Ceromer의 법랑질 및 금합금에 대한 마모도 비교

정희경,양홍서,Jung Hee-Kyung,Yang Hong-So 대한치과보철학회 2001 대한치과보철학회지 Vol.39 No.1

This study was performed to compare the abrasiveness and wear resistance of several restorative materials occluding enamel and gold alloy. Intact labial surface of bovine incisor and the plain portion of type III gold alloy were used as plate specimens, and pin specimens were fabricated using $Artglass^{(R)},\;Targis^{(R)},\;Sculpture^{(R)}$. After two-body wear test using pin and plate model, amount of vertical height loss of plate and pin specimens were measured and statically analyzed. The amount of vertical height loss of plate specimens against pin specimens were measured by a roughness measurement instrument. The amount of vertical height loss of pin specimens against plate specimens were measured by an image analyzing program after taking scanning electron micrographs of pin specimens. The results were as following. 1. As fir the amount of enamel wear. gold group showed least amount of wear. There was no significant difference among Sculpture, Targis and Artglass groups(p<0.05). 2. As for the amount of gold wear Sculpture group standed first and Targis and Artglass group followed respectively, and there was significant difference between Sculpture and Artglass groups(p<0.05). 3. As for the amount of restorative materials against enamel, Artglass group showed greatest, and there was no significant difference among gold. Sculpture, Targis groups(p<0.05). 4. As for the amount of restorative materials against gold, Artglass group standed first and Targis and Sculpture group followed respectively, and there was significant difference among each groups(p<0.05).

빅 데이터 분석능력과 기업 성과 간의 관계에서 혁신 및 개선 활동과 시장 민첩성의 영향

정희경,부제만,Jung, He-Kyung,Boo, Jeman 한국산업경영시스템학회 2022 한국산업경영시스템학회지 Vol.45 No.3

This study investigated the impact of the latest developments in big data analytics capabilities (BDAC) on firm performance. The BDAC have the power to innovate existing management practices. Nevertheless, their impact on firm performance has not been fully is not yet fully elucidated. The BDAC relates to the flexibility of infrastructure as well as the skills of management and firm's personnel. Most studies have explored the phenomena from a theoretical perspective or based on factors such as organizational characteristics. However, this study extends the flow of previous research by proposing and testing a model which examines whether organizational exploration, exploitation and market agility mediate the relationship between the BDAC and firm performance. The proposed model was tested using survey data collected from the long-term employees over 10 years in 250 companies. The results analyzed through structural equation modeling show that a strong BDAC can help improve firm performance. An organization's ability to analyze big data affects its exploration and exploitation thereby affecting market agility, and, consequently, firm performance. These results also confirm the powerful mediating role of exploration, exploitation, and market agility in improving insights into big data utilization and improving firm performance.

국내산과 수입산 송이의 다량 및 미량 미네랄 함량 비교

정희경,김경제,서경순,진성우,고영우,임승빈,하늘이,김중범,Jeong, Hee-Gyeong,Kim, Kyung-Je,Seo, Kyoung-Sun,Jin, Seong-Woo,Koh, Young-Woo,Im, Seung-Bin,Ha, Neul-I,Kim, Jung-Beom 한국식품위생안전성학회 2022 한국식품위생안전성학회지 Vol.37 No.5

The mineral content of Tricholoma matsutake was evaluated for comparison of mineral contents according to the area of cultivation. Ten domestic and thirty Chinese (10 Yanji, 10 Yunnan and 10 Tibet) T. matsutake specimens were assessed using an atomic absorption spectrophotometer (AAS) and inductively coupled plasma mass spectrometer (ICP-MS). The Na, Mg, K, and Ca contents of domestic T. matsutake were 128.12±85.25 mg/kg, 218.52±105.35 mg/kg, 7,534.58±2,691.52 mg/kg, and 17.69±7.14 mg/kg, respectively, while those of Yanji T. matsutake were 124.89±57.24 mg/kg, 64.07±27.52 mg/kg, 1,439.18±311.04 mg/kg, and 10.88±4.52 mg/kg, respectively. The Na, Mg, K, and Ca contents of Yunnan T. matsutake were 90.78±23.23 mg/kg, 77.40±28.36 mg/kg, 1,446.29±126.33 mg/kg, and 28.42±5.18 mg/kg respectively, while those of Tibet T. matsutake were 143.50±41.54 mg/kg, 124.64±50.18 mg/kg, 3,530.95±2,714.99 mg/kg, and 21.05±8.71 mg/kg, respectively. The Cu contents of domestic, Yanji, Yunnan, and Tibet T. matsutake were 105.43±32.97 mg/kg, 19.92±8.95 mg/kg, 54.51±16.91 mg/kg, and 64.80±23.01 mg/kg, respectively. Both domestic and Chinese T. matsutake samples showed significantly different K, Mg, and Cu levels in this study. Therefore, a comparative evaluation of the K, Mg, and Cu contents of multiple domestic and Chinese T. matsutake varieties is needed to determine the appropriate area of cultivation in the future.

