• The Korean Journal of Physiology and Pharmacology
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• 제1권1호
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• pp.79-82
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• 1997

The present study was aimed to explore an interaction between endothelium-derived nitric oxide (NO) and atrial natriuretic peptide (ANP) systems in normotensive and hypertensive states. Rats were made two-kidney, one clip (2K1C) hypertensive and supplemented with either $N^G-nitro-L-arginine$ methyl ester (L-NAME, 5 mg/100 ml drinking water) or L-arginine hydrochloride (400 mg/100 ml drinking water). One group supplied with normal tap water served as control. Sham-clipped rats were also divided into the L-NAME, L-arginine, and control groups. The plasma levels and atrial contents of ANP were determined at day 28 following clipping the renal artery. In 2K1C rats, the plasma level of ANP was higher and the atrial content was lower than in the sham-clipped control. L-Arginine increased the atrial content of ANP in association with a decreased plasma ANP, whereas L-NAME significantly affected neither parameter. The increase of blood pressure in 2K1C rats was not affected by L-arginine or L-NAME. In sham-clipped rats, the plasma level of ANP was significantly increased by L-NAME along with an increase in blood pressure. On the contrary, L-arginine did not affect the blood pressure or plasma ANP. The atrial content of ANP was significantly altered neither by L-arginine nor by L-NAME. These results suggest that NO plays a tonic inhibitory role on the ANP release with concomitant increases of the atrial tissue content. In addition, hypertension is suggested to modify the release and tissue storage of ANP.

• 한국농공학회논문집
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• 제59권4호
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• pp.53-64
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• 2017

The equations and emission factors for estimating national GHGs are developed based on IPCC guidelines. The GHGs on livestock sector has been calculated using methodologies following 1996 IPCC guideline in South Korea although 2006 IPCC guideline was announced in 2006. The purpose of this study is to understand the implications of guideline updates for national GHGs changes in the livestock sector and analyze the effect of regional major livestock characteristics using KOSTAT time series data (1990 ~ 2014). The results show a new guideline makes GHGs reduce in the livestock sector up to 11 % with subdivided emission factors and the livestock characteristics affect regional GHGs. Gyeonggi-do, the top emitter among 16 states, records 784 thousand tons $CO_2eq.$ and Daejeon has the highest potential (82 %) of GHGs reduction. Swine is the most contributor for regional GHGs except Seoul and Gwangju, but the share of GHGs for chickens is less than 12 % in spite of the largest livestock population (87 %).

• 한국재료학회지
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• 제15권3호
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• pp.202-208
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• 2005

The surface states of gate dielectrics affect device performance severely in Pentacene OTFTs. We have fabricated organic thin-film transistors (OTFTs) using pentacene as an active layer with chemically modified $SiO_2$ gate dielectrics. The effects of the surface treatment of $SiO_2$ on the electric characteristics of OTFTS were investigated. The surface of $SiO_2$ gate dielectric was treated by normal wet cleaning process, $O_2-plasma$ treatment, hexamethyldisilazane (HMDS), and octadecyltrichlorosilane (OTS) treatment. After the surface treatments, the contact angles and surface free energies were measured in order to analyze the surface state changes. In the electrical measurements, typical I-V characteristics of TFTs were observed. The field effect mobility, $\mu$, was calculated to be $0.29\;cm^2V^{-1}s^{-1}$ for OTS treated sample while those for the HMDS, $O_2$ plasma treated, and wet-cleaned samples were 0.16, 0.1, and $0.04\;cm^2V^{-1}s^{-1}$, respectively.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1994년도 Proceedings of the Korea Automatic Control Conference, 9th (KACC) ; Taejeon, Korea; 17-20 Oct. 1994
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• pp.21-29
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• 1994

This paper presents a method to accommodate failures that affect aircraft dynamical characteristics, especially control surface jams on a large transport aircraft. The approach is to use the slow effectors, such as the stabilators or engines, in the feedforward manner. The simulation results indicate the performance of the RFCS. In some cases of control surface jam, the aircraft cannot recover without using the stabilators. Although the inputs to the slow effectors are determined using the nominal parameters, the effects of parameter change can be compensated by adjusting the control parameters for the fast surfaces. In the case of rudder jam, if the remaining control surfaces and the differential thrust cancel the moments produced by the stuck rudder, using the engine control improves time responses and reduces deflection angles of the control surfaces. If not, however, the aircraft starts a large rolling motion following a yawing motion. In that case, the stabilators should be used to damp the induced rolliig motion, instead of trying to directly cancel the moments caused by the stuck rudder. Unfortunately, the proposed control law for the stabilators does not give such inputs, because it does not take into account the dynamical effects which stuck surfaces have on the aircraft motions. However, we have shown through simulation that the aircraft can be recovered by giving the stabilators the control inputs that counteract the induced rolling moment. Besides, the method has also been shown through simulation to be effective in maintaining control during a situation similar to an actual accident. Finally let us mention a problem with the RFCS. As stated above, we have not established a method to select a trim point which call be reached as easily as possible using the remaining control effectors. In fact, recovery performance considerably depends on the trim states. As pointed out in Ref. 11, finding the best trim point for impaired aircraft will be one of the most difficult questions in RFCS design.

