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굴패각과 인산으로부터 수산화아파타이트 분말 합성에 관한 연구
류수착,엄지영,Ryu, Su-Chark,Eom, Ji-Young 한국재료학회 2002 한국재료학회지 Vol.12 No.9
Hydroxyapatite powders were prepared after heating at $1250^{\circ}C$ by the direct reaction using oyster shells and $H_3$$PO_4$. Properties of hydroxyapatite powders were investigated as XRF, XRD, DTA, FT-IR, SEM. Only hydroxyapatite was observed in XRD powders which was heated at $1250^{\circ}C$ for 2 hours and there was no remained CaO in that sample. And the results of FT-IR of sample was confirmed hydroxyapatite. Sample was agglomerated together, but needle shape morphology was observed in powders heated at $1250^{\circ}C$.
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Hydroxyapatite 소결체의 가소제 첨가에 따른 특성
류수착,김재규,김승현,Ryu, Su Chark,Kim, Jae Kyu,Kim, Seung Hyeon 한국결정성장학회 2019 한국결정성장학회지 Vol.29 No.4
HAp의 성형성과 열처리를 용이하게 하는 유기가소제를 사용하여 첨가량에 따른 강도(MPa)와 경도(Hv), 수축율(%) 및 생물학적 특성 중 항균력을 측정하였다. 가소제의 첨가량이 증가할수록 기계적 특성인 압축강도와 굽힘강도, 경도 등이 증가하였으나 가소제의 첨가량이 7%를 넘을 경우 오히려 기계적 특성이 감소하였다. 이는 허용치 이상의 가소제의 첨가는 성형 시 균열을 발생시키고 이러한 균열은 소결 시 내부에 미세균열 및 산화 시 기공의 발생을 촉진시켜 기계적 특성의 감소를 유발한다. 항균성 측정 결과 가소제 첨가량 에 관계없이 균은 검출되지 않았으며 우수한 항균력을 발휘하였다. The strength (MPa), hardness (Hv), shrinkage (%) and biological properties of the HAp were measured by using an organic plasticizer which facilitates the molding and heat treatment. Mechanical properties such as compressive strength, bending strength and hardness were increased with increasing amount of plasticizer, but mechanical properties were decreased when plasticizer was added more than 7 %. This is because addition of the plasticizer above the allowable value causes cracking during molding, and such cracks promote the generation of microcracks and pores at the time of sintering, resulting in a decrease in mechanical properties. As a result of the antimicrobial activity test, no bacteria were detected regardless of the addition amount of plasticizer.
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Early results of bidirectional cone sutures for mid-face lifting in Asian patients
Phoebe Kar Wai Lam,James Yui Lam,Edwin Kwan Chark Lau,Wang Lung Luk 대한미용의학회 2020 대한미용의학회지 Vol.4 No.1
Background: There are intrinsic difference facial aesthetics between Asian and Caucasian, as well as racial differences in beauty standards. Bi-directional cones threads are effective in mid-face lifting but there was yet no study in Asians. Objective: This study aimed to determine the effects on mid-face laxity the effect size of using bidirectional cone suture for facelifting in Asian patients. Methods: In this prospective study, three pairs of bidirectional cone threads were used for mid-face lifting in 10 healthy volunteers with mild-to-moderate facial laxity. Results: The validated assessment parameters used in the study were the facial laxity rating scale (FLRS) to evaluate the severity of mid-face laxity and the wrinkle severity rating scale (WSRS) to assess the severity of the nasolabial fold (NLF). Overall, there was a substantial improvement in mid-face laxity and the NLF after thread lifting, supported by treatment effect size (Kendall W’s value: 0.96 and 0.85, respectively). Significant improvements for both mid-face laxity and NLF were observed in all patients by 3 months (p<0.05), with significant differences in FLRS (p=0.000) and WSRS (p=0.001). At each follow-up, all patients would complete a selfadministered questionnaire that included the subjective satisfaction rating scale. The results showed that patient satisfaction was substantially improved; the differences between baseline and the 6-week and 3-month follow-up were significant (p<0.05), and the treatment effect size was W=0.950 (p<0.05). All subjects tolerated the procedure well with transient and minimal side effects. Conclusion: In Asians with mild-to-moderate laxity, absorbable cones sutures produced considerable improvement in mid-face laxity and NLF within three months. The findings were consistent among the three reviewers and were statistically significant (p<0.05). Patient satisfaction was higher at the 6-week and 3-month follow-up compared to the baseline (p<0.05).
