• 대한임상전기생리학회지
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• 제11권1호
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• pp.21-29
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• 2013

Purpose : The purpose of this study was to determine the changes in ultrasound imaging of the lower limbs in patients with degenerative osteoarthritis who received a total knee replacement (TKR). Methods : The participants for the study were ten patients who were to receive a total knee replacement. Measurements were taken a total of three times: before receiving a total knee replacement, and one week and two weeks after receiving a total knee replacement. The vastus medialis, rectus femoris muscle, tibialis anterior and gastrocnemius muscle were measured using ultrasound imaging. Results : Muscle thickness of the vastus medialis, rectus femoris muscle, tibialis anterior and gastrocnemius muscle had no significant interaction over time whether surgery was performed or not. White area index (WAI) and density of vastus medialis, rectus femoris muscle, tibialis anterior and gastrocnemius muscle had no significant interaction over time whether surgery was performed or not. Conclusion : In conclusion, lower quality muscles were due to a decrease in muscle fiber and an increase in fat fiber. Therefore, initial physical therapy after total knee replacement should consider this point and be designed appropriately as a therapeutic approach for total knee replacement patients.

• 한국환경과학회지
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• 제15권1호
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• pp.45-58
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• 2006

In order to grasp physical characteristics of Ganajin Bay receiving the effluents from land, a comprehensive field surve)'has been conducted at the north of Wando and Gogeumdo in 2002. Water temperature was most high in September while most low in December. A high temperature in September was inferred to have caused by the dispersion of warm fresh water with favor of a dominant wind in autumn. However, salinity and sigma-t in situ was most low in September while most high in December. A low salinity (or density) in September turned out to reflect the influence of a dense rainfall in summer. Water temperature, salinity and density at the surface layer were lower than those at the bottom layer, except for December. Their horizontal profiles suggested the influence of effluents such as Tamjin River. Particularly, time series of water temperature acquired near the sluice and at the north channel of Wando tended to rise at the flood flow but fall at the ebb flow in accordance with the tide. The form ratio of the tide in the study area was $0.31\~0.32$ and the amplitude of the tide appeared to increase towards the west. Northeastward or southwestward flows prevailed in this area but the residual flows were all northeastward with a magnitude of $3\~4cm/s$.

• 한국식품조리과학회지
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• 제25권4호
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• pp.474-487
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• 2009

The principal objectives of this study were to evaluate the space, equipment, and institution rate by functional area, and to suggest appropriate types, numbers, and equipment capacity by school foodservice size for optimal employee job performance and efficiency. Data were collected and administered by 263 dietitians who attended elementary and middle schools in Gyeonggi Province, and the data were analyzed using SPSS statistical software. Among a total of 72 respondents who provided usable data, 31 (48.6%) respondents were nutrition teachers and 37 (51.4%) were part-time dietitians. The majority of the respondents reported that their foodservices were self-operating types (94.4%), and 8 meals out of 10 meals provided over a 2-week period were served as normal meals, defined as meals consisting of Bab, Kook, Kimchi, and 3 side dishes (73.6%). The mean kitchen space was $186.25\;m^2$ for 500 meals/day, $269.7\;m^2$ for 501 to 1,000 meals/day, $249.1\;m^2$ for 1001 to 1500 meals/day, and $274.87\;m^2$ for 1,500 or more meals/day. The mean space of functional areas was $11.52\;m^2$ for office, $12.63\;m^2$ for storeroom, $9.55\;m^2$ for receiving area, $27.23\;m^2$ for pre-preparation area, $149.9\;m^2$ for cooking area, $18.33\;m^2$ for assembly/service area, $45.50\;m^2$ for dishwashing area, and $17.20\;m^2$ for locker room. Only two pre-preparation and cooking spaces increased significantly with increasing size of school foodservice (p<0.05). Office, cooking area, and locker room were allocated in all foodservices. However, the pre-preparation area (68.7%), receiving area (56.5%), assembly/service area (38.1%), and dishwashing area (37.7%) were lowly installed in the surveyed facilities. Through a focus group meeting discussing the results of this study, appropriate equipment and its dimensions were suggested according to functional areas and foodservice scales. Future studies will be necessary to allocate the appropriate space by functional area with the proposed equipment requirements for optimally efficient decision making in equipment purchasing.

