전자재료 심포지엄 : SiO2 위에 저압화학기상증착법으로 증착한 Ge 박막의 증착 및 결정화 거동에 관한 연구

황석민,류명관,민석홍,김기범 ( Seok Min Hwang,Myung Kwan Ryu,Seok Hong Min,Ki Bum Kim ) 대한금속학회 1998 大韓金屬學會會報 Vol.11 No.5

자연산과 양식산 식용복어의 성분 비교

황석민 ( Seok Min Hwang ),오광수 ( Kwang Soo Oh ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.6

To identify the food component characteristics of seven edible pufferfishes (five wild pufferfishes including striped puffer Takifugu xanthopterus; eyespot puffer Takifugu chinensis; purple puffer Takifugu porphyreus; rough-backed puffer Lagocephalus wheeleri;and grass puffer Takifugu niphobles; and two cultured pufferfishes including yellow puffer Takifugu obscurus, and tiger puffer Takifugu rubripes) in Korea, the proximate, fatty/amino acid, chemical and taste compositions were investigated. The proximate compositions were not significantly different among the sampled pufferfishes, whereas grass puffer had lower moisture and crude lipid levels contents, and higher crude protein and ash contents than the other species. The total amino acid levels in wild and cultured pufferfishes were 14,941.6-16,427.9 mg/100 g, and the major amino acids were aspartic acid, glutamic acid, glycine, alanine,leucine, lysine and arginine. Regarding the fatty acid and mineral compositions, the major fatty acids included 22:6n-3, 16:0, 18:1n-9, 20:5n-3, 18:0, 20:4n-3, and 22:5n-3 in that order, and there was a little difference among the sampled pufferfishes. Grass puffer had a higher monoenes ratio, i.e., 16:1n-7 and 18:1n-9, and a lower polyenes ratio than the other pufferfishes. The main minerals detected K, P, Na, S and Ca. Regarding the taste-active compounds, the free amino acid contents of pufferfish extracts were 236.4-428.1 mg/100 g, consisting primarily of taurine, lysine, proline, glycine, alanine and arginine in that order. The amino nitrogen content of the pufferfishes was 84.5-156.4 mg/100 g, and there was a little difference among the species. As for taste intensity, the total taste value of the purple puffer was higher than that of the other pufferfishes.

단일 인덕터를 이용한 팩 투 셀 밸런싱 모드에서 커패시터를 이용한 밸런싱 속도 향상 방법

배석민(Seok-Min Bae),김예찬(Ye-Chan Kim),이소연(So-Yeon Lee),황인애(In-Ae Hwang),신지원(Ji-Won Shin),송승호(Seung-Ho Song) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7

개체동결 굴(Crassostrea gigas) 엑스분을 이용한 굴 풍미계 과립조미료의 제조 및 품질특성

황석민 ( Seok-min Hwang ),조준현 ( Jun-hyun Cho ),김상현 ( Sang-hyun Kim ),이인석 ( In-seok Lee ),오광수 ( Kwang-soo Oh ) 한국수산과학회(구 한국수산학회) 2016 한국수산과학회지 Vol.49 No.6

The pacific oyster Crassostrea gigas has a desirable taste and flavor that differs from those of other fish and shellfish. In order to develop a high value-added product from individually quick-frozen oyster extract (IQFOE), we prepared an oyster granular flavor seasoning (OGS) from IQFOE and characterized its qualities. The OGS was prepared by granular molding and fluidized bed drying with inosine monophosphate (IMP, 0.1%), yeast extract powder (1.4%), tangle extract powder (0.6%), monosodium glutamate (MSG, 5.0%), microcrystalline cellulose (0.6%), lactose (27.5%), salt (33.0%), spray-dried IQFOE (22.5%) as a powdered materials, and IQFOE (Brix 25°, 7.0%), soy sauce (0.4%) and water (1.7%) as a liquid materials. The moisture, crude protein, pH and salinity of the OGS were 3.4%, 12.5%, 6.50 and 32.0%, respectively. Especially, the OGS revealed very higher amino-N content (1,856.0 mg/100 g) than that (1,291.2-1,610.2 mg/100 g) of other commercial flavor seasonings. In taste-active compounds, free amino acid contents was 1,359.0 mg/100 g, and major ones were glutamic acid, taurine, hydroxyproline, glycine, lysine, phosphoserine, proline in order. And OGS showed good organoleptic qualities for taste, odor and general preference compared with commercial flavor seasonings on a local market.

