반향제거기 성능분석에 관한 연구

金東龍,曺海豊 全北大學校 1990 論文集 Vol.32 No.-

ISDN(Integrated Services Digital Network) can be standardized digital transmission of various voice and data information. In digital transmissions, simultaneous two-way transmission of data signals over two-wire circuits can, in principle, be achieved by the application of hybrid couplers. In a two-wire full-duplex transmission circuit, a transversal filter, a lookup table and multi-RAM(m-RAM) are generally proposed for Echo Canfellation Method(ECM), and the adaptation algorithms are prepared for them. In this paper we describe convergence performance of ECM with sign algorthm, and to find out the result we used computer simulations.

루쏘의 이원성과 여성관

金惠東 慶熙大學校 1985 論文集 Vol.14 No.-

모세관 전기영동 장치를 이용한 음이온계 계면활성제의 분석

정혁,김승선,이병민,강호철,이원,김해동 숙명여자대학교 환경과학연구소 1995 환경과학 Vol.2 No.-

모세관 전기영동 장치를 이용하여 금속 표면 세척제(상품명 BFA와 BCA) 2종에 포함된 음이온 계면활성제 대한 정성 및 정량분석을 수행하였다. Acetonitrile과 sodium benzoate를 포함하는 pH 10의 완충용액을 이용하여 18kV의 전압하에서 분리한 결과10^4 이상의 이론단수를 보이는 좋은 electropherogram을 얻을 수 있었다. S/N∼3인 농도를 기준으로 검출한계는 ∼5ppm이었으며 표준물질을 이용하여 얻은 검정곡선의 경우 농도가 10∼100ppm의 범위에서 ∼0.99 이상의 상관계수를 갖는 좋은 직선성을 보였으며, 이러한 결과를 바탕으로 분석한 결과 BFA의 경우 음이온 계면활성제의 각 성분은 octanoate, decanoate, dodecanoate, tetradecanoate, hexadecanoate 등이었으며 상대비는 각각 1.0 : 1.0 : 6.5 : 2.1 : 0.8 이었다. Qualitative and quantitative analysis for the anionic surfactants used in the metal washing fluid (brand names are BFA and BCA) was performed by the capillary electroihoresis. Acetonitrile and sodium benzoate were mixed with the buffer solutioin which controlled at pH 10. Under the 18kV applied voltage, the electropherograms have shown the theoretical plates more that 10^4. Determined as the concentration at the S/N∼3, the typical detection limit was ∼5ppm and the calibration curves have shown the correlation coefficients higher than ∼0.99. Based on these results, it was concluded that each components were octanoate, decanoate, dodecanoate, tetradecanoate, hexadecanoate and the relative ratio was 1.0 : 1.0 : 6.5 : 2.1 : 0.8 for the BFA.

