euphorbiae Kansui. Radix (Gam-sui) in the Atopic dermatitis of Soyangin.

정밀 부착형 유지장치에 따른 양측성 유리단 국소의치의 광탄성 응력분석

조혜원,장익태,Cho, Hye-Won,Chang, Ik-Tae 대한치과보철학회 1985 대한치과보철학회지 Vol.23 No.1

The purpose of this study was to evaluate the stress patterns developed in supporting structures by removable partial denture with attachment retainers. The attachments tested were Dalbo(miniature) attachment, resilient Ceka attachment, rigid Ceka attachment, precision and sleeve attachment, and R.P.I. clasp as a contrast. 3-dimensional photoelastic stress analysis was used to record the isochromatic and isoclinic fringe patterns and to calculate principal stress components at measuring points. The results showed that: 1. The maximum compressive stress on residual ridge was produced under the loading point with Dalbo and resilient Ceka attachment, distal to the loading point with rigid Ceka and precision and sleeve attachment, and mesial to the loading point with R.P.I. clasp. 2. The Dalbo attachment produced the most stress on residual ridge, and the least stress on abutment teeth. and resilient Ceka attachment showed favorable stress distribution. 3. Rigid Ceka attachment produced higher compressive stress on buccal. alveolar crest, and precision and sleeve attachment produced higher compressive stress on distal alvelolar crest and mesial surface of the root apex in abutment teeth. 4. R.P.I. clasp produced higher compressive stress on mesial alveolar crest.

금 실린더의 제작법과 고정 방법이 임플랜트 지대주의 preload에 미치는 영향

조혜원,김성훈,Cho, Hye-Won,Kim, Sung-Hoon 대한치과보철학회 2000 대한치과보철학회지 Vol.38 No.5

The purpose of this study was to evaluate the effects of fabrication and tightening methods of gold cyliner on the preload of the standard abutment. Three linear strain gauges (KFR-02N-120-C1-23, Kyowa, Japan) were mounted longitudinally on the 5.5mm Standard abutment (Nobel Biocare, Sweden) and three kinds of gold cylinders such as, as-received gold cylinder, gold cylinder after casting, and plastic cylinder after casting with type IV gold alloy were connected over the top of the standard abutment. Two kinds of tightening methods, such as manual torque with handhold screwdriver and electronic torque using Electronic torque controller were used to generate preload on the abutment. The result were as follows; 1. The preload generated by tightening cast plastic cylinder with handhold screw driver, was the lowest among the six groups. 2. The preload generated by cast plastic cylinder was lower than those by gold cylinders regardless of the tightening methods. 3. The electronic torque controller produced higher torque values than the handheld screwdriver.

스트레인 게이지를 이용한 임플랜트 지지 오버덴춰의 응력분석

조혜원,권주홍,이화영,Cho, Hye-Won,Kwon, Joo-Hong,Lee, Wha-Young 대한치과보철학회 1999 대한치과보철학회지 Vol.37 No.1

Stress distribution on mandibular implants supporting overdentures were registered in vitro experimental model by means of 4 rosette gauges which were placed around the implant. The overdenture attachments used in this study were the Resilient Dolder bar, Rigid Bolder bar, Round bar, Hader bar & Dal-Ro attachment. An occlusal jig was placed on the overdenture and the loading sites were 3 points which mimicked working, balancing, and median relations. With 5 and 10kg loading, strains were measured by strain indicator(P-3500, Measurement group, Raleigh, USA), and using these data, maximum and minimum principal stresses and Von Mises stress were calculated and evaluated. The results were as follows : There was a tendency of high stress concentration in the lingual side of the implant, and in the buccal side low stress was developed regardless of the attachment systems. The resilient Bolder bar concentrated highest stress among the attachment systems, and the Round bar and the Dal-Ro attachment provided comparatively low stresses around the implant. The rigid Bolder bar concentrated high stress in the mesial side, and the Dal-Ro attachment developed tensile stress patterns in the lingual and distal sides of the implant at the balancing relation.

원인불명의 한열왕래(寒熱往來)를 주소로 내원한 소양상풍증(少陽傷風證) 치험(治驗) 1례

조혜원,허한솔,이재욱,임은철,강주영,Cho, Hye-Won,Hur, Han-Sol,Lee, Jae-Wook,Lim, Eun-Chul,Kang, Ju-Young 사상체질의학회 2016 사상체질의학회지 Vol.28 No.4

Objectives We report a case which is based on Sasang constitutional Medicine for Soyangsangpungjeung of Soyangin who has chill and fever. Methods We have treated a Soyangin patient that had chill and fever which was diagnosed as Soyangsangpungjeung. We prescribed oriental medicine therapy focused on herbal medicine for that physical symptoms. The improvement of that symptoms was evaluated. Results After using oriental medicine therapy, patient's physical symptoms were improved. Conclusions This case study showed an efficient result of using oriental medicine therapy, especially herbal medicine in Soyangsangpungjeung of Soyangin.

