• 한국빅데이터학회지
• /
• 제7권1호
• /
• pp.37-47
• /
• 2022

자율배송 운행 데이터는 코로나 시대의 라스트마일 배송에 대한 패러다임 변화를 주도하는 핵심이다. 국내 자율배송로봇과 해외 기술선도국가 간의 기술격차 해소를 위해서는 인공지능 학습에 사용 가능한 대규모 데이터 수집과 검증이 최우선으로 요구된다. 따라서 해외 기술선도국가에서는 인공지능 학습데이터를 누구든 사용가능한 공공데이터 형태로 오픈하여 검증과 기술발전에 기여하고 있다. 본 논문은 자율배송로봇 학습을 목적으로 326개의 객체를 수집하고 Mask r-cnn, Yolo v3 등의 인공지능 모델을 학습하고 검증하였다. 추가적으로 두 모델을 기반으로 비교하고 향후 자율배송로봇 연구에 요구되는 요소를 고찰하였다.

• 한국빅데이터학회지
• /
• 제9권1호
• /
• pp.115-126
• /
• 2024

전세계적으로 재난은 발생 규모와 피해액이 증가하고 있으며, 재난 대응을 위한 물류 활동의 중요성이 높아지고 있다. 재난 대응을 위한 물류 네트워크는 재난으로부터 상대적으로 안전한 지역에 물류 거점을 설치하고 재난 발생 지역으로 구호물자 및 긴급 의약품을 안정적으로 공급할 필요가 있다. 이에 따라 본 연구에서는 재난 대응을 위한 구호물자 배송 네트워크 설계를 위해 재난 취약성을 최소화시키는 드론 배송 거점 입지 선정에 대해 연구를 진행하였다. 드론을 통한 구호품 수송을 위해 드론의 최대 배송 가능 거리를 고려하고, 자연재해 취약도 지수를 활용하여 재난 취약도를 최소화 시키는 드론 배송 거점 입지를 선정하는 최적화 모델을 도출하였다. 분석 결과 재난 취약도를 최소화하기 위한 배송 거점 투자는 재난대응을 위한 거점이 증가하지만, 이를 통해 재난 취약도를 완화하여 상대적으로 안전하고 효과적으로 드론 배송을 활용한 재난 대응 물류 체계 운영이 가능할 것으로 분석되었다.

• 한국시뮬레이션학회논문지
• /
• 제22권3호
• /
• pp.43-53
• /
• 2013

본 연구는 소상공 서비스 회사의 이익을 극대화하고, 배달음식을 고려함에 있어서 소비자의 편의성을 증대시키며, 노인의 사회참여를 활성화시키기 위한 방안으로 배달을 외주화하는 방안을 수립하기 위한 연구이다. 이를 위해 일반적으로 집에서 자주 주문하는 음식인 중국음식점을 대상으로 물류 시스템을 개선하여 업체와 소비자, 외주 배달 업체 모두 Win-Win-Win 할 수 있는 전략을 수립하고자 시뮬레이션 분석을 수행하였다. 시뮬레이션에 사용된 입력데이터는 실제 중국음식점에서 발생하는 데이터와 인터뷰 결과를 통하여 얻은 데이터를 정리하여 사용하였다. 외주 배달 업체의 배달인원과 이용요금에 따라 총 6가지의 시나리오를 설정하였으며, 각 시나리오별로 3개 음식점의 상황을 달리하여 시뮬레이션 실험을 실행하여 결과를 분석하였다. 분석결과 외주 배달을 이용할 경우 소상공 서비스 회사는 매출과 이익의 증대를 이룩할 수 있으며, 소비자는 자신이 원하는 음식을 보다 빨리 배달받을 수 있게 된다. 또한 외주 배달 운영 업체는 노인을 고용하여 수익을 낼 수 있으며, 이를 통해 노인문제를 해결하기 위한 하나의 방안으로 활용될 수 있을 것으로 판단된다.

