• Korean Chemical Engineering Research
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• v.44 no.3
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• pp.265-269
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• 2006

Considerable attention has been given to supply chains and their management in order to increase competitiveness in current ever-increasing business environments. The attention is due to the common belief that SCM contributes to reducing the redundancy between its supply chain entities and increasing profits correspondingly. However implementing SCM in actual industries involves a large number of difficulties unexpected before. In this paper, experiences in implementing SCM in a semiconductor manufacturing enterprise are discussed with some remarks on how process systems engineering can contribute to establishing SCM. It is hoped that the lessons of the specific enterprise can be of good help to others as well.

• Proceedings of the KIEE Conference
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• 2006.11a
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• pp.170-173
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• 2006

2006년 9월 1일에 제정된 독립사업부제는 각 단위별로 자율적인 운영권을 가지면서 비용 등에 대해서도 스스로 책임지도록 하는 제도이다. 배전계통의 사업구역 분할로 시작된 배전 사업부제는 독립 재무제표를 통해 경영실적이 드러나기 때문에 경영혁신과 원가절감 경쟁을 유도할 수 있다는 게 특징이다. 이런 체제의 변화는 기업의 규제 시스템에도 새로운 변화가 필요하게 될 것이다. 하지만 서로 다른 규모와 환경을 가진 사업부들을 하나의 기준으로 평가하는 것은 어려운 일이다. 그래서 본 논문에서는 배전 사업부제로 인해 나눠진 사업부들의 경제성과 상대적인 가치를 평가할 수 있는 방법 중의 하나로 세계적으로 널리 쓰이고 있는 Data Envelopment Analysis를 제안한다. 그 결과를 통해서 사업부에 대한 경영 평가나 각 사업부가 더 높은 경제성을 갖출 수 있는 RPI-X regulation을 수행하는데 하나의 모델로서 사용될 수 있을 것이다. RPI-X regulation에서 X값을 결정하는 것은 비용 경쟁력을 향상시키는 비율을 나타내기 때문에 적절한 X값을 찾는 것이 가장 중요하다고 하겠다. 이 때 여러 개의 입력과 여러 개의 출력을 가지는 문제에 대해서 쉽게 결과를 나타낼 수 있는 Data Envelopment Analysis를 X를 결정하는 방법으로 사용하였다. 그리고 사업부들의 노동력과 선로긍장과 용량 등의 값을 입력으로 하고 고객호수와 판매량을 결과로 하여 RPI-X regulation의 적절한 X값을 찾는 예를 통하여 이 방법이 실제적으로 어떤 효과가 있는지 확인해보았다. 본 논문에서는 분화된 사업부들에 대하여 Data Envelopment Analysis 기법을 이용하여 RPI-X regulation을 수행하였고 결과적으로 본 논문에서 제안한 방법을 통하여 분화된 배전 시스템에도 적용할 수 있는 가능성을 보였다.

• Korean Security Journal
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• no.49
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• pp.133-154
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• 2016

The Seoul subway system has one of the highest transport shares in the city of Seoul. A high number of passengers means that a high level of crimes of all kinds occur on the city's subway system. As such, Seoul Metro, created the Subway Protective Guards System in 2009, in an effort to enhance safety on the subway. But this innovative new system did not resolve problems. In fact, many citizens came to question the effectiveness of the new system, as it did not yield tangible results. This study seeks to deduce the problems and activation strategy of the Subway Protective Guards System. An in-depth study was conducted by interviewing subway protective guards who were squad leaders with five or more years of relevant work experience. Semi-structured interview analysis was utilized to evaluate their responses. Specifically, their responses were deduced to identify the strengths and weaknesses internal to the system and the opportunities and threats posed by the environment external to the system. This study presents measures to improve the system based on the aforementioned analysis. Measures for improvement focused on the following areas: the adoption of an education system in response to terror; recruitment and the possibility of becoming a permanent employee; obtaining partial judicial powers; improvement of work environment; and intensifying the promotion of the system.

