• International Journal of Computer Science & Network Security
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• 제21권5호
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• pp.217-221
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• 2021

Recent studies have indicated that mobile markets harbor applications (apps) that are either malicious or vulnerable, compromising millions of devices. Some studies indicate that 96% of companies' employees have used at least one malicious app. Some app stores do not employ security quality attributes regarding authorization, which is the function of specifying access rights to access control resources. However, well-defined access control policies can prevent mobile apps from being malicious. The problem is that those who oversee app market sites lack the mechanisms necessary to assess mobile app security. Because thousands of apps are constantly being added to or updated on mobile app market sites, these security testing mechanisms must be automated. This paper, therefore, introduces a new mechanism for testing mobile app security, using white-box testing in a way that is compatible with Bring Your Own Device (BYOD) working environments. This framework will benefit end-users, organizations that oversee app markets, and employers who implement the BYOD trend.

• 한국정보과학회논문지:시스템및이론
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• 제32권5호
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• pp.219-231
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• 2005

많은 Application이 QoS(Quality of Service)를 요구한다. 본 논문에서는 시스템 에어리어 네트?에서 QoS의 일종인 성능 예측성에 촛점을 맞춘다. 예측성을 만족시키기 위해 네트?상의 모든 통신 스트림이 정적으로 스케줄된다고 가정할 때, 각 네트웍 인터페이스는 정해진 스케줄을 제 때에 실행하여야 하며 이를 위해서는 각 인터페이스의 시간베이스가 모두 동기화 되어야 한다. 본 논문에서는 이 동기화 문제를 다루었다. 동기화 문제를 해결하기 위해서, 본 논문에서는 링크 레벨 흐름 제어 신호를 이용해서 기 제안된 FM-QoS(1) 기법을 확장하였다. FM-QoS는 네트웍이 하나의 스위치로만 구성될 때 가능한 동기화 기법이다. 본 논문에서는 임의의 망구조에서 1) 네트? 인터페이스들이 동기화되기 위한 흐름 제어신호의 조건 (동기화 스케줄로 칭함)을 규정하고, 2) 동기화 스케줄의 정확도를 분석하였다. 제안한 방식의 실례를 보이기 위해서, 하나의 스위치로 구성된 네트월과 여러 개의 스위치로 구성된 트리 구조 네트웍에서 각기 동기화 스케줄을 예시하고 이의 정확도를 수치적으로 분석하였다. 분석된 정확도가 실제 시스템에서 어느 정도의 값을 갖는지를 이해하기 위해서, Myrinet 스위치(2)로 구성된 망에 대해서 실험하였다. 실험 중 관찰된 최대 정확도의 에러는 9.2 마이크로 세컨드이며, 이 수치를 바탕으로 본 논문은 제안한 동기화 알고리즘이 시스템 에어리어 네트웍에서 효과적이라고 결론지었다.

• Asian-Australasian Journal of Animal Sciences
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• 제23권8호
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• pp.1049-1056
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• 2010

This study was conducted to investigate the effects of dietary glutamine (Gln) on the productive performance and egg quality of laying hens. A total of four hundred Lingnan Yellow laying hens aged 34 weeks were randomly assigned into four groups (100 laying hens/group), and fed, respectively, with diets supplemented with 0% (control group), 0.2%, 0.4%, and 0.8% Gln during the 6-week feeding period. The results were as follows. First, the productivity of laying hens fed with 0.8% Gln in diet was significantly increased (p<0.05); however, the egg quality (egg weight, yolk weight, shell weight, egg shape index, shell thickness, shell density, shell breaking strength, yolk color, yolk index, and Haugh unit) was not affected compared with that of the control group (p>0.05). Second, luteinizing hormone (LH) (p<0.01), follicle stimulating hormone (FSH) (p<0.01), triiodothyronine ($T_3$), and tetraiodothyronine ($T_4$) contents (p<0.05) in blood of laying hens fed with 0.8% Gln in diets were also significantly improved, and greater improvement in the duodenum and oviduct structure was observed in that treatment group. This study indicated for the first time that diets with 0.8% Gln were able to increase the productive performance of laying hens through stimulating hormone secretion and better development of both the duodenum and oviduct structure in laying hens.

