복합레진 적층계면에서 oxygen inhibition의 영향에 관한 연구

최수미,박재홍,최성철,김광철,최영철 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.3

The purpose of this study was to assess the effect on oxygen inhibition layer(OIL) for the interfacial bonding between resin composite layers, including shear bond strength, fracture modes and degree of conversion. The first layer of specimen was filled with Z-250(shade A3) and was cured for 40s. The second layer of specimen was filled with same composite(shade A1) and was cured for 40s. The first layer of specimens for each group were prepared by methods as followings. Control(curing in atmospheric air), Group1(curing against Mylar strip), Group2(scrubbed with a acetonesoaked cotton), Group3(using Tescera light cup), Group4(using Tescera heat cup), Group5(stored in disti1led water for 30days at 37℃), Group6 (using bonding agent). The results were as follows: 1. There was no statistically significant different shear bond strength between control and group 1(p>0.05). 2. Group 2 showed significantly lower shear bond strength than control and group 1(p<0.05). 3. The observation of the fracture surface leads to the evidence that a major difference occurs in the case of control, group1 and group 3 samples which break mainly cohesively while the other groups break in majority adhesively. 4. The results of FTIR showed that the degree of conversion was the highest in group 2 and the lowest in control group(p<0.05). It can be concluded that an OIL is not necessary for bonding with composite resin. But if a reduced critical amount of the unreacted monomer is present, it was detrimental to bonding additional layers of composite. Further study, such as the quantitative analysis of the unreacted monomer are required. 복합레진의 적층계면에서 산소억제층(oxygen inhibition layer:이하 OIL)의 영향을 연구하기 위해, 아크릴릭 몰드(하층)에 복합레진의 shade A3를 충전한 후 표면의 조건을 달리하여 중합하였으며 상층은 shade A1으로 충전하고 중합하였다. 대조군(OIL 존재), 1군(OIL 형성억제), 2군(OIL 형성억제+레진표면의 미반응 모노머 제거), 3군(가압하에 중합), 4군(열중합), 5군(시효처리), 6군(시효처리+본딩제 도포)로 하층의 계면조건을 다르게 하였다. 전단결합강도와 파절양상, 전환률을 분석하여 다음의 결과를 얻었다. 1. 전단결합강도 측정 결과 대조군과 제 1군 사이에 통계학적으로 유의한 차이가 없었다(p>0.05). 2. 제 2군은 대조군과 1군에 비해 낮은 결합강도를 보였다(p<0.05). 3. 제 3군은 가장 높은 결합강도를 보인 반면, 4군은 가장 낮은 결합강도를 보였다. 4. 6군은 5군보다 두 배 정도 높은 결합강도를 보였다. 5. 대조군과 1군 및 3군에서는 주로 응집성 복합레진파절이 일어난 반면 2군, 4군, 5군과 6군에서는 주로 접착성 계면파절이 일어났다. 6. FTIR로 전환률을 측정한 결과 2군에서는 50.55%로 가장 높았고, 대조군에서는 가장 낮았다(p<0.05). 전단결합강도와 전환률의 결과로 보아, OIL은 복합레진 계면의 결합에 필수적인 요인은 아니며, 표층의 미반응 모노머가 결합강도에 영향을 미치는 것으로 보인다. 향후 계면 결합강도에 영향을 미칠 수 있는 미반응 모노머의 정량적인 분석을 통한 추가적인 연구가 필요할 것으로 생각된다.