단일 사례 사격선수의 집중루틴 훈련의 효과

장덕선,김병준,구해모,신동성 한국스포츠심리학회 2004 한국스포츠심리학회지 Vol.15 No.1

본 연구는 소총사수 P의 집중력 훈련에 관한 것이다. P 선수는 만 21세의 남자선수로서 운동경력은 8년이며, 10M 공기소총이 주종목이다. 집중력훈련은 단일사례실험 중 가장 단순한 시계열 설계인 AB 설계를 적용하였다. A단계에서 집중력, 주의력 질문지가 1-2주 간격으로 4회 반복측정 되었으며, B단계는 7월-10월까지 집중력 훈련이 진행되는 기간으로 개별면담과 질문지 측정, 수행평가를 위한 시합기록이 수집되었다. 집중력 질문지는 1개월에 1회 측정되었고, 주의력 검사지는 집중훈련 전과 후에 각각 한차례 시행되었다. 집중 루틴은 선수의 개인적 습관과 장점을 최대한 존중하여 훈련과 최고시합 때 습관적으로 하는 행동과 생각을 포함시켜 상당한 시합 부담 상황에서도 최고시합때의 행동과 생각의 흐름을 유지할 수 있도록 강력한 의미를 가진 행위와 키워드로 구성하였다. 완성된 루틴 프로그램은 4개월 훈련 후 집중력과 주의력, 수행평가를 실시하였다. 훈련결과 루틴 훈련은 집중조절 능력을 향상시켰으며, 주의유형은 긍정적인 형태는 증가하고 부정적 형태는 감소하였다. 수행 기록은 루틴 훈련 과정에서 출전한 5회 시합에서 모두 결선에 진출하므로서 수행향상에도 기여한 것으로 밝혀졌다. This study is about a concentration training of a rifle Marksman, P, The male Marksman P is 21 years old, and has played a rifle for eight years. His major is 10M air rifle. We apply AB design which is the simplest time-series design among single case experiments. In A step, we have applied the questionnaire for examining the ability of concentration and attentiveness for four times at an interval of 1 or 2 weeks. In B step, we developed a programme for improving the concentration training and applied it to the player. During the training in B step, which had continued from July to October, we have collected individual interviews, survey, records of games in order to evaluate achievement. The questionnaire for concentration has been served once a month, and the TAIS has been operated once each time before and after the concentration training. The concentration routine is directed to the way of considering the athlete's personal habit and merit most. Therefore, the concentration routine includes the essential matters of habitual acting and thought in ordinary training and in the final match. The concentration routine is consist of powerful meaningful movement and keyword in order to maintain the stream of movement and thought at the final match even though the Marksman is under the heavy pressure of the game. The practice evaluation has been done by a completed routine programme after the four-month-training. After examining the result of the evaluation, the concentration training improves the ability of controlling concentration. The positive type of TAIS is increased and the negative type is decreased. About the record of achievement, the player had advanced to the final once before the training, on the other hand, advanced to all the five final matches after the training. Consequently, it is discovered that the concentration training contributes to the achievement.

In-Situ 반응소결에 의한 전도성 Si₃N₄-TiN 복합세라믹스 제조

이병택,박동수,윤여주,김해두 공주대학교 자원재활용 신소재 연구센터 1999 1차년도 센터 성과집 Vol.1999 No.-

전도성 Si₃N₄-TiN세라믹 복합재료를 제조하기 위해 성형체를 1450℃에서 20시간 질화처리한 후 1950℃에서 3.5시간 가스압소결 기술에 의해 후소결하였다. 초기 분말로 약 10㎛로 된 상용 Si분말, 100mesh와 325mesh로 된 Ti분말, 그리고 미세한 2.5㎛ Ti분말을 사용하였다. Ti분말을 사용한 Si₂N₄-TiN소결체에서 상대밀도 및 파괴인성값은 다량의 조대한 기공의 존재로 인하여 낮은 값을 보였다. 그러나 Ti분말을 사용한 Si₃N₄-TiN복합체에서 파괴인성, 파괴강도, 및 전기저항은 각각 5.07MPaㆍm1/2, 624MPa 그리고 1400Ωm였다. 복합체에서 TiN 입자의 분산은 Si₃N₄입자의 조대한 봉상형태로의 성장을 방해아며 Si₂N₄/TiN계면에 강한 변형장을 만든다. Si₂N₄-TiN복합체의 전기전도도 및 기계적 특성을 향상시키기 위해 TiN 입자가 균일하게 분산된 미세조직 제어가 요망된다. In order to maek the electroconductive Si₂N₄-TiN composites, the Si-Ti(N) compacts were nitrided at 1450℃ for 20hours, and thhn they post-sintered by a gas-pressure-sintering technique at 1950℃ for 3.5hours. As starting powders, commercial Si powder of about 10㎛, two types of Ti poweders, the relative density and fracture strength and electrical conductivity are low due to the existence of large amounts of coarse pores. However, in the Si₃N₄-TiN composite used Tin powder, the fracture toughness, fracture strength and electrical resistivity were 5.07MPaㆍm1/2, 624MPa and 1400Ωcm, respectively. The dispersion of TiN particles in the composite inhibited the growht of Si₃N₄, in the shape of rod and made strong strain field contrasts at the Si₃N₄/TiN interfaces. It was recognized that microstructural control is required to improve the electrical conductivity and mechanical properties of Si₃N₄-TiN composites vy dispersing TiN particles homogeneously.