• 대한환경공학회지
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• 제31권4호
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• pp.308-323
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• 2009

생물활성탄 공정은 정수처리에서 획기적인 공정으로 평가받고 있으며, 전 세계적으로 많은 정수장에서 BAC 공정을 채택하여 운전하고 있다. BAC 공정의 장점은 활성탄에 흡착된 오염물질들이 활성탄 표면에서 서식하고 있는 다양한 미생물 집합체(생물막)에 의해 생물분해되어 자연적으로 활성탄의 재생이 이루어져 활성탄 사용기간의 연장을 유도하여 정수처리 비용을 감소시킬 수 있다는 것이다. 또한, 유입수중의 생분해 가능한 유기물질들을 제거하여 배 급수관망에서 미생물의 재성장을 억제하는데 탁월하다. 그러나 BAC 공정의 효율이 활성탄 표면에 형성되어 있는 생물막에 의해 제한되어지는 문제점도 있다. 본 논문에서는 GAC에서 BAC로의 전환, BAC 생물막의 특성, 오염물질의 제거 메카니즘, BAC 공정에 영향을 미치는 인자들, BAC 공정의 제어 및 BAC 공정의 모델링에 대해 크게 여섯 부분으로 상세하게 기술하였다.

• Journal of Power Electronics
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• 제15권6호
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• pp.1601-1608
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• 2015

This paper presents a PQ control strategy for micro grid inverters with axial voltage regulators. The inverter works in the voltage-controlled mode and can help improve the terminal power quality. The inverter has two axial voltage regulators. The 1st regulator involves the output voltage amplitude and output impedance, while the 2nd regulator controls the output frequency. The inverter system is equivalent to a controllable voltage source with a controllable inner output impedance. The basic PQ control for micro grid inverters is easy to accomplish. The output active and reactive powers can be decoupled well by controlling the two axial voltages. The 1st axial voltage regulator controls the reactive power, while the 2nd regulator controls the active power. The paper analyses the axial voltage regulation mechanism, and evaluates the PQ decoupling effect mathematically. The effectiveness of the proposed control strategy is validated by simulation and experimental results.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2008년도 추계 공동 국제학술대회
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• pp.365-384
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• 2008

Many studies on ASP outsourcing area have focused on the Critical Success Factors(CSFs) of ASP outsourcing projects or on the service quality of ASP Service. But these studies have limitations to explain how to succeed in doing ASP outsourcing project. The objective of this research is to overcome this limitation by using the concept of "IT Risk" in Outsourcing. The effective control of the risks-caused during the IS outsourcing process-gives (ASP service using) users a powerful tool to minimize the risks and thus maximizes the possibility of ASP outsourcing project success. In order to perform this objective, this research set up the research model which is composed of three concepts. The three concepts are 1. Undesirable Outcomes(:UO) as IT outsourcing Risks, 2. The Source of Risks(:SOR) influencing the UO, and 3. the intention to get/execute Real Option Portfolio to control the risk level of SORs and UOs. This research has some important and interesting implications on the ASP outsourcing area. First, this research classifies the risk factors as three concepts and finds the interactions among them. Second, Using Real Option portfolio can control the risks effectively occurred during outsourcing projects. Third, Vendors(ASP service providers) can offer users IN TIME the options which can minimize the occurrence of risks.

• Animal Bioscience
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• 제34권7호
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• pp.1089-1099
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• 2021

With the development of sequencing technology, numerous, long noncoding RNAs (lncRNAs) have been discovered and annotated. Increasing evidence has shown that lncRNAs play an essential role in regulating many biological and pathological processes, especially in cancer. However, there have been few studies on the roles of lncRNAs in livestock production. In animal products, meat quality and lean percentage are vital economic traits closely related to adipose tissue deposition. However, adipose tissue accumulation is also a pivotal contributor to obesity, diabetes, atherosclerosis, and many other diseases, as demonstrated by human studies. In livestock production, the mechanism by which lncRNAs regulate adipose tissue deposition is still unclear. In addition, the phenomenon that different animal species have different adipose tissue accumulation abilities is not well understood. In this review, we summarize the characteristics of lncRNAs and their four functional archetypes and review the current knowledge about lncRNA functions in adipose tissue deposition in livestock species. This review could provide theoretical significance to explore the functional mechanisms of lncRNAs in adipose tissue accumulation in animals.

