• Journal of Korean Society of Environmental Engineers
• /
• v.27 no.10
• /
• pp.1035-1042
• /
• 2005

Granular Activated Carbon(GAC) is widely used in drinking water treatment. At S and B Water Treatment Plant, GAC is used in place of granular media in conventional rapid filters(GAC Filter-Adsorber) for removal of Disinfection By-products(DBPs). The primary focus of this study is on the performance of existing filter-adsorber, and their operation. It was found that F/A process removed turbidity as effective as sand system. The ratio of Hydrophobic DOM (HPO) and hydrophilic DOM (HPI) fraction in the raw water at S and B WTP was similar. Filter Adsorber presented earlier DOC breakthrough and steady state condition which was contributed by biodegradation during operation period. The removal efficiency of DBPs were used to evaluate the filter performance. The DBPs concentration of F/A treated water was below treatment goal level (THM < $80\;{\mu}g/L$, HAA < $60{\mu}g/L$). The removal efficiency of THM decreased rapidly during operation period. However, HAA were removed steadily regardless of the influent concentration of HAA. These results indicate that the removal of THM depend upon the adsorption mechanism while the removal of HAA depend upon biodegradation as well as adsorption. The decrease of adsorption capacity and characteristic value of GAC may be attributed to the effect of high organic loading, residual free chlorine, coagulants, manganese oxidants and frequently backwashing. This study has confirmed that Filter adsorber process can be considered as effective alternatives for the removal of DBPs, especially HAA.

• Journal of forensic and investigative science
• /
• v.1 no.1
• /
• pp.31-44
• /
• 2006

The importance regarding the notion of immediate medical treatment and nursing for the victims of sexual crimes is not widely recognized yet in Korea. Throughout this research is focused on the nursing systems and the system of foreign countries in reference to sexual crime victims, and the conclusion is as follows. In Korea, there are currently no educational or medical institutes for the medical handling for the victims of sexual crimes, and the role of nurses in the medical institutes is insufficient. In addition, the basis for the standard of operation regarding the initial response, evidence collection, pursuit of systematical evidence and data is not established even in the sexual assault counseling/advocacy center. Therefore, it is necessary to foster the sexual assault nurse examiner for the sexual crime victims, and to develop adequate training programs based on the present situation in Korea. Though the cooperation among government, medical institutes, and social movement groups, it is essential to initiate effective and publicly-trusted specialized training programs for forensic nurses who will be fully charged with the treatment of sexual crime victims. By introducing the sexual assault nurse examiner system, it can be possible to develop advanced treatment for the child or adolescent victims of sex crimes.

• Journal of Internet Computing and Services
• /
• v.8 no.3
• /
• pp.19-32
• /
• 2007

This paper present a new face recognition method based on LVQ neural net to construct a real time face recognition system. The previous researches which used PCA, LDA combined neural net usually need much time in training neural net. The supervised LVQ neural net needs much less time in training and can maximize the separability between the classes. In this paper, the proposed method transforms the input face image by PCA and LDA sequentially into low-dimension feature vectors and recognizes the face through LVQ neural net. In order to make the system robust to external light variation, light compensation is performed on the detected face by max-min normalization method as preprocessing. PCA and LDA transformations are applied to the normalized face image to produce low-level feature vectors of the image. In order to determine the initial centers of LVQ and speed up the convergency of the LVQ neural net, the K-Means clustering algorithm is adopted. Subsequently, the class representative vectors can be produced by LVQ2 training using initial center vectors. The face recognition is achieved by using the euclidean distance measure between the center vector of classes and the feature vector of input image. From the experiments, we can prove that the proposed method is more effective in the recognition ratio for the cases of still images from ORL database and sequential images rather than using conventional PCA of a hybrid method with PCA and LDA.

• Journal of Korean Society of Environmental Engineers
• /
• v.36 no.8
• /
• pp.528-533
• /
• 2014

Recently, people interest in environmental pollution and attempt to improve the indoor air quality contaminated with various pollutants since it is very important to construct healthy and comfortable living environment. In the current study, we used the technology that has first received the certification of green technology for improving the removal efficiency of malodor causing substances. This green technology is a new technology to increase the reactivity of the odorous substances with OH radicals for oxidation reaction by using an infrared lamp in the existing air purification system. Comparing the efficiency of the green technology with the infrared lamp to that of the existing technology of air cleaner, there was a difference in the decomposition efficiency depending on the initial concentrations and speciation of the odorous substances. The removal efficiencies of contaminants were enhanced by 16.9 and 13.2% at low and high concentrations, respectively.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.26 no.1
• /
• pp.31-39
• /
• 2016

Hash function is a cryptographic primitive which conduct authentication, signature and data integrity. Recently, Wang et al. found collision of standard hash function such as MD5, SHA-1. For that reason, National Security Research Institute in Korea suggests a secure structure and efficient hash function, LSH. LSH consists of three steps, initialization, compression, finalization and computes hash value using addition in modulo $2^W$, bit-wise substitution, word-wise substitution and bit-wise XOR. These operation is parallelizable because each step is independently conducted at the same time. In this paper, we analyse LSH structure and implement it over SIMD-SSE, AVX and demonstrate the superiority of LSH.

