• 한국산학기술학회논문지
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• 제19권9호
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• pp.50-61
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• 2018

방위력개선사업의 선행연구는 소요가 결정된 무기체계의 효율적인 획득방법 결정을 지원하기 위해 사업초기 단계에 수행되고 있다. 사업 초기단계의 선행연구는 그 중요성이 간과되어 소홀히 진행되어 왔으며, 이로 인한 성능 미충족 및 비용증가 등의 사업추진간 문제점이 지속적으로 발생되고 있다. 제한된 시간내 많은 항목의 선행연구를 수행한 결과, 핵심검토항목을 깊이 있게 검토하지 못함으로써 사업추진간 예상되는 위험을 식별하고 감소시키는 역할을 제대로 수행하지 못하고 있다. 따라서, 본 논문에서는 방위력개선사업 선행연구 단계에서 수행시 고려해야 할 핵심요소들을 식별하기 위해 시스템안전 분석과정에서 사용되고 있는 FTA/FMEA 기법의 활용에 대해 연구하였다. 구체적으로 수행방안 도출시 FTA/FMEA 기법의 적용에 대한 착안점 및 주어진 조건에 부응하도록 개선을 통해 핵심검토 항목 도출을 위한 방법론을 구축하였다. 본 연구의 결과를 토대로 방위력개선사업 선행 연구단계에서 핵심 수행요소 재정립을 통해 향후 방위력 개선사업의 사업관리 측면에서 발생할 수 있는 불필요성 및 예상되는 위험을 제거함에 따라, 비용 및 시간을 절감하고 위험감소를 통한 사업의 안정적 추진을 기대할 수 있을 것으로 기대된다.

• 유통과학연구
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• 제13권5호
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• pp.53-60
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• 2015

Purpose - The purpose of this paper is to shed light on the importance of the slope and curvature of the volatility curve implied in option prices in the KOSPI 200 options index. A number of studies examine the implied volatility curve, however, these usually focus on cross-sectional characteristics such as the volatility smile. Contrary to previous studies, we focus on time-series characteristics; we investigate correlation dynamics among slope, curvature, and level of the implied volatility curve to capture market information embodied therein. Our study may provide useful implications for investors to utilize current market expectations in managing portfolios dynamically and efficiently. Research design, data, and methodology - For our empirical purpose, we gathered daily KOSPI200 index option prices executed at 2:50 pm in the Korean Exchange distribution market during the period of January 2, 2004 and January 31, 2012. In order to measure slope and curvature of the volatility curve, we use approximated delta distance; the slope is defined as the difference of implied volatilities between 15 delta call options and 15 delta put options; the curvature is defined as the difference between out-of-the-money (OTM) options and at-the-money (ATM) options. We use generalized method of moments (GMM) and the seemingly unrelated regression (SUR) method to verify correlations among level, slope, and curvature of the implied volatility curve with statistical support. Results - We find that slope as well as curvature is positively correlated with volatility level, implying that put option prices increase in a downward market. Further, we find that curvature and slope are positively correlated; however, the relation is weakened at deep moneyness. The results lead us to examine whether slope decreases monotonically as the delta increases, and it is verified with statistical significance that the deeper the moneyness, the lower the slope. It enables us to infer that when volatility surges above a certain level due to any tail risk, investors would rather take long positions in OTM call options, expecting market recovery in the near future. Conclusions - Our results are the evidence of the investor's increasing hedging demand for put options when downside market risks are expected. Adding to this, the slope and curvature of the volatility curve may provide important information regarding the timing of market recovery from a nosedive. For financial product distributors, using the dynamic relation among the three key indicators of the implied volatility curve might be helpful in enhancing profit and gaining trust and loyalty. However, it should be noted that our implications are limited since we do not provide rigorous evidence for the predictability power of volatility curves. Meaning, we need to verify whether the slope and curvature of the volatility curve have statistical significance in predicting the market trough. As one of the verifications, for instance, the performance of trading strategy based on information of slope and curvature could be tested. We reserve this for the future research.