국내산과 중국산 능이의 미네랄 함량 비교

정희경,김경제,서경순,진성우,고영우,임승빈,하늘이,김중범,Jeong, Hee-Gyeong,Kim, Kyung-Je,Seo, Kyoung-Sun,Jin, Seong-Woo,Koh, Young-Woo,Im, Seung-Bin,Ha, Neul-I,Kim, Jung-Beom 한국버섯학회 2021 한국버섯학회지 Vol.19 No.1

국내산과 중국산 능이에 대한 다량미네랄, 미량미네랄 및 유해중금속 함량을 비교하여 원산지 판별 가능성을 분석하고자 하였다. 능이의 미네랄 함량은 원자흡광광도계(Atomic absorption spectrophotometer, AAS) 및 유도결합플라즈마 질량분석기(Inductively coupled plasma mass spectrometer, ICP-MS)를 사용하여 분석하였다. 국내산 능이의 Na, Mg, K 및 Ca 함량은 각각 170.3±44.0 mg/kg, 81.3±20.8 mg/kg, 1,123.8±274.3 mg/kg 및 12.1± 4.1 mg/kg으로 분석되었으며, 중국산 능이는 각각 112.2±40.8 mg/kg, 297.8±20.9 mg/kg, 10,938.4±2,914.1 mg/kg 및 52.5±27.7 mg/kg으로 분석되어 유의적 차이가 있는 것으로 나타났다. 미량미네랄 및 유해중금속 함량은 유의적 차이가 나타나지 않았다. 따라서 능이의 원산지 판별 지표 확립을 위하여 향후 다수의 국내산 및 중국산 능이를 사용한 Na, Mg, K 및 Ca 함량 비교분석이 필요한 것으로 판단되었다. The mineral contents of domestic and Chinese Sarcodon aspratus were analyzed for comparing the differences in the mineral contents according to the production sites. The mineral contents of 10 domestic and 10 Chinese S. aspratus were analyzed by using an atomic absorption spectrophotometer and an inductively coupled plasma mass spectrometer. The sodium, magnesium, potassium, and calcium contents of domestic S. aspratus were 170.3±44.0 mg/kg, 81.3±20.8 mg/kg, 1,123.8±274.3 mg/kg, and 12.1±4.1 mg/kg, respectively, while those of Chinese S. aspratus were 112.2±40.8 mg/kg, 297.8±20.9 mg/kg, 10,938.4±2,914.1 mg/kg, and 52.5±27.7 mg/kg, respectively. There were no significant differences in the micro mineral contents and hazardous heavy metal contents between domestic and Chinese S. aspratus, while there was a significant difference in the macro mineral contents between domestic and Chinese S. aspratus. Thus, the comparative analyses of the sodium, magnesium, potassium, and calcium contents of many domestic and Chinese S. aspratus are required to determine their production sites in the future.

멀티미디어 프리젠테이션 시스템을 위한 보정적 동기화 알고리즘

정희경,Jung, H.K. 배재대학교 자연과학연구소 1995 自然科學論文集 Vol.8 No.1

This paper describes the design and implementation of multimedia presentation system based on the compensative synchronization algorithm. We proposed the compensative synchronization algorithm in compensation for previously preestimated delay-time in order to minimize delay-time in multimedia presentation system. The presentation system uses compensative synchronization algorithm and have multimedia objects as text, raster graphics, geometric graphics, or audio. 본 논문은 멀티미디어 프리젠테이션을 위한 보정적 동기화 알고리즘에 관한 연구이다. 멀티미디어 프리젠테이션 시스템에서 표현되는 미디어들의 지연시간을 미리 예측하여 보정해 줌으로써 지연시간을 최소화하는 보정적 동기화 알고리즘을 제안하였다. 이 보정적 동기화 알고리즘을 이용하여 텍스트, 라스터 그래픽스, 도형 그래픽스, 오디오와 같은 미디어 객체를 갖는 멀티미디어 프리젠테이션 시스템을 설계 구현하였다.

