• 드라이브 ㆍ 컨트롤
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• 제15권4호
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• pp.48-54
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• 2018

The hydraulic servo actuator has always operated very precisely with high frequency and small displacement, and is used continuously for a long time. The hydraulic servo actuator of the test equipment used in the accelerated life test in order to guarantee the service life of the automotive parts failed earlier than the products before finishing the test. This study performed an analysis on the cause of the failure of the hydraulic servo actuator used in the test equipment, changed the design of the actuator to solve the root cause of the main failure mode, and developed the improved servo actuator. Based on above process, this study established a better performances and longer lifetime of the servo actuator after testing.

• Computers and Concrete
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• 제33권4호
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• pp.373-384
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• 2024

In this study, a novel mountain train system was developed that can run along a steep gradient of 180 ‰ and sharp curve with a minimum radius of 10 m. For this novel mountain train, an embedded precast concrete rack rail track was implemented to share the track with an automobile road and increase constructability in mountainous regions. The embedded rack rail track is connected to a hydraulically stabilized base (HSB) layer with shear anchors, which must have sufficient longitudinal resistance because they bear most of the traction forces originated from the rack rail and longitudinal loads owing to the steep gradient. In addition, the damage to the shear anchor parts, including the surrounding concrete, must be strictly limited under the service load because the maintenance of shear anchors inside the track is extremely difficult after installation. In this study, the focus was made on the shear anchor behavior and design an embedded rack rail track, considering the serviceability and ultimate limit states. Accordingly, the design loads for mountain trains were established, and the serviceability criteria of the anchor were proposed. Subsequently, the resistance and damage of the shear anchors were evaluated and analyzed based on the results of several finite element analyses. Finally, the design method of the shear anchors for the embedded rack rail track was established and verified.

• 한국조리학회지
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• 제3권
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• pp.271-289
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• 1997

The purpose of this study is to investigate previous data and possibility of the new culture building, insuring substantiality of the education in junior college, increasing of practical carrier, acquiring the money for practical class, and the direction of demand for education in a high level of industrial society. There's two parts to consist of investigation and the model case in wedding business in Junior college. The research groups in one part consist of 277 students in Junior college. The result were as follows: 1) The students would like to get the wedding business in new culture building. (72%) 2) The student shave got a idea to recommend to use the wedding facilities for their for their relative sand friends. (51%) 3) The trend of selecting in wedding facilities is outside than inside of facilities. (75%) 4) They would like to have the buffet service after wedding celemony, not a la carte for choose the meal. The above research data suggest that if the wedding facility's management would be accept, we could have expectation about development of junior college, emphasis of practical education and good wedding culture in this areas. For the most of student, they has a righ hand to manage the wedding facility in their college. First, the culinary students could have an experience of service practies to the customer in wedding celemony, as the result of training will be great. Second, the college could show their vision and hope to customer to interest it. Third, it can be supplied the right wedding culture and the wedding facilities which is low price and good circumstance for wedding. Fourth, it's very resonable to use the culture facilities during no class, Saturday and Sunday. Fifth, income from business can be used only a scholarship and a community development. Sixth, it can be induced the self-participication and motivation to take up a positive attitude for their life.

• 한국실내디자인학회논문집
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• 제17호
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• pp.22-29
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• 1998

As the trend shows that corporate investment for staff's welfare facilities has increased alongside employee's enhanced economic and conscious level which has resulted from economic growth and industrialization this study aims at analyzing interior design elements in staff's welfare facilites especially in cafeteria and suggesting new directions for designing those spaces. The method and scope of this study in firstly to described general points such as function and role of public food service and interior design elements in staff's cafeteria and then to grasp and analyze the present conditions of the staff's cafeteria for enterprises and financial organizations which has been built after 1990. The conclusion of his study can be summarized as follows : First it is desirable to locate employee's cafeteria on upper or top floor which has relatively good atmosphere. Second it is recommended to make overall atmosphere of employee's cafeteria impressive and in commercial restaurant. Third the separation of service circulation serveries and eating area is necessary. Fourth material for each parts should be easy to maintain and durable. Fifth more illuminance that the regulation is recommended and lighting fixture should be selected in terms of economics and maintenance. Sixth selecting bright and warm colors with partial application of accent colors is effective. Seventh furniture should be harmonized with the ambience of the space and required to be convenient and durable. Eighth to provide visual and auditory pleasure during eating it is desirable to equip the minimal A/V system. In addition diverse aspects such as improving employee's welfare caring for company the way of treating employee an boosting corporate images should be considered when designing staff's cafeteria and interior designer should be able to satis managerial aspects productivity and effectiveness as well as pursuing functional aesthetic facts.

