• 한국해양공학회지
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• 제22권3호
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• pp.96-102
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• 2008

As LNG tank is operated around $-162^{\circ}C$, an experimental approach on the cryogenic temperature tensile and fatigue strengths of SUS304L lap joint weld is very important at the design stage of membrane type LNG tank. In this study, in order to estimate the tensile and fatigue strengths of SUS304L lap joint weld at cryogenic temperature condition, tensile and fatigue tests were conducted. Also, S-N curves are presented with statistical testing method recommended by JSME. As a result of the experimental approach, the d￡sign guide of fatigue strength is proposed and that is expected to be useful for membrane type LNG tank design.

• 임상간호연구
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• 제16권3호
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• pp.175-186
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• 2010

Purpose: Delirium can be a highly prevalent symptom in intensive care units but it may still be under-recognized despite its relation with inclined morbidity, mortality, cost, and readmission. Therefore, this study aimed to develop a protocol that covers risk factors and non-pharmacological interventions to prevent delirium in ICU patients. Methods: This study was conducted using methodological design, and it followed the Scottish Intercollegiate Guideline Network (SIGN) guideline development steps: 1) the scope of protocol was decided (population, intervention, comparison, and outcomes); 2) guidelines, systematic reviews, and protocols were reviewed and checked using methodology checklist; 3) the level of evidence and recommendation grades was assigned; 4) the appropriateness of recommendations was scored by experts; 5) the final protocol & algorithm was modified and complemented. Results: The evidence-based delirium prevention protocol was completed that includes predisposing factors, precipitating factors and recommendations with evidenced grades. Conclusion: This protocol can be used as a guide nurses in screening patients with high risk factors of delirium as well as in intervening the patients non-pharmacologically to prevent delirium.

• 한국환경생태학회지
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• 제10권1호
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• pp.14-23
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• 1996

내장산 국립공원의 이용객 행태조사는 1995년 10월 31일부터 11월 3일까지 실시되었고 총 151명의 이용객이 참여하였다. 이용객의 사회경제적 특성으로는 남자가 55%, 여자가 45%로 나타났으며, 교육정도는 대졸 이상이 52%로 높게 나타났다. 연령별로는 20대가 61.3%로 가장 높게 나타났다. 응답자의 가을철 내장산 국립공원의 방문목적은 주로 단풍감상을 위한 것으로 나타났다. 이용객 대부분은 이용정보를 안내판을 통해서(31.8%), 또는 그들 스스로 알아서(29.1%)획득하는 것으로 나타났다. 또 이들 대부분은 Clean-up Time 운동에 대해 알지 못하고 있었고, 현수막을 본 후에 인식하게 된 것으로 나타났다. 대부분의 이용객은 내장산에서 안내방송을 듣지 못했다고 응답한 반면, 국립공원에서 안내방송의 필요성에 대해서는 깊이 공감하는 것으로 나타났다. 이러한 결과들은 Clean-up Time 운동의 쓰레기 투기행위 관리효과에 대해 내장산 국립공원을 방문한 이용객들이 긍정적으로 인식하고 있다는 점을 나타내는 것으로 판단된다. 이러한 점에서 국립공원에 있어서 대중매체를 이용한 훼손행위 관리기법의 도임은 많은 효과를 가져다줄 것으로 기대된다.

• Tuberculosis and Respiratory Diseases
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• 제84권4호
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• pp.282-290
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• 2021

Background: Radial probe endobronchial ultrasound-guided transbronchial lung biopsy (RP-EBUS-TBLB) has improved the diagnostic yield of bronchoscopic biopsy of peripheral pulmonary lesions (PPLs). The diagnostic yield and complications of RP-EBUS-TBLB for PPLs vary depending on the technique, such as using a guide sheath (GS) or fluoroscopy. In this study, we investigated the utility of RP-EBUS-TBLB using a GS without fluoroscopy for diagnosing PPLs. Methods: We retrospectively reviewed data from 607 patients who underwent RP-EBUS of PPLs from January 2019 to July 2020. TBLB was performed using RP-EBUS with a GS without fluoroscopy. The diagnostic yield and complications were assessed. Multivariable logistic regression analyses were used to identify factors affecting the diagnostic yields. Results: The overall diagnostic accuracy was 76.1% (462/607). In multivariable analyses, the size of the lesion (≥20 mm; odds ratio [OR], 2.06; 95% confidence interval [CI], 1.27-3.33; p=0.003), positive bronchus sign in chest computed tomography (OR, 2.30; 95% CI, 1.40-3.78; p=0.001), a solid lesion (OR, 2.40; 95% CI, 1.31-4.41; p=0.005), and an EBUS image with the probe within the lesion (OR, 6.98; 95% CI, 4.38-11.12; p<0.001) were associated with diagnostic success. Pneumothorax occurred in 2.0% (12/607) of cases and chest tube insertion was required in 0.5% (3/607) of patients. Conclusion: RP-EBUS-TBLB using a GS without fluoroscopy is a highly accurate diagnostic method in diagnosing PPLs that does not involve radiation exposure and has acceptable complication rates.