• 유통과학연구
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• 제11권10호
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• pp.5-15
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• 2013

Purpose - With the increase in fervor to purchase luxury brands, new social problems have arisen, such as excessive preoccupation with luxury brands and high preference for forged luxury goods. Therefore, the issues related to luxury brands, termed "Luxury Syndrome," have emerged as an area of great interest for researchers and practitioners. However, previous studies neglect to categorize this preference for luxury brands. Therefore, this study aims to identify the different purchasing behaviors of consumers using the types of luxury brands preferences as parameters. Research design, data, and methodology - This study arranges a causal relationship model assuming that purchase behaviors positively (+) affect typified preference for luxury brands and purchase intentions. We administered a questionnaire survey to the purchasers who bought luxury brands from department stores to secure additional data necessary to verify the hypotheses in this study. We then processed the data using SPSS 19.0. We further analyzed the basic data using frequency and descriptive statistical analysis, and verified the measurement tools through feasibility and reliability analyses. Moreover, this study uses multiple regression analysis to verify the hypotheses. Further, this study tests the path effect between luxury brand purchase attitude and purchase behavior, with non-intrinsic preference and intrinsic preference as the mediating variables. Results - Based on the results, the impact of tendencies of conspicuous consumption and self-monitoring on non-intrinsic preference was significantly positive (+), while the impact of tendencies of pursuit of a reference group, conspicuous consumption, and self-monitoring on intrinsic preference and purchase intentions was significantly positive (+). Further, non-intrinsic and intrinsic preferences positively (+) influence purchase intentions and the impact of non-intrinsic preference took an absolute portion. However, the tendency of dependence on brands negatively (-) impacts purchase intentions. The results showed that self-monitoring and conspicuous consumption tendencies have greater effect on purchase intention, which is mediated by non-intrinsic preference. In contrast, reference group following tendency has a greater effect on purchase intention, which is mediated by intrinsic preference. Conclusions - Based on the results, the study verifies that the consumption of luxury brands in Korea has not yet entered the settling period. The tendency for conspicuous consumption and the tendency for pursuit of the reference group were relatively important aspects for the consumers who prefer luxury brands non-intrinsically and intrinsically, respectively. Especially, it was found that the purchase intentions for forged brands originate from the tendency to depend on brands. Based on these findings, this study suggests the measures to develop and mature the luxury brands market, and reinforce marketing performance at the three levels, that is, government, distributors, and manufacturers. The luxury brands manufacturers should devote themselves to the production and design of products to catch the attention of mature consumers of luxury brands. The luxury brands distributors should then raise the level of Customer Relationship Management (CRM) for opinion leaders. Finally, the Government should prepare effective policies for the development of luxury brands and provide a variety of economic support.

• 한국콘텐츠학회논문지
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• 제8권5호
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• pp.246-259
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• 2008

본 연구에서는 육군 지상전술 C4I체계(ATCIS)가 전방 군단별로 구축 초기단계에 있어, 체계의 불안정과 운영의 비효율 등 문제점이 도출됨에 따라 시행착오를 최소화하고 경제성과 효과성을 검증하기 위해 문헌적 연구와 더불어 각국의 체계와 특성을 살펴보았으며, 실제 현장에서 자료수집과 더불어 공통성, 적시성, 경량화 및 단순화, 자동성, 야전 및 생존성, 다단계 보안 및 상호 운용성, 통합성과 국방 표준화 등 운용자 요구수준을 설문 자료를 수집하여 실증적인 분석과 검증을 통해 상호 상관관계를 살펴보았다. 검증결과 체계의 규격 및 운용예규, 기동성 및 보안성, 전장환경 적응성, 체계 지원 및 관리가 잘되어야만 체계운용에 대한 신뢰도가 확보됨과 동시, 체계에 대한 운용요구가 높고, 또한 체계운용 관련하여 지속적인 교육훈련과 체계정비 및 보완소요가 적어야 C4I체계가 잘 운용된다는 것을 알 수 있었다. 따라서 발전 방안은 체계에 대한 지속적인 운용자 교육과 정비시스템의 구축, IT와 네트워크를 결합한 한국적인 특성을 살린 한 단계 발전된 디지털화(C4ISR+D)화와 더불어 향후 운용자 측면의 성과측정 모델의 시스템 개발을 통해 지속적으로 보완 발전시켜야 한다는 사실을 확인할 수 있었다.