소아에서 발생한 갑상설관낭종의 재발에 영향을 미치는 위험인자

정희경,박진영,Jung, Hee-Kyung,Park, Jin-Young 대한소아외과학회 2011 소아외과 Vol.17 No.1

Thyroglossal duct cysts (TGDC) are the most common type of congenital developmental anomaly encountered in the anterior midline of the neck in childhood. The aim of the study was to evaluate the clinical characteristics of TGDC and identify any factors that could be related to recurrence after surgery. This study consisted of a retrospective chart review of 45 patients treated at Kyungpook National University Hospital for TGDC between 1990 and 2008. All records were reviewed for age and sex, length of history, presentation, diagnostic methods, sizes and locations of cyst, surgical management, histopathology of the lesion and recurrences. The statistical analysis of risk factors for recurrence was made using the Fisher's exact test with a significance level of p (0.05. The male to female ratio was 2.2:1 with a male preponderance. The mean age at operation was 5 years and 2 months (4 months - 17 years). The most common presenting symptom was a nontender cervical mass (78 %). Most TGDC were found in the midline position. Twenty four were infrahyold, 17 were hyoid, and 4 were suprahyoid level. Forty one (91 %) patients received the Sistrunk operation, and 4(9 %) patients received Cyst excision. Postoperative a seroma developed in six patients in the early postoperative days. There were a total of 3(6.6 %) recurrences, 2 in patients who had excision only and in one patient who had the Sistrunk operation. Univariate analysis for risk factors with recurrence showed that there was no statistical relationship between the presence of preoperative infection and the development of recurrence. The removal of hyoid bone along with TGDC was a statistically significant risk factor for recurrent disease. This study suggests that the Sistrunk operation Is the treatment of choice for TGDC in order to reduce recurrence.

전통 누룩으로부터 분리된 Killer Toxin 생산 균주 Pichia anomala K15의 특성

정희경,박치덕,이기동,박승춘,박환희,홍주헌,Jung, Hee-Kyoung,Park, Chi-Duck,Lee, Gee-Dong,Park, Seung-Chun,Park, Hwan-Hee,Hong, Joo-Heon 한국식품영양과학회 2007 한국식품영양과학회지 Vol.36 No.8

본 연구에서는 발효식품의 저장기간을 연장하거나 이상발효를 방지하기 위해 미생물 유래의 천연 항균성 물질인 killer toxin 생산 균주인 K3, K5, K11, K12, K15를 전통누룩으로부터 분리하였다. 분리된 killer toxin 생산 균주 중 식중독의 원인균인 Salmonella Typhimurium 및 장염비브리오의 원인균인 Vibrio parahaemolyticus의 생육을 저해하며, killer toxin 활성이 가장 우수한 K15를 최종 선발하고 이를 Biolog사 동정시스템과 ITS영역의 염기서열 homology를 조사하여 동정한 결과, Pichia anomala에 99% 상동성을 나타내어 Pichia anomala K15로 명명하였다. P. anomala K15가 생산하는 killer toxin은 단백질 분해효소에 의해 불활성화 되므로 인체에서 단백질 분해효소에 의해 쉽게 분해가 가능한 안전한 항균물질임을 확인할 수 있었다. 또한 p. anomala K15는 에탄올 내성은 약하나 고농도의 당에서 저항성이 크므로 주조 발효초기 환경에서의 이상발효를 방지할 수 있을 것으로 사료되어진다. In this study, killer yeasts were isolated from traditional Nuruk to improve storage and suppress contaminant in food industry. Among killer yeasts, yeast K15 showed strong killer toxin activity and inhibited growth of Salmonella Typhimurium and Vibrio parahaemolyticus. Killer yeast K15 was identified with Pichia anomala by the Microlog TM 4.0 identification system and homology of the ITS sequence. Killer toxin generated from P. anomala K15 was inactivated by pronase E and suggested to be a protein. Therefore killer toxin of P. anomala K15 was thought to be safe in human such as bacteriocin. P. anomala K15 was sufficient for growth in 50% glucose and could be used to prevent contaminant in initial stages of alcohol beverage fermentation.

