건조 타조육의 품질변화에 미치는 수분함량의 영향

이석원,강창수 高麗大學校 倂設 保健大學 保健科學硏究所 2001 保健科學論集 Vol.27 No.1

The objective of this study was to investigate the influence of moisture content on the physicochemical properties of the dried ostrich meat. The influence of moisture content was analyzed by measuring texture properties, Hunter color value, pH, water activity, content of soluble protein, and sensory evaluation. The dried ostrich meats were prepared at 60℃ using a hot-wind dryer, and it was packed by vacuum packaging machinery. Tensile strength of sample increased as the moisture content was decreased from 20% to 12%, and the value of it was 60.6 N, 93.2 N and 130.8 N, respectively. This trend also appeared similarly In puncture force of the samples. The dried ostrich meat had the highest lightness, redness, and yellowness at 16% of moisture content. The soluble protein of the samples was appeared a decreasing trend with the drying time, but the pH did not changed. It indicated that the moisture content did not affect the pH of dried ostrich meat. And Water activity of the samples had a value below 0.62 in all the samples tested. It means that the most of microorganism cannot grow in the dried ostrich meat. The sample with 16% of moisture content had prominent sensory properties. The moisture content had a great influence on the quality of dried ostrich meat. Overall, the dried ostrich meat containing 16% of moisture content was rated most desirable among the three-moisture content.

推論과 證明指導에 관한 考察

김종구,임석훈,설영수 경북대학교 과학교육연구소 1997 科學敎育硏究誌 Vol.21 No.-

This study is to discuss the educational problem about whether an exact proof is useful in the secondary school mathematics education formally in the development of mathematical thought and whether we should teach students an exact proof up to an extent.

지혈제 오염이 콤포머의 전단결합강도에 미치는 영향

허정무,곽주석,이황,이수종,임미경 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.2

One of this latest concepts in bonding are "total etch", in which both enamel and dentin are etched with an acid to remove the smear layers, and "wet dentin" in which the dentin is not dry but left moist before application of the bonding primer. Ideally, the application of a bonding agent to tooth structure should be insensitive to minor contamination from oral fluids. Clinically, contaminations such as saliva, gingival fluid, blood and handpiece lubricant are often encountered by dentists during cavity preparation. The aim of this study was to evaluate the effect of contamination by hemostatic agents on shear bond strength of compomer restorations. One hundred and ten extracted human maxillary and mandibular molar teeth were collected. The teeth were removed soft tissue remnant and debris and stored in physiologic solution until they were used. Small flat area on dentin of the buccal surface were wet ground serially with 400, 800 and 1200 abrasive papers on automatic polishing machine. The teeth were randomly divided into 11 groups. Each group was conditioned as follows: Group 1: Dentin surface was not etched and not contaminated by hemostatic agents. Group 2: Dentin surface was not etched but was contaminated by Astringedent® (Ultradent product Inc., Utah, U.S.A.). Group 3: Dentin surface was not etched but was contaminated by Bosmin®(Jeil Pharm, Korea).). Group 4: Dentin surface was not etched but was contaminated by Epri-dent®(Epr Industries, NJ, U.S.A.). Group 5: Dentin surface was etched and not contaminated by hemostatic agents. Group 6: Dentin surface was etched had contaminated by Astringedent®. Group 7: Dentin surface was etched and contaminated by Bosmin®. Group 8: Dentin surface was etched and contaminated by Epri-dent®. Group 9: Dentin surface was contaminated by Astringedent®. The contaminated surface was rinsed by water and dried by compressed air. Group 10: Dentin surface was contaminated by Bosmin®. The contaminated surface was rinsed by water and dried by compressed air. Group 11: Dentin surface was contaminated by Epri-dent®. The contaminated surface was rinsed by water and dried by compressed air. After surface conditioning. F2000® was applicated on the conditoned dentin surface. The teeth thermocycled in distilled water at 5℃ and 55℃ for 1,000 cycles. The samples were placed on the binder with the bonded compomer-dentin interface paralled to the knife-edge shearing rod of the Universal Testing Machine(Zwick Z020, Zwick Co., Germany) running at a cross head speed of 1.0mm/min. Group 2 showed significant decrease in shear bond strength compared with group 1 and group 6 showed significant decrease in shear bond strength compared with group 5. There were no significant differences in shear bond strength between group 5 and group 9, 10 and 11.