僧帽辨狹窄의 外科的 療法

崔永壽,朴炳元,鄭檜敎,金在珪,李喜晟 육군의무장교단 1960 육군의무장교단잡지 Vol.7 No.1

산부식 시간에 따른 유전치 법랑질의 부식 유형에 관한 연구

최수미,최영철,박재홍,최성철 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.3

이 연구의 목적은 유전치 법랑질에서 무소주 법랑질 층이 있는 치경부에서의 적절한 산부식 시간을 알아보고자 함이다. 경희대학교 치과대학병원 소아치과에 내원한 환아에게서 발거한 치아 순면에 우식이 없는 건전한 치아 32개를 대상으로 실험 하였다. 발거된 유전치의 치경부 법랑질을 35% 인산으로 실험 1군은 15초,실험 2군은 30초,실험 3군은 45초,실험 4군은 60초간 산부식한 후 부식시간에 따른 법랑질 표면의 양상을 SEM으로 관찰하여 평가하였다. 1. 실험 1군에서는 Type 3가 75% 나타났으며 실험 2군과 3군 모두에서 Type 1이 38%, Type 2가 50%로 나타났다. 2. 실험 2군보다 실험 3군에서 산부식된 양상이 좀더 뚜렷하게 나타났다. 3. 실험 4군에서 Type 1이 25%. Type 2가 75%를 보였고 Type 3는 나타나지 않았다. 4. 실험 4군에서는 다른 실험군에서 보다 좀더 전형적인 산부식 양상을 보였다. 5. 설험군 간의 산부식 시간에 따른 부식 양상의 차이는 통계학적으로 유의한 차이를 보였다(p<0.05). 6. 산부식 시간이 길수록 부착에 유리한 Type 1과 Type 2가 주로 관찰되었으며 Type 3는 드물게 관찰되었다(p<0.05). 유전치에서 무소주 법랑질 층이 주로 존재하는 치경부 측에,와동의 변연부가 형성될 때에는 산부식 시간을 다소 길게 45∼60초 정도 하는 것이 수복물 유지를 향상시킬 것으로 여겨진다. The presence of a"prismless" layer on the enamel surface particularly on deciduous teeth has been reported by a number of workers. This structure, which appears to lack the normal prism delineations, could interfere with tag formation and hence, reduce bonding to such surfaces. The purpose of this study was to investigate the relationship of etching times on the effect of acid etching on primary enamel with respect to the quality of etching patterns. Labial surfaces of 32 extracted or exfoliated caries-free primary anterior teeth were used. 35% phosphoric acid gel was used only cervical regions of labial surfaces for each etching time group, 15, 30, 45 and 60 seconds. The surfaces were then washed with water for 20 seconds and dried with air spray for 20 seconds. 1. The Type 3 is 75% when the 15 seconds acid etching time was used. 2. The Type 1 is 38% and Type 2 is 75% when the 30 and 45 seconds acid etching time was used. 3. The Type 1 is 25% and Type 2 is 75% when the 60 seconds acid etching time was used. 4. An etching time of 60 seconds produced a constant and regular etching pattern. 5. There is a significant difference between the groups with respect to the patterns of etch achieved(p<0.05). 6. We confirmed that the acid induced patterns(type 1, 2) became more pronounced when the application time increased(p<0.05). 45∼60 seconds was the optimal time for etching on the primary enamel.

A Novel Fluid-Reconfigurable Advanced and Delayed Phase Line Using Inkjet-Printed Microfluidic Composite Right/Left-Handed Transmission Line

Sungjin Choi,Wenjing Su,Tentzeris, Manos M.,Sungjoon Lim IEEE 2015 IEEE microwave and wireless components letters Vol.25 No.2

<P>In this letter, a novel fluid-reconfigurable advanced and delayed phase line using a microfluidic composite right/left-handed (CRLH) transmission line (TL) is proposed. A CRLH-TL prototype is inkjet-printed on a photo-paper substrate. In addition, a laser-etched microfluidic channel in poly(methyl methacrylate) (PMMA) is integrated with the CRLH TL using inkjet-printed SU-8 as a bonding material. The proposed TL provides excellent phase-tuning capability that is dependent on the fluidic materials used. As the fluid is changed, the proposed TL can have negative-, zero-, and positive-phase characteristics at 900 MHz for different fluids. The performance of the TL is successfully validated using simulation and measurement results.</P>

