밤 생산 임가의 경영성과 향상을 위한 경영진단 연구

전준헌(Jun-Heon Jeon),원현규(Hyun-Kyu Won),유병일(Byoung-Il Yoo),이호승(Ho-Seung Lee),이숙향(Sook-Hyang Lee),한상열(Sang-Yoel Han) 한국산림휴양복지학회 2012 한국산림휴양학회지 Vol.16 No.4

무선 센서 네트워크에서 군 감시 정찰을 위한 저 지연 데이터 전송 메커니즘

전준헌,이성춘,Jeon, Jun-heon,Lee, Sung-choon 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.4

One of the most important issues in Wireless Sensor Networks is to save energy of the sensor node. But transmission latency is also the problem to solve for some applications such as military surveillance, object tracking. In these applications sensor node needs to send lots of data in limited time when an even such as object appearance occurs. So a delay efficient data transmission method is required. In this paper we propose a MAC protocol adequate for those applications. This paper proposed a low delay data transmission mechanism for military surveillance in wireless sensor networks. In the MAC protocol, a receiver node sends another beacon frame to sender node after receiving data packet. Using this second beacon frame, fast hop-to-hop transmission can be performed. Results have shown that the proposed MAC control mechanism outperformed RI-MAC protocol in the terms of latency. 무선 센서 네트워크에서 중요한 이슈 중 하나는 센서 노드의 에너지 절약이다. 그러나 군 정찰, 물체 추적과 같은 응용 분야에서는 지연 또한 중요한 문제이다. 이러한 응용에서 센서 노드는 물체가 감지되면 제한된 시간 내에서 많은 양의 데이터 패킷을 전송해야 한다. 그렇기 때문에 지연에 효율적인 데이터 전송 방법이 필요하다. 본 논문에서는 이러한 응용에 적합한 MAC 프로토콜을 제안한다. 제안하는 MAC 프로토콜은 무선 센서 네트워크에서 군 감시 정찰을 위한 저 지연 데이터 전송 메커니즘이다. MAC 프로토콜에서, 수신 노드는 송신 노드에서 데이터 패킷을 수신한 후 두 번째 비콘 프레임을 보낸다. 이 두 번째 비콘 프레임을 사용하여 빠른 hop-to-hop 전송이 가능하다. 성능분석을 통해 제안된 MAC 프로토콜과 RI-MAC 프로토콜을 비교하였고, 제안된 방법이 지연에 더 효율적이다.

멀티 홉 무선 센서 네트워크에서 저 지연을 지원하는 MAC 프로토콜

전준헌,김성철,Jeon, Jun-Heon,Kim, Seong-Cheol 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.2

무선 센서 네트워크에서 MAC 프로토콜은 에너지 소모의 감소, QoS 지원, 공평성 지원, 그리고 전송 지연의 감소 등과 같은 많은 해결해야 할 문제들을 가진다. 본 논문에서는 멀티 홉 무선 센서 네트워크에서 저 지연을 지원하는 MAC 프로토콜을 제안한다. 본 논문에서 제안하고 있는 LD-MAC 프로토콜은 전송 지연을 줄이기 위해 RB(rapid beacon) 프레임을 사용한다. RB 프레임은 IEEE 802.15.4의 비콘 프레임의 수정된 형태이다. 송신 노드의 적응적 wakeup을 위해 RB 프레임에는 수신 노드의 wakeup과 관계된 seed 수를 포함한다. 또한 다음 홉 수신 노드의 적응적 wakeup을 위해 RB 프레임에는 남은 데이터 패킷 길이 정보를 포함한다. LD-MAC 프로토콜은 기존에 제안된 다른 프로토콜에 비해 데이터 패킷 전송 지연에서 더 좋은 성능을 보였다. In Wireless Sensor Networks the Medium access control (MAC) protocol has many challenges to solve such as reducing energy consumption, supporting QoS(quality of service) fairness, and reducing delivery delay. This paper proposed a low-delay supporting MAC protocol in multi-hop Wireless Sensor Networks. The proposed protocol uses the RB(rapid beacon) frame for reducing delivery delay. The RB frame is a modified IEEE 802.15.4 beacon frame. For sender adaptive-wakeup, the RB frame includes a seed number for determining of a receiver wakeup time. And for next hop receiver adaptive-wakeup, the RB frame includes the length of remaining data packet information. Results showed that our LD-MAC protocol outperformed other protocol in terms of data packet delivery delay.

