본 연구는 지역 고용 회복력에 대한 이론적 개념과 정책 적용 가능성 을 통합적으로 고찰하였다. 이를 위해 회복력 개념의 유형과 진화를 정 리하고, 고용 수준의 회복 속도뿐 아니라 구조적 전환과 경로 변화까지 포착할 수 있는 측정 방식(민감도 분석, 국가벤치마크 비교, 동태적 변이 할당 분석)을 비교·정리하였다. 특히 산업 구조의 다각화, 정책 개입의 시의성, 지역 주체의 제도적 역량을 핵심 요인으로 포함하는 다층적 분 석 틀을 제시하였다. 이 틀을 바탕으로, 유럽연합(EU)의 Cohesion 정책 사례를 분석하여 회복력 중심 정책 설계의 세 가지 원칙-① 사전 예방적 대응, ②다층적 거버넌스, ③ 장기 전략 수립-을 도출하고, 이를 한국의 고용위기지역 정책과 비교하여 제도적 한계와 개선 방향을 진단하였다. 특히, 한국 정책의 중앙집중성과 단기 대응 구조가 지역의 회복 역량 형 성에 제약이 됨을 비판적으로 검토하고, 지역 단위 전략 수립, 과정성과 구조적 조건을 반영한 복합 지표 체계, 산업전환을 위한 지역 경로 개척 전략의 실증 적용 가능성을 제안하였다.

A high-pressure in-situ permeation measuring system was developed to evaluate the hydrogen permeation properties of polymer sealing materials in hydrogen environments up to 100 MPa. This system employs the manometric method, utilizing a compact and portable manometer to measure the permeated hydrogen over time, following high-pressure hydrogen injection. By utilizing a self-developed permeation-diffusion analysis program, this system enables precise evaluation of permeation properties, including permeability, diffusivity and solubility. To apply the developed system to high-pressure hydrogen permeation tests, the hydrogen permeation properties of ethylene propylene diene monomer (EPDM) materials containing silica fillers, specifically designed for gas seal in high-pressure hydrogen environments, were evaluated. The permeation measurements were conducted under pressure conditions ranging from 5 MPa to 90 MPa. The results showed that as pressure increased, hydrogen permeability and diffusivity decreased, while solubility remained constant regardless of pressure. Finally, the reliability of this system was confirmed through uncertainty analysis of the permeation measurements, with all results falling within an uncertainty of 11.2 %.

AlN thin film is highly valued for use as a high-temperature material because of its excellent heat resistance, thermal conductivity and high mechanical strength. In addition, it is known as a replacement material for ZnO, because it can be applied to surface acoustic wave elements and high-frequency filters using piezoelectric properties or sound velocity. In this study, an alternating sputtering method was used to fabricate an AlN thin film with excellent film quality. The c-axis orientation and residual stress of the fabricated AlN thin film were measured using an X-ray diffraction method. Nitrogen gas pressure and target electrode conversion time are important deposition conditions when producing a thin film using the alternating sputtering method. The AlN thin film fabricated on the glass substrate using the alternating planar magnetron sputtering method exhibited a crystal structure in which the c-axis was preferentially oriented in the normal direction of the substrate surface. The c-axis orientation was better when the target electrode switching time was short under the condition of low nitrogen gas pressure. Residual stress is tensile stress in the very low nitrogen gas pressure range (PN ≤ 0.3 Pa), compressive stress in the low nitrogen gas pressure range (0.3 < PN < 0.9 Pa), and in the high nitrogen gas pressure range (PN ≥ 0.9 Pa), it becomes tensile stress. Residual stress shows tensile stress when the switching time is short, tensile stress decreases as the switching time increases, and becomes compressive stress when the switching time is sufficiently long (300 to 600 s). Compared to the simultaneous sputtering of two targets, the use of the alternating sputtering method can produce a high-quality thin film with excellent c-axis orientation and low residual stress.

Gas sensors play a crucial role in monitoring harmful gas concentrations and air quality in real-time, ensuring safety and protecting health in both environmental and industrial settings. Additionally, they are essential in various applications for energy efficiency and environmental protection. As the demand for hydrogen refueling stations and hydrogen fuel cell vehicles increases with the growth of the hydrogen economy, accurate gas concentration measurement technology is increasingly necessary given hydrogen's wide explosion range. To ensure safety and efficiency, gas sensors must accurately detect a wide range of gas concentrations in real-world environments. This study presents two types of gas sensors with high sensitivity, stability, low cost, fast response time, and compact design. These sensors, based on volume and pressure analysis principles, can measure gas filling amounts, solubility, diffusivity, and the leakage of hydrogen, helium, nitrogen, and argon gases in high-density polyethylene charged under high-pressure conditions. Performance evaluation shows that the two sensors have a stability of 0.2 %, a resolution of 0.12 wt･ppm, and can measure gas concentrations ranging from 0.1 wt･ppm to 1400 wt･ ppm within one second. Moreover, the sensitivity, resolution, and measurement range of the sensors are adjustable. Measurements obtained from these sensors of gas filling amounts and the diffusivity of four gases showed consistent results within uncertainty limits. This system, capable of real-time gas detection and characterization, is applicable to hydrogen infrastructure facilities and is expected to contribute to the establishment of a safe hydrogen society in the future.

