• Title/Summary/Keyword: Water Transportation

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A Review of Withering in the Processing of Black Tea

  • Deb, Saptashish;Jolvis Pou, K.R.
    • Journal of Biosystems Engineering
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    • v.41 no.4
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    • pp.365-372
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    • 2016
  • Purpose: Tea is the most frequently consumed drink worldwide, next to water. About 75% of the total world tea production includes black tea, and withering is one of the major processing steps critical for the quality of black tea. There are two types of tea withering methods: physical and chemical withering. Withering can be achieved by using tat, tunnel, drum, and trough withering systems. Of these, the trough withering system is the most commonly used. This study focuses on the different types of withering, their effect on the various quality attributes of tea, and other aspects of withering methods that affect superior quality tea. Results: During physical withering, tea shoots loose moisture content that drops from approximately 70-80% to 60-70% (wet basis). This leads to increased sap concentration in tea leaf cells, and turgid leaves become flaccid. It also prevents tea shoots from damage during maceration or rolling. During chemical withering, complex chemical compounds break down into simpler ones volatile flavor compounds, amino acids, and simple sugars are formed. Withering increases enzymatic activities as well as the concentration of caffeine. Research indicates that about 15% of chlorophyll degradation occurs during withering. It is also reported that during withering lipids break down into simpler compounds and catechin levels decrease. Improper withering can cause adverse effects on subsequent manufacturing operations, such as maceration, rolling, fermentation, drying, and tea storage. Conclusion: Freshly harvested leaves are conditioned physically and chemically for subsequent processing. There is no specified withering duration, but 14-18 h is generally considered the optimum period. Proper and even withering of tea shoots greatly depends on the standards of plucking, handling, transportation, environmental conditions, time, and temperature. Thus, to ensure consumption of high quality tea, the withering step must be monitored carefully.

A Study on the Development of Electric Actuator Control Device for Driving Time Setting Valve Using VHDL (VHDL을 이용한 구동 시간 설정 밸브 전동 엑추에이터 제어 장치 개발에 관한 연구)

  • Kang, Dae-Guk;Choi, Young-Gyu
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.13 no.5
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    • pp.452-459
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    • 2020
  • The electric actuator receives the user's command input signal (open/closed/stop), checks the status of various sensors (valve position, rotational force, motor status, etc.)in the actuator, and controls the motor forward/reverse to open and close the valve. It is a device that outputs the current state of an actuator (valve) and is used in various fields such as dams, power plants, water and sewage facilities, and oil pipeline facilities. If an electric actuator is installed in a power plant and a problem occurs during operation, it can cause a large economic loss, so system reliability is vert important. In this study, in order to increase the safety of the electric actuator, the development of an electric actuator control device capable of setting the ON/OFF time in hardware was conducted to solve the reliability problem that may occur in software. In addition, the electric actuator control device development environment was developed using Xilinx's Spartan7 FPGA and Altium tool.

Seasonal changes in coastal dunes and its implication, Sohwang-ri, in Chungnam Province (보령 소황리 전사구의 계절별 지형변화 특성과 그 의의)

  • JUNG, Pil Mo;CHOI, Kwang Hee;KIM, Yoonmi
    • Journal of The Geomorphological Association of Korea
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    • v.19 no.4
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    • pp.109-122
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    • 2012
  • Topographic changes in the foredune in Sohwang-ri, Boryeong, Chungnam Province was analyzed over the last two years. Seven cross-sections and one permanent plot ($20m{\times}50m$) were periodically studied based on erosion and deposition measurement, in addition to vegetation monitoring and measurement of wind using an automatic weather station. The sand dunes usually grew from late winter to spring and the growth occurred in a period of strong northwesterly winds. From March to April, heavy sedimentation was observed on the front section of the foredune and sand piled up to ca. 30cm to the ca. 25m landward from the high tide line. It is likely that increased wind force and growth of vegetation played a major role in transportation and sedimentation of sand. Meanwhile, the lower part of the sand dunes was eroded when typhoon and spring tide caused a rise in sea level. The transition zone of beach and dune was usually affected by sea water but some frontal slopes were entirely influenced, resulting in dune scarps. The eroded scarps were naturally restored to their original state as time passed.