소아 유연성 편평족에서 Kalix<SUP>®</SUP> 족근동 기구를 이용한 거골하 관절 제동술

황석민(Seok-Min Hwang),엄준상(Joon-Sang Eom),이동오(Dong-Oh Lee),이종수(Jong-Soo Lee),김성욱(Sung-Wook Kim),원태구(Tae-Gu Won),정홍근(Hong-Geun Jung) 대한정형외과학회 2017 대한정형외과학회지 Vol.52 No.6

목적: 소아의 유연성 편평족에 대한 거골하 관절 제동술의 방사선적 및 임상적 결과를 평가하고자 하였다. 대상 및 방법: 2007년 3월부터 2012년 6월까지 건국대학교병원에서 편평족으로 진단 후 거골하 관절 제동술을 시행받은 10명, 14예의 환자를 대상으로 하였다. 방사선적으로는 측면 방사선 사진을 통하여 거골-제1 중족골 간 각, 거골 수평면각 및 종골 경사각을 측정하였다. 전후면 방사선 사진을 통하여 거주상골 피복각 및 거골-제1 중족골 간 각을 측정하였고, 후족부 정렬 사진을 통하여 경골-종골각을 측정하였다. 임상적 평가로는 수술 전후의 visual analogue scale (VAS) 통증 지수와 미국 정형외과 족부족관절학회(American Orthopaedic Foot and Ankle Society, AOFAS) 기능 점수를 조사하였다. 결과: 평균 추시 기간은 48.7개월(16-98개월)이었으며, 평균 연령은 11.6세(6-19세)였다. 방사선적 측면 족부 방사선 사진상에서 거골-제1 중족골 간 각은 술 전 평균 -25.1도에서 술 후 평균 -7.5도, 거골 수평면각은 술 전 평균 37.4도에서 술 후 평균 23.2도 및 종골 경사각은 술 전 평균 8.3도에서 술 후 평균 15.0도로 각각 향상 측정되었다. 전후면 방사선 사진에서 측정한 거주상골 피복각은 술 전 평균 23.0도에서 술 후 평균 11.9도로, 거골-제1 중족골 간 각은 술 전 평균 17.2에서 술 후 평균 9.0도로 감소하였다. 또한 후족부 정렬상 경골-종골 각은 술 전 평균 외반 17.4도에서 술 후 평균 외반 4.5도로 호전되었다. 임상적으로는 VAS 통증 점수는 술 전 5.8점에서 술 후 1.5점으로, AOFAS 점수는 술 전 61.8점에서 술 후 90.4점으로 향상되었다. 합병증으로는 족근동 통증이 5예(35.7%)에서 발생하였다. 결론: 소아의 유연성 편평족 환자에서 족근동 삽입물을 이용한 거골하 관절 제동술을 시행하여 방사선적 및 임상적으로 우수한 결과를 얻었고, 편평족 변형에 대해 만족스러운 교정을 얻을 수 있었다. 하지만 수술 후 체중 부하 시 족근동 통증의 높은 발생 가능성에 대해서는 유념하여야 할 것이다. Purpose: The purpose of this study was to evaluate the radiographic and clinical outcomes of subtalar arthroereisis as a method of treatment for pediatric flexible flatfoot. Materials and Methods: We retrospectively investigated 14 feet among 10 patients with flexible flatfoot, who were treated with a subtalar arthroereisis using a sinus tarsi implant between March 2007 and June 2012. Radiographically, the talo-1st metatarsal angle, talar declination, and calcaneal pitch angle have all been measured on lateral radiographs. The talo-navicular coverage angle and talo-1st metatarsal angle was measured on anteroposterior (AP) radiographs and tibio-calcaneal angle was assessed by hindfoot alignment view. Visual analogue scale (VAS) pain scores and the American Orthopaedic Foot and Ankle Society (AOFAS) ankle-hindfoot scores were used for clinical evaluation. Results: The mean follow-up was 48.7 months (16–98 months), and the mean age was 11.6 years (6–19 years). Radiographically, the mean pre-operative and postoperative values measured by the lateral foot radiograph were -25.1° and -7.5° for talo-1st metatarsal angle, 37.4° and 23.2° for talar declination, and 8.3° and 15.0° for calcaneal pitch angle, respectively. The mean preoperative and postoperative values measured by foot AP radiograph were 23.0° and 11.9° for talo-navicular coverage angle and 17.2° and 9.0° for talo-1st metatarsal angle, respectively. Moreover, tibio-calcaneal angle improved from valgus 17.4° on average to 4.5° on average. Clinically, the VAS score and AOFAS score was improved from 5.8 to 1.5 and from 61.8 to 90.4, respectively. Complication was sinus tarsi pain that occurred in 5 cases (35.7%). Conclusion: We achieved a satisfactory correction of pediatric flexible flatfoot deformities via subtalar arthroereisis, using a sinus tarsi implant with favorable radiographic and clinical measures. However, high potential complication rate of postoperative sinus tarsi pain on weight-bearing should carefully be considered.