• 대한교통학회지
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• 제26권5호
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• pp.195-204
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• 2008

운전자가 도로를 주행하면서 안내표지판을 인지하고 원하는 목적지로 잘 도착할 수 있도록 하기 위해서는 인적요소, 표지판의 요소, 기하구조 등 여러 가지 원인이 잘 조화되어 운전자를 이끌어야 한다. 본 연구의 목적은 운전자가 표지판을 정확하게 인지하고 다음 목적지로 갔는지를 알아보기 위해서 성공여부(성공0, 실패1)의 개념을 사용하여 도로표지의 지명 판독과정에서 영향을 미치는 인자를 규명하는 것이다. 운전자의 인적요소, 표지판 요소 등을 고려하였으며, 도로주행시뮬레이터(driving simulator)를 이용하여 도로표지의 지명 판독과정에서 안전운행에 영향을 미치는 인자에 대한 통계 분석을 실시하였다. 통계적 분석은 선정된 변수를 토대로 Logistic Model을 이용하여 성공여부에 대한 확률식을 제시하였다. 본 연구의 결과는 도로표지 설계 및 설치에 있어서 도로 이용자에게 보다 좋은 시설이 될 수 있도록 하는데 기초자료로 활용될 수 있을 것이다.

• Journal of Positioning, Navigation, and Timing
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• 제6권4호
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• pp.159-166
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• 2017

The position of autonomous driving vehicle is basically acquired through the global positioning system (GPS). However, GPS signals cannot be received in tunnels. Due to this limitation, localization of autonomous driving vehicles can be made through sensors mounted on them. In particular, a 3D Light Detection and Ranging (LIDAR) system is used for longitudinal position error correction. Few feature points and structures that can be used for localization of vehicles are available in tunnels. Since lanes in the road are normally marked by solid line, it cannot be used to recognize a longitudinal position. In addition, only a small number of structures that are separated from the tunnel walls such as sign boards or jet fans are available. Thus, it is necessary to extract usable information from tunnels to recognize a longitudinal position. In this paper, fire hydrants and evacuation guide lights attached at both sides of tunnel walls were used to recognize a longitudinal position. These structures have highly distinctive reflectivity from the surrounding walls, which can be distinguished using LIDAR reflectivity data. Furthermore, reflectivity information of tunnel walls was fused with the road surface reflectivity map to generate a synthetic reflectivity map. When the synthetic reflectivity map was used, localization of vehicles was able through correlation matching with the local maps generated from the current LIDAR data. The experiments were conducted at an expressway including Maseong Tunnel (approximately 1.5 km long). The experiment results showed that the root mean square (RMS) position errors in lateral and longitudinal directions were 0.19 m and 0.35 m, respectively, exhibiting precise localization accuracy.

• 한국안전학회지
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• 제27권6호
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• pp.185-191
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• 2012

Rear collisions to expressway work trucks result many casualties these days. But, currently, no special measure are being taken except deploying sign trucks behind the working trucks. In the U.S and Europe, trucks with TMA(Truck Mounted Attenuator) are being deployed behind the working truck, which is regarded as the standard method for work area safety, thereby reducing the fatality rates and property damage tremendously. Also, standard for the performance of TMA are established and TMA can be used in the field only when it satisfies the standard. In Korea, neither the standard for nor any guide to the TMA exists. In the situation some manufacturer developed TMA without proper performance evaluation and marketed limited number of TMAs in the field. In the study, NCHRP350, which is the performance standard of expressway safety features of U.S. and materials related to the TMA standard in Europe have been reviewed to establish the Korean performance criteria. Based on the review, and incorporating existing Korean standard for crash cushions, domestic standard for TMA has been proposed and applied in developing Korean TMA and crash tested it to verify the performance. The original design developed was crash tested and modified. The newly proposed design was studied using impact simulation program several times. Modifications were made after each simulation and prototype was built and crash tested as per the newly established TMA performance criteria.

• 대한치과보철학회지
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• 제36권2호
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• pp.245-257
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• 1998