• Informatization Policy
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• v.21 no.4
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• pp.20-39
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• 2014

The age of big data has not only opened new opportunities for economic growth in various industries, but it has also created new problems related to personal information protection and privacy invasion. Given this situation, Korea's communications commission has proposed a big data guideline that specifies how companies should collect and utilize personal information in the big data environment. However, this guideline is more focused on industrial development than personal information protection, and it contains many features that conflict with personal information protection law as it currently exists. As a result, civic groups strongly oppose the guideline, as it may create serious privacy issues for subjects of information gathering. Thus, this paper analyses the limitations of the guideline by comparing it with domestic and foreign laws about personal information protection and privacy. We also discuss the direction of legalization and institutionalization with respect to the secure use of big data.

• Journal of the Korean Institute of Telematics and Electronics C
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• v.36C no.10
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• pp.39-46
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• 1999

In this paper, we propose new hardware architecture of a fast searcher for an initial code acquisition in wideband CDMA wireless local loop systems. The proposed searcher uses double-dwell serial search algorithm and has N active correlators for the high performance code acquisition. Since the N active correlators are designed with pipelined architecture, it is possible to reduce the hardware complexity with only one energy calculation. Our architecture is designed using VHDL to meet wideband CDMA wireless local loop standard and verified under JTC wideband channels. Average code acquisition time of the proposed fast searcher which has 16 correlators is about 40 seconds in case of initial installation and 0.16 seconds when a base station is known. The verified fast searcher is synthesized with in $0.6\mu\textrm{m}$ LG library. The synthesized searcher has 15.8K rates when the number of 4he correlators is 16.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.3
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• pp.97-103
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• 2020

Linux Cgroups takes a fundamental role for sharing system resources among multiple containers on container-based cloud computing environment. Especially for I/O resource, Linux Cgroups supports a mechanism for sharing I/O bandwidth in proportion to I/O weight. However, the current mechanism of Linux Cgroups using BFQ I/O scheduler seriously degrades the I/O performance with high bandwidth storage device such as NVMe SSDs. In this paper, we proposed a new feedback based I/O bandwidth sharing scheme for Linux Cgroups which allocates I/O credits to containers according to I/O weights and adjusts the amount of credits to performance fluctuation of NVMe SSDs. The proposed scheme is implemented on Linux kernel 5.3 and evaluated. The evaluation results show that it can share the I/O bandwidth among multiple containers proportionally to I/O weights while improving I/O performance more than twice as high as the existing scheme.

• Journal of the Korean Association of Geographic Information Studies
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• v.21 no.3
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• pp.149-161
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• 2018

As a result of analyzing the relationship between the smart growth principle and the regenerating factors of the port waterfront city, it was found to be highly related to the port waterfront regeneration plan. Factors that are related to the application of smart growth principle derived from association analysis are as follows: ⯈ community development suitable for walking ⯈ differentiated and attractive community building with definite place, ⯈ open space, farmland, beautiful natural scenery, environmental preservation, ⯈ strengthening and inducing development for existing communities, and providing diversity of transportation options. However, in the Jeju port redevelopment plan, the principles such as ⯈ complex land use ⯈ advantage of high-density architectural design method, ⯈ various housing opportunities and options, etc., need to be applied in implementation design. Since Jeju city and Jeju port possess the strong characteristic features of port waterfront city, so it is necessary to develop jointly applying smart growth principle through integrated port waterfront city regeneration plan.

• Journal of Digital Convergence
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• v.16 no.4
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• pp.329-334
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• 2018

According to the textbook utilization survey, university students buy 6.4 books and spend 94,000 won per semester. However, nearly half of books are left unused. Therefore many students buy used textbooks instead of buying new books at a fixed price. The existing used textbook trading platforms support basic functions, but don't support textbook recommendation function and reference book recommendation function. In this paper, we developed a used textbook trading platform BookCue that provides textbook recommendation function, reference book recommendation function, and consignment trading function reflecting the regional characteristics. It is expected that will contribute to reduce university students' burden that buying textbook by forming textbooks trading environment and preserve environment. In the near future our platform will need to expand to a platform that deals with a variety of goods, as well as used textbooks in the region.