• 한국전자거래학회지
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• 제22권1호
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• pp.37-49
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• 2017

병원 진료의 효율성과 진료 품질의 극대화를 위해 진료예약을 시행하고 있다. 그러나 예약일에 방문하지 않는 예약부도로 인해 의료서비스 자원이 낭비되고 다른 환자의 진료기회를 박탈하는 등 현대 병원 운영에서 주요한 이슈의 하나로 떠오르고 있다. 이러한 예약부도의 원인을 분석하기 위해 미국의 한 보훈병원의 5만 건 진료예약 데이터를 대상으로 예약부도 요인의 중요도와 유의성을 검정하였다. 랜덤 포레스트와 로지스틱 회귀분석 결과, 예약대기시간, 방문율, 내원거리, 예약부도율, 환자 나이, 중증도, 질병의 복합도, 만성통증, 우울증, 약물의존 등이 주요한 원인으로 파악되었다. 예약대기시간과 방문율, 내원거리, 예약부도율은 SMS 사전 통지를 강화하고 사후 전화 상담을 통해 점진적으로 개선 가능할 것으로 판단되며 기타 요인에 대해서는 환자 그룹별로 차별화된 대응방안을 구성하는 것을 고려해 볼 수 있다.

• 디지털융복합연구
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• 제12권6호
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• pp.171-180
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• 2014

최근 주요 기업들은 쇼핑 애플리케이션을 마케팅 전략으로 개발하여 이용하고 있으며, 이러한 전략을 효과적으로 실행하는데 무게를 두고 있다. 이러한 쇼핑 애플리케이션의 대표적인 요소들은 상호작용성 그리고 정보제공성, 이용편리성이 있다. 이에 본 연구는 애플리케이션의 특성이 애플리케이션의 선호도에 미치는 영향에 대해 실증적으로 분석하고, 소비자들의 가격민감도에 영향을 미치는 요인을 찾아 효과적인 쇼핑애플리케이션의 활용전략을 제시한다. 본 연구의 결과는 상호작용과 정보제공성, 이용편리성은 선호도에 긍정적인 영향을 미치는 것으로 나타났다. 또한 애플리케이션의 특징이 선호에 영향을 미칠 때, 가격민감도의 조절효과를 살펴본 결과, 가격민감도가 높은 집단에서는 정보제공성이 가장 유의한 영향으로 나타났고 다음으로 상호작용성과 이용편리성이 유의하다는 결과가 나타났다. 가격민감도가 낮은 집단에서는 정보제공성은 유의하지 않았다. 이러한 결과를 기반으로 기업의 마케팅적 시사점을 도출하였다.

• 디지털융복합연구
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• 제12권6호
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• pp.481-490
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• 2014

본 연구는 노인의 우울증세 현황과 노인의 우울증세에 영향을 미치는 요인을 살펴보는 데 목적이 있다. 2012년 국민건강영양조사 자료를 이용하였으며, 우울증세가 있는 65세 이상 노인 1,429명을 대상으로 하였다. 분석대상자의 우울증세 현황을 파악하기 위하여 기술통계를 실시하였으며, 노인의 우울증세에 영향을 미치는 요인을 파악하기 위해 로지스틱 회귀분석을 실시하였다. 연구결과, 노인의 우울증세는 성, 연령, 개인소득수준, 건강상태, 현재 흡연유무, 만성질환개수와 유의하게 관련이 있었다. 여성, 연령이 높을수록, 소득수준이 낮을수록, 주관적 건강상태가 나쁘다고 느끼는 경우, 흡연을 하는 경우, 보유하고 있는 만성질환의 개수가 많을수록 우울증세를 경험할 확률이 유의하게 높게 나타났다. 따라서 노인의 우울에 대한 사회적 관심과 공감대 형성이 필요하며, 노인들의 삶의 질 향상을 위한 보다 구체적인 접근방안을 모색하는 노력이 필요할 것이다. 이러한 결과들은 향후 보건의료정책 수립에 기초 자료로 의미 있게 활용되어질 수 있으리라 여겨진다.