심리적 안전이 창의성에 미치는 영향: 성장마인드셋과 조직지원인식의 매개효과를 중심으로

최우수(Choi, Woo-Su),오상진(Oh, Sang-Jin) 한국경영교육학회 2020 경영교육연구 Vol.35 No.5

[연구목적] 본 연구는 불확실한 경영 환경 속 기업에게 혁신 수단으로서 창의성을 제시하기위해, 심리적 안전이 창의성에 미치는 영향과 그 과정에서 성장마인드셋, 조직지원인식과의 관계를 실증하여, 창의성 제고를 위한 실용적 방안을 제시하고자 한다. [연구방법] 국내 기업에 근무하는 다양한 업종의 구성원 총 420명에게 설문지를 배부하여 353명에게 자료를 수집하였다. 심리적 안전, 창의성, 성장마인드셋, 조직지원인식과 관련된 이론 및 선행 연구를 토대로 가설을 설정하였으며, 통계 도구로는 CFA를 통해 신뢰도와 타당성을 검증하였고, 가설검증을 위해 SPSS25, AMOS25, Macro Process3.0을 사용하였다. [연구결과] 연구 모형에 대한 가설 검증 결과 심리적 안전은 성장마인드셋, 조직지원인식, 창의성에 유의한 정(+)의 영향을 주는 것으로 나타났으며, 성장마인드셋과 조직지원인식의 매개효과도 유의한 것으로 나타났다. [연구의 시사점] 본 연구는 기업 현장의 조직문화 요인과 창의성 간의 관계를 동기부여 이론으로 검증했다는데 의의가 크다. 특히, 창의성을 특별한 재능 소유자의 전유물이 아니라 조직 문화의 변화를 통해 구성원들에게 확산시킬 수 있는 혁신의 도구로 제안했다는 점에서 시사점이 있다. [Purpose] This study aims to present creativity as a means of innovation to companies in uncertain business environment, demonstrate the impact of psychological safety on creativity and its relationship with growth mind-set and perceived organizational support in the process, and suggest practical measures to enhance creativity. [Methodology] Data were collected from 353 members. Hypothesis was set based on theories and previous studies related to psychological safety, perceived organizational support, growth mind-set and creativity. The collected data were reviewed for reliability and validity through CFA, and hypothesis verification was performed using SPSS 25, AMOS 25, and Macro Process 3.0 by Bootstrap. [Findings] Psychological safety was found to have a significant positive effect on growth mind-set, perceived organizational support and creativity, and the mediating effects of growth mind-set, perceived organizational support were also significant. [Implications] This study is significant in that it has verified the relationship between organizational culture factors and creativity at corporate sites with the theory of motivation. In particular, creativity is not the exclusive property of a particular talent owner, but it has implications for spreading to members through changes in organizational culture and, through this, proposed as a tool for innovation.

배드민턴 드롭샷 동작의 운동학적 분석

오정환,최수남,정익수 한국운동역학회 2005 한국운동역학회지 Vol.15 No.1

C. H. OH, S. N. CHOI, I. S. JEONG. Kinematic Analysis of the Badminton Drop-shot Motion. Korean Journal of Sport Biomechartics, Vol. 15, No. 1, pp. 221-235, 2005. The purpose of this study was to analyse badminton players' drop-shots, in order to make players understand the principles of drop-shot motion in badminton. Three dimensional analysis was used to measure movements such as the time required per section, the change of center of gravity, joint angle and speed, and joint speed. The results of this study revealed as follows: (1) top players are faster than amateurs in the total time required per section; (2) top players moved more in the x-axis and z-axis, while amateurs moved more in the y-axis; (3) the inclination of amateurs was greater than that of top players in all phases; (4) amateurs showed larger angle on the shoulder joints than top players in the first phase, while top players showed larger angle on the shoulder joint than amateurs in the second and third phase. Amateurs' angle was larger on angle joint in the first phase than top players' ones, while top players' angle was larger in the third phase than amateurs; (5) the speed of racket head of top players was faster than that of amateurs; and the velocity of the center of gravity of amateurs was greater than that of the top players. The findings of this study were that gravity decreases during impact and then the velocity increases to perform the follow-through and making the swing fast by increasing the speed of the racket head is most important.

