title: Measuring TCP Congestion Control Behaviour in the Internet

authors: Eichler, Stephen John

subjects: TCP

abstract: The Internet is constantly changing and evolving. In this thesis the behaviour of various aspects of the implementation of TCP underlying the Internet are measured. These include measures of Initial Congestion Window (ICW), type of reaction to loss, Selective Acknowledgment (SACK) support, Explicit Congestion Notification (ECN) support. We develop a new method to measure congestion window reduction due to three duplicate ACK inferred loss. In a previous study 94% of classified servers showed window halving, whereas we found that 50% of classified servers exhibited Binary Increase Congestion control (BIC) or Cubic style behaviour, which is a departure from a Request For Comments (RFC) requirement to reduce the congestion window by at least 50%. ECN is predicted to improve Internet performance, but previous studies have revealed a low support for it 0.5%, and ECN connections failed at a high rate due to middlebox interference 9%; in this thesis we show a steady increase over time of ECN being implemented and supported 7.2%-10.3%. ECN testing of webservers with globally routable IPv6 adderesses showed a higher success rate 21.9%. Analysis of congestion control behaviour such as Tahoe, Reno and New Reno showed New Reno dominating more strongly than before, increasing from 35% to 70% of popular webservers. SACK sending analysis revealed that 45% of popular webservers implement it properly, as compared to 18% in earlier studies. SACK receiving analysis showed higher results to the earlier studies, with success increasing from 64.7% to 81.1%. For both of these SACK studies results for webservers with globally routable IPv6 addresses showed a higher success rate when errors remained low. Analysis of ICW indicates that 75% of popular webservers implement the older ICW regime of an initial congestion window of two or less packets, as compared to 96% in previous studies. The new regime of an ICW of three or four packets depending on segment size was implemented at 20%. We see from these results that RFCs do affect TCP implementation, but change can be slow. However we see that implementation and support for modern TCP features is increasing.

text: Measuring TCP Congestion Control Behaviour in the Internet The Internet is constantly changing and evolving. In this thesis the behaviour of various aspects of the implementation of TCP underlying the Internet are measured. These include measures of Initial Congestion Window (ICW), type of reaction to loss, Selective Acknowledgment (SACK) support, Explicit Congestion Notification (ECN) support. We develop a new method to measure congestion window reduction due to three duplicate ACK inferred loss. In a previous study 94% of classified servers showed window halving, whereas we found that 50% of classified servers exhibited Binary Increase Congestion control (BIC) or Cubic style behaviour, which is a departure from a Request For Comments (RFC) requirement to reduce the congestion window by at least 50%. ECN is predicted to improve Internet performance, but previous studies have revealed a low support for it 0.5%, and ECN connections failed at a high rate due to middlebox interference 9%; in this thesis we show a steady increase over time of ECN being implemented and supported 7.2%-10.3%. ECN testing of webservers with globally routable IPv6 adderesses showed a higher success rate 21.9%. Analysis of congestion control behaviour such as Tahoe, Reno and New Reno showed New Reno dominating more strongly than before, increasing from 35% to 70% of popular webservers. SACK sending analysis revealed that 45% of popular webservers implement it properly, as compared to 18% in earlier studies. SACK receiving analysis showed higher results to the earlier studies, with success increasing from 64.7% to 81.1%. For both of these SACK studies results for webservers with globally routable IPv6 addresses showed a higher success rate when errors remained low. Analysis of ICW indicates that 75% of popular webservers implement the older ICW regime of an initial congestion window of two or less packets, as compared to 96% in previous studies. The new regime of an ICW of three or four packets depending on segment size was implemented at 20%. We see from these results that RFCs do affect TCP implementation, but change can be slow. However we see that implementation and support for modern TCP features is increasing.