• 한국수자원학회논문집
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• 제42권8호
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• pp.631-641
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• 2009

본 연구는 부영양화되어 있는 하구감조역에서의 $N_2O$생성과 거동을 파악하는 것을 목적으로 도시역에서의 N2O발생에 착안하여 그 중에서도 인위적 임팩트가 크다고 판단되는 하수처리수 생활폐수 등이 유입되는 도시하천감조역을 대상으로 현지 정점조사를 실시하여 수역의 사계절에 걸친 각 질소성분의 농도변화와 flux를 상세히 파악하고 저질간극수 중의 연직분포를 측정하였다. 그 결과, 완혼합이고 염수쐐기설(楔)가 형성되는 Tatara천(川)에서 하수처리수는 해수의 혼합형태의 영향을 크게 받고 고농도수괴(水塊)로서 표층을 이동하고 있으며, 이 수역의 질소변환기구 및 $N_2O$생성과정에 큰 영향을 미치고 있는 것이 밝혀졌다. 이 수역에서 관측된 $N_2O$농도는 1.8-20.9 $\mu M$로서 대기중의 포화농도와 담수중의 포화농도를 고려하면 항상 포화농도상태이며, 주발생원은 수역저토였다. 저질간극수 중의 각 질소성분의 농도분포는 호소와 인근해역에서의 분포와는 달리 분자확산 이외의 수송경로가 있다는 것이 시사되었다.

• 한국시뮬레이션학회논문지
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• 제25권4호
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• pp.31-42
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• 2016

본 연구는 국내에서는 현재 개발 성공사례가 없는 건설 장비 중 하나인 지능형 브레이커의 자동타격조절 핵심기술을 파악하는 것을 목적으로 하고 있다. 연구진행은 다음과 같은 절차로 진행된다. 우선 수압면적과 개도면적, 포트의 연결 관계를 파악하여 해석모델을 개발한다. 그리고 해석모델에 경암과 연암을 오가는 상황을 모사하여 연속적으로 장타모드와 단타모드의 가변이 가능한지 검증한다. 마지막으로 해석결과로부터 타격모드가 가변될 때 발생하는 자동제어밸브의 동적거동을 분석하여, 자동타격조절의 핵심원리를 파악한다.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2001년도 추계학술대회 논문집
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• pp.156-159
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• 2001

Recently, side scan sonar system has been developed and operated to survey cable laying, sunken bodies, geometry of sea bottom and so on. It uses the acoustic signals, which are emitted from two transducer arrays, left and right sides, to get geometric information of the specified area. This system consists of transceiver board, towed body, deck unit and GPS receiver. The transceiver board, nested in a watertight canister, controls the transmitting and receiving of the acoustic pulses from transducer arrays. After receiving the scattered signals, it processes BP(Band Pass) filtering, AGC(Automatic Gain Control), TVG(Time Varying Gain) and Heterodyne. The deck init has the signal processing part, A/D converter, power supplier, and real-time monitoring part. The towed body has been designed to satisfy the optimal hydrodynamic behavior during towing, In this paper, brief introductions on the design theory of transceiving part and some results from the field which have been operated recently will be introduced.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2000년도 추계학술대회 논문집
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• pp.222-227
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• 2000

"Side scan sonar" using acoustic signal has been developed to survey cable laying, sunken bodie\ulcorner bottom and so on. It use the acoustic signals, which are emitted from two transducer arrays, to get gemetri\ulcorner target area. This system consists of transceiver board, towed body, and deck unit. The transceiver board, w\ulcorner watertight canister of the towed body, controls the transmitting and receiving of 400kHz acoustic signals from \ulcorner After receiving the scattered signals, it processes the filtering, AGF(Automatic Gain Control), TVG(Time Heterodyne. The deck unit is composed of the signal processing part, A/D converter, power supplier, and real\ulcorner And the towed body has been designed to satisfy the optimal hydrodynamic behavior during towing. The de\ulcorner theory of transceiving part and some results from field-experiments will be introduced here.