멀티 홉 무선센서네트워크에서 에너지와 지연에 효율적인 하이브리드 MAC 프로토콜

전준헌,김성철,Jeon, Jun-Heon,Kim, Seong-Cheol 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.2

본 논문에서는 멀티 홉 무선 센서 네트워크에서 에너지 효율적인 하이브리드(hybrid) MAC 프로토콜을 제안한다. 제안하는 MAC 프로토콜은 경쟁방식(CSMA) 방식과 비경쟁방식(TDMA) 방식을 혼합하여 사용한다. 싱크 노드로부터 멀리 떨어진 센서 노드들은 주로 데이터 측정 임무를 담당하기 때문에 데이터 발생 및 전송 트래픽이 적어 구현이 간단한 경쟁방식을 사용하는 것이 유리하다. 그러나 싱크 노드와 가까운 노드들은 데이터 측정 뿐 만 아니라 relay 노드로 동작하기 때문에 많은 데이터를 전송할 필요가 있으므로 경쟁방식을 사용하면 데이터 패킷의 충돌 및 전송지연이 증가하게 된다. 본 논문에서는 싱크 노드와 1홉 거리의 센서 노드들은 마치 비경쟁방식처럼 슬롯을 할당하여 데이터 패킷을 전송하는 메커니즘을 제안한다. 제안하는 메커니즘은 에너지 및 지연에 효율적인 장점을 가진다. 제안된 MAC 프로토콜은 유사한 다른 프로토콜에 비해 데이터 패킷 전송 지연에서 더 좋은 성능을 보였다. In this paper, we propose an energy efficient hybrid MAC protocol for multi-hop wireless sensor networks. The proposed MAC protocol used a hybrid mechanism, in which contention-based MAC protocol and contention free MAC protocol are combined. The sensor nodes located far from the sink node usually send few data packet since they try to send measured data by themselves. So contention-based MAC protocol is useful among them. But other nodes located near sink node usually have lots of data packets since they plays as a relay node. Contention-based MAC protocol among them is not suitable. Using contention-based MAC protocol in heavy data traffic environment, packet collisions and transmission delay may increase. In this paper, slot assignment between sender nodes by sink node is used. The proposed mechanism is efficient in energy and latency. Results showed that our MAC protocol outperformed other protocol in terms of data packet delivery delay and energy consumption.

무선 센서 네트워크에서 센서 노드의 잔여 에너지 기반 Wake-up 제어 메커니즘

전준헌,김성철,Jeon, Jun-Heon,Kim, Seong-Cheol 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.1

무선 센서 네트워크에서 전송 지연 및 에너지 소모의 문제들을 해결하는 것이 전체 네트워크의 수명을 연장하고 효율적인 데이터 패킷 전송을 위해 해결해야할 문제들이다. 이러한 문제들을 해결하기 위하여 다양한 MAC 프로토콜들이 제안되었다. 본 논문에서 제한하는 방식은 센서 노드의 잔여 에너지에 기반하여 노드의 wake-up 주기를 조절함으로 불필요한 idle listening을 줄여 에너지 소모를 줄인다. 제안된 제어 메커니즘은 수신자 기반의 MAC 프로토콜 중의 하나인 RI-MAC 프로토콜의 단점을 보안하여 수정하였다. 제안된 제어 메커니즘에서 수신 노드는 주기적으로 wake up하고 노드 자신의 에너지 상태에 따라서 비콘 신호를 전송한다. 뿐 만 아니라 수신 노드는 데이터 트래픽에 따라서 wake up 주기를 조절한다. 성능분석을 통하여 제안한 MAC 프로토콜이 RI-MAC 프로토콜에 비해 에너지 소모에 대하여 더 효율적임을 알 수 있었다. In dense deployments of sensor nodes in Wireless Sensor Networks, the MAC protocol has challenges to solve problems such as reducing delivery delay and reducing energy consumption. To solve these problems lots of protocols are suggested. This paper proposed a sensor nodes' residual energy based wake-up control mechanism, in which each node decides whether it wakes up or stays in sleep mode to save energy consumption by reducing unnecessary idle listening. The main idea of the wake-up control mechanism is to save node's energy consumption. The proposed wake-up control mechanism is based on the RI-MAC protocol, which is one of the receiver-initiated MAC protocols. A receiver node in the proposed mechanism periodically wakes up and broadcasts a beacon signal based on the energy status of the node. A receiver node also adjusts wake-up period based on the traffics. Results have shown that the proposed MAC protocol outperformed RI-MAC protocol in the terms of energy consumption.