Springtails (class Collembola) play a crucial role in soil ecosystems. They are commonly used as standard species in soil toxicity assessments. According to the ISO 11267 guidelines established by the International Organization for Standardization (ISO), Allonychiurus kimi uses adult survival and juvenile production as toxicity assessment endpoint. Conventional toxicity assessment methods require manually counting adults and larvae under a microscope after experiments, which is time-consuming and laborintensive. To overcome these limitations, this study developed a model using YOLOv8 to detect and count both adults and juveniles of A. kimi. An AI model was trained using a training dataset and evaluated using a validation dataset. Both training and validation datasets used for AI model were created by picturing plate images that included adults and larvae. Statistical comparison of validation dataset showed no significant difference between manual and automatic counts. Additionally, the model achieved high accuracies (Precision=1.0, Recall=0.95 for adults; Precision=0.95, Recall=0.83 for juveniles). This indicates that the model can successfully detect objects. Additionally, the system can automatically measure body areas of individuals, enabling more detailed assessments related to growth and development. Therefore, this study establishes that AI-based counting methods in toxicity assessments with offer high levels of accuracy and efficiency can effectively replace traditional manual counting methods. This method significantly enhances the efficiency of large-scale toxicity evaluations while reducing researcher workload.

목적 : 본 연구는 안경 처방에 필요한 매개변수를 분석하여 정확하고 편안한 안경 처방을 위한 객관적 자료를 제시하는 것이다. 방법 : 20세 이상 성인 41명(남자: 28명, 여자: 13명)을 대상으로 사진, 트르뷰 아이, 안경자 및 스마트 센터링 장치 계측법을 이용하여 단안 동공 거리, 동공간거리, 광학중심점높이, 경사각, 안면각 및 정점간거리를 계측하고, 사진 계측법을 표준으로 정확도(오차)를 비교하였다. 또한, 오차 보정 식을 통하여 임상에서 적용하기 위한 보정 값 을 산출하였다. 결과 : 4가지 장비의 계측법을 비교했을 때 광학중심점높이와 경사각, 안면각 및 정점간거리는 유의한 차이가 있었다(p<0.050). 사진 계측법을 표준으로 한 보정 값에서 트르뷰 아이는 단안 동공 거리, 동공간거리, 광학중심점 높이, 경사각, 안면각 및 정점간거리의 상관계수가 높고 통계적으로 유의하였다(p<0.050). 안경자는 단안 동공 거 리, 동공간거리, 광학중심점높이 및 정점간거리는 상관계수가 높고 통계적으로 유의하였다(p<0.050). 스마트 센터 링 장치는 안면각에서 통계적으로 유의하였다(p<0.050). 보정 값에 대한 95% 신뢰구간은 단안 동공 거리에서 스마 트 센터링 장치가 좁은 범위와 적은 편차를 보였고, 다른 모든 매개변수는 트르뷰 아이에서 좁게 나타났고, 평균값 의 편차도 가장 적었다. 결론 : 4가지 측정 장비를 이용하여 안경 처방에 필요한 매개변수를 측정한 결과 측정 방법에 따라 차이가 있었 고, 임상에서 사진 측정값을 대신하여 적용할 수 있는 보정 값을 제시하였다.