• 기술혁신학회지
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• 제18권2호
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• pp.233-263
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• 2015

본 연구는 지역산업 경쟁력 제고를 위한 육성정책의 핵심인 지역산업 R&D의 육성전략 및 성과에 대한 실증분석을 통해 문제점을 도출하고 R&D 투자 효율성을 증대하기 위한 연구이다. 우리나라 지역산업은 2000년대에 접어들어 국가균형발전정책과 더불어 본격적으로 전개되기 시작하여 산업통상자원부를 중심으로 한 다양한 지역산업 육성정책이 추진되었으며 현재는 비수도권 14개 시도의 산업경제를 선도하는 핵심 사업으로 자리매김하고 있다. 지역산업 육성정책 중 핵심 프로그램인 R&D지원의 경우 규모가 지속적으로 확대되고 있으며 산업경쟁력 확보를 목적으로 범 부처 청 및 광역지자체별로 자체적인 지원사업들에 대한 지원을 더욱 강화하고 있다. 본 연구에서는 지역산업정책 중 가장 큰 비중을 차지하고 있는 핵심사업인 지역산업 R&D에 대한 국가 R&D정책, 부처 청 및 지역자체의 R&D정책, R&D전략, 사업 추진현황, 성과 등에 대해 특정지역(전북)의 실증분석을 통해 문제점을 도출하고 성과창출 확대를 위한 개선방안을 제안하고자 한다. 또한 제안된 개선방안을 통해 부처 청 단위의 국가 R&D, 지자체 R&D 등에서 산발적으로 지원되고 있는 R&D의 중복성 최소화 및 지원주체별 협력방안을 제시하여 지역산업 R&D투자의 전략성과 효율성을 강화함으로써 궁극적으로 지역의 산업육성 성과창출을 극대화하는데 기여할 것으로 기대된다.

• 한국통신학회논문지
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• 제31권10A호
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• pp.1003-1013
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• 2006

IEEE802.11g VoWLAN (Voice over Wireless LAN) 단말기는 802.11b 전용 단말기에 비해 통화시간이 30 % 이상 감소하는 문제점이 있어 통화시간이 문제로 대두되고 있다. 일반적으로, 802.11g에서는 멀티캐리어 방식인 OFDM (Orthogonal Frequency Division Multiplexing) 변조방식을 사용하여 54 Mbps속도로 전송하기 때문에 기존의 802.11b MAC (Medium Access Control) 전송방식과 비교하여 통화시간을 만족시키는 것이 어렵다. 본 논문에서는 802.11g 규격을 적용한 단말기에서 통화중 Power Save 방법으로 Holdover Time을 처음으로 제안하므로 통화시간을 만족시킨다. 다만, 통화 단말기 수 증가에 따른 네트워크 혼잡으로 경합 창 (contention window)이 많이 발생하여, Back-off 수 증가로 인한 통화품질(QoS)의 문제가 발생하지만, QoS 해결 방안으로 다운 링크 시 802.11 G.711 Sequence Number를 단말기 MAC 단에서 분석하여 손실율에 따른 Holdover Time을 가변 하는 방법을 제안하므로 이 문제를 해결한다. 802.11b/g 소비전류 분석과 통화 단말기 증가에 따른 네트워크 혼잡에 의한 MAC 파라미터 성능을 분석하며, VQT장비와AiroPeek를 이용하여 실제적인 데이터를 분석한다.