• KIEAE Journal
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• 제13권6호
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• pp.55-65
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• 2013

Korean Government has developed Sejong City as a new administration city. This city of future was planned and designed toward one of the most eco-friendly city on the basis of ICTs. To attain this object, a carbon emission monitoring system (CEMS) was designed and installed as a part of u-city service which provides various information anytime and anywhere to enrich the people's quality of life. In this paper, at first, the structure and functions of CEMS are introduced. This system is consist of 5 parts - data collection from user and linked public DBs, transforming data into meaningful information for the policy makers, system-user interfacing via statistical tables and graphs, and system maintenance. This system can be operated by the citizen participation through whole the process. With the help of GIS map and graphic interface, statistics of monitored data for both citizen and decision maker provided and after feed-back, they have affected on the behaviour of citizen's energy consumption and related policy as well. By the CEMS, energy consumption data of 124 agreed households were collected during 9 months in 2012. Electricity, gas and water consumption were remote-metered automatically by the system and analysed. This showed that more than 85% of CO2 emission is rely on electricity usage. Furthermore, number of family members and size of house influences on the emission of CO2 by each household together with the life-style of the occupants. Electricity and water consumption showed the seasonal factor while gas consumption represents the number of family members. Even this paper has limitations caused by 9 months of data collection, it shows the policy directions to reduce the emission of CO2 focusing on the house size and number of family members of each households. With the result of this research, life-style of the generation of dwellers should be investigated and the CO2 emission characteristics of other housing type as well for the data building for future policy making.

• 한국전자파학회논문지
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• 제7권3호
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• pp.219-229
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• 1996

육상 이동통신의 서비스 범위 예측에 가장 기본이 되는 전송 손실 계산 방식은 그 적용범위 및 모델도출 방법에 따라 많은 발전을 거듭하여 왔다. 그러나, 전파는 이것이 지나가는 환경, 즉 빌딩의 특성이나, 나무, 그리고 지형형태 등에 의해 너무나 많은 영향을 받으므로 미국,일본 동 외국의 환경에서 만들어져 국내에 도입된 전파 예측모델들은 우리나라의 실정에 적합하지 않는 점이 많다. 본 논문에서는 국내 지형을 분석하여 그 특성에 따라 여섯가지의 종류로 분류하고 각각에 해당하는 국내 지역을 선정하여 무선호출 주파수 대역에서 전계강도 측정을 수행하였다. 또한, 이 측정 데이타를 이용한 실험식과 함께 산악지역에서의 회절 계산식을 포함하여 가시거리 및 비가시거리를 구분하여 전계강도를 계산하는 예측모델을 만들었다. 제안된 모델을 국내 지형 데이타 베이스와 연결하여 전계강도 예측을 수행한 값과 실측된 데이타와 비교한 결과, 최소 3dB에서 최고 9dB 정도로 오차가 나타났으므로 실용성이 있을 것으로 판단된다.

• 한국동물위생학회지
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• 제41권1호
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• pp.41-45
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• 2018

An 11 year-old male Korean short-haired cat was presented to local animal hospital due to weight loss, vomiting, and intestinal hypomotility. After the cat was euthanized by poor clinical outcomes, necropsy was performed at Animal and Plant Quarantine Agency. At necropsy, the stomach was enlarged and had some nearly complete pellet food and the yellow mucous contents. The lumen of the middle and lower parts of the jejunum became narrow. Histopathologically, medium-sized lymphoid cells with hyperchromatic nuclei enclosed by scant cytoplasm were diffusely proliferated from mucosa to serosa of the small intestine. These findings were mainly observed in the jejunum and slightly in the duodenum and ileum. The monomorphous lymphocytes were 1 to 1.5 times larger than red blood cells and had few mitotic figures. Metastasis of the tumor cells to other organs was not observed. In the result of immunohistochemical analysis for identifying the origin of tumor cells, CD3 was expressed, but $CD79{\alpha}$ was not detected in the infiltrated cells. This case was diagnosed as T cell intestinal lymphoma in a Korean short-haired cat based on the clinical signs, gross findings, histopathology, and immunohistochemistry.

• 대한화학회지
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• 제65권6호
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• pp.433-440
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• 2021

계면활성제는 하나의 분자에 친수성 작용기와 소수성 부분이 동시에 존재하는 유기화합물로 수용액 상태에서 전하에 따라 비이온, 음이온, 양이온, 양쪽성 계면활성제로 분류된다. 1종 세척제(야채 및 과일 세척제)를 사용하여 야채나 과일을 세척할 때 극미량이 잔류하여 섭취를 통해 인체에 노출될 가능성이 있는 것으로 알려져 있다. 본 연구는 세척제를 사용한 야채, 과일의 세척 후 세척제 잔류량 분석을 위해 LC-MS/MS를 이용한 계면활성제 5종 동시분석법을 확립하였다. 이동상으로는 50 mM 암모늄 포메이트와 0.1% 폼산이 함유된 증류수와 아세토니트릴을 사용하였으며, XBridge BEH C8 컬럼을 이용하여 경사용매조성법으로 분석하였다. 확립된 분석법의 정확도는 83.9~112.1% 이었고, 정밀도는 20% 이하로 정밀한 값을 보였다. 검출한계는 7.0(SLS)~29.0(SLES-N3) ㎍/L이었고, 검량선 회귀식의 상관계수(r²)은 0.99 이상으로 우수한 직선성을 보여주어 야채 및 과일에 잔류하는 미량의 계면활성제 성분의 분석에 적합한 것으로 판단된다.

