• PNF and Movement
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• 제22권1호
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• pp.71-80
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• 2024

Purpose: The purpose of this study is to compare the effects of proprioceptive neuromuscular facilitation (PNF) stretching, based on ballistic stretching and the contract-relax technique, on hip joint flexibility and muscle tone in adults with shortened rectus femoris muscles. Methods: The study involved 40 adults with shortened rectus femoris muscles, identified using the modified Thomas test. Participants were randomly divided into two groups: PNF stretching, employing the contract-relax technique, and ballistic stretching. Measurements included muscle tension, hip joint range of motion, and muscle characteristics. The rectus femoris muscle shortening effect was confirmed by the modified Thomas test, while the flexibility effect was assessed through hip joint motion range. The muscle tension effect was determined using Myoton-PRO. Results: Both stretching methods resulted in significant improvements in modified Thomas test angles and frequency, with the PNF stretching group showing notably greater changes. However, neither stretching method significantly affected decrement or stiffness measurements. These findings suggest that PNF stretching may be more effective for certain outcomes compared to ballistic stretching. Conclusion: In summary, both stretching methods positively influenced flexibility and muscle tension, with PNF stretching showing a greater impact. These findings highlight the importance of selecting the appropriate stretching technique for achieving functional improvements in muscles, which could serve as valuable indicators for preventing and treating muscle injuries in both sports and daily activities.

• 한국환경과학회지
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• 제23권2호
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• pp.231-238
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• 2014

There were many attempts to increase the level of environmental cooperation in Northeast Asia. However, intergovernmental cooperation has not brought a substantial effects so far. This article aims to provide a model for multilateral joint research of environmental technologies. Each field of environmental problem requires a Consortium of joint research team and R & D mechanism. This model emphasizes joint-funding, tax-break for environmental investment and the importance of multilateral contract.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.997-1002
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• 2009

The local loosening of ballast supporting railway tract cause a differential vertical tract settlement. In the bridge, the temperature change make bridge deck to contract and expand, and this movement cause local loosening of ballast on the bridge expansion joint. Therefore, the evaluation of the status of ballast on the bridge expansion joint is important for the track maintenance of the high-speed railway. In this paper, hwaw method was applied to evaluate the status of ballast on the bridge expansion joint. HWAW method is non-destructive test to evaluate 2-D shear wave velocity map along the railway. Shear wave velocity is directly related with status of ballast. In this research, hwaw method was applied two different types of bridges and determine the degree and the range of the ballast loosening caused by movement of the bridge expansion joint.

• 한국건설관리학회논문집
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• 제7권3호
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• pp.65-75
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• 2006

주한 미군의 EC(Engineering/Construction) 시장에서 최근 나타나는 경향은: (1) MATOC(Multiple Award Task Order Contract)의 도입: (2)프로젝트의 대형화: 그리고 (3)대형 미국 EC회사들의 주한 미군 시장 진입으로 요약된다. 이러한 새로운 경향에 대한 이해를 바탕으로, 본 연구는 주한 미군 EC 시장의 변화를 시공관리 주체의 변화에 초점을 맞추어 분석한다. 구체적으로 살펴보면, 주한 미군 EC 프로젝트들은 FED에 의해 관리되어 왔다. 그러나 최근에는 대형 미국 민간 EC 회사들이 한국에 진입하여 FED의 시공관리 역할을 대체하고 있다. 이러한 현상은 향 후 10여 년 간의 LPP(Land Partnership Plan: 한미연합 토지 관리계획)에 의한 한국에서의 비즈니스 기회와 시공관리 주체의 민영화를 통해 군 관련 공사비를 절약하려는 미 정부의 의도에 따라 가속화 되고 있다. 이러한 시장의 변화는 미국 대형 EC 회사들과의 JV(Joint Venture)를 통해 외국 시장에 관한 정보를 획득하고 선진 시공 관리 기술을 배울 수 있는 기회가 되기 때문에, 주한 미군 한국 EC 시장에 진입하는 미국의 대형 EC 회사들은 주한 미군 공사를 수주해 온 국내 EC 회사들에게는 위협임과 동시에 기회일 수 있다.

• Journal of Information Processing Systems
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• 제19권2호
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• pp.240-257
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• 2023

The industrial Internet of Things (IIoT) is characterized by intelligent connection, real-time data processing, collaborative monitoring, and automatic information processing. The heterogeneous IIoT devices require a high data rate, high reliability, high coverage, and low delay, thus posing a significant challenge to information security. High-performance edge and cloud servers are a good backup solution for IIoT devices with limited capabilities. However, privacy leakage and network attack cases may occur in heterogeneous IIoT environments. Cloud-based multi-party computing is a reliable privacy-protecting technology that encourages multiparty participation in joint computing without privacy disclosure. However, the default cloud selection method does not meet the heterogeneous IIoT requirements. The server can be dishonest, significantly increasing the probability of multi-party computation failure or inefficiency. This paper proposes a blockchain and smart contract-based optimized cloud node selection framework. Different participants choose the best server that meets their performance demands, considering the communication delay. Smart contracts provide a progressive request mechanism to increase participation. The simulation results show that our framework improves overall multi-party computing efficiency by up to 44.73%.

