치근단 감염 치아의 치근단 수술 후 예후에 관한 후향적 연구

김현민,박철휘,이상칠,김동우,박대송,정진환,이슬기,송민석,Kim, Hyeon-Min,Park, Chul-Hwi,Lee, Sang-Chil,Kim, Dong-Woo,Park, Dae-Song,Jung, Jin-Hwan,Lee, Seul-Ki,Song, Min-Seok 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.3

Purpose: The purpose of this retrospective clinical study was to monitor the outcomes of periapical surgery in periapically infected tooth with or without retrograde filling materials (MTA or IRM). Patients and Methods: A total of 85 teeth in 63 patients were included in the study between November 2004 and August 2008. Randomly, MTA or IRM was used as a retrograde filling material or only apical resection without retrograde filling. Teeth with advanced periodontal bone loss or presence of root fracture were excluded from the study. The patients were subjected to a minimum follow-up period of 12 months, with a mean of 17.1 months. Results: Successful healing was observed in 83.3% of the MTA-treated teeth, 80% of the IRM-treated teeth and 75% of the teeth which was not retrograde filling. Doubtful healing was seen 9.3% (MTA), 13.3% (IRM), 12.5% (no retro-filling). The success rate of upper incisors (92%) was higher than lower lincisor and molars (66.7% and 50%, respectively). Conclusion: In this study, periapical surgery including retrograde filling improves the prognosis. And, no statistically significant differences were found between retrograde filling materials (MTA or IRM).

Taguchi 법에 의한 흑목이버섯의 항산화활성 증진을 위한 열수추출 최적화

김현민 ( Hyeon Min Kim ),허원 ( Won Hur ),이신영 ( Shin Young Lee ) 한국산업식품공학회 2011 산업 식품공학 Vol.15 No.3

Optimization study of the hot water extraction for enhancing antioxidative activity from Auricularia auricula was performed by Taguchi approach using orthogonal matrix L9(3(4)) method. The correlation between DPPH radical scavenging activity and the components of samples extracted from different extraction conditions were also analyzed. The correlation coefficient between DPPH radical scavenging activity and melanin content of A. auricula was 0.93, indicating ``good correlation``. The optimum extraction conditions were obtained at the extraction time of 1 hr. temperature of 85℃, solid: water ratio of 1: 40(w/v) and frequency of 2 times. Under these conditions, values of maximum DPPH free radical scavenging activity and melanin contents of A. auricula were 67.21±2.17 and 52.94±2.10 mg/g, respectively. Melanin content of 1.6 times and DPPH free radical scavenging effect of 130% were enhanced by optimization.

하절기 ‘매향’ 딸기의 삽목 번식 시 관수방법에 따른 생육 및 발근율

김현민(Hyeon Min Kim),김혜민(Hye Min Kim),정현우(Hyeon Woo Jeong),이혜리(Hye Ri Lee),정병룡(Byoung Ryong Jeong),강남준(Nam Jun Kang),황승재(Seung Jae Hwang) (사)한국생물환경조절학회 2018 생물환경조절학회지 Vol.27 No.2

