• Food Science of Animal Resources
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• v.28 no.1
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• pp.63-68
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• 2008

To develop the somatic cell counting NIR Spectrum method within a range of 400-2500 nm, eosin-Y, methyl red, methylene blue, resazurin and amido black 10B were tested at 0.01% in raw milk. The PLS (Partial Least Square) results are summarized as follows: Correlation coefficients of the calibration model measurements by NIR spectroscopy in raw milk for eosin-Y, methyl red, methylene blue, resazurin and amido black 10B were 0.78, 0.65, 0.63, 0.65, 0.98 and 0.99, respectively. The correlation coefficients of the prediction model measurements by NIR spectroscopy in raw milk for eosin-Y, methyl red, methylene blue, resazurin and amido black 10B were 0.49, 0.21, 0.36, 0.47, 0.95 and 0.98 respectively. Based on these results, amido black 10B was the best additive for the NIRS somatic cell count method.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.350-350
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• 2011

ZnO는 II-VI족 화합물 반도체로서 3.37 ev의 band gap energy와 60 mv의 exciton binding energy를 가지며 차세대 소자로 다양한 분야에서 연구되어지고 있다. ZnO 박막과는 다르게 ZnO nano structure는 효율성과 특성 향상의 이점으로 태양전지와 투명전극 소자에 많은 연구가 되고 있으며 UV 레이저, 가스센서, LED, 압전소자, Field Emitting Transistor (FET) 등 다양한 응용분야에서 연구되고 있다. 본 연구에서는 유리 기판 위에 RF Magnetron sputtering법을 이용해 ZnO buffer layer를 다양한 두께(~1,000${\AA}$)로 증착한 뒤, Zn powder (99.99%)를 지름 2inch 석영관 안에 넣어 Thermal furnace장비를 이용하여 Thermal Evaporation법으로 약 500$^{\circ}C$에서 30분 동안 촉매 없이 성장 하였다. 수직성장된 ZnO 나노 구조체의 특성을 전계방출주사전자현미경(SEM), X-선 회절패턴(XRD), UV-spectra를 이용하여 분석하였다. SEM 분석을 통하여 ZnO buffer layer위에 성장된 ZnO 나노 구조체는 직경이 약 ~50 nm, 길이가 ~2 um까지 성장을 보였으며, XRD 측정결과, ZnO 우선 성장 방향(002)을 확인하였다. 두 가지 측정을 통하여 ZnO buffer layer의 유무에 따라 성장 특성이 향상되었음을 확인하였으며, 이는 buffer layer가 seed 역할을 한 것으로 사료된다. UV-spectra 측정을 통하여 가시광 영역(400~780 nm)에서 60%대의 투과도를 보여 가시광 영역에서 투명성을 요구하는 전자 소자 및 광소자 등에 적용 가능성을 확인하였다. 이 연구를 통하여 우수한 투과도를 가지며 유리 기판위에 수직성장된 ZnO 나노구조체는 태양전지와 플렉서블 디스플레이 등 다양한 활용 분야를 제시할 수 있다.

• Korean Journal of Materials Research
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• v.25 no.4
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• pp.165-170
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• 2015

Ceramics biomaterials are useful as implant materials in orthopedic surgery. In this study, porous HA(hydroxyapatite)/${\beta}$-TCP(tricalcium phosphate) composite biomaterials were successfully fabricated using HA/${\beta}$-TCP powders with 10-30 wt% $NH_4HCO_3$ as a space holder(SH) and $TiH_2$ as a foaming agent, and MgO powder as a binder. The HA/${\beta}$-TCP powders were consolidated by spark plasma sintering(SPS) process at $1000^{\circ}C$ under 20 MPa conditions. The effect of SH content on the pore size and distribution of the HA/${\beta}$-TCP composite was observed by scanning electron microscopy(SEM) and a microfocus X-ray computer tomography system(SMX-225CT). These microstructure observations revealed that the volume fraction of the pores increased with increasing SH content. The pore size of the HA/${\beta}$-TCP composites is about $400-500{\mu}m$. The relative density of the porous HA/${\beta}$-TCP composite increased with decreasing SH content. The porous HA/${\beta}$-TCP composite fabricated with 30%SH exhibited an elastic modulus similar to that of cortical bone; however, the compression strength of this composite is higher than that of cortical bone.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2005.10a
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• pp.429-435
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• 2005