• 분석과학
• /
• 제33권3호
• /
• pp.159-166
• /
• 2020

진공금속증착법(vacuum metal deposition, 이하 VMD)는 비다공성과 반다공성 표면의 잠재지문을 현출하는데 효과적이다. VMD는 일반적인 기법으로 현출할 수 없거나 어려운 표면에 유류된 지문을 현출하는 경우에서 활용할 수 있다. VMD 기법이 권장되는 표면은 비닐, 폴리머 지폐, 마그네틱 코팅 처리가 된 티켓 등이 있다. 본 연구에서는 택배 봉투로 주로 사용되는 분홍색 고밀도 폴리에틸렌 봉투(HDPE)와 저밀도 폴리에틸렌 봉투(LDPE)에 지문을 유류한 뒤 최소 12시간부터 최대 28일이 경과한 지문을 현출하기 위한 금의 최소 투입량을 탐색하였다. 그리고 그 결과를 흑색분말, 형광분말의 효과와 비교하였다. 또한, 실제로 배송에 사용된 택배 봉투를 수거한 다음 HDPE와 LDPE로 분류하고 pseudo-operation test를 시행하였다. 그 결과, VMD는 HDPE와 LDPE 표면에서 비교적 일관된 지문 현출 결과를 보여주었다.

• 한국의학물리학회지:의학물리
• /
• 제27권3호
• /
• pp.169-174
• /
• 2016

The aim of this study is to investigate the delivery accuracy of intensity-modulated radiation therapy (IMRT) plans in the two-headed mode of the ViewRay$^{TM}$ system in comparison with that of the normal operation treatment plan of the machine. For this study, a total of eight IMRT plans and corresponding verification plans were generated (four head and neck, two liver, and two prostate IMRT plans). The delivered dose distributions were measured using ArcCHECK$^{TM}$ with the insertion of an ionization chamber. We measured the delivered dose distributions in three-headed mode (normal operation of the machine), two-headed mode with head 1 disabled, two-headed mode with head 2 disabled, and two-headed mode with head 3 disabled. Therefore, a total of four measurements were performed for each IMRT plan. The global gamma passing rates (3%/3 mm) in three-headed mode, head 1 disabled, head 2 disabled, and head 3 disabled were $99.9{\pm}0.1%$, $99.8{\pm}0.3%$, $99.6{\pm}0.7%$, and $99.7{\pm}0.4%$, respectively. The difference in the gamma passing rates of the three- and two-headed modes was insignificant. With 2%/2 mm, the rates were $96.6{\pm}3.6%$, $97.2{\pm}3.5%$, $95.7{\pm}6.2%$, and $95.5{\pm}4.3%$, respectively. Between three-headed mode and head 3 disabled, a statistically significant difference was observed with a p-value of 0.02; however, the difference was minimal (1.1%). The chamber readings showed differences of approximately 1% between three- and two-headed modes, which were minimal. Therefore, the treatment plan delivery in the two-headed mode of the ViewRay$^{TM}$ system seems accurate and robust.

• 시스템엔지니어링학술지
• /
• 제19권2호
• /
• pp.59-73
• /
• 2023

Due to the steady growth of the online shopping market and contact-free consumption, the volume of parcels in South Korea continues to increase. However, there is a lack of manpower for delivery workers to handle the growing parcel volume, leading to frequent accidents related to delivery work. As a result, the government and local authorities strive to enhance last-mile logistics efficiency. As one of these measures, unmanned parcel storage lockers are installed and utilized to handle last-mile deliveries. However, the existing parcel storage involves the inconvenience of couriers having to put each parcel in each locker, and this is somewhat insufficient to relieve the workload of delivery workers. In this study, we propose parcel storage devices that use active loading technology to minimize the workload of delivery workers, extract operation risk factors to apply this system to actual sites, and establish risk reduction methods based on the ALARP concept. Through this study, we have laid the groundwork for improving the safety of the system by identifying and proposing mitigation measures for the risk factors associated with the proposed parcel storage devices utilizing active loading technology. When applied in practical settings in the future, this foundation will contribute to the development of a more efficient and secure system. By applying the ALARP concept, a systems engineering technique used in this research, to the development and maintenance of storage devices leveraging active loading technology, it is thought to make the development process more systematic and structured. Furthermore, through the risk management of the proposed system, it is anticipated that a systematic approach to quality management can be employed to minimize defects and provide a stable system. This is expected to be more useful than the existing unmanned parcel storage devices.

