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박수범,최항묵,최흥국 인제대학교 1999 仁濟論叢 Vol.14 No.3
인터넷과 통신매체의 확산과 더불어 최근에는 기업간, 기업과 정부간에 주로 정형적인 문서교환에 활용되던 초기의 EDI(Electronic Data Interchange)가 멀티미디어 정보교환이 가능한 인터넷의 보급 확산과 함께 소비자를 대상으로 하는 전자상거래(EC : Electronic Commerce)로 급속히 확산되고 있으며, 이를 지원하기 위해 기업의 정보화 기반을 구현하는 ERP(Enterprise Resource Planning)도 요구되고 있다. 이미 전세계적으로 수만개의 쇼핑몰이 들어서 있으며, 새로운 전자상거래 적용 사이트가 계속해서 생기고 있으며, 이들 사이트마다 제각각 자신들의 아이템을 화려한 멀티미디어적인 요소로 선전하며 소비자를 기다린다. 그러나, 전자상거래는 네트워크를 통하여 형성되므로 사용자들은 서로 만나지 않고 거래하게 된다. 이는 전자상거래의 장점이기도 하지만, 반대로 상호간의 신분에 대한 인증이 쉽지 않다는 단점이 된다. 본 논문에서는 이러한 위험을 방지하기 위한 암호화 인증 기술들에 대한 최근까지의 표준들을 기반으로 논의하고자 한다. Recently, early EDI(Electronic Bata Exchange), which used to exchange formal documents among enterprises including government, is getting changed into EC(Electronic Commerce) because of rapid propagation of the Internet that can make it possible to exchange multimedia information for consumers. In addition to, ERP(Enterprise Resource Planning) is getting improved to support what I mentioned above. Already there are millions of shopping malls through the world and newly web sites for EC are getting emerged advertising their own items using multimedia technology and Unfortunately, As everbody knows, EC is made through Network so users do not have to meet one another to deal. This fact can be an advantage. However it can be a disadvantage because it is not easy to make sure the authentication of private ID's for each other. This paper would like go through "Encryption Authentication Technology" to discuss these disadvantages.
Choi, Han Ryul,Tilahun, Shimeles,Park, Do Su,Lee, Yeon Mi,Choi, Jong Hang,Baek, Min Woo,Jeong, Cheon Soon International Society for Horticultural Science 2019 Scientia horticulturae Vol. No.
<P><B>Abstract</B></P> <P>In this study, the possibility of prolonging the freshness of kiwifruit cultivars for the purpose of even distribution in time and place has been investigated. Green ‘Hayward’, gold ‘Haegeum’ and red ‘Hongyang’ kiwifruit cultivars were harvested at 160, 170 and 180 days after full bloom (DAFB) and stored at 0 °C until 4 months. Firmness and firmness related parameters, biochemical parameters, physiological parameters, decay percentage and overall sensory evaluation were observed during the study. On the basis of harvesting time, the order of storability of all the three cultivars could be 160 DAFB > 170 DAFB >180 DAFB, respectively. The study revealed that kiwifruit harvested at 160 DAFB were stored up to 4 months without affecting major quality indices during storage. However, overall sensory quality evaluation showed that kiwifruits harvested at 160 DAFB attained good eating quality after 3 months of storage in green and red kiwi cultivars, and after one month storage in gold kiwi cultivar. Hence, in order to ensure good sensory quality and to fulfill consumer's preference during distribution, further ripening studies like exogenous ethylene treatment are necessary immediately after harvest or at any time during the storage period</P> <P><B>Highlights</B></P> <P> <UL> <LI> Harvest time affects both quality and storability of kiwifruit cultivars. </LI> <LI> Harvesting at 160 DAFB reduced decay percentage during long-term cool storage. </LI> <LI> Ripening treatments at harvest or during storage period could ensure good sensory quality. </LI> </UL> </P>
Application of unified equivalent frame method to two-way slab structures with beams
Choi, Seung-Ho,Lee, Deuck Hang,Oh, Jae-Yuel,Cho, Hae-Chang,Lee, Jae-Yeon,Kim, Kang Su TECHNO-PRESS 2018 COMPUTERS AND CONCRETE Vol.22 No.4
The current design codes present an equivalent frame method (EFM) for the analysis and design of two-way slab structures. However, since the EFM was developed to be suitable for two-way slab structures subjected to gravity loads only, it brings many problems in its application to the analysis of two-way slabs to which gravity and lateral loads are applied simultaneously. Therefore, authors proposed the unified equivalent frame method (UEFM) that can analyze the structural behavior of flat-plate slab systems subjected to gravity and lateral loads in their previous studies. In this study, the UEFM was modified to be applicable to the two-way slab system with beams. In addition, the accuracy of the proposed UEFM was then examined by comparing it to the lateral behaviors of the two-way slab specimens.