본 연구는 하절기 ‘매향’ 딸기 자묘의 삽목 번식에 적절한 관수 방법을 구명하기 위해 수행되었다. 딸기 자묘의 삽수는 24구 딸기 전용 포트(24구, 60 × 34 × 10cm)에 상업용 혼합 상토(Tosilee)를 이용하여 삽목하고, 반밀폐형 소형비닐터널에 위치시켰다. 각각의 반 밀폐형 소형터널의 처리는 다음과 같이 처리했다; 대조구(무처리), 두상관수(하루 두 번), 매트관수(하루 두 번), 그리고 안개관수(8:00시부터 18:00시까지 30분 온/오프 설정). 딸기 자묘는 반 밀폐형 소형터널 내에서 8일 동안 발근을 하였고, 그 이후 플라스틱 필름을 제거 하였다. 삽목 후 61일째에 초장, 근장, 1차 근수, 엽병장, 엽장, 엽폭, 크라운 직경, 엽록소 값, 엽면적, 지상부와 지하부의 생체중 및 건물중을 측정하였다. 터널 내의 하루 평균 상대습도는 각각 안개관수, 두상관수, 매트관수, 대조구 순으로 72.5, 56.3, 45.8, 그리고 29%를 나타냈다. 그러나 공기온도는 모든 처리에서 유사하였다. 딸기 자묘의 4일째와 8일째 발근율은 두상관수와 안개관수 처리에서 유의적으로 높았다. 초장, 엽병장, 크라운 직경, 엽면적은 두상관수와 안개관수 처리에서 높은 값을 나타냈다. 게다가 지상부의 생체중 및 건물중은 다른 처리에 비해 두상관수와 안개관수 처리에서 무거웠다. 지하부의 건물중은 안개관수 처리에서 유의적으로 무거웠다. 하지만 근장, 1차 근수, 엽록소 값, 지하부의 생체중은 모든 처리구에서 유의적인 차이를 나타내지 않았다. 결과적으로, ‘매향’ 딸기의 삽목 번식 시 생육과 발근율은 두상관수와 안개관수 처리에서 가장 효과적인 것으로 나타났다. This study was conducted to investigate the optimum irrigation method for propagation of cutting strawberry (Fragaria × ananassa Duch. cv. Maehyang) plantlet in summer season. The cutting strawberry plantlets were planted in 24-cell tray (60 × 34 × 10 cm) filled with commercial mixed medium (Tosilee) and placed in semi closedtype small plastic tunnel. Each semi closed-type small plastic tunnel was treated as follows; control (non-treatment), over head irrigation (twice a day), capillary mats irrigation (twice a day), or fog irrigation (30 minutes turn on and 10 minutes off from 8:00 to 18:00). The strawberry plantlets were rooted during 8 days in the semi closed-type small plastic tunnel, and then plastic film was removed. Growth parameters, such as plant height, root length, number of primary roots, petiole length, leaf length, leaf width, crown diameter, SPAD, leaf area, fresh and dry weights of the shoot and root, were measured at 61 days after cutting. Relative humidity in tunnel was high in the order by fog irrigation, over head irrigation, capillary mats, and the control as 72.5, 56.3, 45.8, and 29% on average, respectively. However, the air temperature was similar in all treatments. On the 4 and 8 days, the rooting rate of strawberry plantlet was significantly higher in the over head irrigation and fog irrigation treatments. Plant height, petiole length, crown diameter, and leaf area were highest in the over head irrigation and fog irrigation treatments. In addition, fresh and dry weights of shoot were greater in over head irrigation and fog irrigation treatments than the others. Dry weight of root was differed significantly heaviest in the fog irrigation treatment. However, root length, no. of primary roots, SPAD value, and fresh weight of root were not significantly different in all treatments. These results indicated that growth and rooting for propagation of cutting strawberry plantlet ‘Maehyang’ were best achievement in the over head irrigation and fog irrigation treatments.

흰목이와 흑목이 버섯의 다당추출 및 유리라디칼 소거활성 비교

김현민 ( Hyeon Min Kim ),허원 ( Won Hur ),이신영 ( Shin Young Lee ) 한국산업식품공학회 2011 산업 식품공학 Vol.15 No.1

The polysaccharides from fruit body of Auricularia auricula and Tremella fuciformis were extracted using hot water, and partially purified through ethanol precipitation and dialysis. Free radical scavenging activities of the crude and purified polysaccharides were examined and compared each other. Free radical scavenging activities of the partially purified polysaccharides were higher than those of crude polysaccharides. DPPH free radical, ABTS radical and SOD-like activities of partially purified polysaccharide at 1 mg/mL of concentration from A. auricula were 61.7, 9.6 and 38.9%, respectively, while those of T. fuciformis were 9.6, 5.7 and 15.3%, respectively. Results of site and nonsite specific hydroxyl radical scavenging activities indicated that the partially purified polysaccharide fractions from A. auricula and T. fuciformis exhibited the hydroxyl radical scavenging effect by hydrogen donating ability and iron ion chelating ability. Also, reducing powers of A. auricula and T. fuciformis were 77.1 and 14.7% of BHT (0.1%) as standard, respectively. It was suggested that antioxidant activities of A. auricula were about 1.4~6.4 times higher than those of T. fuciformis due to different levels of polyphenol content.

셀룰러 네트워크에서 비면허 대역을 활용한 단말 간 직접통신 타당성 연구

김현민(Hyeon-Min Kim),강길모(Gil-Mo Kang),신오순(Oh-Soon Shin) 한국전자파학회 2016 한국전자파학회논문지 Vol.27 No.2