• 지역사회간호학회지
• /
• 제6권2호
• /
• pp.259-274
• /
• 1995

The study is to grasp the problems related to operation of Maternity clinic of public health centers in seoul and needs for public health of community in relation to consumers and providers in order to improve efficiency of community public health for mothers and children. Four pregnancy woman, who receive medical care at the maternity clinic of M public health centers in seoul and understand the purpose of this study, and one nurse who works at the were the objects of this field study. Participating observation and intensive interviews were conducted to collect data. All of them were performed as necessary from time to time since December, 1994, and not during a specific period. Through an data analysis in the order of sector analysis and classification analysis, the data were classified into specific patterns and the results are the following; 1. All of the subjects were using both private hospitals and public clinics, but managing activities prior to delivery were not carried out in accordence with theories for those activities. 2. The subjects showed two types of response to utilizing maternity clinic. they answered that the advantages of the clinic were 'short waiting time for medical treatment', 'medical treatment by female doctors' and 'economical benefit.' Meanwhile, they gave negative response to the problems of 'non-implementation of delivery' 'uncleanness and insufficient facilities', 'limited time of treatment', 'lack of expertise' and 'want of public health education for materity.' 3. Problems related to operation of maternity clinic were 'lack of experts', 'irrational facility structure' and 'absolutely lack budget'. In terms of the status of managing the subjects, 'programs only aimed at attaining the central-government-assigned objects' and 'limited management before and after delivery by non-implementing delivery' were pointed out to be problems. Regarding public health education before delivery and PR relations, 'superficial public health education for maternity' and 'absence of PR programs' were named. In planning and evaluation, 'absence of autonomous planning and evaluation by the clinic itself' was a major problem in operating the clinic. 4. 'Substantial health education and PR', 'supplementation of facilities and eqipment', 'development' and supply of demanded service by the subjects', 'implementation of autonomous programs', and 'reinforcement of supplementary education' were presented as alternatives for efficient opration of maternity clinics.

• 한국의류산업학회지
• /
• 제10권6호
• /
• pp.873-881
• /
• 2008

The purpose of this study is to examine the effects of sales person's perception of ethical management on job performance in department stores. Sales person's perception of ethical management consists of such things as fairness, looking for short-term profits and observing the rules. Job performance consists of such things as sales person's organizational commitment, Sales person's service delivery level, rational operations, and participational attitude. For these purposes, the author developed several hypotheses. The data was collected from 435 sales person's in department stores. The results of this study are as follows: First, fairness, looking for short-term profits, and observing the rules had a significantly positive effect on sales person's organizational commitment. Second, fairness and observing the rules had significantly positive effect on sales person's service delivery level. Third, fairness had a significantly positive effect on rational operation. Fifth, looking for short-term profits and observing the rules had significantly positive effect on participational attitude. At the end of this paper, limitations, further research directions, and implications are suggested.

• The Journal of Korean Physical Therapy
• /
• 제4권1호
• /
• pp.19-25
• /
• 1992

The purposes of this study is to survey the clinical findings of congenital muscular torticollis. The subjects were 44 congenital muscular torticollis patients who were treated at physical therapy department of rehabilitation medicine, presbyterian medical center during the period Jan. Dec. 1991 The results were as follows : 1. Patients were evenly divided by gender(22 bodys, 22 girls). Left-sided involvement was found in 27 cases$(61.4\%)$, and right side in 17 cases$(38.6\%)$. 2. Abnormal delivery was 29 cases$(65.9\%)$. Those included resarean section, breech presentation with vaginal delivery and difficulty delivery. 3. Most of torticollis were primipara infant 33 cases$(75\%)$ 4. Associated congenital anomalies were noted in 12 cases, the most common cases were central co-ordination disturbance. 5. Patients was most commonly referred form the department of pediatrics. 6. Sternocleidomastoid fibrotic nodules were noted in 32 cases$(72.7\%)$. 7. Four cases had excision of the sternocleidomastoid fibrotic nodules in infancy and average at which operation was twelve months of life(range from nine months to fourteen months). 8. Facial asymmetry was noted in 13 cases at the begining of treatment, and the asymmetry was corrected after treatment in 10 cases. 9. The average duration of treatment was 3 months when the treatment was started in 3 weeks old. 10. The result was good in 22 cases$(50\%)$, fair in 12 Cases$(27.3\%)$.

• 대한안전경영과학회지
• /
• 제17권4호
• /
• pp.247-258
• /
• 2015

The purpose of this study is to let the entire logistics system be managed in cyberspace by effectively sharing the logistics information between companies involved in the process, changing conventional commerce to electronic commerce. Most of the goods traded through electronic commerce are small goods involving small business transactions. This produces many problems in shipping and delivery and the leads an inefficient logistics system. Another problems is that there is no sharing of information that process the logistics flow and no systematic management of pick-up and delivery information. As a result, rise in logistics cost, longer delivery period and poor service quality are inevitable and these results are becoming an obstacle in the widespread usage of the electronic commerce. Companies that are part of logistics center can cooperate logistics business in Cyber space and share the entire logistics information through the cyber logistics center. This turns out in effective sharing of logistics information, and thus, allows efficient management of logistics, improves logistics service, and reduces logistics cost.