• Clinics in Shoulder and Elbow
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• 제6권2호
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• pp.161-166
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• 2003

Purpose: To evaluate the usefulness of arthroscopic repair that was related with full thickness rotator cuff tear and assess clinical result. Materials and Methods: Twenty-one cases of arthroscopically repaired full thickness tear of rotator cuffs were studied. Between October 1998 to July 2002 we have analysed 21 repairs of FTRCT the average age 54(42∼74) years old, mean follow-up was 24(12∼41) months We analyzed the results statistically by paired t-test. Results: Postoperative VAS of pain improved average 7.2 to 1.9, UCLA score improved 13.9 to 31.9, ADL improved 11.5 to 25.5 respectively(all, p<0.001). Eighty-seventh ％ of the patients showed excellent St good results at the final follow-up. The satisfied rate was 90.5%(19cases). Conclusions: Arthroscopic repair in full thickness rotator cuff tear is effective surgical methods.

• 대한기계학회논문집B
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• 제30권12호
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• pp.1236-1242
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• 2006

The local heat flux of spray cooling in the film boiling region were experimentally investigated for the spray region of $D_{max}$ = $0.005{\sim}0.03m^3/(m^2s)$. A twin-fluid full cone spray nozzle was employed for the experiment and the distributions of droplet flow rates were obtained for air-water full cone sprays. A stainless steel block was cooled down from initial temperature of about $800^{\circ}C$ by full cone spray. In the region near the stagnation point, it was found that the experimental data are in good agreement with the results predicted from the correlations between the local heat transfer and the local droplet flow rate proposed in the previous report. However, it was found that the experimental data of $D_r$ > $0.01m^3/(m^2s)$ are a little smaller than the results predicted from the correlations.

• 방송공학회논문지
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• 제23권2호
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• pp.293-301
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• 2018

일본향 디지털 지상파 TV 규격인 ISDB-T는 OFDM 기술을 기반으로 하여 6MHz인 대역폭을 13개의 세그먼트로 나누고 그중에서 12개의 세그먼트(풀세그)는 고정형 수신기를 위한 고화질 방송에 할당하고 1개의 세그먼트(원세그)는 이동형 수신기를 위한 모바일 방송에 할당한다. 원세그는 QPSK 변조를 사용하여 고속 이동 중 수신이 가능하지만 데이터율이 낮아 대화면의 모바일 기기에는 그 화질이 크게 떨어지고, 풀세그는 고화질을 지원하지만 64QAM 변조를 사용하므로 고속 이동 수신이 어렵다. 본 논문에서는 반송파 간 간섭 제거 기술, 고속 채널 추정 기술, 안테나 다이버시티 기술을 ISDB-T 풀세그 수신기에 적용하여 그 이동 수신 성능을 평가하고 가능성을 확인한다.

• 한국분무공학회지
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• 제13권3호
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• pp.143-148
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• 2008

In the present study, the correlation between the Nusselt number and Reynolds number was developed for forced convection and nucleate boiling region in spray cooling. Also the effect of droplet subcooling on spray cooling heat transfer was investigated. Full cone spray nozzles were employed for spray cooling experiment, and water and FC-77 were used for developing the correlation. From the experimental results, the correlation between the Nusselt number and Reynolds number based on droplet-flow-rate was developed. The correlation shows good predictions with ${\pm}30%$ error for water and FC-77.

• 대한전자공학회논문지
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• 제8권1호
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• pp.1-8
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• 1971

G-M 계수관을 이용한 beta와 gamma 선에 민감한 survey meter에 관한 연구이다. 이 장치는 완전 transistor화 되어 있으며 건전지로 동작하게 되어 있고 2.5, 25 및 250MR/HR의 3가지의 full-scale meter range를 직독하게 되어 있다. Counting-rate meter 회로를 이루고 있는 collector 결합 단안정 multivibrator와 전원회로의 de-dc 변환로를 이루고 있는 무안정 blocking 발진기의 해석을 하였고 설계식을 유도하였다. G-M 계수관의 분해시간을 높이기 위하여 0.5v 정도의 낮은 전압으로 triggering할 수 있게 설계하였다.