단말 간 직접통신(D2D: Device-to-Device) 기술은 지리적으로 근접한 단말들이 네트워크 인프라를 거치지 않고 직접적으로 통신하는 기술이다. 특히 셀룰러 네트워크에서는 D2D 통신이 셀룰러 자원을 공간적으로 재사용함으로써 주파수이용 효율을 향상시킬 수 있다. 하지만 셀룰러 단말의 채널 시변성 및 그에 따른 자원 할당 변화로 인해 셀룰러 자원을 재사용하는 D2D 단말의 채널 품질을 지속적으로 유지할 수 없고, 셀룰러 단말 또한 간섭에 의해 성능이 열화될 수 있다. 따라서 본 논문에서는 D2D 링크가 셀룰러 네트워크의 상향링크 자원을 재사용하는 상황에서 셀룰러 단말의 채널 변화로 인한 D2D 통신 링크의 성능 열화를 완화하는 방안으로 비면허 대역 주파수 자원을 D2D 통신에 보조적으로 활용하는 기술을 제안한다. 모의실험을 통해 제안한 기술의 효용성을 검증한다. Device-to-Device communication(D2D) enables devices in proximity to communicate directly without going through the network infrastructure. In particular, D2D communications in a cellular network can improve the spectral efficiency by allowing the reuse of cellular resources. However, it is not easy to maintain the channel quality of the D2D links and to protect the cellular links from the D2D interferences, since the resource allocations for the cellular users will change with time due to the time-varying nature of the cellular channels. To mitigate the performance degradation of D2D links, we propose to exploit unlicensed bands as auxiliary resources when the D2D links share the uplink cellular resources. The effectiveness of the proposed scheme is verified through simulations.

밀폐형 식물 생산 시스템에서 형광등 종류에 따른 시금치의 생육 및 기능성물질 함량

김현민(Hyeon Min Kim),김혜민(Hye Min Kim),이혜리(Hye Ri Lee),이재은(Jae Eun Lee),황승재(Seung Jae Hwang) (사)한국생물환경조절학회 2017 생물환경조절학회지 Vol.26 No.4

본 연구는 밀폐형 식물생산 시스템에서 다양한 형광등 종류에 따른 시금치 ‘수시로’의 생육과 기능성물질 함량에 미치는 영향을 구명하기 위해 수행되었다. 종자는 128구 플러그 트레이에 암면을 이용하여 파종되었다. 시금치 묘는 재순환 담액식 수경재배 시스템을 이용하여 EC 1.5dS·m<SUP>-1</SUP>, pH 6.5의 밀폐형 식물생산 시스템에 정식되었다. 묘는 3가지 종류의 형광등 #S(NBFHF 32S8EX-D, CH LIGHTING Co. Ltd., China), #O( FHF32SSEX-D, Osram Co. Ltd., Germany), #P(FLR32SS EX-D, Philips Co. Ltd., The Netherlands)에 광도 150μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP> PPFD와 광주기 14/10 (명기/암기)으로 설정했다. 정식 후 재배환경은 온도 25±1℃와 상대습도 60±10% 였다. 정식 후 6주간 각 처리마다 30개체를 재배하였고, 생육 및 기능성 물질 함량을 3주째와 6주째 측정했다. 정식 후 3주째, #O 형광등에서 다른 처리구에 비해 초장과 엽폭이 유의적으로 컸다. 그러나 지하부의 생체중과 건물중은 #P 형광등에서 가장 높았다. 또한 총페놀 함량은 #P 형광등에서 유의적으로 가장 높았다. 정식 후 6주째, #O 형광등에서 초장, 지상부의 생체중 및 건물중에서 시금치의 생육이 향상되는 효과를 보였다. 총페놀 함량도 #O 형광등에서 다른 처리구에 비해 유의적으로 증가하였다. 그러나 항산화 활성은 모든 처리구에서 유의적인 차이를 나타내지 않았다. 따라서 이러한 결과는 밀폐형 식물생산 시스템에서 #O 형광등 처리가 시금치의 생육과 기능성물질 함량 축적에 효과적인 것으로 나타났다. This study was conducted to examine the growth and phytochemical contents of spinach (Spinacia Oleracea L. ‘Sushiro’) as affected by different fluorescent lamps in a closed-type plant production system. Seeds were sown in a 128-cell plug tray filled in rockwool. The seedlings were transplanted into a DFT (deep floating technique) system with recycling nutrient solution (EC 1.5 dS·m<SUP>-1</SUP> and pH 6.5) in a closed-type plant production system. The seedlings were grown under 3 types of fluorescent lamp, #S (NBFHF 32S8EX-D, CH LIGHTING Co. Ltd., China), #O (FHF32SSEX-D, Osram Co. Ltd., Germany), and #P (FLR32SS EX-D, Philips Co. Ltd., The Netherlands) at 150 μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP> PPFD with a photoperiod of 14/10 (light/dark) hours. Plants were cultured under condition of 25 ± 1℃ temperature and 60 ± 10% relative humidity after transplanting. Thirty plants per each treatment were cultivated for 6<SUP>th</SUP> week after transplanting. And growth and phytochemical contents were measured at 3<SUP>rd</SUP> and 6<SUP>th</SUP> week. At the 3<SUP>rd</SUP> week after transplanting, the parameter values of plant height and leaf width were higher in the #O than the others. However, fresh and dry weights of root were the greatest in the #P. In addition, total phenolic concentration was the greatest in the #P. At 6<SUP>th</SUP> week after transplanting, the #O had the greatest growth of spinach in the plant height and fresh and dry weights of shoot. The total phenolic contents significantly increased in the #O and showed significantly difference. However, there was no significant difference all treatments in antioxidant activity. Therefore, these results suggest that the #O was suitable for the growth and phytochemical accumulation of spinach in a closed-type plant production system.

