Online consumer activities have increased considerably since the COVID-19 outbreak. For the products and services which have an impact on everyday life, online reviews and recommendations can play a significant role in consumer decision-making processes. Thus, to better serve their customers, online firms are required to build online-centric marketing strategies. Especially, it is essential to define core value of customers based on the online customer reviews and to propose these values to their customers. This study discovers specific perceived values of customers in regard to a certain product and service, using online customer reviews and proposes a customer value proposition methodology which enables online firms to develop more effective marketing strategies. In order to discover customers value, the methodology employs a text-mining technology, which combines a sentiment analysis and topic modeling. By the methodology, customer emotions and value factors can be more clearly defined. It is expected that online firms can better identify value elements of their respective customers, provide appropriate value propositions, and thus gain sustainable competitive advantage.

In this study, the vertical distribution of giant jellyfish analyzed echo counting method and such survey methods as sighting and trawl were used to compare its density estimates. In May and July 2021, surveys were conducted in the East China Sea and the coastal waters of Korea. As a result, Nemopilema nomurai were evenly distributed in all water layers in East China Sea in May and July. When considered the correlation by each survey methods, it is possible to identify jellyfish in the surface area by sighting method and using sampling net; however, it has a low correlation with acoustic estimates due to marine environmental factor such as weather condition, wind and atmospheric pressure. Therefore, the result can be utilized by basic data when estimating jellyfish’s distribution patterns and density estimates from each survey methods hereafter.

The fishery compensation by marine spatial planning such as routeing of ships and offshore wind farms is required objective data on whether fishing vessels are engaged in a target area. There has still been no research that calculated the number of fishing operation days scientifically. This study proposes a novel method for calculating the number of fishing operation days using the fishing trajectory data when investigating fishery compensation in marine spatial planning areas. It was calculated by multiplying the average reporting interval of trajectory data, the number of collected data, the status weighting factor, and the weighting factor for fishery compensation according to the location of each fishing vessel. In particular, the number of fishing operation days for the compensation of driftnet fishery was considered the daily average number of large vessels from the port and the fishery loss hours for avoiding collisions with them. The target area for applying the proposed method is the routeing area of ships of Jeju outer port. The yearly average fishing operation days were calculated from three years of data from 2017 to 2019. As a result of the study, the yearly average fishing operation days for the compensation of each fishing village fraternity varied from 0.0 to 39.0 days. The proposed method can be used for fishery compensation as an objective indicator in various marine spatial planning areas.

식물성 떡갈비를 조리방법을 달리하여 조리한 후 수분함량, pH, 가열감량, 직경 감소율, 두께 감소율, 색도, 물성, 관능검사를 측정하였다. 수분함량은 전자레인지로 조리한 식물성 떡갈비가 가장 높은 값을 나타냈으며, 오븐으로 조리했을 때 가장 낮은 값을 나타냈다. pH는 전자레인지로 조리한 경우 가장 높은 값을, 팬 프라잉한 떡갈비에서 가장 낮은 값을 나타냈다. 가열감량과 직경 감소율, 두께 감소율은 모두 오븐에서 조리한 떡갈비에서 가장 높게 나타났다. 가열감량은 전자레인지 조리시 가장 낮게 나타났으 며, 직경 감소율과 두께 감소율은 에어프라이어에서 조리한 떡갈비에서 가장 낮게 나타났다. 식물성 떡갈비의 명도와 적색도는 각각 전자레인지, 오븐으로 조리한 경우 가장 높게 나타났고, 명도와 적색도 모두 팬 프라잉이 가장 낮은 값을 나타냈다. 황색도는 팬 프라잉한 떡갈비에서 가장 높은 값을 나타냈으나 오븐과 유의적 차이는 없었으며 전자레인지로 조리한 경우 가장 낮은 값을 나타냈다. 물성은 경도, 씹힘성, 탄력성, 응집성 모두 팬 프라잉한 식물성 떡갈비에서 가장 높은 값을 나타냈으며, 전자레인지로 조리한 경우 가장 낮은 값을 나타냈다. 식물성 떡갈비의 기호도 평가는 전반적으로 팬 프라잉한 경우 높은 값을 나타냈으며. 조직감 항목을 제외하고 전자레인지로 조리한 식물성 떡갈비의 기호도가 낮게 나타났다. 이와 같은 결과로 보아 팬 프라잉이 식물성 떡갈비의 기호도를 향상시킬 수 있는 적절한 조리방법으로 판단된다.