목적 : 본 연구는 사진 계측법과 스마트 센터링 장치 계측법을 사용하여 누진 굴절력 렌즈 처방을 위한 누진대 길이와 매개변수 측정에 활용할 수 있는 자료를 제공하고자 하였다. 방법 : 사진 계측 장치를 이용하여 누진 굴절력 렌즈 처방에 필요한 매개변수인 광학 중심점 높이, 정점 간 거 리, 경사각, 안면각을 측정하였다. 또한 근거리 작업 자세를 분석하여 누진대 길이 처방에 참고 값으로 활용할 수 있는 하방 안구 이동량을 산출하였다. 이후 측정한 매개변수와 하방 안구 이동량을 스마트 센터링 장치를 이용하여 측정한 값과 비교하였다. 결과 : 원거리 및 근거리에서 나안으로 광원을 인지할 수 있는 시력 이상의 성인 남녀 25명을 대상으로 하였다. 사진 계측법을 이용하여 산출한 하방 안구 이동량은 평균 10.12±3.33 mm로 측정되었으며, 작업 거리가 짧아질수 록 길게 측정되었다(r=-0.418, p<0.050). 사진 계측법과 스마트 센터링 장치 측정법의 매개변수 측정값을 비교한 결과, 원거리 및 근거리 작업 거리에서 단안과 양안의 동공 중심 간 거리와 안면각은 통계학적으로 유의한 차이가 없었으나(p>0.050) 수직적인 머리 움직임에 영향을 많이 받는 광학 중심점 높이, 정점 간 거리, 경사각은 유의한 차이가 있었다(p<0.050). 하방 안구 이동량은 스마트 센터링 장치로 측정한 값이 9.67±1.99 mm로 사진 계측법 으로 측정한 값보다 0.46±3.35 mm 더 작게 측정되었으나, 통계학적으로 유의한 차이는 없었다(p>0.050). 결론 : 본 연구는 근거리 작업 자세와 하방 안구 이동량을 분석하고 사진 계측법과 스마트 센터링 장치 측정법 을 비교하여 누진 굴절력 렌즈 처방에 필요한 누진대와 매개변수 측정에 대한 기초 자료를 제시하였다.

This study aimed to measure the in-situ target strength (TS) of the moon jellyfish (Aurelia aurita) using a 200 kHz scientific echo sounder in a natural coastal environment. The acoustic survey was conducted in the coastal waters of Soho Port, Yeosu, Korea, from June 4 to 5, 2024. TS measurements were performed by installing the transducer in both horizontal and vertical orientations, and the TS distribution characteristics were analyzed. The measured TS values ranged from -89.8 to -64.8 dB in the horizontal direction and from -90.0 to -59.1 dB in the vertical direction, showing no significant difference between detection orientations (p<0.05). Additionally, a bell diameter-wet weight relationship for Aurelia coerulea was derived based on the specimens collected at the survey site. The empirical TS model proposed by Mutlu (1996) was applied to estimate TS values using the measured morphological data, and the results exhibited a similar trend to the field-measured TS distribution. These findings provide fundamental data for acoustic monitoring and stock assessment of jellyfish populations in natural environments.

매립가스 표면발산량 조사 결과의 신뢰도와 측정지점 수의 적정성 평가를 위해 수도권 제2매립 장을 대상으로 중심극한정리와 t-검정을 이용하여 분석하였다. 3개의 표면발산 경로별 flux에서 매립가스 보다 메탄의 상대편차가 훨씬 크게 나타났으며, 계절별로는 두 경우 모두 여름철 상부가 각각 409%, 1,174%로 가장 컸다. 상대오차도 메탄의 값이 전반적으로 컸으며, 4계절 평균시 여름철 메탄이 182.7%로 가장 크고, 매립가스의 봄과 겨울철이 33.0% 내외로 가장 작았다. 20%의 상대오차를 허용할 때 현장 측정 지점 수는 모두 적정 수 대비 100% 미만이었으며, 특히 메탄이 매우 낮았다. 표면발산량이 가장 큰 상부의 경우 측정지점 수의 만족도는 봄부터 겨울까지 매립가스는 각각 26.1%, 9.8%, 17.9%, 22.6% 그리고 메탄 은 각각 2.7%, 1.2%, 5.9%, 3.2%에 불과하였다. 연구결과 매립가스 표면발산량 조사시에 현재의 챔버 방 식은 신뢰도 확보에 한계가 있으므로 대체 조사방법에 대한 연구가 필요할 것으로 판단되었다.

A technology was developed to measure the hydrogen uptake and diffusivity of polymer materials used in high-pressure hydrogen tanks and pipelines at hydrogen refueling stations. This technology involves charging hydrogen into polymer under a maximum pressure of 90 MPa, followed by depressurization. The polymer material is then placed in a cylinder partially submerged in water, and hydrogen is released from the material. The increase in volume of the released hydrogen causes a decrease in the water level in the cylinder. To track this in real-time, an image analysis algorithm based on the brightness of a crescent-shaped water level image is used to accurately measure the water level and change in hydrogen amount at the same time. This data is then used in a self-developed diffusivity analysis program to evaluate hydrogen uptake and diffusivity. Using this technology, the hydrogen uptake and diffusivity of sulfur-crosslinked nitrile butadiene rubber (NBR) composites containing carbon black and silica fillers were measured from 2 to 90 MPa. Additionally, the relationship between the physical stability of the NBR composites and their hydrogen uptake and diffusivity was investigated. To validate the effectiveness of the technology, an uncertainty analysis of the measurements was conducted, with all results showing an uncertainty within 8 %.