다중 트레이닝 기법을 이용한 MASK R-CNN의 초음파 DDH 각도 측정 진단 시스템 연구

황석민,이시욱,이종하,Hwang, Seok-Min,Lee, Si-Wook,Lee, Jong-Ha 한국융합신호처리학회 2020 융합신호처리학회 논문지 (JISPS) Vol.21 No.4

최근 영유아 성장기에 발생하는 고관절 이형성증(Developmental Dysplasia of Hip, DDH)의 숫자가 늘어나고 있다. DDH는 영유아 성장을 방해하고 다른 부작용도 많이 발생시키기 때문에 최대한 조기에 발견하여 치료해야 한다. 최근 들어 Convolutional Neural Networks (CNN) 및 개선된 Resnet50을 활용한 머신러닝 기법이 초음파 영상 분석에 많이 활용되고 있다. 연구 결과를 보면 컴퓨터 보조 이미지 분석이 의료현장에서 객관성과 생산성을 크게 향상시키고 있다. 본 연구의 결과는 정형외과에서의 난제인 초음파 영상을 통한 DDH 컴퓨터 보조 진단 알고리즘에도 충분히 활용될 수 있다는 것을 보여주고 있다. 본 논문에서는 CNN을 활용하여 DDH를 자동으로 측정하고 진단할 수 있는 컴퓨터 보조 진단 알고리즘을 제안하였다. DDH 측정을 위해 유아 고관절의 정상/비정상 판독을 위해 Acetabulum-Femoral head의 angle을 자동으로 계산하였으며 기존 영상을 딥 러닝하여 진단을 자동으로 하는 알고리즘을 설계하였다. 실험 결과 의사와 비교하여 진단의 속도와 정확도가 향상된다는 것을 확인하였다. Recently, the number of hip dysplasia (DDH) that occurs during infant and child growth has been increasing. DDH should be detected and treated as early as possible because it hinders infant growth and causes many other side effects In this study, two modelling techniques were used for multiple training techniques. Based on the results after the first transformation, the training was designed to be possible even with a small amount of data. The vertical flip, rotation, width and height shift functions were used to improve the efficiency of the model. Adam optimization was applied for parameter learning with the learning parameter initially set at 2.0 x 10e-4. Training was stopped when the validation loss was at the minimum. respectively A novel image overlay system using 3D laser scanner and a non-rigid registration method is implemented and its accuracy is evaluated. By using the proposed system, we successfully related the preoperative images with an open organ in the operating room

IQF 굴( Crassostrea gigas ) 복합엑스분의 추출 및 풍미개선

황석민 ( Seok Min Hwang ),황영숙 ( Young Suk Hwang ),남현규 ( Hyeon Gyu Nam ),이재동 ( Jae Dong Lee ),류성귀 ( Seong Gwi Ryu ),오광수 ( Kwang Soo Oh ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.6

To develop an effective use for poor-quality individually quick-frozen (IQF) oysters Crassostrea gigas stored for a long period, the extract conditions, quality characteristics, and optimum reaction flavoring (RF) conditions of a complex extract from these IQF oysters were investigated. The moisture, pH, and volatile basic nitrogen contents of IQF oysters stored for 18 months (18M-IQFO) were 77.9%, 6.32, and 17.9 mg/100 g, respectively. Three different kinds of extract were prepared from 18M-IQFO: a hot-water extract (HE), scrap enzymatic hydrolysate (EH), and complex extract (CE). The respective extracts contained 5.5, 8.6, and 6.6% crude protein and 281.7, 366.0, and 343.0 mg/100 g amino nitrogen, and had 811, 359, and 1,170 mL/kg extraction yields. The CE was superior to the traditional HE in terms of the extraction yield, amino-nitrogen content, and organoleptic qualities, except for the odor. To improve flavor via the Maillard reaction, the reaction system used to produce a desirable flavor comprised CE (Brix 30°), 0.4 M glucose, 0.4 M glycine, and 0.4 M cysteine solution (4:2:1:1, v/v). The reaction time and pH were the independent variables, and the sensory scores for baked potato odor, masking shellfish odor, and boiled meat odor were the dependent variables. The surface response methodology (RSM) analysis of the multiple responses optimization gave a reaction time of 120.6 minutes and pH 7.33 at 120°C. The reaction improved the flavor of CE considerably, as compared to that of the unreacted extract.