This study attempts to develop indices in order to make an objective and effective evaluation of achievements in the first stage of operation of the Rural Village Development Project(RVDP) (the first 3 years of its operation). The results are as follows 1. Evaluation purposes are expansion of income-generating bases, improvement of living environments, strengthening of village's competence and establishment of an effective project's management system. 2. Evaluation items for the first three evaluation purposes, which are income-generating bases, improvement of living environments and strengthening of village's competence, are record of performance and substantiality in project's operation, results from operation, and capability in managing the project. Those for establishment of an effective project's management system are participation of habitants and the projects's management system. 3. As this study aims to develop the indices which can evaluate the state of operation in the interim of the project's operation and outcomes generated by then, the evaluation indices are selected by considering those criterions of representativeness, accessibility, usefulness and reliability. 4. As the indices developed in this study efficiency evaluate the process of project's operation and thus evaluate basically the project's operation on the basis of its efficiency. But, considering the purposes of the RVDP, it is included for the overall project's management system and plans for managing activities of the project to be evaluated on the basis of effectiveness.

• Current Photovoltaic Research
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• v.3 no.3
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• pp.80-84
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• 2015

We suggest new emitter formation method using solid-phase epitaxy (SPE); solid-phase epitaxy emitter (SEE). This method expect simplification and cost reduction of process compared with furnace process (POCl3 or BBr3). The solid-phase epitaxy emitter (SEE) deposited a-Si:H layer by radio-frequency plasma-enhanced chemical vapor deposition (RF-PECVD) on substrate (c-Si), then thin layer growth solid-phase epitaxy (SPE) using rapid thermal process (RTP). This is possible in various emitter profile formation through dopant gas ($PH_3$) control at deposited a-Si:H layer. We fabricated solar cell to apply solid-phase epitaxy emitter (SEE). Its performance have an effect on crystallinity of phase transition layer (a-Si to c-Si). We confirmed crystallinity of this with a-Si:H layer thickness and annealing temperature by using raman spectroscopy, spectroscopic ellipsometry and transmission electron microscope. The crystallinity is excellent as the thickness of a-Si layer is thin (~50 nm) and annealing temperature is high (<$900^{\circ}C$). We fabricated a 16.7% solid-phase epitaxy emitter (SEE) cell. We anticipate its performance improvement applying thin tunnel oxide (<2nm).

• Journal of Korean society of Dental Hygiene
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• v.12 no.4
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• pp.647-654
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• 2012

Objectives : To propose the data for prevention of oral health problems through assessment on the knowledge, cognition and practice about oral health care of the clients who visit dental clinics. Methods : The subjects were total 400 clients from the four dental clinics in Busan city. Their knowledge, cognition and performances about oral healthcare collected with questionnaire survey from February to March, 2011. The rate and mean compared by chi-square test, t-test, and ANOVA. Results : Mean level of their knowledge, recognition and practice were 72.5, 80.2, and 65.6, respectively. Theses levels were higher in women (p<0.01), in the group of higher interested (p<0.001), immediately treated (p<0.001), correct tooth brushing (p<0.05), toothbrushing educated (p<0.001), take regular scaling (p<0.001), use assistant hygiene items (p<0.001), instead no differences by age and education level. And, the rate of correct toothbrushing was higher as 1.24 (1.03~1.50) times in the group with higher knowledge level, the rate of immediate treatment and regular scaling were higher as 1.35 (1.07~1.70) times, and 2.26 (1.41~3.64) times in the group with higher recognition level, respectively. Conclusions : These results demonstrate that insufficient knowledge and recognition of oral health care are related to a lack of its practice. Though their primary goal of the visits was treatment, the clients' attention needed to raise the comprehensive knowledge and recognition levels for their oral health promotion, especially reach to the performance level rather than simple knowledge acquisition. And more, to achieve the efficient oral health promotion, the importance of early treatment and strengthened efforts for prevention should be emphasized.