This study was performed to measure the changes of the mandibular movement and the masticatory muscular activities - anterior temporal and masseter muscle of both side - reflected by intentional increase of anterior guidance angie. For this study, 5 volunteers (3 males and 2 females with average age of 24.0) were selected. Each volunteer had Angle's classification I and did not have any missing tooth except third molar and any extensive restorations. Metallic guide plate was made at volunteer's working model fabricated by improved dental stone and cemented to the palatal surface of maxillary central incisor using resin cement(Panavia $21^{(R)}$) and then adjusted not to give any occlusal interferences at intercuspal position. The activity of masticatory muscles and the changes of mandibular movement were recorded by EMG and Sirognathograph in Biopak analysing system(Bioresearch Inc., Milwaukee, Wisconsin, USA). Measurement was done at before experiment, immediatley after placement, 1 week after placement, immediately after removal, and 1 week after removal. The results were as follows: 1. Moderate phonetic disturbance and mild headache were occured to 3 volunteers for 2 days after setting and 1 volunteer had positive reaction to percussion and slight midline diastema. But all of these clinical signs were diappeared 1 week after removal and the other volunteer did not have any special clinical sign. 2. In the EMG of the mandibular rest position, the mean value of anterior tempotal muscle was increased immediately after placement(p<0.01) and then decreased 1 week after placement(p<0.05) and increased 1 week after removal(p<0.05) but not recovered as before experiment. The mean value of masseter muscle was decreased during the experiment period. 3. In the EMG during mandibular protrusive movement, all muscular activity was decreased during the experiment period. Reduced activity was not recovered 1 week after removal(p<0.03). 4. During the habitual opening, anteroposterior movement of mandible was decreased immediately after placement(p<0.05) and then increased 1 week after placement but not statistically significant(p>0.1). Vertical movement was not shown significant difference during the experiment period(p>0.1). Lateral movement was decreased immediately after placement(p<0.05) and then increased 1 week after placement but not recovered as before experiment. The opening and closing velocity of mandible was shown minor changes but not statistically significant. 5. During the habitual opening, anteroposterior movement of mandible was decreased 1 week after placement(p<0.05) and then increased immediately after removal and recovered 1 week after removal as before experiment. Vertical movement was not shown significant changes. Lateral displacement of mandible was increased continuously and recovered 1 week after removal. Opening velocity was temporarily increased immediately after removal but recovered and closing velocity was not shown significant changes. 6. During the right side chewing, anteroposterior movement of mandible was increased immediately after removal but recovered and vertical movement was not shown statistically significant results. Lateral displacement and velocity of mandible were not shown significant results. 7. During the left side chewing, the changes of mandibular movement pattern were not shown statistically significant results.

• 감성과학
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• 제20권1호
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• pp.17-30
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• 2017

하이테크놀로지를 여러 가지 다른 영역과 융합하고자 하는 노력이 다양한 연구 분야에서 시도되고 있으며, 스포츠웨어를 개발함에 있어 운동선수의 운동능력을 향상시키기 위한 분야에 이러한 첨단 기술들이 도입되고 있다. 본 연구는 스포츠 훈련에 도움이 되는 동작 센싱 스마트 스포츠웨어를 개발하기 위한 기초 연구로서, 조정 동작 시 관절의 움직임을 측정할 수 있는 동작 센서를 부착하기 위한 인체상의 최적 위치를 탐색하는 것을 목적으로 한다. 본 연구에서는 일관된 동작을 반복적으로 수행할때 관절의 변화가 큰 조정을 대상 스포츠로 선정하였으며, 조정 선수의 대표 체급인 중량급과 경량급의 피험자를 선정하여 동작에 따른 피부의 변화율을 측정하여 체급별 차이를 분석하였다. 먼저, 3차원 모션캡처 시스템을 이용하여 조정 동작 시 등, 팔꿈치, 엉덩이, 무릎 부위의 피부 변화를 촬영하고, 각 마커 간 거리의 변화율을 분석함으로써 체급에 따른 차이를 보이지 않으면서 동작에 따라 피부의 변화가 큰 부분을 인체 상에 도시하였다. 이를 바탕으로 동작 센싱용 스마트 스포츠웨어를 위한 센서 부착의 가이드라인을 제시하였다.

• 수산경영론집
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• 제40권2호
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• pp.105-126
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• 2009

This study applies the cointegration theory to analyse the causality of the prices between imported fisheries and domestic fisheries in distribution channel. We've focused on the prices of import, wholesale and retail about the frozen Alaska pollack, hairtail and croaker which take up high portion and are popular among most of the consumers. In process of analysis, the unit root test was adopted to find the stability of time series data prior to the cointegration test. If the time series data was found as stable one in unit root test, we should analyse the VAR model. If unstable, the cointegratioin test was adopeted to find the long-run equilibrium relationship between the data. When the long-run equilibrium relationship was found among the price of the import, wholesale and retail price, the VECM model was adoped. If not, the differenced VAR model was adopted. The main findings of this study could be summarized as follows ; First, according to the result of the analysis on VAR model, time series data of frozen Alaska pollack was found as stable and has causality relationship and close effect was existing among the import, wholesale and retail price. Second, the data of frozen hairtail was found as an unstable one in unit root test and the result of cointegration test showed the long-run equilibrium relationship at lag 1. From the results of VECM model, we could find that the coefficient of error correction is effective, and the sign is negative(-). It means that the existence of adjustment tendency to long-run equilibrium after a short-run deviation. But the short-run causality of the prices were not found except the price of wholesale. Third, according to the results of differenced VAR model, data from frozen croaker did not have the stability and long-run equilibrium. Moreover, it was found that the import price has a weak causality on the retail price. Because of having difficulties in collecting data, the result of this paper could not explain the relationship among the prices of import, wholesale and retail perfectly. However, it more or less contributed to a long-lasted debate on the direction of causality of price-setting in academic research and provided a useful guide for the policy makers in charge of the price-setting of fisheries products as well.