Estimating an Incheon New Ports' allotment rate for metropolitan cargo using Logit Model - Focusing on a trans pacific route - (Logit모형을 이용한 인천 신항의 수도권 화물 분담률 추정에 관한 연구 - 미주항로를 중심으로 -)

  • Lee, Yun Chan;Lee, Taehwee;Yeo, Gitae
    • Journal of Korea Port Economic Association
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    • v.30 no.1
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    • pp.143-157
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    • 2014
  • Most metropolitan shippers (MS) have used trans pacific route (TPR) or Asia-Europe route (AEP) through Busan port (BP). If Incheon new port (INP) sets up the deep water-depths under -16m, however, there might be a change in MS's port choice behavior (PCB). In this respect, the aim of this paper is to estimate an INP's allotment rate for metropolitan cargo using Logit Model (LM) considering changing global shipping and port environment. This paper reviews previous studies related to shippers' PCB then sets up the utility function (UF) including the dummied dependent variable which is comprised of BP and INP, and some independent variables such as the frequency of liner shipping route (TPR), inland transportation fare, and the rate of container terminal service. As a result of LM analysis, BP has 0.6618 and INP has 0,3382.

A Study on Dang, jonghae's View of Medicine about Spleen, Pancreas, Stomach;Focusing on ${\ulcorner}$Jungseohoetonguigyeongjeongui${\lrcorner}$ & ${\ulcorner}$Hyeoljeungron${\lrcorner}$ (당종해(唐宗海)의 비위(脾胃)에 대한 의학적(醫學的) 연구(硏究);"중서회통의경정의(中西匯通醫經精義)"와 "혈증론(血證論)" 을 중심으로)

  • Hur, Jong-Chan;Won, Jin-Hee;Moon, Goo
    • The Journal of Traditional Korean Medicine
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    • v.15 no.1
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    • pp.1-48
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    • 2006
  • Dang, jonghae had written five books on chinese medicine, ${\ulcorner}$Hyeoljeungron${\lrcorner}$ is his most important work. He wanted to correct the fallacies of the theory of Jang(臟) and Bu(腑) by comparing with chinese and western medicine. He distinguished Bi(脾) from Cheomyuk(甛肉) by comparing the spleen with the pancreas. He recognized Stomach as the warehouse of foods, and explained that Bi took charge of digestion actually. Bi charged the function of Transportation(運化) and Blood-govering(統血) in addition to plain digestion, he wrote. Dang, jonghae regarded the metabolism of the human body as the interaction of Gi(氣), Blood (血), Water(水) and Fire(火). And he explained that Bi adjusted them. He classified Syndrome of Blood(血證) into five sorts of syndrome and presented four kinds of treatment. Especially he took a serious view of the treatment connected with Bi and Stomach. He set up the theory of Bi and Stomach(脾胃論) practically on basis of anatomy, but he didn't assorted the physiology and pathology of each organ clearly. However he proved the importance of Bi and Stomach by treating Syndrome of Blood and provided with the foundation of merging chinese and western medicine.

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Groping the Environmental Education Method Based on the Ecological Principles (생태학의 원리에 기초한 환경교육 방법의 모색)

  • 이창석
    • Hwankyungkyoyuk
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    • v.15 no.1
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    • pp.137-147
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    • 2002
  • The progress of environmental science and technology in the developed countries has been rapid in recent years. Particularly remarkable has been the advancement of various pollutant control measures, which have brought the pollution of inorganic factors such as air and water under control. In contrast, diversity of the ecosphere, of which man is a part, is being steadily Impoverished and the biological community is getting unvaryingly uniform. These phenomena were brought about by the expansion of artificial environment such as new industrial complexes, transportation facilities and urban development. Man has constructed uniform and artificial environment, believing in the premise of confrontation with nature, to such a scale that the natural environment and biological community have lost their balance. This will increasingly endanger the soundness of the biotic environment of nature, which constitutes the potential foundation both for the survival environment of man as biological entity and for the development of human civilization. In order to guarantee the soundness of man's body, intelligence and sensitivity as wholesome gene Pool on the earth and for the future of man, primarily important environmental education is the understanding of how man can everlasting exist in and with the survival environment. In view of this reality, it is vitally important to create ecologically diverse and well-balanced environment with living materials, i.e., vegetation in order to secure lasting survival environment for man. This task is urgently required in highly artificial environment where non-biological materials have forced the impoverishment of the biological community. Therefore, environmental education for the future should not be totally oriented to technology as that in the past nor it is limited to the medical aspect where well-being of human is the sole object of concern. That is to say, environmental education for the future should be one that provides knowledge that human can understand his place based on the ecological concept and thereby make him to have ethical consciousness that he can control his behavior within the reasonable level for ecological niche who he is located.