Rat에서 Paenibacillus polymyxa JB115의 병원성 및 ${\beta}$-glucan 함유 배양산물에 대한 단회 경구독성시험

정희경,강은희,챵즐치앙,홍주헌,김상달,박병권,윤효인,박승춘,Jung, Hee-Kyoung,Kang, Eun-Hee,Chang, Zhi-Qiang,Hong, Joo-Heon,Kim, Sang-Dal,Park, Byung-Kwon,Yun, Hyo-In,Park, Seung-Chun 대한수의학회 2007 大韓獸醫學會誌 Vol.47 No.4

This study was conducted to investigate the pathogenicity of Paenibacillus (R) polymyxa JB 115 and single oral dose toxicity of culture broth containing (${\beta}$-glucan (CBG-JB 115) produced from P. polymyxa JB 115 in Sprague-Dawely rats of both sexes for 14 days. After oral administration of P. polymyxa JB 115 into rats, we could not find any abnormal clinical signs and variation in the body weight and temperature as compared with control group. We also investigated the acute toxicity of CBG-JB 115. As the results, there were no clinical signs and variance in the body weight and temperature related with CBG-JB 115 in comparison with the control group. From the this experiment, we could not find out any significant pathogenicity and toxicity induced by P. polymyxa JB 115 or by CBG-JB 115. Results of this study demonstrated that consumption of P. polymyxa JB 115 and its culture broth containing (${\beta}$-glucan was not associated with any obvious signs of toxicity in Sprague-Dawely rats even following consumption of large quantities.

그룹웨어를 위한 그룹통신 플랫폼의 설계 및 구현

정희경(Hoekyung Jung),최경호(Kyungho Choi),이수연(Sooyoun Lee) 한국정보과학회 1995 정보과학회 컴퓨팅의 실제 논문지 Vol.1 No.1

본 논문에서는 네트워크상에 분산되어 있는 다수 사용자들간에 컴퓨터의 도움을 받아 공동 작업을 수행하는 그룹웨어를 위한 그룹 통신 플랫폼을 설계, 구현하였다. 공동 작업을 수행하는 참석자들간에 사용되는 공유객체의 일관성 유지를 위한 멀티캐스팅 기능을 제공하기 위하여, ITU-TSS T.MCS모델에 기본한 중앙집중형 방식을 채택하였다. 이에 필요한 서비스 요구 사항을 분석하고, 통신 프리미티브를 정의하였으며, 사용자 응용 클라이언트와 서버간에 처리되는 IDU(Interface Data Unit)와 프로세스간 통신 모델을 설계하였다. 참석자 관리 모듈을 설계하여, 사용자에게 분산환경에 투명한 사용자 인터페이스를 제공하고, 불필요한 통신을 제거하였으며, 동적으로 변화하는 참석자들을 관리하도록 하였다. 이를 위한 프로세스 테이블, 프로세스 그룹 테이블, 호스트 그룹 테이블을 설계하였다. 이를 실제 그룹 통신 플랫폼을 이용한 화일 전송 응용을 통하여 시험하였으며, 이를 위한 화일 전송 프로토콜을 설계, 구현하였다. This paper describes an design and implementation of a group communication platform capable of cooperative works between users in distributed environment. A centralized model based on ITU-TSS T.MCS(Multicast Communication Service) model has been adopted to provide multicasting service while maintaining the consistency of shared(common) objects used in cooperative working environment. In order to design an interprocess communication model and IDU(Interface Data Unit) intervened between user application client and server, service requirements have been analyzed and communication primitives have been designed. Participants management module containing Process table, Process group table and Host group table has been designed not only to effectively manage dynamically-varing-participants but also to eliminate unnecessary communications while providing an user friendly interface transparant to distributed environments. File transfer protocol has been designed and implemented to verify results of this study in file transfer application.

항공사 SNS의 특성이 SNS신뢰, SNS참여의도에 미치는 영향에 대한 연구 : 항공사 유형의 조절효과를 중심으로

정희경(Jung, Hee-Kyoung),이경식(Lee, Kyung Sik) 한국호텔외식관광경영학회 2020 호텔경영학연구 Vol.29 No.5