• 대한기계학회논문집B
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• 제38권9호
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• pp.739-745
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• 2014

심장 질환 환자에게 약물 치료를 시행하고 있으나, 통상의 약물 치료만으로는 심장질환을 치료하기에는 부족하다. 그러나 LVAD 를 이식한다면 심장기능을 보조하여 심장 이식까지의 가교 역할로서 효과가 있다고 보고되고 있다. 본 연구에서는 선행 연구로 개발된 곡관형 LVAD 인 LibraHeart-I(LH-1)을 이용하여, 대동물(Bovine model, Holstein)과 소동물(canine model, Labrador-retriever)을 대상으로 장기간 동물실험 및 응급상황에서의 생체적합성을 평가하고자 한다. 대동물을 대상으로 실시한 장기간의 동물 실험에서 49 일 생존하였으며, 실험기간 동안 실시한 혈액 검사 및 생징후에서 특이 소견을 관찰되지 않았다. 소동물을 대상으로 한 단기간의 동물 실험에서는 외부 구동부의 동력 지원 없이도 LH-I 내에 혈액이 머무르지 않는 것으로 관찰되었다. 본 연구에서는 장기간 동물실험 및 응급상황에서의 박출 성능을 통해 선행 연구로 개발된 LH-I의 생체적합성을 검증하였다.

• Journal of Preventive Medicine and Public Health
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• 제36권2호
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• pp.101-107
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• 2003

Objectives : Dementia has emerged as a leading public health problem in elderly persons, and its early detection is important for the treatment of curable cases, and in the educational support for other family members. Although dementia screening tests are available, they have not gained widespread use in community or primary care settings. Our goal was to validate the Tine and Change (T&C) Test, -including its validity and reliability in patients, and to assess it as a simple, standardized method for the screening of dementia in the rural elderly. Methods : The participants in this study comprised of 59 patients from an urban hospital and 405 persons from a rural community aged 65 years or older. The time test evaluated the understanding of clock hands indicating 11:10, and the change test the ability to make 1,000 Won from a group of coins, consisting of one 500, seven 100, and seven 50 Won coins. The T&C ratings were validated against a reference standard based on the physician's diagnosis of the patients. The convergent validity in relation to other cognitive measure, test-retest agreement, and inter-observer reliability were assessed. To assess the relationship between the Korean Mini-Mental State Exam (K-MMSE) and the T&C Test, the mean K-MMSE scores were compared with the results of the T&C Test in the elderly from a rural community. Results The T&C Test had a sensitivity and specificity of 73.0, and 90.9%, and positive and negative predictive values of 93.1, and 66.7%, respectively. The test-retest and inter-observer agreement rates were both 95%. The K-MMSE scores and T&C Test were significantly related in the elderly from a rural community (p<0.01), The T&C Test was not influenced by the educational status. The Time and Change Tests took a mean of 6.3 and 12.7 seconds, respectively, to complete Conclusion : The T&C Test is a simple, accurate and reliable, performance-based tool in the screening for dementia. Because it is quick, and easy-to-use, it is hoped the T&C Test will be used for the widespread cognitive screening of aging populations.

• 대한예방한의학회지
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• 제21권3호
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• pp.11-18
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• 2017