족저 근막염의 계절성에 대한 인터넷 검색어 데이터와 건강보험심사평가원 자료의 연관성

황석민,이금호,오승열,Hwang, Seok Min,Lee, Geum Ho,Oh, Seung Yeol 대한족부족관절학회 2021 대한족부족관절학회지 Vol.25 No.3

Purpose: This study examined whether there are seasonal variations in the number of plantar fasciitis cases from the database of the Korean Health Insurance Review & Assessment Service and an internet search of the volume data related to plantar fasciitis and whether there are correlations between variations. Materials and Methods: The number of plantar fasciitis cases per month was acquired from the Korean Health Insurance Review & Assessment Service from January 2016 to December 2019. The monthly internet relative search volumes for the keywords "plantar fasciitis" and "heel pain" were collected during the same period from DataLab, an internet search query trend service provided by the Korean portal website, Naver. Cosinor analysis was performed to confirm the seasonality of the monthly number of cases and relative search volumes, and Pearson and Spearman correlation analysis was conducted to assess the correlation between them. Results: The number of cases with plantar fasciitis and the relative search volume for the keywords "plantar fasciitis" and "heel pain" all showed significant seasonality (p<0.001), with the highest in the summer and the lowest in the winter. The number of cases with plantar fasciitis was correlated significantly with the relative search volumes of the keywords "plantar fasciitis" (r=0.632; p<0.001) and "heel pain" (r=0.791; p<0.001), respectively. Conclusion: Both the number of cases with plantar fasciitis and the internet search data for related keywords showed seasonality, which was the highest in summer. The number of cases showed a significant correlation with the internet search data for the seasonality of plantar fasciitis. Internet big data could be a complementary resource for researching and monitoring plantar fasciitis.

고령 환자에서 관찰되는 족관절 외과 골절 양상 및 잠김 압박 금속판 고정술의 임상 결과

황석민(Seok-Min Hwang),정홍근(Hong-Geun Jung),정형진(Hyung-Jin Chung),엄준상(Joon-Sang Eom),이동오(Dong-Oh Lee),조정현(Jung-Hyun Cho),박종태(Jong-Tae Park) 대한정형외과학회 2016 대한정형외과학회지 Vol.51 No.1

목적: 외과 골절의 치료에 있어 잠김 금속판의 이점에 관한 여러 연구 결과가 있었으나 고령의 외과 골절에 대한 연구는 많지 않았다. 따라서 고령의 외과 골절 양상과 잠김 금속판을 이용한 후 그 임상 결과에 대하여 고찰하였다. 대상 및 방법: 65세 이상의 외과 골절을 잠김 압박 금속판을 이용하여 수술 시행 후 1년 이상 추시가 가능했던 21명을 대상으로 연구를 시행하였다. Lauge-Hansen 및 Danis-Weber 골절 분류법을 사용하였으며, 임상적 평가는 최종 visual analog scale (VAS), American Orthopaedic Foot and Ankle Society (AOFAS) 점수, 만족도, 족관절 운동 범위를 평가하였고, 골 유합 및 내고정물 이완 등을 방사선적으로 평가하였다. 결과: 평균 나이는 71.2세, 최종 추시 평균 VAS는 1.6점, AOFAS는 94.2점이었으며, 18예(85.7%)에서 만족 이상의 만족도를 보였다. 분쇄 골절이 8예, 지연 나사 삽입이 가능한 군은 7예였다. 평균 골 유합 시기는 3.6개월이었다. 부정 유합은 5예 관찰되었고, 불유합, 정복 소실이나 내고정물 해리는 없었다. 결론: 본 연구에서 고령의 족관절 외과 골절은 술 후 만족도와 통증만이 유의한 관련이 있었으며, 잠김 압박 금속판은 자극 증상을 일으키는 경우가 있었으나 그 외 의미있는 합병증 없이 치료에 유용하였다. Purpose: Several studies have reported on the biomechanical advantages of a locking compression plate (LCP) for treatment of lateral malleolar fracture. However, few studies have reported clinical outcome after treatment of lateral malleolar fracture using a LCP in elderly patients. Thus, this study investigated the trends of lateral malleolar fractures in elderly patients and evaluated the clinical and radiological outcome of treating them using a ‘locking compression distal fibula plate’. Materials and Methods: Twenty-one patients (male: 3, female: 18) over 65 years old, who were followed-up for at least one year were enrolled in this study. They were treated surgically with open reduction and internal fixation using a LCP for lateral malleolar fracture from 2011 to 2014. Lauge-Hansen and Danis-Weber classification were used for preoperative classification of fractures. Visual analog scale (VAS) pain scores, the American Orthopaedic Foot and Ankle Society (AOFAS) ankle-hindfoot scores, 4-graded subjective satisfaction and post-operative range of motion were used for the clinical evaluation. Time to bone union, non-union, mal-union, metal failure and implant loosening were assessed for radiographic outcomes. Results: The mean age of patients was 71.2 years old, pain VAS and AOFAS score was 1.6 points and 94.2 points, respectively and 18 cases (85.7%) showed more than satisfaction in subjective satisfaction. Comminuted fracture was observed in 8 cases (38.1%) and lag screw insertion was performed in 7 ankles (33.3%). The mean bony union period was 3.6 months. There were 5 cases of mal-union, no case of non-union and metal failure. Conclusion: Satisfaction level of elderly patients with lateral malleolar fracture was significantly associated with only pain at the final follow-up. Fixation with a LCP distal fibula plate can sometimes lead to metal irritation but largely resulted in good clinical outcome without serious complication.