Local Delivery of Green Tea Catechins as an Approach to the Prevention of Stenosis Following Angioplasty of the Rat Carotid Artery

KIM,DONG WOON,Park,Young Sun,Kim,Young Gyu,Kim,Seung Taik,Piao,Hai Nan,Youn,Tae Jin,Cho,Myeong Chan,Ahn,Hee Yul 한국지질학회 2001 韓國脂質學會誌 Vol.11 No.1

Effect of Si/α-Si₃N₄ Ratio on the Shape of Silicon Nitride Particles Produced by SHS Method

Kim, Min-Sung,Park, Dong-Soo,Han, Byung-Dong,Kim, Hai-Doo,Park, Chan The Korean Ceramic Society 2002 한국세라믹학회지 Vol.39 No.3

Si and ${\alpha}-Si_3N_4$ powder mixtures added with 3 wt% $Y_2O_3$ were reacted under 5 MPa nitrogen pressure. The reaction products contained ${\alpha}-Si_3N_4$ particles with elongated shapes. Length and width of the elongated grains were the maximum when the starting powder mixture of 50 wt% Si - 47 wt% ${\alpha}-Si_3N_4$ and 3 wt% $Y_2O_3$ was used. Aspect ratio of the elongated grains were between 4.4 and 5. When the starting powder mixture contained 70 wt% Si, large particles with irregular shapes appeared. Meanwhile, the reaction did not proceed when the starting powder mixture contained 30 wt% Si and less. The SHS product was easy to crush and the elongated particles obtained from the starting powder mixtures of 40 wt% Si - 57 wt% ${\alpha}-Si_3N_4$ - 3 wt% $Y_2O_3$ and 50 wt% Si - 47 wt% ${\alpha}-Si_3N_4$ - 3 wt% $Y_2O_3$ were good candidates for the seeds.

Prevalence and Seroprevalence of Low-Risk Human Papillomavirus in Korean Women

Kim, Min-A,Oh, Jin-Kyoung,Kim, Bo Wook,Chay, Doobyung,Park, Dong Choon,Kim, Seok Mo,Kang, Eun-Suk,Kim, Jae-Hoon,Cho, Chi-Heum,Shin, Hai-Rim,Seo, Kyung The Korean Academy of Medical Sciences 2012 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.27 No.8

<P>Little is known about the prevalence and seroprevalence of low-risk human papillomavirus (HPV) and the risk factors for HPV infection in Korean women. We determined the prevalence of low-risk HPV among 902 women aged 20-59 yr and the seroprevalence of low-risk HPV subtypes 6 and 11 among 1,094 women aged 9-59 yr in the general population. Genital low-risk HPV DNA was assessed by liquid hybridization and polymerase chain reaction. Antibody titers against HPV 6 and 11 were measured by a multiplexed competitive luminex technique. The prevalence of genital low-risk HPV was 4.9%. It reached its highest peak of 10.3% at 20-29 yr of age and a second peak of 3.2% at 50-59 yr of age. The seroprevalence of HPV 6 or 11 was 9.4%. It reached its highest peak of 12.7% at 25-29 yr of age and a second peak of 12.3% at 50-59 yr of age. In multivariable analysis, the number of lifetime sexual partners and past history of sexually transmitted diseases were associated with the seroprevalence but not prevalence of HPV. It is suggested that younger women should receive prophylactic HPV vaccination before they become sexually active and exposed to HPV in their 20s. This study provides baseline data for developing HPV vaccination programs and monitoring vaccine efficacy in Korea.</P>

Self-assembled Dendrimer/Polyelectrolyte Layers on Indium Tin Oxide Electrodes as a Matrix for Immobilization of Gold Nanoparticles and Fluorophores

Kim, Jun-Myung,Ju, Hee-Young,Choi, Hong-Seok,Lee, Jung-Hwa,Kim, Jeong-Sun,Kim, Jung-Ahn,Kim, Hai-Dong,Kim, Joo-Hoon Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.2

Frontier Symposium 1 : Genomics Symposium ; High-throughput identification of the genes regulating the carcinogenesis processes in stomach and Liver tissues

( Dong Min Kim ),( Sang Hyun Min ),( Hai Yong Jung ),( Mee Hee Park ),( Soo Jin Lim ),( Mi Ra Kim ),( Ye Jin Jang ),( Heon Sik Lee ),( Nam Soon Kim ),( Young Il Yeom ) 한국생화학분자생물학회 (구 한국생화학회) 2004 생화학분자생물학회 춘계학술발표논문집 Vol.2004 No.-