황진수,최규호,장동헌 한국협동조합학회 2002 韓國協同組合硏究 Vol.20 No.2
The purpose of this study is to evaluate the performance of agricultural cooperatives by using Data Envelopment Analysis(DEA). The DEA method is a relative evaluation method on the basis of linear programming. Also, it is known as a useful method for the evaluation of nonprofit organization which cannot be measured. Traditional methods cannot be considered for evaluating multiple inputs and outputs in a model simultaneously. However, the DEA can consider them simultaneous in a model. There, the DEA method provide quantitative data as a performance measurement. In this paper, the 80 units has been taken for the purpose of analysis. All of the units are homogeneous groups. In this study, each unit is considered as a decision making unit(DMU) and the findings as DEA results.
Choi, Seung-Ho,Lee, Deuck Hang,Oh, Jae-Yuel,Kim, Kang Su,Lee, Jae-Yeon,Shin, Myoungsu 테크노프레스 2014 Earthquakes and structures Vol.7 No.5
In the previous paper, authors proposed the unified equivalent frame method (UEFM) for the lateral behavior analysis of the flat plate structure subjected to the combined gravity and lateral loads, in which the rotations of torsional members were distributed to the equivalent column and the equivalent slab according to the relative ratio of gravity and lateral loads. In this paper, the lateral behavior of the multi-span flat plate structures under various levels of combined gravity and lateral loads were analyzed by the proposed UEFM, which were compared with test results as well as those estimated by existing models. In addition, to consider the stiffness degradation of the flat plate system after cracking, the stiffness reduction factors for torsional members were derived from the test results of the interior and exterior slab-column connection specimens, based on which the simplified nonlinear push-over analysis method for flat plate structures was proposed. The simplified nonlinear analysis method provided good agreements with test results and is considered to be very useful for the practical design of the flat plate structures under the combined gravity and lateral loads.
Switched-Capacitor Based Digital Temperature Sensor Implemented in 0.35-μm CMOS Process
( Su-bin Kim ),( Jeon-woong Choi ),( Tae-gyu Lee ),( Ki-ppeum Lee ),( Hang-geun Jeong ) 한국센서학회 2018 센서학회지 Vol.27 No.1
A temperature sensor with a binary output was implemented using switched-capacitor circuits in a 0.35-μm CMOS(com-plementary metal-oxide semiconductor) process. The measured temperature exhibited good agreement with the oven temperature after calibration. The measured power consumption was 5.61 mW, slightly lower than the simulated power consumption of 6.63 mW.
Choi, Kyungwho,Kim, Suk Lae,Yi, Su-in,Hsu, Jui-Hung,Yu, Choongho American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.28
<P>Thermoelectric (TE) energy conversion with nontraditional organic materials is promising in wearable electronics and roll-to-roll manufacturing because of mechanical flexibility, lightweight, and easy processing. Although typical organic materials have a benefit of low thermal conductivity that creates a large temperature gradient, relatively small thermopower (or Seebeck coefficient) often requires copious number of TE legs to fabricate practical TE devices. Here, we show that hybrids of poly(3,4-ethylenedioxythiophene)-tosylate (PEDOT-Tos) and carbon nanotubes (CNTs) can produce extremely large thermopower, ∼14 mV/K at room temperature by a chemical reduction. With decent electrical conductivity, an extraordinary power factor of ∼1200 μW/m K<SUP>2</SUP> at room temperature was observed. The large power factor could be attributed to prominent dual electronic and ionic conduction, which is likely to be promoted by embedding the CNTs in PEDOT due to the improvement in the carrier mobility, in comparison with the inferior and widely varying TE properties of PEDOT-only samples in the literature. While a higher CNT concentration gave a larger electronic contribution, a longer reduction or a lower CNT concentration provided a larger ionic contribution. Meanwhile, well-separated CNTs created CNT junctions intervened by PEDOT-Tos, suppressing the thermal transport. Further research utilizing the high TE responses could greatly help to develop practical wearable and/or mass-producible thermal energy harvesting and storage devices.</P> [FIG OMISSION]</BR>