감염근관에서 Black-Pigmented Bacteria의 동정에 대한 연구

권은경,김은숙,곽주석,이황,이수종,임미경 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.1

Black-pigmented bacteria have been implicated in the endodontic infections. This group of microorganisms includes Porphyromonass endodontalis, Porphyromonas gingicalis, Prevotella intermedia, and Prevotella nigresceus. The organisms display a wide variety of virulence factors that may be pertinent to acute endodontic infections. The aim of this study was to identify P.endodontalis, P.gingivalis, P.intermedia, and P.nigrescens by using special potency disk test, filter paper spot test, 16S rRNA gene-directed PCR, and API 32A. Microbial samples were collected from root canals of 33 intact teeth with necrotic pulp and/or apical periodontitis. Conventional laboratory methods were used for identification of the strains of black pigmented bacteria. Eighteen of 33 samples were positive for the growth of black-pigmented bacteria. Five colonies were cultured from each pure cultured colonies from Brucella agar plate. Seventy seven colonies were positive for the growth of black-pigmented bacteria. Thirty three of 77(42.6%) were identifed as P.nigrescens, 10 of 77(12.9%) were P.gingivalis, 6 of 77(7.8%) were P.endodontalis, 10 of 77(12.9%) were P.intermedia. On the contraty the reference strains of P.nigrescens, experimental strains of P.nigrescens was sensitive to kanamycin in special potency disk test. 16S rRNA gene PCR and API test after rapid presumptative identification methods. such as special potency disk test and filter paper spot test, would be accurate detection methods for black-pigmented bacteria.

고압 커패시터의 고장 분석을 통한 신뢰도 예측

양석준,김진우,신승우,이희진,신승훈,유동수,장석원 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.6

본 논문은 고압 커패시터의 고장분석과 신뢰성 예측 결과를 다루고 있다. 부품의 수명과 고장률을 예측하기 위해서 두 가지 방법으로 고장 모드와 고장 메커니즘을 연구하였다. 에폭시 수지로 성형된 고압 커패시터가 절연내압 시험 하에서 저항이 제로로 되는 고장에 대하여, 근본원인 고장분석 체계를 효과적으로 수립함으로써 고장 메커니즘의 원인을 분석하였다. 특히 세라믹-에폭시 계면에서의 절연파괴 고장 현상이 강조되었으며, 본 연구에서 얻어진 결과의 타당성은 마그네트론에 장착된 고압 커패시터의 열사이클 시험 수행에 의한 가속시험 결과로부터 입증되었다. 시험 결과들은 결함이 있는 로트를 신속히 규명하고 B10수명을 결정하는데 유용하게 사용할 수 있다. 또한, 유전체의 절연파괴에 대해서 부하-강도 간섭모델을 이용하여 고장률을 예측하였다. This paper presents a result of failure analysis and reliability evaluation for high voltage ceramic capacitors. The failure modes and failure mechanisms were studied in two ways in order to estimate component life and failure rate. The causes of failure mechanisms for zero resistance phenomena under withstanding voltage test in high voltage ceramic capacitors molded by epoxy resin were studied y establishing an effective root cause failure analysis. Particular emphasis was placed on breakdown phenomena at the ceramic-epoxy interface. The validity of the results in this study was confirmed by the results of accelerated testing. Thermal cycling test for high voltage ceramic capacitor mounted on a magnetron were implemented. Delamination between ceramic and epoxy, which might cause electrical short in underlying circuitry, can occur during curing or thermal cycle. The results can be conveniently used to quickly identify defective lots, determine B10 life estimation each lot at the level of inspection, and detect major changes in the vendors processes. Also, thd condition for dielectric breakdown was investigated for the estimation of failure rate with load-strength interference model.