무선 센서 네트워크 에서 에너지 효율적인 싱크노드 기반 MAC 프로토콜

전준헌,김성철,Jeon, Jun-Heon,Kim, Seong-Cheol 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.1

In this paper, we propose an energy efficient sink node based MAC protocol for Wireless Sensor Networks (WSNs). The proposed sink node-based MAC (SB-MAC) protocol uses a RB(rapid beacon) frame to save sender's energy consumption and to reduce transmission delay. The RB frame is a modified IEEE 802.15.4 beacon frame. The RB frame contains the length of the sender nodes data. Using this information other nodes except sender and receiver nodes can be stay sleep mode long time to reduce energy consumption. Results have shown that the SB-MAC protocol outperformed other protocols like X-MAC and RI-MAC in terms of packet delivery delay and energy consumption. The SB-MAC protocol is especially energy efficient for the networks with one sink node and many senders. 본 논문에서는 무선 센서 네트워크에서 에너지 효율적인 싱크노드 기반의 MAC 프로토콜을 제안한다. 본 논문에서 제안되는 싱크 노드 기반 MAC 프로토콜(Sink node-Based MAC: SB-MAC)은 송신자 노드의 에너지 소모를 줄이고 전송 지연을 감소시키기 위해 RB (rapid beacon) 프레임이 사용된다. RB 프레임은 IEEE 802.15.4의 비콘 프레임의 수정된 형태이다. RB 프레임에 포함된 전송 노드의 데이터 길이 정보를 이용하여, 데이터 전송에 참여하지 않는 다른 노드들이 오랫동안 sleep 모드에 머물게 함으로써 에너지 소모를 줄일 수 있다. 이를 통하여 기존의 X-MAC 및 RI-MAC 프로토콜들에 비해 데이터 전송 지연 및 에너지 소모 면에서 더 좋은 성능을 가진다. SB-MAC 프로토콜은 하나의 싱크노드와 다수의 송신 노드들로 구성되어 있는 네트워크 환경에 에너지 효율적인 프로토콜이다.

밤나무 경영 표준진단표의 개발 및 적용

전준헌 ( Jun Heon Jeon ),유병일 ( Byoung Il Yoo ),이정민 ( Jung Min Lee ),지동현 ( Dong Hyun Ji ),김연태 ( Yeon Tae Kim ),강길남 ( Kil Nam Kang ) 한국산림과학회 2012 한국산림과학회지 Vol.101 No.4

The chestnut management standard diagnostic table is developed and would be utilized in order that a manager raising chestnuts checks where the own level of management is and grasps current state of own for the purpose of planning aims and advancing toward a higher level. The developed ``Chestnut management standard diagnostic table`` consisted of 3 first classified items 19 second classified items and 2 product indicator items by the chestnut experts consultative meeting. A survey of 212 farmhouses in 4 major producing area was conducted. Except invalid survey of 53 farmers 159 farmhouses interviewed were used in analysis. Total score was calculated with sum of each item`s score. According to the survey results average score is 68.0 and Buyeo received the highest score of 69.7 and Suncheon received the lowest score of 61.8 by regional groups. The higher the group in score the better it is in output per hectare. But the property of “the ratio of the best products in total products” does not show a statistical correlation. Generally the score of ``management-based evaluation indicator part`` and ``management and sale capacity indicator part`` in Suncheon was low because of many elderly people. In part of ``manufacturing technology indicator`` as Environmentally-Friendly production is progressed in over 70% of four regions when comes to a disease and insect pest control there are rarely farmhouse having a way of crop dusting.

표고버섯 경영 표준진단표의 개발 및 현지 적용

전준헌 ( Jun Heon Jeon ),원현규 ( Hyun Kyu Won ),유병일 ( Byoung Il Yoo ),이성연 ( Seong Youn Lee ),이정민 ( Jung Min Lee ),지동현 ( Dong Hyun Ji ),김연태 ( Yeon Tae Kim ),강길남 ( Kil Nam Kang ),오득실 ( Duk Sil Oh ) 한국산림과학회 2013 한국산림과학회지 Vol.102 No.2