• Journal of Korean Society of Forest Science
• /
• v.103 no.2
• /
• pp.299-306
• /
• 2014

Japan and Korea have developed forest therapy policies, but their policies differ in several respects. First, Forest therapy projects are managed by local governments and residents in Japan, while they are operated by Korea Forest Service. Second, Japan adopts the certification system of forest therapy areas, emphasizes medical and scientific evidences, maintains the quality of forest therapy by inducing competitive participation of local governments and residents, and cultivates forest therapists through Forest Therapy Society. In contrast, Korea has adopted the licence system, improved institutional framework, and cultivated therapists, but it is at early stage. Third, Japanese forest therapy policy aims at regional development of the mountain villages, overlapping with other local policies. However, in Korea, the primary policy goal is to expand forest services and thereby having its own policy framework and being promoted strongly.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.10 no.4
• /
• pp.795-804
• /
• 2009

An HSS(Home Subscriber Server) system requires a main-memory database on main-memory unit for the real-tine management of the subscriber information in the mobile communication service, in that the system controls not only basic data for handling calls of users, but also additional service data related to user authentication and operational data. Nonetheless, HSS-DBS system, requiring the reliability and stability, need more secure data store method and a back-up technique because the system have a long startup time and the big problem on the failures of main-memory. This paper proposes an efficient back-up replication technique, on the basis of enhancing the stability and performance of HSS system. The proposed shadowing back-up technique adopting the delayed recovery process, can help minimize the real-time back-up overloads by location registration, while the proposed backup replication method enables more stable system operations with replicating the data to remote server in real time.

• Journal of Practical Engineering Education
• /
• v.11 no.2
• /
• pp.159-165
• /
• 2019

Engineering design education has been established and implemented as three stages of basic design, element design, and capstone design with the introduction of engineering education accreditation system. In the basic design, the concept and procedure of design is introduced to the beginners of engineering, and the creativity and teamwork is practiced rather than mathematical detailed design for the purpose of being connected to and used effectively in the capstone design. In this study, the opinions of the students performing capstone design after taking basic design were surveyed through questionnaire. Overall, students recognize the importance of basic design education and experienced that it is useful. The results indicate that effective basic engineering design education is being carried out, and are considerably agree to those at the professors in the former survey.

• Journal of Global Scholars of Marketing Science
• /
• v.13
• /
• pp.1-27
• /
• 2004

This study attempts to investigate the difference between the internet shoppingmall types. The main purpose of this study is to verify the relationships among shoppingmall evaluation criteria, shopping satisfaction, revisit frequency, and repurchase intention across the shoppingmall type. The following results were shown by testing eleven hypotheses using LISREL. First, shoppingmall evaluation criteria such as entertainment, product authentification, economical prices and on-time delivery were significantly related to shopping satisfaction in general merchandise shoppingmall. Second, in specialty shoppingmall, evaluation criteria like informativeness, economical prices and on-time delivery significantly affected shopping satisfaction. Third, as contrasted with the expectation, site design and product assortment did not have significant impact on satisfaction in both internet shoppingmall types. Fourth, shopping satisfaction was significantly related to revist frequency and repeat purchase intention. Finally, some theoretical and managerial implications were discussed.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
• /
• v.12 no.6
• /
• pp.123-138
• /
• 2017

This study aims to identify the characteristic variables of businesses that would impact the choice of their type in the 6th industry and analyze how they work. To this end, this study analyzed data of 752 businesses certified as belonging to the 6th industry in 2015 through the classification and regression tree (CART) algorithm in decision tree analysis. The results of analysis showed that the type of agricultural product processing affected shaping the type of the 6th industry at the early stage of growth while the type of agricultural product processing, the type of service, region and sales volumes at the stage of growth and service strategy and the type of agricultural product processing at the stage of maturity. These findings empirically identified key business factors that could support businesses in the 6th industry at each stage of growth and presented a direction forward for support of the 6th industry.