Objectives : In an effort to suggest a developmental plan of Traditional Korean Medicine health promotion project(TKM-HPP), this study was conducted to identify the problems experienced by public health Traditional Korean Medicine(PH-TKM) doctors in duty and to analyze successful cases of the health promotion project. Methods : Two PH-TKM doctors in duty at the Public Health Centre branch and Public Health Centre respectively, and one TKM doctor in charge of Public Health Centre participated in the in-depth interview. The research procedure was as follows; 1) inform study objectives and interview questions to participants, 2) in-depth interview with semi-structured questions, and 3) post-confirmation and verification. The interview was recorded and transcripted. In-depth interview was composed of 6 subsections: 1) Introducing participants and share purpose of interview, 2) Confirmation of the job status and difficulty of public health centre, 3) Reflecting and sharing experiences of public health clinic job performance cases, 4) Current status and improvement needs of TKM-HPP, 5) Discussions on improvement of TKM-HPP in public health center, 6) Sharing and reconfirmation of interview results. Thematic analysis was conducted from the narratives. Results : The study showed that; 1) the support from the local government was critical for the successful TKM-HPP and participation of the PH-TKMs; 2) the major problems experienced by PH-TKMs were lack of training for TKM-HPP in the field and lack of knowledge at local government level; 3) the suggestions to provide PH-TKMs with manual to educate residents effectively and redefine roles of PH-TKMs in the project. It also suggests that TKM-HPP model should be developed by the district in a way of reflecting regional characteristics. Conclusions : Firstly, more efforts should be made on the projects rather than medical treatment in public health centers, except for areas where medical institutions are scarce. Secondly, in order to facilitate participation of PH-TKM doctors, each local office should reduce medical care and increase efforts related with projects. Thirdly, the institution has to develop feasible TKM-HPP plans that can be carried out by PH-TKMs by the manual. Lastly, pre-training should be provided to PH-TKMs to understand contents of TKM-HPP related to public health centre work before the placement.

• 한국독성학회:학술대회논문집
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• 한국독성학회 2006년도 추계학술대회
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• pp.65-74
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• 2006

Modem drug discovery requires rapid pharmacokinetic evaluation of chemically diverse compounds for early candidate selection. This demands the development of analytical methods that offer high-throughput of samples. Naturally, liquid chromatography / tandem mass spectrometry (LC-MS/MS) is choice of the analytical method because of its superior sensitivity and selectivity. As a result of the short analysis time(typically 3-5min) by LC-MS/MS, sample preparation has become the rate- determining step in the whole analytical cycle. Consequently tremendous efforts are being made to speed up and automate this step. In a typical automated 96-well SPE(solid-phase extraction) procedure, plasma samples are transferred to the 96-well SPE plate, internal standard and aqueous buffer solutions are added and then vacuum is applied using the robotic liquid handling system. It takes only 20-90 min to process 96 samples by automated SPE and the analyst is physically occupied for only approximately 10 min. Recently, the ultra-high flow rate liquid chromatography (turbulent-flow chromatography)has sparked a huge interest for rapid and direct quantitation of drugs in plasma. There is no sample preparation except for sample aliquotting, internal standard addition and centrifugation. This type of analysis is achieved by using a small diameter column with a large particle size(30-5O ${\mu}$m) and a high flow rate, typically between 3-5 ml/min. Silica-based monolithic HPLC columns contain a novel chromatographic support in which the traditional particulate packing has been replaced with a single, continuous network (monolith) of pcrous silica. The main advantage of such a network is decreased backpressure due to macropores (2 ${\mu}$m) throughout the network. This allows high flow rates, and hence fast analyses that are unattainable with traditional particulate columns. The reduction of particle diameter in HPLC results in increased column efficiency. use of small particles (<2 urn), however, requires p.essu.es beyond the traditional 6,000 psi of conventional pumping devices. Instrumental development in recent years has resulted in pumping devices capable of handling the requirements of columns packed with small particles. The staggered parallel HPLC system consists of four fully independent binary HPLC pumps, a modified auto sampler, and a series of switching and selector valves all controlled by a single computer program. The system improves sample throughput without sacrificing chromatographic separation or data quality. Sample throughput can be increased nearly four-fold without requiring significant changes in current analytical procedures. The process of Bioanalytical Method Validation is required by the FDA to assess and verify the performance of a chronlatographic method prior to its application in sample analysis. The validation should address the selectivity, linearity, accuracy, precision and stability of the method. This presentation will provide all overview of the work required to accomplish a full validation and show how a chromatographic method is suitable for toxirokinetic sample analysis. A liquid chromatography/tandem mass spectrometry (LC-MS/MS) method developed to quantitate drug levels in dog plasma will be used as an example of tile process.