year: 2011

title: Tatua biosolids project

authors: Kandemulle Arachchilage, Samudu Manoj Kandemulla

abstract: This study investigates the potential of waste activated sludge (WAS) as a sustainable and cost-effective soil amendment for agricultural use. Through field trials, glasshouse experiments, and laboratory analyses, the research evaluates the effects of WAS on soil properties, plant growth, nutrient dynamics, and heavy metal content, comparing its performance with other organic amendments such as vermicast, chicken litter, and SustaiN™, a commercial fertilizer.
The findings reveal that WAS application significantly enhances plant growth and yield. It also improves soil fertility by increasing organic matter content and promoting root development, though its high mineralization and nitrification rates necessitate careful management to minimize nitrogen losses. Heavy metal analysis indicates that while WAS contains elevated levels of metals like chromium and lead, these remain within permissible limits and do not significantly impact plant uptake.
Cost analysis highlights WAS as the most economical option at $120/ha/yr, compared to significantly higher costs for other amendments. However, the study identifies gaps in understanding odour management, long-term environmental impacts, and the effects of WAS on livestock health, which warrant further investigation.
In conclusion, WAS demonstrates strong potential as a viable alternative to traditional fertilizers, offering a balance between cost-effectiveness, nutrient availability, and environmental sustainability. Future research should focus on long-term field trials, expanded crop studies, advanced nitrogen monitoring, and economic feasibility to optimize its use in diverse agricultural systems. This study contributes to the growing body of knowledge on sustainable soil amendments, providing valuable insights for farmers, policymakers, and researchers aiming to enhance agricultural productivity while minimizing environmental risks.

text: Tatua biosolids project This study investigates the potential of waste activated sludge (WAS) as a sustainable and cost-effective soil amendment for agricultural use. Through field trials, glasshouse experiments, and laboratory analyses, the research evaluates the effects of WAS on soil properties, plant growth, nutrient dynamics, and heavy metal content, comparing its performance with other organic amendments such as vermicast, chicken litter, and SustaiN™, a commercial fertilizer.
The findings reveal that WAS application significantly enhances plant growth and yield. It also improves soil fertility by increasing organic matter content and promoting root development, though its high mineralization and nitrification rates necessitate careful management to minimize nitrogen losses. Heavy metal analysis indicates that while WAS contains elevated levels of metals like chromium and lead, these remain within permissible limits and do not significantly impact plant uptake.
Cost analysis highlights WAS as the most economical option at $120/ha/yr, compared to significantly higher costs for other amendments. However, the study identifies gaps in understanding odour management, long-term environmental impacts, and the effects of WAS on livestock health, which warrant further investigation.
In conclusion, WAS demonstrates strong potential as a viable alternative to traditional fertilizers, offering a balance between cost-effectiveness, nutrient availability, and environmental sustainability. Future research should focus on long-term field trials, expanded crop studies, advanced nitrogen monitoring, and economic feasibility to optimize its use in diverse agricultural systems. This study contributes to the growing body of knowledge on sustainable soil amendments, providing valuable insights for farmers, policymakers, and researchers aiming to enhance agricultural productivity while minimizing environmental risks.

year: 2025

title: Kapa Haka Whakataetae Kua tini haere te kanohi o te mahi kapa haka i te ao hurihuri nei.

authors: Rollo, Te Manaaroha Pirihira

subjects: Kapa Haka

abstract: Tihei Haka! Mauriora Kapa haka (Rollo, 2006)
Ka tū te ihiihi, ka tū te wanawana o te hunga i ngā hui whakataetae kapa haka o te motu. He hui rongonui i te maramataka a te Māori ia tau ia tau, ā, he hui whakahirahira anō mō rātou mā i whakawhiti mai i tāwahi rā hoki. Mā te mahi a te kapa haka ka whakaari ngā rōpū haka i ngā mahi nō nehe rā me ngā mahi hou o te ao onāianei. Ahakoa te āhuatanga o te mahi, he taonga tuku iho nā rātou mā kua mene ki te pō.  Moe mai rā e te kāhui o ngā whetu i te pō, moe mai i te Ariki o te rangi. 