Morphology and Optical Properties of ZnO Epitaxial Layers on Growth Interrupted Buffer Layers by Plasma-Assisted Molecular Beam Epitaxy

Su Min Jeon,Min Su Kim,Do Yeob Kim,Ghun Sik Kim,Min Young Cho,Hyun Young Choi,Kwang Gug Yim,Ji Hoon Kim,Jin Soo Kim,Gi-Seog Eom,Sung Dong Park,Eundo Kim,Myong Hyo Jung,Do-Weon Hwang,Jae-Young Leem 한국진공학회 2009 한국진공학회 학술발표회초록집 Vol.37 No.-

Initial Risk Assessment of Acetanilide with Respect to Ecological Integrity

Lee, Su-Rae,Choi, Seon-Ju,Lee, Mi-Kyung,Nam, U-Kyung,Chung, Sun-Hwa,Seog, Geum-Su,Park, Kwang-Sik,Kim, Kyun,Kim, Yong-Hwa 한국환경독성학회 2000 환경독성보건학회지 Vol.15 No.1

아세트아닐리드는 의약품과 염료의 합성과정에서 중간체로서 공기와 폐수를 통하여 환경 중에 방출 될 수 있다. 아세트아닐리드는 호기적 조건하에서 신속히 생분해되고 OH래디컬의 존재하에 간접적으로 광분해된다. 생물농축계수는 4.5로 추정되므로 수생생물에서의 생물농축은 낮을 것으로 예상된다. 아세트아닐리드에 관한 생태독성학적 데이터 조사결과 4종 어류에 대한 급성독성치만 보고되어 있으며, EUSES시스템에 의하면 어류에서의 최저 PNEC값 (예상 무작용농도)은 0.01㎎/l이고 표면수에서의 PEC값(예상 환경농도)은 지역수준에서 최악의 경우 9.1?0^(-5)㎎/l이다. 지역수준에서 표면수에 대한 아세트아닐리드의 RCR(위해성지수)은 9.1?0^(-3)으로 추정되어 어류에 대한 안전성을 충분하다. 그러나 국지 수준에서의 RCR은 물과 침적물에서 각각 1.3과 1.6이므로 제조공장 주변에서는 생태독성 위험이 존재할 것으로 추정된다. 아세트아닐리드의 환경위해성 평가를 보다 정확하기 하기 위해서는 물벼룩과 조류에 대한 급성독성 자료가 보완되어야 할 것이며, 따라서 이에 대한 실험이 진행되어야 할 것으로 사료된다. Acetanilide may be released into the environment through air and wastewater from its production and use sites as an intermediate in the synthesis of phar-maceuticals and dyes. Acetanilide is biodegraded rapidly under aerobic conditions and decomposed by indirect photolysis in the presence of OH radicals. An estimated bioconcentration factor of 4.5 suggests that bioaccumulation in aquatic organisms is low. Ecotoxicological data on acetanilide exist on acute toxicity to fishes of 4 species only. According to the EUSES system, the lowest PNEC (Predicted no effect concentration) in fishes is 0.01 mg/l and PEC (Predicted environmental concentration) for surface water on a regional scale is 9.1?0^(-5) mg/l as the worst case. RCR (Risk characterization ratio) of acetanilide for surface water on a regional scale was estimated as 9.1?0^(-3), which is safe enough C(=)or fishes. RCR on a local basis slightly exceeds the value I in water and sediment; that is, 1.3 and 1.6, respectively, which suggests the existence of ecotoxicological risk at the vicinity of the manufacturing site. For the refinement of environmental risk assessment on acetanilide, more data should be collected regarding prolonged fish toxicity, acute toxicity to ward daphnia and algae. It is, therefore, recommended that acetanilide should be a candidate for further work to supplement the lacking data until it is proved to be safe in the ecotoxicological aspects.