This study aims to develop a standard diagnostic table for management and administration that oak mushroom cultivators of forestry households can utilize. By diagnosing their current level of management with the table, the cultivators themselves will be able to grasp and address their operational challenges better. The table is composed of; questions on the status of forestry households; columns for a series of management performance indices, and; questionnaire with 4 categories and 20 subcategories to check the current level of management and administration by the households. In order to prepare the standard diagnostic table for oak mushroom management, 196 forestry households throughout 10areas-Cheong-yang, Gong-ju, Bu-yeo and Seo-cheon in Chuncheongnam-do, Mun-kyung and Ye-cheon in Gyeongsangbuk-do, Jin-an in Jeollabuk-do, Jang-heung and Jang-seong in Jeollanam-do, and Jeju Islands-were interviewed with and a total of 190 questionnaires were acquired and made use of in the result analysis. Then, the score on management level of each forestry household was determined in the way of aggregating scores from each subcategory. The overall average score of every household was calculated at 62.2 point with more than half of the respondents, 54.7%, belonging to the range of 60 to 80. When considered by regional groups, the average score of Jin-an was the lowest with 57.6 point while that of Jang-seong was the highest with 69.6 point. In case of the ‘cultivation management’ category, there were a lot of cultivators who expressed a negative awareness of the term ‘pest control’ because they had a tendency to think the term in connection with ‘herbicides or pesticides’. So it is inevitable to adapt and modify existing groups and grades to make sure that the cultivators can make a right choice without confusing the cincept ‘pest control’ with ‘herbicides or pesticides’. Meanwhile, the average scores of ‘management and administration’ categories were mostly low. It was remarkable in these categories that forestry households in Jeolla province, which had remained in lower ranks in the other three categories, recorded higher scores than those in Chungcheong province, boasting a relatively high level of management and administration.

떫은감 경영 표준진단표의 개발 및 현지 적용

전준헌 ( Jun Heon Jeon ),이성연 ( Seong Youn Lee ),이정민 ( Jung Min Lee ),지동현 ( Dong Hyun Ji ),오찬진 ( Chan Jin Oh ) 한국산림과학회 2015 한국산림과학회지 Vol.104 No.3

This study aims to develop and apply a standard management self-diagnostic table for forestry households to better manage their astringent persimmon production. The diagnostic table consisted of 3 categories (general status of a forestry household, management performance indicators, level of management) and 18 subcategories. The current management status across 241 households was surveyed among 10 chief astringent persimmon producing municipalities. Scores from the 18 subcategories were aggregated for a total score to evaluate and compare different levels of management. The respondents scored an overall average of 57.4, 62% of which were placed between 40 and 60. Upon close examination Chungcheongnam-do scored a very low score in the ‘management system-tree height’ subcategory with respect to the average score potentially because of the large population of aged trees in the region. The national average in the ‘production skills-time of fruit load adjustment’ subcategory was only 1.96 because unlike sweet persimmons astringent persimmons adjust their own load by inducing physiological fruit drop. The national average in the ‘management/sales skills-material purchase’ subcategory was 2.01; over 60% of the respondents indicated a preference for independent selection and purchase for most materials. The households preferring a group purchase tended to utilize the regional co-op.

산양삼 경영 표준진단표의 개발 및 현지 적용

전준헌 ( Jun Heon Jeon ),이성연 ( Seong Youn Lee ),이정민 ( Jung Min Lee ),지동현 ( Dong Hyun Ji ),김연태 ( Yeon Tae Kim ),강길남 ( Kil Nam Kang ) 한국산림과학회 2014 한국산림과학회지 Vol.103 No.4

This study aims to develop a standard diagnostic table for mountain ginseng so that the cultivators notonly can check their current level of management with the table, but also can understand and address operationalchallenges better by themselves utilizing the table. The standard diagnostic table consists of 3 categories and 18subcategories to diagnose the general status of forestry households, the indicators of management performance andthe level of management. To develop the table, the study conducted a survey on the actual condition ofmanagement, targeting 81 forestry households throughout 15 municipalities including Mu-ju, Jeollabukdo, andHam-yang, Gyeongsangnamdo, all of which are the chief producing districts of mountain ginseng. Then, the studycalculated total scores by regions by aggregating the scores of 18 subcategories, in order to evaluate and comparethe management level among regions based on the scores. According to the result, the average score of 81 forestryhouseholds was 57.2 point-58% of which surveyed belonged to the range of 40-60 point. Compared by regions,the average score of Jeollabukdo regions was 52.9 point, the lowest, and that of Gyeongsangnamdo regions was61.4 point, the highest. It is remarkable that among the indicators of management base, the average score of‘mounding (the height of mound)’ item was recorded rather low with 1.59 point, reflecting the fact that thecultivators tend to raise mountain ginseng with no additional mounds. As for the indicators of production skills,the average score of the pest control item was remarkably low with 1.28 point. Over 90% of cultivators answeredthat they do not usually forecast or survey the pest disease in advance. Meanwhile, it is also noticeable that theitem of sowing and planting methods, and the item of seed were both rather high, recording 4.00 and 4.47 pointrespectively. As for the item of management and sales skill, however, the score was rather low with 2.20 point,meaning that the forestry households still have a low interest in the business management.