I tēnei tuhinga, e āta titiro ana 'hau ki ngā mahi hou me te āhuatanga hou kei ngā rōpū haka i te whakataetae-a-motu, arā Te Matatini me ētahi atu momo whakataetae i Aotearoa, tāpiri mai hoki ērā kei Te Moana nui a Kiwa. Ko te ingoa matua o tēnei tuhinga,  KAPA HAKA WHAKATAETAE. Kua tīni haere te kanohi o te mahi kapa haka i te ao hurihuri nei .
No reira, ko te tino pātai kei tēnei rangahau ko tērā. He aha ngā mahi hou kei te kapa haka whakataetae? Nā he hua anō hoki kei reira? Ka hāngaia tonu e te tuhinga nei  ngā hui whakataetae kapa haka mai i te tau 1972 tae noa ki te tau 2006.

Ngā ūpoko o te tuhinga whakapae
E whā ngā wāhanga ūpoko o tēnei tuhinga whakapae. Mā ngā ūpoko katoa ka kitea ai ngā momo kaupapa ake e hāngai pū ana ki te kaupapa mō te whakataetae kapa haka me ōna āhuatanga hou. He mahi whakahirahira tāku ki te whakatakoto i ngā kōrero, i ngā whakaaro, i ngā mātauranga o tēnā tangata mōhio, o tēnā tangata mātau ki roto i ngā whare māramatanga, arā ngā  wāhanga wēnā,  hei mātauranga hou mō te ao katoa.

I te ūpoko tuatahi, ka anga te titiro ki ngā whakamāramatanga o ngā tikanga-a-iwi e pā ana ki te  tūturutanga me te ao o te kapa haka. Mā wēnei whakamāramatanga hei awhi i a 'hau i taku rangahau ki te mahi onāianei o te whakataetae kapa haka. Ka whai mātauranga 'hau mō ngā tikanga o ngā kupu e rua. Ko ēnei ko te kupu  haka  te tuatahi, ā, ko te kupu  kapa haka  te tuarua. He aha ngā rerekētanga me te ōritenga o wēnei kupu rongonui? Ka anga whakamua ki ngā tūmanako me ngā ritenga o te whakataetae kapa haka a te motu mai i te New Zealand Polynesian Festival tae atu ki Te Matatini. Ko te whāinga mutunga o tēnei wāhanga, ka hoki whakanui ki te whakataetae-a-motu mai i te tau 1972 tae noa atu ki te tau 2006.

Ko te ūpoko tuarua, ka whakatakoto e 'hau ngā whakautu o ngā patapātai mai i ngā rārangi kōrero me ngā whakaaro whānui i whakahokia mai e ngā tāngata o ngā rōpū haka e whā, arā, Te Rōpū Haka o Te Kotahitanga, Ngāti Poneke Young Māori Club, ko Te Waihīrere, ā, huri atu ki Te Pou a Mangatāwhiri hoki, he rōpū i whakatūhia anō i te tau 2005. I tēnei wāhanga ka kitea ngā kōrero ātaahua, ngā mātauranga tūturu me ngā whakaaro hōhonu o ngā kaiako me ngā tāngata e tautoko ana i taku mahi kimi mātauranga.  Nā rātou ka ohorere, ka mirimiri hoki i tōku hinengaro ki ngā māramatanga hou. He tika anō te kupu ā  Pā Henare Tate nō Ngapuhi nui tonu e kī ana,  Mā te whakaatu, ka mōhio, mā te mōhio, ka mārama, mā te mārama, ka mātau, mā te mātau, ka ora   (Barlow 1991)

I te ūpoko tuatoru he whakaaturanga tēnei o āku tirohanga ki ngā āhua rerekē me ngā mahi hou i roto i ngā rōpū haka i runga i te ātamira o te whakataetae, i roto hoki i te mura o te ahi o te whakataetae. Kua tuhituhi au i ngā momo āhuatanga e pā ana ki  te taha o te kanikani, te mahi-a-korikori me ngā mahi katoa i runga i te atamira. Ahakoa iti ko tētahi atu wahanga o ērā kōrero e pā ana ki te pūoro me ōna mana kua puta i konei. Ka huri taku tuhinga ki te taha o te reo waiata, te toi whakaari me te whakaataata o ngā mahi a te Rēhia. I konei ka titiro ki te tāmoko, te pani kanohi me te pani tinana, arā he mahi hou katoa. Ko te wahanga mutunga e pā ana ki te reo Māori me te tito waiata hoki. Ahakoa he maha ngā āhuatanga, ko ngā tuhinga nei mō ia āhuatanga kia kitea ai ngā rerekēnga me ngā mahi hou i te whakataetae kapa haka o te ao Māori. No reira te nuinga engari ko wētahi i whakaurua mai i ētahi atu iwi ō tāwahi.       