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Perception Survey on the Necessity of Improvement for the Standard Buoys Fouling Maintenance

  • Yoo, Yun-Ja;Kim, Tae-Goun;Gug, Seung-Gi
    • Journal of Navigation and Port Research
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    • v.43 no.2
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    • pp.93-100
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    • 2019
  • In 2001, about 20 years after the introduction of the standard buoys, the natural environment and maritime traffic flow changes in the waters near Korea and the necessity of improvement of the AtoN (Aids to Navigation) maintenance was suggested. The IALA provides guidelines for maintenance and management of AtoN, and Korea provides guidelines for the management and operation of standard buoys by means of the Enforcement on the AtoN laws. The objective of this study was to investigate the installation status and the repair status of the standard type buoys by sea area in order to improve the management and operation of the steel standard buoys. In addition, a survey was conducted on the improvement of the steel buoy fouling and the improvement of the lifting inspection cycle towards on the AtoN managers and producers of the representative authority by sea area. In the case of LL-26 (M) buoy type, the standard type buoy installation status of Korea in 2017 was 57.1%, and the LL-26 (M) type was 58.9% showing the highest repair rate. According to the results of the survey on buoys fouling, 51.2% were caused by the attachment of shellfish, and 43.2% were caused by bird feces. The results of the survey on the improvement of the regular buoy inspection cycle showed that the measures are to maintain the current inspection period of 2 years regardless of the characteristics of the sea area (water depth, inside and outside port, buoy size, etc.).

An Comparative Analysis of Certification Results for Pre-Certified Office Buildings according to G-SEED Revisions (녹색건축 인증제도 업무용 건축물 개정 전·후 인증결과 비교분석)

  • Yun, Yo-Sun;Chae, Chang-U;Kim, Yu-Jin
    • Journal of the Architectural Institute of Korea Planning & Design
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    • v.34 no.8
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    • pp.51-58
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    • 2018
  • G-SEED has been introduced with the aim of reducing energy use and resources since 2002, as the system of certificating environmental friendliness of buildings to create comfortable environment. This study analyzed the changes of certification standard of G-SEED since the revision in 2016, comparing certification results of office buildings by grade, category and certification items between G-SEED 2013-2 version and revised version of 2016. Also, this study analyzed the average points and their standard deviation of certification items including both deleted items and newly added items and extracted items needed to be reviewed in the future revision. In the revision, G-SEED has been extended its certification system to involve existing buildings and Innovative Design categories newly introduced with revising the certification items and difficulties. In revised version of G-SEED, the certification grade appeared to change its acquisition ratio decreasing Green2 and increasing Green4, during Green1 and Green3 were similar in proportion. The average scores by categories appeared decrease in Energy and Environmental Pollution category and Materials and Resources category, on the other hand, Maintenance category appeared the highest increase in the average score. Otherwise, Land Use and Transportation, Water Circulation, Ecology, Indoor Environment categories appeared similar average scores both version of G-SEED. In addition, the Innovative Design which was newly introduced category, seems to expect gradual gaining high scores according to technology development in future, although its possession has shown lower scores in revised version.

Information security auditing Framework in Industrial control system (산업제어시스템 정보보안 감리 프레임워크 연구)

  • Lee, Chul-Soo
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.18 no.1
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    • pp.139-148
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    • 2008
  • Information technology have led to change the automation of large industrial control system as well as business system and environments. Industrial control system(ICS) is vital components of most nation's critical infrastructures such as electricity, natural gas, water, waste treatment, transportation and communication that are based of national security, safety of citizen and development of national economy According to the change of business environment, organizational management pushed integration all of the system include MIS and ICS. This situation led to use standard information technologies for ICS, this transition has been to expose ICS to the same vulnerabilities and threats that plague business system. Recently government obliged owners of the public information system to audit for safety, efficiency and effectiveness, and also obliged the owners of national infrastructure to improve their system security as a result of vulnerability analysis. But there doesn't prepare a security architecture and information security auditing framework of ICS fur auditing. In this paper, I suggested the security architecture and information security auditing framework for ICS in order to prepare the base of industrial system security auditing.

Intrusion Detection Methodology for SCADA system environment based on traffic self-similarity property (트래픽 자기 유사성(Self-similarity)에 기반한 SCADA 시스템 환경에서의 침입탐지방법론)

  • Koh, Pauline;Choi, Hwa-Jae;Kim, Se-Ryoung;Kwon, Hyuk-Min;Kim, Huy-Kang
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.22 no.2
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    • pp.267-281
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    • 2012
  • SCADA system is a computer system that monitors and controls the national infrastructure or industrial process including transportation facilities, water treatment and distribution, electrical power transmission and distribution, and gas pipelines. The SCADA system has been operated in a closed network, but it changes to open network as information and communication technology is developed rapidly. As the way of connecting with outside user extends, the possibility of exploitation of vulnerability of SCADA system gets high. The methodology to protect the possible huge damage caused by malicious user should be developed. In this paper, we proposed anomaly detection based intrusion detection methodology by estimating self-similarity of SCADA system.