• 한국정밀공학회지
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• 제22권12호
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• pp.77-86
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• 2005

This paper is about the development of Automatic FPC(flexible printed circuit) punching instrument for the improvement of working condition and cost saving. FPC is used to detect the contact position of keyboard and button like a cellular phone. Depending on the quality of the printed ink and position of reference punching point to the FPC, the resistance and current are varied to the malfunctioning values. The size of reference punching point is 2mm and the above. Because the punching operation is done manually, The punching accuracy is varied with operator's condition. Recently, The punching accuracy has deteriorated severely to the 2mm punching reference hall so that assembly of the K/B has hardly done. To improve this manual punching operation to the FPC, automatic FPC punching system is introduced. Precise mechanical parts like a 5-step stepping motor and ball screw mechanism are designed and tested and low cost PC camera is used fur the sake of cost down instead of using high quality vision systems for the factory automation. Test algorithms and programs showed good results to the designed automatic punching system and led to the increasement of productivity and huge cost down to law material like FPC by avoiding bad quality.

• Journal of Communications and Networks
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• 제4권3호
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• pp.221-229
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• 2002

Adaptability is the most promising feature to be applied in future robust multimedia applications. In this paper, we propose the Direct Algorithm to improve the degree of satisfaction at heterogeneous receivers in multi-layered multicast video environments. The algorithm relies on a mechanism that dynamically controls the rates of the video layers and is based on feedback control packets sent by the receivers. The algorithm also addresses scalability issues by implementing a merging procedure at intermediate nodes in order to avoid packet implosion at the source in the case of large multicast groups. The proposed scheme is optimized to achieve high global video quality and reduced bandwidth requirements. We also propose the Direct Algorithm with a virtual number of layers. The virtual layering scheme induces intermediate nodes to keep extra states of the multicast session, which reduces the video degradation for all the receivers. The results show that the proposed scheme leads to improved global video quality at heterogeneous receivers with no cost of extra bandwidth.

• 아시안잔디학회지
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• 제25권1호
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• pp.43-47
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• 2011

크리핑 벤트그래스는 골프장의 그린과 페어웨이에서 가장 널리 이용되는 종중의 하나이다. 크리핑벤트그래스는 곰팡이병류인 동전마름병에 가장 취약한 종이며 동전마름병은 잔디의 잎에서 그 병반이 나타나며 높은 습도와 낮의 온도 그리고 비교적 낮은 밤의 온도에서 발병률이 더 높은 것으로 알려져 있다. 곰팡이 병균류를 제어하기 위한 약제들에 관한 이전의 연구에서는 혼합된 약제에 의해 관리된 잔디는 단일품에 의해 관리된 잔디에 비해 더 좋은 잔디의 질을 나타내지 못했다. 이 부분에 대한 정확한 원인이 규명이 되지 않았으며 비료프로그램과 환경에 의한 영향이 약제의 사용과 잔디의 질을 나타낸다는 보고가 있다. 본 연구에서는 잔디의 질병이 가장 많이 발생하고 고온다습한 여름철에 골프코스 그린에서 발생하는 동전마름병의 방제 할 수 있는 약제프로그램과 잔디의 품질에 대한 영향을 규명하기 위해 수행되었다. 총 9가지 약제조합이 이 연구에서 사용이 되었다. 동전마름병에 의한 피해와 잔디의 품질이 G-2/L-93 혼합된 크리핑벤트그래스 그런에서 측정이 되었다. Fore를 제외한 모든 조합이 동전마름병의 방제에 좋은 결과를 보여 주었다. Fore의 경우 동전마름병의 피해가 30%까지 나타났으며 대조군과 차이가 나타나지 않았다. Fore의 낮은 잔디품질은 동전마름병의 방제가 잘 이루어지지 않았기 때문으로 나타났다.