브러싱 자극을 이용한 오이와 토마토 공정묘의 초장 억제

김현민(Hyeon Min Kim),이혜리(Hye Ri Lee),정현우(Hyeon Woo Jeong),김혜민(Hye Min Kim),황승재(Seung Jae Hwang) (사)한국생물환경조절학회 2018 생물환경조절학회지 Vol.27 No.4

본 연구는 환경 친화적 방법인 브러싱을 이용한 기계적 자극의 영향을 받는 오이와 토마토 플러그 묘의 생육 억제 효과를 구명하기 위해 수행되었다. 오이(Cucumis sativus L. ‘Joeunbaekdadagi’)와 토마토(Solanum lycopersicum L. ‘Mini Chal’)를 2017년 10월 9일 상업용 혼합 상토가 충진된 40구 플러그 트레이(54×27.5×5cm)에 파종하였다. 벤로형 유리온실의 재배환경은 15-25℃의 재배 온도 범위와 50±10%의 상대습도를 유지하였다. 파종 15일후에, 오이와 토마토 묘에 무처리(대조구), 7.5mg·L<SUP>-1</SUP>의 diniconazole을 처리하였다. 또한, 오이와 토마토의 brushing 처리는 2, 4, 또는 6시간 간격으로 각각 15일과 20일간 적용되었다. 1회씩 brushing 처리를 하였다. 오이와 토마토의 초장, 하배축, 절간장은 대조구에 비해 diniconazole 처리에서 억제되었다. 잎의 크기는 오이와 토마토 모두 감소하였지만, 반면에 엽록소 값은 diniconazole 처리에서 증가하였다. 그러나 오이의 경경은 2시간 brushing 간격 처리에서 가장 두꺼웠다. 지상부와 지하부의 생체중은 diniconazole 처리에서 유의적으로 낮았다. Brushing의 적용은 토마토묘의 지상부와 지하부의 건물중, 충실도를 촉진시킴으로써 묘소질을 향상 시켰다. 토마토 묘의 엽록소 형광은 2시간 처리에서 급격히 감소하였으며, 이는 brushing 처리에 의한 기계적 스트레스를 나타낸다. 토마토 묘의 상대 생장률은 diniconazole 처리에서 유의적으로 낮았지만, 오이 묘는 모든 처리에서 유의적인 차이가 없었다. 결과적으로, 오이와 토마토 묘의 생육 억제는 생장조절제의 화학 물질에 의한 diniconazole 처리에서 가장 효과적이었다. 그러나 환경 친화적인 관점에서, 2시간의 brushing 간격 처리는 오이와 토마토 묘의 생장에서 화학적 방법을 대체할 수 있는 응용 가능성을 가지고 있다고 판단된다. This study aimed to evaluate the effect of height suppression of cucumber and tomato plug seedlings as affected by mechanical stimulus using brushing as environment-friendly method. Cucumber (Cucumis sativus L. ‘Joeunbaekdadagi’) and tomato (Solanum lycopersicum L. ‘Mini Chal’) seeds were sown in 40-cell plug trays (54 × 27.5 × 5 cm) filled with growing medium on Oct. 9, 2017. The cultivation environment in a venlo-type glasshouse was maintained as cultivation temperature range of 15 - 25℃ and the relative humidity of 50 ± 10%. Nontreatment and diniconazole (7.5 mg·L<SUP>-1</SUP>) application at 15 days after sowing were used as the control. In addition, brushing treatments in cucumber and tomato were applied interval of 2, 4 or 6 hrs for 15 and 20 days, respectively. Plant height, hypocotyl length, and internode length were inhibited for cucumber and tomato in the diniconazole treatment than in the control. The leaf size was reduced, both cucumber and tomato, while the SPAD increased under the diniconazole treatment. However, stem diameter of cucumber was the thickest in the 2 hrs brushing interval treatment. Fresh weights of shoot and root were the significantly lowest in the diniconazole treatment. Application of brushing improved seedlings quality by promoting dry weights of shoot and root, and compactness of tomato seedlings. The chlorophyll fluorescence of tomato seedlings drastically decreased with 2 hrs treatment, indicating that mechanical stress by brushing treatment. The relative growth rate of tomato seedlings was significantly lower in the diniconazole treatment, but cucumber seedlings were not significantly different in all treatments. As a results, height suppression of cucumber and tomato seedlings was best achievement in the diniconazole treatment by the chemical as growth regulator. In an environment-friendly point of view, however, it is considered that 2 hrs brushing interval treatment can be the applicability for replacing the chemical methods in plug seedling growth of cucumber and tomato.