• 디자인융복합연구
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• 제16권3호
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• pp.51-68
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• 2017

디자인에 있어서 소비자의 의견과 경험을 중시하는 사용자중심 디자인, 경험디자인이 부각되면서 디자인 개발 과정에 롤플레잉 기법이 적극 활용되고 있는 추세이다. 그러나 이러한 니즈를 충족시켜 주는 롤플레잉 형식의 방법론들은 다양한 이름으로 흩어져 있으며 진행방식이 규정되어 있지 않아 디자인 개발 과정에서 사용하기에 용이하지 않다. 따라서 본 연구에서는 롤플레잉의 개념정의 연구와 실험 연구로 나누어 첫 번째, 개념 정의 연구에서는 정의와 진행방식이 유사한 넓은 범위의 롤플레잉에 해당하는 방법을 모두 찾아 종합하여 롤플레잉의 개념과 범위를 규정하였다. 이후 롤플레잉 방법들의 사례를 분석하여 차이점을 통해 배역·시나리오와 퍼펫 유/무, 두 가지 축을 가진 롤플레잉 분류 매트릭스를 도출하였으며, 매트릭스의 영역별 롤플레잉의 기법의 장단점 분석을 통해 더블 다이아몬드 모델에 대입하여 롤플레잉 활용 영역을 제안하였다. 두 번째, 본 논문의 실험연구 부분에서는 총 두 개의 실험을 진행하였으며 그 중 탐색적 실험으로 진행된 Pilot 롤플레잉을 통해 본 논문의 주제인 롤플레잉 방법의 연구 가능성을 발견하였다. 이후 선행연구를 통해 도출된 매트릭스를 활용하여 롤플레잉 본 실험을 진행하였으며, 롤플레잉의 기법 별로 얻을 수 있는 제품/서비스의 측면과 사용자 인지 요소가 다르다는 사실을 발견하였다. 두 실험을 통하여, 롤플레잉은 제품과 서비스의 개선점과 인사이트를 다양한 시점에서 파악하기에 용이하다는 점을 실증적으로 입증하였으며, 서비스 유형이나 개발 단계에 따라 선택적으로 활용할 수 있는 롤플레잉 활용 기법을 도출하였다.

• 농약과학회지
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• 제15권3호
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• pp.246-253
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• 2011

재배형태별(노지, 비가림 하우스)로 고추의 재배에 사용되는 carbendazim과 chlorpyrifos의부위별 잔류량에 대해 조사를 하였다. carbendazim과 chlorpyrifos 모두 농약 살포 2시간 후에는 비가림하우스보다 노지에서 잔류량이 높았으며, 시일이 경과한 5일과 10일 후에는 오히려 비가림하우스에서 높았다. 노지에서 초기 농약잔류가 비가림하우스보다 높음에도 불구 하고 농약의 분해가 더 빨랐다. 시간이 경과하여 5일차에는 carbendazim이나 chlorpyrifos은 과탁/과경 > 과경/과탁 > 과육의 순으로 농약 잔류가 높았으며, 잎의 농약잔류량은 다른 부위보다 아주 높았다. carbendazim과 chlorpyrifos의 경감율은 수확이 늦추어짐에 따라 감소되지만, 10일차에 과육에서 19.1%와 66.4%, 과탁에서 45.2%와 62.3%, 그리고 과경에서 41.6%와 72.0%로 각각 나타났다. 또한 15일차의 경감율은 과육에서 31.1%와 75.3%, 과탁에서 43.5%와 81.7%, 그리고 과경에서 47.7%와 82.8%로 나타났다. 따라서 carbendazim은 과탁 > 과경 > 과육의 순으로, chlorpyrifos는 과경 > 과탁 > 과육의 순으로 경감율을 보였다. 잔류량 반감기는 carbendazim에서 과육은 29.6일, 과탁은 13.6일, 과경은 16.0일 이었고, chlorpyrifos에서는 과육 8.3일, 과탁 8.3일, 과경 6.3일로 나타났다. 이와 같이 침투성농약인 carbendazim이 chlorpyrifos보다 반감기가 모든 부위에서 길었으며, 부위별로는 두 성분 다 과육에서 반감기가 긴 것으로 나타났다.