• 한국전자파학회논문지
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• 제29권8호
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• pp.599-607
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• 2018

본 논문에서는 지상에 수신 레이다들이 배치된 바이스태틱(bistatic) 환경에서 SAR(synthetic aperture radar) 이미징(imaging) 기법을 적용하여 이동표적을 탐지 및 이미징할 수 있는 지대공 바이스태틱 레이다 시스템 및 이에 대한 구현 알고리즘을 제안한다. 제안 시스템이 기존 SAR 시스템과는 달리 수신 레이다들의 집합에 의해 안테나 개구면(aperture)을 합성하도록 하여 탐지 영역에 대한 조사(illumination)가 길 필요가 없으며, 또한 표적 영상 복원을 위해 평면파 근사화(planewave approxiamtion)에 기반한 SAR 폴라 포맷(polar format) 알고리즘을 적용함으로써 수신 레이다들이 공간상에서 균일하게 이격될 필요가 없음을 보인다. 인접 펄스 수신신호 처리를 통한 클러터 성분 제거 과정이 포함된 영상 복원 알고리즘을 유도하며, 시스템 구현과 관련된 영상 해상도 및 수신 레이다의 공간상 위치 불규칙성에 따른 보상 방법을 설명한다. 최종적으로 시뮬레이션을 통해 제안 시스템의 성능을 보인다.

• 종양간호연구
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• 제4권2호
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• pp.135-142
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• 2004

Purpose: To examine informational needs of cancer patients receiving chemotherapy. Methods: A cross-sectional survey design was utilized. The sample was 198 cancer patients receiving chemotherapy for a diagnosis of stomach or lung cancer at a university hospital. A modified version of Toronto Informational Needs Questionnaire was applied. Results: Subjects reported highest informational needs in prognosis dimension, followed by the treatment dimension including side effects and alternative therapy. Information about medical tests and follow-up care after the treatment was also in great need. Dimensions of support for patients/family and sexuality were low in need. The degree of informational needs was negatively correlated with patient's age and number of children. Differences were found in informational needs according to the educational level employment status, and gender of the patients, while diagnosis and treatment options did not make differences in informational needs. Conclusion: Health care professionals need to perceive informational needs of cancer patients receiving chemotherapy, and to provide them with information especially in the area of prognosis and treatment. Informational intervention would be effective when it is given with consideration of patient's characteristics.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 추계학술대회
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• pp.158-161
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• 2010

본 논문에서는 현재 3GPP에서 진행되고 있는 차세대 이동통신 기술 표준, 즉 LTE 시스템의 하향 링크 전송방식의 수신성능을 향상시키기 위해 기지국(BS)과 단말(MS) 사이에 릴레이(RS) 설치를 제안하고, BS의 위치와 설치된 RS의 거리를 각각 500m, 1000m로 하고 RS의 전송방식을 OFDMA와 SC-FDMA를 선택함으로써 수신성능을 높이기 위한 연구를 수행 하였다. 연구결과 RS의 위치가 BS와 가까울수록 RS에서는 SC-FDMA를 사용하는 것이 좋게 나왔고, 반대로 BS와 RS의 거리가 멀어질수록 RS에서는 OFDMA를 사용하는 것의 성능이 좋은 것으로 나왔다. 또한 BS와 MS 거리의 중심지역에서는 그 상황에 맞는 전송방식을 사용함으로써 시스템의 수신성능을 향상시킬 수 있었다.