AI가 시장의 패러다임을 바꾸는 새로운 혁신 기술로 주목받고 있다. 기업은 AI 의 기술적 이점이 잘 반영되면서 동시에 시장의 수요를 충족하는 방법을 적용하여 신제품을 개발해야 한다. 하지만 업계에는 이러한 요건을 충족하는 방법론이 부재하다 보니 기업들은 기존 제품개발 방법론을 이용해 AI 기반 제품개발을 추진하고 있다. 이로 인해 AI의 기술적 이점이 충분히 반영되지 못하거나 AI의 기술적 잠재성이 시장 가치로 연결되지 못하게 된다. 이러한 한계를 극복하기 위해 이 연구는 AI 기반의 신제품을 개발하기 위한 새로운 방법론을 제시한다. AI 혁신이 기존 방식과 다른 차별적 속성을 확인하고, 이러한 속성이 반영된 제품 설계 프로세스와 방법론을 제시한다. 이 연구는 AI 제품개발이 양손잡이 접근(Ambidexterity approach)을 지향해야 함을 강조하며, 테크놀로지 푸시(Technology push) 기반의 아이디어 생성, 마켓 풀(Market pull) 기반의 소비자 요구조건 분석, 제품 설계 구체화 등을 포함하는 AI 기반 제품의 설계(Design) 프로세스 및 구체적인 개발 방법을 제안했다. 이 방법론의 현 실 적용 가능성을 검증하기 위해 사례연구를 실시, AI 기반의 차량용 인포테인먼트 시스템 개발 전략을 도출한다. 기술적 가능성에 기반하여 13개의 혁신 아이디어를 생성했고, 카노 (KANO) 분석과 TOPSIS의 결합에 의한 소비자 요구조건 분석을 통해 총 6개의 신제품 개 발 전략을 도출했다. 이 연구제서 제안하는 방법론은 기업이 AI 기반의 혁신제품을 통해 신 시장을 개척하거나 기존 제품의 고도화를 통해 시장 확장을 펼치는 데 유용하게 활용될 수 있다.

ROPS is a structure installed to protect drivers from tractor rollover accidents and is being tested for certification under the OECD code. Because this test requires a lot of cost and time to develop the ROPS and to produce test model, the OECD is discussing the introduction of virtual test using finite element analysis. In this study, the results were compared by conducting a strength test and finite element analysis applied with the OECD code to use it as a basic data for standardization of ROPS virtual test methods. It was confirmed that the results of the analysis of the bolts and plates of the coupling part and the folding part were more close to the physical test results than the rigid elements and constraints at the point of coupling the tractor and ROPS.

This paper proposes a mathematical model that can calculate the luminescence characteristics driven by alternating current (AC) power using the current-voltage-luminance (I-V-L) properties of organic light emitting devices (OLED) driven by direct current power. Fluorescent OLEDs are manufactured to verify the model, and I-V-L characteristics driven by DC and AC are measured. The current efficiency of DC driven OLED can be divided into three sections. Region 1 is a section where the recombination efficiency increases as the carrier reaches the emission layer in proportion to the increase of the DC voltage. Region 2 is a section in which the maximum luminous efficiency is stably maintained. Region 3 is a section where the luminous efficiency decreases due to excess carriers. Therefore, the fitting equation is derived by dividing the current density and luminance of the DC driven OLED into three regions, and the current density and luminance of the AC driven OLED are calculated from the fitting equation. As a result, the measured and calculated values of the AC driving I-V-L characteristics show deviations of 4.7% for current density, 2.9% for luminance, and 1.9% for luminous efficiency.

To improve the shortcomings and expand the advantages of the single-roll melt drag method, which is a type of continuous strip casting method, the melt drag method with a molding belt is applied to AZ31 magnesium alloy. By attaching the forming belt to the melt drag method, the cooling condition of the thin plate is improved, making it possible to manufacture thin plates even at high roll speed of 100 m/min or more. In addition, it is very effective for continuous production of thin plates to suppress oxidation of the molten metal on the roll contact surface by selecting the protective gas. As a result of investigating the relationship between the contact time between the molten metal and the roll and the thickness of the sheet, it is possible to estimate the thickness of the sheet from the experimental conditions. The relationship between the thin plate thickness and the grain size is one in which the thinner the thin plate is, the faster the cooling rate of the thin plate is, resulting in finer grain size. The contact state between the molten metal and the roll greatly affects the grain size, and the minimum average grain size is 72 μm. The thin plate produced using this experimental equipment can be rolled, and the rolled sample has no large cracks. The tensile test results show a tensile strength of 303 MPa.

참외는 줄기를 땅 위에서 포복재배로 유인하는 것이 일반적으로써 노동강도가 강해서 농업인 근골격계 질환의 원인이 되므로 작업강도를 낮추고 품질도 향상시키기 위한 새로운 재배 방법을 찾고자 본 실험을 수행하였다. 그 결과, 줄기를 상향으로 유인하는 처리구가 생육 및 광합성 특성이 좋았고, 근활력은 하향 줄기 유인 처리구에서 좋은 것으로 나타났다. 상품 수량에 있어서는 상향 처리구가 4.055kg/10a, 하향 처리구가 3,983kg/10a으로 통계적인 유의성은 없었다. 줄기유인 작업에 대한 작업자세 평가의 경우, 기존 포복재배가 상향, 하향 재배방식 보다 위험수준이 높은 것으로 평가되었다. 결론적으로, 참외 수경 수직재배는 작물 생육, 수확량 및 작업 노동강도 등을 고려해 볼 때 기존 포복재배 방식을 대체할 수 있는 새로운 재배방법이라고 판단되고, 참외 줄기 유인 방법별로 수량 등에 유의성이 없으므로 상향 줄기유인 방법이나 하향 줄기 유인방법 중에서 하우스의 구조나 재배자의 의향에 따라서 선택하여 수직재배를 하면 될 것으로 사료된다.

In this study, algorithms for analyzing the torsion of buildings under earthquake excitation are developed. The algorithm and formulations to account for the torsional angle are verified by analyzing the seismic acceleration time history data. The method was applied to the reference buildings to examine their operation and usability. The reference application demonstrated that the noise-canceling scheme successfully overcame various obstacles in the field measurements. The developed method is expected to be used as a tool to support a loss assessment system for determining the direction and priority of disaster response in the event of an earthquake.