• 대한가정학회지
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• 제38권8호
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• pp.111-124
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• 2000

The study of prematurity stereotyping is important because the optimal development of premature infants may be threatened by the operation of the stereotape. The study was conducted in which mothers were asked to rate unfamiliar infants shown on videotapes. The infants were described as either full term or premature and as either male or female. Each mother was asked to rate the infant on 23,7-point adjective scales(S-KISS) and to answer several other questionnaires(LOT, PSI). In the study, infants labeled premature were rated more negatively than were infants labeled full term, but infants labeled male and female were rated similarly. The behavioral implications for child rearing as a result of this "prematurity stereotyping" were considered. Correlational analyses revealed significant relationships between prematurity stereotyping and parenting stress, optinism and parenting stress. Optimism effects parenting stress.

• Journal of Communications and Networks
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• 제17권4호
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• pp.346-350
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• 2015

It is known that the progressive edge-growth (PEG) algorithm can be used to construct low-density parity-check (LDPC) codes at finite code lengths with large girths through the establishment of edges between variable and check nodes in an edge-by-edge manner. In [1], the authors derived a class of LDPC codes for relay communication systems by extending the full-diversity root-LDPC code. However, the submatrices of the parity-check matrix H corresponding to this code were constructed separately; thus, the girth of H was not optimized. To solve this problem, this paper proposes a modified PEG algorithm for use in the design of large girth and full-diversity LDPC codes. Simulation results indicated that the LDPC codes constructed using the modified PEG algorithm exhibited a more favorable frame error rate performance than did codes proposed in [1] over block-fading channels.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2014년도 추계 종합학술대회 논문집
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• pp.415-416
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• 2014

Previous studies in various medical specialties have shown that fewer than 50% of abstracts presented at meetings are subsequently published, but only a few studies have been performed in pediatric dentistry. The purpose of this study was to investigate the rate of publication of articles based on abstracts presented at the Korean Academy of Pediatric Dentistry (K.A.P.D) spring and fall Congress for 2001 to 2011. The abstracts for both oral and poster presentation were collected. A RISS search was then performed to identify the publication of full-length articles based on those titles of the abstracts. A total of 822 abstract presentations were done at the 22 meetings (543 as oral presentation, 279 as poster presentations). Of these, 42.2% (347) was subsequently published. The publication ratio for orally presented abstracts was 50.6% (275), poster presentations 25.8% (72). We suggest that presenters at these meetings should expand their abstracts into full manuscripts and seek to publish them in peer-reviewed journals for the benefit of the profession.

• International Journal of Korean Welding Society
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• 제3권2호
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• pp.15-23
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• 2003

A genetic algorithm was applied to an arc welding process to determine near optimal settings of welding process parameters which produce good weld quality. This method searches for optimal settings of welding parameters through systematic experiments without a model between input and output variables. It has an advantage of being able to find optimal conditions with a fewer number of experiments than conventional full factorial design. A genetic algorithm was applied to optimization of weld bead geometry. In the optimization problem, the input variables were wire feed rate, welding voltage, and welding speed, root opening and the output variables were bead height, bead width, penetration and back bead width. The number of level for each input variable is 8, 16, 8 and 3, respectively. Therefore, according to the conventional full factorial design, in order to find the optimal welding conditions, 3,072 experiments must be performed. The genetic algorithm, however, found the near optimal welding conditions from less than 48 experiments.

• Journal of Welding and Joining
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• 제18권5호
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• pp.63-69
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• 2000

A genetic algorithm was applied to an arc welding process to determine near optimal settings of welding process parameters which produce good weld quality. This method searches for optimal settings of welding parameters through systematic experiments without a model between input and output variables. It has an advantage of being able to find optimal conditions with a fewer number of experiments than conventional full factorial design. A genetic algorithm was applied to optimization of weld bead geometry. In the optimization problem, the input variables was wire feed rate, welding voltage, and welding speed and the output variables were bead height, bead width, and penetration. The number of level for each input variable is 16, 16, and 8, respectively. Therefore, according to the conventional full factorial design, in order to find the optimal welding conditions, 2048 experiments must be performed. The genetic algorithm, however, found the near optimal welding conditions from less than 40 experiments.