대구, 경북지역 대학생의 식사행동 및 일본음식에 대한 인상 및 기호도 조사 연구

한재숙,이연정,최석현,최수근,권상용,최영희 동아시아식생활학회 2004 동아시아식생활학회지 Vol.14 No.1

본 연구는 대구, 경북지역의 대학생(570명)을 대상으로 식사내용, 식사관습, 식사예절, 일본음식에 대한 인상과 시식경험 및 기호도를 조사한 것으로 그 분석결과를 요약하면 다음과 같다. 1. 음식은 항상 일인분씩 담는다’의 경우는 전체응답자의 15.5%에 불과하였고, ‘음식을 큰 접시에 모아서 담는다’의 경우는 ‘가끔 한다’가 44.8%, ‘항상 한다’가 35.8%로 나타나 큰 접시에 모아서 담는 가정이 많았다. ‘저녁은 가끔 가족이 함께 모여서 먹는다’가 59.9%로 가장 많았고, ‘항상 가족이 모여 같은 음식을 먹는다’는 끼니는 아침이 42.3%, 저녁이 23.3%, 점심이 3%로 나타나 아침에 가족이 모여 같은 음식을 먹는 경우가 가장 많았다. 2. ‘식사시 가족의 자리가 정해져 있다’고 한 경우는 전체응답자의 53.5%였고, ‘가족이 모여 식사할 경우, 연장자가 수저를 들기 전에는 먹지 않는다’는 전체의 56.4%였으며, ‘가장에게는 음식의 양이나 수가 많다’는 30.9%였다. 3. 식사예절에 대해 가장 자주 주의를 받는 것은 ‘TV를 보지 않고 먹기’(13.4%), 남기지 않고 먹기(11.5%), ‘수저사용법’(8.0%)의 순으로 나타났다. 반면 ‘식기 부딪히는 소리’(76.9%), ‘입 다물고 먹기’(76.6%), ‘씹는 소리’(74.6%), ‘밥 먹는 모양’(71.4%), ‘수저 사용법’(69.7%)등은 전체응답자의 70% 이상이 ‘주의를 받지 않는다’고 하였다. 4. 음식 만들기에 대한 선호도는 5점 만점에 3.48점으로‘보통 이상’으로 나타났고 국가별 요리에 대한 기호도는 한국요리(4.39점)가 가장 높았고, 그 다음이 중국요리 (3.76점), 이태리요리(3.45점), 일본요리(3.32점) 순이었으며 프랑스요리(3.16점)가 가장 낮은 기호도를 보였다. 음식 만드는 빈도는 한달에 1∼2회 정도로 나타나 대학 생들이 직접 음식을 만드는 빈도는 매우 낮음을 알 수 있었다. 5. 일본 방문경험은 조사대상자의 93.8%가 없었으며, 그중 92.6%가 일본방문을 희망하였고 일본음식에 대한 이미지는 ‘가격이 비싸다’(4.15점), ‘장식이 아름답다’(4.05점), ‘색채가 예쁘다’(3.98점) 등은 높은 점수를 보인 반면에 ‘맵다’(2.21점), ‘기름기가 많다'(2.51점), ’깊은 맛이 있다‘(2.56점) 등은 낮은 점수를 보였다. 6. 일본음식 중 가장 높은 시식경험을 가진 것은 우동(95.3%)이었고 그 다음은 스시(93.1%), 덴뿌라(81.9%)순 이었고, 반면에 니쿠자가(6.4%), 오차즈께(9.3%), 오코 노미야끼(11.1%), 다코야끼(16.0%) 등은 매우 낮은 시식경험을 보였다. 7. 일본음식에 대한 기호도는 우동(3.98점), 스시(3.85점), 덴뿌라(3.69점), 소바(3.43점), 스키야끼(3.12점)는 대체로 높은 기호도를 나타낸 반면 낫또(2.68점), 오차즈께(2.76점), 오코노미야끼(2.87점), 미소시루(2.88점), 다코 야끼(2.88점) 등은 낮은 기호도를 보였다. 이상의 연구결과로 변모해 가는 우리전통 식사예절의 동향 파악이 가능하였고 가족간의 화목과 건강한 사회를 이루기 위한 가족 단란의 식사지침이 요구되었다. 한편 일본음식중에는 우동과 스시가 한국대학생들에게 가장 인기가 높은 음식임을 알 수 있었고 대부분의 일본요리에 대해 장식이 예쁘고 색채가 아름답지만 값이 비싸다는 이미지를 가지고 있어서 가격을 좀 더 낮춘다면 그 이용이 더욱 늘어날 것으로 기대되었다. 또한 낫또, 오차즈께, 오코노미야끼 등 이용도가 낮은 음식에 대해서는 한국인의 입맛에 맞는 요리법을 가미한다면 대중화가 가능하리라고 여겨진다. This study was conducted to investigate the dietary behavior and image and preference of Japanese foods. The Subjects were consisted of 570 university students(243 males and 327 females) in Daegu and Kyungbuk area, Korea. The students responses to the 10 questions about image of Japanese foods were also measured on 5 point Likert scale. Data were presented by using frequency, percentage, chi-square test and T-test. The results of this study were as follows: (1) On the eating habits, 'the whole family has breakfast together with same foods everyday' scored high as 42.3% and 'foods put in a big platter by gathering everyday' as 35.8%. (2) About the eating customs, 53.5% of the subjects responded that the seat was fixed at meal time, 56.4% didn't start to eat before the patriarch started a meal and 30.9% responded that the head of a family had more foods in number and quantity. (3) On the table manners, 13.4% of the subjects were scolded about 'watching TV on eating', 11.5% about 'making left-over foods', 8.0% about 'misuse of spoon and chopsticks'. (4) The preferred ethnic foods by University students was in other of Korean, Chinese, Italian, Japanese and French foods. (5) Among subjects, 93.8% had no experience of visiting Japan and 92.6% wanted to visit Japan. Images on the Japanese foods were 'the price is too expensive' (mean 4.15) and 'the decoration is wonderful'(mean 4.05). But the subjects did not think Japanese foods as 'hot'(mean 2.21) and 'greasy'(mean 2.51). (6) The favorite Japanese food of subjects was Udon(mean 3.98), Sushi(mean 3.85) and Tempura(mean 3.69). So Udon turned out to be the most popular Japanese foods by university students in Daegu and Kyungbuk area, Korea. But they did not prefer Natto(mean 2.68), Ochazuke(mean 2.76), Okonomiyaki(mean 2.87) and Misosirn and did not eat. From the above results, Korean university students preferred Udon to Natto among Japanese traditional foods, and they estimated Japanese foods as 'too expensive'. Therefore, lowering the price and developing the cooking method for Korean taste were needed to increase the intake of Japanese traditional foods by Korean university students and.