Risk factors for recurrence after therapeutic lateral neck dissection for primary papillary thyroid cancer.

Kim, Su-Jin,Park, Seog Yun,Lee, You Jin,Lee, Eun Kyung,Kim, Seok-Ki,Kim, Tae Hyun,Jung, Yu-Seog,Ryu, Junsun,Myong, Jun Pyo,Chung, Ki-Wook Raven Press 2014 Annals of Surgical Oncology Vol.21 No.6

<P>Lateral lymph node metastasis is an important prognostic factor and is predictive of tumor recurrence and cause-specific survival in patients with papillary thyroid cancer (PTC). However, the factors predicting recurrence and clinical outcomes after therapeutic lateral neck dissection are not well established. The aims of this study were to evaluate the incidence, pattern, and factors predictive of PTC recurrence after therapeutic lateral neck dissection.</P>

Initial Risk Assessment of Acetanilide with Respect to Human Health

Lee, Su-Rae,Choi, Seon-Ju,Lee, Mi-Kyung,Nam, U-Kyung,Chung, Sun-Hwa,Seog, Geum-Su,Park, Kwang-Sik,Kim, Kyun,Kim, Yong-Hwa 한국환경독성학회 2000 환경독성보건학회지 Vol.15 No.1

아세트아닐리드는 그의 생산 및 이용 공장에서 환경으로 방출된 다음 인체에 노출될 수 있다. 아세트 아닐리드는 진통효과를 나타내는 것으로 알려져 과도 노출시에는 건강에 부작용을 초래할 수 있다. EUSES시스템에 의하면 아세트아닐리드는 지역노출의 경우 6×10⁴을 초과하는 높은 MOS 값(안전성 마진)을 보여주어 공중보건상 충분히 안전한 것으로 나타났다. 국지수준(작업장)에서 경피노출에 의한 MOS 최저 값은 3×10⁴으로 추정되었지만 작업장에서 개인장비나 환기와 같은 예방조치에 의하여 그 위험을 부분적으로 경감시킬 수 있다. 아세트아닐리드는 분진 흡입하는 작업자에게 위험 가능성이 나타날 수 있다. 작업장에서 건강보호를 위해서는 산업보건 측면에서의 안전함이 증명될 수 있도록 반복투여독성, 생식독성 및 발육독성에 관한 자료가 보완되어야 할 것이며, 따라서 이에 대한 실험이 진행되어야 할 것으로 사료된다. Acetanilide may be released into the environment through air and wastewater from its production and use sites and exposed to human. Acetanilide is known to produce an analgesic effect and may pose adverse effects on human health by overly exposure. According to the EUSES system, acetanilide showed a high MOS (Margin of safety) value exceeding 6 × 10⁴ on a regional exposure, which is safe enough for public health. Whereas the lowest MOS value in dermal exposure was estimated as 3 x 10^(-4)on a local basis (workplace), the risk could be partly counteracted by taking preventive measures such as using mask and globes and good ventilation in the work places. Acetanilide may pose a potential risk for workers by dust inhalation. For the sake of health protection in the work places, additional data should be accumulated with respect to repeated dose toxicity, reproduction toxicity and developmental toxicity, etc. It is, therefore, re-commended that acetanilide should be a candidate for further work to supplement the lacking data until it is proved to be safe in the occupational health aspects.

포스터 발표 : 포스터 연제 ; 신이식 후 발생한 국소성 분절성 사구체경화증의 임상양상 및 이식신 생존률

윤수영 ( Yun Su Yeong ),홍성필 ( Hong Seong Pil ),김주성 ( Kim Ju Seong ),송영수 ( Song Yeong Su ),노현정 ( No Hyeon Jeong ),강신욱 ( Kang Sin Ug ),이호영 ( Lee Ho Yeong ),한대석 ( Han Dae Seog ),최규헌 ( Choe Gyu Heon ),정현주 ( 대한신장학회 2000 춘계학술대회 초록집 Vol.19 No.2