• The Journal of Advanced Prosthodontics
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• 제5권4호
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• pp.388-395
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• 2013

PURPOSE. The purpose of this study was to estimate the effects of occlusal stability to identify action mechanisms of mouthguards, known to have a modulatory effect on limb muscle function. MATERIALS AND METHODS. This study included 20 male subjects to perform the isokinetic muscle tests and the Wingate anaerobic power test on both knee joints under five closed-mouth conditions: without or with 4 types of mouthguards with thickness of 2 mm based on premolar area: (1) full-coverage, (2) anterior partial-coverage, (3) right posterior partial-coverage, and (4) left posterior partial-coverage. The obtained results were subjected to One-way ANOVA with repeated measures, followed by post hoc test of the contrast method (${\alpha}$=.05). RESULTS. There was no significant difference between the closed position with and without a full-coverage mouthguard in all variables. However, significant differences were observed between with and without a partial-coverage mouthguard in muscular endurance during extension of the left knee, muscular power and endurance during flexion of the right knee. Additionally, significant differences were found between occlusal states with full- and partial-coverage mouthguards in muscular power and endurance during extension of the left knee. CONCLUSION. These findings indicate the elevation of vertical dimension by 2 mm or the inducement of occlusal stability had little effect on isokinetic muscle strength and anaerobic performance, while uneven distribution of occlusal force might have some positive effects.

• 대한간호학회지
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• 제24권3호
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• pp.345-363
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• 1994

This study attempted to identify important problems of the factors related to the indwelling catheter with closed drainage and to enhance recognization of Urinary Tract Infection management to protect patients with indwelling catheter from UTI. We selected the 58 patients with indwelling catheter with closed drainage from md-surg. intensive care units, and general neurological and neurosurgical ward, in one hospital in Pusan, Korea from May 30 to October 15, 1993. Patients were examined by urinary analysis before inserting catheter and then by urine cultures three times. The obtained data was analized using an SPSS /PC$^{+}$ The statistical analyses employed here was the frequency, percentage and x$^2$-tests. 1. Analyses for Indwelling Catheter induced UTI and infection rates were found to be presented in patients related to the factors of being on antibiotic drugs (x$^2$=14.105, p=.000) and the duration of the indwelling catheter(x$^2$=58.0, p=.000), both of which were found to affect the UTI. 2. UTI rates according to the duration of the in-dwelling catheter were high 8.6％ for the 2nd day, 27.6 for the 4th day, and 36.2% for the 7th day, and as the duration for the indwelling catheter was longer, UTI rates were higher. 3. The UTI rates according to the duration of the indwelling catheter related re factors, on the 7th day, were high-52.0% for women, 37.0% for more than 50 years in ages, 30.0% for patients under sur-gery, 33.3% for altered mental states outsides the alert, 76.7% for patients not given antibiotic drugs, 36.4% for less than 3500cc of fluids intakes, it was found that these affected to increase the UTI. 4. Causative organisms of UTI were found ; E.Coli appears the most than all other isolated organisms in women and Klebsiella and Pseudomonas in men. For antibiotic susceptibility of causative organisms, all causative organisms were found to be susceptible to Sul -cefoperazone, Trim-prim, and unasyn and Pseudomonas mostly net susceptible.e.

• 한국통신학회논문지
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• 제38C권11호
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• pp.955-965
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• 2013

합동전술정보분배체계는 미국, 북대서양조약기구 및 기타 연합군에서 운용하고 있는 Link-16의 통신 터미널로 사용된다. 최근 민간 항공분야에서의 교통량 증가로 인해 주파수 수요가 급증함에 따라 Link-16에서 사용 중인 주파수는 다른 시스템에 재할당될 예정이며, 이는 Link-16의 성능에 영향을 미칠 것으로 예상된다. 따라서 본 논문에서는 주파수 대역 감소에 따른 Link-16 성능의 영향을 모의실험과 수치 해석을 통해 기존 성능과 비교하였다. 성능 분석 결과, Nakagami 페이딩과 부분대역 잡음 재밍 환경에서 주파수가 재할당된 Link-16은 성능이 감소됨에도 불구하고 높은 항재밍 능력을 유지하였으며, 동일 시간슬롯에서 다수 사용자들을 지원할 수 있음을 확인하였다.