• 한국건설관리학회논문집
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• 제3권3호
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• pp.103-111
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• 2002

공동도급은 상호 수행하기를 원하는 프로젝트가 있을 때, 시장성확보, 조직, 프로젝트 수행 등의 이유로 룰 이상의 회사가 함께 힘을 합쳐 조직을 구성하는 것을 말한다. 공동도급은 상호 보완하는 것에 기초하게 되는데 기술력, 설계-시공능력, 지리적 위치, 자본력 등 수주를 하기 위하여 반드시 필요한 요소가 부족할 때 이러한 취약성을 극복하기 위하여 만들어지는 것이 기본적인 취지이다. 본 연구의 목적은 효율적인 공동도급 운영모델에 관한 연구로서 국내 대규모 건축공사 사례를 중심으로 공동도급의 발전 방향을 제시하고 합리적인 조직을 구성하는 대안를 제시하는데 그 목적이 있다.

• 무역상무연구
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• 제72권
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• pp.1-24
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• 2016

This study focused on getting clear understanding on the legal bases in terms of plurality of obligors and plurality of obligees through a analysis the PICC(2010) which has been standing firmly as the general principles of international commercial contract. Related to the title of this paper, PICC are dealing with not only plurality of obligors but plurality of obligees. The contents of the former are as follows; presumption of joint and several obligations and obligee's rights against joint and several obligors (arts.11.1.1, 11.1.2, 11.1.3), availability of defences and rights of set-off and effect of performance and set-off (arts.11.1.4, 11.1.5), effect of release or settlement and effect of expiration or suspension of limitation period (arts.11.1.6, 11.1.7), effect of judgment (art.11.1.8), apportionment among joint and several obligors and extent of contributory claim (arts.11.1.9, 11.1.10), rights of the obligee, defences in contributory claims, inability to recover (arts.11.1.11, 11.1.12, 11.1.13) and so on. On the other hand the contents of the latter are as follows; definitions (art.11.2.1), effects of joint and several claims (art.11.1.2), availability of defences against joint and several obligees (art.11.2.3), allocation between joint and several obligees (art.11.1.4). The main subjects are one is when several obligors are bound by the same obligation towards an obligee, the obligations are joint and several when each obligor is bound for the whole obligation, the obligations are separate when each obligor is bound only for its share and the other is when several obligees can claim performance of the same obligation from an obligor, the claims are separate when each obligee can only claim its share, the claims are joint and several when each obligee can claim the whole performance and the claims are joint when all obligees have to claim performance together.

• 시스템엔지니어링학술지
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• 제14권1호
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• pp.52-62
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• 2018

A software support system, called procurement engineering management support system (PeMSS), is currently under development through a joint research project. The procurement-related scenarios considered in this research is as follow: an EPC (Engineering, Procurement and Construction) company receives an EPC project contract and starts the project to deliver the agreed system to the acquirer. In order to acquire the required equipments that the EPC company does not produce by itself, it eventually interacts with subcontractors, also called vendors. The EPC company responsibilities during the procurement activities are twofold. First, the EPC company has to guarantee that it has ordered the equipment, through issuing Purchase Order (PO), based on the requirements stated in the contract. Second, the EPC company has to verify that the received equipment designs, called Vendor Print (VP), meet the specifications in the PO, before finally acquiring the equipments. During our survey study, we discovered that EPC company takes a lot of time and effort to create PO and verify VP, mainly because these activities are performed manually by the responsible engineers. Therefore, we intent to support the above activities by developing a support system to the legacy procurement system that can trace the requirements from the contract to the PO and VP, among other functionalities. At the time of the writing of this paper, PeMMS is still under-development, thus, in this paper we focus on presenting the development steps of PeMMS using systems engineering theory and introducing the PO creation function. Wholly, PeMSS attempts to reduce the time and effort of engineers on the procurements activities while also increasing the quality of the procurement outcomes.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2001년도 춘계학술대회 논문집
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• pp.24-29
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• 2001

Despite of the introduction some sorts of the contract and the bid method like CM(Construction management) that will be efficient to manage the construction project. Korean agencies limit to control project management to do large public constructions. In the case of Taiwan, THSRC is apply J/V system in the public construction project, they are accomplishing that expend optimal the cost and save the construction time. To success J/V it has two factors, one is risk management and another is sharing information of construction project. Therefore, we will study to introduce J/V system to our construction project.

• 한국멀티미디어학회논문지
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• 제11권12호
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• pp.1730-1738
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• 2008

Quality of Service (QoS) Guarantees grant ways for service providers to establish service differentiation among subscribers. On the other hand, service subscribers are also assured the level of service they paid for. In addition, the efficient level of service quality can be selected according to the subscribers' needs thus ensuring efficient use of available bandwidth. While network utility optimization techniques assure certain QoS metrics, a number of situations exist where some QoS goals are not met. The optimality of the network parameters is not mandatory to guarantee specified QoS levels. This paper proposes a joint data rate and power control scheme that guarantees service contract QoS level to a subscriber using Goal Programming. In using goal programming, this paper focuses on finding the range of feasible solutions as opposed to solving for the optimal. In addition, in case no feasible solution is found, an acceptable compromised solution is solved.