국내 혈액질환 환자에서 침습성 아스페르길루스증의 구제치료로서 Voriconazole의 효과와 안전성

권재철,김시현,최수미,최재기,이동건,박선희,최정현,유진홍,신완식 대한감염학회 2010 감염과 화학요법 Vol.42 No.1

Background: Invasive aspergillosis (IA) is associated with significant morbidity and mortality in patients with hematologic malignancies. We investigated the efficacy and safety of voriconazole (VCZ) when used as salvage therapy for IA in Korean adults with hematologic malignancies who had not responded to prior antifungal therapy. Materials and Methods: We retrospectively reviewed data, collected from January 2007 to October 2008, from patients with proven or probable cases of IA. All were probable IA cases, except for one proven case. All cases were refractory or intolerant to antifungal therapy prior to administration of VCZ. Efficacy and safety were assessed in patients treated with VCZ for more than 3 days and for more than one dose, respectively. A favorable response [complete (CR) or partial (PR)] was defined by significant improvement of all clinical symptoms, signs, and radiologic abnormalities. Results: Fifty patients who met the inclusion criteria were enrolled. There were 27 male and 23 female patients with mean age of 44.4 years (range, 15-65 years). Underlying diseases were acute leukemia (35 cases), chronic myelogenous leukemia (4 cases), myelodysplastic syndrome (3 cases), lymphoma (3 cases) and other hematologic diseases (5 cases). Twenty-two patients had received chemotherapy and 13 patients had undergone hematopoietic stem cell transplantation. The lung was the main infection site (94%) followed by the sinus (6%). Amphotericin B deoxycholate alone was the most frequent previous antifungal therapy. The mean duration of antifungal therapy prior to VCZ therapy was 13.9±8.8 days (2-44 days). The median duration of VCZ therapy was 19 days (interquartile range, 49 days). Sixteen patients (32.0%) showed favorable responses (CR:PR=8:8) at the end of VCZ therapy. The numbers of patients with stable disease, progression and death were, 6 (12%), 6 (12%) and 22 (44%) respectively. Most of those with unfavorable responses had relapsed underlying malignancies or refractory graft versus host diseases. Twelve patients developed drug-related adverse events but only one patient stopped VCZ treatment prematurely. Conclusions: VCZ demonstrated an acceptable level of toxicity in patients with hematologic malignancies but further studies are required to prove its efficacy as salvage therapy.