• Korean Journal of Head & Neck Oncology
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• v.24 no.2
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• pp.155-161
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• 2008

Head and neck squamous cell carcinoma(HNSCC) still has poor outcome, and laryngeal cancer is the most frequent subtype of HNSCC. Therefore, there is a need to develop novel treatments to improve the outcome of patients with HNSCC. It is critical to gain further understanding on the molecular and chromosomal alteration of HNSCC to identify novel therapeutic targets but genetic etiology of squamous cell carcinoma of the larynx is so complex that target genes have not yet been clearly identified. Array based CGH(array-CGH) allows investigation of general changes in target oncogenes and tumor suppressor genes, which should, in turn, lead to a better understanding of the cancer process. In this study, We used genomic wide array-CGH in tissue specimens to map genomic alterations found in laryngeal squamous cell carcinomas. As results, gains of MAP2, EPHA3, EVI1, LOC389174, NAALADL2, USP47, CTDP1, MASP1, AHRR, and KCNQ5, with losses of SRRM1L, ANKRD19, FLJ39303, ZNF141, DSCAM, GPR27, PROK2, ARPP-21, and B3GAT1 were observed frequently in laryngeal squamous cell carcinoma tissue specimens. These data about the patterns of genomic alterations could be a basic step for understanding more detailed genetic events in the carcinogenesis and also provide information for diagnosis and treatment in laryngeal squamous cell carcinoma. The high resolution of array-CGH combined with human genome database would give a chance to find out possible target genes which were gained or lost clones.

• Health Policy and Management
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• v.18 no.3
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• pp.41-57
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• 2008

To examine the gap between physician's perceived importance and performance of care and to identify factors associated with the gap. A self-administered questionnaire survey was conducted with 91 physicians working in a University hospital in Seoul. The respondents were asked about their perceived importance and actual performance of interpersonal care on a 5-point Likert-type scale, indicating a higher score as higher importance and performance. Interpersonal care was measured by questions modified from the Korean Standard Service Quality Index, which are grouped into 6 categories: basic services, extra services, reliability, courtesy, convenience, and tangibles. Multiple regression analysis was conducted to find out physician characteristics associated with the gap. All of the 6 interpersonal care categories showed lower performance than perceived importance. The respondents tended to have a worse performance than perceived importance as the number of patients per outpatient care session ($\beta$=-0.0204, p<0.05) and the need for customer satisfaction education increase ($\beta$=-0.2226, p<0.05). Female physicians ($\beta$=0.2336, p<0.05) and those with higher job satisfaction($\beta$=0.0096, p<0.05) showed a better performance than perception. Overall, it appears that lower quality of interpersonal care was delivered to patients than the desired level considered by the responding physicians. Based on the regression analysis results, it is suggested that reducing patient volume per session, fulfilling education need for customer satisfaction, and improving job satisfaction may contribute to reduce the gap between physician's perceived importance and performance of interpersonal care.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.1
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• pp.107-114
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• 2011

Today the company adopts to use information management method at the network base such as internet, intranet and so on for the speed of business. Therefore the security of information asset protection and continuity of business within company in relation to this is directly connected to the credibility of the company. This paper secures continuity to the certified users using queuing model for the business interruption issue caused by DDoS attack which is faced seriously today. To do this I have reflected overloaded traffic improvement process to the queuing model through the analysis of related traffic information and packet when there occurs DDoS attack with worm/virus. And through experiment I compared and analyzed traffic loading improvement for general network equipment.

• Journal of Pharmacopuncture
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• v.6 no.3
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• pp.75-80
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• 2003

Lumbar spinal stenosis results from the progressive combined narrowing of the central spinal canal, the neurorecesses, and the neuroforaminal canals. In the absence of prior surgery, tumor, or infection, the spinal canal may become narrowed by bulging or protrusion of the intervertebral disc annulus, herniation of the nucleus pulposis posteriorly, thickening of the posterior longitudinal ligament, hypertrophy of the ligamentum flavum, epidural fat deposition, spondylosis of the intervertebral disc margins, or a combination of two or more of the above factors. Patients with spinal stenosis become symptomatic when pain, motor weakness, paresthesia, or other neurologic compromise causes distress. In one case, we administrated oriental medical treatment with acupuncture treatment and herb-medicine. Oriental medical treatment showed desirable effect on lumbar spinal stenosis.