흑목이 버섯 열수추출 다당의 성분 및 구조적 특성

김현민(Hyeon-Min Kim),허원(Won Hur),이신영(Shin-Young Lee) 한국생물공학회 2009 KSBB Journal Vol.24 No.6

A hot-water extract from fruit body of Auricularia auricula was purified by ethanol precipitation and subsequent dialysis. The polysaccharide showed a typical IR spectrum similar to β-glucan and was composed of glucose and mannose in a molar ratio of 16.8:83.2 indicating that it is a glucomannan. A glucomannan-like polysaccharide was also identified from Tremella fuciformis. Both of the polysaccahrides showed the presence of acetyl groups and presented colorimetric responses for β-1,4-glucomannan indicating the acetylated β-glucomannan similar to the typical polysaccharide found in Aloes.

다중 셀 네트워크에서 다중 D2D 통신 자원할당 기법

김현민(Hyeon-Min Kim),강길모(Gil-Mo Kang),신오순(Oh-Soon Shin) 대한전자공학회 2016 전자공학회논문지 Vol.53 No.9

셀룰러 네트워크 환경에서 단말 간 직접통신(D2D : Device-to-Device)을 위해서는 기존의 셀룰러 링크의 성능을 보장함과 동시에 D2D 통신 링크의 성능을 극대화하는 것이 중요하다. 따라서 D2D 통신에 사용할 자원을 할당함에 있어 D2D 송신 단말이 셀룰러 시스템에 미치는 간섭과 셀룰러 시스템이 D2D 수신 단말에 주는 간섭을 동시에 고려해야 한다. 본 논문에서는 D2D 송신기와 수신기로 이루어진 D2D 링크가 셀룰러 시스템의 상향링크 자원을 공유하는 상황에서 복수의 D2D 링크에 효과적으로 자원을 할당하는 기법을 제안한다. 기지국은 인접 셀의 기지국과 정보 교환을 통해 셀 내의 단말들의 위치 정보를 공유한다는 가정 하에 단말들의 단말 위치 정보를 이용하여 D2D 링크와 셀룰러 링크 사이의 간섭을 최소화하는 자원을 할당한다. 아울러 경로손실 모델을 이용하여 계산한 셀룰러 링크 보호 상수 및 D2D 링크 보호 상수를 이용하여 셀룰러 링크와 D2D 링크 상호간의 간섭 및 D2D 링크 간의 간섭을 제한한다. 모의실험을 통해 제안한 자원할당 기법의 성능을 검증한다. In D2D communications underlaying a multicell network, it is of primary importance to ensure coexistence of cellular links and D2D links with minimal interference. Therefore, resource allocation scheme for D2D links should be designed to limit the interference between cellular links and D2D links. In this paper, we propose an effective resource allocation scheme for multiple D2D links which share the uplink spectrum resource with cellular users in a multicell network. Under the assumption that the locations of users are known to the base station, the proposed scheme allocates cellular resources to D2D links, such that the interference between a cellular link and multiple D2D links is minimized. In particular, we compute two constants from the path loss model and then use the constants to protect both cellular and D2D links. Simulation results are provided to verify the performance of the proposed scheme.

현장 실측을 통한 Pico-Hydropower System(PHPS)의 건물 급수설비 적용성 검토

김현민(Hyeon Min Kim),이신혜(Shin Hye Lee),정창호(Chang Ho Jeong),여명석(Myeong Seok Yeo) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6

A pico-hydropower system (PHPS) can be utilized as a renewable clean energy in building in-pipe system, but its feasibility is still on debate. This is because of the lack of related standards and limited real-site installations. In this study, some paper reviews regarding PHPS and building integrated PHPS examples are introduced. Also, data had been collected from the only PHPS-installed residential building in Korea to analyze the amount of generated power and the in-pipe water flow condition, e.g., pressure, from March 28, 2022 to May 2, 2022. The results show that the daily average energy generation is 21.1kWh and its standard deviation is only about 7%, which implies that the stable daily energy production can be expected from PHPS.