Ko te ūpoko whakamutunga, ka hāngai taku titiro ki te ao o te whakataetae, arā, ki ngā whakaaro me te tā o te hinengaro me te ngākau o te tangata. Ka peka haere ki te whakatū o ngā rōpū whakataetae me te parakatihi o ngā waiata, ngā haka me ngā whakaritenga mo te whakataetae kapa haka. Ko te kōrero whakamutunga, ka huri ki wētahi atu o ngā whakataetae mai i Te Kuki Airani, i Tahiti me Hawaii hoki. Āe mārika, ka ora te ao o te whakataetae puta noa i te ao nui. Ki ahau, mā tēnei tuhinga hei whakapuare ngā hurihanga o te ao Māori me te ao o te kapa haka. Ka ea, he tika hoki te whakataukī rā,  ka pū te ruha, ka hao te rangatahi    (Ryan 1995), arā ka kimi i ērā e pīataata ai o rātou wairua, hinengaro, ngākau.

text: Kapa Haka Whakataetae Kua tini haere te kanohi o te mahi kapa haka i te ao hurihuri nei. Tihei Haka! Mauriora Kapa haka (Rollo, 2006)
Ka tū te ihiihi, ka tū te wanawana o te hunga i ngā hui whakataetae kapa haka o te motu. He hui rongonui i te maramataka a te Māori ia tau ia tau, ā, he hui whakahirahira anō mō rātou mā i whakawhiti mai i tāwahi rā hoki. Mā te mahi a te kapa haka ka whakaari ngā rōpū haka i ngā mahi nō nehe rā me ngā mahi hou o te ao onāianei. Ahakoa te āhuatanga o te mahi, he taonga tuku iho nā rātou mā kua mene ki te pō.  Moe mai rā e te kāhui o ngā whetu i te pō, moe mai i te Ariki o te rangi. 

I tēnei tuhinga, e āta titiro ana 'hau ki ngā mahi hou me te āhuatanga hou kei ngā rōpū haka i te whakataetae-a-motu, arā Te Matatini me ētahi atu momo whakataetae i Aotearoa, tāpiri mai hoki ērā kei Te Moana nui a Kiwa. Ko te ingoa matua o tēnei tuhinga,  KAPA HAKA WHAKATAETAE. Kua tīni haere te kanohi o te mahi kapa haka i te ao hurihuri nei .
No reira, ko te tino pātai kei tēnei rangahau ko tērā. He aha ngā mahi hou kei te kapa haka whakataetae? Nā he hua anō hoki kei reira? Ka hāngaia tonu e te tuhinga nei  ngā hui whakataetae kapa haka mai i te tau 1972 tae noa ki te tau 2006.

Ngā ūpoko o te tuhinga whakapae
E whā ngā wāhanga ūpoko o tēnei tuhinga whakapae. Mā ngā ūpoko katoa ka kitea ai ngā momo kaupapa ake e hāngai pū ana ki te kaupapa mō te whakataetae kapa haka me ōna āhuatanga hou. He mahi whakahirahira tāku ki te whakatakoto i ngā kōrero, i ngā whakaaro, i ngā mātauranga o tēnā tangata mōhio, o tēnā tangata mātau ki roto i ngā whare māramatanga, arā ngā  wāhanga wēnā,  hei mātauranga hou mō te ao katoa.