백색 발광다이오드(White LEDs)용 무기형광체 재료의 연구개발 현황

황석민,이재빈,김세현,류정호,Hwang, Seok Min,Lee, Jae Bin,Kim, Se Hyeon,Ryu, Jeong Ho 한국결정성장학회 2012 한국결정성장학회지 Vol.22 No.5

White LEDs (light-emitting diodes) are promising new-generation light sources which can replace conventional lamps due to their high reliability, low energy consumption and eco-friendly effects. This paper briefly reviews recent progress of oxy/nitride host phosphor and quantum dot materials with broad excitation band characteristics for phosphor-converted white LEDs. Among oxy/nitride host materials, $M_2Si_5N_8$ : $Eu^{2+}$, $MAlSiN_3$ : $Eu^{2+}$ M-SiON (M = Ca, Sr, Ba), ${\alpha}/{\beta}$-SiAlON : $Eu^{2+}$ are excellent phosphors for white LED using blue-emitting chip. They have very broad excitation bands in the range of 440~460 nm and exhibit emission from green to red. In this paper, In this review we focus on recent developments in the crystal structure, luminescence and applications of the oxy/nitride phosphors for white LEDs. In addition, the application prospects and current trends of research and development of quantum dot phosphors are also discussed. 백색 발광다이오드(white light-emitting diodes)를 이용한 광소자는 소비전력이 상대적으로 작고, 안정적이며, 수은과 같은 유해 중금속을 포함하지 않기 때문에, 에너지 절약 및 친환경 산업측면에서 유망한 산업으로 급속히 발전하고 있다. 국내의 경우 LED 조명의 효율, 신뢰성, 연색성을 향상시키는데 필수 소재인 형광체의 기술 확보에 대한 관심이 높아지고 있다. 이러한 관점에서 기존의 YAG, TAG, silicate 계열 산화물 형광체 뿐만 아니라 고온특성이 우수한 산/질화물계 형광체 개발에 대한 관심이 높아지고 있다. 특히 산/질화물계 형광체 조성에서 $M_2Si_5N_8$ : $Eu^{2+}$, $MAlSiN_3$ : $Eu^{2+}$ M-SiON(M = Ca, Sr, Ba), ${\alpha}/{\beta}$-SiAlON : $Eu^{2+}$과 같은 재료는 440~460 nm 영역에서의 넓은 여기파장과 우수한 발광효율로 청색 LED 칩을 이용한 백색 LED에 넓게 사용되고 있다. 이 논문에서는 이러한 산/질화물계 형광체 조성의 결정학적, 광학적 특성 및 응용에 대해서 정리하였다. 또한 최근에 주목받고 있는 양자점(quantum dots) 형광체를 응용한 white LEDs의 개발동향에 대해서도 알아보도록 한다.