Slide Session : OS-IFD-07 ; Infectious Disease : In Vitro Antiviral Activity of Ribavirin Against Severe Fever with Thrombocytopenia Syndrome Virus

( Myung Jin Lee ),( Kye Hyung Kim ),( Jong Youn Yi ),( Su Jin Choi ),( Chung Jong Kim ),( Nak Hyun Kim ),( Kyoung Ho Song ),( Pyoeng Gyun Choi ),( Ji Hwan Bang ),( Wan Beom Park ),( Eu Suk Kim ),( San 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

In Vitro Antiviral Activity of Ribavirin Against Severe Fever with Thrombocytopenia Syndrome Virus Myung Jin LEE1, Kye-Hyung KIM1, Jongyoun YI2, SuJin CHOI1, Chung-Jong KIM1, Nak- Hyun KIM1, Kyoung-Ho SONG1, Pyoeng Gyun CHOI1, Ji-Hwan BANG1, Wan Beom PARK1, Eu Suk KIM1, Sang-Won PARK1, Hong Bin KIM1, Nam Joong KIM1, Myoung- Don OH1 Seoul National University College of Medicine, Korea1, Pusan National University School of Medicine, Korea2 Background: Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious disease caused by a novel Bunyavirus, severe fever with thrombocytopenia syndrome virus (SFTSV). No effective antiviral therapy is proven yet, but clinical use of ribavirin (RBV) has been tried. We investigated the antiviral effect of RBV against SFTSV in vitro. Methods: To test for cytotoxicity of RBV, Vero cells were treated with different concentrations of RBV (3.90 to 500 μg/mL, two-fold dilution) and analyzed by cell viability MTS assay 48h post-infection. To determine antiviral activity of RBV against SFTSV, Vero cells were infected with SFTSV strain Gangwon/Korea/2012 at 100 TCID50 (50% tissue culture infective dose) per well in a 96-well plate, and RBV was added at the concentrations showing no or minimal cytotoxicity. Viral RNAs were extracted from the culture supernatants and quantifi ed using one-step real-time reverse transcription- PCR to amplify the partial large segment of SFTSV. Statistical analysis was done by one-way ANOVA with Tukey`s post hoc test. Results: Cytotoxicity due to RBV was not observed at RBV concentration =31.3 μg/ mL. Viral RNAs at 24h post-RBV treatment were reduced with increasing RBV concentrations (1-32 μg/mL), compared with those of mock-treated cells (P <0.01, Figure). Half maximal inhibitory concentration (IC50) of RBV was 3.69 μg/mL at 24h post-RBV treatment. Conclusions: Our study shows that RBV has antiviral effect against SFTSV in a dose-dependent manner. Further studies are required to evaluate the effi cacy of RBV in SFTS.

1990년대 후반 한국 전통 의상에 사용한 문양에 대한 고찰

崔景順,金壽景 服飾文化學會 1999 服飾文化硏究 Vol.7 No.5

This research was designed to study the different kinds of ancient patterns applied to the Korean traditional suit and the symbolism associated with these patterns being used the prevalent Han-bok collections in markets. The shapes and changes in the use of the patterns can be summarized as follows. The published collections in the last 5 years were specifically concentrated between 1996 and 1997, providing that the development in Han-bok designs was most active during that time. But the trend dereased due to the effects of a depressed domestic economy. The plant pattern was the most utilized pattern for practical purposes. It looks beautiful and it is also easily manufactured with open space. Symmetrical and linear arrangements make customers feel stable at sight and these patterns tend to attract public gaze resulting in increased sales. There is a problem whether to continue using the existing patterns of the Han-bok without any correction or whether to copy the pattern of the kimono or the western suit. Copying other patterns definitely hurts the elegance of the Han-bok. It is itme for us to not only keep our own traditions but also to study and develop new patterns that are distinct from the chinese and Japanese patterns. The following are suggested as the basic materials