This study investigated the occurrence and morphological characteristics of Polyphylla laticollis manchurica adults in the Miho River, Cheongju, from June to August 2024. Surveys were conducted at five sites along a 14 km stretch from upstream of Palgyeol Bridge to downstream of Oksan Bridge, including three sites along the main river and two sites in tributaries. No P. laticollis manchurica adults were found at the tributary sites. A total of 107 adults were recorded at site C and D, with peak occurrence observed between June 20 and August 4, 2024. The first occurrence date was recorded in June 20, the peak occurrence on July 5, and the last observation on August 4. The morphological measurements of the adults attracted by light trap were as follows: body length 33.38±1.68 mm; body width 16.02±1.00 mm; and body weight 1.45±0.32 g. The sex ratio (male : female) was 7.14 : 2.86. While no significant differences were observed in body length and width between males and females, females were significantly heavier during the third survey period. Most adults attracted to artificial light were males, and several dead individuals were found near streetlights and bridge. This study provides fundamental data on the occurrence period, habitat distribution, and phototactic behavior of P. l. manchurica, contributing to a better ecological understanding and conservation efforts for this endangered species.

목적 : 본 연구에서는 회절격자가 광원의 깊이에 따라 회절영상을 주기적으로 생성하는 광학적 특성을 이용하여 중간 범위의 깊이를 측정할 수 있는 시스템을 연구하였다. 방법 : 첫 번째로 회절격자 영상시스템을 기하광학적으로 분석합니다. 두 번째로 회절격자의 주기적인 결상특성 을 파동광학적으로 분석하였다. 세 번째로 주기적인 함수사이의 콘볼루션 특성을 이용하여 깊이에 대응하는 공간주 기를 도출하였다. 네 번째로 1 m에서 4 m까지 1 m마다 타켓을 설치한후 회절격자, 카메라, 레이저로 구성된 회절 격자 영상시스템을 이용하여 회절영상을 획득하는 광학실험을 수행하였다. 다섯 번째로 첫 번째 과정에서 세 번째 과정까지 수행한 이론적 분석을 네 번째 과정에서 획득된 회절영상에 적용하여 깊이측정을 수행하였다. 마지막으로 결과 분석을 통해 시스템의 깊이해상도를 도출하였다. 결과 : 깊이 측정 실험을 수행하였고 제안된 방법의 타당성을 검증하였다. 회절영상배열의 공간주기는 타겟물체 와 회절격자사이의 거리가 멀어질수록 증가한다, 그러나 그 증가하는 비율은 물체거리에 반비례하였다. 결론 : 회절격자의 특성을 응용한 깊이 측정 시스템을 제안하였으며 이론분석과 광학실험을 통해 타당성을 검증 하였다.

This study investigates the opening force required for shucking farmed oysters to support the development of automated oyster-shucking systems. Oysters sourced from Yeosu and Tongyeong were tested for shell length, width, height, total weight, meat weight, and opening force. Results showed an average opening force of 8.1 kgf for one-year-old Yeosu oysters, 7.4 kgf for one-year-old Tongyeong oysters, and 8.7 kgf for two-year-old Tongyeong oysters, with correlations to shell width, height, and meat weight depending on production sea area and growing age. These findings highlight production sea area and growing age-based differences in oyster characteristics, contributing foundational data to advancing automation in oyster shucking.

The results of the measurements using an optical surface roughness meter are shown according to the angle changes of 0, 0.5, 1, 1.5, 2, and 3°. Through the experiment, it can be seen that the measurement value is 3.140 at 0°, 3.148 at 0.5°, 3.140 at 1°, 3.151 at 1.5°, 5.078 at 2°, and 4.790 at 3° setting. In addition, the test statistic (P) value is 0.000, which is smaller than the significance level of 0.005, so it was confirmed through the experiment that a measurement error occurs according to the angle change when measuring the surface roughness.

Gait analysis can objectively assess abnormal walking, and some walking parameters can help recognize the disease. Existing commercial systems are either too expensive and require attachments to the body or have limitations in detecting abnormal gait. A vision system has been proposed to address this. However it had limitations where the accuracy was inferior in some parameters such as gait phase, step length and width, etc. Therefore we developed a Tactile sensor-based treadmill to detect gait phase, step length, and width. A pilot test was performed and analyzed through an infrared marker-based motion capture system to compare the accuracy of the proposed system. The measured spatiotemporal gait parameters were analyzed through mean and standard deviation and compared to the baseline system. As a result of the experiments, it was confirmed that higher step width performance was achieved compared to previous studies. Future studies will validate the system with many participants and conduct clinical studies on gait recognition through abnormal gait analysis.