I te ūpoko tuatahi, ka anga te titiro ki ngā whakamāramatanga o ngā tikanga-a-iwi e pā ana ki te  tūturutanga me te ao o te kapa haka. Mā wēnei whakamāramatanga hei awhi i a 'hau i taku rangahau ki te mahi onāianei o te whakataetae kapa haka. Ka whai mātauranga 'hau mō ngā tikanga o ngā kupu e rua. Ko ēnei ko te kupu  haka  te tuatahi, ā, ko te kupu  kapa haka  te tuarua. He aha ngā rerekētanga me te ōritenga o wēnei kupu rongonui? Ka anga whakamua ki ngā tūmanako me ngā ritenga o te whakataetae kapa haka a te motu mai i te New Zealand Polynesian Festival tae atu ki Te Matatini. Ko te whāinga mutunga o tēnei wāhanga, ka hoki whakanui ki te whakataetae-a-motu mai i te tau 1972 tae noa atu ki te tau 2006.

Ko te ūpoko tuarua, ka whakatakoto e 'hau ngā whakautu o ngā patapātai mai i ngā rārangi kōrero me ngā whakaaro whānui i whakahokia mai e ngā tāngata o ngā rōpū haka e whā, arā, Te Rōpū Haka o Te Kotahitanga, Ngāti Poneke Young Māori Club, ko Te Waihīrere, ā, huri atu ki Te Pou a Mangatāwhiri hoki, he rōpū i whakatūhia anō i te tau 2005. I tēnei wāhanga ka kitea ngā kōrero ātaahua, ngā mātauranga tūturu me ngā whakaaro hōhonu o ngā kaiako me ngā tāngata e tautoko ana i taku mahi kimi mātauranga.  Nā rātou ka ohorere, ka mirimiri hoki i tōku hinengaro ki ngā māramatanga hou. He tika anō te kupu ā  Pā Henare Tate nō Ngapuhi nui tonu e kī ana,  Mā te whakaatu, ka mōhio, mā te mōhio, ka mārama, mā te mārama, ka mātau, mā te mātau, ka ora   (Barlow 1991)

I te ūpoko tuatoru he whakaaturanga tēnei o āku tirohanga ki ngā āhua rerekē me ngā mahi hou i roto i ngā rōpū haka i runga i te ātamira o te whakataetae, i roto hoki i te mura o te ahi o te whakataetae. Kua tuhituhi au i ngā momo āhuatanga e pā ana ki  te taha o te kanikani, te mahi-a-korikori me ngā mahi katoa i runga i te atamira. Ahakoa iti ko tētahi atu wahanga o ērā kōrero e pā ana ki te pūoro me ōna mana kua puta i konei. Ka huri taku tuhinga ki te taha o te reo waiata, te toi whakaari me te whakaataata o ngā mahi a te Rēhia. I konei ka titiro ki te tāmoko, te pani kanohi me te pani tinana, arā he mahi hou katoa. Ko te wahanga mutunga e pā ana ki te reo Māori me te tito waiata hoki. Ahakoa he maha ngā āhuatanga, ko ngā tuhinga nei mō ia āhuatanga kia kitea ai ngā rerekēnga me ngā mahi hou i te whakataetae kapa haka o te ao Māori. No reira te nuinga engari ko wētahi i whakaurua mai i ētahi atu iwi ō tāwahi.       

Ko te ūpoko whakamutunga, ka hāngai taku titiro ki te ao o te whakataetae, arā, ki ngā whakaaro me te tā o te hinengaro me te ngākau o te tangata. Ka peka haere ki te whakatū o ngā rōpū whakataetae me te parakatihi o ngā waiata, ngā haka me ngā whakaritenga mo te whakataetae kapa haka. Ko te kōrero whakamutunga, ka huri ki wētahi atu o ngā whakataetae mai i Te Kuki Airani, i Tahiti me Hawaii hoki. Āe mārika, ka ora te ao o te whakataetae puta noa i te ao nui. Ki ahau, mā tēnei tuhinga hei whakapuare ngā hurihanga o te ao Māori me te ao o te kapa haka. Ka ea, he tika hoki te whakataukī rā,  ka pū te ruha, ka hao te rangatahi    (Ryan 1995), arā ka kimi i ērā e pīataata ai o rātou wairua, hinengaro, ngākau.

year: 2007