• Monthly Duck's Village
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• s.81
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• pp.54-60
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• 2010

2006년 기준으로 1천8백만 수수의 육용오리가 사육되고 있는 영국에서는 오리 사육시 복지적인 측면에서의 생산 시스템에 대하여 여러 의견이 나오고 있다. 자연에서 물과 오리의 상관관계에도 불구하고, 오리가 몸을 담그거나 헤엄칠 수 있는 등 활동에 필요한 물을 제공해야한다는 어떠한 법적 규제도 마련되어 있지 않다. 어떤 경우에는 오리들이 머리를 물에 담글 수 있게 트러프(홈통형 물통)을 제공하기도 하지만 어떤 경우에는 니플 급수기를 통해서만 물에 접근할 수 있기도 하다. 유럽평의회는 오리들이 머리를 담그고 깃털을 적실 수 있는 형태로 물을 제공할 것을 권장한다. 우리는 이번 연구에서 오리의 복지가 자연 및 물의 접근 허용 점위와 관련이 있다는 것을 밝히고자 오리의 몸과 깃털 상태를 기록하는 한편, 물 제공에 따른 복지 수준을 평가하기 위해 3자기 행동 평가를 하였다. 오리들은 욕조(작은 연못), 트러프, 샤워시설, 니플급수기, 5주령까지 니플 급수기만 제공하고 이후 욕조를 이용하는 등의 5가지 방법으로 물에 접근할 수 있도록 하였고, 이는 1)한 시설에서 오리가 보내는 시간, 2)욕조가 주어졌을 때 오리들의 보상행동, 3) 오리들이 가장 선호하는 시설을 기록하여 오리의 행동을 평가하였다. 이를 통해 오리들이 머리를 담그고 깃털을 정리할 수 있는 물을 제공하지 않으면 오리들이 코나 깃털을 깨끗이 유지할 수 없다는 결론을 얻을 수 있었다. 중요한 것은 욕조, 트러프, 샤워기를 통해 물을 제공해 주었을 때 물에서 목욕(bathing)을 하며 보낸 시간은 모두 동일하였다는 사실이다. 그러나 니플 급수기에서 목욕행동(bathing movement)을 한 시간은 아주 짧았으며, 니플 급수기 만으로 사육되었던 오리군의 욕조시설을 제공하였을 때는 '보상 반등행동'을 보였다. 트러프나 샤워시설이 제공되었던 그룹에서는 보상행동을 보이지 않아 이러한 시설들이 욕조와 동일한 작용을 하는 것으로 볼 수 있다. 또, 오리들에게 선택권이 주어졌을 때 오리들은 욕조에서 헤엄을 치고, 샤워시설에서 물을 마시고 장난치는 것을 선호하는 것으로 나타났다. 다른 시설들이 제공되었을 때 오리들은 니플 급수기에서 거의 시간을 보내지 않았다. 이번 연구를 통하여 육용 오리의 사육 환경의 복지 개선을 위해 트러프나 샤워 시설로 실제 욕조(작은 연못) 만큼 긍정적인 효과를 얻음을 확인 할 수 있었다.

• 한국ITS학회:학술대회논문집
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• v.2007 no.10
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• pp.225-229
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• 2007

Recently, wireless sensor networks are deployed in various applications range from simple environment monitoring systems to complex systems, which generate large amount of information, like motion monitoring, military, and telematics systems. Although wireless sensor network nodes are operated with low-power 8bit processor to execute simple tasks like environment monitoring, the nodes in these complex systems have to execute more difficult tasks. Generally, MAC protocols for wireless sensor networks attempt to reduce the energy consumption using duty cycling mechanism which means the nodes periodically sleep and wake. However, in the duty cycling mechanism. a node should wait until the target node wakes and the sleep latency increases as the number of hops increases. This sleep latency can be serious problem in complex and sensitive systems which require high speed data transfer like military, wing of airplane, and telematics. In this paper, we propose a solution for reducing transmission latency through distributed duty cycling (DDC) in wireless sensor networks. The proposed algorithm is evaluated with real-deployment experiments using CC2420DBK and the experiment results show that the DDC algorithm reduces the transmission latency significantly and reduces also the energy consumption.