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Lam Phoebe Kar Wai,Fung Chi Pun,Lam James Yui,Luk Wang Lung,Lee Alvin Ka Wai,Lee Cheuk Hung,Tam Paul Man Kei,Lau Edwin Kwan Chark 대한미용의학회 2022 대한미용의학회지 Vol.6 No.1
Background: There was evidence of improvement in mid-face laxity using three pairs of suspension sutures in mid-face lifting in our early and mid-term follow-up. Objective: This 24-month prospective follow-up study aimed to determine the efficacy of mid-face lifting and lower jawline contouring using poly lactic-co-glycolic acid (PLGA) sutures in Asian patients. Methods: Ten healthy volunteers received three pairs of 8-cones bidirectional cones sutures at the mid-face. One of the ten volunteers lost to follow-up, and all remaining patients followed up for 24 months. Our primary outcome measure is the change in the facial laxity rating scale (FLRS), an “improvement” defined as at least “one-grade change” in FLRS. Other assessment parameters include the severity of the nasolabial fold (NLF), assessed on the wrinkle severity rating scale (WSRS). The secondary outcome measures were the self-satisfaction rating scale (SSRS) and global aesthetic improvement scale (GAIS), rated by participants at each follow-up interval. Results: A linear improvement in the mid-face was observed almost immediately after treatment, with progressive improvement up to at least 12 months following the intervention and no deterioration by 24 months. This improvement was significant (p<0.05), and the differences between before and after treatment at each follow-up interval were large (Cohen’s d>0.8). Contour improvement for the lower face followed a similar trend, except for a delay in the observable differences at three months (Cohen’s d=0.29, 0.8 at six weeks and three months, respectively). The differences in the level of patient satisfaction were significant (p<0.05) from 6 weeks to 24 months, peaking between 12 and 18 months, based on both the GAIS and SSRS ratings. No observed complications. Conclusion: Mid-facing lifting in Asian patients with mild-to-moderate laxity is safe and effective with PLGA bidirectional cone sutures, with concurrent improvement in the lower face contour and elevated patient satisfaction over the 24-month follow-up period.
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고압나트륨등 조사가 파프리카의 생장 및 수확량에 미치는 영향
장경만 ( Kyung-man Jang ),김세광 ( Segwang Kim ),신민경 ( Min Kyung Shin ),박규현 ( Gyu Hyeon Park ),신영자 ( Young Ja Shin ),박창록 ( Chark Lok Park ),오송림 ( Song Lim Oh ),이정현 ( Jeong Hyun Lee ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.1
연구의 목적은 낮은 외부 광조건과 겨울철 일조시간을 연장시켜 파프리카의 생육 및 수확량에 미치는 영향을 구명하고자 수행하였다. 광원은 고압나트륨등(High pressure sodium lamps, 400W)을 이용하여 광량자속밀도 umol/ ㎡/s로 조사하였다. 전남대학교 벤로형 유리온실 1개 구역(4.8*5m)에서 파프리카 공시품종‘Scirocco’(Enza Zaden, The Netherlands)를 2018년 9월 12일 240구 암면 두 트레이에 표준양액(EC 2.5dSㆍm<sup>-1</sup>)으로 포습하여 파종하였고 본 엽이 2~3매 전개되었을 때 유묘를 표준양액(EC 3.0dSㆍm<sup>-1</sup>)으로 포습 된 코코피트배지 (100×20×15cm, Daeyoung GS, Korea)에 2018년 10월 1일에 정식하였다. 줄기밀도는 7.5stems/ ㎡로 재배하였다. HPS 처리는 정식 후 17일부터 시작하였으며 1:30~17:30까지 하루 16시간동안 외부광도가 200W/ ㎡ 이하일 때 조사하였고, 파프리카의 동적생육정보와 수확량을 조사하기 위해 주기적으로 조사 하여 대조구(무처리구)와 비교 분석 하였다. 엽 건물중은 대조구와 유의적 차이를 보이지 않았으나 줄기, 생식기관, 총건물중에서 대조구에 비해 HPS 처리구에서 각각 34%, 89%, 47%가 증가하는 유의성을 나타냈다. 초기 수확소요일은 HPS 처리구에서 20일 정도 빨랐고 단위 면적당 누적수확량은 정식 후 148일에 유의적 차이를 보였으며 HPS 처리구에서 2.992±0.528 kg/ ㎡ 대조구에서 0.785±0.168 kg/ ㎡, 177일에는 유의적 차이는 없었으나 HPS 처리구에서 4.663±1.144 kg/ ㎡ 대조구에서 3.469±0.962kg/ ㎡로 HPS처리구가 대조구에 비해 높은 수치를 보였다. HPS 처리구는 초기 수확 소요일을 앞당겼으며 초기 생육과 건물생산의 증가에 영향을 미쳤다.
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