하악 구치부에서 임플랜트 배열방식에 따른 임플랜트지지 고정성 국소의치의 광탄성 응력 분석

조혜원,김난영,김유리,Cho Hye-Won,Kim Nan-Young,Kim Yu-Lee 대한치과보철학회 2005 대한치과보철학회지 Vol.43 No.1

Statement of problem. More than 70% of patients who need the implant supported restoration are parially edentulous. The principles of design for implant supported fixed partial denture in mandibular posterior region are many and varied. Jurisdiction for their use is usually based on clinical evaluation. There are several areas or interest regarding the design of implant supported fixed partial denture in mandibular posterior region. 1) Straight and tripod configuration in implant placement, 2) Two restoration types such as individualized and splinted restorations. Purpose. The purpose of this study was to compare the amount and distribution of stress around the implant fixtures placed in the mandibular posterior region with two different arrangements and to evaluate the effects of splinting using the photoelastic stress analysis. Material & methods. 1) Production of study model: Mandibular partially edentulous model was waxed-up and duplicated with silicone and two models were poured in stone. 2) Fixture installation and photoelastic model construction: Using surveyor(Ney, USh), 3 fixtures(two 4.0 $\times$13 mm, one 5.0$\times$10 mm, Lifecore, USA) were insta)led in straight & tripod configurations. Silicone molds were made and poured in photoelastic resin (PL-2. Measurements group, USA). 3) Prostheses construction: Four 3-unit bridges (Type III gold alloy, Dongmyung co., Korea) were produced with nonhexed and hexed UCLA abutments and fitted with conventional methods. The abutments were tightened with 30 Ncm torque and the static loads were applied at 12 points of the occlusal surface. 4) Photoelastic stress analysis : The polarizer analyzer system with digital camera(S-2 Pro, Fujifilm, Japan) was used to take the photoelastic fringes and analysed using computer analysis program. Results. Solitary hexed UCLA restoration developed different stress patterns between two implant arrangement configurations, but there were no stress transfer to adjacent implants from the loaded implant in both configurations. However splinted restorations showed lesser amount of stresses in the loaded implants and showed stress transfer to adjacent implants in both configurations. Solitary hexed UCLA restoration with tripod configuration developed higher stresses in anterior and middle implants under loading than implants with straight configurations. Splintied 3 unit fixed partial dentures with tripod configuration showed higher stress development in posterior implant under loading but there were no obvious differences between two configurations. Conclusions. The tripod configuration of implant arrangement didn't show any advantages over the straight configuration. Splinting of 3 unit bridges with nonhexed UCLA abutments showed less stress development around the fixtures. Solitary hexed UCLA restoration developed tilting of implant fixture under offset loads.

하악 임플란트지지 오버덴춰에서 바 어태치먼트의 유지력이 임플란트의 축력에 미치는 영향

조혜원,Cho, Hye-Won 대한치과보철학회 2000 대한치과보철학회지 Vol.38 No.1

Three linear strain gauges (KFR-02N-120-C1-23, Kyowa, Japan) were placed around the abutment of implant future and the maximum axial loads on the mandibular implants supporting over dentures were registered in experimental model when the overdenture was removed. The overdenture attachments used in this study were Round bar Hader bar, Dolder bar with and with out spacer. The retention of bar attachment was measured using universal testing machine while being con-trolled by Activating set and Deactivator except in case of the Hader bar. Simultaneously strains were recorded with the strain smart program in strain P-6000 series (Measurement group, Raleigh, USA). The maximum axial load was calculated and compared with each other. The results were as follows: 1. The amount and the timing of the maximum axial loads were different between the right and left implant in all attachment systems. 2. The retention of bar attachment except Hader bar could be adjusted but the controllability was different among the attachment systems. 3. The more the axial load, the higher the retention with Hader bar and Dolder bar without spacer. but the tendency of increase was not shown with round bar and Dolder bar with spacer.

인간태아 섬유아세포와 생쥐배아 섬유아세포를 기저세포로 활용한 인간 배아줄기세포의 확립

조혜원,고경래,김미경,이재익,신수일,이동형,김기형,이규섭,Cho, Hye Won,Ko, Kyoung Rae,Kim, Mi Kyoung,Lee, Jae Ik,Sin, Su Il,Lee, Dong Hyung,Kim, Ki Hyung,Lee, Kyu Sup 대한생식의학회 2005 Clinical and Experimental Reproductive Medicine Vol.32 No.2

Objectives: This study was carried out to establish human embryonic stem cells derived from frozen-thawed embryos using mouse embryonic fibroblasts (mEFs), human fetal skin and muscle fibroblasts as feeder cells, and to identify the characteristic of embryonic stem cells. Methods: When primary mEFs, human fetal skin and muscle fibroblasts were prepared, passaging on 4 days from replating could have effective trypsinization and clear feeder layers. Eight of 23 frozenthawed 4~8 cell stage embryos donated from consenting couples developed to blastocysts. Inner cell mass (ICM) was isolated by immunosurgery. ICM was co-cultured on mEFs, human fetal skin or muscle fibroblasts. The ICM colonies grown on mEFs, human fetal skin or muscle fibroblasts were tested the expression of stage specific embryonic antigen-3, -4 (SSEA-3, -4), octamer binding transcription factor-4 mRNA (Oct-4) and alkaline phosphatase surface marker. Results: We obtained 1 ICM colony from 2 ICM co-cultured on mEFs as feeder cells and did not obtain any ICM colony from 6 ICM clumps co-cultured on human fetal skin or muscle fibroblasts. The colony formed on mEFs could be passaged 30 times every 5 days with sustaining undifferentiated colony appearance. When the colonies cultured on mEFs were grown on human fetal skin or muscle fibroblasts, the colonies could be passaged 15 times every 9 days with sustaining undifferentiated colony appearance. The colonies grown on mEFs and human fetal fibroblasts expressed SSEA-4 and alkaline phosphatase surface markers and positive for the expression of Oct-4 by reverse transcription-polymerase chain reaction (RT-PCR). The produced embryoid body differentiated spontaneously to neural progenitorlike cells, neuron-like cells and beating cardiomyocyte-like cells, and frozen-thawed embryonic stem cells displayed normal 46,XX karyotype. Conclusions: The human embryonic stem cells can be established by using mEFs and human fetal fibroblasts produced in laboratory as feeder cells.